EP0282478A1 - Machine a deplacement de fluide - Google Patents

Machine a deplacement de fluide

Info

Publication number
EP0282478A1
EP0282478A1 EP19860905751 EP86905751A EP0282478A1 EP 0282478 A1 EP0282478 A1 EP 0282478A1 EP 19860905751 EP19860905751 EP 19860905751 EP 86905751 A EP86905751 A EP 86905751A EP 0282478 A1 EP0282478 A1 EP 0282478A1
Authority
EP
European Patent Office
Prior art keywords
pressure
cylinder
seals
piston
fluid
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.)
Withdrawn
Application number
EP19860905751
Other languages
German (de)
English (en)
Inventor
Anton Sorensen
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.)
WESTERGAARD KNUD ERIK
Original Assignee
WESTERGAARD KNUD ERIK
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 WESTERGAARD KNUD ERIK filed Critical WESTERGAARD KNUD ERIK
Publication of EP0282478A1 publication Critical patent/EP0282478A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate

Definitions

  • a fluid-displacement machine A fluid-displacement machine.
  • the pressure in the interconnected intermediate sealing spaces of all cylinders is kept at a value close to the supply pressure, i.e. comparatively low, so that a further reduction of the risk of leakage through the low-pressure seal is obtained.
  • the exemplary embodiment of a piston-and-cyllnder machine shown in the Figure constitutes a three-cylinder pump with cylinders 1, 2 and 3 with cooperating plunger pistons 4, 5 and 6 respectively.
  • the cylinders 1, 2 and 3 are shown as constituting parts of a pump body (not shown), that may be common to the three cylinders 1, 2 and 3, the working chambers 7, 8 and 9 of which constitute cylindrical bores in the pump body.
  • the pistons 4, 5 and 6 in the three cylinders 1, 2 and 3, angularly spaced by 120°, are driven in a reciprocatory motion by a common eccentric cam 10 carried on or integral with a drive shaft 11 adapted to be driven by a suitable motor (not shown).
  • inlet and outlet valves connected to or placed in inlet ducts 12, 13 and 14 and outlet ducts 15, 16 and 17 communicating with each working chamber 7, 8 and 9 respectively, as well as return springs adapted to keep the pistons 4, 5 and 6 in contact with the rotating eccentric cam 10.
  • return springs adapted to keep the pistons 4, 5 and 6 in contact with the rotating eccentric cam 10.
  • the invention is not limited to pumps of the known "star configuration" shown, as it may be applied with the same effect to pumps and other piston machines, such as hydraulic motors, of various configurations, such as having a number of axially parallel cylinders, the pistons of which are reciprocated by a common so-called swash plate or the like.
  • Each of the cylinders 1, 2 and 3 comprises two sealing rings, viz. a primary sealing ring 18, 19 and 20 respectively and a secondary sealing ring 21, 22 and 23 respectively.
  • the primary sealing rings 18, 19 and 20 provide seals between each cylinder's working chamber 7, 8 and 9 respectively and an intermediate sealing chamber 24, 25 and 26 respectively, while the secondary sealing rings 21, 22 and 23 provide seals between the intermediate sealing chambers 24, 25 and 26 respectively of each cylinder 1, 2 and 3.
  • the pressure difference across each primary sealing ring may be defined as the primary leakage pressure, and that across the secondary sealing rings as the secondary leakage pressure.
  • the primary leakage pressure is the difference between the pressure in the working chamber and the pressure in the intermediate sealing chamber
  • the secondary leakage pressure is the. difference between the pressure in the intermediate sealing chamber and the external space.
  • each working chamber 7, 8 or 9 will vary cyclically depending on the direction of movement and the position of the piston, so that during a filling stroke, with the piston moving away from the end of the cylinder containing the inlet and outlet ducts, the pressure will be approximately the same as (or a little lower than) the supply pressure, whereas during a de- very stroke with the piston moving towards said end of the cylinder, the pressure will be approximately the same as (or a little higher than) the delivery or output' pressure.
  • the secondary leakage pressure across the secondary sealing rings 21, 22 and 23 will generally be roughly equal to the difference between the supply pressure and the pressure in the external spaces 27, 28 and 29. If the latter are in open communication with the atmosphere, the secondary leakage pressure is roughly equal to the supply pressure, which is usually fairly low and hence causes a minimum of leakage flow.
  • the external space may, however, be connected (in a manner not shown) to the supply side of the pump, in which case the secondary leakage pressure will be practically zero.
  • the secondary sealing rings 21, 22 and 23 will normally - as shown - be of the two- -way type, i.e. sealing against pressure differences in both directions, so as to prevent both the loss of liquid to the surroundings and the ingress of contaminating matter in the system comprising the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Dans une machine à déplacement de fluide du type à piston/cylindre et comprenant deux joints d'étanchéité (18, 21; 19, 22; 20, 23) pour chaque piston (4; 5; 6), les espaces intermédiaires (24; 25; 26) entre les joints d'étanchéité sont reliés entre eux par un conduit (30). Cet agencement permet de réduire la pression provoquée par les fuites provenant de la partie à haute pression de tous les espaces intermédiaires. Dans un mode de réalisation préféré, les joints d'étanchéité à haute pression (18; 19; 20) sont de type unidirectionnel, ce qui permet un écoulement relativement libre en direction de la chambre de travail (7; 8; 9) du cylindre concerné. Grâce à cet agencement, la pression dans les espaces intermédiaires est maintenue au niveau ou proche du niveau de la pression d'alimentation, ce qui empêche toute fuite importante en aval des joints d'étanchéité à basse pression (21; 22; 23), et en même temps permet au fluide s'étant dispersé en aval du joint d'étanchéité à haute pression dans l'un des cylindres d'être réintroduit dans le système en aval du joint d'étanchéité unidirectionnel à haute pression d'au moins un autre cylindre, ce dernier se trouvant dans la phase d'aspiration ou de remplissage de son cycle de fonctionnement.
EP19860905751 1986-09-10 1986-09-10 Machine a deplacement de fluide Withdrawn EP0282478A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK1986/000103 WO1988002070A1 (fr) 1986-09-10 1986-09-10 Machine a deplacement de fluide

Publications (1)

Publication Number Publication Date
EP0282478A1 true EP0282478A1 (fr) 1988-09-21

Family

ID=8153352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860905751 Withdrawn EP0282478A1 (fr) 1986-09-10 1986-09-10 Machine a deplacement de fluide

Country Status (2)

Country Link
EP (1) EP0282478A1 (fr)
WO (1) WO1988002070A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19522306B4 (de) * 1994-06-24 2004-08-26 Denso Corp., Kariya Hochdruck-Kraftstoffzuführungspumpe
DE19904926A1 (de) * 1999-02-06 2000-08-10 Bosch Gmbh Robert Pumpenaggregat für eine schlupfgeregelte, hydraulische Fahrzeugbremsanlage
GB2404954A (en) * 2003-08-13 2005-02-16 Boc Group Plc Piston pump with leak prevention means for a fuel cell system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898867A (en) * 1954-11-29 1959-08-11 Milton Roy Co Pump with sealing arrangement
GB1085511A (en) * 1964-07-09 1967-10-04 Lucas Industries Ltd Hydraulic reciprocating pumps
JPS53139204A (en) * 1977-05-12 1978-12-05 Shikutani Kk Horizontal type plunger pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8802070A1 *

Also Published As

Publication number Publication date
WO1988002070A1 (fr) 1988-03-24

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Legal Events

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