US3726185A - Compressed-air pump - Google Patents

Compressed-air pump Download PDF

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Publication number
US3726185A
US3726185A US00124188A US3726185DA US3726185A US 3726185 A US3726185 A US 3726185A US 00124188 A US00124188 A US 00124188A US 3726185D A US3726185D A US 3726185DA US 3726185 A US3726185 A US 3726185A
Authority
US
United States
Prior art keywords
valve body
piston
block
compressed air
bore
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
US00124188A
Other languages
English (en)
Inventor
B Orr
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Application granted granted Critical
Publication of US3726185A publication Critical patent/US3726185A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
    • F01B17/02—Engines
    • 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
    • F01L23/00—Valves controlled by impact by piston, 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
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves

Definitions

  • the supply of compressed air to the motor is controlled by a valve movable between first and second positions in a bore of the block.
  • the block is formed with passageways for supplying compressed air to the piston when it is in one position in the cylinder space and the valve body is in its first position, and for terminating such supply of compressed air when the valve body moves to its second position responsive to the supply of compressed air. In the second position of the valve body communication is established between the cylinder space and the atmosphere.
  • all ofthe compressed air supply passageways are formed in the block and the valve body is characterized by the absence of passageways.
  • passageways are formed in the valve body it becomes a complicated component of the structure and expensive to fabricate.
  • the passageways in the valve body and the arrangement of the passageways in the cylinder head or block there is a tendency for the passageways to clog so that malfunction of the compressed-air motor frequently occurs which is objectionable.
  • a small bearing surface must be relied upon at the immediate vicinity of such passageway. This is alsoobjectionable for the further reason that it is easily deformed when not handled properly and expensive to replace when it cannot be properly aligned with other components of the compressed-air motor.
  • Another object of the invention is to provide such an improved compressed-air motor in which malfunction of the motor is reduced to a minimum and a simple fabricated construction is obtained.
  • valve body which is characterized by the absence of compressed air passageways. This lends itself to the use of inexpensive materials, such as plastics, for example, in the valve body.
  • valve body comprises a rod having an intermediate portion and first and second end portions, the first end portion being removed from the motor piston and the second portion being nearer to the piston.
  • the first end portion includes a resilient member which can be formed of a suitable plastic and is in sealing engagement with the bore of the motor head or block.
  • the second end portion is solid and in sliding engagement with at least av part of the bore.
  • the intermediate portion has a smaller cross-sectional area than that part of the bore with which it coextends.
  • compressed air can be supplied through a passageway in the motor block directly to the cylinder space. This effects movement of the piston which in turn promotes movement of the valve body to a second position.
  • the supply of compressed air to the cylinder space stops and air is discharged from the cylinder space to the atmosphere or ambient air through a path of flow including an exhaust passageway extending to an exterior surface of the motor block from the bore space enveloping the intermediate narrow portion of the valve body.
  • valve body in which a resilient .member is employed which is in sealing engagement with the bore of the motor block an accurate fit of the valve body within the motor block is only required at one region instead of at several regions, as required in the prior art British patent, for example. In this way the components of the compressed-air motor can be accurately aligned and rigidly secured to one another.
  • FIGURE is a vertical sectional view of a compressed-air pump which has a compressed-air motor embodying my invention.
  • the compressed-air pump embodying my invention includes a motor block 10, a cylinder 11 secured thereto and a pump block 12 secured to the cylinder.
  • the motor block 10 has a bore 13 in which a valve body 14 is movable.
  • the valve body 14 includes a slide 15, an intermediate portion 16 and a remote end 17 recessed to receive a resilient seal 18.
  • Both the valve body and the resilient seal are preferably formed from suitable plastic materials.
  • the resilient seal includes a conical collar integrally connected to a bushing 19, the outer peripheral portion of the collar bearing resiliently against the inner wall of the bore 13. Due to the design of the seal great manufacturing tolerances can be permitted for the corresponding portion of the bore 13.
  • the radial extension or cross-sectional area of the intermediate portion 16 is smaller than that of the bore, so that there will be a space 20 between the intermediate portion and the wall of the bore. This space is in communication with the atmosphere through a channel 21.
  • the slide 15 has a conical-shaped portion 22 to which is fixed a thrust head 23. At its other end, the slide is formed with a flat surface 24 which, as shown in the drawing, engages a flat seat 25. This part of the slide 15 is the only region requiring an accurate fit of the valve body.
  • the motor block 10 is provided with an inlet 26 for connecting a compressed air line thereto. From the inlet 26 the compressed air is conducted through a passageway 27 to valve structure 28 including a valve housing 28a in threaded engagement with the motor block 10, a movable operating knob 29, a spring 30 and a ball 31.
  • the valve housing 28a is provided with conventional seals at 28b and 280.
  • the passageway 34 opens directly into the cylinder 11 and the conical-shaped portion 22 p of the slide serves as a guiding surface for the compressed air.
  • a piston 36 moves forward and backward in the cylinder 11 and coacts with a pump rod 37 which moves in a pump housing 38. The latter is threaded into the pump block 12 so that both the pump housing and the pump rod can be easily replaced.
  • the piston 36 is returned to the position shown in the drawing by structure including a spring 39 and a washer 40 against which the spring bears.
  • the pump rod 37 has an end head 41 which is loosely connected to the piston 36 and bears against its inner side.
  • the lower part of the cylinder 11 is in communication with the atmosphere through an opening 42.
  • the upper portion of the cylinder space is in communication with the upper part of the bore 13 through a conduit 43.
  • the valve body 14 has moved downward from the position shown in the drawing, the cylinder space also will be in communication with the atmosphere through a cavity 44 in the motor block 10, the space and the channel 21. In such lower position of the valve body 14, the passageway 34 at the same time will be closed.
  • the upper ends of the conduit 43 and the bore 13 are closed by a cover 45 which can be made of a suitable plastic material.
  • the pump block 12 is provided with valve structure 46 of the same construction as the valve structure 28 shown in the drawing and described above.
  • the valve structure 46 is associated with a check valve which includes a ball 47, a spring 48 and a seat 49.
  • the block 12 is also provided with a second check valve which includes a ball 50, a spring 51 and a seat 52.
  • the latter is formed in a plug 53 having a passageway 54 in communication with a passageway 55 formed in the block 12.
  • the block 12, in addition, is formed with passageways 56 and 57 and a connection 58. When the passageways 55 and 56 are connected to a source of supply of liquid, such as a body of oil, for example, such liquid can be discharged under pressure from the connection 58.
  • the apparatus described above operates in the following manner.
  • a source of supply of compressed air is connected to the inlet 26 and the operating'knob 29 is held in its in or operative position
  • compressed air will flow through the passageway 34 into the cylinder space and impart downward movement to the piston 36.
  • the piston has moved to its lowermost position, communication is established between the cylinder space and the bore 13 and compressed air will flow through the duct 43 and act on the valve body 14. Since the diameter of the seal 18 is greater than the diameter of the slide 15, downward movement will be imparted to the valve body. When this occurs the passageway 34 will be closed and compressed air no longer will flow to the cylinder 11. Immediately after or at the same time that the passageway 34 is closed, the slide 15 will open the connection between the cavity 44 and the space 20.
  • the washer 40 coacts with the pump rod 37 in such manner that the latter will follow the up and down movements of the piston 36.
  • the washer 40 coacts with the pump rod 37 in such manner that the latter will follow the up and down movements of the piston 36.
  • a compressed-air motor comprising a cylinder having a space and a block serving as a head therefor
  • a piston for said cylinder which is movable forward and backward in the space
  • valve means comprising a valve body movable in said bore between first and second positions
  • structure including passageways only in said block for supplying compressed air from a source of supply to the piston of said motor in the firstposition of said valve body and for establishing communication between the cylinder space and atmosphere in the second position of said valve body,
  • said structure being so constructed and arranged that compressed air is supplied to said piston when it is in one position in the cylinder space and said valve body is in its first position and such supply of compressed air to said piston through said passageways ceases when said valve body is in it second position,
  • valve body responsive to compressed air supplied to said motor when said body is in its first position, being movable therefrom to its second position, and i g. said valve body comprising a rod having an intermediate portion and a first end portion removed from said piston and a second end portion nearer to said piston than said first end portion, said first end portion including resilient means in sealing engagement with said bore and said second end portion being solid and in sliding engagement with at least a part of said bore and said intermediate portion having a smaller cross-sectional area than that part of said bore with which it coextends.
  • passageways include at least one cavity in said block at a region thereof nearest to said piston, and said one cavity forming at least a part of said passageway which establishes communication between the cylinder space and the atmosphere and includes that part of said bore coextensive with the intermediate portion of said valve body when it is in its second position.
  • the second end portion of said valve body includes a conical-shaped end section and a thrust head which is fixed to and carried by said end section and faces said piston, said conical-shaped end section functioning to guide compressed air supplied to said motor through at least one passageway in said block in the first position of said valve body.
  • said resilient means includes a conical-shaped collar in sealing engagement with said bore and an integrally formed hollow bushin fixed to the first end portion of said rod.
  • said resilient means includes a conical-shaped collar in sealing engagement with said bore and an integrally formed hollow bushin fixed to the first end portion of said rod.
  • the first end portion of said rod is formed with ridges at its periphery which are axially spaced from one another, and said hollow bushing of said resilient means being anchored on said rod between said axially spaced ridges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US00124188A 1970-03-13 1971-03-15 Compressed-air pump Expired - Lifetime US3726185A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE333770 1970-03-13

Publications (1)

Publication Number Publication Date
US3726185A true US3726185A (en) 1973-04-10

Family

ID=20261896

Family Applications (1)

Application Number Title Priority Date Filing Date
US00124188A Expired - Lifetime US3726185A (en) 1970-03-13 1971-03-15 Compressed-air pump

Country Status (5)

Country Link
US (1) US3726185A (es)
DE (1) DE2111645A1 (es)
FR (1) FR2084584A5 (es)
GB (1) GB1288180A (es)
NL (1) NL7103260A (es)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042311A (en) * 1975-03-08 1977-08-16 Aioi Seiki Kabushiki Kaisha Pump fluid motor carrying spool valve for distributor valve actuation
US4166410A (en) * 1977-09-26 1979-09-04 Edward Bleiweiss Pneumatic motor
US5309713A (en) * 1992-05-06 1994-05-10 Vassallo Franklin A Compressed gas engine and method of operating same
US5341723A (en) * 1993-04-20 1994-08-30 Michael Hung Reciprocating pneumatic motor for hydraulics
US20030228227A1 (en) * 2002-06-06 2003-12-11 Jerry Jacobsen Pumping system, a replacement kit for the pumping system, and a method for maintaining the pumping system
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
EP2273114A1 (en) * 2009-07-06 2011-01-12 Graco Minnesota Inc. Reciprocating pump with electronically monitored air valve and piston
US20110197750A1 (en) * 2010-02-12 2011-08-18 Wen-Feng Wang Pneumatic Control Device for Supplying Hydraulic Fluid

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE395850B (sv) * 1975-04-24 1977-08-29 Atlas Copco Ab Smorjanordning for borrigg
US4621496A (en) * 1984-04-19 1986-11-11 Teledyne Industries, Inc. Actuator control system
CN102587007B (zh) * 2012-02-22 2013-09-18 江苏理工学院 保压增压器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277636A (en) * 1926-09-16 1928-03-29 Alfred Eickhoff Improvements in valve devices especially for compressed air engines
DE605270C (de) * 1932-02-25 1934-11-07 Eickhoff Geb Pressluftgegenzylinder fuer Schuettelrutschen
US2670719A (en) * 1950-10-02 1954-03-02 Cities Service Res & Dev Co Lubricant pumping device
US3079900A (en) * 1961-06-26 1963-03-05 Applied Power Ind Inc Fluid motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB277636A (en) * 1926-09-16 1928-03-29 Alfred Eickhoff Improvements in valve devices especially for compressed air engines
DE605270C (de) * 1932-02-25 1934-11-07 Eickhoff Geb Pressluftgegenzylinder fuer Schuettelrutschen
US2670719A (en) * 1950-10-02 1954-03-02 Cities Service Res & Dev Co Lubricant pumping device
US3079900A (en) * 1961-06-26 1963-03-05 Applied Power Ind Inc Fluid motor

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042311A (en) * 1975-03-08 1977-08-16 Aioi Seiki Kabushiki Kaisha Pump fluid motor carrying spool valve for distributor valve actuation
US4166410A (en) * 1977-09-26 1979-09-04 Edward Bleiweiss Pneumatic motor
US5309713A (en) * 1992-05-06 1994-05-10 Vassallo Franklin A Compressed gas engine and method of operating same
US5341723A (en) * 1993-04-20 1994-08-30 Michael Hung Reciprocating pneumatic motor for hydraulics
US7284961B2 (en) 2002-06-06 2007-10-23 Bs&B Safety Systems, Ltd. Pumping system, replacement kit including piston and/or cylinder, and method for pumping system maintenance
US20030228227A1 (en) * 2002-06-06 2003-12-11 Jerry Jacobsen Pumping system, a replacement kit for the pumping system, and a method for maintaining the pumping system
WO2003104652A1 (en) * 2002-06-06 2003-12-18 Bs & B Safety Systems Limited A pumping system with replaceable piston-cylinder unit
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
US9677549B2 (en) 2005-07-28 2017-06-13 Graco Minnesota Inc. Reciprocating pump with electronically monitored air valve and piston
US9677550B2 (en) 2005-07-28 2017-06-13 Graco Minnesota Inc. Reciprocating pump with electronically monitored air valve and piston
EP2273114A1 (en) * 2009-07-06 2011-01-12 Graco Minnesota Inc. Reciprocating pump with electronically monitored air valve and piston
US20110197750A1 (en) * 2010-02-12 2011-08-18 Wen-Feng Wang Pneumatic Control Device for Supplying Hydraulic Fluid
US8262371B2 (en) * 2010-02-12 2012-09-11 Wen-Feng Wang Pneumatic control device for supplying hydraulic fluid

Also Published As

Publication number Publication date
NL7103260A (es) 1971-09-15
FR2084584A5 (es) 1971-12-17
GB1288180A (es) 1972-09-06
DE2111645A1 (de) 1971-09-23

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