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WO1996019666A1 - Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe - Google Patents

Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe Download PDF

Info

Publication number
WO1996019666A1
WO1996019666A1 PCT/DK1994/000473 DK9400473W WO9619666A1 WO 1996019666 A1 WO1996019666 A1 WO 1996019666A1 DK 9400473 W DK9400473 W DK 9400473W WO 9619666 A1 WO9619666 A1 WO 9619666A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
oblique
pump
piston
front surface
Prior art date
Application number
PCT/DK1994/000473
Other languages
English (en)
Inventor
Jørn Gunnar JENSEN
Original Assignee
Kew Industri A/S
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 Kew Industri A/S filed Critical Kew Industri A/S
Priority to AU13096/95A priority Critical patent/AU1309695A/en
Priority to PCT/DK1994/000473 priority patent/WO1996019666A1/fr
Publication of WO1996019666A1 publication Critical patent/WO1996019666A1/fr

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
    • F04B1/12—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
    • 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
    • F04B1/14—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 having stationary cylinders
    • F04B1/141—Details or component parts
    • F04B1/146—Swash plates; Actuating elements
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element

Definitions

  • the present invention relates to a piston pump of the kind set forth in the preamble of claim l.
  • a pump of the kind referred to above is disclosed in the German published patent application No. 1,918,406.
  • the angle-adjustment means intercon ⁇ necting the two oblique discs are constituted by a pawl- and-ratchet mechanism, operable to carry out a stepwise adjustment by reversing the direction of rotation of the drive shaft.
  • this known pump comprises no facility for continuous automatic regulation of the displacement, such as depending on the delivery pressure.
  • WO 90/03518 discloses an axial-piston hydrostatic machine comprising a pair of inclined discs in axially opposing relationship to control the reciprocating motion of the pistons, one of the discs being rotatable relative to the other under the action of an elastic member which opposes a relative angular shift of the discs tending to modify the displacement, so that the latter is automatically regulated as a func ⁇ tion of the torque applied to the drive shaft, i.e. a function of the delivery pressure, if the machine is a pump.
  • This machine requires two opposing pistons in each cylinder, obviously increasing the cost compared to a machine with only one piston per cylinder, and special measures have to be taken to provide the requisite exter ⁇ nal connections to the cylinders, as they do not possess the customary closed end that may be used for this pur- pose .
  • the input drive torque is applied to the second oblique disc and transferred to the first oblique disc co-operating with the pistons through the elastic member, thus allowing the first disc to yield rotatably under the influence of the tangential component of the reaction force exerted upon the first disc by the pistons, this reaction force obviously being directly proportional to the delivery pressure of the pump.
  • the present invention relates also to a high-pressure cleaner of the kind comprising an axial-piston pump feed ⁇ ing liquid to a cleaning gun ejecting a liquid jet, and according to the invention this cleaner comprises a pump according to any one or any of the claims 1-4.
  • Figure 2 is a view similar to Figure 1, but shows the pump operating with a relatively higher delivery pressure resulting in a correspondingly reduced displacement.
  • the pump shown in Figures 1 and 2 is an axial-piston pump comprising a frame or housing 1 with a number of mutually parallel cylinders 2, of which only two are shown, in which a corresponding number of pistons 3 with protruding end parts 4 are slidingly supported so as to co-operate with the associated cylinder 2 in the normal manner.
  • the pistons 3 are made to reciprocate in the cylinders by a rotating oblique-disc arrangement comprising - a parallel-sided disc 14 with a front surface 15 and a rear surface 16, the end parts 4 being kept in abutment with the front surface 15 by said springs (not shown) , the rear surface 16 thereby being held in abutment with a front surface 5 on a first oblique disc 6, bearing rollers 17 being interposed between the rear sur ⁇ face 16 on the parallel-sided disc 14 and the front surface 5 on the first oblique disc 6, the rear surface 7 of which is held in abutment with a front bearing surface 8 on a second oblique disc 9, bearing rollers 13 being interposed between the rear surface 7 on the first disc 6 and the front surface 8 on the second disc 9.
  • a rotating oblique-disc arrangement comprising - a parallel-sided disc 14 with a front surface 15 and a rear surface 16, the end parts 4 being kept in abutment with the front surface 15 by said springs (not shown)
  • the second disc 9 is adapted to be driven for rotation about an axis 10 by a drive member 11 adapted to be driven by a suitable motor (not shown) .
  • the pistons 3 would reciprocate with a constant stroke, the pump thus having a constant displace ⁇ ment.
  • the first oblique disc 6 is, however, connected to the drive member 11 through an elastic member, in the exemplary embodiment shown in the form of a torsionally elastic rod 12, so that the first oblique disc 6 is able to "give" through a certain angle relative to the second oblique disc 9, provided that a suitable torque is exerted upon it.
  • the requisite tangential force for exerting a torque on the first oblique disc 6 is constituted by the tangential component of the reaction force exerted on the parallel- sided disc 14 by all pistons carrying out a pumping stroke, i.e. working against the delivery pressure of the pump. Obviously, the higher the delivery pressure, the greater the angle, through which the first oblique disc 6 will be rotated in a "lagging" direction towards a position of reduced stroke, such as shown in Figure 2.
  • the cylinders 2 are arranged parallel to the axis of rotation 10 of the drive member 11, but the invention may also be applied to pumps in which the cylinders extend at some acute angle with the axis of rotation.
  • the elastic member connecting the first oblique disc 6 to the second oblique disc 9 is constituted by a torsionally elastic rod 12, but it does also lie within the scope of the invention to use elastic means of a different con ⁇ struction, such as a helical spring coaxial with the drive member 11.

Landscapes

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

Abstract

Dans la pompe de type à piston axial ou similaire, le disque oblique (6), dont la surface avant (5) détermine la longueur de course des pistons (3), comprend une surface arrière (7) formant un angle aigu vif avec la surface avant (5) et coopérant avec une surface avant oblique (8) sur un deuxième disque oblique (9) mis en rotation par un élément d'entraînement (11). Le premier disque (6) est relié, en vue de sa rotation, au deuxième disque (9) par un élément élastique (12) de manière à 'donner' lors de l'augmentation de la force de réaction des pistons (3) due à l'augmentation de la pression de sortie, ce qui amène la surface avant (5) à 'basculer' plus près d'une orientation radiale. Cette configuration permet d'assurer un contrôle des déplacements automatique simple et peu onéreux. L'invention traite également d'un appareil de nettoyage comprenant cette pompe.
PCT/DK1994/000473 1994-12-19 1994-12-19 Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe WO1996019666A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU13096/95A AU1309695A (en) 1994-12-19 1994-12-19 13115with variable displacement, and high-pressure cleaner including such a pump
PCT/DK1994/000473 WO1996019666A1 (fr) 1994-12-19 1994-12-19 Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK1994/000473 WO1996019666A1 (fr) 1994-12-19 1994-12-19 Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe

Publications (1)

Publication Number Publication Date
WO1996019666A1 true WO1996019666A1 (fr) 1996-06-27

Family

ID=8154983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000473 WO1996019666A1 (fr) 1994-12-19 1994-12-19 Pompe a cylindree variable, et appareil de nettoyage comprenant ce type de pompe

Country Status (2)

Country Link
AU (1) AU1309695A (fr)
WO (1) WO1996019666A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997029281A1 (fr) * 1996-02-08 1997-08-14 Whitemoss, Inc. Procede et appareil de commande de pompe axiale
GB2329940A (en) * 1997-06-09 1999-04-07 Saphirwerk Ind Prod Apparatus for the metered delivery of fluids
US5979294A (en) * 1996-02-08 1999-11-09 Whitemoss, Inc. Method and apparatus for controlling axial pump
WO2003087579A1 (fr) * 2002-04-16 2003-10-23 Ernst Beck Systeme d'entrainement pour une machine, notamment pour une pompe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486454A (en) * 1968-04-16 1969-12-30 Borg Warner Piston pump with remote control of displacement
WO1990003518A1 (fr) * 1988-09-27 1990-04-05 Gualtiero Maurer Machine hydrostatique a piston axial, a deplacement variable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486454A (en) * 1968-04-16 1969-12-30 Borg Warner Piston pump with remote control of displacement
WO1990003518A1 (fr) * 1988-09-27 1990-04-05 Gualtiero Maurer Machine hydrostatique a piston axial, a deplacement variable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997029281A1 (fr) * 1996-02-08 1997-08-14 Whitemoss, Inc. Procede et appareil de commande de pompe axiale
US5979294A (en) * 1996-02-08 1999-11-09 Whitemoss, Inc. Method and apparatus for controlling axial pump
GB2329940A (en) * 1997-06-09 1999-04-07 Saphirwerk Ind Prod Apparatus for the metered delivery of fluids
GB2329940B (en) * 1997-06-09 2001-06-06 Saphirwerk Ind Prod Apparatus for the metered delivery of fluids
WO2003087579A1 (fr) * 2002-04-16 2003-10-23 Ernst Beck Systeme d'entrainement pour une machine, notamment pour une pompe

Also Published As

Publication number Publication date
AU1309695A (en) 1996-07-10

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