EP0773346A1 - Moteur a gaz comprimé - Google Patents

Moteur a gaz comprimé Download PDF

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Publication number
EP0773346A1
EP0773346A1 EP96308004A EP96308004A EP0773346A1 EP 0773346 A1 EP0773346 A1 EP 0773346A1 EP 96308004 A EP96308004 A EP 96308004A EP 96308004 A EP96308004 A EP 96308004A EP 0773346 A1 EP0773346 A1 EP 0773346A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
control
gas
piston
motor
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.)
Ceased
Application number
EP96308004A
Other languages
German (de)
English (en)
Inventor
Deborah Ann Wrigley
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.)
Robert Cort Ltd
Original Assignee
Robert Cort Ltd
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 Robert Cort Ltd filed Critical Robert Cort Ltd
Publication of EP0773346A1 publication Critical patent/EP0773346A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
    • F01B11/001—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type in which the movement in the two directions is obtained by one double acting piston motor

Definitions

  • the present invention relates to a motor which is powered by compressed gas (typically air), and to a fluid pump which uses such a gas motor to effect pumping.
  • compressed gas typically air
  • Known reciprocating gas pumps all use valves for directing compressed gas alternately to one side and the other side of a piston in a cylinder, for causing the piston to reciprocate.
  • Various mechanisms are used for triggering the switching of the valve. These include designs involving push-rods, pneumatic timing ports, magnetic pilot valves, and special seals. In all cases, whatever the nature of the triggering event, the movement of the main valve is actually caused by allowing some of the compressed gas supply to act upon the end of the valve. This makes it very difficult to achieve a rapid and accurate response. Consequently known gas motors tend to be inefficient, with the pistons not reliably travelling for the full intended stroke. There are particular problems if the motors are intended to operate over a range of speeds, and particularly at high speed.
  • the present invention concerns a gas motor having a main (gas-driven) piston/cylinder arrangement, and also at least one secondary piston/cylinder arrangement which effects compression of a secondary gas supply when the main piston is nearing the end of an intended stroke.
  • the compressed secondary gas supply is used to move the main switching valve.
  • the secondary gas may be atmospheric air.
  • the secondary piston/cylinder arrangement may employ a secondary piston which is linked with the main piston so that it reciprocates synchronously, in its own cylinder.
  • This secondary piston/cylinder may serve as a fluid pump, as well as having a switching function.
  • the second cylinder may have a port communicating with atmospheric air, which port is arranged to be closed as the secondary piston moves towards one end of its stroke.
  • This compressed air then serves for moving the main switching valve.
  • the main piston and cylinder are coaxial with a pair of smaller secondary piston/cylinder assemblies. All three pistons are connected so as to reciprocate together.
  • One end region of each secondary cylinder may serve as a fluid pump/ there being check valves so that, in a generally conventional way, fluid is sucked in and pushed out as the secondary pistons reciprocate.
  • On the other sides of the secondary pumps there are air spaces in the secondary cylinders, each having a port communicating with the atmosphere.
  • the main piston approaches the end of its intended stroke, one of the secondary pistons moves to obstruct its port. Continuing movement therefore compresses the atmospheric air in the associated air space.
  • the air spaces are communicated with the main valve controlling the gas supply to the main cylinder, so that this is switched.
  • the task of moving the switching valve is removed from the main gas (usually air) supply, and devolved to a secondary fluid system, usually using atmospheric air.
  • a secondary fluid system usually using atmospheric air.
  • the pressure required to switch the valve can accumulate over a relatively long period, during which the powering of the main piston is not affected.
  • the main piston will carry out full strokes.
  • the main piston can operate at quite low pressure particularly if (as would normally be the case) the secondary cylinders are of much smaller area, giving high compression.
  • the illustrated pump has a casing 10 defining a large primary cylinder 12 and two small coaxial cylinders 14, 16, one on each side.
  • the main cylinder contains a main piston 18, and the smaller cylinders contain smaller pistons 20,22. They are linked by a coaxial rod 24. Between the main cylinder 12 and each small cylinder 14,16, the rod passes through a sliding seal 26.
  • the main cylinder there are two ports 28,30, disposed so that they are generally on different axial sides of the piston 18.
  • the ports are coupled to a main valve 32 which, at any given time, links one of the ports to a compressed air supply, while connecting the other port to exhaust.
  • the two lesser piston/cylinder arrangements are identical to each other.
  • a pair of ports 34 containing oppositely-oriented check valves. They will generally be connected to a hydraulic fluid system so that, as the piston (e.g 20) reciprocates, it pumps hydraulic fluid.
  • Fig. 1 shows the valve 32 in the configuration for leftward movement.
  • a high-pressure air signal to be sent through the right-hand pilot line 40, causing the valve 32 to switch to the configuration shown in Fig. 2.
  • the main compressed air supply then passes into the left-hand end of the main air cylinder 12, causing the pistons to be driven to the right.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP96308004A 1995-11-07 1996-11-05 Moteur a gaz comprimé Ceased EP0773346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9522793 1995-11-07
GBGB9522793.0A GB9522793D0 (en) 1995-11-07 1995-11-07 Compressed gas motor

Publications (1)

Publication Number Publication Date
EP0773346A1 true EP0773346A1 (fr) 1997-05-14

Family

ID=10783522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96308004A Ceased EP0773346A1 (fr) 1995-11-07 1996-11-05 Moteur a gaz comprimé

Country Status (2)

Country Link
EP (1) EP0773346A1 (fr)
GB (2) GB9522793D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2355769A (en) * 1999-10-14 2001-05-02 Potential Makes Works Ltd Method and apparatus for generating motive power
WO2010094118A1 (fr) * 2009-02-23 2010-08-26 Novopower Ltd. Compresseur alimenté par un gaz sous pression et système comprenant ledit compresseur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2491298C (fr) * 2004-12-30 2009-07-07 Envirodrive Systems Inc. Moteur alternatif pneumatique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286929A (en) * 1977-03-23 1981-09-01 Rodney T. Heath Dual pressure gas motor, and method of operation
FR2591659A1 (fr) * 1985-12-18 1987-06-19 Fogautolube Sa Systeme de distribution pour moteur pneumatique alternatif
WO1990012197A1 (fr) * 1989-04-06 1990-10-18 Speeder A.S. Procede et agencement de commande d'un moteur lineaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB784684A (en) * 1954-08-31 1957-10-16 George Stephen Kammer Improvements in reciprocating motors for actuation by a fluid supplied at substantially constant pressure
US2970579A (en) * 1959-11-23 1961-02-07 Tomlon Corp Hydraulic reversing control
ZA756923B (en) * 1974-12-18 1977-04-27 Ingersoll Rand Co Hydraulic actuator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286929A (en) * 1977-03-23 1981-09-01 Rodney T. Heath Dual pressure gas motor, and method of operation
FR2591659A1 (fr) * 1985-12-18 1987-06-19 Fogautolube Sa Systeme de distribution pour moteur pneumatique alternatif
WO1990012197A1 (fr) * 1989-04-06 1990-10-18 Speeder A.S. Procede et agencement de commande d'un moteur lineaire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2355769A (en) * 1999-10-14 2001-05-02 Potential Makes Works Ltd Method and apparatus for generating motive power
WO2010094118A1 (fr) * 2009-02-23 2010-08-26 Novopower Ltd. Compresseur alimenté par un gaz sous pression et système comprenant ledit compresseur
CN102449303A (zh) * 2009-02-23 2012-05-09 新动力有限公司 加压气体动力压缩机和包括该加压气体动力压缩机的系统
JP2012518733A (ja) * 2009-02-23 2012-08-16 ノボパワー リミテッド 加圧ガス駆動コンプレッサおよび当該コンプレッサを備えるシステム
CN104481830A (zh) * 2009-02-23 2015-04-01 新动力有限公司 加压气体动力压缩机和包括该加压气体动力压缩机的系统
CN102449303B (zh) * 2009-02-23 2015-05-13 新动力有限公司 加压气体动力压缩机和包括该加压气体动力压缩机的系统
US9470110B2 (en) 2009-02-23 2016-10-18 Novopower Ltd. Pressurized-gas powered compressor and system comprising same

Also Published As

Publication number Publication date
GB2307013B (en) 1999-09-29
GB2307013A (en) 1997-05-14
GB9622999D0 (en) 1997-01-08
GB9522793D0 (en) 1996-01-10

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