LIQUID DISCHARGE DEVICE

Abstract

The present invention refers to a device for the discharge of a pressurised liquid comprising: a liquid intake section (2400), a liquid discharge lance (2300), a pump (2200), which can be connected to a motor (2100), the pump having an inlet connected to the intake section and an outlet connected to the discharge lance, where the discharge lance and the pump are connected by a connection (2800, 2801, 2802, 2803, 2804), with at most three rotational degrees of freedom and/or one translational degree of freedom.

Claims

1. A device for the discharge of a pressurised liquid, comprising: a liquid intake section (2400), a liquid discharge lance (2300), a pump (2200), which can be connected to a motor (2100), the pump having an inlet connected to an intake section and an outlet connected to the discharge lance, wherein the discharge lance and the pump are connected by a connection (2800, 2801, 2802, 2803, 2804) which has at the most three rotational degrees of freedom and/or one translational degree of freedom, the device further comprising an outlet check valve (10254) with a first portion and a second position, wherein in the first position the outlet check valve is open, and wherein in the second position the outlet check valve can be opened if a pressure above a predetermined value is applied to its intake.

2. The device according to in claim 1 wherein the connection comprises a rotating joint (2800) and/or a spherical joint (2801) and/or a sliding joint (2802).

3. The device according to claim 1 wherein the connection comprises fastening elements (2803), preferably screws and/or adhesive and/or welds and/or bolts and/or rivets and/or an interlocking coupling (2804).

4. The device according to claim 1 wherein the pump, the lance and possibly the motor and/or transmission (2110) component nearest the pump are positioned substantially along a single axis of the device.

5. The device according to claim 1 wherein the device does not include a container (1007) for the liquid, and wherein the liquid intake section can be connected to a hose (2500).

6. The device according claim 1 wherein the motor comprises a motor body (6130), wherein the pump comprises a pump body (6270), and wherein the motor can be connected and/or removed from the pump by coupling and/or uncoupling it from the motor body and pump body.

7. The device according to claim 6, wherein the pump body and/or motor body comprises a locking device (7150, 7272) to prevent decoupling of the motor body from the pump body.

8. The device according to claim 1, further comprising a motor control device (9140) to control the power supplied by the motor.

9. The device according claim 1, further comprising a tank (11700) for a second liquid, preferably a liquid detergent or liquid for application to plants.

10. The device according to claim 9 wherein, in the usage position, the tank is positioned at least partially above or below a mixing section (11300, 12300, 13300).

11. The device according to claim 1, further comprising a motor.

12. The device according to claim 11 wherein the motor is a motor for multiple gardening tools, which can be separated from the pump.

13. The device according to claim 1, further comprising a liquid distribution duct (3411) which extends on the periphery of the pump.

14. The device according to claim 1, further comprising at least one intake valve (3250) and at least one outlet valve (3251), positioned radially in the pump.

15. (canceled)

Description

BRIEF DESCRIPTION OF THE FIGURES

[0033] The present invention will be clarified below via the description of some of its embodiments represented in the annexed drawings. It should nevertheless be noted that the present invention is not limited to the embodiments represented in the drawings; on the contrary, all variants or modifications of the embodiments represented and described herein which would appear clear, immediate and obvious to those in the field fall within the scope of the present invention. In particular, in the annexed drawings:

[0034] FIG. 1A illustrates a side view of a pressure washer according to the state of the art;

[0035] FIG. 1B illustrates a section view of the pressure washer shown in FIG. 1A;

[0036] FIGS. 2A-2C provide a schematic illustration of, respectively, a side view of devices for discharging a pressurised liquid, according to different embodiments of the present invention;

[0037] FIGS. 2D and 2E provide a schematic illustration of, respectively, a side view and a top view of devices for discharging a pressurised liquid, according to other embodiments of the present invention;

[0038] FIGS. 2F-2H provide a schematic illustration of, respectively, a side view of devices for discharging a pressurised liquid, according to different embodiments of the present invention;

[0039] FIG. 3A provides a schematic illustration of a section view of parts of a pump of a device for discharging a pressurised liquid, according to another embodiment of the present invention; FIGS. 3B and 3E provide a schematic illustration of section views of the pump illustrated in FIG. 3A;

[0040] FIGS. 4 and 5 provide a schematic illustration of a section view of parts of a pump of a device for discharging a pressurised liquid, according to other embodiments of the present invention;

[0041] FIG. 6A provides a schematic illustration of a section view of parts of a pump and a motor of a device for discharging a pressurised liquid, according to a further embodiment of the present invention; FIG. 6B provides a schematic illustration of a section view of the connection of the parts of the pump and motor illustrated in FIG. 6A;

[0042] FIGS. 7A and 7B provide a schematic illustration of a section view of the alignment and/or positioning and/or locking devices of the connection between the parts of a pump and a motor for a device for discharging a pressurised liquid, according to other embodiments of the present invention;

[0043] FIG. 8 provides a schematic illustration of a section view of parts of a device for discharging a pressurised liquid, with an integrated motor, according to a further embodiment of the present invention;

[0044] FIG. 9 provides a schematic illustration of a section view of parts of a device for discharging a pressurised liquid, with a motor control device and/or an integrated handle, according to a further embodiment of the present invention;

[0045] FIG. 10A provides a schematic illustration of a section view of parts of a discharge lance of a device for discharging a pressurised liquid, according to another embodiment of the present invention;

[0046] FIGS. 10B and 10C provide a schematic illustration of a section view of parts of a discharge check valve of a device for discharging a pressurised liquid, according to another embodiment of the present invention;

[0047] FIG. 11 provides a schematic illustration of a section view of parts of an additional tank of a device for discharging a pressurised liquid;

[0048] FIGS. 12 and 13 provide a schematic illustration of section views of parts of mixing control devices for the additional tank illustrated in FIG. 11, according to other embodiments of the present invention;

[0049] FIG. 14A provides a schematic illustration of a section view of parts of a configurable discharge lance of a device for discharging a pressurised liquid, according to another embodiment of the present invention; FIGS. 14B and 14C provide a schematic illustration of section views of the parts of the discharge lance illustrated in FIG. 14A;

[0050] FIGS. 15A and 15B provide a schematic illustration of two section views of a device for discharging a pressurised liquid, according to another embodiment of the present invention;

[0051] FIGS. 16A and 16B provide a schematic illustration of simplified three-dimensional exploded views of a device for discharging a pressurised liquid, according to another embodiment of the present invention;

[0052] FIG. 17 provides a schematic illustration of a possible operating scheme of a device for discharging a pressurised liquid, according to a further embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0053] Specific embodiments of the present invention shall now be discussed, with reference to the figures, in which the same reference numbers refer to the same elements. It shall nevertheless be clear that the present invention is not limited to the embodiments illustrated and/or described below. Each embodiment defined by the claims shall be considered part of the present invention.

[0054] FIG. 2A provides a schematic illustration of a side view of a device for discharging a pressurised liquid 2000, according to a embodiment of the present invention.

[0055] The device for discharging a pressurised liquid 2000 comprises a liquid intake section 2400, a liquid discharge lance 2300 and a pump 2200. The device 2000 can be connected to a motor 2100. In the illustrated embodiment, the motor 2100 is present and connected to the pump 2200; it shall nevertheless be clear that the present invention may also be implemented without the motor 2100, simply with the provision for the device 2000 to be connected to a motor 2100. Embodiments with integrated motor 2100 or with a motor 2100 which can be connected and/or disconnected shall be described below.

[0056] The device 2000 has an inlet connected to the intake section 2400 and an outlet connected to the discharge lance 2300. In this manner, the device 2000 is able to pressurise a liquid taken in by the intake section 2400 and discharge it from the discharge lance 2300, creating a jet 1005. As can be seen in the figure, the discharge lance 2300 and the pump 2200 are connected in a substantially solid manner.

[0057] A substantially solid manner shall mean, in some embodiments, a connection with only rotational degrees of freedom, specifically a maximum of three rotational degrees of freedom, preferably a maximum of two rotational degrees of freedom, and ideally a maximum of one rotational degree of freedom.

[0058] A connection with a maximum of one rotational degree of freedom is illustrated as an example in FIG. 2C. Specifically, a rotating joint 2800 allows the lance 2300 to rotate around its longitudinal axis with respect to the pump body 2200, as shown schematically by the arrow. Alternatively, or in addition, a connection with a maximum of one rotational degree of freedom is illustrated as an example in FIG. 2C. Specifically, a spherical joint 2801 allows the lance 2300 to rotate around the Z axis, as shown schematically by the arrow, possibly within a predefined angle. Alternatively, or in addition, a connection with a maximum of one rotational degree of freedom is illustrated as an example in FIG. 2D. Specifically, a spherical joint 2801 allows the lance 2300 to rotate around the Y axis, as shown schematically by the arrow, possibly within a predefined angle.

[0059] Alternatively, or in addition, a connection with a maximum of two rotational degrees of freedom is illustrated as an example in FIGS. 2D and 2E. Specifically, the spherical joint allows rotation both around the Y and Z axes. In this manner the discharge lance 2300 can be oriented in the required direction, within a spherical range limited by a predefined angle, while still keeping the pump and lance joined together in a substantially solid manner.

[0060] The predefined angle may be between −45° and 45°, preferably between −30° and 30°, and still more preferably between −15° and 15°, with respect to the axis of longitudinal extension of the device 2000, corresponding to the X axis in the figure.

[0061] Alternatively, or in addition, a connection with a maximum of two or three degrees of rotational freedom may be obtained by combining one or more of the previously described embodiments.

[0062] Alternatively, or in addition, in some embodiments a substantially solid manner may mean a connection with a maximum of one degree of translational freedom, specifically along the axis of extension of the lance 2300, such as to allow the lance to possibly retract, at least partially, inside the pump body. This connection is illustrated in FIG. 2F, where the sliding joint 2802 allows the lance 2300 to perform a translational motion along its longitudinal axis with respect to the pump body 2200, as shown schematically by the arrow. This type of connection may be combined with the connections with one, two, or three degrees of rotational freedom described above.

[0063] The connections described differ from the flexible hose typical of prior art. Indeed, while permitting a certain amount of movement between the lance 2300 and the pump 2200, they allow portable use of the device 2000, for example with one hand on the pump 2200 and one on the lance 2300. The hose, on the contrary, makes a connection which has various translational degrees of freedom, which makes portable use of known devices inconvenient or impossible.

[0064] Alternatively, or in addition, in other embodiments, a substantially solid manner may also be taken to mean a fixed connection between the lance and pump which prevents movement of the discharge lance 2300 with respect to the pump 2200. In other words, a connection with zero degrees of rotational and translational freedom. For example a connection fastened by retaining elements 2803, as illustrated in FIG. 2G, for example screws and/or adhesive and/or welds and/or bolts and/or rivets between the body of the pump 2200 and the body of the lance 2300. As another alternative, or in addition, an interlocking connection 2804 between the two bodies, illustrated schematically in FIG. 2H, can create a connection with zero degrees of rotational and translational freedom.

[0065] Alternatively, or in addition, in some embodiments, each connection in which the lance 2300 and the pump 2200 are not connected by a long hose, as is the case for prior art, may be considered a substantially solid manner, in contrast to the completely flexible connection offered by the long hose 1003 used to connect the lance 1004 to the body 1001 of the pressure washer which represents the state of the art.

[0066] FIG. 2B provides a schematic illustration of a side view of a device for discharging a pressurised liquid 2000, according to another embodiment of the present invention

[0067] Specifically, the device in FIG. 2B differs from that in FIG. 2A due to the presence of a transmission 2110 between the device 2000 and the motor 2100. The transmission may be of any type, for example a universal joint, via a rotating axle, chain, belt, reduction unit etc. In general, any mechanical transmission allowing power to be transferred from the motor 2100 to the pump 2200 may be implemented.

[0068] As is visible, for example, in FIGS. 2A and 2B, the liquid discharge device 2000 shown in the illustrated embodiments differs from the known device 1000 as there is not a flexible connection between the pump 2200 and lance 2300. On the contrary, these two elements are connected in a substantially solid manner, as previously described. In addition, in some embodiments a motor 2100 may be included in the device 2000, also connected in a substantially solid manner to the pump 2200, possibly via a transmission 2110.

[0069] Thanks to the embodiments described above, it is possible to implement a device for the discharge of a pressurised liquid comprising: a liquid intake section 2400, a liquid discharge lance 2300, a pump 2200, which can be connected to a motor 2100, the pump having an inlet connected to the intake section and an outlet connected to the discharge lance, where the discharge lance and the pump are connected by a connection 2800, 2801, 2802, 2803, 2804, with at most three rotational degrees of freedom and/or one translational degree of freedom.

[0070] The liquid discharge device 2000 may therefore be handled as a single component by the user, for example by holding it in two hands. For example, a first and second grip may be provided by any one or two elements between the lance 2300, the pump 2200, the motor 2100 and/or the transmission 2110. As an example, FIG. 17 shows a grip with both hands on the transmission. As a further example, the user's left hand in FIG. 17 could grip the pump or the lance. Handles to facilitate the grip could be implemented on any one of the elements described, as described below. Alternatively, or in addition, a shoulder strap may be used to support the weight of the device 2000 while the handgrip is used to direct the device 2000, or the lance 2300 in the event that this is partially mobile with respect to the pump 2200.

[0071] Such use of the device 2000 for discharging liquids is even more advantageous if the size and weight are minimised. This result is obtained thanks to the presence of the intake section 2400. Specifically, the intake section 2400 allows the intake of the liquid discharged by the device 2000, for example water. More specifically, the section 2400 allows connection of a pipe 2500, which may be a flexible hose, the other end of which may then be connected to a liquid supply, for example a tap or container. In this manner the user does not need to carry the liquid container 1007 with him since the pipe 2500 allows the user to operate the device 2000 within a certain radius of the liquid source. It is therefore possible to create a device 2000 for discharging liquid without the presence of a tank 1007 for the liquid, which is, on the contrary, present in prior art. The device 2000 thus features particularly advantageous operation in comparison to such prior art. It is possible, for example, to have a device 2000 operating as a pressure washer/sprayer in proximity to any water source, for example a tap, a container, a swimming pool etc. With the motor 2100 specified as a battery-powered motor or internal combustion engine, the flexibility of use of the device 2000 is further increased. Activities such as cleaning a vehicle, cleaning the border of a swimming pool, irrigating and spraying garden beds, vegetable patches etc. will benefit from the ease of transport and/or use of the device 2000, thanks to the lack of the internal tank 1007 and thanks to the possibility to handle the device 2000 in an extremely flexible and manageable manner.

[0072] Furthermore, as illustrated, the pump, the lance and possibly the motor and/or part of a transmission 2110 nearest the pump in the device 2000 are positioned substantially along a single axis of the device, possibly the same axis as the extension of the lance 2300. This design lends particular manageability to the device 2000, since the compact nature and longitudinal extension of its structure allow a considerable reduction in weight and thus allow a greater degree of freedom in its movement during use. In some embodiments, the transmission may be flexible, for example in the case of a motor 2100 carried on the user's shoulder and connected by a flexible transmission 2110 to the pump 2200. In such embodiments, it will be sufficient for the end of the transmission 2110 on the pump 2200 side to be aligned with the pump 2200, and not the entire transmission 2110.

[0073] Specific embodiments for some components of the device 2000 are described below. It should be highlighted that such embodiments should be considered examples, and that alternative embodiments may be created. It shall also be clear that components from different embodiments may be combined.

[0074] FIG. 3A provides a schematic illustration of a section view of parts of a pump 3200 for a device for discharging a pressurised liquid 2000, according to an embodiment of the present invention. FIGS. 3B-3E provide a schematic illustration of section views of the pump illustrated in FIG. 3A, taken along the ZY plane passing through the section lines B, C, D and E illustrated in FIG. 3A, respectively. The pump 3200 represents a possible embodiment of the pump 2200, with the advantages described below. It shall nevertheless be clear that, in some embodiments, any pump 2200 may be used.

[0075] The pump 3200 comprises a cam 3210, comprising an input shaft 3211 and having an inclined asymmetric plate 3212. As can be seen, as the input shaft 3211 rotates, the asymmetrical surface of the asymmetric inclined plate 3212 alternately and continuously interspaces the maximum and minimum thickness position of the plate 3212 itself. The rotation of the cam 3210 can be facilitated by the presence of bearings 3213. The alternating movement of the asymmetric inclined plate 3212 causes the piston 3220 to move along the X axis, as shown by the arrow A, inside a cylinder 3230. While the cam 3210 causes the movement in the positive X direction, the movement in the negative X direction can be ensured by an elastic element 3221, for example a spring. Alternatively, or in addition, the movement in the negative X direction can be obtained from the pressure of the liquid, in the event that the liquid is taken from a source which is under pressure, for example a tap.

[0076] Although not illustrated, the asymmetric inclined plate 3212 may have more than one section of minimum thickness and one of maximum thickness within a 360-degree arc. In this manner it will be possible to move the piston 3220 multiple times with a single rotation of the asymmetric inclined plate 3212, thus providing an advantageous reduction in the number of rotations required of the motor. In addition, or alternatively, in some embodiments, by introducing a plurality of sections of minimum and maximum thickness within the 360-degree arc, it will also be possible to make the piston smaller, as it will be actuated multiple times during a single rotation of the asymmetric inclined plate 3212, thus making the pump 3200 more compact.

[0077] The liquid from the intake section 2400 moves through an intake line 3410 until it reaches a distribution duct 3411, in which the liquid travels from the lower to the upper part of the pump 3200, as shown in FIG. 3C. The distribution duct 3411 extends to the outside of the pump body. This characteristic not only allows the liquid to be distributed from one side of the pump body to the other, but also provides uniform cooling of the pump body. In some embodiments, the dimension along the X axis of the distribution duct 3411 may be increased as required with respect to the illustrated embodiment, in order to provide an advantageous increase in cooling.

[0078] From the distribution duct 3411, the liquid then flows through an intake valve 3250 which may be, for example, a check valve, a mechanically or hydraulically controlled valve, or any type of valve which allows the entry of the liquid into the compression chamber 3240 during the intake phase and prevents it from coming out during the compression phase. Following the compression performed by the piston 3220, the liquid is pushed out of the compression chamber 3240 through an outlet valve 3251 which may be, for example, a check valve, a mechanically or hydraulically controlled valve, or any type of valve which allows the outlet of the liquid from the compression chamber 3240 during the compression phase and prevents it from coming in during the intake phase. Once it has exited the compression chamber 3240, the pressurised liquid finds itself in an outlet chamber 3260 with at least one outlet opening 3261 which allows the pressurised liquid to be transferred to the lance 2300, if necessary after passing through other elements which will be described below.

[0079] As can be seen in FIG. 3D, the valves 3250 and 3251 are radially positioned in the body of the pump 3200. This allows better management of the pressure generated in the compression chamber 3240. In general, as a matter of fact, as the two valves 3250, 3251 are arranged radially, the pressure exerted by the liquid on the valves 3250, 3251 tends to push the valves in a radial direction. If the valves were instead arranged longitudinally, along the X axis, for example, the thrust applied by the pressurised liquid would be along this direction. The fact that the thrust on the two valves 3250, 3251 is in the radial direction facilitates the construction of the pump. Specifically, this arrangement prevents the pressure on the valves pushing them in the direction of the lance 2300, which would require a particularly thick support surface between the pump and the lance in order to prevent deformation. On the contrary, with the two valves being pushed in a radial direction, the support surface of the valves 3250, 3251 can be provided by substantially radial ribs 3253 on which the valves 3250, 3251 rest. Alternatively, or in addition, the radial positioning of the valves 3250, 3251 allows the dimensions of the pump 3200 to be reduced, particularly in the X direction. Moreover, the radial positioning of the two valves allows a star configuration to be implemented when a plurality of pistons 3320 are used, in which the intake valves 3250 take on an advantageous radial positioning in connection with the ring formed by the distribution duct 3411, and/or the outlet valves 3251 take on an advantageous radial positioning in connection with the outlet chamber 3260.

[0080] In addition, in some embodiments, it will be possible to connect a safety valve 3252 to the outlet chamber 3260. In so doing, it is possible to ensure that, in the presence, for example, of blockages along the lance 2300, the pump 3200 is not blocked and/or excessive liquid pressure is avoided. The safety valve 3252, for example a check valve with opening pressure slightly greater than the maximum operating pressure of the pump, can discharge both outside the pump 3200 and, as shown, into a return line 3412 connected to the distribution duct 3411 and/or the intake line 3410.

[0081] Via the described pump 3200 it is possible to pressurise the liquid taken in by the intake section 2400. Specifically, it is both possible to increase the pressure of a liquid taken from, for example, a tap, and to pump and pressurise a liquid from a container which is not under pressure, for example a swimming pool, a tank etc.

[0082] The pump 3200 is particularly advantageous as it allows the use of rotational motion from the input shaft 3211, thus simplifying the coupling of the pump 3200 with a motor 2100, positioned substantially along the X direction with respect to the pump and/or as it provides an outlet to the liquid under pressure also substantially along the X axis with respect to the pump. In other words, the pump 3200 allows the lance 2300 and the motor 2100 to be connected in the same direction, such as to extend the device 2000 essentially along the X axis. Alternatively, or in addition, it is sufficient for the power take off on the motor 2100 to be essentially in line with the input shaft 3211, in order to facilitate coupling of the two elements. In some cases, for example, the motor 2100 could be carried on the operator's shoulder and the transmission to the device 2000 could be flexible.

[0083] As previously described, the present invention is not limited to this embodiment and any pump capable of pressurising a liquid present in or which can be drawn by the intake section 2400 via suction can be used to implement the pump 2200. Possible additions and/or alternatives to the pump 3200 are, for example, illustrated in FIGS. 4 and 5.

[0084] FIG. 4 provides a schematic illustration of a section view of parts of a pump 4200. The pump 4200 differs from the pump 3200 in the cam 4210 which replaces the cam 3210. The cam 4210 differs specifically due to the presence of a rolling element 4220, for example a bearing or rollers, in the region of the asymmetric inclined plate 4212 in contact with the piston 3200. In this manner it is possible to reduce operational frictions. Alternatively, or in addition, it will be possible to apply the rolling element 4220 to the piston 3220. This latter solution is particularly advantageous in the event that the asymmetric inclined plate 4212 does not have a flat surface, for example in the presence of a plurality of sections of minimum thickness and sections of maximum thickness within the 360-degree arc.

[0085] FIG. 5 provides a schematic illustration of a section view of parts of a pump 5200. The pump 5200 differs from the pump 3200 due to the presence of three pistons 5220A-C instead of a single piston 3220. The number of pistons, three in the example, which can be implemented is not limited. It shall also be clear that the characteristics of the pumps 3200 and/or 4200 and/or 5200 may, in some embodiments, be combined.

[0086] FIG. 6A provides a schematic illustration of a section view of parts of a device 2000 and a motor 2100 for discharging a pressurised liquid. As can be seen in the figure, the device 2000 has a pump body 6270 open on the side of the input shaft 3211. The motor 6100, which represents a possible embodiment of the motor 2100, has an output shaft 6120 and a motor body 6130 open on the side of the output shaft 6120. In this manner the device 2000 and the motor 6100 can be connected, as shown in FIG. 6B, or disconnected, as illustrated in FIG. 6A, by coupling and decoupling the motor body 6130 and the pump body 6270, resulting in coupling and decoupling of the output shaft 6120 and input shaft 3211. The input and output shafts 6120, 3211, may be shaped in various manners, with complementary shapes, in order to allow transmission of power from the motor 2100 to the pump 2200.

[0087] The coupling and decoupling described allow, for example, a motor or engine for multiple gardening tools to be used as the motor 6100, for example the motor for a chainsaw, a string trimmer, a leaf blower, or other gardening/DIY tools. More generally, the coupling and decoupling described allow the connection of any motor able to be connected to the pump body and transmit power to the input shaft. This makes the device 2000 particularly low cost, as it can be manufactured and sold without a dedicated motor, as part of a set of DIY/gardening tools which share a single electric motor or internal-combustion engine.

[0088] To avoid accidental uncoupling of the motor body 6130 from the pump body 6270, various locking systems are available, two of which are shown as an example in FIGS. 7A and 7B. Specifically, FIGS. 7A and 7B provide a schematic illustration of a section view of parts of devices for locking the connection between the pump and the motor of a device for discharging a pressurised liquid. FIG. 7A provides a schematic illustration of a device for aligning and/or positioning and/or locking 7272, for example a button, held in position by an elastic device 7271, for example a spring. The locking device is solidly affixed to the pump body 7270 and extends through a dedicated hole in the engine body 7130, or vice versa. In this manner it is possible to ensure that the coupling of the pump body 7270 and the motor body 7130 is locked. In addition, or alternatively, a locking device 7150, for example a ring positioned around the outermost of the motor body and pump body 7130, 7270, allows the locking device to be squeezed tight, for example via a screw (not shown), preventing the two bodies from sliding against each other due to the friction generated by the locking device 7150. These embodiments shall be considered non-binding examples of how a reliable coupling between the motor 2100 and device 2000 can be obtained, in the event that the motor can be coupled to and uncoupled from the device 2000 for discharging pressurised liquid.

[0089] In the two examples illustrated, the parts of the motor body 7130 and the pump body 7270 which are joined together represent a possible embodiment of the transmission 2110. It shall also be clear that the transmission 2110, in some embodiments, may advantageously be longer than that illustrated, particularly along the X axis, thus moving the motor 2100 away from the device 2000.

[0090] In some embodiments, the motor 2100 may be an integral part of the device 2000 for discharging a pressurised liquid, as illustrated for example in FIG. 8 where the motor 2100 is enclosed inside the pump body 8270.

[0091] In both cases, whether the motor 2100 can or cannot be separated from the device 2000, it is possible to include a motor control device 9140 in the device 2000, in the motor 2100 or in the transmission 2210, as illustrated schematically in FIG. 9. This allows the discharge power of the liquid to be controlled, from a minimum value, which can even be zero, to a maximum value, by directly controlling the motor power. This solution provides various advantages. Firstly, the motor does not operate when pressure is not requested, reducing power consumption. In addition, there is no risk of leaks due to internal liquid pressure which cannot find an outlet. Furthermore, while the modulation of a liquid under pressure is generally difficult to control, and requires a certain pressure on the modulation device by the user, the operation of a motor control device 9140, for example a potentiometer connected to a button, or else a throttle control for an internal combustion engine, does not require any effort and can be easily modulated. It should be clear that, in the case of a motor 2100 which can be decoupled from the device 2000, it will be possible to implement the control device 9140 on the device 2000 and/or on the motor 2100, where necessary by providing for an electrical or mechanical connection between the device 2000 and the motor 2100 to transfer the control movement and/or signal. In other embodiments, it will be possible to directly modulate the discharge of the liquid. Despite the disadvantages listed above, this solution has the advantage of being easier and more economical to implement.

[0092] In FIG. 9, a handle 9600 in addition or in alternative is illustrated which facilitates the grip on the device 2000. For example, the device could be gripped with one hand on the handle 9600 and one hand on the lance 2300, or on a handle (not shown) installed in the area of the lance 2300.

[0093] After the liquid has been pressurised, it can be discharged directly by a lance 2300, or it can pass through a mixing section and/or an outlet check valve. These elements shall be described with reference to FIGS. 10 and 14.

[0094] Specifically, FIG. 10A illustrates a schematic section view of parts of a discharge lance 2300 comprising a discharge nozzle 2310. In the simplest embodiment, the lance 2300 is essentially a tubular element with one end connected to the outlet 3261 of the pump 3200 and the other end holding the discharge nozzle 2310. The extension along the X axis allows the jet 1005 to be oriented. The specific form of the nozzle 2310 allows the form of the jet 1005 to be controlled, in a manner known from prior art.

[0095] Alternatively, or in addition, as shown in FIG. 10A, it is possible to insert an outlet check valve 10254 downline of the outlet opening 3261. In an initial embodiment, the outlet check valve 10254 is normally closed and has an opening pressure greater than that of a pressurised liquid supply, for example from a tap, for example of 3 or 4 bar. When the device is connected to a pressurised source, a pressure increase can be obtained from the pump 2200, which therefore opens the outlet check valve 10254. On the contrary, when the pump 2200 is not operating, the pressure of the supply will not be enough to open the outlet check valve 10254, thus preventing the simple pressure of the liquid supply causing it to flow out uncontrolled from the lance 2300. In some embodiments of the invention the outlet check valve 10254 described above may also be used instead of the outlet valve 3251.

[0096] In an alternative embodiment, illustrated in FIGS. 10B and 100, the outlet check valve 10254 has different operating positions, which can be set via a control lever 10256. Specifically, when the control lever is in the position shown in FIG. 10B, an eccentric element 10258 positioned on its upper edge acts on a shutter 10257, pushing it in the positive direction of the X axis against the force exerted by the elastic device 10255, for example a spring. In this position, valve 10254 is open. This configuration can be used, for example, in liquid suction mode, in which the liquid supply is not under pressure. In this mode there are no losses of power and reactivity due to the necessary opening of the pump. Furthermore, in this mode it is also possible to discharge liquids at low pressure. Finally, opening of the valve 10254 makes it possible for the pump to draw liquid via suction. As illustrated in FIG. 10C, if the lever 10256 is moved in the opposite direction, the eccentric element 10258 allows the shutter 10257 to move in the negative direction along the X axis, under the thrust provided by the elastic element 10255. In this position the valve 10254 is closed and held in position by the elastic element 10255. This configuration can, for example, be used in the case that the liquid supply is taken from a pressurised source. In this case, the thrust of the elastic element 10255 may be calibrated to prevent the liquid from opening the valve under the pressure provided by the source, but to allow the liquid to open the valve under the pressure provided by the pump 2200. In this manner, an undesired outflow of the liquid is prevented when the user does not operate the pump 2200. Although the valve 10254 has been shown as operated by a lever 10256 and an eccentric element 10258, it should be clarified that other embodiments making use of, for example, levers, cams, thrust screws and so on may be used as an alternative.

[0097] In the embodiment shown in FIG. 10A, the lance 2300 is directly connected to the outlet of the pump 2200, possibly via the outlet check valve 10254. In other embodiments, the lance 2300 may be installed downline of a mixing section 11300, 12300, 13300, which may be incorporated in the body of the pump 2200, as described below. Although not illustrated, for clarity it should be specified that the outlet check valve 10254 may be incorporated in any described embodiment, in particular upline or downline of the mixing section. In these embodiments it shall therefore be understood that the connection between the pump 2200 and the lance 2300, made in a substantially solid manner, is downline of the mixing section and/or the outlet check valve 10254.

[0098] The mixing section 11300 in FIG. 11 comprises a mixing hole 11710, communicating with a liquid 11720 contained in a tank 11700. The liquid 11720 is not the liquid pressurised by the device 2000. For example, the liquid pressurised by the device 2000 may be water, while the liquid 11720 may be a detergent, in the case of a pressure washer, or a fertiliser in the case of a sprayer, or more generally a liquid for use with plants, for example a weedkiller or fertiliser. The mixing hole 11710 allows the pressurised liquid, for example water, to be mixed with the liquid 11720 inside the mixing section 11300.

[0099] The tank 11700 may be positioned substantially above the mixing section 11300, as illustrated, and/or above the entire pump 2200 as shown for example in FIG. 15, and/or above the lance 2300. This flexibility of positioning allows the weight of the device 2000 to be balanced. In other embodiments, the tank 11700 may be positioned anywhere in the device 2000 and may be connected to the mixing hole 11710 via a dedicated line. Moreover, as illustrated, the tank 11700 may be structurally integrated in the pump body, or it may be an element which can be separated and connected to the pump body, as shown for example in FIG. 16.

[0100] The mixing section 12300 in FIG. 12 differs from the mixing section 11300 in that the mixing hole 12710 is shaped in such a way as to work in tandem with a mixing control device 12730. In the illustrated embodiment, the mixing control device is a pin control with a substantially conical section, which can be inserted inside the hole 12710 to a controlled depth on the basis of the movement provided by the rotation of a threaded knob or similar. In this manner it is possible to control the quantity of liquid 11720, from zero to maximum, mixed with the pressurised outlet liquid.

[0101] In the two embodiments of the mixing section 11300, 12300, the mixing occurs by simple gravity feed of the liquid 11720 through the hole 11710, 12710. This operation is possible in the case that the pressure inside the mixing section 11300, 12300 is not too high, for example in the case that the device 2000 is used as a low-pressure sprayer. In high-pressure situations, however, the mixing is prevented by the tendency of the pressurised liquid to enter the tank 11700. FIG. 13 provides a schematic illustration of a solution which allows mixing even in the case of high-pressure discharge.

[0102] Specifically, the mixing section 13300 illustrated in FIG. 13 differs from the mixing section 12300 due to the presence of a Venturi tube 13320. The narrowing of the Venturi tube causes a localised pressure drop at the mixing hole, which allows the liquid 11720 to be mixed even in the presence of high pressure in the mixing section 13300. In other embodiments, given that the mixing is performed by the effect of the pressure drop generated by the Venturi tube 13320, it will be possible to position the tank 11700 below the mixing section 13300 as well. In addition, in some embodiments, the mixing section 13300 may include a valve 13330. The valve 13330 is illustrated schematically in the figure as a ball valve, possibly held in position by an elastic element; in any case, all embodiments of a check valve for the liquid 11720 will be possible. In the presence of the valve 13330, the mixing section 13300 will allow mixing of the liquid 11720 in low-pressure mode, for example for low-pressure washing in pressure-washer mode. When switched to high-pressure mode, valve 13330 closes, blocking mixing and preventing entry of the pressurised liquid into the tank 11700. It will also be possible to implement a mixing hole without any non-return valve.

[0103] As previously described, the mixing sections 11300, 12300, 13300 will be advantageously incorporated in the body of the pump 2200. In possible variants of the present invention, in any case, the mixing sections 11300, 12300, 13300 may also be incorporated in the body of the lance 2300, where necessary by moving the tank 11700 onto the body of the lance 2300 and/or incorporating it in the same. As another alternative, the tank 11700 may be positioned on, or incorporated in, the body of the pump 2200 and connected via a hose to a mixing section 11300, 12300, 13300 implemented in the lance 2300, or vice versa. It should also be clarified that the lance 2300 in FIGS. 10-13 is schematically illustrated as structurally connected to the body of the pump and/or the mixing section 11300, 12300, 13300. This representation is provided purely as an example, and the connection of the lance 2300 to these elements may be performed with screws, by interlocking coupling in a dedicated seat, or with joints, for example one of the unions 2800. 2801 described above.

[0104] FIG. 14A illustrates a schematic section view of parts of a configurable discharge lance 14300 for a device 2000. FIGS. 14B and 14C illustrate schematic section views of the discharge lance shown in FIG. 14A according to the section lines B and C. The lance 14300 has a plurality of discharge nozzles 14310, 14311, for example a low-pressure nozzle 14310 and a high-pressure nozzle 14311. The choice of the various nozzles can be made by rotating a mobile part 14350, on which the nozzles are installed, against a fixed part 14340, connected to the pump 2200, as in the case of the lance 2300. In some optional embodiments, movement of the mobile part 14350 against the fixed part 14340 can be facilitated by one or more rotational elements 14360, for example bearings or simple rings, even solid ones. The fixed part contains an opening 14341 on the side of the pressurised liquid discharge, on which one of the openings 14351A, 14351B of the mobile part 14350 can be alternately positioned. In this manner it is possible to choose which discharge nozzle to use. The various discharge nozzles may have known forms for controlling the type of discharge required. In the illustrated embodiment, as an example, the high-pressure nozzle 14311 has a smaller discharge opening in comparison to the low-pressure nozzle 14310. In this manner, for example, it is possible to control the outlet pressure even with a pump able to operate only at a single speed.

[0105] It is then described how different embodiments can be performed and, where necessary, combined, in order to create a pressurised liquid discharge device 2000, for example a pressure washer and/or sprayer, with facilitated use and/or lower weight and/or lower cost.

[0106] As described, in some embodiments the device 2000 can be fitted with a mechanical device which can be adapted to external power generators such as, by way of non-limiting example, electric or petrol string trimmers, electric motors or internal combustion engines in general, or any type of power take off available, for example tractors, farm machinery etc. In addition, or as an alternative, in some embodiments the device may be equipped with a multi-way discharge lance, which it may be possible to select according to the required use. In addition, or as an alternative, in some embodiments the device may be equipped with a tank in which various types of substances such as detergents or various other chemical products can be held to be discharged by the lance together with the pressurised liquid (e.g. water). The supply of the liquid, for example water, can be assured, in the event of necessity, by drawing via suction from an available nearby water source, for example a generic irrigation channel or siphon, as shown in FIG. 17.

[0107] Further possible embodiments of the device 2000 shall be described in relation to FIGS. 15-17. Specifically, FIG. 15A illustrates a schematic section view along the XY plane of a further possible embodiment of the device 2000, according to an embodiment of the present invention. FIG. 15B illustrates a schematic section view along the ZY plane taken along the line A-A of FIG. 15A. FIGS. 16A and 16B illustrate simplified schematic three-dimensional exploded views of the main components of the device 15000. FIG. 17 represents a possible operating scheme with the water supply drawn via suction by the device in FIG. 15 or FIGS. 16A, 16B.

[0108] The device illustrated in FIG. 15 comprises a connection for the liquid (generally water) supply line, a pressure generator, possibly high pressure, and in some embodiments a liquid tank. The liquid tank may be firmly attached to the tank and/or a lance, possibly multi-way, from which a liquid jet used for the purpose of the device is discharged. As partly completed machinery, it is able to provide a very specific application simply by applying an external power source supplied, for example, by the motor of a string trimmer through the rotational motion of an element inside the stem appropriately fitted with a joint to house other partly completed machinery and provide other very specific applications.

[0109] Specifically, the device in FIG. 15 comprises, or is composed of, a main shaft 15001, similar to the input shaft 3211 which is connected to the power take off on the energy source 15035, which could be, for example, the output shaft 6120, mounted on bearings 15002, similar to the bearings 3213, rolling or sliding. This shaft 15001 is rigidly connected to an inclined disc rotor 15003, similar to the cam 3210, supported by an axial bearing 15004, rolling or sliding, with the function of transforming the rotary motion of the main shaft 15001 into linear motion of one or more pistons 15005, similar to the piston 3220.

[0110] These pistons 15005 are moved during the active phase by the inclined disc rotor 15003 via an axial bearing 15006, similar to the rolling element 4220, rolling or sliding, and during the return phase by springs 15007 connected to it via circlips 15008, where the springs 15007 and circlips 15008 perform a function similar to that of the elastic device 3221. The pistons 15005 are housed inside guides 15009, similar to the cylinder 3230, and slide on gaskets 15010 required to keep the lubricant inside the pump body 15011, similar to the pump body 6270, 7270 or 8270. Each piston 15005 acts in the compression chamber 15012, in which liquid leakage is prevented by gaskets 15013, and each of them is connected to a check valve 15014, similar to the intake valve 3250, which regulates the intake phase, and a check valve 15015, similar to the outlet valve 3251, which regulates the outlet phase. The intake check valve 15014 is connected to the intake circuit 15016, with a function similar to the ducts 3410 and 3411, to which the water supply line 15017, similar to the hose 2500, is connected from the mains water supply or a tank.

[0111] The outlet check valve 15015 is connected to the outlet circuit 15018, similar to the outlet chamber 3260, and to the four-function washing lance 15019, with operation similar to the lance 14300. During the intake phase, in other words the return of the pistons 15005 due to the effect of the springs 15007, the liquid enters the compression chamber 15012 through the intake check valves 15014. During the outlet phase, in other words the forward stroke of the pistons 15005 caused by the action of the inclined disc 15003 rotor 15001, the liquid is driven into the compression chamber 15012 and then enters the outlet circuit 15018 through the outlet check valves 15015. After entering the outlet circuit 15018, the liquid passes through a Venturi tube 15020, similar to the Venturi tube 13320, connected to the detergent or chemical additive tank 15022 similar to the tank 11700, possibly via a check valve 15026, similar to the valve 13330, which prevents water entering the tank 15022 when operating under high pressure, while allowing mixing in low-pressure operation.

[0112] By selecting the low-pressure nozzle 15023 on the washing lance 15019, the Venturi tube 15020 generates a pressure drop in the detergent tank 15022 which causes the detergent to mix with the wash liquid, in a quantity which can be regulated via the adjustment screw 15024 with a function similar to that of the mixing control device 12730. The detergent tank 15022 is fitted with a filler cap 15025 with a vent hole or check valve to allow it to equalise with atmospheric pressure and ensure a regular flow of the detergent or chemical additive.

[0113] Upline of the Venturi tube 15020 is an outlet check valve 15021, similar to the outlet check valve 10254, which prevents the leakage of water from the washing nozzles 15023, 15027, 15028, 15029 of the washing lance 15019 when connected to the mains water supply and the power supply is disconnected. Downline of the Venturi tube 15020 the water reaches the distributor disc 15031 via the central line 15030.

[0114] Rotating the washing lance 15019 connects one of the four ducts of the nozzles body 15032 via seal rings 15033. At the end of each of the ducts on the nozzles body 15032 the washing nozzles 15023, 15027, 15028, 15029 are attached; these have different characteristics, specifically the low-pressure fan jet nozzle 15023, similar to nozzle 14310, the high-pressure narrow-angle nozzle 15027, similar to nozzle 14311, the high-pressure fan jet nozzle 15028 and the rotating high-pressure nozzle with a conical jet 15029. The washing lance 15019 is fitted with a spring device 15036 able to recognise and correctly position the nozzles body 15032 with the ducts perfectly aligned with the distributor disc 15031. Connected between the outlet circuit 15018 and intake circuit 15016 is a safety valve 15034, similar to the safety valve 3252, to prevent any damage due to unexpected overpressures.

[0115] Moreover, an embodiment of the present invention can refer to an interchangeable device equipped with a high-pressure pump unit 16002, with a function similar to the pump 2200, water intake 16003, with a function similar to the intake section 2400, liquid tank 16004, with a function similar to the tank 11700, lance 16005, with a function similar to the lance 2300 and embodiment similar to the lance 14300 and/or the lance 15019, characterised in that it is equipped with a connection system comprising or composed of shaped shaft coupling 16001, similar to the end of the pump body 6270 on the motor side, and shaped hub 16007, with a function similar to the output shaft 6120, an anti-rotation positioning element 16008, with a function similar to the alignment and/or positioning and/or locking device 7272, a locking clamp 16009, with a function similar to the locking device 7150, which permits the coupling to a power generator of various type 16006, with a function similar to the motor 2100 or transmission 2110, transforming the whole assembly into a pressure washer and or (high-pressure) sprayer.

[0116] A further embodiment may refer to a device according to the previous embodiment, characterised by the fact that the multi-way lance has no flexible hose and is directly connected to a structure composed of a connection for the water line 16003, high-pressure generator 16002 and liquid tank 16004.

[0117] A further embodiment may refer to a device according to one of the two previous embodiments, characterised by the fact that the water supply 16003 may also be provided by drawing via suction from generally available water by the vacuum generated in the compression chamber of the pump assembly 16002.

[0118] A further embodiment may refer to a device according to one of the previous embodiments, characterised by the fact that its operation depends on a single fixed connection comprising only the water supply.

[0119] A further embodiment may refer to a device according to one of the previous embodiments, characterised by the fact that by rotating the lance 16005 it is possible to select the geometry of the outlet jet: rotating high-pressure conical jet nozzle 15029, high-pressure narrow angle nozzle 15027, high-pressure fan jet nozzle 15028, low-pressure fan jet nozzle 15023.

[0120] The previous description generally makes reference to a motor 2100. The motor 2100 may be an electrical motor, an internal combustion engine, or any other kind of motor. In the case of an internal combustion engine, the elements schematically represented as the motor 2100 may include the engine itself and the fuel tank. In the same way, in the case of a battery-powered electric motor, the elements schematically represented as the motor 2100 may include both the motor and the battery.

[0121] While the present invention has been previously clarified by means of the detailed description of some of its embodiments represented in the drawings, the present invention is not limited to the embodiments described above and represented in the drawings; on the contrary, further variants of the embodiments described fall within the scope of the present invention as defined by the claims.

[0122] Furthermore, further embodiment variants may feature appropriate combinations of the previously described solutions with reference to the various embodiments. In particular, individual elements of each embodiment described may be combined with individual elements of any other embodiment described.

TABLE-US-00001 List of reference numbers 1000: Pressure washer 1001: Body 1002: Wheels 1003: Flexible hose 1004: Lance 1005: Jet 1006: Motor-pump assembly 1007: Liquid container 2000: Device for the discharge of a pressurised liquid 2100: Motor 2110: Transmission 2300: Discharge lance 2310: Discharge nozzle 2400: Intake section 2500: Flexible hose 2800: Rotating joint 2801: Ball joint 2802: Sliding joint 2803: Fastening element 2804: Interlocking coupling 3200: Pump 3210: Cam 3211: Input shaft 3212: Asymmetric inclined plate 3213: Bearing 3220: Piston 3221: Elastic device 3230: Cylinder 3240: Compression chamber 3250: Intake valve 3251: Outlet valve 3252: Safety valve 3253: Ribs 3260: Outlet chamber 3261: Outlet 3410: Intake line 3411: Distribution duct 3412: Return duct 4200: Pump 4210: Cam 4212: Asymmetric inclined plate 4220: Rolling element 52000: Pump 5220A-C: Piston 5200: Pump 5220A: Piston 5220B: Piston 5220C: Piston 6100: Motor 6120: Output shaft 6130: Motor body 6270: Pump body 7270: Pump body 7271: Elastic device 7272: Alignment and/or positioning and/or locking device 7150: Locking device 8270: Pump body 9140: Motor control device 9600: Handle 10254: Outlet check valve 10255: Elastic device 10256: Control lever 10257: Shutter 10258: Eccentric element 11300: Mixing section 11700: Tank 11710: Mixing hole 11720: Liquid 12300: Mixing section 12710: Mixing hole 12730: Mixing control device 13300: Mixing section 13320: Venturi tube 13330: Valve 14300: Discharge lance 14310: Low-pressure discharge nozzle 14311: High-pressure discharge nozzle 14340: Fixed part 14341: Fixed part opening 14350: Mobile part 14351A: Mobile part opening 14351B: Mobile part opening 14360: Rotational elements 15001: Main shaft 15002: Bearings 15003: Inclined disc rotor 15004: Axial bearing 15005: Piston 15006: Axial bearing 15007: Piston return springs 15008: Circlips 15009: Guide 15010: Lubrication gaskets 15011: Pump body 15012: Compression chamber 15013: Water gaskets 15014: Intake valve 15015: Outlet valve 15016: Intake circuit 15017: Supply line 15018: Outlet circuit 15019: Washing lance 15020: Venturi tube 15021: Outlet check valve 15022: Detergent tank 15023: Fan jet low-pressure nozzle 15024: Detergent adjustment screw 15025: Tank cap 15026: Detergent tank check valve 15027: Narrow angle high-pressure nozzle 15028: Fan jet high-pressure nozzle 15029: Rotating conical jet high-pressure nozzle 15030: Central Duct 15031: Distributor disc 15032: Nozzles body 15033: Sealing ring 15034: Safety valve 15035: Power take off 15036: Lance positioning spring 16001: Connection body 16002: Pump assembly 16003: Water intake 16004: Tank 16005: Lance 16006: External power take off 16007: Shaped hub 16008: Anti-rotation positioning element 16009: Locking clamp