WO2021114668A1 - Pompe hydraulique ouverte et système hydraulique ouvert - Google Patents

Pompe hydraulique ouverte et système hydraulique ouvert Download PDF

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Publication number
WO2021114668A1
WO2021114668A1 PCT/CN2020/103553 CN2020103553W WO2021114668A1 WO 2021114668 A1 WO2021114668 A1 WO 2021114668A1 CN 2020103553 W CN2020103553 W CN 2020103553W WO 2021114668 A1 WO2021114668 A1 WO 2021114668A1
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WO
WIPO (PCT)
Prior art keywords
oil
oil suction
hydraulic pump
open hydraulic
working chamber
Prior art date
Application number
PCT/CN2020/103553
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English (en)
Chinese (zh)
Inventor
何清华
方庆琯
刘昌盛
吴民旺
李赛白
戴鹏
Original Assignee
山河智能装备股份有限公司
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 CN201911281739.3A external-priority patent/CN112983805A/zh
Priority claimed from CN201911281087.3A external-priority patent/CN112983909B/zh
Application filed by 山河智能装备股份有限公司 filed Critical 山河智能装备股份有限公司
Publication of WO2021114668A1 publication Critical patent/WO2021114668A1/fr

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    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps

Definitions

  • the invention relates to the technical field of hydraulic systems, in particular to an open hydraulic pump and an open hydraulic system.
  • the open hydraulic pump is applied to an open hydraulic system with multiple hydraulic actuators.
  • the hydraulic return pressure of the return cavity of most of the actuators is less than 1MPA, which is a zero-pressure return; but at least one of the actuators’ return cavity will produce a hydraulic return pressure of about 10MPA, Medium pressure oil return.
  • this part of the medium pressure oil return is released back to the normal pressure oil tank like other zero pressure oil returns.
  • the hydraulic energy of the medium-pressure oil return becomes heat energy and is consumed by the increase in oil temperature, resulting in the loss of hydraulic energy.
  • the following methods are currently used for recycling.
  • One is to charge this part of the higher pressure return oil flow through the hydraulic transformer and then charge it into the accumulator for storage, and release it for use when needed.
  • the second is to use the higher-pressure return oil flow to drive the hydraulic motor, and then use the hydraulic motor to drive the generator to generate electricity, which is recycled in the form of electrical energy.
  • the third is to use the higher-pressure return oil flow to drive the hydraulic motor, and then couple the torque and speed of the hydraulic motor with the torque and speed of the motor that drives the hydraulic pump, and recycle it in the form of mechanical energy.
  • the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, and provide an open hydraulic pump that can directly recycle the return oil flow of higher pressure in the form of hydraulic energy, and accordingly provide an open hydraulic pump with the open hydraulic The open hydraulic system of the pump.
  • the present invention adopts the following technical solutions:
  • An open-type hydraulic pump has a sealed working cavity, an oil outlet channel and a first oil suction channel respectively communicating with the sealed working cavity, the oil outlet channel being used to communicate with the oil inlet cavity of an actuator of a hydraulic system, the first An oil suction passage is used to communicate with the oil tank of the hydraulic system, and further includes a second oil suction passage communicating with the sealed working chamber, and the second oil suction passage is used to communicate with the oil return cavity of the hydraulic system actuator.
  • the open hydraulic pump is used in a hydraulic system that generates medium-pressure oil return, so that the higher pressure (such as greater than 3MPA) hydraulic return oil enters the second suction channel of the hydraulic pump, and becomes high-pressure oil after being compressed by the hydraulic pump. So as to realize the direct recovery of the hydraulic energy of the medium pressure oil return; in other working conditions of zero pressure oil return, it can be switched to suck oil from the normal pressure oil tank to complete the conventional operating conditions of the open hydraulic pump.
  • medium-pressure oil return such as greater than 3MPA
  • the first oil suction passage and the second oil suction passage are both connected to the sealing working chamber through a gating module, and the gating module is used to control the on-off of the first oil suction passage and the sealing working chamber, and to control the second oil suction passage and the seal On-off of the working chamber.
  • the oil suction window of the oil distribution mechanism of the hydraulic pump can be connected to the first oil suction passage (at this time, the second oil suction passage is closed) or with the second oil suction passage (at this time, the first oil suction channel is connected).
  • the channel is closed).
  • the gate module is composed of a hydraulically controlled check valve or a reversing valve that can switch the oil circuit on and off.
  • the check valve or the reversing valve can be a two-way cartridge valve type or a spool valve type.
  • the one-way valve or the reversing valve can be integrated and installed in an oil circuit block to form a structural module; it can also be installed in the appropriate positions of the two oil suction channels to form a functional module.
  • the gate module is a reversing valve, the port P of the reversing valve is in communication with the sealed working chamber, the port A of the reversing valve is in communication with the first oil suction channel, and the port B of the reversing valve is connected to the second The oil suction channel is connected.
  • the gating module includes a first one-way valve and a second one-way valve.
  • the first oil suction passage is connected to the sealing working chamber through the first one-way valve
  • the second oil suction passage is connected to the sealing work chamber through the second one-way valve.
  • the working chambers are connected.
  • the first oil suction passage and the second oil suction passage are both connected with an oil suction port, and the oil outlet passage is connected with an oil outlet.
  • the two oil suction passages can be fitted with a higher pressure-resistant pipe (that is, the second oil suction passage) in the original suction cavity (that is, the first oil suction passage),
  • a nested double-channel structure is formed with a large channel (0 pressure) and a small channel (medium pressure).
  • the first oil suction channel is communicated with an oil suction port
  • the second oil suction channel is communicated with another oil suction port
  • the oil outlet channel is communicated with an oil outlet.
  • An oil suction window is communicated between the gate module and the sealed working chamber.
  • An oil pressure window is communicated between the oil outlet channel and the sealed working chamber.
  • the open hydraulic pump also has an oil drain area and an oil seal area, and the second oil suction passage is not connected with the oil drain area and the oil seal area.
  • the present invention also provides an open hydraulic system, including an oil tank, an actuator, and the above-mentioned open hydraulic pump.
  • the oil outlet channel is in communication with the oil inlet cavity of the actuator.
  • the first oil suction passage is in communication with the oil tank, and the second oil suction passage is in communication with the oil return cavity of the actuator.
  • a boom hydraulic system comprising an oil tank, a hydraulic pump, a boom cylinder, a multi-way valve and a reversing valve.
  • the hydraulic pump has a sealed working chamber, and an oil outlet channel and a first oil suction channel respectively communicating with the sealed working chamber And the second oil suction passage;
  • the oil outlet passage is connected with the oil inlet cavity of the multi-way valve,
  • the first oil suction passage is connected with the oil tank, and the second oil suction passage passes through one of the oil passages of the reversing valve and the boom cylinder.
  • the rod cavity is connected.
  • the multi-way valve is provided with a first boom linkage and a second boom linkage.
  • the working oil port of the first boom linkage is connected to the rodless chamber of the boom cylinder through another oil path of the reversing valve. Connected, the working oil port of the second boom link is in communication with the rod cavity of the boom cylinder.
  • the reversing valve makes the second oil suction channel open, and the return oil from the lower chamber of the boom cylinder (the rodless chamber) directly enters the sealing work of the hydraulic pump through the reversing valve After the pump seal working cavity is compressed, it becomes high-pressure oil, which is output to the multi-way valve through the oil outlet channel.
  • the high-pressure oil enters the rod cavity of the boom cylinder through the operation of the second boom of the multi-way valve, and under the combined action of the load gravity, the boom is lowered.
  • the medium-pressure return oil in the lower cavity of the boom cylinder is directly recycled by the hydraulic pump, and the recovery efficiency is high; and the energy-saving hydraulic system adopting the direct recovery form can hardly modify the original hydraulic system (only the original open hydraulic The pump is replaced with the open hydraulic pump of the present invention, and the oil circuit of the medium pressure oil return can be slightly modified), the cost is low, and the superiority is obvious.
  • the system In order to detect the pressure in the rod chamber and the rodless chamber of the boom, the system also includes a pilot oil source, and a first pilot control valve and a second pilot control valve respectively communicating with the pilot oil source.
  • the first pilot control valve and the second pilot control valve The control oil port of a boom linkage is connected, the pipeline connecting the first pilot control valve and the first boom is provided with a first pressure sensor, and the second pilot control valve is connected to the control oil of the second boom.
  • the pipeline connecting the second pilot control valve and the second boom is provided with a second pressure sensor.
  • a third pressure sensor is provided on the pipeline connecting the rod cavity of the second boom linkage and the boom cylinder, and a fourth pressure sensor is provided on the pipeline connecting the reversing valve and the rodless cavity of the boom cylinder.
  • control end of the reversing valve is electrically connected with a controller.
  • the present invention innovatively proposes an open hydraulic pump, which can directly recover the return oil flow of higher pressure in the form of hydraulic energy, with high recovery efficiency; and the energy-saving hydraulic system adopting the direct recovery form can almost be compared to the original hydraulic system. No modification (just replace the original open hydraulic pump with the open hydraulic pump of the present invention, and slightly change the oil circuit of the medium pressure oil return), the cost is low, and the superiority is obvious.
  • Fig. 1 is a structural principle diagram of an open hydraulic pump according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of a conventional excavating boom hydraulic system.
  • Fig. 3 is a schematic diagram of applying the open hydraulic pump of the present invention to a boom hydraulic system.
  • the open hydraulic pump of the present invention includes an oil suction area (suction port and oil suction channel), an oil distribution mechanism, a variable volume sealed working chamber 1, an oil pressure area, and the oil distribution mechanism of the open hydraulic pump , Variable-volume sealed working chamber 1, oil pressure area (high-pressure oil outlet channel 2 and oil outlet 6) is the same as the existing open hydraulic pump.
  • the open hydraulic pump can be a plunger pump and a gear pump.
  • the feature of the open hydraulic pump of the present invention is that a double suction channel is arranged in the suction area.
  • the first suction channel 3 is used to suck hydraulic oil with a relative pressure of about 0 from the normal pressure tank.
  • the first suction channel 3 is similar to the existing one.
  • the oil suction channel of the hydraulic pump can be connected with the oil drain area in the pump body and the oil seal area of the shaft extension.
  • the second oil suction channel 4 is used to suck hydraulic oil with a relative pressure of about 10 MPA from the oil return cavity of the hydraulic system actuator, and the channel is isolated from the oil drain area in the pump body and the oil seal area of the shaft extension.
  • the first oil suction passage 3 and the second oil suction passage 4 of the open-type hydraulic pump may share an oil suction port 5 provided on the pump body, or an oil suction port may be provided for each channel on the pump body.
  • the two oil suction passages can be fitted with a higher pressure-resistant pipe (that is, the second oil suction passage 4) in the original suction cavity (that is, the first suction passage 3). ), forming a nested double-channel structure with a large channel (0 pressure) and a small channel (medium pressure).
  • the original oil suction cavity can be modified into a parallel double channel structure; the pump body can also be modified to add a medium pressure channel.
  • the two oil suction passages are both communicated with the oil suction window 7 of the oil distribution mechanism of the hydraulic pump through the gating module 9 arranged in the hydraulic pump body.
  • the function of the strobe module 9 is to connect the oil suction window 7 of the oil distribution mechanism of the hydraulic pump with the first oil suction passage 3 (at this time, the second oil suction passage 4 is closed) or with the second oil suction passage 4 according to the requirements of the hydraulic system. Connected (at this time, the first oil suction channel 3 is closed).
  • the gating module 9 is composed of a hydraulically controlled one-way valve or a reversing valve that can switch the oil circuit on and off.
  • the one-way valve or the reversing valve can be a two-way cartridge valve type or a spool valve type.
  • the one-way valve or the reversing valve can be integratedly installed in an oil circuit block to form a structural module; or can be respectively installed in appropriate positions of the two oil suction channels to form a functional module.
  • the open hydraulic pump of this embodiment has a sealed working chamber 1, an oil pressure window 8, an oil suction window 7, an oil outlet channel 2, and a first oil suction channel 3 in the pump body of the open hydraulic pump. ,
  • the oil outlet 6, the oil outlet 2, the oil pressure window 8 and the sealed working chamber 1 are connected in sequence.
  • the oil suction window 7 is in communication with the sealed working chamber 1, and the first oil suction passage 3 and the second oil suction passage 4 are both connected with the oil suction window 7 through a gate module 9, wherein the gate module 9 is a reversing valve, and the reversing valve is connected to the seal
  • the working chamber 1 is in communication, an oil passage of the reversing valve is in communication with the first oil suction passage 3, and the other oil passage of the reversing valve is in communication with the second oil suction passage 4. Both the first oil suction passage 3 and the second oil suction passage 4 communicate with the oil suction port 5.
  • the oil outlet passage 2 communicates with the oil inlet cavity of the hydraulic system actuator through the oil outlet 6, the first oil suction passage 3 communicates with the oil tank of the hydraulic system through the oil suction port 5, and the second oil suction passage 4 communicates with the hydraulic system through the oil suction port 5.
  • the oil return cavity of the medium pressure oil return pressure actuator is connected.
  • the open hydraulic pump also has an oil drain area and an oil seal area, and the second oil suction passage 4 is not connected to the oil drain area and the oil seal area.
  • the boom cylinder 100 of the hydraulic excavator provides the main power for lifting and lowering the excavating boom.
  • the hydraulic pressure oil output by the first main pump 210 and the second main pump 220 is controlled by the first boom operating link 310 and the second boom operating link 320 of the multi-way valve 300 to drive the extension of the piston rod of the boom cylinder 100
  • the piston rod When the piston rod is extended, the boom is raised and the load is lifted; when the piston rod is retracted, the boom is dropped and the load is lowered.
  • Fig. 3 is a diagram of a hydraulic circuit used in an example of the present invention when the energy of the medium pressure return oil is recovered in the lower cavity of the hydraulic excavating boom cylinder.
  • the sensor PA7 detects that the hydraulic oil on the pipeline between the multi-way valve 300 and the first pilot control valve 400 is high pressure (greater than 3MPA) and the sensor PB7 detects that the multi-way valve 300 and the second pilot control valve 500 are
  • the strobe module opens the first oil suction channel 3
  • the electromagnet of the reversing valve 600 is de-energized.
  • the hydraulic pump sucks oil from the oil tank 700 and enters the oil distribution mechanism suction window 7 through the first oil suction channel 3.
  • the pump seal working chamber 1 After the pump seal working chamber 1 is compressed, it becomes high-pressure oil, which is output from the oil distribution mechanism pressure oil window 8 through the oil outlet 6 Multi-way valve 300.
  • the multi-way valve second boom operating link 320 is now in the left position, and high-pressure oil enters the lower chamber of the boom cylinder 100 through the multi-way valve second boom operating link 320 to raise the boom, and the upper chamber of the boom cylinder returns oil
  • the second boom operating link 320 via the multi-way valve flows back to the oil tank 700.
  • the strobe module opens the second oil suction channel 4, and the controller 800 outputs a signal to energize the electromagnet of the reversing valve 600.
  • the return oil from the lower chamber of the boom cylinder directly enters the suction port 5 of the hydraulic pump of this embodiment through the reversing valve 600, and enters the oil distribution mechanism suction window 7 through the second oil suction channel 4.
  • the pump seal working chamber 1 After the pump seal working chamber 1 is compressed, it becomes a high pressure
  • the oil is output from the oil distribution mechanism pressure oil window 8 to the multi-way valve 300 through the oil outlet.
  • the multi-way valve second boom operating link 320 is now in the right position, and the high-pressure oil enters the upper cavity of the boom cylinder 100 through the multi-way valve second boom operating link 320, and under the combined action of the load gravity, the boom is lowered . In this way, the medium pressure return oil in the lower chamber of the boom cylinder is directly recycled by the hydraulic pump of this embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne une pompe hydraulique ouverte et un système hydraulique ouvert ; la pompe hydraulique ouverte a une chambre de travail étanche (1), un passage de sortie d'huile (2) et un premier passage d'aspiration d'huile (3), qui sont tous deux en communication avec la chambre de travail étanche (1) ; le passage de sortie d'huile (2) est utilisé pour communiquer avec une chambre d'admission d'huile d'un élément d'actionnement du système hydraulique ; le premier passage d'aspiration d'huile (3) est utilisé pour communiquer avec un réservoir d'huile du système hydraulique et comprend également un second passage d'aspiration d'huile (4) en communication avec la chambre de travail étanche (1) ; le second passage d'aspiration d'huile (4) est utilisé pour communiquer avec une chambre de retour d'huile de l'élément d'actionnement du système hydraulique. La pompe hydraulique ouverte est utilisée dans un système hydraulique qui produit un retour d'huile à moyenne pression, ce qui force l'huile de retour hydraulique qui se trouve à une pression plus élevée à entrer dans le second passage d'aspiration de la pompe hydraulique et à réaliser la récupération directe de l'énergie hydraulique à partir du retour d'huile à moyenne pression ; l'invention peut également être utilisée dans d'autres conditions de retour d'huile à pression nulle, en passant à l'aspiration d'huile à partir du réservoir d'huile à pression atmosphérique et en créant ainsi des conditions de fonctionnement normales pour une pompe hydraulique ouverte.
PCT/CN2020/103553 2019-12-13 2020-07-22 Pompe hydraulique ouverte et système hydraulique ouvert WO2021114668A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201911281739.3 2019-12-13
CN201911281087.3 2019-12-13
CN201911281739.3A CN112983805A (zh) 2019-12-13 2019-12-13 一种开式液压泵及开式液压系统
CN201911281087.3A CN112983909B (zh) 2019-12-13 2019-12-13 一种动臂液压系统

Publications (1)

Publication Number Publication Date
WO2021114668A1 true WO2021114668A1 (fr) 2021-06-17

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PCT/CN2020/103553 WO2021114668A1 (fr) 2019-12-13 2020-07-22 Pompe hydraulique ouverte et système hydraulique ouvert

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113864269A (zh) * 2021-09-22 2021-12-31 中车太原机车车辆有限公司 一种液压系统油路转换装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868821A (en) * 1974-03-20 1975-03-04 Tyrone Hydraulics Automatic pump control system
US6752600B2 (en) * 2002-04-19 2004-06-22 Wayne Engineering Corporation Fluid system
CN103249950A (zh) * 2010-10-15 2013-08-14 伊顿公司 用于工业过程的混合液压系统
CN205331089U (zh) * 2015-12-30 2016-06-22 提坦科技（上海）有限公司 一种飞机牵引车双路液压驱动系统
CN106068389A (zh) * 2014-03-20 2016-11-02 丹佛斯动力系统公司 用于负载感应泵的电子转矩及压力控制
CN106460879A (zh) * 2014-06-02 2017-02-22 洋马株式会社 液压装置
CN108138951A (zh) * 2015-09-29 2018-06-08 凯斯纽荷兰(中国)管理有限公司 用于在cvt车辆上使用的液压回路
CN211474417U (zh) * 2019-12-13 2020-09-11 山河智能装备股份有限公司 一种开式液压泵及开式液压系统

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868821A (en) * 1974-03-20 1975-03-04 Tyrone Hydraulics Automatic pump control system
US6752600B2 (en) * 2002-04-19 2004-06-22 Wayne Engineering Corporation Fluid system
CN103249950A (zh) * 2010-10-15 2013-08-14 伊顿公司 用于工业过程的混合液压系统
CN106068389A (zh) * 2014-03-20 2016-11-02 丹佛斯动力系统公司 用于负载感应泵的电子转矩及压力控制
CN106460879A (zh) * 2014-06-02 2017-02-22 洋马株式会社 液压装置
CN108138951A (zh) * 2015-09-29 2018-06-08 凯斯纽荷兰(中国)管理有限公司 用于在cvt车辆上使用的液压回路
CN205331089U (zh) * 2015-12-30 2016-06-22 提坦科技（上海）有限公司 一种飞机牵引车双路液压驱动系统
CN211474417U (zh) * 2019-12-13 2020-09-11 山河智能装备股份有限公司 一种开式液压泵及开式液压系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113864269A (zh) * 2021-09-22 2021-12-31 中车太原机车车辆有限公司 一种液压系统油路转换装置
CN113864269B (zh) * 2021-09-22 2023-09-08 中车太原机车车辆有限公司 一种液压系统油路转换装置

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