DEVICE FOR GENERATING NEGATIVE PRESSURE

Abstract

A device for generating negative pressure by a pressurized fluid, which device comprises an inflow channel and an outflow channel and, for a pressurized fluid, an injection channel, the outlet of which is arranged at a distance from the inlet of the inflow channel. In the device, the inflow channel, the injection channel and the outflow channel are arranged along a common longitudinal center axis. The injection channel is arranged between the inflow channel and the outflow channel. By arranging the inflow channel, the injection channel and the outflow channel along a common longitudinal center axis, a favorable flow pattern is obtained, which preferably allows for efficient generation of a negative pressure at the inlet of the inflow channel by means of the pressurized fluid.

Claims

1. A device for generating negative pressure by a pressurized fluid, the device comprising an inflow channel and an outflow channel, and an injection channels, an outlet of which is arranged at a distance from an inlet of the inflow channel, wherein the inflow channel, the injection channel and the outflow channel are arranged along a common longitudinal center axis, the injection channel and the outflow channel have round inner cross-sections, and the injection channel in a first section from its inlet tapers and has an outlet in a terminal section, and the injection channel is at least sectionally enclosed in a carrier projecting radially into the inflow channels, and the inlet of the injection channel is connected to a supply line for pressurized fluid, which supply line is arranged inside of the carrier and has a connecting section extending radially with respect to the longitudinal center axis, wherein said inflow channel forms an area of annular cross-section around a cantilevered section of the injection channel up to adjacent to the inlet of the outflow channel, wherein the inlet of the outflow channel is arranged at a distance from the outlet of the injection channel or the outlet of the injection channel is arranged within the outflow channel, and wherein the outflow channel in a first section from its inlet tapers towards a second section of constant diameter, and adjacently widens in a third section towards its outlet, wherein the carrier, the injection channel and the supply line are contained in a central piece and in that the outflow channel is formed in a tubular element, which is detachably connected to the central piece exclusively in that an end section of the tubular element, in which end section the outflow channel is formed, encloses or is enclosed by the section of the central piece in which the cantilevered section of the injection channel is arranged.

2. The device according to claim 1, wherein the tubular element is detachably connected to the central piece exclusively in that the connection is a plug-in connection or a bayonet connection.

3. The device according to claim 1, wherein the central piece contains the injection channel including its cantilevered section and the supply line, and in that the central piece is formed as a single piece.

4. The device according to claim 1, wherein the carrier, the injection channel and the supply line are contained in a central piece, and in that at least a part of the inflow channel is arranged or formed in a pipe piece which is detachably connected to the central piece.

5. The device according claim 1, wherein the inflow channel is formed as a single piece with the central piece.

6. The device according to claim 1, wherein the inflow channel in the section in which the carrier projects into the inflow channel has an area of annular cross-section into which the carrier projects and the inner radius of the inflow channel is delimited by the carrier.

7. The device according to claim 1, wherein the injection channel in a terminal section widens towards its outlet and/or the injection channel adjacent to its outlet has a cantilevered section which is connected only to one carrier projecting radially into the inflow channel.

8. The device according to claim 1, wherein the injection channel from its inlet in its first section tapers towards a second section of constant diameter and in an adjacent terminal section widens towards its outlet.

9. The device according to claim 1, wherein the carrier projects radially through the inflow channel and the inflow channel consists of two partial channels between which the carrier is arranged.

10. The device according to claim 1, wherein the carrier is formed as a single piece with the cantilevered section of the injection channel and with the inflow channel.

11. The device according to claim 1, wherein the tubular element, in which the outflow channel is formed, has a terminal section which is detachably connected to the inflow channel or to the central piece, and which encloses the cantilevered section of the injection channel.

12. The device according to claim 1 formed entirely as a single piece.

13. The device according to claim 1, wherein the outlet of the injection channel has a smaller cross-section than the inlet of the outflow channel.

14. The device according to claim 1, wherein the cantilevered section of the injection channel has an outer diameter which decreases towards the outlet of the injection channel.

15. The device according to claim 1, wherein a ring is detachably connected to and longitudinally displaceable along the outer surface of the outflow channel, and an elastic hose piece, which has at least one slit in its wall and is closed at one end, is attached to the ring and encloses the outlet of the outflow channel.

16. The device according to claim 1, wherein a suction bell with its inner volume is connected to the inlet of the inflow channel.

17. The device according to claim 1, wherein a section of the central piece that lies opposite to the tubular element is arranged slidably along the longitudinal center axis in a recess which is spanned open by a pipe piece and which does not have a thread.

18. The device according to claim 1, wherein the section of the central piece lying opposite to the tubular element is arranged in a clamping and rotatable manner in a recess of a pipe piece in which an annular section of a supply line for pressurized fluid is formed, which annular section is connected in a fluid-tight manner to the injection channel.

19. A process for aspirating an object by a device according to claim 1 by applying a pressurized fluid to the supply line and comprising a step of removing a tubular element in which the outflow channel is formed, and/or of removing a pipe piece, in which the inflow channel is formed, from a central piece, cleaning at least one of the central piece, the tubular member and the pipe piece, and reconnecting them to one another.

Description

[0031] The invention is now described with reference to the figures:

[0032] FIG. 1 shows a single-pieced embodiment of the device, in A) in section A-A in perpendicular to the longitudinal center axis, in B) in longitudinal section B-B along the longitudinal center axis, in C) in top view onto the inlet of the inflow channel,

[0033] FIG. 2 shows a two-pieced embodiment of the carrier and of the outflow channel A) in top view, B) in section A-A, and C) in section B-B, in D) in longitudinal section C-C of the top view E) onto the carrier from the perspective of the inlet of the inflow channel,

[0034] FIG. 3 shows an embodiment having a silencer on the outlet channel, in A) in top view, in B) in longitudinal section,

[0035] FIG. 4 shows an embodiment in exploded view, in A) in top view, in B) in longitudinal section A-A, in C) in top view onto the outlet of the outflow channel, in each case without showing the inflow channel, in D) an embodiment arranged in a recess of a pipe piece, and

[0036] FIG. 5 shows a device connected to a suction bell, in A) in top view onto the outer surface of the suction bell or resp. from the direction onto the outlet of the outflow channel, in B) in side view onto the device, and in C) in section A-A of A) in parallel to the longitudinal center axis.

[0037] FIG. 1 shows a device having an inflow channel 1 extending from its inlet 2 to its outlet 3, which inflow channel 1 forms an area 4 of annular cross-section around the cantilevered section 5 of the injection channel 20. The cantilevered section 5 of the injection channel 20 terminates with the outlet 24 of the injection channel 20, which adjacent to its inlet 25 has a first section 21 that tapers from its inlet 25 to a second section 22 having a constant cross-section. From the second section 22, the cross-section of the injection channel 20 increases in an adjacent terminal section 23 up to its outlet 24. The injection channel 20 is formed in a carrier 6 which extends radially from the wall into the inflow channel 1 and which restricts the cross-section of the inflow channel 1, at least in sections, to a sectional annular shape, or resp. to a C-shape. The carrier 6 is formed single-pieced with the injection channel 20 and its cantilevered section 5.

[0038] The outflow channel 30 extends from its inlet 34 at its first section 31, the cross-section of which tapers to a second section 32 of constant diameter, through its second section and through an adjacent third section 33, the cross-section of which widens towards its outlet 35.

[0039] In the variant shown here, the outlet 24 of the injection channel 20 is arranged at a distance from the inlet 34 of the outflow channel 30, so that between the outlet 24 of the injection channel 20 and the inlet 34 of the outflow channel 30, an annular region is delimited which is in connection to the area 4 of annular cross-section that is spanned open by the inflow channel 1.

[0040] A supply line 40 for pressurized fluid is connected to the inlet 25 of the injection channel 20 and, according to a preferred embodiment, has a coaxial section 41 along the longitudinal center axis 7, which coaxial section 41 has the same diameter as the inlet 25 of the injection channel 20. A connecting section 42 of the supply line 40 for pressurized fluid extends radially with respect to the longitudinal center axis 7 and discharges into a screw connection 43 on the outside of the device.

[0041] In this embodiment, the entire device is formed single-pieced. This embodiment could be manufactured by means of 3D printing, e.g. by depositing a hardening plastic compound layer by layer, starting from the area of the inlet 2 of the inflow channel 1 in the direction towards the outlet 35 of the outflow channel 30.

[0042] FIG. 2 shows a preferred embodiment in which the carrier 6 together with the injection channel 20, including its cantilevered section 5, and the supply line 40 and at least a section of the area 4 having an annular cross-section are contained in a central piece 9, to the one end of which a tubular element 36 is detachably connectable and to the opposite end of which a pipe piece 8 is detachably connectable. Due to the position of the sectional plane in FIG. 2D), the inflow channel 1 that is formed in the central piece 9 is not visible there. The outflow channel 30 is formed in the tubular element 36. The tubular element 36 has a terminal section 37 which encloses the cantilevered section 5 of the injection channel 20 and which is detachably connected to the inflow channel 1 or to the central piece 9, here by means of a clamping joint. The central piece 9 of this embodiment has a connecting piece, formed by the section lying opposite to the tubular element 36, for the clamping joint to a pipe piece 8 in which the inflow channel 1 is to be arranged or is formed.

[0043] FIG. 2 in D) shows an embodiment in which the carrier 6 extends in two parts through the inflow channel 1 and divides it into two parts in the area of the carrier 6, as shown in FIGS. 2C) and 2E). The inlet channel 40 is formed in two parts, each extending radially with respect to the longitudinal center axis 7 in a respective part of the carrier 6. The formation of the carrier 6 in two parts extending radially through the inflow channel 1 can be formed in the preferred embodiment in which the carrier 6, the injection channel 20 and the supply line 40 are formed in a central piece 9, and the outflow channel 30 is contained in a tubular element 36 which is detachably connected to the central piece 9, and the inflow channel 1 is contained in a tubular piece 8 (shown sectionally in FIG. 4D), which is detachably connected to the central piece 9.

[0044] FIG. 2B) shows that the inflow channel 1 forms the area 4 of annular cross-section around the cantilevered section 5 of the injection channel 20.

[0045] FIGS. 3 in A) and B) shows a preferred embodiment of the device, in which embodiment the inflow channel 1 is not shown, with a silencer having an elastic hose piece 44 with at least one slot 45 as an opening, presently arranged in parallel to the longitudinal center axis 7. The hose piece 44 overlaps the outlet 35 of the outlet channel 30 and is closed by a terminal cover 46. The hose piece 44 can be connected to the outflow channel 30 by means of a ring 48 which encloses the outflow channel 30 in a clamping manner.

[0046] FIG. 4 in A) in top view as well as in B) in longitudinal section shows a central piece 9 and a tubular element 36, and in C) in cross-section A-A through a tubular element 36 shows a preferred embodiment in which both the outflow channel 30 is formed in a tubular element 36 and is detachably connected to the carrier 6, and the inflow channel 1 is formed in a pipe piece 8 which opposite to the tubular element 36 is detachably connected to the carrier 6. The tubular element 36 that forms the outflow channel 30, and the pipe piece 8 that forms the inflow channel are each attached to the carrier 6 by a releasable connection, which carrier 6 contains the injection channel 20 and the supply line 40. The releasable connections can, each independently from one another, be e.g. plug-in connections, e.g. clamping joints, or can be screw connections, which are preferably fluid-tight. The tubular element 36 has a section enclosing the area 4 of annular cross-section that is formed by the carrier 6. Alternatively, the wall, which delimits the area 4 of annular cross-section in its outer diameter, can be formed by a section of the tubular element 36. The circumferential grooves 11 are provided for receiving sealing rings 10, which form a fluid-tight clamping joint between this section of the central piece 9 and a cylindrical recess, e.g. of a pipe piece, in which the outlet 2 of the inflow channel 1 opens in order to apply negative pressure there.

[0047] In FIG. 4D), the embodiment having an additional hose piece 44 is shown, which has slots 45 and a terminal cover 46 as a silencer, arranged on a pipe piece 8. The section of the central piece 9, which lies opposite to the tubular element 36 containing the outflow channel 30, is inserted into a cylindrical recess of the pipe piece 8. This section of the central piece 9 has sealing rings 10 arranged in circumferential grooves 11, which sealing rings 10 seal the section of the central piece 9 against the cylindrical recess in the pipe piece 8. Since negative pressure is generated at the inlet 2 of the inflow channel 1 when pressurized fluid is applied to the injection channel 20, a simple plug-in connection without latching or threading between the central piece 9 and the pipe piece 8 is sufficient to hold the central piece 9 to the pipe piece 8. As generally preferred, the pipe piece 8 is part of a wall which can e.g. be plate-shaped or can be part of a suction bell. As generally preferred, the supply line 40 has an annular section through which pressurized fluid can flow into the injection channel 20 in any rotational position of the central piece 9.

[0048] FIG. 5 in A) to C) shows a device having a suction bell 47 that is connected to the inlet 2 of the inflow channel 1 so that a fluid can be aspirated from within the suction bell 47 through the inflow channel 1 to generate a negative pressure within the suction bell 47. In this embodiment, the inflow channel 1 is formed single-pieced with the central piece 9, and the tubular element 36 in which the outflow channel 30 is formed, is detachably connected to the central piece 9.

TABLE-US-00001 List of reference signs: 1 inflow channel 2 inlet of the inflow channel 3 outlet of the inlet channel 4 area of annular cross-section 5 cantilevered section of the injection channel 6 carrier 7 longitudinal center axis 8 pipe piece 9 central piece 10 sealing ring 11 groove for sealing ring 20 injection channel 21 first section of the injection channel 22 second section of the injection channel 23 terminal section of the injection channel 24 outlet of the injection channel 25 inlet of the injection channel 30 outflow channel 31 first section of the outflow channel 32 second section of the outflow channel 33 third section of the outflow channel 34 inlet of the outflow channel 35 outlet of the outflow channel 36 tubular element 37 terminal section of the tubular element 40 supply line 41 coaxial section of the supply line 42 connecting section of the supply line 43 screw connection 44 hose piece 45 slot 46 terminal cover 47 suction bell 48 ring