PUMP

Abstract

A description is given of a pump comprising a suction space which is at least partly bounded by a flexible body and which is located between end elements at least one of which can be driven so as to move in a reciprocating manner, a delivery space which surrounds the suction space and around which a housing is provided, and valves provided in the housing and in at least one of the end elements, the valves being constructed such that when the volume of the suction space is increased, a medium is sucked into said suction space, which, when the volume is reduced, flows through one of the valves to the delivery space from which it is expelled when the volume of the delivery space is reduced.

Claims

1. A pump comprising: a suction space which is at least partly bounded by a flexible body and which is located between end elements at least one of which is configured so as to move in a reciprocating manner, a delivery space which surrounds the suction space and around which a housing is provided, and valves provided in the housing and in at least one of the end elements, the valves being constructed such that when the volume of the suction space is increased, a medium is sucked into said suction space, which, when the volume is reduced, flows through one of the valves to the delivery space from which it is expelled when the volume of the delivery space is reduced.

2. The pump according to claim 1, wherein the suction space is a substantially cylindrical space, of which at least part of the circumference is formed by the flexible body.

3. The pump according to claim 1, wherein the flexible body is a bellows, or a belt, tyre, in particular an outer tyre.

4. The pump according to claim 1, wherein the at least one valve provided between the suction space and the delivery space in the respective end element is a valve which opens and closes in response to excess pressure and reduced pressure, respectively, in the suction space.

5. The pump according to claim 1, wherein the pump comprises an intake and an outlet for the medium, which are each connected to the suction space and the delivery space, respectively, through one of the valves.

6. The pump according to claim 1, wherein part of the housing of the pump forms a fixed end element of the suction space.

7. The pump according to claim 1, wherein the end elements are substantially flat end plates.

8. The pump according to claim 1, wherein the pump comprises a rod which is configured to move in a reciprocating manner, which is connected to the at least one end element which is configured to move in a reciprocating manner.

9. The pump according to claim 8, wherein the pump comprises a mechanism, such as an eccentric mechanism or a crankshaft mechanism, which is connected to the drivable rod and by means of which, if required, the stroke of the rod is set.

10. The pump according to claim 1, wherein the valves are automatically operating valves.

11. A method of pumping wherein, inside a pump, by reciprocating a flexible body which is subjected to flexural strain thereby, the method comprises: during a first phase, the volume of a suction space which is at least partly bounded by the body is reduced, causing a medium contained therein to be forced, through a valve, into a delivery space which surrounds the suction space, after which during a second phase, when expansion of the suction space takes place, and when the valve closes, a reduced pressure is formed therein and, at the same time, an excess pressure is formed in the delivery space, causing the medium to be expelled.

12. The method according to claim 11, wherein the reduced pressure in the suction space during the second phase causes medium to be drawn into the suction space through an intake, and the excess pressure in the suction space during the first phase causes said medium to be forced into the delivery space through the valve.

13. The method according to claim 11, wherein the pump including a suction space which is at least partly bounded by a flexible body and which is located between end elements at least one of which is configured so as to move in a reciprocating manner,a delivery space which surrounds the suction space and around which a housing is provided, and valves provided in the housing and in at least one of the end elements, the valves being constructed such that when the volume of the suction space is increased, a medium is sucked into said suction space, which when the volume is reduced, flows through one of the valves to the delivery space from which it is expelled when the volume of the delivery space is reduced, which is used as a vacuum pump and which is connected to a non-self-starting pump, such as a centrifugal pump.

14. The method of claim 11 wherein pumping includes pumping a medium or a mixture of mediums, which may or may not contain air, or in the process of pumping water or water vapor which may or may not contain air, or in the process of pumping air which may or may not contain water and/or water vapor.

15. The method of claim 11 werein the pump is used as a vacuum pump, wherein the medium is air, which may or may not contain dirty water, such as waste water, sewage water or groundwater, or which comprises surface water or water obtained from well-point de-watering.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0018] The figure is a schematic view of a pump.

DETAILED DESCRIPTION

[0019] The pump and the method according to the present invention will now be explained in greater detail with reference to the figure mentioned below, in which a possible embodiment is shown, but by means of which also further possible embodiments as well as the principle on which the present invention is based will be explained.

[0020] The figure shows a pump 1 comprising a housing 2 within which a delivery space 3 is located within which there is a suction space 4. The walls of the predominantly cylindrical suction space 4 are formed by a flexible body 5, which is connected to end elements 6-1, 6-2. In this case, the element 6-1 can be driven in a reciprocating manner by means of a mechanism 7, which will be elucidated hereinafter. If the end elements 6-1, 6-2 approach one another, the volume of the suction space is minimal, and the consequently inwardly bent body 5 is in a folded-up state, like a bellows, between said elements, and the volume of the delivery space 3 is maximal. Conversely, in the case that the end elements 6-1, 6-2 are the maximum distance apart, the consequently outwardly bent body 5 is in an unfolded state between said elements, and the volume of the suction space 4 is maximal, while that of the delivery space is minimal.

[0021] The pump 1 comprises an intake pipe 8 connected to the suction space 4, and a valve 9 arranged therebetween, which, in the case shown, opens automatically if a medium is drawn from the intake pipe 8 through the valve 9. An end element in the form of an end plate 6-1 is shown, which moves in a reciprocating manner under the influence of a movable rod 10 which is connected to said end plate and which is part of the mechanism 7 of the pump 1. In the embodiment shown, the end plate 6-2 forms part of the fixed lower side of the housing 2.

[0022] The pump 1 further comprises an outlet pipe 11 connected to the delivery space 3 through a valve 12. In the end plate 6-1, there is provided a valve 13 which closes automatically during the abovementioned medium-drawing process. If the direction of movement of the rod 10 reverses, causing the valve 9 to close automatically and likewise the valve 13 to open automatically due to the medium pressure in the suction space 4, the medium flows, during this transition phase, from the suction space 4 to the delivery space 3 until the minimum volume of the suction space 4 is reached. If the direction of movement of the rod reverses again, and hence the space 4 expands, the valve 13 closes automatically and, during this delivery phase, the medium is forced towards the outlet pipe 11 through the valve 12 which is in the process of opening. Also, during this delivery phase, the suction space 4 is filled again with medium drawn through the open valve 9. The method explained hereinabove continues.

[0023] The flexible body 5, which, as shown in the figure, is completely located inside the delivery space, may be a bellows known per se, but also a belt, a tyre, in particular an outer tyre. The two plates 6-1, 6-2, which are generally substantially flat in practice, with which the respective edges of the tyres are connected are similar to the rim of a wheel, however, as explained hereinbefore, the plates 6 are constructed so as to be movable with respect to one another. Advantageously, use can even be made of worn tyres 5 costing near to nothing or nothing at all.

[0024] The movable end plate 6-1 shown in the figure is connected, as explained hereinbefore, to a rod 10 which can move in a reciprocating manner and which is connected, via a bushing 14 in the other end plate 6-2, with the suitable mechanism 7, such as an eccentric mechanism or a crankshaft mechanism 7. In a manner which is known per se, this mechanism 7 is arranged so as to be capable of setting the length of stroke of the rod, by means of which the suction and pressure capacity of the pump 1 can be influenced. The mechanism 7 is connected, in practice, with a rotating driving motor, not shown.

[0025] The pump 1 may be an autonomous pump, for example for drawing and pumping out a medium or a mixture of mediums which may or may not contain air. Said mixture may be water containing water vapor or air, but it may also be air containing water and/or water vapor. The pump 1 may also be used as a vacuum pump or, for example, it may be connected with a non-self-starting pump, such as a centrifugal pump, to draw water to the eye of such a pump, as a result of which this combination can readily start by itself.

[0026] The pump 1 itself is insensitive to contamination in the medium, allowing it to transfer even dirty water, such as waste water, sewage water or groundwater, wether or not in alternation with medium originating from surface water or well-point de-watering.