US3597121A - Air-driven hydraulic pump - Google Patents

Air-driven hydraulic pump Download PDF

Info

Publication number
US3597121A
US3597121A US4271A US3597121DA US3597121A US 3597121 A US3597121 A US 3597121A US 4271 A US4271 A US 4271A US 3597121D A US3597121D A US 3597121DA US 3597121 A US3597121 A US 3597121A
Authority
US
United States
Prior art keywords
piston
fluid
bore
chamber
control valve
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.)
Expired - Lifetime
Application number
US4271A
Other languages
English (en)
Inventor
Samuel B Mcclocklin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Owatonna Tool Co
Original Assignee
Owatonna Tool Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Owatonna Tool Co filed Critical Owatonna Tool Co
Application granted granted Critical
Publication of US3597121A publication Critical patent/US3597121A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L21/00—Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F01L25/066—Arrangements with main and auxiliary valves, at least one of them being fluid-driven piston or piston-rod being used as auxiliary valve
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/123—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber
    • F04B9/127—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting elastic-fluid motor, e.g. actuated in the other direction by gravity or a spring

Definitions

  • control valve is mounted in an end of a bore while in others, the control valve is mounted for movement with the piston.
  • Various porting arrangements which may include the use of pilot valves are utilized to shift the control valve.
  • the principal object of the invention is to provide a new and improved fluid-actuated hydraulic pump. More specifically, it is an object ofthe invention to provide such a pump that is extremely compact and wherein inertia problems encountered with the control valve are overcome by positively holding the control valve in a piston-venting position until the return stroke of the piston under the influence of a spring is completed.
  • the exemplary embodiment of the invention contemplates the use of a bore receiving a reciprocally mounted piston 2 which is connected to a reciprocally operating member of a hydraulic pump. One end of the bore is connected to a source of fluid under pressure while the other end of the bore is connected to an exhaust vent or fluid outlet.
  • a control valve is mounted for movement within a chamber formed in the piston itself and is movable between a first position wherein the inlet end of the bore is vented to permit the venting of the piston and the spring return of the same and a second position wherein no fluid communication from the inlet end of the bore to the vent is permitted so that the fluid under pressure will drive the piston through a power stroke.
  • the positive holding means include a means for trapping a column of fluid behind a control surface of the control valve from the beginning of the return stroke until the end thereof. This is accomplished by porting one end of the control valve to the side of the piston in such a way that for all locations of the piston within the bore between the end of the power stroke and the position of initiation thereof, the fluid behind the control valve cannot escape.
  • the bore includes a channel which opens into the bore at two spaced locations so that at the end of a power stroke, fluid under pressure is applied against the previously mentioned surface of the control valve to shift the same to the piston-venting position and also to vent the control valve surface thereby relieving the trapped column of fluid when the piston is fully returned by the spring so that the control valve may be closed in readiness for the initiation of another power stroke.
  • the piston itself is utilized as a valve member to control the flow of fluid through the channel.
  • sealing means carried by the piston and in sealing engagement with the bore flank the porting to the side of the piston of the control valve chamber.
  • FIG. I is a vertical section of a fluid-actuated hydraulic pump made according to the invention illustrating the pump configuration at the initiation of a power stroke;
  • FIG. 2 is a vertical section of a fluid-actuated hydraulic pump illustrating the configuration of the same just prior to the completion of the power stroke;
  • FIG. 3 is a vertical section of a fluid-actuated hydraulic pump showing the configuration of the same at the termination of the power stroke
  • FIG. 4 is a vertical section of a fluid-actuated hydraulic pump during the return stroke.
  • an exemplary embodiment of a fluid-actuated hydraulic pump made according to the invention is seen to comprise a housing, generally designated 10, in which is located an air motor, generally designated 12, and a hydraulic pump, generally designated 14.
  • the hydraulic pump 14 the same is seen to comprise a casting 16 including a threaded bore 18 which receives a ball valve member 20 which is operative to permit hydraulic fluid to be admitted to the pump 14 during the return stroke of the motor 12 through a passage 22 adapted to be connected to any suitable source of hydraulic fluid.
  • the ball valve is operable to preclude the passage of hydraulic fluid during the power stroke of the motor 12 as will be seen.
  • the casting 16 further includes a bore 24 which receives a spring loaded check valve member 26 which has a passage 28 communicating with an outlet 30 through which hydraulic fluid under pressure may flow to a point of use.
  • the casting 16 further includes a bore 32 which is in fluid communication with both the valve 20 and the valve 26 and which threadingly receives a cylinder 34 having a bore 36 in which is reciprocally received a pump piston 38. Reciprocation of the pump piston 38 within the bore 36 to the right viewed in FIG. 1 will cause such fluid as may be located in the bore 36 and the bore 32 to open the spring loaded check valve 26 and pass, under pressure, to the outlet 30. Reciprocation of the piston 38 to the left as viewed in FIG. 1 will permit ball valve 20 to open and draw hydraulic fluid into the bore 32 and the bore 36.
  • Suitable packing 40 may be located about bore 36 to provide a seal.
  • the air motor 12 includes a central bore 42 in which is received a piston 44.
  • the piston 44 is connected to the pump piston 38 by securing means 46 so that reciprocation of the piston 44 will result in the reciprocation of the pump piston 33 and the delivery of hydraulic fluid under pressure to the outlet 30.
  • a coil spring 48 bears against one side of the piston 44 and against the casting 16 in such a way as to normally urge the piston 44 to the left as viewed in FIG. I. As will be seen, the spring 48 acts to return the piston 44 to the position illustrated in FIG. 1 after each power stroke.
  • a block 50 having a fluid inlet 52 which may be connected to a source of air under pressure or the like.
  • the inlet 52 is connected by means of a conduit 54in the block 50 and a conduit 56 in the air motor casing to the center of one end of the bore 42.
  • a manually actuable valve member 58 including a valve element 60 which is normally urged by a spring 62 against a valve seat 64 to preclude fluid under pressure provided to the inlet 52 from travelling to the bore 42.
  • a manual actuator 66 may be pivotally mounted to the housing 10 by any suitable means not shown and, when pivoted downwardly, is operative to move the valve element 60 away from the seat 64 and-against the bias of the spring 62 so that fluid under pressure will be provided to the interior of the bore 42.
  • the piston 44 includes a valve chamber 68 having one end 70 communicating with the side of the piston 44 by means of a port 7 2.
  • the valve chamber 68 also includes a central portion 74 of reduced diameter which is in fluid communication with the right-hand side of the piston 44 by means of a port 76.
  • the chamber 68 includes a second end portion 78 defined by three guide prongs 80 extending from the left-hand side of the piston 44 so that, under circumstances to be seen hereinafter, fluid communication between the left-hand end of the piston 44 and the central portion 74 may be had.
  • the valve 82 Received within the chamber 68 is a control valve member in the form of a pilot-operated guided poppet valve 82,
  • the valve 82 includes a central, reduced diameter portion 84 which has a diameter less than that of the reduced diameter portion 74 of the chamber 68.
  • the valve 82 further includes an enlarged end within the chamber end 70 and an enlarged soft poppet 88 within the end portion 78.
  • the surface area of the enlarged end 86 is made greater than the surface area of the poppet 88' so that when equal pressures are applied to both ends of the valve 82, the same will shift to the left as viewed in FIG. 3.
  • the poppet includes an annular seat 89 designed to seat against the end of the casting 12 about the point of emergence of the conduit 56.
  • the right-hand end of the bore 42 is normally connected to exhaust by means of a port 90 opening through the casting 16 to the end of the bore 42.
  • the port 90 is in fluid communication with a port 92 which may be formed in a block 94 and which additionally may include a suitable mounting for the check valve 26 and the outlet 30.
  • a muffler 98 may be interposed between the ports 90 and 92 to minimize noise due to exhaust fluid.
  • an external muffler connected to the port 96 could be substituted therefor.
  • a channel 100 which opens at spaced locations, as at 102 and 104, into the bore 42. If desired, the material separating the openings 102 and 104 can be omitted and the channel 100 formed merely as a groove in the wall of the bore 42.
  • the conduction of fluid through the channel 100 is controlled by the position of the piston within the bore 42. The arrangement is also such that alternate ones of the ends of the channel may be in fluid communication with the port 72 associated with the right-hand end 70 of the valve chamber 68.
  • the piston carries sealing means 106 and 108 in grooves 110 therein.
  • the arrangement is such that the sealing means 106 and 108, which sealingly engage both the piston and the bore 14, flank the port 72 as it emerges from the interior of the piston 44 to the side thereof.
  • the opening 104 of the channel 100 will be uncovered by the piston 44 so that fluid under pressure will be provided to the channel 100.
  • the opening 102 will be in fluid communication with the port 72 in the piston so that fluid under pressure will be applied against the end 86 of the valve 82 by virtue of its conduction to the chamber end 70 by the port 72.
  • the pressure of the. fluid applied against both the end 86 and the poppet 88 of the valve 82 will be the same, because of the larger effective area of the end 86, the valve 82 will shift to the left to result in the alignment of parts illustrated in FIG. 2.
  • a fluid-actuated hydraulic pump made according to the invention provides a number of advantages over those prior art constructions mentioned previously.
  • the mounting of the control valve 82 in the piston 44 itself does not require an extra thickness in a wall of the air motor 12 thereby diminish ing space requirements.
  • the positive holding of the spool valve 82 in the venting position during the return stroke precludes partial shifting of the same due to inertial effects as the piston moves from its position at the end of a power stroke to a position at the end of the return stroke. Accordingly, the efficiency of the pump is significantly increased.
  • a fluid-actuated hydraulic pump including a hydraulic pump having a reciprocally operable pumping member; a fluid motor including a housing having a bore containing a reciprocal piston movable between a retracted position and an extended position and connected to said pumping member, a fluid inlet through which fluid under pressure may be admitted into the bore to drive the piston towards said extended position, spring means for driving the piston towards said retracted position, and a fluid outlet for exhausting fluid within the bore to permit the spring means to drive the piston towards said retracted position, a control valve alternately movable between a closed position wherein fluid under pressure from said inlet drives said piston toward the extended position and an open position wherein said bore is connected to said fluid outlet to permit movement of the piston to said retracted position by said spring to thereby reciprocate the pump member; and control means responsive to the piston in the retracted position for shifting the control valve to the closed position and responsive to the piston in the extended position for shifting the control valve to the open position; the improvement which comprises: means for positively holding said control valve in
  • a fluid-actuated hydraulic pump according to claim 1 wherein said control valve is fluid operated in moving from said closed position to said open position and includes a surface subjectable to fluid under pressure to move said control valve from the closed position to the open position, and said positive holding means comprises means for trapping a column of fluid behind said surface while said piston is moving from the extended position to the retracted position.
  • a fluid-actuated hydraulic pump according to claim 2 wherein said trapping means comprises port means in fluid communication with said surface and closeable by said piston when said piston is between said retracted and extended positions and openable by said piston when said piston is in the retracted position.
  • a fluid-actuated hydraulic pump wherein said control valve is carried by said piston in a chamber therein and said port means includes a first channel extending from said chamber to a side of the piston and a second channel in said housing opening into said bore at two spaced points therein.
  • a fluid-actuated pump comprising:
  • a valve chamber in said piston having one end thereof ported to the side of said piston, the other end thereof ported to said bore one end, and a portion ported to said bore other end.
  • a control valve member movable within said chamber for alternatively allowing fluid communication between said portion and said chamber other end in one position thereof to establish fluid communication between the two ends of the bore and to preclude fluid communication between said portion and said chamber other end in another position thereof, said valve further including a fluid-operated surface facing said chamber one end, and
  • channel means associated with said bore for establishing fluid communication between said bore one end and said chamber one end when said piston approaches said bore other end.
  • a fluid-actuated hydraulic pump according to claim 5 wherein said channel means is arranged with respect to said bore so fluid communication is established between said chamber one end and said bore other end as said piston approaches said bore one end, and fluid communication with said chamber one end is precluded whenever said piston is not approaching either end of said bore to thereby trap a column of fluid behind said surface when said piston moves from said bore other end to positively hold said valve in a position establishing fluid communication between the ends of said bore when the piston is travelling from said bore other end toward said bore one end.
  • control valve is a spool valve having a reduced diameter central portion, with the spool end within said chamber one end having a larger surface area than the other spool end, said portion of said chamber having a reduced diameter larger than the reduced diameter of said spool portion, said chamber one end being ported to one side of said piston at about the midpoint thereof, and further including sealing means on said piston sealingly engaging said piston and said bore and flanking the port of said chamber one end, said channel means opening into said bore at spaced locations therein.
  • a fluid-actuated hydraulic pump comprising: a hydraulic pump having a reciprocally operable pump member; a fluid motor including a housing having a bore containing a reciprocal piston movable between a retracted position and an extended position and connected to said pumping member; a fluid inlet through which fluid under pressure may be admitted into the bore to drive the piston towards its extended position; spring means for driving the piston towards its retracted position; a fluid outlet for exhausting fluid within the bore to permit the spring means to drive the piston towards said retracted position; a valve chamber in said piston; a fluid-actuated control valve within said chamber alternately movable between a closed position wherein fluid under pressure from said inlet drives said piston toward the extended position and an open position wherein said bore is connected to said fluid outlet to permit movement of the piston to the retracted position by said spring means to thereby reciprocate the pump member; and control means responsive to the piston in the retracted position for shifting the control valve to the closed position thereof and responsive to the piston in the extended position to shift, by fluid under pressure,
  • said port means is arranged to establish fluid commu- 9v A fluid-actuated hydraulic pump according to claim 8 nication between said inlet and said valve chamber when said further including sealing means carried by the i t d piston is in said extended position and between said outlet and gaging the bore, said sealing means being locaed on said said valve chamber when said piston is in said retracted posipiston so as to flank both sides of the opening of said port to the side of said piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Mechanically-Actuated Valves (AREA)
US4271A 1970-01-20 1970-01-20 Air-driven hydraulic pump Expired - Lifetime US3597121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427170A 1970-01-20 1970-01-20

Publications (1)

Publication Number Publication Date
US3597121A true US3597121A (en) 1971-08-03

Family

ID=21709983

Family Applications (1)

Application Number Title Priority Date Filing Date
US4271A Expired - Lifetime US3597121A (en) 1970-01-20 1970-01-20 Air-driven hydraulic pump

Country Status (6)

Country Link
US (1) US3597121A (enrdf_load_stackoverflow)
CA (1) CA927676A (enrdf_load_stackoverflow)
DE (1) DE2102591A1 (enrdf_load_stackoverflow)
FR (1) FR2075721A5 (enrdf_load_stackoverflow)
GB (1) GB1288522A (enrdf_load_stackoverflow)
SE (1) SE370265B (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788781A (en) * 1972-03-17 1974-01-29 Owatonna Tool Co Hydraulic system
DE3111065A1 (de) 1980-05-12 1982-03-04 Owatonna Tool Co., 55060 Owatonna, Minn. Luft-hydraulikpumpe
DE3238421A1 (de) * 1981-10-17 1983-05-05 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Foerdereinrichtung fuer fluessige oder gasfoermige medien
US4889088A (en) * 1987-12-16 1989-12-26 Pradom Limited Fluid flow control method and apparatus for a positive displacement engine or compressor
US5341723A (en) * 1993-04-20 1994-08-30 Michael Hung Reciprocating pneumatic motor for hydraulics
ES2071588A2 (es) * 1993-11-16 1995-06-16 Michael Hung Motor neumatico de movimiento alternativo para hidraulica.
US5464330A (en) * 1993-03-09 1995-11-07 Applied Power Inc. Cyclic hydraulic pump improvements
US6012377A (en) * 1998-02-13 2000-01-11 Hung; Michael Shuttle valve of a reciprocating pneumatic motor for hydraulics
US6736292B2 (en) 2002-03-01 2004-05-18 Lincoln Industrial Corporation Pneumatic reciprocating motor and grease gun incorporating same
US20040115069A1 (en) * 2002-12-12 2004-06-17 Jeng-Shiung Huang Air actuated hydraulic pump
US20040129735A1 (en) * 2002-03-01 2004-07-08 Lincoln Industrial Corporation Pump with pneumatic motor
US7147442B2 (en) * 2003-05-22 2006-12-12 Kuo-Chung Yeh Automatic oil pump, with a valved pumping piston and a valved driving piston unit
US20090155093A1 (en) * 2006-02-10 2009-06-18 Lincoln Gmbh Hydraulic device with a lubricating pump
US20100215521A1 (en) * 2006-11-21 2010-08-26 Knuth Bruce E Air driven hydraulic pump
CN102812246A (zh) * 2010-01-29 2012-12-05 英格索尔-兰德公司 具有带关节端的落管的空气马达
US8424848B1 (en) * 2003-06-16 2013-04-23 Melvin L. Hawkins, Jr. Vehicle jack for use on vehicles to change tires and for other purposes
US20190203744A1 (en) * 2017-12-28 2019-07-04 Shinn Fu Corporation Reduced noise reciprocating pneumatic motor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204260C2 (de) * 1972-01-29 1985-04-04 Pneumo Dynamics Corp., Cleveland, Ohio Kolbenpumpe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965038A (en) * 1931-09-02 1934-07-03 Aro Equipment Corp Fluid motor
US2254716A (en) * 1941-04-17 1941-09-02 John J Veit Fluid pressure motor for grease guns

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965038A (en) * 1931-09-02 1934-07-03 Aro Equipment Corp Fluid motor
US2254716A (en) * 1941-04-17 1941-09-02 John J Veit Fluid pressure motor for grease guns

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788781A (en) * 1972-03-17 1974-01-29 Owatonna Tool Co Hydraulic system
DE3111065A1 (de) 1980-05-12 1982-03-04 Owatonna Tool Co., 55060 Owatonna, Minn. Luft-hydraulikpumpe
US4352644A (en) * 1980-05-12 1982-10-05 Owatonna Tool Company Air-hydraulic pump
DE3238421A1 (de) * 1981-10-17 1983-05-05 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Foerdereinrichtung fuer fluessige oder gasfoermige medien
US4889088A (en) * 1987-12-16 1989-12-26 Pradom Limited Fluid flow control method and apparatus for a positive displacement engine or compressor
US5464330A (en) * 1993-03-09 1995-11-07 Applied Power Inc. Cyclic hydraulic pump improvements
US5341723A (en) * 1993-04-20 1994-08-30 Michael Hung Reciprocating pneumatic motor for hydraulics
ES2071588A2 (es) * 1993-11-16 1995-06-16 Michael Hung Motor neumatico de movimiento alternativo para hidraulica.
US6012377A (en) * 1998-02-13 2000-01-11 Hung; Michael Shuttle valve of a reciprocating pneumatic motor for hydraulics
US6736292B2 (en) 2002-03-01 2004-05-18 Lincoln Industrial Corporation Pneumatic reciprocating motor and grease gun incorporating same
US6923348B2 (en) 2002-03-01 2005-08-02 Lincoln Industrial Corporation Pump with pneumatic motor
US20040129735A1 (en) * 2002-03-01 2004-07-08 Lincoln Industrial Corporation Pump with pneumatic motor
US6860727B2 (en) * 2002-12-12 2005-03-01 Tai Lio Enterprise Co., Ltd. Air actuated hydraulic pump
US20040115069A1 (en) * 2002-12-12 2004-06-17 Jeng-Shiung Huang Air actuated hydraulic pump
US7147442B2 (en) * 2003-05-22 2006-12-12 Kuo-Chung Yeh Automatic oil pump, with a valved pumping piston and a valved driving piston unit
US8424848B1 (en) * 2003-06-16 2013-04-23 Melvin L. Hawkins, Jr. Vehicle jack for use on vehicles to change tires and for other purposes
US20090155093A1 (en) * 2006-02-10 2009-06-18 Lincoln Gmbh Hydraulic device with a lubricating pump
US8087902B2 (en) * 2006-02-10 2012-01-03 Lincoln Gmbh Hydraulic device with a lubricating pump
US20100215521A1 (en) * 2006-11-21 2010-08-26 Knuth Bruce E Air driven hydraulic pump
US8496449B2 (en) 2006-11-21 2013-07-30 Actuant Corporation Air driven hydraulic pump
CN102822522A (zh) * 2010-01-29 2012-12-12 英格索尔-兰德公司 装有陶瓷阀的空气马达
CN102812246A (zh) * 2010-01-29 2012-12-05 英格索尔-兰德公司 具有带关节端的落管的空气马达
CN102812246B (zh) * 2010-01-29 2015-01-28 英格索尔-兰德公司 具有带关节端的落管的空气马达
CN102822522B (zh) * 2010-01-29 2015-03-25 英格索尔-兰德公司 装有陶瓷阀的空气马达
US20190203744A1 (en) * 2017-12-28 2019-07-04 Shinn Fu Corporation Reduced noise reciprocating pneumatic motor
US10598196B2 (en) * 2017-12-28 2020-03-24 Shinn Fu Corporation Reduced noise reciprocating pneumatic motor

Also Published As

Publication number Publication date
FR2075721A5 (enrdf_load_stackoverflow) 1971-10-08
DE2102591A1 (de) 1971-07-29
SE370265B (enrdf_load_stackoverflow) 1974-10-07
CA927676A (en) 1973-06-05
GB1288522A (enrdf_load_stackoverflow) 1972-09-13

Similar Documents

Publication Publication Date Title
US3597121A (en) Air-driven hydraulic pump
US6210131B1 (en) Fluid intensifier having a double acting power chamber with interconnected signal rods
US4854832A (en) Mechanical shift, pneumatic assist pilot valve for diaphragm pump
US5558506A (en) Pneumatically shifted reciprocating pump
US4971531A (en) Pump arrangement driven by compressed-air
EP0466764B1 (en) An arrangement for controlling a linear motor
GB1087180A (en) Fluid pressure actuated device
US3776665A (en) Two stage fluid pump
US3687008A (en) Pressure fluid controlled reciprocating mechanism
EP0832359B1 (en) Pneumatic pump
US3112705A (en) Two-speed hydraulic pumps
US3548716A (en) Actuator valve system for two-stage fluid-operated unit
CN110594117B (zh) 一种单头双作用气液增压泵
US3349995A (en) Reciprocating booster pump
GB1500939A (en) Fluid operated motor
US2735404A (en) L- komph
US3179057A (en) Equipment system for producing ultrahigh process pressures
GB1161981A (en) Pneumatic Motor
GB1302086A (enrdf_load_stackoverflow)
US4085655A (en) Control for reciprocating pumps or the like
JP3538426B2 (ja) 直線運動を行う圧力媒体駆動装置
US4410304A (en) Free piston pump
CN108612682A (zh) 一种低噪音液压增压器
US3017862A (en) Control valve assembly for fluid operated systems
EP0067048B1 (en) A pump