EP0089296A1 - Hydraulische Axialkolbenpumpe mit Schrägscheibe und einer Einrichtung zum Selbstansaugen - Google Patents

Hydraulische Axialkolbenpumpe mit Schrägscheibe und einer Einrichtung zum Selbstansaugen Download PDF

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Publication number
EP0089296A1
EP0089296A1 EP83400547A EP83400547A EP0089296A1 EP 0089296 A1 EP0089296 A1 EP 0089296A1 EP 83400547 A EP83400547 A EP 83400547A EP 83400547 A EP83400547 A EP 83400547A EP 0089296 A1 EP0089296 A1 EP 0089296A1
Authority
EP
European Patent Office
Prior art keywords
pump
bias plate
pistons
face
stud
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Withdrawn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
EP83400547A
Other languages
English (en)
French (fr)
Inventor
Louis-Claude Porel
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.)
Hydro Rene Leduc SA
Original Assignee
Hydro Rene Leduc SA
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
Priority claimed from FR8203819A external-priority patent/FR2523655B1/fr
Priority claimed from FR8304025A external-priority patent/FR2542382A2/fr
Application filed by Hydro Rene Leduc SA filed Critical Hydro Rene Leduc SA
Publication of EP0089296A1 publication Critical patent/EP0089296A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F04B53/06—Venting

Definitions

  • the present invention relates to an improvement to hydraulic pumps with a bias plate in which the pistons are arranged parallel to the axis of the pump and are driven back and forth by means of a bias plate also called a swash plate.
  • the pistons being hollow and bearing against the inclined face of the bias plate by means of studs which, during the cycle, pass over a circular arc-shaped lunula, engraved on said face of the bias plate , the supply being made by this lunula and through the studs up towards the inside of the pistons during the path traveled by said studs on the lunula.
  • these pumps have the disadvantage of not being able to start alone and must therefore have a pressurized supply, which is obtained either by putting the tank under air or gas pressure, or by placing the tank above the pump.
  • the inability of these pumps to self-prime is due to the fact that the volumetric ratio between the two extreme positions of the pistons is not sufficient to compress the air enough, when the pump is empty, to have a pressure strong enough to lift the valves.
  • This offset is determined as a function of the maximum pressure supplied by the pump and the speed of rotation of the pump: it makes it possible to avoid the phenomena of decompression of the liquid in the supply circuit; but has the drawback of reducing the volumetric efficiency of the pump, since the suction phase is reduced by the same amount.
  • the bias plate is at variable inclination, which makes it possible to vary at will the stroke of the pistons and therefore the flow rate and the pressure of the pump, very high pressures can be obtained in the vicinity of the zero flow rate and it is therefore forced to provide a very large angular offset to avoid decompression phenomena: the pump flow is then insufficient for higher inclinations of the plate.
  • the present invention relates to a very simple device which allows both: to allow priming of the pump when the tank is located at a level below that of the pump, the latter being filled with air; avoid the phenomena of liquid decompression with discharge of the compressed liquid into the supply circuit; and to ensure a minimum circulation of the fluid regardless of the value of the angle of the bias plate, which ensures an evacuation of excess calories.
  • the pump according to the present invention is characterized in that the bias plate comprises, a little downstream of the line of greatest slope, an orifice provided with a low-tared non-return valve communicating with the tank so that, each piston is purged at the moment when its stud passes over this orifice, either of the compressed air which it contains, or of a small quantity of liquid at high pressure, which has the effect that when the pump is filled with air, it starts alone and when it is under pressure the pistons are at least partially decompressed and that a minimum circulation of fluid out of the pump towards the tank is ensured at the lowest flow rates.
  • the pump shown in Figures 1 and 2 is of the type known as a fixed plate and a rotating barrel. It consists of a casing 1 inside which is disposed a fixed bias plate 2 pierced with a central bore 3, through which passes a motor shaft 4 secured to a barrel 5 in the mass of which are pierced a plurality of 'bores 6 in which hollow pistons 7 move constrained by springs 10.
  • Each piston 7 is provided with a spherical head 8 traversed by a channel 9, each spherical head 8 resting on a movable stud 11, which itself rests on the front face 2a of the bias plate 2.
  • lunula On the face 2a of the bias plate 2 is hollowed out a groove 12, called the lunula.
  • the chamber 13 in which the bias plate 2 is located is in normal operation filled with hydraulic fluid.
  • a non-return valve 22 whose return spring 23 is slightly calibrated, this valve 22 communicating on the one hand with an orifice 24, placed on the path, studs 11 and on the other hand with a pipe 25 opening into the outlet orifice 21.
  • the orifice 24 is placed in such a way that it opens out inside a stud 11 when the latter is exactly at the most top of the line of greatest slope xy of the front face 2a of the bias plate 2.
  • this orifice 24 is offset from the line xy by a length equal to the radius of the internal hole of stud 11.
  • each piston 7 compresses air; this air is at its maximum pressure when the piston reaches its top dead center ( Figure 1); just at this moment, the stud 11 passes over the orifice 24 and the compressed air lifts the valve 22 which is constrained by a weak spring and this air is evacuated by the pipe 25. The air is thus little little evacuated and the liquid is drawn into line 14.
  • a single check valve 22 is therefore sufficient, placed in the immediate vicinity of the highest point of the line xy, so that all the pistons come, one after the other, to discharge the air which they have compressed.
  • FIGS 3 and 4 show an alternative embodiment in which the same elements have the same references.
  • the non-return valve 22 communicates the orifice 24 with a pipe 28 which opens into a pipe 29, coaxial with the shaft 4, this pipe 29 communicating by means of a pipe 30 which opens into a space annular 31 delimited by two rotary joints 32, with a drain 33 which terminates in the reservoir 15.
  • this second embodiment is analogous to that of the first embodiment, with the only difference that the air compressed by the pistons 7 is discharged through the drain 33 in the direction of the reservoir 15 so as not to subject the rotating seals 32 at high pressures.
  • the high outlet pressure is applied by the pipe 25 at the rear of the valve 22 which is then automatically equipressed each time a stud 11 passes over the orifice 24.
  • FIGS. 3 and 4 when the pump is primed, each time a stud 11 passes over the orifice 24, a small jet of pressurized liquid is directed towards the drain 33, so that the efficiency of the pump is very slightly reduced.
  • FIGS 5 and 5 show an alternative embodiment of the pump of Figure 1, the bias plate 2 being fixed in rotation, but carried by means known in themselves, allowing to vary the inclination of said bias plate.
  • the bias plate is in fact mounted in the casing 1 by means of a shaft 34 so as to be able to tilt under the action of a pusher 35.
  • This arrangement known per se, allows the inclination of the bias plate 2 to be varied.
  • the orifice 24 communicates with the reservoir via a pipe 29 formed inside the shaft 34 carrying the bias plate; this pipe communicates outside the pump with a pipe 33 4 which leads to the tank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP83400547A 1982-03-17 1983-03-16 Hydraulische Axialkolbenpumpe mit Schrägscheibe und einer Einrichtung zum Selbstansaugen Withdrawn EP0089296A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8203819A FR2523655B1 (fr) 1982-03-17 1982-03-17 Pompe hydraulique a pistons axiaux commandes par un plateau biais, munis de moyens d'autoamorcage
FR8203819 1982-03-17
FR8304025A FR2542382A2 (fr) 1983-03-11 1983-03-11 Pompe hydraulique a pistons axiaux commandes par un plateau biais, munie de moyens d'auto-amorcage
FR8304025 1983-03-11

Publications (1)

Publication Number Publication Date
EP0089296A1 true EP0089296A1 (de) 1983-09-21

Family

ID=26222801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400547A Withdrawn EP0089296A1 (de) 1982-03-17 1983-03-16 Hydraulische Axialkolbenpumpe mit Schrägscheibe und einer Einrichtung zum Selbstansaugen

Country Status (2)

Country Link
EP (1) EP0089296A1 (de)
ES (1) ES270928Y (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010035103A1 (de) 2010-08-23 2012-02-23 Catena Additives Gmbh & Co. Kg Flammschutzmittelzusammensetzungen enthaltend Triazin-interkalierte Metall-Phosphate

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744469A (en) * 1953-06-05 1956-05-08 Edward J Schaefer Valve structure for preventing air lock in pumps
FR1184849A (fr) * 1957-10-18 1959-07-27 Rech Etudes Production Sarl Pompes à pistons auto-purgeurs
FR1591836A (de) * 1967-11-20 1970-05-04
DE2011415A1 (de) * 1970-03-11 1971-09-23 Langen & Co, 4000 Düsseldorf Anordnung zum Entlüften von hohlgebohrten Kolben von hydraulischen Kolbenmaschinen
FR2160685A1 (de) * 1971-11-17 1973-06-29 Frieseke & Hoepfner Gmbh
FR2163084A5 (de) * 1971-11-25 1973-07-20 Langen & Co

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744469A (en) * 1953-06-05 1956-05-08 Edward J Schaefer Valve structure for preventing air lock in pumps
FR1184849A (fr) * 1957-10-18 1959-07-27 Rech Etudes Production Sarl Pompes à pistons auto-purgeurs
FR1591836A (de) * 1967-11-20 1970-05-04
DE2011415A1 (de) * 1970-03-11 1971-09-23 Langen & Co, 4000 Düsseldorf Anordnung zum Entlüften von hohlgebohrten Kolben von hydraulischen Kolbenmaschinen
FR2160685A1 (de) * 1971-11-17 1973-06-29 Frieseke & Hoepfner Gmbh
FR2163084A5 (de) * 1971-11-25 1973-07-20 Langen & Co

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010035103A1 (de) 2010-08-23 2012-02-23 Catena Additives Gmbh & Co. Kg Flammschutzmittelzusammensetzungen enthaltend Triazin-interkalierte Metall-Phosphate
WO2012025362A1 (de) 2010-08-23 2012-03-01 Catena Additives Gmbh & Co. Kg Flammschutzmittelzusammensetzungen enthaltend triazin-interkalierte metall-phosphate
EP3321343A1 (de) 2010-08-23 2018-05-16 J.M. Huber Corporation Flammschutzmittelzusammensetzungen enthaltend triazin-interkalierte metall-phosphate

Also Published As

Publication number Publication date
ES270928U (es) 1985-07-01
ES270928Y (es) 1986-04-01

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Effective date: 19850916

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Inventor name: POREL, LOUIS-CLAUDE