US20140234132A1 - Pump, In Particular Pneumatic Pump - Google Patents
Pump, In Particular Pneumatic Pump Download PDFInfo
- Publication number
- US20140234132A1 US20140234132A1 US14/123,998 US201214123998A US2014234132A1 US 20140234132 A1 US20140234132 A1 US 20140234132A1 US 201214123998 A US201214123998 A US 201214123998A US 2014234132 A1 US2014234132 A1 US 2014234132A1
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- United States
- Prior art keywords
- pump
- valve
- housing
- spring
- pump according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/045—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms with in- or outlet valve arranged in the plate-like pumping flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0045—Special features with a number of independent working chambers which are actuated successively by one mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/03—Stopping, starting, unloading or idling control by means of valves
- F04B49/035—Bypassing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
Definitions
- a pump of the type described above is additionally equipped with a pressure relief valve used especially when a vehicle's seat bladders are being filled because they can leak under an excess pressure load.
- the pressure relief valve in turn, has a valve element that closes a pressure relief opening and in closing direction rests on a spring element arranged in a spring space.
- the excess pressure valve opens when there is a limit pressure set by the spring element.
- the limit pressure can vary depending on the application. So far, the approach has been to use springs of various strengths in the assembly of the pump, but this entails a corresponding logistical and technical assembly effort. Additionally, there is the risk of that the wrong springs could be fit into the pump during assembly.
- the task of the invention is to suggest a pump of the type described above to remedy this situation.
- the inner wall of the spring space to have a regulating area extending along the closing direction by holding the excessively dimensioned stop element in a clamped way with regard to the regulating area, whereby the spring space has an actuating opening through which the stop element advancing in closing direction is accessible with a tappet or the like, for example.
- the clamping force can be chosen through corresponding dimensional ratios in such a way that the stop element impinged on by the spring element against the closing direction is reliably held in the intended position in the adjustment area.
- a more or less elastic and/or plastic deformation of the stop element takes place and/or of a housing wall that circumscribes the spring space.
- a stop element made of a material harder than the one used for the pump's housing or for the housing wall that circumscribes the spring space is advantageous.
- the stop element is pressed into the material of a housing wall that circumscribes the spring space.
- a metallic stop element is preferably used.
- a stop element executed as a sphere is used, in which case the adjustment area that acts together with the stop element is circularly cylindrical, i.e. forms the surface shell of a circular cylinder.
- This design rules out a wrong assembly caused by erroneously positioning the stop element in the spring space, for example in a wrong turning position with regard to an axis running parallel to the closing direction.
- noise reduction is achieved by having the lower-pressure side of the pressure relief valve end in the spring space.
- the spring space With regard to its surroundings, the spring space can be fully closed so there is no fluid connection to the atmosphere and therefore the propagation of an airborne noise generated inside the spring space is prevented from reaching the exterior.
- this bore hole can have a very small flow cross-section. It is different with the inlet opening, whose flow cross-section cannot be reduced at will so that an airborne noise generated in the pressure relief valve can propagate almost unhindered into the surroundings.
- FIG. 1 A perspective lateral view of a pump with a housing encompassing one upper part of the housing, one lower part of the housing, an upper and a lower support, and a motor,
- FIG. 7 A longitudinal cut through the pump housing with a cutting line corresponding to line VII-VII in FIGS. 4 & 5 ,
- FIG. 9 A partial sectional view of another embodiment of a pump, in which the spring space is connected to the surroundings via a bore hole;
- the pump 1 shown in the illustrations is intended to be installed in a vehicle seat and serves for filling seat bladders to change the contour of a vehicle seat in the sitting or backrest area, for example.
- the pump 1 comprises a housing 2 (especially made of plastic) on which an outlet connection piece 3 has been form-fitted.
- the side of the housing 2 supporting the outlet connection piece 3 will also be referred to as upper side 4 below.
- a motor 6 especially an electric motor, has been flanged onto the lower side 5 of the housing 2 .
- the housing 2 comprises an upper part 7 and a lower part 8 , in which case the upper part 7 supports the connection piece 3 and forms the upper side 4 .
- the inlet valves 30 and the outlet valves 33 have in each case a valve element 30 a that is freely cut as tongue-shaped parts from a valve membrane 13 forming an entire membrane and that in each case controls an inlet opening 30 and an outlet opening 33 c located in the upper support 9 .
- Each one of the valve elements 30 a acts with a seal seat 30 b protruding from the underside of the upper part of the housing 7 ( FIGS. 3 & 6 ).
- the seal seats 30 b are sections of a ring-shaped closed seal seat 32 that separates the lower pressure side of the pump 1 from its pressurized side.
- the valve seats 33 b assigned to the outlet valves 33 protrude from the upper side of the upper support 9 . In the situation shown in FIG. 7 , the valve element 33 a lies on top of the valve seat 33 b that encompasses the outlet opening 33 c.
- all inlet ports 35 end in a collecting space 41 (located above the valve membrane 13 ) arranged centrally on the pump in the direction of the arrow 40 in FIG. 1 in the top view.
- the collecting space 45 is circumscribed towards the top by the upper part of the housing 7 and towards the bottom by a central area of the valve membrane 13 that comprises the valve elements 30 a of the inlet valves 30 .
- the stop element 51 is inserted into the spring space 49 through the assembly opening 50 while the pump is being assembled and moved in closing direction 31 until the spring force exerted by the threaded compression spring 48 correlates with the desired limit pressure.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention relates to a pump comprising a housing (2), comprising at least one pump chamber (15), comprising in inlet valve (30) that has a valve element (30 a) which controls an inlet opening (30 c), comprising an outlet valve (33) that has a valve element (33 a) which controls an outlet opening (33 c), comprising a pressure relief valve (43) that has a valve element (43 a) which controls a pressure relief opening (43 c) and on which a spring element (48) acts in the closing direction (31), and comprising a spring chamber (49), that receives the spring element (48) end that faces away from the closing direction resting against the stop element.
Description
- The invention refers to a pump, in particular to a pneumatic pump. Pneumatic pumps are used in the automotive sector, for example, for filling the seat bladders with air to change the contour of the seat's sitting and backrest areas. A pump used for the purpose named above, for example, has at least one pump chamber. By enlarging and reducing the chamber volume with the help of a drive unit, surrounding air is suctioned into the pump chamber during volume enlargement and air is driven out from the pump chamber during volume reduction. To control the corresponding air flows, the pump is equipped with an inlet valve that has a valve element for controlling the inlet opening. The inlet valve opens autonomously when the pump chamber enlarges and air flows into it from the surroundings. An outlet valve serves for controlling the outgoing airflow. It is likewise equipped with a valve element, but it controls an outlet opening which opens when air is driven out of the pump chamber.
- A pump of the type described above is additionally equipped with a pressure relief valve used especially when a vehicle's seat bladders are being filled because they can leak under an excess pressure load. The pressure relief valve, in turn, has a valve element that closes a pressure relief opening and in closing direction rests on a spring element arranged in a spring space. When the pressure in the pump chamber exceeds a preset limit value, the excess pressure valve opens when there is a limit pressure set by the spring element. With regard to the respectively permissible maximum pressure of the pneumatic system or of a designed part thereof, the limit pressure can vary depending on the application. So far, the approach has been to use springs of various strengths in the assembly of the pump, but this entails a corresponding logistical and technical assembly effort. Additionally, there is the risk of that the wrong springs could be fit into the pump during assembly.
- The task of the invention is to suggest a pump of the type described above to remedy this situation.
- This task is solved according to
claim 1 by arranging a stop element accessible from the external side of the housing and movable in closing direction on which the spring element can rest with its end pointing towards the closing direction. In this way, the required limit pressure can be easily adjusted during assembly by building in a spring element in the spring space that can be universally used for limiting the pressure range. Afterwards, the stop element is brought into the spring space and while a pressure corresponding to the limit pressure is applied on the pump—is positioned with regard to its distance to the valve element in such a way that the desired limit pressure is reached. When doing so, deviations from limit pressure resulting from manufacturing tolerances can be compensated. - In an especially preferred design variant (particularly advantageous in pump housings made of plastic) it is foreseen for the inner wall of the spring space to have a regulating area extending along the closing direction by holding the excessively dimensioned stop element in a clamped way with regard to the regulating area, whereby the spring space has an actuating opening through which the stop element advancing in closing direction is accessible with a tappet or the like, for example. In this case, the clamping force can be chosen through corresponding dimensional ratios in such a way that the stop element impinged on by the spring element against the closing direction is reliably held in the intended position in the adjustment area. Depending on the chosen excess of the stop element, a more or less elastic and/or plastic deformation of the stop element takes place and/or of a housing wall that circumscribes the spring space. Particularly in the case of housings made of soft materials such as plastic, a stop element made of a material harder than the one used for the pump's housing or for the housing wall that circumscribes the spring space is advantageous. Here, the stop element is pressed into the material of a housing wall that circumscribes the spring space. A metallic stop element is preferably used.
- Seen in top view in closing direction, the stop element has a complementary shape to the inner transversal shape of the adjustment area. One result of this is the accomplishment of a sealing of the spring space towards the surroundings and another result is a higher clamping effect. Penetration of humidity into the spring space, for example, is thereby prevented.
- Preferably, a stop element executed as a sphere is used, in which case the adjustment area that acts together with the stop element is circularly cylindrical, i.e. forms the surface shell of a circular cylinder. This design rules out a wrong assembly caused by erroneously positioning the stop element in the spring space, for example in a wrong turning position with regard to an axis running parallel to the closing direction.
- When pressure relief valves of the type used here open, this is accompanied most of the time by the generation of noise. In at least one design variant independent from the spring space and stop element designs, noise reduction is achieved by having the lower-pressure side of the pressure relief valve end in the spring space. With regard to its surroundings, the spring space can be fully closed so there is no fluid connection to the atmosphere and therefore the propagation of an airborne noise generated inside the spring space is prevented from reaching the exterior. Even if the spring space is connected to the surroundings through a bore hole to allow pressure to equalize between spring space and surroundings—as is the case in a design variant—if excess pressure occurs, this bore hole can have a very small flow cross-section. It is different with the inlet opening, whose flow cross-section cannot be reduced at will so that an airborne noise generated in the pressure relief valve can propagate almost unhindered into the surroundings.
- The pressure-equalizing bore hole that connects the spring space to the surroundings mentioned above can be done completely without if the spring space is connected to the inlet opening, in which case its end located upstream (i.e. its entrance opening) does not end directly in the surroundings but in a housing space of the pump in which one drive unit for actuating the pump is arranged. In doing so, the drive unit acts like the insulating material in a sound absorber to eliminate the noise. However, in conventional pumps of the type presented here, the inlet opening is separated by a duct wall of the other housing spaces.
- The invention will now be explained in more detail with the help of the enclosed drawings, which show:
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FIG. 1 : A perspective lateral view of a pump with a housing encompassing one upper part of the housing, one lower part of the housing, an upper and a lower support, and a motor, -
FIG. 2 : An exploded view of the pump shown inFIG. 1 , -
FIG. 3 : A perspective view of the housing's upper part, -
FIG. 4 : A perspective view of a valve membrane arranged between the upper part of the housing and the upper support, -
FIG. 5 : A perspective view of the upper support, -
FIG. 6 : A longitudinal cut through the pump housing with a cutting line corresponding to line VI-VI inFIGS. 4 & 5 , -
FIG. 7 : A longitudinal cut through the pump housing with a cutting line corresponding to line VII-VII inFIGS. 4 & 5 , -
FIG. 8 : A longitudinal cut through the pump housing with a cutting line corresponding to line VIII-VIII inFIGS. 4 & 5 , -
FIG. 9 : A partial sectional view of another embodiment of a pump, in which the spring space is connected to the surroundings via a bore hole; -
FIG. 10 : A sectional view of the pump ofFIG. 9 , but shown from another angle. - To explain the invention, exemplary reference is made to a pneumatic pump, in which case the designs described also apply to pumps for fluids. The
pump 1 shown in the illustrations is intended to be installed in a vehicle seat and serves for filling seat bladders to change the contour of a vehicle seat in the sitting or backrest area, for example. Thepump 1 comprises a housing 2 (especially made of plastic) on which anoutlet connection piece 3 has been form-fitted. The side of thehousing 2 supporting theoutlet connection piece 3 will also be referred to asupper side 4 below. Amotor 6, especially an electric motor, has been flanged onto thelower side 5 of thehousing 2. Thehousing 2 comprises anupper part 7 and alower part 8, in which case theupper part 7 supports theconnection piece 3 and forms theupper side 4. Two plate-shaped supports—namely anupper support 9 and alower support 10—are clamped sandwich-like between theupper part 7 and thelower part 8. Between theupper support 9 and the upper part of thehousing 7, a plate-shaped valve membrane 13 made of an elastic material (e.g. a rubbery polymer) has been clamped in. Four pot-shaped depressions that createpump chambers 15 have been form-fitted in the pump membrane. In its upper border, thepump membrane 14 has acircumferential bulge 16 clamped between theupper support 9 and thelower support 10. On the upper part of the housing,peripheral arms 18 extending downwards have been form-fitted along the middlelongitudinal axis 17 of the pump. On the free end of two diametrically opposingarms 18, arear grip element 18 has been fixed or form-fitted that, by creating an axially effective positive-locking fit, grips anopposing element 20 on the lower part of thehousing 8 from behind. As a result of this, thevalve membrane 13, theupper support 9, thepump membrane 14 and thelower support 10 are axially tensed between the upper part of thehousing 7 and the lower part of thehousing 8. In the lower part of thehousing 9, there is aturnstile 23 obliquely positioned with respect to the middlelongitudinal axis 17 that has been mounted on an eccentric 25 with anaxis 24 protruding from its underside. The eccentric 25, in turn, is connected in a fixed rotary way to adrive shaft 26 of themotor 6. Thepump membrane 14 has on the underside, in the area of thepump chambers 15, a tappet-shaped extension 27 with a head-shaped end 28 fixed in arecess 29 of the turnstile. - Each
pump chamber 15 is assigned to aninlet valve 30 and an outlet valve 33. The outlet valves 33 are arranged in anoutlet port 34 that extends inwards from thepump chamber 15 all the way to theinlet connection piece 3 and finally ends in the surroundings. Theinlet valves 30 are arranged in aninlet port 35 in which—with respect to theinflow direction 36—suctioned air flows towards the pump chamber, theend 37 located upstream ends in ahousing space 38, in which adrive unit 39 for actuating the pump chambers 15 (i.e. for enlarging and reducing them), in this case theturnstile 23 and the eccentric 25, are arranged. Theinlet valves 30 and the outlet valves 33 have in each case avalve element 30 a that is freely cut as tongue-shaped parts from avalve membrane 13 forming an entire membrane and that in each case controls aninlet opening 30 and anoutlet opening 33 c located in theupper support 9. Each one of thevalve elements 30 a acts with aseal seat 30 b protruding from the underside of the upper part of the housing 7 (FIGS. 3 & 6 ). The seal seats 30 b are sections of a ring-shaped closed seal seat 32 that separates the lower pressure side of thepump 1 from its pressurized side. The valve seats 33 b assigned to the outlet valves 33 protrude from the upper side of theupper support 9. In the situation shown inFIG. 7 , thevalve element 33 a lies on top of thevalve seat 33 b that encompasses the outlet opening 33 c. - On the upper side of the
valve membrane 13, allinlet ports 35 end in a collecting space 41 (located above the valve membrane 13) arranged centrally on the pump in the direction of thearrow 40 inFIG. 1 in the top view. The collectingspace 45 is circumscribed towards the top by the upper part of thehousing 7 and towards the bottom by a central area of thevalve membrane 13 that comprises thevalve elements 30 a of theinlet valves 30. - Apart from the inlet and
outlet vales 30, 33, thepump 1 is equipped with apressure relief valve 43 developed between a central area of thevalve membrane 13 that forms avalve element 43 a and aseal seat 43 b of theupper support 9. Thevalve element 43 b is centrally arranged in the collectingspace 41 and interfused by acentral connection opening 44. Thus, thevalve element 43 a is the peripheral area of thevalve membrane 13 that circumscribes the connection opening. Thevalve element 43 a lies on a ring-shapedseal seat 43 b of theupper support 9 that circumscribes thepressure relief opening 43 c. To increase the sealing effect, the peripheral area mentioned above has a sealinglip 45 on its underside. An opening 42 a interfused with thepump membrane 14 is located centrally in the latter. Below theopening 45, the central area of thepump membrane 14 surrounded by thepump chambers 15 is supported by anarea 42 of thelower support 8 that bulges out upwards, in which case it is also interfused with anopening 46. Thus, the section of theinlet port 35 extending away from thevalve element 30 a of theinlet valves 30 against theinflow direction 36 is created by the collecting space, theconnection opening 44 andsubsequent openings inlet port 35 ends with theopening 46 in thehousing space 38, which is circumscribed by thelower support 10 and the lower part of thehousing 8. - A largely
cylindrical connection piece 47 open towards the upper side of thehousing 4 juts out from a central position of the upper part of thehousing 7. The interior of the connection piece creates aspring space 49 for receiving aspring element 48, namely a threaded compression spring. On its front side facing away from the upper part of thehousing 7, theconnection piece 47 has anassembly opening 50 over which thespring element 48 can be inserted into thespring space 49. Thespring element 49 supports itself with its lower end on thevalve element 43 a of thepressure relief valve 43 by means of an intermediate layer of a supportingring 52, thus impinging on the former in closing direction 31. The other end of thespring element 48, on the other hand, supports itself on astop element 51 arranged on a fixed axis (with respect to the mediumlongitudinal axis 17, inside anadjustment area 53 formed by a longitudinal section of theinner wall 54 of the spring space 49). The axially fixed fixation of thestop element 51 is accomplished by making its dimension transversal to the mediumlongitudinal axis 17 slightly larger than the inside diameter of theadjustment area 53. In the examples shown in the drawings, theinner wall 54 of the adjustment area is cylindrical or extends on the outer surface of a cylinder and has an inside width ordiameter 55 that is smaller than the dimension of thestop element 51 in a direction running transversally to the mediumlongitudinal axis 17. Thestop element 51 is preferably a metallic sphere with adiameter 56 slightly larger than theinner diameter 55 of theadjustment area 53. Owing to the dimensions mentioned above and the connection piece's softer plastic material compared to the metallic sphere, thestop element 51 digs itself into thecontact area 57 by forming a ring-shapedcavity 58 in theinner wall 54 of theconnection piece 47. The dimension relationships mentioned above have been chosen in this case so that the clamping force with which thestop element 51 is held in theadjustment area 53 is larger than the force exerted by thespring element 48 in axial direction. To set a certain limit pressure (i.e. a pump chamber pressure) to which thepressure relief valve 43 should react, thestop element 51 is inserted into thespring space 49 through theassembly opening 50 while the pump is being assembled and moved in closing direction 31 until the spring force exerted by the threadedcompression spring 48 correlates with the desired limit pressure. - In the design variant shown in
FIGS. 9 & 10 , thespring space 49′ is not connected to an inlet port. Here, the pressure between the spring space and the surroundings is compensated through aconnection opening 59 interfused with the wall of theconnection piece 47. As in the design variant described above, thevalve element 43 a lies on a ring-shapedseal seat 43 b′, though it does not border an opening but merely arecess 60 closed towards the bottom. The inlet port (not shown) is therefore not connected to thespring space 49. - The way the pump works will now be explained: When the air from the surroundings or from the
housing space 38 is suctioned, it enlarges thepump chambers 15 by moving theextensions 27 of thepump membrane 14 downwards. The air [flows] through theopenings inlet valves 30 to the pump chambers 15 (FIG. 6 ). When this occurs, thevalve element 30 a is elastically deformed and moved downwards (arrow 64) and as this happens, it lifts off theseal seat 30 b. Thevalve elements 30 a and thevalve elements 33 a of the outlet valves 33 are not as thick as the remainingvalve membrane 13, so that in each case a free space is created above and below the valve elements that allows the valve elements to be lifted from the respective valve seat. - If the
extensions 27 move upwards, thepump chambers 15 are made smaller and air is driven out of them. The air that was driven out flows through theoutlet openings 33 c in accordance with arrow 66 inFIG. 7 and reaches a pressure space (see alsoFIG. 3 ) bordered by thevalve membrane 13, the upper part of thehousing 7 and the seal seat 32. The pressure space is connected to theoutlet port 34 of theoutlet connection piece 3. - If excess pressure exceeds the limit pressure, the
pressure relief valve 43 reacts. When this occurs, thevalve element 43 a is lifted off thevalve seat connection opening 44 available in thevalve element 43 a. In the design variant shown inFIGS. 9 and 10 , pressure is compensated with the surroundings through theconnection opening 59, otherwise via theinlet port 35. The impingement of thevalve element 43 a with excess pressure takes place through anotherpressure space 68 arranged below the valve membrane and bordered by it and theupper support 9. Thepressure space 67 mentioned above arranged above the valve membrane is connected to thepressure space 68 arranged below the valve membrane throughopenings 69.
Claims (15)
1. Pump with a housing (2), with at least one pump chamber (15), with an inlet valve (30) equipped with a valve element (30 a) that controls an inlet opening (30 c), with an outlet valve (33) equipped with a valve element (33 a) that controls an outlet opening (33 c), and with a pressure relief valve (43) equipped with a valve element (43 a) impinged on a spring element (48) in closing direction (31) that controls a pressure relief opening (43 c), and with a spring space (49) that contains the spring element, whereby a stop element (51) movable in closing direction (31) and accessible from the outer side of the housing is arranged, on which the spring element (48) supports itself with its end pointing against the closing direction, the inner wall (54) of the spring space (49) having an adjustment area (53) that extends along the closing direction (31) in which the excessively dimensioned stop element (51) with regard to the adjustment area (53) is held in place by clamping, in which case the spring space (49) has an assembly opening (150) through which the stop element is accessible for advancing towards closing direction, the stop element (51) being a sphere and that the inner wall (54) of the adjustment area (53) extends on a circular cylinder surface.
2-3. (canceled)
4. Pump according to claim 1 , characterized in that the stop element (51) is made of a material that is harder than the material of a housing area that circumscribes the spring space (49).
5. Pump according to claim 4 , characterized in that the housing (2) of the pump is made of plastic.
6. Pump according to claim 4 , characterized in that the stop element (51) is made of metal.
7. (canceled)
8. Pump according to claim 1 , characterized in that the lower-pressure side of the pressure relief valve (43) ends in the spring space (49).
9. Pump according to claim 8 , characterized in that the spring space (49) ends in the surroundings through a connection opening (59) in a wall circumscribing it.
10. Pump according to claim 8 , characterized in that the spring space (49) is connected to the inlet port (30).
11. Pump according to claim 10 , characterized in that the inlet port (30) ends in the spring space (49) through a connection opening (44) in the valve element (43 a) of the pressure relief valve (43).
12. Pump according to claim 11 , characterized in that a border area circumscribing the connection opening (44) of the valve element (43 a) is pressed by the spring element (48) against a ring-shaped seal seat (43 b) that encompasses a pressure relief opening (43 c).
13. Pump according to claim 8 , characterized in that the end of the inlet port (30) located upstream ends in a housing space (38) of the pump (1), in which a drive unit (39) that serves to drive the pump is arranged.
14. Pump according to claim 8 , characterized in that the valve elements (30 a, 33 a, 43 a) are part of a one-piece valve membrane (13) clamped between an upper part of the housing (7) and a support (9) supporting them.
15. Pump according to claim 8 , characterized in that it has several pump chambers (15), in which case they are distributed around the centrally arranged pressure relief valve (43) when seen in top view in closing direction (31).
16. Pump according to claim 8 , characterized in that the at least one pump chamber (15) is made up of a flexible pump membrane (14).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/097,484 US9261092B2 (en) | 2011-09-02 | 2013-12-05 | Pump, in particular pneumatic pump |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102011082105 | 2011-09-02 | ||
DE102011082105.8 | 2011-09-02 | ||
PCT/EP2012/067126 WO2013030408A1 (en) | 2011-09-02 | 2012-09-03 | Pump, in particular pneumatic pump |
Related Parent Applications (1)
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PCT/EP2012/067126 A-371-Of-International WO2013030408A1 (en) | 2011-09-02 | 2012-09-03 | Pump, in particular pneumatic pump |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/097,484 Continuation US9261092B2 (en) | 2011-09-02 | 2013-12-05 | Pump, in particular pneumatic pump |
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US20140234132A1 true US20140234132A1 (en) | 2014-08-21 |
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ID=46832367
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US14/123,998 Abandoned US20140234132A1 (en) | 2011-09-02 | 2012-09-03 | Pump, In Particular Pneumatic Pump |
US14/097,484 Active US9261092B2 (en) | 2011-09-02 | 2013-12-05 | Pump, in particular pneumatic pump |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US14/097,484 Active US9261092B2 (en) | 2011-09-02 | 2013-12-05 | Pump, in particular pneumatic pump |
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US (2) | US20140234132A1 (en) |
CN (2) | CN103717897A (en) |
DE (3) | DE112012002756B4 (en) |
WO (1) | WO2013030408A1 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
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DE112012002756B4 (en) * | 2011-09-02 | 2021-05-12 | Alfmeier Präzision SE | Pump, especially pneumatic pump |
DE102012218012A1 (en) * | 2012-10-02 | 2014-04-03 | Alfmeier Präzision AG Baugruppen und Systemlösungen | Housing with two plastic housing parts |
EP3134638B1 (en) * | 2014-04-21 | 2019-10-16 | Stanadyne LLC | Pressure relief valve for single plunger fuel pump |
US9822773B2 (en) | 2014-08-13 | 2017-11-21 | Nextern Inc. | Durable canted off-axis driver for quiet pneumatic pumping |
JP6593579B2 (en) * | 2015-04-27 | 2019-10-23 | ミツミ電機株式会社 | Small pump and diaphragm assembly used therefor |
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- 2012-09-03 CN CN201280027521.5A patent/CN103717897A/en active Pending
- 2012-09-03 DE DE202012013619.4U patent/DE202012013619U1/en not_active Expired - Lifetime
- 2012-09-03 US US14/123,998 patent/US20140234132A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
US20140161654A1 (en) | 2014-06-12 |
CN103711682B (en) | 2016-10-26 |
DE202012013619U1 (en) | 2018-08-17 |
CN103711682A (en) | 2014-04-09 |
US9261092B2 (en) | 2016-02-16 |
CN103717897A (en) | 2014-04-09 |
DE112012002756B4 (en) | 2021-05-12 |
DE112012002756A5 (en) | 2014-06-26 |
WO2013030408A1 (en) | 2013-03-07 |
DE112012005082B3 (en) | 2018-04-26 |
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