A bidirectional hydraulic device

Abstract

The present application relates to a bidirectional hydraulic device, comprising a motor assembly, an oil pump and an oil cylinder assembly. The oil pump comprises a first delivery port and a second delivery port for delivering fluid, and is configured to be able to pump the fluid from the first delivery port to the second delivery port or from the second delivery port to the first delivery port under the driving of the motor assembly. The oil cylinder assembly is used to connect the oil pump. The oil cylinder assembly comprises a main body and a control valve in communication with the first delivery port and the second delivery port in the main body. The control valve is configured to be able to close the first delivery port and the second delivery port when the motor assembly stops driving the oil pump.

Description

Technical Field

[0001] This invention relates to the field of oil drilling tools, and more specifically to a bidirectional hydraulic device. Background Technology

[0002] As a core tool for downhole RFID-controlled circulating plugging subs, the bidirectional hydraulic system currently achieves its bidirectional function primarily through two methods. One method uses two sets of solenoid valves for control, controlling the on / off state of these valves to achieve bidirectional functionality. The other method utilizes the hydraulic differential generated by the mud pump to drive the piston, thus achieving bidirectional functionality through a mechanical structure.

[0003] However, both of the above methods have certain limitations. For example, the cost of solenoid valves is too high, and solenoid valves are easily damaged in the high temperature and high vibration environment downhole. Also, the stability of downhole mud pressure is poor, which has a significant impact on the bidirectional hydraulic device, and the bidirectional hydraulic device cannot achieve locking in place. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the present invention provides a bidirectional hydraulic device that can realize bidirectional action of the hydraulic system through a motor and can achieve locking in place. It has a simple structure and high reliability.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide a bidirectional hydraulic device, comprising,

[0006] Motor assembly;

[0007] An oil pump, comprising a first inlet and a second inlet for conveying fluid, the oil pump being configured to pump the fluid from the first inlet to the second inlet, or from the second inlet to the first inlet, under the drive of the motor assembly; and

[0008] A hydraulic cylinder assembly for connecting the hydraulic pump, the hydraulic cylinder assembly including a body and a control valve communicating with the first and second delivery ports within the body.

[0009] The control valve is configured to close the first and second delivery ports when the motor assembly stops driving the oil pump.

[0010] Furthermore, the main body is provided with a first nozzle and a second nozzle that communicate with the control valve. The control valve is configured to allow fluid to flow from the second nozzle to the second delivery port when the fluid flows from the first delivery port to the first nozzle.

[0011] Furthermore, the control valve includes a valve seat, a first valve core within the valve seat for communicating with the first delivery port and the first nozzle, and a second valve core within the valve seat for communicating with the second delivery port and the second nozzle.

[0012] The second valve core is configured to allow fluid to flow from the second nozzle to the second delivery port when the fluid flows from the first delivery port through the first valve core to the first nozzle.

[0013] Furthermore, a piston is disposed between the first valve core and the second valve core. The piston is configured to move toward the second valve core as the fluid flows from the first delivery port through the first valve core to the first nozzle, so that the second valve core connects the second nozzle and the second delivery port.

[0014] Furthermore, the piston is configured to cause the first valve core to disconnect the connection between the first nozzle and the first delivery port when the motor assembly stops driving the oil pump, and to cause the second valve core to disconnect the connection between the second nozzle and the second delivery port.

[0015] Furthermore, the valve seat is provided with a first connecting hole and a second connecting hole. The first connecting hole connects the first valve core and the first delivery port through a first flow channel provided on the main body, and the second connecting hole connects the second valve core and the second delivery port through a second flow channel provided on the main body.

[0016] Furthermore, the main body is also provided with a third flow channel connecting the second end of the control valve and the second oil nozzle, so that the second oil nozzle can be connected to the second delivery port through the second valve core.

[0017] Furthermore, the oil pump is provided with a connecting part for arranging the first delivery port and the second delivery port. The connecting part is configured to connect to the main body and to connect the first delivery port and the second delivery port to the first flow channel and the second flow channel, respectively.

[0018] Furthermore, the motor assembly includes a motor, the output shaft of which is connected to the pump shaft of the oil pump to drive the pump shaft of the oil pump to rotate forward or in reverse, thereby pumping the fluid from the first delivery port to the second delivery port, or pumping the fluid from the second delivery port to the first delivery port.

[0019] Furthermore, a connecting component is provided between the motor assembly and the oil pump for connecting the output shaft and the pump shaft.

[0020] Furthermore, the connecting assembly includes a connector for connecting the motor and the oil pump, and a coupling disposed inside the connector for connecting the output shaft and the pump shaft.

[0021] The beneficial effects of this invention are as follows: This invention provides a bidirectional hydraulic device, including a motor assembly, an oil pump, and a cylinder assembly. The oil pump includes a first delivery port and a second delivery port for conveying fluid. The oil pump is configured to pump the fluid from the first delivery port to the second delivery port, or from the second delivery port to the first delivery port, under the drive of the motor assembly. The cylinder assembly is used to connect the oil pump. The cylinder assembly includes a body and a control valve communicating with the first and second delivery ports within the body. The control valve is configured to close the first and second delivery ports when the motor assembly stops driving the oil pump. The bidirectional hydraulic device achieves bidirectional operation by switching the direction of the output rotation of the motor in the motor assembly, and achieves locking in place in conjunction with the cylinder assembly when the motor stops running. This allows for effective control of the bidirectional hydraulic device by controlling the motor, effectively improving the reliability of the bidirectional hydraulic device and reducing structural complexity. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 The diagram shown is a structural schematic of a bidirectional hydraulic device.

[0024] Figure 2 As shown Figure 1 The diagram shows a cross-sectional view of the motor assembly of the bidirectional hydraulic device.

[0025] Figure 3 As shown Figure 1 A schematic diagram of the oil pump in the bidirectional hydraulic device shown (part of the structure is shown in cross-section).

[0026] Figure 4 As shown Figure 1 The diagram shows a cross-sectional view of the connecting components of the bidirectional hydraulic device.

[0027] Figure 5 As shown Figure 1 The diagram shows a cross-sectional view of the cylinder assembly of the bidirectional hydraulic device from one perspective.

[0028] Figure 6 As shown Figure 1 The cylinder assembly of the bidirectional hydraulic device shown is viewed from another perspective.

[0029] In the figure, the following labels are used: 100, bidirectional hydraulic device; 10, motor assembly; 11, motor; 111, output shaft; 12, tailstock; 121, wire guide hole;

[0030] 20. Oil pump; 21. Pump shaft; 22. First delivery port; 23. Second delivery port; 24. Connecting part; 241. Sealing ring; 25. Connecting assembly; 251. Connecting piece; 252. Coupling; 253. Bearing; 254. Retaining ring;

[0031] 30. Hydraulic cylinder assembly; 31. Main body; 311. Connecting hole; 312. First flow channel; 313. Second flow channel; 314. Third flow channel; 32. First nozzle; 33. Second nozzle; 34. Control valve; 341. Valve seat; 3411. First end; 3412. Second end; 3413. First connecting hole; 3414. Second connecting hole; 342. First valve core; 343. Second valve core; 344. Piston; 35. Filter element. Detailed Implementation

[0032] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic structure of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] refer to Figure 1 As shown, the present invention provides a bidirectional hydraulic device 100 including a motor assembly 10, an oil pump 20 connected to the motor assembly 10, and an actuating cylinder (not shown) connected to the oil pump 20. The actuating cylinder can convert the hydraulic energy output by the oil pump 20 into mechanical energy to perform specific mechanical actions, such as linear reciprocating motion or reciprocating oscillation. The actuating cylinder is well known to those skilled in the art, and will not be described in detail in this application.

[0034] Preferably, the oil pump 20 is a bidirectional pump. The pumping direction of the oil pump 20 can be changed by the motor assembly 10 to achieve bidirectional drive of the actuating cylinder.

[0035] More preferably, a cylinder assembly 30 is further provided between the oil pump 20 and the actuating cylinder. The cylinder assembly 30 is configured to cut off the connection between the oil pump 20 and the actuating cylinder when the oil pump 20 stops pumping, thereby achieving the function of locking in place.

[0036] refer to Figure 2As shown, in some embodiments, the motor assembly 10 includes a motor 11 and a tailstock 12 disposed on the motor 11. Specifically, the tailstock 12 is mounted at the end away from the output shaft 111 of the motor 11. The tailstock 12 is provided with a wire hole 121 for electrically connecting the power cable and / or data cable of the motor 11 to pass through. In this embodiment, the tailstock 12 is connected to the motor 11 by screws. In other embodiments, the tailstock 12 can also be connected to the motor 11 by means of threaded connection, welding, snap-fit, etc.

[0037] Preferably, the motor 11 is electrically connected to a controller (not shown) on the well via a power line and / or data line. A technician can control the start, stop, and operation of the motor 11 through the controller to control the speed, direction, and angle of rotation of the output shaft 111 of the motor 11.

[0038] refer to Figure 3 As shown, in some embodiments, the oil pump 20 includes a pump shaft 21 connected to the output shaft 111, and a first delivery port 22 and a second delivery port 23 for conveying fluid. Since the oil pump 20 is a bidirectional pump, the rotation direction of the pump shaft 21 can be adjusted by changing the rotation direction of the output shaft 111 of the motor 11, thereby adjusting the pumping direction of the oil pump 20. In some embodiments, the oil pump 20 can be a bidirectional vane pump or a bidirectional gear pump. The structure of the oil pump 20 for pumping fluid is well known to those skilled in the art and will not be described in detail in this application.

[0039] In some embodiments, when the output shaft 111 of the motor 11 rotates in the forward direction, the first delivery port 22 of the oil pump 20 delivers fluid outward, while the second delivery port 23 delivers fluid into the oil pump 20. The oil pump 20 pumps the fluid input from the second delivery port 23 to the first delivery port 22. When the output shaft 111 of the motor 11 rotates in the reverse direction, the first delivery port 22 of the oil pump 20 delivers fluid into the oil pump 20, while the second delivery port 23 delivers fluid outward. The oil pump 20 pumps the fluid input from the first delivery port 22 to the second delivery port 23. It is readily understood that the forward direction can be clockwise, and the reverse direction can be counterclockwise.

[0040] In this embodiment, the oil pump 20 is further provided with a connecting portion 24 for connecting the cylinder assembly 30. A first delivery port 22 and a second delivery port 23 are both provided on the connecting portion 24 so that the first delivery port 22 and the second delivery port 23 communicate with the flow channel within the cylinder assembly 30 when the oil pump 20 is connected to the cylinder assembly 30 through the connecting portion 24. Specifically, the first delivery port 22 is located on the side wall of the connecting portion 24, and the second delivery port 23 is located at the end of the connecting portion 24. A plurality of sealing rings 241 are also provided on the connecting portion 24 to enhance the sealing performance when the oil pump 20 and the cylinder assembly 30 are connected, preventing fluid leakage between the oil pump 20 and the cylinder assembly 30. Preferably, the sealing rings 241 are provided on the portion of the connecting portion 24 between the first delivery port 22 and the second delivery port 23 to prevent fluid from flowing directly between the first delivery port 22 and the second delivery port 23.

[0041] refer to Figure 1 and Figure 4 As shown, in some preferred embodiments, a connecting assembly 25 is further provided between the motor assembly 10 and the oil pump 20 for connecting the motor 11 and the oil pump 20. The connecting assembly 25 includes a connector 251 and a coupling 252 disposed within the connector 251. The connector 251 is generally cylindrical and is used to connect the housing of the motor 11 and the housing of the oil pump 20. The coupling 252 is used to connect the output shaft 111 of the motor 11 and the pump shaft 21 of the oil pump 20 to improve the reliability of torque transmission between the output shaft 111 and the pump shaft 21. Specifically, a bearing 253 is provided between the coupling 252 and the connector 251 so that the coupling 252 can rotate relative to the connector 251. Preferably, a retaining ring 254 is also provided within the connector 251 for limiting the bearing 253 and the coupling 252 along the axial direction of the connector 251.

[0042] refer to Figure 5 and Figure 6 As shown, in some embodiments, the cylinder assembly 30 includes a body 31, a first nozzle 32 and a second nozzle 33 disposed on the body 31, and a control valve 34 communicating with the first nozzle 32 and the second nozzle 33 within the body 31. The first nozzle 32 and the second nozzle 33 are respectively connected to the first hydraulic chamber and the second hydraulic chamber of the actuating cylinder. When fluid is injected into the first hydraulic chamber of the actuating cylinder by the first nozzle 32, fluid in the second hydraulic chamber of the actuating cylinder enters the cylinder assembly 30 through the second nozzle 33. Similarly, when fluid is injected into the second hydraulic chamber of the actuating cylinder by the second nozzle 33, fluid in the first hydraulic chamber of the actuating cylinder enters the cylinder assembly 30 through the first nozzle 32. In this way, the actuating cylinder can convert hydraulic energy into mechanical energy, thereby performing a specific mechanical action.

[0043] The first nozzle 32 is connected to the first delivery port 22 via the control valve 34, and the second nozzle 33 is connected to the second delivery port 23 via the control valve 34. When the fluid output from the first delivery port 22 flows through the control valve 34 and the first nozzle 32 to the first hydraulic chamber of the actuating cylinder, the control valve 34 allows the fluid in the second hydraulic chamber of the actuating cylinder to flow from the second nozzle 33 to the second delivery port 23. When the fluid output from the second delivery port 23 flows through the control valve 34 and the second nozzle 33 to the second hydraulic chamber of the actuating cylinder, the control valve 34 allows the fluid in the first hydraulic chamber of the actuating cylinder to flow from the first nozzle 32 to the first delivery port 22. This enables the bidirectional hydraulic device 100 to operate in both directions.

[0044] Furthermore, the control valve 34 is configured to close the first delivery port 22 and the second delivery port 23 when the oil pump 20 stops pumping fluid, so that the fluid in the actuating cylinder cannot enter the oil pump 20 through the first delivery port 22 and / or the second delivery port 23, thereby enabling the bidirectional hydraulic device 100 to be locked in place.

[0045] Combination Figure 5 and Figure 6 As shown, in some embodiments, one end of the main body 31 is provided with a connection hole 311 for connecting the connection portion 24 of the oil pump 20. Several flow channels are provided inside the main body 31 for connecting the first nozzle 32, the second nozzle 33, and the control valve 34. The flow channels include a first flow channel 312 for connecting the first delivery port 22, a second flow channel 313 for connecting the second delivery port 23, and a third flow channel 314 for connecting the second nozzle.

[0046] In some embodiments, the control valve 34 includes a valve seat 341, a first valve core 342 and a second valve core 343 disposed within the valve seat 341, and a piston 344 disposed between the first valve core 342 and the second valve core 343. The first end 3411 of the valve seat 341 is directly connected to the first nozzle 32, while the second end 3412 of the valve seat 341 is connected to the second nozzle 33 via a third flow channel 314. Furthermore, the valve seat 341 is also provided with a first connecting hole 3413 and a second connecting hole 3414. The first valve core 342 allows the first connecting hole 3413 to connect the first flow channel 312 and the first end 3411 of the valve seat 341, so that the first nozzle 32 can connect to the first delivery port 22. The second valve core 343 allows the second connecting hole 3414 to connect the second flow channel 313 and the third flow channel 314, so that the second nozzle 33 can connect to the second delivery port 23.

[0047] In some embodiments, when the first nozzle 32 injects fluid into the first hydraulic chamber of the actuating cylinder, the fluid passing through the first valve core 342 pushes the piston 344 towards the second valve core 343 until the second valve core 343 connects the second flow channel 313 and the third flow channel 314. At this time, the fluid in the second hydraulic chamber of the actuating cylinder enters the second delivery port 23 of the oil pump 20 through the second nozzle 33, the third flow channel 314, the second valve core 343, and the second flow channel 313.

[0048] When the second nozzle 33 injects fluid into the second hydraulic chamber of the actuating cylinder, the fluid passing through the second valve core 343 pushes the piston 344 towards the first valve core 342 until the first valve core 342 connects the first flow channel 312 and the first end 3411 of the valve seat 341. At this time, the fluid in the first hydraulic chamber of the actuating cylinder enters the first delivery port 22 of the oil pump 20 through the first nozzle 32, the first valve core 342, and the first flow channel 312.

[0049] When neither the first nozzle 32 nor the second nozzle 33 supplies fluid to the actuating cylinder, the piston 344 cannot move toward the first valve core 342 or the second valve core 343. At this time, the first valve core 342 cuts off the connection between the first nozzle 32 and the first delivery port 22, and the second valve core 343 cuts off the connection between the second nozzle 33 and the second delivery port 23. Therefore, the fluid in the actuating cylinder cannot flow into the oil pump 20 through the cylinder assembly 30, thereby enabling the bidirectional hydraulic device 100 to achieve locking.

[0050] Combination Figure 6 As shown, in some preferred embodiments, the first nozzle 32, the second nozzle 33, and the second end 3412 of the valve seat 341 are all provided with filter elements 35 for filtering impurities in the fluid.

[0051] The following is combined Figure 1-6 The operation of the bidirectional hydraulic device 100 described above is explained in detail below.

[0052] When the motor 11 drives the pump shaft 21 of the oil pump 20 to rotate forward via the coupling 252 of the connecting assembly 25, the first delivery port 22 of the oil pump 20 delivers fluid into the first flow channel 312. The fluid in the first flow channel 312 flows into the valve seat 341 through the first connecting hole 3413, then passes through the first valve core 342 and enters the first hydraulic chamber of the actuating cylinder through the first nozzle 32. During this process, the fluid flowing through the first valve core 342 pushes the piston 344 towards the second valve core 343 until the second valve core 343 connects the second flow channel 313 and the third flow channel 314. The fluid in the second hydraulic chamber of the actuating cylinder flows into the cylinder assembly 30 from the second nozzle 33, then passes through the third flow channel 314, the second valve core 343, the second connecting hole 3414, and the second flow channel 313 to enter the second delivery port 23 of the oil pump 20. Driven by the motor 11, the oil pump 20 continuously pumps the fluid entering the second delivery port 23 out through the first delivery port 22. This continuously delivers fluid from the second hydraulic chamber of the actuating cylinder to the first hydraulic chamber, thereby causing the actuating cylinder to perform a forward action.

[0053] When the motor 11 drives the pump shaft 21 of the oil pump 20 to rotate in the opposite direction via the coupling 252 of the connecting assembly 25, the second delivery port 23 of the oil pump 20 delivers fluid into the second flow channel 313. After entering the valve seat 341 through the second connecting hole 3414, the fluid in the second flow channel 313 passes sequentially through the second valve core 343 and the third flow channel 314, and then enters the second hydraulic chamber of the actuating cylinder through the second nozzle 33. During this process, the fluid flowing through the second valve core 343 pushes the piston 344 towards the first valve core 342 until the first valve core 342 connects the first flow channel 312 and the first end 3411 of the valve seat 341. The fluid in the first hydraulic chamber of the actuating cylinder flows into the cylinder assembly 30 from the first nozzle 32, and then enters the first delivery port 22 of the oil pump 20 through the first valve core 342 and the first connecting hole 3413. Driven by the motor 11, the oil pump 20 continuously pumps the fluid entering the first delivery port 22 out through the second delivery port 23. This continuously transfers the fluid from the first hydraulic chamber of the actuating cylinder to the second hydraulic chamber, causing the actuating cylinder to reverse its action.

[0054] When motor 11 stops running, oil pump 20 no longer pumps fluid. Piston 344 cannot move toward the first valve core 342 or the second valve core 343. The first valve core 342 cuts off the connection between the first nozzle 32 and the first delivery port 22, and the second valve core 343 cuts off the connection between the second nozzle 33 and the second delivery port 23. At this time, the first nozzle 32 no longer supplies fluid to the first hydraulic chamber of the actuating cylinder, and the second nozzle 33 no longer supplies fluid to the second hydraulic chamber of the actuating cylinder. Therefore, the actuating cylinder cannot perform forward or reverse movements. That is, the bidirectional hydraulic device 100 achieves locking in place.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0057] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bidirectional hydraulic device, comprising, Motor assembly (10); An oil pump (20) includes a first inlet (22) and a second inlet (23) for conveying fluid. The oil pump (20) is configured to pump the fluid from the first inlet (22) to the second inlet (23) or from the second inlet (23) to the first inlet (22) under the drive of the motor assembly (10). as well as A hydraulic cylinder assembly (30) for connecting the hydraulic pump (20) includes a body (31) and a control valve (34) within the body (31) communicating with the first delivery port (22) and the second delivery port (23). The control valve (34) is configured to close the first delivery port (22) and the second delivery port (23) when the motor assembly (10) stops driving the oil pump (20).

2. The bidirectional hydraulic device according to claim 1, characterized in that, The main body (31) is provided with a first nozzle (32) and a second nozzle (33) connected to the control valve (34). The control valve (34) is configured to allow fluid to flow from the second nozzle (33) to the second nozzle (23) when the fluid flows from the first delivery port (22) to the first nozzle (32).

3. The bidirectional hydraulic device according to claim 2, characterized in that, The control valve (34) includes a valve seat (341), a first valve core (342) within the valve seat (341) for communicating with the first delivery port (22) and the first nozzle (32), and a second valve core (343) within the valve seat (341) for communicating with the second delivery port (23) and the second nozzle (33). The second valve core (343) is configured to allow fluid to flow from the second nozzle (33) to the second delivery port (23) as the fluid flows from the first delivery port (22) through the first valve core (342) to the first nozzle (32).

4. The bidirectional hydraulic device according to claim 3, characterized in that, A piston (344) is disposed between the first valve core (342) and the second valve core (343). The piston (344) is configured to move toward the second valve core (343) as the fluid flows from the first delivery port (22) through the first valve core (342) to the first nozzle (32), so that the second valve core (343) connects the second nozzle (33) and the second delivery port (23). Furthermore, the piston (344) is configured to cause the first valve core (342) to disconnect the first nozzle (32) and the first delivery port (22) when the motor assembly (10) stops driving the oil pump (20), and to cause the second valve core (343) to disconnect the second nozzle (33) and the second delivery port (23).

5. The bidirectional hydraulic device according to claim 3, characterized in that, The valve seat (341) is provided with a first connecting hole (3413) and a second connecting hole (3414). The first connecting hole (3413) connects the first valve core (342) and the first delivery port (22) through a first flow channel (312) provided on the main body (31). The second connecting hole (3414) connects the second valve core (343) and the second delivery port (23) through a second flow channel (313) provided on the main body (31).

6. The bidirectional hydraulic device according to claim 5, characterized in that, The main body (31) is also provided with a third flow channel (314) connecting the second end (3412) of the control valve (34) and the second oil nozzle (33) so that the second oil nozzle (33) can be connected to the second delivery port (23) through the second valve core (343).

7. The bidirectional hydraulic device according to claim 5, characterized in that, The oil pump (20) is provided with a connecting part (24) for arranging the first delivery port (22) and the second delivery port (23). The connecting part (24) is configured to connect the main body (31) and make the first delivery port (22) and the second delivery port (23) respectively connected to the first flow channel (312) and the second flow channel (313).

8. The bidirectional hydraulic device according to any one of claims 1-7, characterized in that, The motor assembly (10) includes a motor (11), the output shaft (111) of which is connected to the pump shaft (21) of the oil pump (20) to drive the pump shaft (21) of the oil pump (20) to rotate in the forward or reverse direction, thereby pumping the fluid from the first delivery port (22) to the second delivery port (23), or pumping the fluid from the second delivery port (23) to the first delivery port (22).

9. The bidirectional hydraulic device according to claim 8, characterized in that, A connecting assembly (25) is also provided between the motor assembly (10) and the oil pump (20) for connecting the output shaft (111) and the pump shaft (21).

10. The bidirectional hydraulic device according to claim 9, characterized in that, The connecting assembly (25) includes a connector (251) for connecting the motor (11) and the oil pump (20), and a coupling (252) disposed inside the connector (251) for connecting the output shaft (111) and the pump shaft (21).

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