CN211474417U - Open hydraulic pump and open hydraulic system - Google Patents

Open hydraulic pump and open hydraulic system Download PDF

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Publication number
CN211474417U
CN211474417U CN201922243680.0U CN201922243680U CN211474417U CN 211474417 U CN211474417 U CN 211474417U CN 201922243680 U CN201922243680 U CN 201922243680U CN 211474417 U CN211474417 U CN 211474417U
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China
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oil
hydraulic pump
working chamber
sealed working
hydraulic
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CN201922243680.0U
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Inventor
何清华
方庆琯
刘昌盛
吴民旺
李赛白
戴鹏
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Sunward Intelligent Equipment Co Ltd
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Sunward Intelligent Equipment Co Ltd
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Abstract

The utility model discloses an open hydraulic pump and open hydraulic system, open hydraulic pump have sealed working chamber to and respectively with the oil outlet passageway and the first oil absorption passageway of sealed working chamber intercommunication, the oil outlet passageway is used for the oil feed chamber intercommunication with hydraulic system executive component, the first oil absorption passageway is used for the oil tank intercommunication with hydraulic system, still includes the second oil absorption passageway with sealed working chamber intercommunication, the second oil absorption passageway is used for the oil return chamber intercommunication with hydraulic system executive component. The open type hydraulic pump is used in a hydraulic system for generating medium-pressure return oil, so that the hydraulic return oil with higher pressure (such as more than 3 MPa) enters a second oil absorption channel of the hydraulic pump, and the direct recovery of the hydraulic energy of the medium-pressure return oil is realized; and the normal working condition of the open type hydraulic pump can be completed by switching to oil absorption from the normal pressure oil tank under other working conditions of zero pressure oil return.

Description

Open hydraulic pump and open hydraulic system
Technical Field
The utility model relates to a hydraulic system technical field especially relates to an open hydraulic pump and open hydraulic system.
Background
The open hydraulic pump is applied to an open hydraulic system with a plurality of hydraulic actuators. In the multiple hydraulic execution elements, the hydraulic oil return pressure of the oil return cavity of most execution elements is less than 1Mpa, and the hydraulic oil return pressure belongs to zero pressure oil return; however, the oil return cavity of at least one actuating element can generate hydraulic oil return pressure of about 10Mpa, and the hydraulic oil return pressure belongs to medium-pressure oil return. In a typical open hydraulic system, this portion of the return medium pressure oil, as well as the other return zero pressure oil, is released back into the tank. The hydraulic energy of the medium-pressure return oil is changed into heat energy which is consumed when the oil temperature rises, and hydraulic energy loss is caused.
In order to utilize the hydraulic energy returned from the medium pressure (about 10 Mpa), the following methods are currently used for recycling. One is to pass the return oil flow of the higher pressure through the hydraulic transformer and then charge the return oil flow into an accumulator for storage, and the return oil flow can be released for use when needed. And secondly, the oil return flow with higher pressure is used for driving a hydraulic motor, and the hydraulic motor is used for driving a generator to generate electricity, so that the electricity can be recycled in an electric energy mode. Thirdly, the return oil flow with higher pressure is used for driving the hydraulic motor, and then the torque and the rotating speed output by the hydraulic motor are coupled with the torque and the rotating speed of the motor for driving the hydraulic pump, so that the hydraulic motor is recycled in a mechanical energy mode. The recycling methods all involve pressure matching and rotating speed matching, the displacement of a hydraulic motor or a hydraulic transformer needs to be adjusted in real time, and a complex hydraulic control valve bank and an electric control sensing system need to be configured. In addition to the high cost and difficult adjustment, these recycling methods also have low recycling efficiency because the recycled medium-pressure return oil has more elements and complicated flow channels, which results in large pressure loss.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide one kind can be with the open hydraulic pump of the direct recycle of the oil return flow of higher pressure with hydraulic pressure energy form, still the corresponding open hydraulic system who has this open hydraulic pump that provides.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides an open hydraulic pump, has sealed working chamber to and respectively with the oil outlet channel and the first oil absorption passageway of sealed working chamber intercommunication, the oil outlet channel is used for the oil feed chamber intercommunication with hydraulic system executive component, the first oil absorption passageway is used for the oil tank intercommunication with hydraulic system, still includes the second oil absorption passageway with sealed working chamber intercommunication, the second oil absorption passageway is used for the oil return chamber intercommunication with hydraulic system executive component.
The open hydraulic pump is used in a hydraulic system for generating medium-pressure return oil, so that the hydraulic return oil with higher pressure (such as more than 3 Mpa) enters a second oil absorption channel of the hydraulic pump and is compressed by the hydraulic pump to become high-pressure oil, and direct recovery of medium-pressure return oil hydraulic energy is realized; and the normal working condition of the open type hydraulic pump can be completed by switching to oil absorption from the normal pressure oil tank under other working conditions of zero pressure oil return.
As a further improvement of the above technical solution:
the first oil suction channel and the second oil suction channel are connected with the sealed working cavity through the gating module, and the gating module is used for controlling the connection and disconnection of the first oil suction channel and the sealed working cavity and controlling the connection and disconnection of the second oil suction channel and the sealed working cavity. Thus, the oil suction window of the oil distribution mechanism of the hydraulic pump can be communicated with the first oil suction channel (at the moment, the second oil suction channel is closed) or communicated with the second oil suction channel (at the moment, the first oil suction channel is closed) according to the requirement of the hydraulic system. The optimal gating module consists of a hydraulic control one-way valve or a reversing valve which can realize on-off switching of an oil path, and the one-way valve or the reversing valve can be of a two-way cartridge valve type or a slide valve type. The one-way valve or the reversing valve can be integrally installed in an oil circuit block to form a structural module; and the oil suction device can also be respectively arranged at the proper positions of the two oil suction channels to form a functional module.
The gating module is a reversing valve, a port P of the reversing valve is communicated with the sealed working cavity, a port A of the reversing valve is communicated with the first oil suction channel, and a port B of the reversing valve is communicated with the second oil suction channel.
The gating module comprises a first one-way valve and a second one-way valve, the first oil suction channel is connected with the sealed working cavity through the first one-way valve, and the second oil suction channel is connected with the sealed working cavity through the second one-way valve.
The first oil suction channel and the second oil suction channel are both communicated with an oil suction port, and the oil outlet channel is communicated with an oil outlet. When an oil suction port arranged on the pump body is shared, the two oil suction channels can be sleeved with a pipeline (namely the second oil suction channel) with higher pressure resistance in the original oil suction cavity (namely the first oil suction channel) to form a nested double-channel structure that a large channel (0 pressure) is sleeved with a small channel (medium pressure).
The first oil suction passage is communicated with an oil suction port, and the second oil suction passage is communicated with the other oil suction port; the oil outlet channel is communicated with an oil outlet. When an oil suction port is arranged on each channel on the pump body, the original oil suction cavity can be changed into a parallel double-channel structure; the pump body can be modified, and a medium-pressure channel is added.
No matter what kind of above listed or not listed double-channel structure is adopted, all belong to the utility model discloses a configuration that has disposed double oil absorption passageway in the oil absorption district.
And an oil suction window is communicated between the gating module and the sealed working cavity.
And a pressure oil window is communicated between the oil outlet channel and the sealed working cavity.
The open type hydraulic pump is further provided with an oil discharge area and an oil seal area, and the second oil suction channel is not communicated with the oil discharge area and the oil seal area.
As a general utility model concept, the utility model discloses still provide an open hydraulic system, including oil tank, executive component to and foretell open hydraulic pump, the oil outlet passageway with executive component's oil feed chamber intercommunication, first oil absorption passageway and oil tank intercommunication, second oil absorption passageway with executive component's oil return chamber intercommunication.
Compared with the prior art, the utility model has the advantages of:
the utility model innovatively provides an open hydraulic pump, which can directly recycle the return oil flow with higher pressure in a hydraulic energy mode, and has high recycling efficiency; but also adopt this energy-conserving hydraulic system of form of directly retrieving can hardly change (only need change former open hydraulic pump for the utility model discloses an open hydraulic pump to change slightly to the oil circuit of middling pressure oil return can), with low costs, the superiority is obvious.
Drawings
Fig. 1 is a schematic structural diagram of an open hydraulic pump according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a boom hydraulic system of a conventional excavator.
Fig. 3 is a schematic diagram of the open hydraulic pump of the present invention applied to a boom hydraulic system.
Illustration of the drawings: 1. sealing the working cavity; 2. an oil outlet channel; 3. a first oil suction passage; 4. a second oil suction passage; 5. an oil suction port; 6. an oil outlet; 7. an oil suction window; 8. pressing an oil window; 9. and a gating module.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
As shown in fig. 1, the utility model discloses an open hydraulic pump contains oil absorption district (oil absorption mouth and oil absorption passageway), joins in marriage oily mechanism, variable volumetric sealed working chamber 1, presses the oil zone, and wherein the joining in marriage oily mechanism, variable volumetric sealed working chamber 1, the oil zone of pressing (high pressure goes out oil passageway 2 and oil-out 6) and current hydraulic pump of hydraulic pump are the same. The hydraulic pump may be a plunger pump or a gear pump. The utility model discloses an open hydraulic pump's characteristics are, have configured two oil absorption passageways in the oil absorption district, and first oil absorption passageway 3 is arranged in sucking the hydraulic oil that relative pressure is about 0 from the ordinary pressure oil tank, and first oil absorption passageway 3 is the same with the oil absorption passageway of current hydraulic pump, can with the oil drainage district in the pump body and the oil blanket district intercommunication of axle extension. The second oil suction passage 4 is used for sucking hydraulic oil with the relative pressure of about 10Mpa from an oil return cavity of an actuating element of a hydraulic system, and is isolated from an oil discharge area and an oil seal area of a shaft extension in a pump body. The first oil suction channel 3 and the second oil suction channel 4 of the open type hydraulic pump can share one oil suction opening 5 arranged on the pump body, and an oil suction opening can also be respectively arranged on the pump body for each channel.
When an oil suction port arranged on the pump body is shared, the two oil suction channels can be sleeved with a pipeline (namely the second oil suction channel 4) with higher pressure resistance in the original oil suction cavity (namely the first oil suction channel 3) to form a nested double-channel structure that a large channel (0 pressure) is sleeved with a small channel (medium pressure). When an oil suction port is arranged on each channel on the pump body, the original oil suction cavity can be changed into a parallel double-channel structure; the pump body can be modified, and a medium-pressure channel is added. No matter what kind of above listed or not listed double-channel structure is adopted, all belong to the utility model discloses a configuration that has disposed double oil absorption passageway in the oil absorption district.
The two oil suction channels are communicated with an oil suction window 7 of the hydraulic pump oil distribution mechanism through a gating module 9 arranged in the hydraulic pump body. The gating module 9 has a function of communicating 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 (at this time, the first oil suction passage 3 is closed) according to the requirement of the hydraulic system. The gating module 9 is composed of a hydraulic control one-way valve or a reversing valve which can realize on-off switching of an oil path, and the one-way valve or the reversing valve can be of a two-way cartridge valve type or a slide valve type. The one-way valve or the reversing valve can be integrally installed in an oil circuit block to form a structural module; and the oil suction device can also be respectively arranged at the proper positions of the two oil suction channels to form a functional module.
Example (b):
as shown in fig. 1, in the open hydraulic pump of the present embodiment, a sealed working chamber 1, a pressure oil window 8, an oil suction window 7, an oil outlet channel 2, a first oil suction channel 3, a second oil suction channel 4, an oil suction port 5, and an oil outlet 6 are formed in a pump body of the open hydraulic pump.
The oil outlet 6, the oil outlet channel 2, the oil pressing window 8 and the sealed working cavity 1 are communicated in sequence. The oil suction window 7 is communicated with the sealed working cavity 1, the first oil suction channel 3 and the second oil suction channel 4 are communicated with the oil suction window 7 through a gating module 9, the gating module 9 is a reversing valve, the reversing valve is communicated with the sealed working cavity 1, one oil way of the reversing valve is communicated with the first oil suction channel 3, and the other oil way of the reversing valve is communicated with the second oil suction channel 4. The first oil suction passage 3 and the second oil suction passage 4 are both communicated with an oil suction opening 5. The oil outlet channel 2 is communicated with an oil inlet cavity of an actuating element of the hydraulic system through an oil outlet 6, the first oil suction channel 3 is communicated with an oil tank of the hydraulic system through an oil suction opening 5, and the second oil suction channel 4 is communicated with an oil return cavity of the actuating element with medium-pressure oil return pressure in the hydraulic system through the oil suction opening 5.
In addition, open hydraulic pump still has oil drain district and oil blanket district, and second oil absorption passageway 4 all communicates with oil drain district and oil blanket district.
The following description applies the utility model discloses an example in hydraulic pressure excavator boom cylinder big chamber middling pressure oil return energy recovery:
see the conventional excavator boom principle of fig. 2. The boom cylinder 100 of the hydraulic excavator provides a main power for lifting and dropping the excavator boom. The pressure oil output by the first and second hydraulic main pumps 210 and 220 is controlled by the first and second boom operating links 310 and 320 of the multi-way valve 300 to drive the extension and retraction of the piston rod of the boom cylinder 100, and when the piston rod extends, the boom raising load is lifted; when the piston rod is retracted, the boom drop load is lowered. When the load is lifted, hydraulic pressure works on the load, so that the potential energy of the load is increased; when the load of the movable arm falls down, the increased potential energy can be changed into the pressure energy of hydraulic oil in an oil return cavity (large cavity) of the movable arm hydraulic cylinder, so that the oil return pressure of the large cavity is increased to about 10 Mpa. The large-cavity return oil is released to an oil return tank through a movable arm joint orifice of the multi-way valve 300, and the pressure energy is changed into heat energy and is wasted.
Fig. 3 is a hydraulic circuit diagram applied to the example of the utility model when recovering the return oil energy in the middle pressure of the lower cavity of the arm cylinder of the hydraulic excavator. Referring to fig. 3, when the sensor Pa7 detects that hydraulic oil on a pipeline between the multi-way valve 300 and the pilot control valve 400 is at a high pressure (greater than 3 Mpa) and the sensor Pb7 detects that hydraulic oil between the multi-way valve 300 and the pilot control valve 500 is at a pressure of 0 (less than 1 Mpa), the gate module opens the first oil suction passage 3, and the electromagnet of the selector valve 600 is de-energized. The hydraulic pump sucks oil from the oil tank 700, enters the oil suction window 7 of the oil distribution mechanism through the first oil suction channel 3, is compressed in the sealed working cavity 1 of the pump to form high-pressure oil, and is output to the multi-way valve 300 from the oil pressure window 8 of the oil distribution mechanism through the oil outlet 6. The multi-way valve second boom operation link 320 is at the left position, the high-pressure oil enters the lower cavity of the boom cylinder 100 through the multi-way valve second boom operation link 320, the boom is raised, and the oil returned from the upper cavity of the boom cylinder returns to the oil tank 700 through the multi-way valve second boom operation link 320.
When the sensor Pa7 detects that hydraulic oil on a pipeline between the multi-way valve 300 and the pilot control valve 400 is 0 pressure (less than 1 Mpa), the sensor Pb7 detects that hydraulic oil between the multi-way valve 300 and the pilot control valve 500 is high pressure (greater than 3 Mpa), and the sensor Pa7 detects that the pressure of the sensor in the lower cavity of the boom cylinder 100 is greater than 3Mpa, the gate module opens the second oil suction passage 4, and the controller 800 outputs a signal to energize the electromagnet of the reversing valve 600. The return oil in the lower cavity of the movable arm cylinder directly enters the oil suction port 5 of the hydraulic pump in this embodiment through the reversing valve 600, enters the oil suction window 7 of the oil distribution mechanism through the second oil suction passage 4, is compressed in the sealed working cavity 1 of the pump to form high-pressure oil, and is output to the multi-way valve 300 from the oil discharge port through the oil pressing window 8 of the oil distribution mechanism. The multi-way valve second boom operating link 320 is at the right position, and the high-pressure oil enters the upper chamber of the boom cylinder 100 through the multi-way valve second boom operating link 320, and the boom descends under the combined action of the load gravity. In this way, the medium-pressure return oil in the lower chamber of the boom cylinder is directly recycled by the hydraulic pump of the embodiment.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims (10)

1. The utility model provides an open hydraulic pump, open hydraulic pump has sealed working chamber (1) to and respectively with oil outlet channel (2) and first oil absorption passageway (3) of sealed working chamber (1) intercommunication, oil outlet channel (2) are used for the oil feed chamber intercommunication with hydraulic system executive component, first oil absorption passageway (3) are used for the oil tank intercommunication with hydraulic system, its characterized in that still includes second oil absorption passageway (4) with sealed working chamber (1) intercommunication, second oil absorption passageway (4) are used for the oil return chamber intercommunication with hydraulic system executive component.
2. The open type hydraulic pump according to claim 1, characterized in that the first oil suction passage (3) and the second oil suction passage (4) are connected with the sealed working chamber (1) through a gating module (9), and the gating module (9) is used for controlling the connection and disconnection of the first oil suction passage (3) and the sealed working chamber (1) and controlling the connection and disconnection of the second oil suction passage (4) and the sealed working chamber (1).
3. An open hydraulic pump according to claim 2, characterized in that the gate module (9) is a directional control valve, which communicates with the sealed working chamber (1), and one oil path of which communicates with the first oil suction passage (3) and the other oil path of which communicates with the second oil suction passage (4).
4. The open hydraulic pump according to claim 2, characterized in that the gating module (9) comprises a first one-way valve and a second one-way valve, the first suction channel (3) being connected to the sealed working chamber (1) via the first one-way valve, the second suction channel (4) being connected to the sealed working chamber (1) via the second one-way valve.
5. The open hydraulic pump according to any one of claims 1 to 4, characterized in that the first suction channel (3) communicates with a suction port and the second suction channel (4) communicates with another suction port; the oil outlet channel (2) is communicated with an oil outlet.
6. The open hydraulic pump according to any one of claims 1 to 4, characterized in that the first oil suction passage (3) and the second oil suction passage (4) are both in communication with an oil suction port (5), and the oil outlet passage (2) is in communication with an oil outlet port (6).
7. The open hydraulic pump according to any one of claims 2 to 4, characterized in that it has an oil distribution mechanism having an oil suction window (7) and an oil pressure window (8), the gating module and the sealed working chamber (1) being in communication through the oil suction window (7).
8. The open hydraulic pump according to claim 7, characterized in that the oil outlet channel (2) and the sealed working chamber (1) communicate through the oil pressing window (8).
9. An open hydraulic pump according to any one of claims 1 to 4, further having an oil discharge area and an oil seal area, the second oil suction passage (4) being not in communication with both the oil discharge area and the oil seal area.
10. An open hydraulic system, characterized by comprising an oil tank, an actuator, and an open hydraulic pump according to any one of claims 1 to 9, wherein the oil outlet passage (2) communicates with an oil inlet chamber of the actuator, the first oil suction passage (3) communicates with the oil tank, and the second oil suction passage (4) communicates with an oil return chamber of the actuator.
CN201922243680.0U 2019-12-13 2019-12-13 Open hydraulic pump and open hydraulic system Active CN211474417U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922243680.0U CN211474417U (en) 2019-12-13 2019-12-13 Open hydraulic pump and open hydraulic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922243680.0U CN211474417U (en) 2019-12-13 2019-12-13 Open hydraulic pump and open hydraulic system

Publications (1)

Publication Number Publication Date
CN211474417U true CN211474417U (en) 2020-09-11

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Application Number Title Priority Date Filing Date
CN201922243680.0U Active CN211474417U (en) 2019-12-13 2019-12-13 Open hydraulic pump and open hydraulic system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021114668A1 (en) * 2019-12-13 2021-06-17 山河智能装备股份有限公司 Open hydraulic pump and open hydraulic system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021114668A1 (en) * 2019-12-13 2021-06-17 山河智能装备股份有限公司 Open hydraulic pump and open hydraulic system

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