EP2049800B1 - Pompe de circulation - Google Patents

Pompe de circulation Download PDF

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Publication number
EP2049800B1
EP2049800B1 EP07786069A EP07786069A EP2049800B1 EP 2049800 B1 EP2049800 B1 EP 2049800B1 EP 07786069 A EP07786069 A EP 07786069A EP 07786069 A EP07786069 A EP 07786069A EP 2049800 B1 EP2049800 B1 EP 2049800B1
Authority
EP
European Patent Office
Prior art keywords
pressure
input
feed pump
output
pump according
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.)
Not-in-force
Application number
EP07786069A
Other languages
German (de)
English (en)
Other versions
EP2049800A1 (fr
Inventor
Willi Schneider
Torsten Helle
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.)
Joma Polytec GmbH
Original Assignee
Joma Polytec GmbH
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 DE200610039698 external-priority patent/DE102006039698B3/de
Priority claimed from DE200620015508 external-priority patent/DE202006015508U1/de
Application filed by Joma Polytec GmbH filed Critical Joma Polytec GmbH
Publication of EP2049800A1 publication Critical patent/EP2049800A1/fr
Application granted granted Critical
Publication of EP2049800B1 publication Critical patent/EP2049800B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • 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
    • F04B49/002—Hydraulic systems to change the pump delivery
    • 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
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/21—Pressure difference

Definitions

  • the invention relates to a feed pump for hydraulic media.
  • Feed pumps have a delivery volume, which depends on the speed of the feed pump and its drive. Depending on the system resistance of the consumer or the facilities consuming the pumped hydraulic medium, the system pressure also depends on the delivery volume. In general, there is a desire to keep the system pressure at a constant level or at least within a predetermined range.
  • the invention is therefore based on the object, a delivery pump, in particular a pump control to propose, which is easier to set to a desired system pressure.
  • FIG. 1 shown block diagram shows a total of 10 designated feed pump whose volume is adjustable.
  • the feed pump 10 has an input 12 which is connected to a tank 14.
  • the delivery pressure P 1 is present and at the output 16, a pressure relief valve 18 is connected.
  • This pressure relief valve 18 is also connected to the tank 14. If the delivery pressure P 1 exceeds the opening pressure of the overpressure valve 18, eg 12 bar, then hydraulic medium flows into the tank 14.
  • the outlet 16 is connected to a pressure-reducing element 20, for example a filter 22, a diaphragm or the like.
  • the system pressure P 2 is applied .
  • the subsidized by the pump 10 hydraulic medium reaches a consumer 26, for example, to an internal combustion engine of a motor vehicle.
  • the hydraulic medium flows to the consumer 26 into the tank 14. Due to the pressure reducing element 20, the system pressure P 2 is smaller than the delivery pressure P 1 .
  • the output 16 of the feed pump 10 is also connected to a first input 28 of a pump controller 30, the second input 32 is connected to the output 24 of the pressure reducing element 20.
  • the reference numeral 46, the minimum pressure of the pump controller 30 is designated.
  • the pump controller 30 adjusts the feed pump 10 in the direction of minimum delivery when the pressure at the second input 32 is greater than the pressure at the first input 28.
  • the voltage applied to the second input 32 pressure P 2 must exceed at least a minimum pressure, for example, 2 bar. Exceeds the voltage applied to the first input 28 or the minimum pressure of, for example, 2 bar the system pressure P 2 , the pump controller 30 adjusts the feed pump 10 in the direction of maximum delivery. As long as the system pressure P 2 is below the minimum pressure, the feed pump 10 is moved in the direction of maximum delivery.
  • a pressure limiter 34 is connected, the first input 36 is connected to the first input 28 of the pump controller 30 and the second input 38 is connected to the tank 14.
  • the system pressure P 2 is applied .
  • the desired size 42 of the pressure limiter 34 is in particular adjustable and is 5.5 bar, for example. This means that the pressure limiter 34 connects the first input 36 to the second input 38 when the control input 40, a pressure exceeding the target size 42 is applied, ie when the system pressure P 2 exceeds the target size. Hydraulic medium flows into the tank 14. As a result, the pressure at the first input 28 of the pump regulator 30 is reduced below the system pressure P 2 , so that the pump regulator 30 adjusts the feed pump 10 in the direction of minimum delivery.
  • the system pressure P 2 also drops until it drops below the value of the delivery pressure P 1 , whereupon the pump regulator 30 is again adjusted in the direction of maximum delivery.
  • the system pressure P 2 is thus maintained between the minimum pressure and the desired size 42.
  • From the pressure limiter 34 so hydraulic fluid is discharged into the tank 14, which has not yet passed the pressure reducing element 20.
  • the system pressure P 2 is changed only by an adjustment of the feed pump 10.
  • a throttle 48 is provided, which is in particular adjustable.
  • control piston 44 of the pressure limiter 34 is shown, wherein the control piston 44 is shown in its the first input 36 from the second input 38 separating position.
  • the feed pump 10 is a vane pump 50, whose rotor 52 is driven by a shaft 54 and in radial slots 56 carries a plurality of vanes 58, which rotate about sliding shoes 60 on an inner peripheral surface 62 of a stator 64.
  • the stator 64 is pivotally mounted and has a pivot axis 66 and two pistons 68 and 70, the piston 68 and 70 of the pump controller 30 in the FIG. 1 correspond. By pivoting the stator 64 about the pivot axis 66 in the direction of the arrows 71, the delivery rate of the feed pump 10 is changed.
  • the second input 38 of the pressure limiter 34 When in the FIG. 3 the second input 38 of the pressure limiter 34 is connected to the control input 40, so that when the pressure limiter 34 is open, the pressure applied to the first input 36 is transferred to the second input 38.
  • Such a circuit has the significant advantage that it works lossless. From the FIG. 3a It can be seen that the second input 38 is connected directly to the control input 40 and that a displacement of the piston 44 causes a connection of the two inputs 36 and 38.
  • the output 24 of the pressure reducing element 20 is connected to an electromagnetically driven control valve 72 (a 3/2-way valve).
  • the output 24 of the pressure reducing element 20 via the control valve 72 to a second control input 74 of the pressure limiter 34 is connected.
  • actuating forces for the pressure limiter 34 thus act on the first control input 40 applied system pressure P 2 with the force acting within the control piston 44 force F 1 and the voltage applied to the second control input 74 system pressure P 2 with the force acting within the control piston 44 force F 2nd
  • the control piston 44 is in the FIG. 4a shown, from which it is clearly visible that the force F 2 is greater than the force F 1 due to the larger effective piston area, which acts only on an annular surface.
  • the control valve 72 is driven, for example, by a motor computer 76, whereby a map control of the feed pump 10 is made possible.
  • the system pressure P 2 can be set to any value between the minimum pressure (pump controller 30) and the desired size 42 (pressure limiter 34).
  • the FIG. 4 also shows a shut-off valve 78, which is controlled by the system pressure P 2 and whose input 80 is connected to the output 82 of the control valve 72.
  • the output 84 of the shut-off valve 78 is connected to the second input 32 of the pump controller 30 and to the control input 40 of the pressure limiter 34. Accordingly, the system pressure P 2 is present at the control input 40.
  • the second control input 74 of the pressure limiter 34, the system pressure P 2 and the pressure limiter 34 opens because the force F 2 due to the system pressure P 2 at the second control input 74 in addition to the force F 1 of the system pressure P 2 at the control input 40th added, so that the two inputs 36 and 38 are connected to each other.
  • the pump controller 30 adjusts the feed pump 10 in the direction of minimum delivery.
  • the control valve 72 is switched over and closes the second control input 74.
  • the system pressure P 2 then rises until it reaches the desired value 42 or until the engine computer 76 in turn controls the control valve 72 controls and opens. In this way, the system pressure P 2 according to a map control within a predetermined bandwidth can be set to desired different values.
  • FIG. 5 shows the feed pump 10 with in the FIG. 4 illustrated circuit.
  • the pressure limiter 34 has the second control input 74, which is connected both to the control valve 72 and to the shut-off valve 78.
  • the control valve 72 is actuated by the engine computer 76 and connects the second control input 74 via the shut-off valve 78 to the outlet 24 of the pressure-reducing element 20.
  • FIG. 7 shows the position of the circuit in case of failure of the engine computer 76 and the map control.
  • the control valve 72 is not activated and closes the output 24 in the direction of the shut-off valve 78 and the pressure limiter 34. Accordingly, there is no pressure at the second control input 74, so that the force F 2 is zero.
  • the second input 32 of the pump controller 30 is also no pressure, so that it assumes the position for maximum promotion.
  • the system pressure P 2 increases until the shut-off valve 78 is changed over and connects the output 24 with both the pump regulator 30 and with the pressure limiter 34.
  • the control input 40 is now the system pressure P 2 and the pressure limiter 34 opens as soon as the pressure of the target size 42 is exceeded.
  • the pump controller 30 is adjusted towards minimum promotion. This means that in the event of failure of the engine computer 76, the system pressure P 2 is determined by the desired value 42. Also in this variant of the second input 38, as in the variant of Figures 3 and 6 , are connected to the control input 40. This variant would then also lossless.
  • FIG. 8 shows a further variant of the invention, wherein hereinafter only on the differences compared to the variant of FIG. 1 will be received.
  • the pressure limiter 34 is formed by a hydraulically driven control valve 86 (a 4/2-way valve), whose one, in particular adjustable control value 42 is for example 5.5 bar.
  • the other control variable is supplied by the system pressure P 2 , which is applied to the input 88.
  • the control valve 86 In the in FIG. 8 shown position of the control valve 86, the second input 32 of the pump controller 30 to the tank 14 and the first input 28 of the pump controller 30 to the output 16 of the feed pump 10 is connected.
  • the pump controller 30 is thereby adjusted in the direction of maximum delivery.
  • FIG. 9 shows this variant in an embodiment to which the above-mentioned components are connected. The same components are provided with the same reference numerals.
  • the second input 32 of the pump regulator 30 with the tank 14 and the outlet 16 of the delivery pump 10 are connected directly to the consumer 26.
  • the pump controller 30 is moved in the direction of maximum delivery, as long as the delivery pressure P 1 is below the manipulated variable 42. If the delivery pressure P 1 exceeds the manipulated variable 42, then the output 24 of the pressure reducing element 20 with the tank 14 and the output 16 of the feed pump 10 with the second input 32 of the Pump controller 30 is connected, so that the pump controller 30 is adjusted in the direction of minimum promotion, since at the first input 28, a pressure is applied, which is smaller than the delivery pressure P 1 due to the throttle 48.
  • the FIG. 11 shows this variant in one embodiment.
  • the pressure limiter 34 is formed as a 4/2-way valve 90.
  • the first control input 40 with the shut-off valve 78 and the second control input 74 are connected both to the control valve 72 and to the shut-off valve 78.
  • the directional control valve 90 reverses and connects the first input 28 to the tank 14, so that the pump regulator 30 is adjusted in the direction of minimum delivery.
  • the 4/2-way valve 90 connects the 4/2-way valve 90 to the second input 32 of the pump controller 30 to the tank, so that the pump controller 30 is initially adjusted in the direction of maximum promotion.
  • the output 24 is connected to the system pressure P 2 to the first input 28 of the pump controller 30.
  • the directional valve 90 reverses and connects the second input 32 of the pump regulator 30 to the output 24 and the first input 28 of the pump regulator 30 to the tank 14, so that the pump regulator 30 is adjusted in the direction of minimum funding.
  • FIG. 16 shows a variant of the invention according to FIG. 8 , wherein the pressure limiter 34 is formed as a 4/2-way valve 86 and not only via the input 88, to which the system pressure P 2 is applied, but is also driven in parallel by means of the motor computer 76 electromagnetically.
  • the first input 28 of the pump controller 30 to the tank 14 and the second input 32 of the pump controller 30 to the output 24 is connected.
  • the pump regulator 30 is adjusted in the direction of minimum delivery.
  • the 4/2-way valve 86 at which point the second input 32 of the pump controller 30 is connected to the tank 14 and the first input 28 to the output 24.
  • the pump regulator 30 is adjusted in the direction of maximum delivery.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Transmission Device (AREA)

Abstract

L'invention concerne une pompe de circulation pour fluides hydrauliques avec une entrée (12) et une sortie (16), une pression de refoulement s'appliquant sur la sortie, avec un élément de réduction de pression (20) relié à la sortie, sur la sortie duquel (24) s'applique la pression système et qui est relié à un récepteur (26), la sortie étant reliée à la première entrée (28) d'un régulateur de pompe (30), dont la deuxième entrée (32) est reliée à la sortie de l'élément de réduction de pression, et le régulateur de pompe réglant la pompe de circulation (10) en direction de la circulation maximale lorsque la pression système (p2) est inférieure à une pression minimale (46) ou la pression système est inférieure à la pression de refoulement, et un limiteur de pression (34) étant monté en parallèle du régulateur de pompe de telle sorte que, sur sa première entrée (36) s'applique la pression de refoulement et sur son entrée de commande (40), la pression système, le limiteur de pression s'ouvrant lorsque la pression de refoulement est supérieure à une grandeur de consigne (42).

Claims (15)

  1. Pompe d'alimentation (10) pour des fluides hydrauliques, dotée d'une entrée (12) et d'une sortie (16), une pression d'alimentation (P1) s'appliquant à la sortie (16), d'un élément réducteur de pression (20) relié à la sortie (16), à la sortie (24) duquel s'applique la pression de système (P2) et la sortie (24) étant reliée à un consommateur (26), la sortie (24) étant reliée à la première entrée (28) d'un régulateur de pompe (30), dont la seconde entrée (32) est reliée à la sortie (24) de l'élément réducteur de pression (20), et le régulateur de pompe (30) positionnant la pompe d'alimentation (10) en direction de l'alimentation maximale, lorsque la pression du système (P2) est inférieure à une pression minimale (46) ou lorsque la pression du système (P2) est inférieure à la pression s'appliquant sur la première entrée (28), caractérisée en ce qu'un limiteur de pression (34) est branché parallèlement au régulateur de pompe (30), de telle sorte que la pression s'appliquant sur la première entrée (28) du régulateur de pompe (30) et la pression du système (P2) s'appliquent respectivement sur sa première entrée (36) et sur son entrée de commande (40), le régulateur de pression (34) s'ouvrant lorsque la pression du système (P2) est supérieure à une grandeur prescrite (42).
  2. Pompe d'alimentation selon la revendication 1, caractérisée en ce que l'élément réducteur de pression (20) est un filtre (22) ou similaire.
  3. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce que la pression minimale (46) est 1,5 bar à 3 bars, en particulier 2 bars, et/ou est réglable pendant le fonctionnement de réglage ou en cas d'arrêt du réglage.
  4. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce que la grandeur prescrite (42) est 4 bars à 8 bars, en particulier 5,5 bars, et/ou est réglable pendant le fonctionnement de réglage ou en cas d'arrêt du réglage.
  5. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un clapet d'étranglement (48) est intercalé entre la sortie (16) de la pompe d'alimentation (10) et la première entrée (28) du régulateur de pompe (30).
  6. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce qu'après la sortie (16) de la pompe d'alimentation (10) est prévue une vanne de surpression (18), qui s'ouvre en particulier à 9 bars jusqu'à 15 bars, de préférence à 12 bars, et/ou à une pression réglable pendant le fonctionnement de réglage ou en cas d'arrêt du réglage, par exemple dans une cuve (14).
  7. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce que la pression du système (P2) s'applique sur la seconde entrée (38) du limiteur de pression (34) et le limiteur de pression (34) ouvert relie la première entrée (36) à la seconde entrée (38).
  8. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce que le limiteur de pression (34) présente une seconde entrée de commande (74), en particulier les deux entrées de commande (40 et 74) du limiteur de pression (34) étant branchées l'une derrière l'autre au plan hydraulique.
  9. Pompe d'alimentation selon la revendication 8, caractérisée en ce que la seconde entrée de commande (74) du limiteur de pression (34) présente une multiplication de la force de pression par rapport à la première entrée de commande (40).
  10. Pompe d'alimentation selon la revendication 8 ou 9, caractérisée en ce qu'une vanne de commande (72) reliant la sortie (24) de l'élément réducteur de pression (20) à la seconde entrée de commande (74) du limiteur de pression (34) est prévue, en particulier la sortie (82) de la vanne de commande (72) étant reliée à la seconde entrée (74) du limiteur de pression (34).
  11. Pompe d'alimentation selon la revendication 10, caractérisée en ce que la vanne de commande (72) peut être activée au plan hydraulique et/ou au plan électromagnétique et/ou au moyen d'une commande de moteur (76) d'un véhicule automobile.
  12. Pompe d'alimentation selon la revendication 10 ou 11, caractérisée en ce qu'une vanne d'arrêt (78) est prévue entre la sortie (82) de la vanne de commande (72) et la première entrée de commande (40) du limiteur de pression (34).
  13. Pompe d'alimentation selon la revendication 12, caractérisée en ce que la vanne d'arrêt (78) présente une entrée de commande, sur laquelle s'applique la pression du système (P2).
  14. Pompe d'alimentation selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une vanne de commande (72) reliant la seconde entrée (32) du régulateur de pompe (30) à la cuve, en particulier une vanne à 4/2 voies (90), est prévue.
  15. Pompe d'alimentation selon la revendication 14, caractérisée en ce que la vanne de commande (72) peut être activée au plan hydraulique et/ou électromagnétique.
EP07786069A 2006-08-21 2007-07-14 Pompe de circulation Not-in-force EP2049800B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200610039698 DE102006039698B3 (de) 2006-08-21 2006-08-21 Förderpumpe
DE200620015508 DE202006015508U1 (de) 2006-10-10 2006-10-10 Förderpumpe
PCT/EP2007/006265 WO2008022672A1 (fr) 2006-08-21 2007-07-14 Pompe de circulation

Publications (2)

Publication Number Publication Date
EP2049800A1 EP2049800A1 (fr) 2009-04-22
EP2049800B1 true EP2049800B1 (fr) 2011-12-28

Family

ID=38577399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07786069A Not-in-force EP2049800B1 (fr) 2006-08-21 2007-07-14 Pompe de circulation

Country Status (5)

Country Link
US (1) US7802971B2 (fr)
EP (1) EP2049800B1 (fr)
JP (1) JP5209622B2 (fr)
KR (1) KR101229173B1 (fr)
WO (1) WO2008022672A1 (fr)

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DE102009046516A1 (de) * 2009-11-09 2011-05-12 Zf Lenksysteme Gmbh Verdrängerpumpe
WO2013040780A1 (fr) * 2011-09-22 2013-03-28 长沙中联重工科技发展股份有限公司 Système de commande pour pompe à déplacement variable et équipement de propulsion hydraulique
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CN111076091B (zh) * 2020-01-06 2024-09-17 广州环投环境服务有限公司 一种高扬程恒流投加装置

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US20080279699A1 (en) 2008-11-13
US7802971B2 (en) 2010-09-28
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KR20090120019A (ko) 2009-11-24
KR101229173B1 (ko) 2013-02-01
JP5209622B2 (ja) 2013-06-12
EP2049800A1 (fr) 2009-04-22

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