Valve device and hydraulic system

Abstract

The valve device comprises a valve body, a valve clack, a valve element assembly and a stator assembly, the valve body is provided with a fluid channel, the valve clack is connected to the valve body and located in the fluid channel, the valve element assembly is movably arranged in the fluid channel, the stator assembly is arranged on the valve body, and the valve clack is connected to the valve body and located in the fluid channel. When the stator assembly is powered on, the stator assembly is in magnetic connection with the valve element assembly, and the stator assembly can drive the valve element assembly to move in the direction close to or away from the valve clack so that the fluid channel can be disconnected or communicated. The position, speed or acceleration of the valve element assembly can be accurately controlled by controlling the current of the stator assembly, the valve element assembly is directly controlled to move through electromagnetic force, a power transmission mechanism is simplified, mechanical abrasion and energy loss are reduced, the control precision and response speed of the valve device are improved, and the service life of the valve device is prolonged. And meanwhile, vibration and noise in the system are effectively inhibited.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic valves, and in particular to a valve device and a hydraulic system. Background Art

[0002] In hydraulic control systems, electromagnetically regulated hydraulic valves are key components, and their performance directly affects the overall operating efficiency and stability of the system. The design of traditional electromagnetically regulated hydraulic valves usually relies on electromagnets to convert electrical signals into mechanical torque, which in turn drives the valve core to produce displacement to accurately control the valve opening, thereby achieving precise control of the outlet pressure or flow in the hydraulic system. In this process, it is often necessary to configure complex mechanical transmission mechanisms between the motor and the hydraulic valve core, such as reducers, springs, gear transmissions, etc., to achieve effective transmission and conversion of power.

[0003] In the process of implementing this application, the inventors found that there are at least the following technical problems in the prior art: First, mechanical transmission components will inevitably suffer from wear and tear under long-term operation and high-load conditions, which not only increases maintenance costs, but also leads to a significant reduction in energy transfer efficiency, directly affecting the hydraulic valve's ability to accurately achieve the set valve opening. Secondly, nonlinear factors in the mechanical transmission process, such as gear meshing clearance, bearing friction, etc., will introduce additional errors, further weakening the accuracy and stability of the hydraulic valve in controlling outlet pressure / flow. In addition, during the system integration process, traditional electromagnetic regulating hydraulic valves often need to be used in conjunction with a variety of hydraulic components of different structural forms. This complex system configuration is very likely to induce fluid dynamics problems, such as turbulent pulsation, pressure fluctuations, etc. These problems not only aggravate the vibration and noise inside the valve body, but also significantly reduce the response speed and control accuracy of the hydraulic valve, which greatly reduces the overall dynamic performance of the system. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide a valve device and a hydraulic system that can reduce wear and ensure response speed and control accuracy.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions: A valve device, comprising: A valve body, wherein the valve body is provided with a fluid passage; a valve flap, the valve flap being connected to the valve body and being located in the fluid passage; A valve core assembly, the valve core assembly being movably disposed in the fluid passage; A stator assembly, wherein the stator assembly is arranged on the valve body; When the stator assembly is powered on, the stator assembly is magnetically connected to the valve core assembly, and the stator assembly can drive the valve core assembly to move in a direction close to or away from the valve disc, so as to disconnect or connect the fluid channel.

[0006] In some embodiments, the valve core assembly includes a permanent magnet, and the permanent magnet is disposed in the fluid channel; The valve body comprises a valve seat and an annular connecting portion, wherein the valve seat is provided with the fluid channel, the annular connecting portion is sleeved on the valve seat, and the annular connecting portion is provided with a receiving groove, and the stator assembly is arranged in the receiving groove and sleeved on the permanent magnet. In some embodiments, the valve core assembly further includes a balancer, wherein the balancer is disposed in the fluid channel, and the permanent magnet is sleeved on the balancer.

[0007] In some embodiments, the equalizer is provided with a flow channel, the flow channel is connected to the fluid channel, the inner wall of the flow channel is provided with a protrusion, and the outer surface of the protrusion is hemispherical.

[0008] In some embodiments, the valve device also includes a position sensor and a controller. The position sensor is arranged on the valve body and is used to detect the position of the valve core assembly. The controller is respectively connected to the position sensor and the stator assembly and is used to control the operation of the stator assembly based on the detection result of the position sensor.

[0009] In some embodiments, the valve device also includes a force sensor, which is arranged on the valve body and is used to detect the force condition of the valve core assembly. The controller is connected to the force sensor and is used to control the operation of the stator assembly based on the detection result of the force sensor.

[0010] In some embodiments, the valve body is provided with an inlet and an outlet communicating with the fluid passage; The valve flap includes a ball head and an extension portion, one end of the extension portion is connected to the valve body and located at the outlet, the other end of the extension portion is connected to the ball head, a ball head surface is provided on the side of the ball head facing away from the extension portion, and the extension portion is provided with a concave arc surface.

[0011] In some embodiments, the valve device further comprises a limiter, wherein the limiter is arranged at the inlet, and the limiter is provided with a through hole, wherein the diameter of the through hole is smaller than the diameter of the inlet.

[0012] In some embodiments, the valve device further comprises an elastic member, which is disposed in the fluid channel, and one end of the elastic member abuts against the valve core assembly, and the other end of the elastic member abuts against the inner wall of the fluid channel.

[0013] A hydraulic system comprises an inlet pipe, a hydraulic component, an outlet pipe and a valve device as described in any one of the above, wherein the inlet end of the hydraulic component is connected to the inlet pipe, the outlet end of the hydraulic component is connected to the outlet pipe, and the valve device is arranged on the inlet pipe or the outlet pipe.

[0014] Compared with the prior art, the valve device provided by the present application has at least the following beneficial effects: When the stator assembly of the present application is energized, a magnetic field in the axial direction is generated. The axial magnetic field generated by the stator assembly interacts with the magnetic field of the valve core assembly, causing the valve core assembly to be subjected to thrust or tension in the axial direction. The stator assembly can drive the valve core assembly to move in a direction close to or away from the valve disc to disconnect or connect the fluid channel; when the direction and magnitude of the current in the stator assembly change, the axial magnetic field generated by it will also change accordingly, thereby changing the interaction force with the valve core assembly. By precisely controlling the current in the coil, precise control of the position, speed or acceleration of the valve core assembly in the axial direction can be achieved, and the movement of the valve core assembly is directly controlled by electromagnetic force, which simplifies the power transmission mechanism, reduces mechanical wear and energy loss, improves the control accuracy and response speed of the valve device, and effectively suppresses vibration and noise inside the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of the valve device provided in an embodiment of the present application from an axial perspective; Figure 2 A cross-sectional view of a valve device provided in an embodiment of the present application in a closed state; Figure 3 A cross-sectional view of a valve device provided in an embodiment of the present application in a fully open state; Figure 4 A cross-sectional view of an axial view of a valve device provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure of a valve disc of a valve device provided in an embodiment of the present application; Figure 6 A schematic diagram of a hydraulic system provided in an embodiment of the present application.

[0016] Reference numerals: 1. Valve body; 11. Valve seat; 110. Fluid channel; 111. Outlet; 12. Valve cover; 120. Inlet; 13. Annular connecting part; 130. Accommodating groove; 131. Connecting hole; 2. Valve disc; 21. Ball head; 22. Extension; 220. Concave arc surface; 3. valve core assembly; 31. permanent magnet; 32. balancer; 320. flow channel; 321. protrusion; 4. Stator assembly; 5. Seals; 6. Cable sealing joint; 7. Elastic parts; 8. Limiting member; 81. Through hole; 100. Valve device; 201. Inlet pipe; 202. Outlet pipe; 203. Filter; 204. Pressure vessel; 205. Centrifugal pump; 206. Plate heat exchanger; 207. Heating pipe; 208. Compressor; 209. Blower cooler. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more, and the term "multiple" refers to two or more; the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0019] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0020] Reference Figure 1-3 As shown, Figure 1 This is a schematic diagram of the structure of the valve device provided in the embodiment of the present application from an axial perspective. Figure 2 A cross-sectional view of a valve device in a closed state provided in an embodiment of the present application, Figure 3The cross-sectional view of the valve device provided in the embodiment of the present application in a fully open state. The present embodiment discloses a valve device 100, which includes a valve body 1, a valve flap 2, a valve core assembly 3 and a stator assembly 4. The valve body 1 includes a valve seat 11, a valve cover 12 and an annular connecting portion 13. The valve seat 11 is provided with a fluid channel 110 and an outlet 111 that are interconnected. The annular connecting portion 13 is sleeved on the valve seat 11, and the annular connecting portion 13 is provided with a receiving groove 130. The valve cover 12 is covered on the valve seat 11 and the receiving groove 130, and the valve cover 12 is provided with an inlet 120, and the inlet 120 is connected to the outlet 111 through the fluid channel 110. The valve flap 2 is connected to the valve seat 11 and is located in the fluid channel 110. In the radial direction, the valve flap 2 is located in the middle of the fluid channel 110. The valve core assembly 3 is movably arranged in the fluid channel 110. The stator assembly 4 is arranged in the receiving groove 130. When the stator assembly 4 is powered on, the stator assembly 4 is magnetically connected to the valve core assembly 3, and the stator assembly 4 can drive the valve core assembly 3 to move in a direction close to or away from the valve disc 2, so as to disconnect or connect the fluid channel 110. Figure 2 The X direction in .

[0021] In this embodiment, the valve device 100 also includes a sealing member 5. The valve seat 11 is provided with a step. The sealing member 5 is arranged on the step, and one end of the sealing member 5 abuts against the inner wall of the step, and the other end of the sealing member 5 abuts against the valve cover 12 to ensure the sealing of the connection between the valve cover 12 and the valve seat 11.

[0022] In this embodiment, the valve cover 12 is provided with an internal thread, and the valve seat 11 is provided with an external thread. The valve cover 12 and the valve seat 11 are threadedly connected via the internal thread and the external thread. The threaded connection has high connection strength, thereby ensuring the stability and reliability of the connection between the valve cover 12 and the valve seat 11. It can be understood that in other embodiments, the valve cover 12 and the valve seat 11 can also be connected in other ways, such as a snap-fit ​​connection, a bolt connection, etc.

[0023] In this embodiment, the annular connecting portion 13 and the valve seat 11 are integrally formed to facilitate manufacturing. It can be understood that in other embodiments, the annular connecting portion 13 and the valve seat 11 may also be a separate structure.

[0024] In this embodiment, when the stator assembly 4 is energized, the stator assembly 4 is magnetically connected to the valve core assembly 3, and the stator assembly 4 can drive the valve core assembly 3 to move in a direction close to or away from the valve disc 2 to disconnect or connect the fluid channel 110. This embodiment can accurately control the position, speed or acceleration of the valve core assembly 3 by controlling the current of the stator assembly 4, and directly control the movement of the valve core assembly 3 by electromagnetic force, which simplifies the power transmission mechanism, reduces mechanical wear and energy loss, improves the control accuracy and response speed of the valve device 100, and effectively suppresses the vibration and noise inside the system.

[0025] Reference Figure 2 and Figure 3 As shown, the valve core assembly 3 includes a permanent magnet 31, which is arranged in the fluid channel 110, and the permanent magnet 31 is in a ring shape, and the outer surface of the permanent magnet 31 abuts against the inner surface of the fluid channel 110. The stator assembly 4 includes an iron core, a coil and a connecting wire, and the iron core is arranged in the receiving groove 130, and the iron core is in a ring shape, and the iron core is sleeved on the permanent magnet 31. The coil is wound around the iron core. One end of the connecting wire is connected to the coil, and the other end of the connecting wire is used to connect to the power supply device. When the coil is energized, a magnetic field in the axial direction is generated. The axial magnetic field generated by the coil interacts with the magnetic field of the permanent magnet 31. According to the principle of electromagnetism, like poles repel each other and opposite poles attract each other. This interaction force will cause the permanent magnet 31 to be subjected to thrust or pull in the axial direction. When the direction and magnitude of the current in the coil change, the axial magnetic field generated by it will also change accordingly, thereby changing the interaction force with the permanent magnet 31. By precisely controlling the current in the coil, precise control of the position, speed or acceleration of the permanent magnet 31 in the axial direction can be achieved.

[0026] During operation, when the permanent magnet 31 abuts against the valve flap 2, the fluid channel 110 is in a disconnected state; when the permanent magnet 31 does not abut against the valve flap 2 and the permanent magnet 31 is not at the inlet 120, the fluid channel 110 is in a connected state; when the permanent magnet 31 is located at the inlet 120, the fluid channel 110 is in a fully open state.

[0027] In this embodiment, the annular connecting portion 13 is provided with a connecting hole 131, and the connecting wire is passed through the connecting hole 131. The valve device 100 also includes a cable sealing joint 6, which is arranged at the connecting hole 131 and wrapped around the connecting wire. The cable sealing joint 6 is used to ensure the continuity and sealing of the line to prevent moisture, humidity and other impurities from causing damage to the connecting wire or electrical failure, thereby ensuring the stable operation of the valve device 100.

[0028] Reference Figure 2 and Figure 3 As shown, the valve core assembly 3 further includes an equalizer 32, which is disposed in the fluid channel 110, and the permanent magnet 31 is sleeved on the equalizer 32. The equalizer 32 is provided with a flow channel 320, and the flow channel 320 is communicated with the fluid channel 110. The liquid entering from the inlet 120 will flow out from the outlet 111 through the flow channel 320. The equalizer 32 is used to increase the flow uniformity of the liquid in the fluid channel 110, and the equalizer 32 can reduce noise pollution by diffusing and absorbing sound wave energy, thereby improving the applicability of the valve device 100.

[0029] In this embodiment, the inner wall of the flow channel 320 is provided with a protrusion 321, and the outer surface of the protrusion 321 is hemispherical, thereby reducing the friction of the fluid in the flow channel 320, reducing the flow resistance, and improving the flow efficiency of the fluid.

[0030] Reference Figure 2-Figure 5 As shown, Figure 4 This is a cross-sectional view of the valve device provided in the embodiment of the present application from an axial perspective. Figure 5 A schematic diagram of the structure of the valve flap of the valve device provided in an embodiment of the present application. The valve flap 2 includes a ball head 21 and an extension portion 22, one end of the extension portion 22 is connected to the valve seat 11 and is located at the outlet 111, and the other end of the extension portion 22 is connected to the ball head 21. A ball head surface is provided on the side of the ball head 21 facing away from the extension portion 22 to reduce the friction between the fluid and the valve flap 2, reduce the flow resistance of the fluid, and improve the flow efficiency of the fluid. The extension portion 22 is provided with a concave arc surface 220 to guide the flow of the liquid and ensure the stability of the liquid flow. The streamlined design of the valve flap 2 reduces the resistance of the liquid when passing through the valve device 100, thereby improving the flow efficiency of the liquid.

[0031] Reference Figure 2-Figure 3 As shown, the valve device 100 further includes an elastic member 7 and a stopper 8. The elastic member 7 is disposed in the fluid channel 110, and one end of the elastic member 7 abuts against the permanent magnet 31, and the other end of the elastic member 7 abuts against the inner wall of the fluid channel 110. The outer surface of the elastic member 7 abuts against the inner surface of the fluid channel 110 to reduce the displacement of the elastic member 7 when compressed, thereby ensuring the normal operation of the valve device 100. The elastic member 7 is used to ensure that the permanent magnet 31 can be quickly reset to the fully open state when the coil is powered off, so as to ensure the safe and stable operation of the system.

[0032] The limit member 8 is connected to the valve cover 12 and is located at the inlet 120, and the limit member 8 is provided with a through hole 81, and the diameter D1 of the through hole 81 is smaller than the diameter D2 of the inlet 120, so that the permanent magnet 31 can be limited in the axial direction by the limit member 8, thereby reducing the situation where the permanent magnet 31 is separated from the fluid channel 110, and ensuring the normal operation of the valve device 100.

[0033] The valve device 100 further includes a position sensor, a force sensor and a controller, wherein the position sensor and the force sensor are respectively arranged on the valve seat 11. The position sensor is used to detect the position of the permanent magnet 31, and the force sensor is used to detect the force applied to the permanent magnet 31. The controller is respectively connected to the position sensor and the force sensor, and the controller is electrically connected to the coil, and the controller is used to control the coil to be energized or de-energized based on the detection result of the position sensor, and to control the direction and magnitude of the coil current based on the detection result of the force sensor.

[0034] During operation, the position and force conditions of the permanent magnet 31 are monitored in real time through the position sensor and the force sensor. Then the controller drives the current direction in the coil to reverse, generating a repulsive force with the same magnetic pole as the permanent magnet 31. The repulsive force pushes the permanent magnet 31 to move, so that the fluid channel 110 is in a fully open state, and the position sensor is used to confirm whether the permanent magnet 31 has reached the predetermined position.

[0035] In a specific application scenario, when the valve device 100 is in an initial state, the coil is not energized, the valve device 100 is in a standby state, and the fluid flows in from the inlet 120 through the fluid channel 110 and flows out from the outlet 111. During this process, the permanent magnet 31 is affected by the initial fluid flow and pressure and is in a dynamic equilibrium position. At the same time, the elastic member 7 maintains a certain preload force to ensure the initial stability of the permanent magnet 31. When the flow and pressure need to be adjusted, the controller monitors the position and force of the permanent magnet 31 in real time through the position sensor and force sensor according to the system requirements, and then adjusts the direction and size of the current in the coil to generate a changing axial magnetic field, thereby changing the interaction force with the permanent magnet 31 (NS attraction or NN repulsion). In this process, the elastic force of the elastic member 7 acts as an auxiliary adjustment factor, and works together with the electromagnetic force to achieve precise position control of the permanent magnet 31 in the axial direction. By dynamically adjusting the balance between the electromagnetic force and the elastic force, the precise control requirements for flow and pressure under different working conditions are met.

[0036] When the valve device 100 needs to be fully opened to allow the maximum flow to pass, after receiving the command, the controller monitors the position and force of the permanent magnet 31 in real time through the position sensor and force sensor, and then drives the current direction in the coil to reverse, generating a repulsive force with the same magnetic pole (NN) as the permanent magnet 31. This repulsive force can push the permanent magnet 31 to move to the fully open position until the position sensor confirms that the permanent magnet 31 has reached the predetermined position. At the same time, the controller adjusts the size of the coil current to accurately control the repulsive force to overcome the flow and pressure in the system and ensure the stable output of the maximum flow and minimum pressure.

[0037] When the valve device 100 needs to be closed to cut off the flow of fluid, the controller adjusts the current in the coil again through the force sensor, so that the permanent magnet 31 is sufficiently attracted and the elastic force of the elastic member 7 works together to overcome the liquid pressure and the pre-tightening force of the elastic member 7, and push the permanent magnet 31 to the closed position. During this process, the position sensor continuously monitors the position of the permanent magnet 31 to ensure that the valve device 100 is completely closed and achieves a zero flow state. At the same time, the design of the elastic member 7 ensures that the permanent magnet 31 can automatically reset to the fully open position in the event of a power outage, thereby increasing the reliability and stability of the system.

[0038] Reference Figure 6 As shown, Figure 6 Schematic diagram of the hydraulic system provided for the embodiment of the present application. Based on the present embodiment, a hydraulic system is also disclosed, which includes an inlet pipe 201, a hydraulic component, an outlet pipe 202 and a valve device 100 of any of the above items, the hydraulic component includes a compressor 208, a blower cooler 209, and a filter 203, a pressure vessel 204, a centrifugal pump 205, a plate heat exchanger 206 and a heating pipe 207 connected in sequence through pipelines, the inlet end of the filter 203 is connected to the inlet pipe 201, and the outlet end of the heating pipe 207 is connected to the outlet pipe 202. The filter 203 is used to filter impurities in the pipeline to reduce friction and wear of the system and ensure the normal operation of the hydraulic system. The pressure vessel 204 is used to maintain a certain pressure level in the system to ensure the stable operation of the system. The centrifugal pump 205 is used to drive the flow of fluid in the pipeline. The compressor 208 is connected to the plate heat exchanger 206, and the blast cooler 209 is connected to the compressor 208. The compressor 208 is used to drive the fluid in the blast cooler 209 to exchange heat with the fluid in the plate heat exchanger 206 to adjust the temperature of the fluid in the pipeline to ensure that the hydraulic system can operate continuously and normally. The heating pipeline 207 is used to heat the fluid to ensure that the viscosity of the hydraulic oil is within an appropriate range, thereby making the equipment run more smoothly and extending the service life of the equipment.

[0039] In this embodiment, the valve device 100 is disposed on the inlet pipe 201 to adjust the flow rate and pressure of the fluid entering the pipeline to ensure stable operation of the system. It can be understood that in other embodiments, the valve device 100 can also be disposed on the outlet pipe 202.

[0040] This embodiment integrates the valve device 100 into the hydraulic system. According to the flow and pressure requirements, the valve device 100 can be flexibly placed at the inlet or outlet of the system, so that the valve device 100 can be used for flow and pressure regulation of multiple key components in the hydraulic system at the same time, so as to comprehensively regulate the flow and pressure fluctuations of each device, thereby making the system operation more stable.

[0041] In some embodiments, the valve device 100 can also be independent of the hydraulic system. The valve device 100 can be installed on multiple different or identical hydraulic systems. By externally installing a flow and pressure regulating hydraulic valve, the flow and pressure of multiple identical or different hydraulic systems can be controlled, thereby improving the regulation efficiency and reducing the demand for internal space of the system.

[0042] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A valve device, characterized in that: include: A valve body, wherein the valve body is provided with a fluid passage; a valve flap, the valve flap being connected to the valve body and being located in the fluid passage; A valve core assembly, the valve core assembly being movably disposed in the fluid passage; A stator assembly, wherein the stator assembly is arranged on the valve body; When the stator assembly is powered on, the stator assembly is magnetically connected to the valve core assembly, and the stator assembly can drive the valve core assembly to move in a direction close to or away from the valve disc, so as to disconnect or connect the fluid channel.

2. The valve device according to claim 1, characterized in that The valve core assembly includes a permanent magnet, and the permanent magnet is arranged in the fluid channel; The valve body comprises a valve seat and an annular connecting portion, the valve seat is provided with the fluid channel, the annular connecting portion is sleeved on the valve seat, and the annular connecting portion is provided with a receiving groove, the stator assembly is arranged in the receiving groove and sleeved on the permanent magnet.

3. The valve device according to claim 2, characterized in that The valve core assembly further includes a balancer, which is arranged in the fluid channel, and the permanent magnet is sleeved on the balancer.

4. The valve device according to claim 3, characterized in that The equalizer is provided with a flow channel, the flow channel is communicated with the fluid channel, the inner wall of the flow channel is provided with a protrusion, and the outer surface of the protrusion is hemispherical.

5. The valve device according to claim 1, characterized in that The valve device also includes a position sensor and a controller. The position sensor is arranged on the valve body and is used to detect the position of the valve core assembly. The controller is connected to the position sensor and the stator assembly respectively and is used to control the operation of the stator assembly based on the detection result of the position sensor.

6. The valve device according to claim 5, characterized in that The valve device also includes a force sensor, which is arranged on the valve body and is used to detect the force condition of the valve core assembly. The controller is connected to the force sensor and is used to control the operation of the stator assembly based on the detection result of the force sensor.

7. The valve device according to claim 1, characterized in that The valve body is provided with an inlet and an outlet communicated with the fluid channel; The valve flap includes a ball head and an extension portion, one end of the extension portion is connected to the valve body and located at the outlet, the other end of the extension portion is connected to the ball head, a ball head surface is provided on the side of the ball head facing away from the extension portion, and the extension portion is provided with a concave arc surface.

8. The valve device according to claim 7, characterized in that The valve device further comprises a limiting member, which is arranged at the inlet and is provided with a through hole, wherein the diameter of the through hole is smaller than the diameter of the inlet.

9. The valve device according to any one of claims 1 to 8, characterized in that: The valve device further comprises an elastic member, which is arranged in the fluid channel, and one end of the elastic member abuts against the valve core assembly, and the other end of the elastic member abuts against the inner wall of the fluid channel.

10. A hydraulic system, characterized in that: It comprises an inlet pipe, a hydraulic component, an outlet pipe and a valve device as described in any one of claims 1 to 9, wherein the inlet end of the hydraulic component is connected to the inlet pipe, the outlet end of the hydraulic component is connected to the outlet pipe, and the valve device is arranged on the inlet pipe or the outlet pipe.

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