EP2733353A1 - Flüssigkeitspumpe - Google Patents
Flüssigkeitspumpe Download PDFInfo
- Publication number
- EP2733353A1 EP2733353A1 EP20120793012 EP12793012A EP2733353A1 EP 2733353 A1 EP2733353 A1 EP 2733353A1 EP 20120793012 EP20120793012 EP 20120793012 EP 12793012 A EP12793012 A EP 12793012A EP 2733353 A1 EP2733353 A1 EP 2733353A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- space
- fluid
- piston
- path
- chamber
- 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.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- 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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/128—Crankcases
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/16—Filtration; Moisture separation
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/20—Filtering
Definitions
- the present invention relates to a fluid pump configured to effect feeding/discharging of a fluid through movements of a piston. More particularly, the invention relates to a technique for controlling feeding/discharging of a fluid to/from a drive chamber in which there are disposed a connection rod connected to the piston, a crank mechanism, etc.
- PTL 1 discloses a vacuum pump including a piston mounted inside a cylinder to move back and forth therein, a driving means configured to convert a drive force of a motor into a reciprocal movement via a crank mechanism and transmit this reciprocal movement to the piston, and a valve body having an intake valve and a discharge valve and mounted in the cylinder head.
- a case at a position near a drive chamber (a crank chamber in this document) accommodating a crank mechanism, there is disposed a case; and in the cylinder wall, there is formed a discharge gas path for feeding discharge gas of a valve body to the interior space (a device chamber) of the case.
- the drive chamber and the interior space (the device chamber) of the case are communicated via a drive chamber side discharge port.
- the case forms a relief chamber side discharge port for discharging discharge gas present in the interior space into the atmosphere.
- the discharge gas is caused to flow through the discharge gas path, the crank chamber, the drive chamber side discharge port, the device chamber and the relief chamber side discharge port in this mentioned order, thus being discharged to the outside and variation in the pulsating pressure at the time of discharging is restricted, thus restricting gas discharging noise.
- PTL 2 discloses a compressor (an air compressing mechanism) configured as follows.
- a piston is mounted inside a cylinder to be movable back and forth.
- a valve assembly is provided in a cylinder head at an upper portion of a cylinder.
- a crank case is disposed at a lower portion of the cylinder and a cross-slider crank mechanism as a crank mechanism mounted inside this crank case and the piston are operably coupled with each other via a piston rod.
- an air passage is formed in a support member provided at a lower portion of the cylinder. And, to this air passage, a sealed chamber is connected (the arrangement shown in Fig. 5 in the document).
- an air filter is connected (the arrangement shown in Fig. 6 , Fig. 9, etc. in the document).
- the object of the present invention is to configure a fluid pump rationally which is capable of restricting suction of dust and/or moisture into the drive chamber while reducing the dive load through feeding/discharging of fluid to/from the drive chamber that drives a piston.
- a fluid pump comprises:
- the valve unit includes:
- the air sucked from the outside space into the drive chamber is always filtered through the fluid filter, whereby dust and/or moisture will be removed therefrom. And, a portion of the air fed to the discharge path from the pressure increasing/decreasing chamber at the time of this sucking operation is sucked into the drive chamber via the merging space. Therefore, the load on the piston is reduced and at the same time the amount of air to be sucked from the outside space can be reduced.
- the valve unit includes:
- the air of the outside space is fed, while being filtered through the fluid filter, from the merging space via the intake path as the fluid path to the pressure increasing/decreasing chamber and also the air of the drive chamber is fed from the ventilation path to the merging space, and a portion of this air fed to the merging space is fed to the intake path.
- the fluid pump includes a path block forming the merging space and an opening defined in a bottom wall of the path block for establishing communication between the interior space of the path block and the outside space; and an upper face of the bottom wall is formed with an inclined posture such that the upper face is positioned lower as it extends toward a position closer to the opening.
- the merging space is formed by the region surrounded by the vertical walls, and the fluid path and the ventilation path are communicated with each other outside the merging space.
- the fluid filter can be easily disposed under a condition of its movement being restricted by the vertical walls, e.g. by inserting the fluid filter to the space surrounded by the vertical walls.
- a tubular body may be provided to project downwards at a position on the side of the lower face of the bottom wall of the path block and surrounding the opening.
- a reciprocating type vacuum pump as an example of a fluid pump, comprises a piston 2 mounted inside a cylinder 1 to be movable back and forth therein, a pressure increasing/decreasing chamber A formed on the side of a cylinder head relative to the piston 2, and a drive chamber B formed opposite the pressure increasing/decreasing chamber A relative to the piston 2 and accommodating a crank mechanism C for transmitting a drive force to the piston 2.
- This vacuum pump is used as a negative pressure source for a brake booster (not shown) for an automobile.
- a negative pressure is developed in the pressure increasing/decreasing chamber A.
- a discharging direction to the left-hand side in Fig. 1
- air as a fluid is discharged from the pressure increasing/decreasing chamber A to the outside.
- this vacuum pump is not limited for an automobile. This pump can be used in various devices that require a negative pressure and can be used with a gas other than air as the fluid.
- valve unit V As a valve unit V is disposed at one end (on the side of the cylinder head) of the cylinder 1, this valve unit V and the piston 2 delimit the pressure increasing/decreasing chamber A therebetween. Further, as a pump housing 3 is disposed at the other end of the cylinder 1, the interior space of this pump housing 3 forms the drive chamber B.
- the pump housing 3 mounts an electric motor 4, and to a crank arm 5 rotatable together with an output shaft 4A of this electric motor 4, a base end of a connecting rod 6 is connected. And, the piston 2 is operably connected to the leading end of this connecting rod 6.
- the crank mechanism C includes the crank arm 5 and the connecting rod 6.
- the drive chamber B is configured such that a space opened laterally in the pump housing 3 is closed by a plate-like closure member 7.
- This closure member 7 defines a ventilation opening 7A.
- a path block 15 having an interior space communicated with this ventilation opening 7A is mounted on the lower face of the closure member 7 on the outer side thereof. And, this path block 15 and the closure member 7 are fixedly connected to the pump housing 3 with a fastener bolt 8. Further, a tubular portion 16 communicated with the interior space of the path block 15 is provided in the form of a projection toward the valve unit V.
- the valve unit V includes an intake valve 22 mounted at a position thereof communicated with a sucking space 21A (an example of "a control space") of a valve body 21 and a discharge valve 23 at a portion communicated with a discharging space 21 B (an example of "a feeding/discharging space”) of this valve body 21.
- the valve unit V further includes a cover plate 24 for isolating the sucking space 21 A and the discharging space 21 B from the outside. To this cover plate 24, there is connected a tube 25 for applying a negative pressure to an external brake booster (an example of "a pressurizing/depressurizing object").
- the intake valve 22 is formed of a material such as a resin which is flexibly deformable.
- the discharge valve 23 is configured to be urged by a spring 23S toward its closing direction. Then, when the air flow is to be blocked, with the urging force of the spring 23S, the outer perimeter of the valve 23 is placed into tight contact with the valve body 21. When the air flow is to be allowed, the outer perimeter will float off the valve body 21 against the urging force of the spring 23S to form a space for allowing the air flow.
- a ball or poppet or the like which is urged by a spring toward the closing direction or a plate-like member operable with a hinge may be employed.
- the valve body 21 includes a tubular projecting portion 26 communicated with the discharging space 21 B, with the projecting portion 26 projecting toward the pump housing 3.
- a tubular connecting pipe 9 is provided for interconnecting this projecting portion 26 and the tubular portion 16 under a mutually communicated state, and this connecting pipe 9 has one end thereof fitted on the projecting portion 26 and the other end thereof fitted on the tubular portion 16.
- the valve unit V is connected to the pump housing 3 in such a manner that the leading ends of connecting bolts 10 inserted to through holes of the valve body 21 and the cover plate 24 are threaded into female thread portions of the pump housing 3. This connection is done with a plurality of connecting bolts 10. At the time of this connection, the cylinder 1 will be bound between the valve unit V and the pump housing 3 and the connecting pipe 9 is bound between the valve unit V and the path block 15, whereby these components are united together.
- a ventilation path F is formed to extend from the ventilation opening 7A through the interior space of the path block 15 to be communicated with an opening 15H defined in the outer face of the path block 15.
- a fluid path E functioning as a discharge path, is formed to extend from the discharging space 21 B of the valve body 21 trough the connecting pipe 9 to be communicated with the interior space of the path block 15. This fluid path E is merged in a merging space G formed at an intermediate position of the ventilation path F, and an air filter 17 (an example of "a fluid filter”) is mounted in this merging space G.
- This vacuum pump as shown in Fig. 1 , is designed to be used under a posture that the electric motor 4 is disposed at an upper portion and the path block 15 is disposed at the lower side.
- the path block 15, as shown in Figs. 2-4 is configured such that at an upper position of a block body having a circular bottom wall 15A and a tubular wall 15B continuous from the outer perimeter of the wall 15A, a laterally projecting flange body 15C is formed integral therewith.
- the flange body 15C defines bolt holes 15D in which fastener bolts 8 are to be inserted, and at a position surrounding the block body, there is formed a seal groove 15E for accommodating a seal 19.
- an opening 15H which establishes communication between the interior space of the path block 15 and the outside space.
- the upper face of this bottom wall 15A is formed with an inclined posture such that the upper face is positioned lower as it extends toward a position closer to the opening 15H.
- a plurality of vertical walls 15F rising from the bottom wall 15A and formed integral with the bottom wall 15A. Reinforcing ribs 15G interconnecting these plurality of vertical walls 15F and the bottom wall 15A are formed as extending radially about the opening 15H.
- the dimension of the vertical wall 15F in the vertical direction is set shorter than the distance from the upper face of the flange body 15C of the path block 15 to the bottom wall 15A.
- a tubular body 15L formed integral with the bottom wall 15A, the tubular body 15L having a cylindrical form and projecting downwards.
- Rib bodies 15M interconnecting this tubular body 15L and the lower face of the bottom wall 15A are formed to extend radially about the opening 15H.
- this tubular portion 16 On the lateral wall of this path block 15, the tubular portion 16 mentioned above is formed. And, this tubular portion 16 is communicated with the interior space of the block body consisting of the bottom wall 15A and the cylindrical wall 15B. Further, an arrangement is provided such that when this path block 15 is connected to the closure member 7, the ventilation opening 7A defined in the closure member 7 is communicated with the interior space of the block body.
- the space surrounded by the vertical walls 15F forms a filter space in which an air filter 17 is to be mounted and a hollow type silencer 18 is formed in the form of a doughnut shape surrounding this filter space.
- a silencer space constituting this silencer 18 and the filter space together form the merging space G.
- the filter space is formed midway in a ventilation path F on the outside air side (the side closer to the opening 15H than the filter space) of the merging space G.
- the silencer space constituting the silencer 18 and the filter space are formed between the outer wall of the closure member 7 and the inner wall of the path block 15.
- the air filter 17 is mounted as being placed in tight contact with the outer wall of the closure member 7 and the inner wall of the path block 15.
- This air filter 17 employs wool felt, paper material, urethane foam, etc. having dust removing property.
- the path block 15 has the interior space that constitutes the fluid path E, the ventilation path F and the merging space G, and also realizes dust removal and moisture removal by the air filter 17 as well as noise reduction by the silencer 18. Further, as the bottom wall 15A of the path block 15 is formed with an inclination, water drops formed inside or moisture removed by the air filter 17 are caused to flow toward the opening 15H along the inclination of the upper face of the bottom wall 15A to be drained through this opening 15H to the outside.
- the downward projection amount of the tubular body 15L is set smaller than the downward projection amount of the head of the fastener bolt 8, thereby to restrict damage to this tubular body 15L.
- an annular groove 2G is formed and a piston ring 30 is fitted with a width narrower than the groove width of the annular groove 2G, with the ring 30 being displaceable within this annular groove 2G along the width direction (the operational direction of the piston 2).
- a piston guide bush 31 is fitted in the outer circumference of the piston 2. In the inner perimeter face of the cylinder 1, the piston ring 30 and the piston guide bush 31 are placed in contact with each other and the outer perimeters at the opposed ends of the piston 2 are placed out of contact with the inner perimeter face of the cylinder 1.
- the annular groove 2 includes a first lateral wall 2Ga on the side of the pressure increasing/decreasing chamber, a second lateral wall 2Gb on the side of the drive chamber, and a bottom wall 2Gc located therebetween and forming the bottom of the annular groove 2G.
- the piston ring 30 has a triple construction formed of an inner ring 30A, an intermediate ring 30B and an outer ring 30C superposed with each other.
- the inner ring 30A is formed of stainless steel and defining a slit at the ring portion.
- the intermediate ring 30B and the outer ring 30C are formed of polytetrafluoroethyelene resin and form a slit at the ring portion, respectively.
- the slits of the inner ring 30A, the intermediate ring 30B and the outer ring 30C do not differ from those ordinarily formed for facilitating extension of the inner diameter when being fitted in the annular groove 2G.
- the position of the slit of the intermediate slit 30B is set with 180 degree angular difference, and relative to this position of the slit of the intermediate ring 30B, the slit of the outer ring 30C is set with 180 degree angular difference.
- This piston ring 30 is subject to an urging force for increasing the radius of the inner ring 30A. And, with this urging force, the outer perimeter of the outer ring 30C is placed into contact with the inner perimeter face of the cylinder 1 and a gap is formed between the inner perimeter face of the inner ring 30A and the bottom wall 20Gc of the annular groove 2G.
- a plurality of communication holes 2T are formed for establishing communication between the bottom wall 2Gc of the annular groove 2G and the interior of the piston 2.
- the communication holes 2T are communicated with the drive chamber B.
- the piston ring 30 is displaced toward the first lateral wall 2Ga to eventually come into contact with this first lateral wall 2Ga, thus blocking flow of air from the pressure increasing/decreasing chamber A toward the communication holes 2T.
- the piston 2 is operated in the discharging direction, as illustrated in Fig.
- this piston ring 30 is displaced toward the second lateral wall 2Gb to eventually come into contact with this second lateral wall 2Gb, thus forming a gap between this piston ring 30 and the first lateral wall 2G; hence, the flow of air from the pressure increasing/decreasing chamber A toward the communication holes 2T is allowed.
- the piston ring 30 is displaced to the position in contact (gapless contact) with the first lateral wall 2Ga, thus blocking the flow of air from the pressure increasing/decreasing chamber A toward the drive chamber B.
- the intake valve 22 is opened to suck the air from the tube 25 into the pressure increasing/decreasing chamber A to provide a negative pressure, whereby the air of the drive chamber B is fed via the ventilation opening 7A into the ventilation path F and discharged via the opening 15H to the outside of the pump.
- the discharge valve 23 is opened to send the air from the pressure increasing/decreasing chamber A to the fluid path E.
- the piston ring 30 is displaced to the position in contact with the second lateral wall 2Gb, so that the air of the pressure increasing/decreasing chamber A is sent via the gap between the piston ring 30 and the first lateral wall 2Ga to the communication holes 2T.
- the drive chamber B reaches a negative pressure condition.
- the degree of the negative pressure is low; hence, the amount of air drawn via the ventilation opening 7A into the drive chamber B is reduced.
- the ventilation path F for feeding air to the communication opening 7A is merged with the fluid path E (discharge path) in the merging space G, it is possible to feed the air from the fluid path E (discharge path) to the ventilation path F.
- the air of the fluid path E (discharge path) and the air drawn via the opening 15H will be mixed.
- the amount of ambient air to be drawn can be reduced.
- air filtered through the air filter 17 will be sucked.
- dust and/or moisture (water content) will be removed by the air filter 17 and will not enter the drive chamber B.
- a reciprocating type compressor as an example of a fluid pump, comprises a piston 2 mounted inside a cylinder 1 to be movable back and forth therein, a pressure increasing/decreasing chamber A formed on the side of the cylinder head relative to the piston 2, and a drive chamber B formed opposite the pressure increasing/decreasing chamber A relative to the piston 2 and accommodating a crank mechanism C for transmitting a drive force to the piston 2.
- this compressor in operation, when the piston 2 is operated in a sucking direction (to the right-hand side in Fig. 6 ), air as a fluid is sucked into the pressure increasing/decreasing chamber A. When the piston 2 is operated in an discharging direction (to the left-hand side in Fig. 1 ), compressed air as a fluid is discharged from the pressure increasing/decreasing chamber A to the outside.
- this compressor can be used for a gas other than air as the fluid.
- the arrangement of the valve unit V differs and the compressor differs also in that the piston 2 does not have the communication holes 2T.
- the rest of the arrangement is identical to that of the first embodiment.
- valve unit V is disposed at one end (the side of cylinder head) of the cylinder 1
- a pressure increasing/decreasing chamber A is formed between this valve unit V and the piston 2.
- a pump housing 3 is disposed at the other end of the cylinder 1, a drive chamber B is formed by the interior space of this pump housing 3.
- the pump housing 3 mounts an electric motor 4, and to a crank arm 5 rotatable together with an output shaft 4A of this electric motor 4, a base end of a connecting rod 6 is connected. And, the piston 2 is operably connected to the leading end of this connecting rod 6.
- the crank mechanism C includes the crank arm 5 and the connecting rod 6.
- the drive chamber B is configured such that a space opened laterally in the pump housing 3 is closed by a plate-like closure member 7.
- This closure member 7 defines a ventilation opening 7A.
- a path block 15 having an interior space communicated with this ventilation opening 7A is mounted on the outer side of the closure chamber 7. And, this path block 15 and the closure member 7 are fixedly connected to the pump housing 3 with a fastener bolt 8. Further, a tubular portion 16 communicated with the interior space of the path block 15 is provided in the form of a projection from the path block 15 toward the valve unit V.
- the valve unit V includes an intake valve 22 mounted at a position thereof communicated with a sucking space 21A (an example of "a feeding/discharging space") of a valve body 21 and a discharge valve 23 at a portion communicated with a discharging space 21 B (an example of "a control space") of this valve body 21.
- the valve unit V further includes a cover plate 24 for isolating the sucking space 21 A and the discharging space 21 B from the outside. To this cover plate 24, there is connected a tube 25 for feeding compressed air from the pressure increasing/decreasing chamber A to an external pressurizing object (an example of "a pressurizing/depressurizing object”).
- the intake valve 22 is formed of a material such as rubber or a resin which is flexibly deformable.
- the discharge valve 23 is configured to be urged by a spring 23S toward its closing direction. Then, when the air flow is to be blocked, with the urging force of the spring 23S, the outer perimeter of the discharge valve 23 is placed into tight or gapless contact with the valve body 21. When the air flow is to be allowed, the outer perimeter will float off the valve body 21 against the urging force of the spring 23S to form a space for allowing the air flow.
- the valve body 21 includes a tubular projecting portion 26 communicated with the sucking space 21A, with the projecting portion 26 projecting toward the pump housing 3.
- a tubular connecting pipe 9 is provided for interconnecting this projecting portion 26 and the tubular portion 16 under a mutually communicated state, and this connecting pipe 9 has one end thereof fitted on the projecting portion 26 and the other end thereof fitted on the tubular portion 16.
- the valve unit V is connected to the pump housing 3 in such a manner that the leading ends of connecting bolts 10 inserted to through holes of the valve body 21 and the cover plate 24 are threaded into female thread portions of the pump housing 3. This connection is done with a plurality of connecting bolts 10. At the time of this connection, the cylinder 1 will be bound between the valve unit V and the pump housing 3 and the connecting pipe 9 is bound between the valve unit V and the path block 15, whereby these components are united together.
- a ventilation path F is formed to extend from the ventilation opening 7A through the interior space of the path block 15 to be communicated with an opening 15H defined in the outer face of the path block 15.
- a fluid path E functioning as an intake path, is formed to extend from the sucking space 21 A of the valve body 21 through the connecting pipe 9 to be communicated with the interior space of the path block 15. This fluid path E is merged in a merging space G formed at an intermediate position of the ventilation path F, and an air filter 17 (an example of "a fluid filter”) is mounted in this merging space G.
- the space surrounded by the vertical walls 15F forms a filter space in which the air filter 17 is to be mounted and a hollow type silencer 18 is formed in the form of a doughnut shape surrounding this filter space.
- a silencer space constituting this silencer 18 and the filter space together form the merging space G.
- the filter space is formed midway in a ventilation path F on the outside air side (the side closer to the opening 15H than the filter space) of the merging space G.
- the silencer space constituting the silencer 18 and the filter space are formed between the outer wall of the closure member 7 and the inner wall of the path block 15.
- the air filter 17 is mounted as being placed in tight contact with the outer wall of the closure member 7 and the inner wall of the path block 15.
- This air filter 17 employs wool felt, paper material, urethane foam, etc. having dust removing property.
- the path block 15 has the interior space that constitutes the fluid path E, the ventilation path F and the merging space G, and also realizes dust removal and moisture removal by the air filter 17 as well as noise reduction by the silencer 18. Further, as the bottom wall 15A of the path block 15 is formed with an inclination, water drops formed inside or moisture removed by the air filter are caused to flow toward the opening 15H along the inclination of the upper face of the bottom wall 15A to be drained through this opening 15H to the outside.
- this piston ring 30 has a construction formed by superposing a plurality of rings from the inner side to the outer side. And, the outermost ring employs polytetrafluoroethyelene resin.
- a piston guide bush 31 is fitted therein, and in the inner perimeter face of the cylinder 1, the piston ring 30 and the piston guide bush 31 are placed in contact with each other and the outer perimeters at the opposed ends of the piston 2 are out of contact with the inner perimeter face of the cylinder 1.
- the discharge valve 23 is opened whereby the air from the pressure increasing/decreasing chamber A is fed to the tube 25. Simultaneously therewith, a negative pressure is developed in the drive chamber B.
- ambient air is fed via the opening 15H to the ventilation path F and sucked into the drive chamber B and also a portion of the air of the fluid path E is sucked as being merged in the merging space G. That is, when the piston 2 is operated in the discharging direction, the fluid path E is placed out of communication with the pressure increasing/decreasing chamber A, but when the drive chamber B reaches a negative pressure, air can be sent out like a chamber.
- the amount of air to be sucked from the outside space can be reduced. Further, since the ambient air to be sucked into the drive chamber B is always filtered through the air filter 17, dust and/or moisture (water content) are removed by the air filter 17 and will not enter the drive chamber B.
- the present invention may be used for fluid pumps in general that are configured such that a piston is operated inside a cylinder.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011125555 | 2011-06-03 | ||
JP2011242693A JP5748106B2 (ja) | 2011-06-03 | 2011-11-04 | 流体ポンプ |
PCT/JP2012/064173 WO2012165582A1 (ja) | 2011-06-03 | 2012-05-31 | 流体ポンプ |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2733353A1 true EP2733353A1 (de) | 2014-05-21 |
EP2733353A4 EP2733353A4 (de) | 2015-07-01 |
EP2733353B1 EP2733353B1 (de) | 2016-05-18 |
Family
ID=47259434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12793012.1A Active EP2733353B1 (de) | 2011-06-03 | 2012-05-31 | Flüssigkeitspumpe |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140112812A1 (de) |
EP (1) | EP2733353B1 (de) |
JP (1) | JP5748106B2 (de) |
CN (1) | CN203742952U (de) |
WO (1) | WO2012165582A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3051136B1 (de) * | 2015-01-29 | 2020-04-01 | Pfeiffer Vacuum Gmbh | Vakuumpumpe |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016086073A2 (en) * | 2014-11-24 | 2016-06-02 | Huntleigh Technology Limited | Moisture control coverlet |
JP6714971B2 (ja) * | 2015-02-10 | 2020-07-01 | ナブテスコオートモーティブ株式会社 | 真空ポンプ |
TWI570329B (zh) * | 2015-02-13 | 2017-02-11 | Wen-San Chou | 空氣壓縮機之壓縮筒出氣構造改良 |
TWI580867B (zh) * | 2015-03-03 | 2017-05-01 | 周文三 | 空氣壓縮機之構造改良 |
TWI608168B (zh) * | 2016-01-18 | 2017-12-11 | 周文三 | 空氣壓縮機之汽缸出氣結構改良 |
TWI644021B (zh) * | 2016-02-26 | 2018-12-11 | 周文三 | 空氣壓縮機之汽缸出氣結構改良 |
JP6628888B2 (ja) * | 2016-03-07 | 2020-01-15 | ニュモテク株式会社New Motech Co., Ltd. | 小型空気圧縮機 |
US10760557B1 (en) * | 2016-05-06 | 2020-09-01 | Pumptec, Inc. | High efficiency, high pressure pump suitable for remote installations and solar power sources |
EP3875762A4 (de) * | 2018-10-31 | 2022-08-17 | Shiqing Li | Elektrisches haushaltsgerät mit hoch-/niederdruckfunktion |
CN114837792A (zh) | 2021-03-10 | 2022-08-02 | 美普盛(上海)汽车零部件有限公司 | 一种带膨胀补偿密封件的电动冷却液泵 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1415183A (fr) * | 1964-11-21 | 1965-10-22 | Bosch Gmbh Robert | Machine telle que compresseur, notamment pour la production d'air comprimé ou autres applications |
JPS564693U (de) * | 1979-06-20 | 1981-01-16 | ||
US4679994A (en) * | 1981-03-09 | 1987-07-14 | Allied Corporation | Piston vacuum pump |
JPH0631615B2 (ja) * | 1986-12-16 | 1994-04-27 | 三菱電機株式会社 | ガス圧縮機 |
JPH0547375U (ja) * | 1991-11-13 | 1993-06-22 | 株式会社共立 | エンジンコンプレッサ |
JP3017123B2 (ja) | 1997-03-24 | 2000-03-06 | 帝国ピストンリング株式会社 | 圧縮機 |
US7654283B2 (en) * | 2003-10-21 | 2010-02-02 | Seiko Epson Corporation | Check valve and pump including check valve |
BE1016727A4 (nl) * | 2005-08-17 | 2007-05-08 | Atlas Copco Airpower Nv | Verbeterde inrichting voor het regelen van het debiet van een mobiele oliegeinjecteerde schroefcompressor. |
US8322271B2 (en) * | 2007-07-02 | 2012-12-04 | Brewl Technologies, Inc. | Infusible material capsule for brewing a beverage |
DE102007042318B4 (de) * | 2007-09-06 | 2017-11-30 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Kompakter trockenlaufender Kolbenverdichter |
JP5477614B2 (ja) * | 2008-05-23 | 2014-04-23 | アイシン精機株式会社 | 弁構造 |
JP2011007118A (ja) | 2009-06-26 | 2011-01-13 | Aisin Seiki Co Ltd | 真空ポンプ |
-
2011
- 2011-11-04 JP JP2011242693A patent/JP5748106B2/ja active Active
-
2012
- 2012-05-31 EP EP12793012.1A patent/EP2733353B1/de active Active
- 2012-05-31 US US14/123,579 patent/US20140112812A1/en not_active Abandoned
- 2012-05-31 WO PCT/JP2012/064173 patent/WO2012165582A1/ja active Application Filing
- 2012-05-31 CN CN201290000573.9U patent/CN203742952U/zh not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3051136B1 (de) * | 2015-01-29 | 2020-04-01 | Pfeiffer Vacuum Gmbh | Vakuumpumpe |
Also Published As
Publication number | Publication date |
---|---|
EP2733353A4 (de) | 2015-07-01 |
US20140112812A1 (en) | 2014-04-24 |
JP5748106B2 (ja) | 2015-07-15 |
WO2012165582A1 (ja) | 2012-12-06 |
JP2013011268A (ja) | 2013-01-17 |
CN203742952U (zh) | 2014-07-30 |
EP2733353B1 (de) | 2016-05-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2733353B1 (de) | Flüssigkeitspumpe | |
KR101628674B1 (ko) | 모터 펌프 조립체 | |
US8585372B2 (en) | Motor/pump assembly | |
CN101384459B (zh) | 电机泵组 | |
US20080240944A1 (en) | Air-Operated Pump | |
TW201520417A (zh) | 潤滑劑排放系統 | |
CN103492781B (zh) | 往复式空气马达及用于其的端盖组件和从往复式空气马达中的阀杆上除去污染物的方法 | |
US20110194959A1 (en) | Oil pump with air vent structure | |
EP1813810B1 (de) | Kolbenpumpenhinterteil mit Luftbälgen | |
CN102656070A (zh) | 马达-泵单元 | |
GB2452139A (en) | Check valve | |
US10844853B2 (en) | Intake pulsation damper of swash plate-type compressor | |
US20140044567A1 (en) | Reciprocating pump valve assembly with thermal relief | |
US20060110266A1 (en) | Compressor provided with an oil separator | |
CN109690077B (zh) | 往复式压缩机 | |
EP2058517B1 (de) | Pumpe | |
JP5691857B2 (ja) | 気体ポンプ | |
JP2008088878A (ja) | 往復動圧縮機 | |
WO2012165581A1 (ja) | 真空ポンプ | |
CN212360068U (zh) | 一种凡尔液压浆体输送泵 | |
JP2012251501A (ja) | 真空ポンプ | |
US9028681B2 (en) | Drainage device for closed chamber containing liquid | |
CN213176227U (zh) | 一种整体式电液动推杆 | |
EP4116550B1 (de) | Ventil zur verhinderung von rückfluss | |
EP3601776A1 (de) | Kraftstoffpumpe zur zuführung vin kraftstoff an einen kolbenverbrennungsmotor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20140103 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
RA4 | Supplementary search report drawn up and despatched (corrected) |
Effective date: 20150602 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04B 39/12 20060101AFI20150527BHEP |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20151204 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 5 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Ref country code: AT Ref legal event code: REF Ref document number: 800740 Country of ref document: AT Kind code of ref document: T Effective date: 20160615 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602012018719 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20160518 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160818 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 800740 Country of ref document: AT Kind code of ref document: T Effective date: 20160518 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160919 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160819 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602012018719 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 6 |
|
26N | No opposition filed |
Effective date: 20170221 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20160818 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160818 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20120531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: MT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160531 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20160518 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R084 Ref document number: 602012018719 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20230411 Year of fee payment: 12 Ref country code: DE Payment date: 20230404 Year of fee payment: 12 |