Control valve group

Abstract

The application discloses a control valve group, which comprises a valve body, a main flow valve core and a flow control structure. The valve body comprises a main flow channel, an oil inlet channel, an oil return channel and a working channel. The main flow channel comprises a communication part, an oil inlet part and an oil outlet part. The flow control structure comprises a conical wall group and a ring wall group. The conical wall group comprises a first conical wall and a second conical wall. The ring wall group comprises a first ring wall and a second ring wall. The first ring wall and the second ring wall are both annular and correspond to the peripheral wall of the main flow valve core. The main flow valve core moves in the main flow channel so that the first conical wall abuts against the first ring wall or the second conical wall abuts against the second ring wall, thereby cutting off the oil inlet part from the communication part or cutting off the communication part from the oil outlet part, and sealing in a linear contact mode. Compared with a common spool structure, the sealing performance is better, zero leakage is achieved, and the response speed is faster.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to control valve assemblies. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium. They are commonly used in various industries. Currently, most valves adopt a slide valve structure, achieving sealing through surface contact.

[0003] refer to Figures 1 to 2 In this type of valve, the valve body 10A has an oil inlet channel 101A, an oil return channel 102A, and a working channel 103A. The valve core 20A forms an oil inlet groove 201A, an oil outlet groove 202A, and a boss 21A located between the oil inlet groove 201A and the oil outlet groove 202A in the circumferential direction. The valve core 20A forms an oil outlet channel 203A in the axial direction, and the portion of the valve core 20A that forms the oil outlet groove 202A forms a connecting channel 204A in the radial direction that communicates with the oil outlet channel 203A. The oil inlet groove 201A communicates with the oil inlet channel 101A, the oil outlet groove 202A communicates with the connecting channel 204A, and the oil outlet channel 203A communicates with the oil return channel 102A. The valve core 20A is driven to move within the valve body 10A, such that the boss 21A abuts against the inner wall of the valve body 10A opposite to the oil inlet groove 201A or the inner wall of the valve body 10A opposite to the oil outlet groove 202A, while the oil outlet groove 202A or the oil inlet groove 201A at least partially corresponds to the working channel 103A. When the valve core 20A is not subjected to external force, i.e., in the neutral position, the inlet groove 201A is offset from the working channel 103A, and the outlet groove 202A corresponds at least partially to the working channel 103A. The hydraulic oil introduced into the working channel 103A can enter the outlet groove 202A and enter the outlet channel 203A through the connecting channel 204A, and finally enter the return channel 102A. When the valve core 20A is driven to move, i.e. in the reversing state, the inlet groove 201A corresponds at least partially to the working channel 103A, and the outlet groove 202A is offset from the working channel 103A. The hydraulic oil introduced into the inlet channel 101A is introduced into the working channel 103A through the inlet groove 201A.

[0004] During this process, the valve core 20A abuts against the inner wall of the valve body 10A opposite to the oil inlet groove 201A or the inner wall of the valve body 10A opposite to the oil outlet groove 202A via the boss 21A, thereby blocking the working channel 103A from the oil inlet groove 201A or the oil outlet groove 202A. This sealing is achieved through surface contact, which may result in hydraulic oil overflowing from the gap between the boss 21A and the inner wall of the valve body 10A, posing a relatively high risk of leakage. Furthermore, since the boss 21A must move to abut against and separate from either the inner wall of the valve body 10A opposite to the oil inlet groove 201A or the inner wall of the valve body 10A opposite to the oil outlet groove 202A to switch the hydraulic oil flow, the response speed is clearly slow. Additionally, due to the clearance fit between the valve core 20A and the valve body 10A, slight fluctuations in the movement direction of the valve core 20A or the influence of impurities in the hydraulic oil may cause jamming. Utility Model Content

[0005] To address the aforementioned technical problems and achieve at least one advantage of this application, this application provides a control valve assembly, the control valve assembly comprising:

[0006] The valve body includes a main flow channel, an oil inlet channel, a return channel, and a working channel. The main flow channel includes a connecting portion, an oil inlet portion, and an oil outlet portion. The two ends of the connecting portion extend in opposite directions to form the oil inlet portion and the oil outlet portion, respectively. The oil inlet portion is connected to the oil outlet portion through the connecting portion. The oil inlet channel is connected to the oil inlet portion. The return channel is connected to the oil outlet portion. The working channel is connected to the connecting portion.

[0007] A main valve core is mounted on the valve body in a manner that allows it to be driven to move within the main channel;

[0008] A flow control structure includes a conical wall assembly and a ring wall assembly. The conical wall assembly includes a first conical wall and a second conical wall. The ring wall assembly includes a first ring wall and a second ring wall. Either the first conical wall or the first ring wall is formed on the portion of the valve body located near the connecting portion of the oil inlet, and the other is formed on the main flow valve core. Either the second conical wall or the second ring wall is formed on the portion of the valve body located near the connecting portion of the oil outlet, and the other is formed on the main flow valve core. The first conical wall corresponds to the first ring wall, and the second conical wall corresponds to the... The second ring wall corresponds to the first ring wall and the second ring wall, which are both encircling the outer periphery of the main flow valve core and corresponding to the peripheral wall of the main flow valve core. A cross-section is made along the moving direction of the main flow valve core. The cross-section lines on the same side of the first ring wall and the first conical wall extend and intersect, and the cross-section lines on the same side of the second ring wall and the second conical wall extend and intersect. The main flow valve core moves in the main flow channel so that the first conical wall abuts against the first ring wall in a line contact manner or the second conical wall abuts against the second ring wall in a line contact manner, so as to isolate the oil inlet from the connecting part or the connecting part from the oil outlet.

[0009] According to one embodiment of this application, both the first conical wall and the second conical wall are formed on the main flow valve core. The first ring wall and the second ring wall are respectively implemented as the inner walls of the oil inlet and the oil outlet. The length direction of the first ring wall and the second ring wall is parallel to the moving direction of the main flow valve core. Taking the direction extending from the oil inlet to the connecting portion as a reference, the cross-sectional dimension of the portion of the main flow valve core forming the first conical wall gradually increases, and the cross-sectional dimension of the portion of the main flow valve core forming the second conical wall gradually decreases. When the main flow valve core moves and the first conical wall abuts against the first ring wall or the second conical wall abuts against the second ring wall, the portion of the main flow valve core forming the first conical wall is inserted into one end of the oil inlet near the connecting portion, or the portion of the main flow valve core forming the second conical wall is inserted into one end of the oil outlet near the connecting portion.

[0010] According to one embodiment of this application, the control valve assembly includes at least one reset member connected to the main flow valve core. The reset member is configured to undergo elastic deformation when the main flow valve core is driven to move, and the reset member can reset the main flow valve core when it is not subjected to external force.

[0011] According to one embodiment of this application, the control valve assembly further includes at least one control mechanism, which is installed on the valve body and corresponds to one end of the mainstream valve core. The control mechanism is configured to drive the mainstream valve core to move within the mainstream channel.

[0012] According to one embodiment of this application, both the control mechanism and the reset member are provided. After the main flow valve core is moved by the control mechanism, the first conical wall separates from the first ring wall, and the second conical wall abuts against the second ring wall. At the same time, the reset member undergoes elastic deformation. When the force applied to the main flow valve core by the control mechanism is removed, the main flow valve core is reset by the elastic action of the reset member, so that the first conical wall abuts against the first ring wall, and the second conical wall separates from the second ring wall.

[0013] According to one embodiment of this application, the main valve core includes a first valve core and a second valve core, wherein the first valve core extends from the oil inlet to the connecting portion, and the second valve core extends from the oil outlet to the connecting portion. The portion of the first valve core located in the connecting portion forms a first conical wall or a first ring wall, and the portion of the second valve core located in the connecting portion forms a second conical wall or a second ring wall. The reset member is connected to the second valve core, and the control mechanism is located on the side of the first valve core away from the second valve core. When the control mechanism drives the first valve core to move, the first valve core abuts against the second valve core and pushes the second valve core to move together. At the same time, the reset member undergoes elastic deformation. When the force applied to the first valve core by the control mechanism is removed, the second valve core resets under the elastic force of the reset member and pushes the first valve core to reset.

[0014] According to one embodiment of this application, the control mechanism includes a pushing assembly, which includes an armature and a pushing member. The pushing member is disposed between the armature and the main flow valve core. The control mechanism includes a coil and a mounting housing. The mounting housing is mounted on the valve body. The coil is disposed inside the mounting housing. The armature is magnetically connected to the coil. The coil is configured to magnetize the armature and drive the armature to move in the direction extending from the oil inlet to the connecting portion, thereby pushing the pushing member to move synchronously. This causes the pushing member to push the main flow valve core to move within the main flow channel.

[0015] According to one embodiment of this application, the control valve assembly further includes an overflow mechanism, and the valve body also has an overflow channel communicating with the communicating portion. The overflow mechanism is installed on the valve body and is configured to detect the pressure of hydraulic oil in the overflow channel and overflow by connecting the overflow channel and the return oil channel to control the pressure of hydraulic oil in the working channel within a predetermined pressure range.

[0016] According to one embodiment of this application, the overflow mechanism includes an overflow valve core, an elastic element, and an assembly housing. The assembly housing is installed on the valve body. The overflow valve core is movably installed inside the assembly housing and positioned at one end of the return oil channel near the overflow channel. The two ends of the elastic element are respectively connected to the overflow valve core and the inner wall of the assembly housing. The portion of the valve body located on the side of the overflow channel near the return oil channel forms an abutment ring wall corresponding to the overflow valve core. When the oil pressure in the overflow channel is lower than a predetermined pressure value, the overflow valve core can be held against the abutment ring wall by the elastic force of the elastic element. When the oil pressure in the overflow channel is higher than the predetermined pressure value, the overflow valve core can be pushed by hydraulic oil and separated from the abutment ring wall, while the elastic element undergoes elastic deformation.

[0017] According to one embodiment of this application, with reference to the direction of the overflow valve core away from the abutment ring wall, the cross-sectional dimension of the end of the overflow valve core near the abutment ring wall gradually increases. When a cross-section is taken along the moving direction of the overflow valve core, the cross-sectional line of the abutment ring wall and the end of the overflow valve core near the abutment ring wall on the same side extends and intersects. The peripheral wall of one end of the overflow valve core corresponds at least partially to the abutment ring wall and abuts against the abutment ring wall in a line contact manner to seal the overflow channel. Attached Figure Description

[0018] Figure 1 A structural cross-sectional view of an existing valve in one state is shown.

[0019] Figure 2 A structural cross-sectional view of an existing valve in another configuration is shown.

[0020] Figure 3 A cross-sectional view of the control valve assembly described in this application in one state is shown.

[0021] Figure 4 It shows Figure 3 Enlarged view of a local structure.

[0022] Figure 5 A cross-sectional view of the control valve assembly described in this application is shown in another state.

[0023] Figure 6 It shows Figure 5 Enlarged view of a local structure. Detailed Implementation

[0024] The following description is intended to disclose this application and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of this application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of this application.

[0025] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "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 this application and simplifying the description, and do not 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, the above terms should not be construed as limitations on this application.

[0026] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0027] refer to Figures 3 to 6 A preferred embodiment of the control valve assembly according to this application will be described in detail below. The control valve assembly includes a valve body 10, which includes a main flow channel 101, an oil inlet channel 102, an oil return channel 103, and a working channel 104. The main flow channel 101 includes a connecting portion 1011, an oil inlet portion 1012, and an oil outlet portion 1013. The two ends of the connecting portion 1011 extend in opposite directions to form the oil inlet portion 1012 and the oil outlet portion 1013, respectively, and the oil inlet portion 1012 is connected to the oil outlet portion 1013 through the connecting portion 1011. The oil inlet channel 102 is connected to the oil inlet portion 1012, the oil return channel 103 is connected to the oil outlet portion 1013, and the working channel 104 is connected to the connecting portion 1011.

[0028] The control valve assembly includes a main valve core 20, which is mounted on the valve body 10 in a manner that allows it to be driven to move within the main channel 101.

[0029] The control valve assembly further includes a flow control structure 30, which includes a conical wall assembly 31 and a ring wall assembly 32. The conical wall assembly 31 includes a first conical wall 311 and a second conical wall 312, and the ring wall assembly 32 includes a first ring wall 321 and a second ring wall 322. Either the first conical wall 311 or the first ring wall 321 is formed on the portion of the valve body 10 located on the side of the oil inlet 1012 near the connecting portion 1011, and the other is formed on the main flow valve core 20. Similarly, either the second conical wall 312 or the second ring wall 322 is formed on the portion of the valve body 10 located on the side of the oil outlet 1013 near the connecting portion 1011, and the other is formed on the main flow valve core 20. The first conical wall 311 corresponds to the first ring wall 321, and the second conical wall 312 corresponds to the second ring wall 322.

[0030] Both the first annular wall 321 and the second annular wall 322 encircle the outer periphery of the main flow valve core 20 and correspond to the peripheral wall of the main flow valve core 20. Taking a cross-section along the moving direction of the main flow valve core 20, the cross-sectional lines on the same side of the first annular wall 321 and the first conical wall 311 intersect, and the cross-sectional lines on the same side of the second annular wall 322 and the second conical wall 312 intersect. The main flow valve core 20 moves within the main flow channel 101 so that the first conical wall 311 abuts against the first annular wall 321 in line contact, or the second conical wall 312 abuts against the second annular wall 322 in line contact, thereby isolating the oil inlet 1012 from the connecting portion 1011 or isolating the connecting portion 1011 from the oil outlet 1013.

[0031] Specifically, when the main flow valve core 20 moves so that the first conical wall 311 abuts against the first ring wall 321 in a line contact manner, the second conical wall 312 separates from the second ring wall 322. At this time, the connecting part 1011 is separated from the oil inlet part 1012 and connected to the oil outlet part 1013. The hydraulic oil introduced into the working channel 104 enters the oil outlet part 1013 through the connecting part 1011 and finally flows to the return oil channel 103. When the main flow valve core 20 moves so that the second conical wall 312 abuts against the second ring wall 322 in a line contact manner, the first conical wall 311 separates from the first ring wall 321. At this time, the connecting part 1011 is connected to the oil inlet part 1012 and blocked from the oil outlet part 1013. The hydraulic oil introduced into the oil inlet channel 102 enters the oil inlet part 1012 and is guided to the working channel 104 through the connecting part 1011.

[0032] During this process, the first conical wall 311 abuts against the first annular wall 321, and the second conical wall 312 and the second annular wall 322 abut against each other to achieve sealing through line contact. Compared with common spool valve structures, this provides better sealing, achieves zero leakage, and offers faster response, effectively reducing oil pressure energy loss. Furthermore, the hydraulic oil flows rapidly, maintaining high-pressure output even at low flow rates. Additionally, based on the cooperation method between the main valve core 20 and the valve body 10, it offers higher fault tolerance, and impurities in the hydraulic oil are less likely to become embedded, effectively avoiding jamming compared to common spool valve structures.

[0033] Preferably, both the first conical wall 311 and the second conical wall 312 are formed in the main flow valve core 20, and the first annular wall 321 and the second annular wall 322 are respectively implemented as the inner walls of the oil inlet portion 1012 and the oil outlet portion 1013. The length direction of the first annular wall 321 and the second annular wall 322 is parallel to the moving direction of the main flow valve core 20. Taking the direction extending from the oil inlet portion 1012 to the connecting portion 1011 as a reference, the cross-sectional dimension of the portion of the main flow valve core 20 forming the first conical wall 311 gradually increases, and the cross-sectional dimension of the portion of the main flow valve core 20 forming the second conical wall 312 gradually decreases. When the main flow valve core 20 moves such that the first conical wall 311 abuts against the first ring wall 321 or the second conical wall 312 abuts against the second ring wall 322, the portion of the main flow valve core 20 forming the first conical wall 311 is inserted into the oil inlet 1012 near the end of the connecting portion 1011, or the portion of the main flow valve core 20 forming the second conical wall 312 is inserted into the oil outlet 1013 near the end of the connecting portion 1011.

[0034] The control valve assembly includes at least one reset member 40, which is connected to the main valve core 20. The reset member 40 is configured to undergo elastic deformation when the main valve core 20 is driven to move, and the reset member 40 can reset the main valve core 20 when it is not subjected to external force.

[0035] Furthermore, the control valve assembly also includes at least one control mechanism 50, which is installed on the valve body 10 and corresponds to one end of the main valve core 20. The control mechanism 50 is configured to drive the main valve core 20 to move within the main channel 101.

[0036] Preferably, both the control mechanism 50 and the reset member 40 are provided in one unit. After the main flow valve core 20 is moved by the control mechanism 50, the first conical wall 311 separates from the first ring wall 321, and the second conical wall 312 abuts against the second ring wall 322, while the reset member 40 undergoes elastic deformation. When the force applied to the main flow valve core 20 by the control mechanism 50 is removed, the main flow valve core 20 is reset by the elastic action of the reset member 40, so that the first conical wall 311 abuts against the first ring wall 321, and the second conical wall 312 separates from the second ring wall 322.

[0037] Furthermore, the control mechanism 50 includes a pushing component 51, which corresponds to one end of the main flow valve core 20. The pushing component 51 is configured to drive the main flow valve core 20 to move within the main flow channel 101.

[0038] The pushing assembly 51 includes an armature 511 and a pushing member 512, the pushing member 512 being disposed between the armature 511 and the main flow valve core 20. The control mechanism 50 includes a coil 52 and a mounting housing 53, the mounting housing 53 being mounted on the valve body 10, the coil 52 being disposed within the mounting housing 53, the armature 511 being magnetically connected to the coil 52, the coil 52 being configured to magnetize the armature 511 and drive the armature 511 to move in the direction extending from the oil inlet 1012 to the connecting portion 1011, and push the pushing member 512 to move synchronously, thereby causing the pushing member 512 to push the main flow valve core 20 to move within the main flow channel 101.

[0039] Preferably, the armature 511 is made of a soft magnetic material.

[0040] Further, the main valve core 20 includes a first valve core 21 and a second valve core 22, wherein the first valve core 21 extends from the oil inlet portion 1012 to the connecting portion 1011, and the second valve core 22 extends from the oil outlet portion 1013 to the connecting portion 1011. The portion of the first valve core 21 located in the connecting portion 1011 forms the first conical wall 311 or the first annular wall 321, and the portion of the second valve core 22 located in the connecting portion 1011 forms the second conical wall 312 or the second annular wall 322. The reset member 40 is connected to the second valve core 22, and the control mechanism 50 is located on the side of the first valve core 21 away from the second valve core 22. When the control mechanism 50 drives the first valve core 21 to move, the first valve core 21 abuts against the second valve core 22 and pushes the second valve core 22 to move together, while the reset member 40 undergoes elastic deformation; when the force applied by the control mechanism 50 to the first valve core 21 is removed, the second valve core 22 resets under the elastic force of the reset member 40 and pushes the first valve core 21 to reset.

[0041] Furthermore, the first valve core 21 has a first through hole 2101, and the second valve core 22 has a second through hole 2201. The first through hole 2101 corresponds to the second through hole 2201. One end of the first through hole 2101 away from the second through hole 2201 communicates with the portion of the oil inlet 1012 located on the side of the first valve core 21 away from the second valve core 22 and corresponds to the mounting housing 53. One end of the second through hole 2201 away from the first through hole 2101 communicates with the portion of the oil outlet 1013 located on the side of the second valve core 22 away from the first valve core 21. Hydraulic oil in the connecting portion 1011 can be introduced into the first through hole 2101 and the second through hole 2201 through the gap between the first valve core 21 and the second valve core 22, so as to introduce hydraulic oil into the portion of the oil inlet 1012 located on the side of the first valve core 21 away from the second valve core 22 and the portion of the oil outlet 1013 located on the side of the second valve core 22 away from the first valve core 21, so that the main valve core 20 can move smoothly, and the hydraulic oil introduced into the portion of the oil inlet 1012 located on the side of the first valve core 21 away from the second valve core 22 can be introduced into the mounting housing 53, thereby providing lubrication for the movement of the pushing assembly 51.

[0042] Furthermore, the control valve assembly also includes an overflow mechanism 60, and the valve body 10 also has an overflow channel 105 communicating with the communication portion 1011. The overflow mechanism 60 is installed on the valve body 10, and the overflow mechanism 60 is configured to detect the pressure of the hydraulic oil in the overflow channel 105 and overflow by communicating the overflow channel 105 and the return oil channel 103 to control the pressure of the hydraulic oil in the working channel 104 within a predetermined pressure range.

[0043] The overflow mechanism 60 includes an overflow valve core 61, an elastic element 62, and an assembly housing 63. The assembly housing 63 is installed on the valve body 10. The overflow valve core 61 is movably installed inside the assembly housing 63 and positioned at one end of the return oil passage 103 near the overflow passage 105. The two ends of the elastic element 62 are respectively connected to the inner walls of the overflow valve core 61 and the assembly housing 63. The portion of the valve body 10 located on the side of the overflow passage 105 near the return oil passage 103 forms an abutment ring wall 11 corresponding to the overflow valve core 61. When the oil pressure in the overflow passage 105 is lower than a predetermined pressure value, the overflow valve core 61 is held against the abutment ring wall 11 by the elastic force of the elastic element 62, thereby blocking the overflow passage 105 and preventing the hydraulic oil in the overflow passage 105 from being guided to the return oil passage 103. When the oil pressure in the overflow channel 105 is higher than a predetermined pressure value, the overflow valve core 61 can be pushed by hydraulic oil to separate from the abutment ring wall 11. At the same time, the elastic element 62 undergoes elastic deformation to open the overflow channel 105. At this time, the overflow channel 105 is connected to the return oil channel 103, and the hydraulic oil in the overflow channel 105 can be introduced into the return oil channel 103 to relieve pressure.

[0044] Preferably, with reference to the direction of the overflow valve core 61 away from the abutment ring wall 11, the cross-sectional dimension of the end of the overflow valve core 61 near the abutment ring wall 11 gradually increases. A cross-section is taken along the moving direction of the overflow valve core 61, and the cross-sectional lines on the same side of the end of the overflow valve core 61 near the abutment ring wall 11 extend and intersect. The overflow valve core 61 at least partially corresponds to and abuts against the abutment ring wall 11 with its peripheral wall at one end, thereby sealing the overflow channel 105, increasing the sealing performance, and improving the overflow response speed.

[0045] Preferably, the elastic element 62 is implemented as a spring.

[0046] Those skilled in the art should understand that the embodiments of this application described above and shown in the accompanying drawings are merely examples and do not limit the scope of this application. The advantages of this application have been fully and effectively implemented. The functional and structural principles of this application have been demonstrated and explained in the embodiments, and any variations or modifications can be made to the implementation of this application without departing from the stated principles.

Claims

1. A control valve assembly, characterized in that, The control valve assembly includes: The valve body includes a main flow channel, an oil inlet channel, a return channel, and a working channel. The main flow channel includes a connecting portion, an oil inlet portion, and an oil outlet portion. The two ends of the connecting portion extend in opposite directions to form the oil inlet portion and the oil outlet portion, respectively. The oil inlet portion is connected to the oil outlet portion through the connecting portion. The oil inlet channel is connected to the oil inlet portion. The return channel is connected to the oil outlet portion. The working channel is connected to the connecting portion. A main valve core is mounted on the valve body in a manner that allows it to be driven to move within the main channel; A flow control structure includes a conical wall assembly and a ring wall assembly. The conical wall assembly includes a first conical wall and a second conical wall. The ring wall assembly includes a first ring wall and a second ring wall. Either the first conical wall or the first ring wall is formed on the portion of the valve body located near the connecting portion of the oil inlet, and the other is formed on the main flow valve core. Either the second conical wall or the second ring wall is formed on the portion of the valve body located near the connecting portion of the oil outlet, and the other is formed on the main flow valve core. The first conical wall corresponds to the first ring wall, and the second conical wall corresponds to the... The second ring wall corresponds to the first ring wall and the second ring wall, which are both encircling the outer periphery of the main flow valve core and corresponding to the peripheral wall of the main flow valve core. A cross-section is made along the moving direction of the main flow valve core. The cross-section lines on the same side of the first ring wall and the first conical wall extend and intersect, and the cross-section lines on the same side of the second ring wall and the second conical wall extend and intersect. The main flow valve core moves in the main flow channel so that the first conical wall abuts against the first ring wall in a line contact manner or the second conical wall abuts against the second ring wall in a line contact manner, so as to isolate the oil inlet from the connecting part or the connecting part from the oil outlet.

2. The control valve assembly according to claim 1, characterized in that, Both the first conical wall and the second conical wall are formed on the main flow valve core. The first and second conical walls are respectively implemented as the inner walls of the oil inlet and the oil outlet. The length direction of the first and second conical walls is parallel to the moving direction of the main flow valve core. Taking the direction of extension from the oil inlet to the connecting part as a reference, the cross-sectional dimension of the portion of the main flow valve core forming the first conical wall gradually increases, and the cross-sectional dimension of the portion of the main flow valve core forming the second conical wall gradually decreases. When the main flow valve core moves and the first conical wall abuts against the first conical wall or the second conical wall abuts against the second conical wall, the portion of the main flow valve core forming the first conical wall is inserted into one end of the oil inlet near the connecting part, or the portion of the main flow valve core forming the second conical wall is inserted into one end of the oil outlet near the connecting part.

3. The control valve assembly according to claim 1, characterized in that, The control valve assembly includes at least one reset member connected to the main flow valve core. The reset member is configured to undergo elastic deformation when the main flow valve core is driven to move, and the reset member can reset the main flow valve core when it is not subjected to external force.

4. The control valve assembly according to claim 3, characterized in that, The control valve assembly further includes at least one control mechanism, which is installed on the valve body and corresponds to one end of the main valve core. The control mechanism is configured to drive the main valve core to move within the main channel.

5. The control valve assembly according to claim 4, characterized in that, Both the control mechanism and the reset member are provided. After the main valve core is moved by the control mechanism, the first conical wall separates from the first ring wall, and the second conical wall abuts against the second ring wall. At the same time, the reset member undergoes elastic deformation. When the force applied to the main valve core by the control mechanism is removed, the main valve core is reset by the elastic action of the reset member, so that the first conical wall abuts against the first ring wall, and the second conical wall separates from the second ring wall.

6. The control valve assembly according to claim 5, characterized in that, The main valve core includes a first valve core and a second valve core, wherein the first valve core extends from the oil inlet to the connecting portion, and the second valve core extends from the oil outlet to the connecting portion. The portion of the first valve core located in the connecting portion forms a first conical wall or a first ring wall, and the portion of the second valve core located in the connecting portion forms a second conical wall or a second ring wall. The reset member is connected to the second valve core, and the control mechanism is located on the side of the first valve core away from the second valve core. When the control mechanism drives the first valve core to move, the first valve core abuts against the second valve core and pushes the second valve core to move together. At the same time, the reset member undergoes elastic deformation. When the force applied to the first valve core by the control mechanism is removed, the second valve core resets under the elastic force of the reset member and pushes the first valve core to reset.

7. The control valve assembly according to any one of claims 4 to 6, characterized in that, The control mechanism includes a pushing assembly, which includes an armature and a pushing member. The pushing member is disposed between the armature and the main flow valve core. The control mechanism includes a coil and a mounting housing. The mounting housing is installed in the valve body. The coil is disposed inside the mounting housing. The armature is magnetically connected to the coil. The coil is configured to magnetize the armature and drive the armature to move in the direction extending from the oil inlet to the connecting portion, thereby pushing the pushing member to move synchronously. This causes the pushing member to push the main flow valve core to move within the main flow channel.

8. The control valve assembly according to claim 1, characterized in that, The control valve assembly further includes an overflow mechanism, and the valve body also has an overflow channel communicating with the connecting part. The overflow mechanism is installed on the valve body and is configured to detect the pressure of the hydraulic oil in the overflow channel and overflow by connecting the overflow channel and the return oil channel to control the pressure of the hydraulic oil in the working channel within a predetermined pressure range.

9. The control valve assembly according to claim 8, characterized in that, The overflow mechanism includes an overflow valve core, an elastic element, and an assembly housing. The assembly housing is installed on the valve body. The overflow valve core is movably installed inside the assembly housing and positioned at one end of the return oil channel near the overflow channel. The two ends of the elastic element are respectively connected to the overflow valve core and the inner wall of the assembly housing. The portion of the valve body located on the side of the overflow channel near the return oil channel forms an abutment ring wall corresponding to the overflow valve core. When the oil pressure in the overflow channel is lower than a predetermined pressure value, the overflow valve core can be held against the abutment ring wall by the elastic force of the elastic element. When the oil pressure in the overflow channel is higher than the predetermined pressure value, the overflow valve core can be pushed away from the abutment ring wall by hydraulic oil, and at the same time, the elastic element undergoes elastic deformation.

10. The control valve assembly according to claim 9, characterized in that, With reference to the direction of the overflow valve core away from the abutment ring wall, the cross-sectional dimension of the end of the overflow valve core near the abutment ring wall gradually increases. Taking a cross-section along the moving direction of the overflow valve core, the cross-sectional line of the abutment ring wall and the end of the overflow valve core near the abutment ring wall on the same side extends and intersects. The peripheral wall of one end of the overflow valve core corresponds at least partially to the abutment ring wall and abuts against the abutment ring wall in a line contact manner to seal the overflow channel.

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