CH257522A - Hydraulic pump. - Google Patents

Hydraulic pump.

Info

Publication number
CH257522A
CH257522A CH257522DA CH257522A CH 257522 A CH257522 A CH 257522A CH 257522D A CH257522D A CH 257522DA CH 257522 A CH257522 A CH 257522A
Authority
CH
Switzerland
Prior art keywords
barrel
chamber
hydraulic pump
cylinders
liquid
Prior art date
Application number
Other languages
French (fr)
Inventor
Anonyme Messier Societe
Original Assignee
Anonyme Messier Societe
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 Anonyme Messier Societe filed Critical Anonyme Messier Societe
Publication of CH257522A publication Critical patent/CH257522A/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141Details or component parts
    • F04B1/145Housings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141Details or component parts
    • F04B1/143Cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10Valves; Arrangement of valves
    • F04B53/12Valves; Arrangement of valves arranged in or on pistons
    • F04B53/125Reciprocating valves
    • F04B53/127Disc valves

Landscapes

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

Description

  

  Pompe hydraulique.    La     présente    invention a pour objet.     un      pompe     hydraulique    à barillet dans laquelle  le liquide, admis d'un côté du     barillet,    dans  une chambre d'aspiration, passe à travers des       liiston#,    se déplaçant dans des cylindres     mon-          Ii'        -#    barillet et est refoulé de l'autre  côté du barillet.  



  Cette pompe est     caractérisée    en ce que       @lcë        clapets        plats    r. fonctionnement automa  tique sont prévus dans lesdits pistons et sont       commandés    par dépression.  



  Le dessin     représente    schématiquement, à  titre     d'exemple,    une forme d'exécution de la  pompe faisant l'objet de la présente inven  tion.  



  La     fig.    1 est une coupe axiale.       L < t    fi<I>n</I>  ,,,.     2?    en est une coupe transversale       simplifiée    et à plus petite     échelle.     



  La, pompe comporte un carter 1,     dc.    forme       générale    cylindrique dont un des fonds  '       présente    un palier 3 pour un arbre moteur  1.<B>Cr-</B> dernier     est    également supporté, en son       extrémité    5, dans un palier 6 formé à     l'extré-          iriité    d'un tirant 7 traversant l'autre fond 8       (lu    carter. L'extrémité 9 du tirant 7 faisant       #4aillic    par rapport au fond 8 est filetée et  coopère avec un écrou<B>10</B> s'appuyant sur le  fond 8.

   A son autre extrémité, le tirant 7  forme le rebord 11 contre lequel prend appui       tin    barillet 1.2 percé d'un certain nombre     d'alé-          sages.        Dans    chacun de ces     alésages    est placé       un    cylindre 13 dont l'axe est parallèle à celui       dus    paliers 3 et 5. Ce cylindre présente     une       portée conique 14 qui, en coopération avec  l'arête vive du bord de l'alésage, assure l'étan  chéité entre le cylindre et le     barillet    à l'égard  du liquide se trouvant dans la. chambre adja  cente 1.6.

   Les cylindres 13 prennent appui sur  le fond 8, non pas directement, mais par l'in  termédiaire d'un élément élastique 17. La  partie élargie 18 du     cylindre    1.3 limite une  chambre 19 communiquant par des lumières       \?()    avec la chambre de refoulement 16 de la  pompe. Un clapet plat     ?1,    soumis à l'action  d'un ressort ??,     est        interposé    entre la chambre  19 et la chambre 23 limitée par la. chemise 24  du cylindre. Dans celui-ci peut se déplacer,  d'une manière étanche, un piston tubulaire     ?5     présentant un canal longitudinal 26.

   Celui-ci  débouche dans une chambre 27 et la commu  nication entre le canal 26 et la chambre 27 est  contrôlée par un clapet plat 28, libre ou sou  mis à l'action d'un très léger ressort (non re  présenté). La. chambre 2 7 communique avec la  chambre     ?3    par une ouverture 29 pratiquée  sur le fond du     piston.    Le canal 26 débouche  dans la chambre d'aspiration 3C> par une lu  mière 31. Le piston     25    présente une tête 32  dans laquelle est pratiquée une cavité sphéri  que<B>'03</B> servant au logement d'une bille tron  quée 34. Un ressort 35 est interposé entre,  d'une part, le barillet 1? et, d'autre part, la  tête 32. Les billes 34 prennent appui, par leur  face plane 36, sur une butée à billes 37 dont.

    l'axe forme un certain angle avec celui des  paliers 3 et 6, un plateau 38 étant formé ,sur      l'arbre 4 pour recevoir cette butée. Une tubu  lure d'aspiration<B>39</B> débouche     tangentiellement     dans la chambre 30.  



  Le     fonctionnement    de cette pompe est le  suivant: La rotation -des organes     enfermés     dans la     chambre    30 met le liquide     contenu     dans cette chambre en rotation suivant le sens  montré par la flèche f sur la     fig.    2. Le liquide  contenu dans la canalisation 39, dirigée tan  gentiellement à la trajectoire des filets  liquides dans la chambre 30, est donc entraîné,  ce qui correspond à la     création    d'une certaine  dépression dans la     canalisation    39.

   La rota  tion du plateau 38 et de la butée 37 imprime  un mouvement de va-et-vient aux pistons 25:  renfoncement des pistons 25 est provoqué di  rectement par     l'action    de la butée 3 7 s'exer  çant par l'intermédiaire -des billes 34; le re  tour des pistons     s'effectue        sous        l'action    des  ressorts 35. Pendant l'enfoncement des pis  tons 25, le liquide contenu dans la chambre  23 ne peut s'échapper par le canal 26, en rai  son de la fermeture du clapet d'aspiration 28.

    Le liquide contenu dans la chambre 23 est       clone    mis sous     pression    jusqu'à ce que celle-ci  soit suffisante pour vaincre l'action du ressort  22 et le liquide est alors refoulé, sous pression,,       dans    l'a chambre de refoulement 16 et, de là,  par les lumières 40 et le canal 41     pratiqués     dans le tirant 7, vers la     canalisation    de re  foulement. Pendant la course de retour du  piston 25, le liquide contenu dans la chambre  19 et la chambre ,de refoulement 16 ne peut  rétrograder, en     raison    de la fermeture     -du    cla  pet de refoulement 21.

   La dépression créée  dans la chambre 23 soulève le clapet 28 et le  liquide contenu dans la chambre d'admission  30 a accès dans la chambre 23 par la lumière  31 et le canal 26. Lorsque le piston 25 s'en  fonce à nouveau, le clapet 28 est appliqué sur  -son siège, le liquide contenu dans la chambre  23 est     comprimé    et le cycle recommence. On  remarquera que le liquide ne subit pas d'in  version dans le sens de son mouvement.    La     section    de passage du liquide dans le       piston    25 est considérable, puisque le canal 26  peut avoir un diamètre voisin de celui du pis-    ton.

   L'application de clapets plats tels que le  clapet 28 permet le contrôle de la communica  tion entre le côté admission et le côté refoule  ment ,de la pompe sans que la section du pas  sage du liquide en soit diminuée.  



  Le     matelas    élastique 17 assure la. portée  simultanée des joints entre le barillet et les  cylindres lorsque leur nombre est supérieur à  trois, et cela sans sujétion onéreuse de fabri  cation. L'appui d'une partie conique des cylin  dres 13 contre une     arêté    vive du barillet 1 2  constitue une solution simple de l'étanchéité  du montage de ces organes. La dépression  créée dans la     tubulure    d'aspiration 39 par le  mouvement -du liquide dans la chambre 30  permet d'étendre le domaine d'application de  la pompe en rendant possible l'existence d'une       dénivellation    importante entre celle-ci et sa  bâche     d'alimentation,    sans introduire de ris  ques de désamorçage.  



  La pompe décrite a l'avantage d'être de  construction simple, de bon rendement et  d'avoir un fonctionnement     particulièrement     doux, sujet qu'à de faibles vibrations.



  Hydraulic pump. The object of the present invention is. a hydraulic barrel pump in which the liquid, admitted from one side of the barrel, into a suction chamber, passes through liiston #, moving in cylinders my- Ii '- # barrel and is discharged from the other side of the barrel.



  This pump is characterized in that @ lcë flat valves r. automatic operation are provided in said pistons and are controlled by vacuum.



  The drawing shows schematically, by way of example, an embodiment of the pump forming the subject of the present invention.



  Fig. 1 is an axial section. L <t fi <I> n </I> ,,,. 2? is a simplified cross section on a smaller scale.



  The pump has a housing 1, dc. generally cylindrical shape, one of the ends of which has a bearing 3 for a motor shaft 1. The latter is also supported, at its end 5, in a bearing 6 formed at the end of a tie rod 7 passing through the other base 8 (see casing. The end 9 of the tie rod 7 making # 4aillic relative to the base 8 is threaded and cooperates with a nut <B> 10 </B> resting on the base 8 .

   At its other end, the tie rod 7 forms the flange 11 against which bears a barrel 1.2 pierced with a number of bore holes. In each of these bores is placed a cylinder 13 whose axis is parallel to that of the bearings 3 and 5. This cylinder has a conical bearing 14 which, in cooperation with the sharp edge of the edge of the bore, ensures the sealing between the cylinder and the barrel with respect to the liquid in the. room adja cente 1.6.

   The cylinders 13 are supported on the bottom 8, not directly, but via an elastic element 17. The widened part 18 of the cylinder 1.3 limits a chamber 19 communicating by openings \? () With the chamber of discharge 16 of the pump. A flat valve? 1, subjected to the action of a spring ??, is interposed between the chamber 19 and the chamber 23 limited by the. cylinder liner 24. Therein can move in a sealed manner a tubular piston 5 having a longitudinal channel 26.

   This opens into a chamber 27 and the communication between the channel 26 and the chamber 27 is controlled by a flat valve 28, free or subjected to the action of a very light spring (not shown). Chamber 27 communicates with chamber 3 through an opening 29 in the bottom of the piston. The channel 26 opens into the suction chamber 3C> through a light 31. The piston 25 has a head 32 in which is formed a spherical cavity <B> '03 </B> serving to accommodate a trunn ball. quée 34. A spring 35 is interposed between, on the one hand, the barrel 1? and, on the other hand, the head 32. The balls 34 bear, by their flat face 36, on a ball stop 37 of which.

    the axis forms a certain angle with that of the bearings 3 and 6, a plate 38 being formed, on the shaft 4 to receive this stop. A <B> 39 </B> suction pipe opens tangentially into chamber 30.



  The operation of this pump is as follows: The rotation of the members enclosed in the chamber 30 causes the liquid contained in this chamber to rotate in the direction shown by the arrow f in FIG. 2. The liquid contained in the pipe 39, directed tangentially to the path of the liquid streams in the chamber 30, is therefore entrained, which corresponds to the creation of a certain depression in the pipe 39.

   The rotation of the plate 38 and of the stop 37 induces a reciprocating movement on the pistons 25: recess of the pistons 25 is caused directly by the action of the stop 3 7 exerted by the intermediary - balls 34; the return of the pistons is effected by the action of the springs 35. While driving in the pis tons 25, the liquid contained in the chamber 23 cannot escape through the channel 26, due to the closing of the valve. suction 28.

    The liquid contained in the chamber 23 is cloned pressurized until the latter is sufficient to overcome the action of the spring 22 and the liquid is then discharged, under pressure, into the delivery chamber 16 and , from there, through the slots 40 and the channel 41 made in the tie rod 7, to the return pipe. During the return stroke of the piston 25, the liquid contained in the chamber 19 and the discharge chamber 16 cannot downshift, due to the closing of the discharge valve 21.

   The vacuum created in the chamber 23 lifts the valve 28 and the liquid contained in the intake chamber 30 has access to the chamber 23 through the opening 31 and the channel 26. When the piston 25 sinks again, the valve 28 is applied to its seat, the liquid contained in the chamber 23 is compressed and the cycle begins again. It will be noted that the liquid does not undergo inversion in the direction of its movement. The section of passage of the liquid in the piston 25 is considerable, since the channel 26 may have a diameter close to that of the piston.

   The application of flat valves such as the valve 28 allows the control of the communication between the inlet side and the discharge side, of the pump without the section of the passage wise of the liquid being reduced.



  The elastic mattress 17 ensures the. simultaneous bearing of the seals between the barrel and the cylinders when their number is greater than three, and this without costly manufacturing constraints. The support of a conical part of the cylinders dres 13 against a sharp edge of the barrel 1 2 constitutes a simple solution of the sealing of the assembly of these members. The depression created in the suction pipe 39 by the movement of the liquid in the chamber 30 makes it possible to extend the field of application of the pump by making possible the existence of a significant difference in level between the latter and its tank. power supply, without introducing any risk of defusing.



  The pump described has the advantage of being of simple construction, of good efficiency and of having a particularly smooth operation, subject only to low vibrations.

 

Claims (1)

REVENDICATION Pompe hydraulique à barillet dans la quelle le liquide, admis d'un côté du barillet, dans une chambre d'aspiration, passe à tra vers des pistons se déplaçant dans des cylin dres montés dans le barillet et est refoulé -de l'autre côté du barillet, caractérisée en ce que des clapets plats à fonctionnement automa tique sont prévus dans lesdits pistons et sont commandés par dépression. SOUS-REVENDICATIONS 1. Pompe hydraulique selon la revendica tion, caractérisée en ce que le barillet est retenu dans le carter - par un tirant qui prend appui sur le fond dé celui-ci. 2. CLAIM Hydraulic barrel pump in which the liquid, admitted on one side of the barrel, into a suction chamber, passes through pistons moving in cylinders mounted in the barrel and is discharged from the other side of the barrel, characterized in that flat valves with automatic operation are provided in said pistons and are controlled by vacuum. SUB-CLAIMS 1. Hydraulic pump according to claim, characterized in that the barrel is retained in the casing - by a tie rod which bears on the bottom thereof. 2. Pompe hydraulique selon la. revendica tion, caractérisée en ce que les cylindres dans le barillet prennent appui sur le fond du car ter par l'intermédiaire d'un élément élastique. 3. Pompe hydraulique selon la revendica- tïon, caractérisée en ce que l'étanchéité entre les cylindres et le barillet est procurée par l'appui des cylindres contre une arête vive dudit barillet. 4. Hydraulic pump according to. claim, characterized in that the cylinders in the barrel bear against the bottom of the housing by means of an elastic element. 3. Hydraulic pump according to claim, characterized in that the seal between the cylinders and the barrel is provided by the support of the cylinders against a sharp edge of said barrel. 4. Pompe hydraulique selon la revendica- lion, caractérisée en ce que le liquide arrive tanbentiellement dans la chambre .d'aspiration de la pompe, dans laquelle il est mis en rota tion par un plateau incliné sur son axe de rotation et actionnant les pistons. Hydraulic pump according to claim, characterized in that the liquid arrives tanbentially in the suction chamber of the pump, in which it is rotated by a plate inclined on its axis of rotation and actuating the pistons.
CH257522D 1943-12-27 1945-11-03 Hydraulic pump. CH257522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR257522X 1943-12-27

Publications (1)

Publication Number Publication Date
CH257522A true CH257522A (en) 1948-10-15

Family

ID=8884715

Family Applications (1)

Application Number Title Priority Date Filing Date
CH257522D CH257522A (en) 1943-12-27 1945-11-03 Hydraulic pump.

Country Status (1)

Country Link
CH (1) CH257522A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271551B (en) * 1962-04-30 1968-06-27 Pleiger Maschf Paul Device for the optional distribution of the delivery fluid behind the outlet valves of a swash plate axial piston pump
DE1300830B (en) * 1960-04-12 1969-08-07 Applied Power Ind Inc Axial piston pump
DE2622010A1 (en) * 1976-05-18 1977-11-24 Rexroth Gmbh G L RADIAL PISTON PUMP
WO1984000403A1 (en) * 1982-07-13 1984-02-02 Karl Sauder Axial piston pump
EP0558389A1 (en) * 1992-02-28 1993-09-01 Hydro Rene Leduc Hydraulic piston pump with inlet valves
FR2688034A1 (en) * 1992-02-28 1993-09-03 Leduc Rene Hydro Sa Improvement to hydraulic pumps with pistons equipped with an intake valve
FR2692008A1 (en) * 1992-06-05 1993-12-10 Leduc Rene Hydro Sa Hydraulic pump with inlet valves incorporated into pistons
FR2693771A1 (en) * 1992-07-20 1994-01-21 Schlumberger Cie Dowell Pump comprising a partially hollow piston, and its applications especially in the oil industry.
US10947967B1 (en) 2020-03-11 2021-03-16 Halliburton Energy Services, Inc. Discharge valve disabler and pressure pulse generator therefrom
US10989188B2 (en) 2019-07-26 2021-04-27 Halliburton Energy Services, Inc. Oil field pumps with reduced maintenance
US11002120B1 (en) 2020-02-28 2021-05-11 Halliburton Energy Services, Inc. Dynamic packing seal compression system for pumps
US11073144B1 (en) 2020-02-14 2021-07-27 Halliburton Energy Services, Inc. Pump valve assembly
US11105327B2 (en) 2019-05-14 2021-08-31 Halliburton Energy Services, Inc. Valve assembly for a fluid end with limited access
US11231111B2 (en) 2019-05-14 2022-01-25 Halliburton Energy Services, Inc. Pump valve seat with supplemental retention
US11261863B2 (en) 2019-05-14 2022-03-01 Halliburton Energy Services, Inc. Flexible manifold for reciprocating pump
US11280326B2 (en) 2019-06-10 2022-03-22 Halliburton Energy Services, Inc. Pump fluid end with suction valve closure assist
US11441687B2 (en) 2019-05-14 2022-09-13 Halliburton Energy Services, Inc. Pump fluid end with positional indifference for maintenance
US11530750B2 (en) 2019-12-24 2022-12-20 Halliburton Energy Services, Inc. Horizontal balanced guided valve
US11560888B2 (en) 2019-05-14 2023-01-24 Halliburton Energy Services, Inc. Easy change pump plunger
US11739748B2 (en) 2019-05-14 2023-08-29 Halliburton Energy Services, Inc. Pump fluid end with easy access suction valve
US11952986B2 (en) 2019-05-02 2024-04-09 Kerr Machine Co. Fracturing pump arrangement using a plunger with an internal fluid passage
US11965503B2 (en) 2019-05-14 2024-04-23 Halliburton Energy Services, Inc. Flexible manifold for reciprocating pump

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1300830B (en) * 1960-04-12 1969-08-07 Applied Power Ind Inc Axial piston pump
DE1271551B (en) * 1962-04-30 1968-06-27 Pleiger Maschf Paul Device for the optional distribution of the delivery fluid behind the outlet valves of a swash plate axial piston pump
DE2622010A1 (en) * 1976-05-18 1977-11-24 Rexroth Gmbh G L RADIAL PISTON PUMP
WO1984000403A1 (en) * 1982-07-13 1984-02-02 Karl Sauder Axial piston pump
EP0558389A1 (en) * 1992-02-28 1993-09-01 Hydro Rene Leduc Hydraulic piston pump with inlet valves
FR2688034A1 (en) * 1992-02-28 1993-09-03 Leduc Rene Hydro Sa Improvement to hydraulic pumps with pistons equipped with an intake valve
US5354181A (en) * 1992-02-28 1994-10-11 Hydro Rene Leduc Hydraulic piston pumps equipped with suction valve
FR2692008A1 (en) * 1992-06-05 1993-12-10 Leduc Rene Hydro Sa Hydraulic pump with inlet valves incorporated into pistons
FR2693771A1 (en) * 1992-07-20 1994-01-21 Schlumberger Cie Dowell Pump comprising a partially hollow piston, and its applications especially in the oil industry.
EP0580196A1 (en) * 1992-07-20 1994-01-26 Sofitech N.V. Pump comprising a partially hollow piston
US11952986B2 (en) 2019-05-02 2024-04-09 Kerr Machine Co. Fracturing pump arrangement using a plunger with an internal fluid passage
US11441687B2 (en) 2019-05-14 2022-09-13 Halliburton Energy Services, Inc. Pump fluid end with positional indifference for maintenance
US11739748B2 (en) 2019-05-14 2023-08-29 Halliburton Energy Services, Inc. Pump fluid end with easy access suction valve
US11965503B2 (en) 2019-05-14 2024-04-23 Halliburton Energy Services, Inc. Flexible manifold for reciprocating pump
US11105327B2 (en) 2019-05-14 2021-08-31 Halliburton Energy Services, Inc. Valve assembly for a fluid end with limited access
US11231111B2 (en) 2019-05-14 2022-01-25 Halliburton Energy Services, Inc. Pump valve seat with supplemental retention
US11261863B2 (en) 2019-05-14 2022-03-01 Halliburton Energy Services, Inc. Flexible manifold for reciprocating pump
US11560888B2 (en) 2019-05-14 2023-01-24 Halliburton Energy Services, Inc. Easy change pump plunger
US11280326B2 (en) 2019-06-10 2022-03-22 Halliburton Energy Services, Inc. Pump fluid end with suction valve closure assist
US11885316B2 (en) 2019-06-10 2024-01-30 Halliburton Energy Services, Inc. Pump fluid end with suction valve closure assist
US10989188B2 (en) 2019-07-26 2021-04-27 Halliburton Energy Services, Inc. Oil field pumps with reduced maintenance
US11530750B2 (en) 2019-12-24 2022-12-20 Halliburton Energy Services, Inc. Horizontal balanced guided valve
US11073144B1 (en) 2020-02-14 2021-07-27 Halliburton Energy Services, Inc. Pump valve assembly
US11002120B1 (en) 2020-02-28 2021-05-11 Halliburton Energy Services, Inc. Dynamic packing seal compression system for pumps
US10947967B1 (en) 2020-03-11 2021-03-16 Halliburton Energy Services, Inc. Discharge valve disabler and pressure pulse generator therefrom

Similar Documents

Publication Publication Date Title
CH257522A (en) Hydraulic pump.
FR2807115A1 (en) VARIABLE CYLINDER COMPRESSOR WITH REDUCED NOISE GENERATION
FR2851305A3 (en) Valve piston device for compressor, has toroidal groove with inclined inner surface, formed around piston and loosely fitted with sealing ring
FR2535390A1 (en) IC engine valve deactivating mechanism
EP0017552B1 (en) Pump with pistons and cylinders in axial arrangement
FR2687434A1 (en) High efficiency compressor with small reexpansion volume
FR2802250A3 (en) Hydraulic power converter consists of main oil tank, hydraulic pumps, motor, and two-circuit hydraulic cylinder mechanism
US4392787A (en) Diaphragm pump
US20040244577A1 (en) Method and device at a hydrodynamic pump piston
FR2736688A3 (en) Swashplate pump for water jet cleaning unit
FR2756594A1 (en) PISTON PUMP DRIVEN BY THE SHAFT OF AN INTERNAL COMBUSTION ENGINE
FR2811733A1 (en) Pistons for use in fluid displacement apparatus such as swash plate-type compressors has a head portion with a aperture formed through it&#39;s surface
US2987051A (en) Water-operated oscillator
FR2693237A1 (en) Waterproof compressor with improved relief valve.
FR2830055A1 (en) High pressure fuel supply apparatus for internal combustion engines, has plunger reciprocating axially in a sleeve to form fuel pressurizing chamber and valve displacing fuel into high pressure passageway
FR2805313A1 (en) PNEUMATICALLY DRIVEN HYDRAULIC PUMP
FR2492469A1 (en) PISTON ASSEMBLY FOR A FLUID MECHANISM WITH A REACTION PLATE AND ITS SLIPPER SKATE
FR2556050A1 (en) Liquid hydrogen plunger pump
JPS6119983A (en) Plunger pump
EP0466561A1 (en) Hydraulic machine with rotating cylinder block
FR2797471A1 (en) SINGLE-CYLINDER HIGH PRESSURE PUMP FOR SUPPLYING A COMMON RAMP INJECTION SYSTEM
EP0180510B1 (en) Hydraulic piston pump with positively driven inlet valves
FR2749363A1 (en) PRESSURE FLUID SPRING COMPRESSOR
JPS5916543Y2 (en) Plunger type reciprocating pump
JPS5922303Y2 (en) reciprocating liquid pump