Integrated electro-hydraulic pump

Abstract

The utility model relates to the technical field of telex control and fluid transmission, in particular to an integrated electro-hydraulic pump, which mainly comprises a control valve island, an electro-hydraulic pump control unit, a connecting mechanism and a mounting mechanism, the connecting mechanism is arranged on the right side of the control valve island, the electro-hydraulic pump control unit comprises the connecting mechanism and the mounting mechanism, and the mounting mechanism is arranged on the right side of the control valve island. The connecting mechanism is arranged on the left side of the connecting mechanism. The high-power control motor and the multi-quadrant hydraulic pump are directly connected through the internal spline and the external spline, a coupler and a bell jar are removed, the axial distance is reduced by more than 30%, the total installed power of a single unit is more than 10 kW, the hydraulic pump is particularly suitable for being applied to occasions with medium power and high power, a coupler with large mass is removed, and the cost is reduced. The rotational inertia of the whole rotor is reduced, the response speed and the response frequency of the high-power pump control unit are improved, the transmission of the high-power control motor and the multi-quadrant hydraulic pump is more stable by adopting integral interpolation spline transmission, and the overall energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical fields of electrohydraulic control and fluid transmission, and particularly relates to an integrated electro-hydraulic pump. Background Technique

[0002] A hydraulic pump is a power element of a hydraulic system, and its function is to provide pressure oil for the hydraulic system. From the perspective of energy conversion, it converts the mechanical energy output by a prime mover (such as an engine) into the pressure energy of a liquid that is convenient for transportation. The new axial piston pump with a radial multi-plunger distribution axially symmetrically arranged not only has the characteristics of relatively compact structure, wide working speed range, and high working pressure, but also the structural design of its short-stroke plunger and cylinder barrel effectively reduces mechanical friction and the dead volume of the plunger cavity, improving the efficiency of converting mechanical energy into hydraulic energy. This pump is a multi-quadrant hydraulic pump with the ability to work in multiple quadrants and is particularly suitable for the design and optimization of integrated electro-hydraulic pumps.

[0003] However, the existing electro-hydraulic pumps face some significant limitations in design and use. Although they play an important role and have a wide application prospect in the application of most scenarios, such as industry, energy, marine engineering, construction, etc., the problems of their large volume, more occupied space, and heavy weight cannot be ignored. Traditional electro-hydraulic pumps often include components such as an electric motor, a hydraulic pump, an oil tank, and various control valves. These components are usually installed independently and require a large physical space. This design not only increases the volume of the overall system but also makes the layout and maintenance more complex. The volume and weight of the electro-hydraulic pump and its auxiliary equipment will have a significant impact on the efficiency and performance of the entire system. Moreover, the design of electro-hydraulic pumps generally combines high-performance internal gear pumps, but due to their special structural design, they cannot meet the application occasions of multiple quadrants, and at relatively high working pressures, the total efficiency drops rapidly, the flow pulsation is large, and they are not suitable for low-speed working conditions.

[0004] Therefore, an integrated electro-hydraulic pump is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide an integrated electro-hydraulic pump to solve the problem of the large volume and redundancy of the original electro-hydraulic pump's overall system proposed in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] An integrated electro-hydraulic pump, comprising: an electro-hydraulic pump control unit and its control valve island

[0008] The electro-hydraulic pump control unit is arranged on the right side of the control valve island, and the electro-hydraulic pump control unit includes a connecting mechanism and a mounting mechanism;

[0009] The connecting mechanism is arranged on the right side of the control valve island and is used for the connection inside the electro-hydraulic pump control unit. The connecting mechanism includes a high-power control motor located on the right side of the control valve island.

[0010] The installation mechanism is arranged on the left side of the connecting mechanism and is used for connecting and fixing the control valve island and the electro-hydraulic pump control unit. The installation mechanism includes an intermediate valve plate located on the left side of the high-power control motor.

[0011] Preferably, a transition connection flange is fixedly installed at the left end of the high-power control motor. The right side surface of the transition connection flange and the left side surface of the high-power control motor are sealed by a rubber sealing ring. A multi-quadrant hydraulic pump is fixedly installed on the left side surface of the transition connection flange.

[0012] Preferably, the right side surface of the multi-quadrant hydraulic pump and the left side surface of the transition connection flange are sealed by a rubber sealing ring. A pressure measuring joint is fixedly installed through the outer wall of the transition connection flange.

[0013] Preferably, an external spline is fixedly installed at the right end of the multi-quadrant hydraulic pump, and an internal spline is fixedly installed at the left end of the high-power control motor. The outer wall of the external spline is meshed and connected with the inner wall of the internal spline.

[0014] Preferably, an oil passage is opened at one end of the transmission shaft of the multi-quadrant hydraulic pump. Oil ports two and one are respectively opened on the upper and lower side surfaces of the transition connection flange. Hydraulic oil is arranged inside the oil passage.

[0015] Preferably, the intermediate valve plate is fixedly installed on the left side surface of the multi-quadrant hydraulic pump through bolt two, and the intermediate valve plate is fixedly installed on the right side of the control valve island through bolt one.

[0016] Preferably, a check valve with a filter screen is fixedly installed through the side surface of the intermediate valve plate. A positioning pin is fixedly installed on the right side surface of the control valve island. A through hole is opened on the side surface of the intermediate valve plate. The outer wall of the positioning pin is slidably connected with the inner wall of the through hole.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] In the present utility model, the high-power control motor and the multi-quadrant hydraulic pump are directly connected through the internal spline and the external spline, removing the coupling and the bell housing. The axial distance is reduced by more than 30%. The total installed power of a single unit is above 10 kW, which is particularly suitable for applications in medium- and high-power occasions. The coupling with a large mass is removed, reducing the moment of inertia of the entire rotor, improving the response speed and response frequency of the high-power pump control unit. The integral internal inserted spline drive is adopted, making the drive between the high-power control motor and the multi-quadrant hydraulic pump more stable and improving the overall energy efficiency.

[0019] An oil passage is provided at one end of the transmission shaft of the multi-quadrant hydraulic pump. When the rotor rotates, the centrifugal force generated by the spline shaft pulls the hydraulic oil in the multi-quadrant hydraulic pump housing towards the spline connection. At the same time, the leaked hydraulic oil of the pump also tends to flow from the flow channel to the spline connection between the high-power control motor and the multi-quadrant hydraulic pump, similar to the lubrication of the reducer gears, playing an active lubrication role and taking away local heat, significantly improving the service life of the entire electro-hydraulic pump control unit and almost eliminating the need for maintenance.

[0020] Through the settings of the intermediate valve plate, bolt one, and bolt two, it is beneficial to avoid designing deep and densely arranged bolt connection holes on the control valve island when the control valve island is directly connected to the electro-hydraulic pump control unit, leaving enough space for the flow channel design of the control valve island, thereby reducing the volume and mass of the control valve island, making the entire unit design more compact and reasonable. The one-way valve and the filter are combined into a one-way valve with a filter, effectively reducing the structural volume of the entire unit. Through the above structural design, the design volume and weight of the direct connection between the electro-hydraulic pump control unit and the control valve island are both reduced, and the entire control system can be more stable. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional structure schematic diagram of the present utility model;

[0022] Figure 2 is an exploded three-dimensional structure diagram of the present utility model;

[0023] Figure 3 is a three-dimensional structure schematic diagram of the electro-hydraulic pump control unit of the present utility model;

[0024] Figure 4 is an exploded three-dimensional structure diagram of the electro-hydraulic pump control unit of the present utility model;

[0025] Figure 5 is a connection structure diagram of the motor and the pump of the electro-hydraulic pump control unit of the present utility model.

[0026] In the figure:

[0027] 1. Control valve island; 101. Electro-hydraulic pump control unit;

[0028] 2. Connection mechanism; 201. High-power control motor; 202. Transition connection flange; 203. Multi-quadrant hydraulic pump; 204. Rubber sealing ring; 205. Pressure measuring joint; 206. External spline; 207. Internal spline; 208. Oil port one; 209. Oil port two; 210. Oil passage; 211. Hydraulic oil;

[0029] 3. Installation mechanism; 301. Intermediate valve plate; 302. Bolt one; 303. Bolt two; 304. One-way valve with filter; 305. Positioning pin. Detailed Description of the Embodiment

[0030] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0032] As Figures 1-5 shown, this application provides an integrated electro-hydraulic pump, including: a control valve island 1, an electro-hydraulic pump control unit 101, which is arranged on the right side of the control valve island 1, and the electro-hydraulic pump control unit 101 includes a connecting mechanism 2 and a mounting mechanism 3. The connecting mechanism 2 is arranged on the right side of the control valve island 1 and is used for the connection inside the electro-hydraulic pump control unit 101. The connecting mechanism 2 includes a high-power control motor 201 located on the right side of the control valve island 1. The mounting mechanism 3 is arranged on the left side of the connecting mechanism 2 and is used for connecting and fixing the control valve island 1 and the electro-hydraulic pump control unit 101. The mounting mechanism 3 includes an intermediate valve plate 301 located on the left side of the high-power control motor 201.

[0033] In this embodiment: Through the setting of the connecting mechanism 2, the transmission between the high-power control motor 201 and the multi-quadrant hydraulic pump 203 becomes smoother, improving the overall energy efficiency. At the same time, the hydraulic oil 211 leaked from the pump also tends to flow from the flow channel to the spline connection between the high-power control motor 201 and the multi-quadrant hydraulic pump 203, playing a role of active lubrication and taking away local heat, significantly improving the service life of the entire electro-hydraulic pump control unit 101, and almost being maintenance-free. The oil port 208 or the oil port 209 can be externally connected to an active oil supply lubrication station for active lubrication and cooling. One of the oil ports is connected to the oil return and filtration pipeline to bring the oil back to the pump control unit. Through the setting of the mounting mechanism 3, the check valve and the filter screen are combined together, effectively reducing the structural volume of the entire unit. Through the above structural design, the design volume and weight of the direct connection between the electro-hydraulic pump control unit 101 and the control valve island 1 are both reduced, and the entire control system can be more stable.

[0034] Specifically, as Figures 1-5 shown, a transition connection flange 202 is fixedly installed at the left end of the high-power control motor 201. The right side surface of the transition connection flange 202 is sealed with the left side surface of the high-power control motor 201 through a rubber sealing ring 204. The multi-quadrant hydraulic pump 203 is fixedly installed on the left side surface of the transition connection flange 202.

[0035] In this embodiment: By providing the rubber sealing ring 204, the transition connecting flange 202 and the high-power control motor 201 are sealed, and the internal hydraulic oil 211 is not likely to leak.

[0036] Specifically, as Figures 1-5 shown, the right side of the multi-quadrant hydraulic pump 203 and the left side of the transition connecting flange 202 are sealed by the rubber sealing ring 204, and a pressure measuring joint 205 is fixedly installed through the outer wall of the transition connecting flange 202.

[0037] In this embodiment: By sealing the right side of the multi-quadrant hydraulic pump 203 and the left side of the transition connecting flange 202 with the rubber sealing ring 204, the internal hydraulic oil 211 is not likely to leak. The setting of the pressure measuring joint 205 can measure the pressure.

[0038] Specifically, as Figures 1-5 shown, an external spline 206 is fixedly installed at the right end of the multi-quadrant hydraulic pump 203, and an internal spline 207 is fixedly installed at the left end of the high-power control motor 201. The outer wall of the external spline 206 is meshed and connected with the inner wall of the internal spline 207.

[0039] In this embodiment: By directly connecting the high-power control motor 201 and the multi-quadrant hydraulic pump 203 through the internal spline 207 and the external spline 206, the coupling and the bell housing are removed, the axial distance is reduced by more than 30%, the total installed power of a single unit is above 10 kW, which is particularly suitable for applications in medium- and high-power occasions. The coupling with a large mass is removed, the rotational inertia of the entire rotor is reduced, the response speed and response frequency of the high-power pump control unit are improved, and the integral internal inserted spline drive is adopted to make the transmission between the high-power control motor 201 and the multi-quadrant hydraulic pump 203 more stable, and the overall energy efficiency is improved.

[0040] Specifically, as Figures 1-5 shown, an oil passage 210 is opened at one end of the transmission shaft of the multi-quadrant hydraulic pump 203, and an oil port two 209 and an oil port one 208 are respectively opened on the upper and lower sides of the transition connecting flange 202, and the hydraulic oil 211 is arranged inside the oil passage 210.

[0041] In this embodiment: An oil passage 210 is provided at one end of the transmission shaft of the multi-quadrant hydraulic pump 203. When the rotor rotates, the centrifugal force generated by the spline shaft pulls the hydraulic oil 211 in the housing of the multi-quadrant hydraulic pump 203 towards the spline connection. At the same time, the leaked hydraulic oil 211 of the pump also tends to flow from the flow passage to the spline connection between the high-power control motor 201 and the multi-quadrant hydraulic pump 203, similar to the lubrication of the reducer gears, playing an active lubrication role and taking away local heat, significantly improving the service life of the entire electro-hydraulic pump control unit 101 and almost being maintenance-free. The first oil port 208 or the second oil port 209 can be externally connected to an active oil supply lubrication station for active lubrication and cooling, and one of the oil ports is connected to the oil return and filtration pipeline to bring the oil back to the pump control unit.

[0042] Specifically, as Figures 1-5 shown, the intermediate valve plate 301 is fixedly installed on the left side of the multi-quadrant hydraulic pump 203 through the second bolt 303, and the intermediate valve plate 301 is fixedly installed on the right side of the control valve island 1 through the first bolt 302.

[0043] In this embodiment: This structure is beneficial for avoiding the design of deep and densely arranged bolt connection holes on the control valve island 1 when the control valve island 1 is directly connected to the electro-hydraulic pump control unit 101, leaving enough space for the flow passage design of the control valve island 1, thereby reducing the volume and mass of the control valve island 1 and making the entire unit design more compact and reasonable.

[0044] Specifically, as Figures 1-5 shown, a check valve with a filter 304 is fixedly penetrated on the side of the intermediate valve plate 301, a positioning pin 305 is fixedly installed on the right side of the control valve island 1, a through hole is provided on the side of the intermediate valve plate 301, and the outer wall of the positioning pin 305 is slidably connected to the inner wall of the through hole.

[0045] In this embodiment: During installation, pre-positioning is carried out through the positioning pin 305, which is convenient for assembly and effectively avoids the misinstallation of the upper and lower oil ports. The check valve with a filter 304 is embedded on the intermediate valve plate 301. The leaked oil from the housing of the multi-quadrant hydraulic pump 203 reaches the low-pressure line of the control valve island 1 through the check valve and the filter, keeping the housing pressure of the multi-quadrant hydraulic pump 203 at a low pressure. The oil in the control valve island 1 cannot flow back into the housing of the multi-quadrant hydraulic pump 203 through the check valve. This structure eliminates the need to design an oil drain filter on the control valve island 1, and the check valve and the filter are combined together, effectively reducing the structural volume of the entire unit. Through the above structural design, the design volume and weight of the direct connection between the electro-hydraulic pump control unit 101 and the control valve island 1 are both reduced, and the entire control system can be more stable.

[0046] The specific solution of this scheme is as follows: The high-power control motor 201 and the multi-quadrant hydraulic pump 203 are directly connected through the internal spline 207 and the external spline 206, removing the coupling and the bell housing, reducing the axial distance by more than 30%. The total installed power of a single unit is above 10 kW, which is particularly suitable for medium- and high-power applications. Removing the relatively heavy coupling reduces the moment of inertia of the entire rotor, improving the response speed and response frequency of the high-power pump control unit. The use of an integral internal insert spline drive makes the transmission between the high-power control motor 201 and the multi-quadrant hydraulic pump 203 more stable, improving the overall energy efficiency. An oil passage 210 is provided at one end of the transmission shaft of the multi-quadrant hydraulic pump 203. When the rotor rotates, the centrifugal force generated by the spline shaft pulls the hydraulic oil 211 in the housing of the multi-quadrant hydraulic pump 203 towards the spline connection. At the same time, the leaked hydraulic oil 211 also tends to flow from the flow passage to the spline connection between the high-power control motor 201 and the multi-quadrant hydraulic pump 203, similar to the lubrication of the gears in a speed reducer, playing an active lubrication role and taking away local heat, significantly increasing the service life of the entire electro-hydraulic pump control unit 101 and requiring almost no maintenance. Through the setting of the intermediate valve plate 301, bolt one 302, and bolt two 303, when the control valve island 1 is directly connected to the electro-hydraulic pump control unit 101, it is beneficial to avoid designing deep and densely arranged bolt connection holes on the control valve island 1, leaving enough space for the flow passage design of the control valve island 1, thereby reducing the volume and mass of the control valve island 1 and making the entire unit design more compact and reasonable. The combination of the one-way valve and the filter is a one-way valve with a filter 304, effectively reducing the structural volume of the entire unit. Through the above structural design, the design volume and weight of the direct connection between the electro-hydraulic pump control unit 101 and the control valve island 1 are reduced, and the entire control system can be more stable.

[0047] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0048] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated electro-hydraulic pump, comprising: The control valve island (1) is characterized in that An electro-hydraulic pump control unit (101) is arranged on the right side of the control valve island (1), and the electro-hydraulic pump control unit (101) comprises a connecting mechanism (2) and a mounting mechanism (3); A connection mechanism (2) is arranged on the right side of the control valve island (1) and is used for connection inside the electro-hydraulic pump control unit (101); the connection mechanism (2) comprises a high-power control motor (201) located on the right side of the control valve island (1); The mounting mechanism (3) is arranged on the left side of the connecting mechanism (2) and is used to connect and fix the control valve island (1) to the electro-hydraulic pump control unit (101). The mounting mechanism (3) comprises an intermediate valve plate (301) located on the left side of the high-power control motor (201).

2. An integrated electro-hydraulic pump according to claim 1, characterized in that: A transition connection flange (202) is fixedly mounted on the left end of the high-power control motor (201); the right side of the transition connection flange (202) and the left side of the high-power control motor (201) are sealed via a rubber sealing ring (204); and a multi-quadrant hydraulic pump (203) is fixedly mounted on the left side of the transition connection flange (202).

3. An integrated electro-hydraulic pump according to claim 2, characterized in that: The right side surface of the multi-quadrant hydraulic pump (203) and the left side surface of the transition connection flange (202) are sealed via a rubber sealing ring (204), and a pressure measuring joint (205) is fixedly installed through the outer wall of the transition connection flange (202).

4. The integrated electro-hydraulic pump according to claim 3, characterized in that: An external spline (206) is fixedly mounted on the right end of the multi-quadrant hydraulic pump (203), and an internal spline (207) is fixedly mounted on the left end of the high-power control motor (201), wherein the outer wall of the external spline (206) is meshingly connected with the inner wall of the internal spline (207).

5. The integrated electro-hydraulic pump according to claim 4, characterized in that: An oil passage (210) is provided at one end of the transmission shaft of the multi-quadrant hydraulic pump (203), and oil port 2 (209) and oil port 1 (208) are respectively provided on the upper and lower sides of the transition connection flange (202), and hydraulic oil (211) is provided inside the oil passage (210).

6. The integrated electro-hydraulic pump according to claim 1, characterized in that: The intermediate valve plate (301) is fixedly mounted on the left side of the multi-quadrant hydraulic pump (203) by means of bolt 2 (303), and the intermediate valve plate (301) is fixedly mounted on the right side of the control valve island (1) by means of bolt 1 (302).

7. The integrated electro-hydraulic pump according to claim 6, characterized in that: A one-way valve (304) with a filter screen is fixedly passed through the side of the intermediate valve plate (301), a positioning pin (305) is fixedly installed on the right side of the control valve island (1), a through hole is opened on the side of the intermediate valve plate (301), and the outer wall of the positioning pin (305) is slidably connected to the inner wall of the through hole.

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