One-way oil return valve structure, electromagnetic valve and hydraulic mechanism

Abstract

The invention relates to the technical field of valve bodies, in particular to a one-way oil return valve structure, an electromagnetic valve and a hydraulic mechanism, and the one-way oil return valve structure comprises a valve seat, a valve plate and an elastic piece. The valve seat comprises a disc body part and a sleeve part, the sleeve part penetrates through the assembly through hole of the disc body part, and the two ends of the sleeve part are open; the valve plate is arranged on the sleeve part in a sleeving mode and is in sliding fit with the sleeve part, when the valve plate is located at the closing position, the valve plate abuts against the disc body part and blocks the first oil liquid through hole, and when the valve plate is located at the conducting position, the valve plate is disengaged from the disc body part, and the first oil liquid through hole is opened; the elastic piece is used for driving the valve plate to move towards the closing position or tend to move towards the closing position. According to the one-way oil return valve structure, the valve plate can be switched to the conduction position from the closed position under the action of oil liquid, so that the oil liquid is discharged from the first oil liquid through hole, a one-way conduction channel is formed, obstruction of oil liquid circulation is reduced, and when the one-way oil return valve structure is applied to an electromagnetic valve, the oil liquid circulation efficiency of the electromagnetic valve can be improved.

Description

Technical Field

[0001] This application relates to the technical field of valve bodies, and more specifically, to a one-way oil return valve structure, a solenoid valve, and a hydraulic mechanism. Background Art

[0002] As a component of a vehicle suspension system, the core function of an electronically controlled shock absorber is to optimize the vehicle's handling and comfort by adjusting the damping force. In the prior art, an electronically controlled shock absorber typically consists of key components such as a working cylinder, a piston, and a solenoid valve. The solenoid valve is responsible for controlling the flow path and flow rate of the oil, thereby achieving the adjustment of the damping force.

[0003] During the rebound stroke of the shock absorber, the oil enters the intermediate cylinder through the small holes in the working cylinder. During the compression stroke, the oil mainly returns to the working cylinder through the flow holes on the side of the solenoid valve. However, due to the restricted flow path of the oil during the compression stroke, the oil return amount is small, and complete blockage may even occur. This design defect not only affects the normal operation of the shock absorber but may also cause the system to operate smoothly or result in an idle stroke phenomenon. Summary of the Invention

[0004] The purpose of this application is to provide a one-way oil return valve structure, a solenoid valve, and a hydraulic mechanism. The one-way oil return valve structure improves the smoothness of the oil circuit operation and reduces the idle stroke phenomenon.

[0005] To achieve the above purpose, in the first aspect, this application provides a one-way oil return valve structure, including:

[0006] A valve seat, the valve seat includes a disc portion and a sleeve portion. An assembly through-hole and a first oil passage hole are axially provided in the middle of the disc portion. The sleeve portion is inserted through the assembly through-hole of the disc portion, and both ends of the sleeve portion are open.

[0007] A valve plate, the valve plate is sleeved on the sleeve portion and is slidably engaged with the sleeve portion. The valve plate has a closed position and a conducting position on the sleeve portion. In the closed position, the valve plate abuts against the disc portion and blocks the first oil passage hole. In the conducting position, the valve plate is disengaged from the disc portion and the first oil passage hole is opened.

[0008] An elastic member, the elastic member is used to drive the valve plate to move towards the closed position or has a tendency to move towards the closed position.

[0009] In an alternative embodiment, it further includes:

[0010] A valve sleeve, the valve sleeve is sleeved on the disc portion, and the circumferential surface of the disc portion that cooperates with the valve sleeve is a first stepped surface.

[0011] In an alternative embodiment, a second stepped surface is provided on the inner wall of the valve sleeve. When the valve plate reaches the limit stroke at the conducting position, it abuts against the second stepped surface, and the second stepped surface is used to limit the displacement of the valve plate.

[0012] In an alternative embodiment, the elastic member is a conical spring. The two ends of the conical spring are respectively a first end and a second end, and the diameter of the first end is smaller than that of the second end.

[0013] A ring groove is provided on the end of the sleeve portion. The first end is clamped in the ring groove of the sleeve portion. The inner wall of the ring groove limits the displacement of the first end, and the second end abuts against the valve plate.

[0014] In an alternative embodiment, at the end of the sleeve portion on the same side as the valve plate in the disc portion, a second hydraulic fluid through hole is radially provided, and a plurality of second hydraulic fluid through holes are equidistantly arranged around the circumference of the sleeve portion.

[0015] In an alternative embodiment, the valve plate includes an annular body portion and a support portion. The annular body portion is sleeved on the sleeve portion and there is a gap between the annular body portion and the sleeve portion. One end of the support portion is in sliding fit with the sleeve portion, and the other end of the support portion is connected to the annular body portion. A plurality of support portions are equidistantly arranged around the circumference of the annular body portion, and adjacent support portions are spaced apart.

[0016] In an alternative embodiment, a first support ring body and a second support ring body are provided on the end surface of the disc portion close to the valve plate. The first support ring body and the second support ring body are spaced apart. The diameter of the first support ring body is larger than that of the second support ring body. The first hydraulic fluid through hole is located between the first support ring body and the second support ring body. When the valve plate is in the closed position, it abuts against the first support ring body and the second support ring body.

[0017] In an alternative embodiment, an annular sealing groove is provided on the end surface of the disc portion away from the valve plate.

[0018] In a second aspect, the present application provides a solenoid valve, including:

[0019] A main valve body having a first hydraulic fluid port;

[0020] The one-way oil return valve structure according to any one of the foregoing embodiments is provided at the first hydraulic fluid port.

[0021] In a third aspect, the present application provides a hydraulic mechanism, including:

[0022] The solenoid valve according to the foregoing embodiment.

[0023] In the present application, in the one-way oil return valve structure, the valve plate can be switched from the closed position to the conducting position under the action of the oil fluid, enabling the oil fluid to be discharged from the first oil fluid through hole, forming a one-way conducting channel, reducing the obstruction of the oil fluid flow. When it is applied to a solenoid valve, during the compression process of the piston rod, the oil return efficiency of the solenoid valve can be improved.

[0024] Since the one-way oil return valve structure can improve the oil fluid flow efficiency of the solenoid valve, when the solenoid valve is applied to a hydraulic mechanism, the oil return amount of the hydraulic mechanism can be increased, thereby improving the running smoothness of the hydraulic mechanism.

[0025] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 An exploded view of one perspective of an embodiment of a one-way oil return valve structure provided by the present application;

[0028] Figure 2 An exploded view of another perspective of an embodiment of a one-way oil return valve structure provided by the present application;

[0029] Figure 3 An assembled schematic diagram of another perspective of an embodiment of a one-way oil return valve structure provided by the present application;

[0030] Figure 4 For Figure 3 The cross-sectional view in the A-A direction;

[0031] Figure 5 A cross-sectional view of another perspective of an embodiment of a hydraulic mechanism provided by the present application;

[0032] Figure 6 A schematic diagram of one working state of an embodiment of a hydraulic mechanism provided by the present application;

[0033] Figure 7 A schematic diagram of another working state of an embodiment of a hydraulic mechanism provided by the present application.

[0034] Description of the reference numerals:

[0035] 1000 - One - way oil - return valve structure;

[0036] 100 - Valve seat; 110 - Disc body part; 112 - First stepped surface; 120 - Sleeve part; 122 - First oil - passage hole; 124 - Ring groove; 126 - First support ring body; 128 - Second support ring body; 129 - Annular sealing groove;

[0037] 200 - Valve plate; 210 - Ring part; 220 - Support part;

[0038] 300 - Elastic part;

[0039] 400 - Valve sleeve; 410 - Second stepped surface;

[0040] 2000 - Electromagnetic valve; 2100 - Main valve body;

[0041] 3000 - Hydraulic mechanism; 3100 - Working cylinder; 3200 - Oil storage cylinder; 3300 - Intermediate cylinder; 3400 - Piston rod. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0043] In the description of this application, it should be noted that the orientation or positional relationships indicated by terms such as "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of this application are usually placed during use. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0044] In the description of this application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0045] Embodiments of the present application provide a one-way oil return valve structure 1000, a solenoid valve 2000, and a hydraulic mechanism 3000. The one-way oil return valve structure 1000 can be applied to the solenoid valve 2000, and during the compression of the piston rod, it can improve the oil return efficiency of the solenoid valve. The solenoid valve 2000 can be applied to the hydraulic mechanism 3000, and the solenoid valve 2000 can increase the oil return volume of the hydraulic mechanism 3000 and improve the operation smoothness.

[0046] As Figures 1 to 4 shown, in a first aspect, embodiments of the present application provide a one-way oil return valve structure 1000, including a valve seat 100, a valve plate 200, and an elastic member 300.

[0047] As Figure 1 and Figure 2 shown, the valve seat 100 includes a disc portion 110 and a sleeve portion 120. An assembly through hole and a first oil passage hole 122 are axially provided in the middle of the disc portion 110. Exemplarily, the axis of the assembly through hole coincides with the axis of the disc portion 110, and the axis of the first oil passage hole 122 is parallel to the axis of the disc portion 110 and has a certain distance.

[0048] As Figure 1 and Figure 2 shown, the sleeve portion 120 is inserted through the assembly through hole of the disc portion 110. Both ends of the sleeve portion 120 are open, and the sleeve portion 120 is hollow. The hollow structure of the sleeve portion 120 is used for passing oil. Exemplarily, the disc portion 110 and the sleeve portion 120 are integrally formed, welded, or connected by clamping.

[0049] As Figures 2 to 4 shown, the valve plate 200 is sleeved on the sleeve portion 120 and is slidably matched with the sleeve portion 120. The valve plate 200 has a closed position and a conducting position on the sleeve portion 120; in the closed position, the valve plate 200 abuts against the disc portion 110 and blocks the first oil passage hole 122; in the conducting position, the valve plate 200 is disengaged from the disc portion 110 and the first oil passage hole 122 is opened.

[0050] Exemplarily, initially, the valve plate 200 is in the closed position. When the hydraulic fluid flows from the first hydraulic fluid through-hole 122 towards the valve plate 200, the hydraulic fluid can push the valve plate 200 to move away from the disc body portion 110, causing the valve plate 200 to switch from the closed position to the conducting position, so that the hydraulic fluid is discharged from the first hydraulic fluid through-hole 122 to the side of the disc body portion 110 where the valve plate 200 is located; if the hydraulic fluid impacts the valve plate 200 from the side of the disc body portion 110 where the valve plate 200 is located, it will push the valve plate 200 towards the first hydraulic fluid through-hole 122 near the disc body portion 110, and the valve plate 200 is in the closed position, so that the valve plate 200 further blocks the first hydraulic fluid through-hole 122. Therefore, the valve plate 200 can enable the hydraulic fluid to form a unidirectional conducting channel in the first hydraulic fluid through-hole 122. Moreover, the disc body portion 110 is hollow and both ends are open, and the hollow structure of the disc body portion 110 provides a two-way channel.

[0051] The elastic member 300 can expand and contract and rebound. The elastic member 300 is used to drive the valve plate 200 to move towards the closed position or have a tendency to move towards the closed position.

[0052] Exemplarily, the elastic member 300 is in a compressed state. One end of the elastic member 300 is fixedly arranged, and the other end of the elastic member 300 abuts against the valve plate 200, so that the elastic member 300 pushes the valve plate 200 to move towards the closed position or has a tendency to move towards the closed position, ensuring that the valve plate 200 can automatically return to the closed position after the action of the hydraulic fluid disappears and realizing the unidirectional conducting function.

[0053] Exemplarily, a plurality of first hydraulic fluid through-holes 122 are arranged circumferentially around the disc body portion 110, which is beneficial for the hydraulic fluid to enter and exit at different positions and improves the flow capacity of the hydraulic fluid; the disc body portion 110 is hollow and both ends are open, providing a two-way channel and further increasing the flexibility of the hydraulic fluid flow.

[0054] As Figures 2 to 4 shown, in one embodiment, the one-way oil return valve structure 1000 further includes a valve sleeve 400. The valve sleeve 400 is sleeved on the disc body portion 110, and the circumferential surface of the disc body portion 110 that cooperates with the valve sleeve 400 is the first stepped surface 112.

[0055] Exemplarily, the valve sleeve 400 is in interference fit with the first stepped surface 112 of the disc body portion 110, so that the valve sleeve 400 is fixedly connected to the disc body portion 110. In another embodiment, the valve sleeve 400 is snap-connected to the first stepped surface 112 of the disc body portion 110. In another embodiment, the valve sleeve 400 is in threaded cooperation with the disc body portion 110. Internal threads are provided on the inner wall of the valve sleeve 400, and external threads that cooperate with the internal threads on the valve sleeve 400 are provided on the first stepped surface 112 of the disc body portion 110.

[0056] Exemplarily, one end of the valve sleeve 400 is open and the other end is closed. An oil passage is provided at the closed end of the valve sleeve 400. The disc portion 110 is fixedly arranged at the opening of the valve sleeve 400. As Figure 4 shown, the inner wall chamber of the valve sleeve 400 and the disc portion 110 form the inner chamber of the one-way oil return valve structure 1000.

[0057] Exemplarily, there is a gap allowing oil to pass through between the inner wall at the end of the valve sleeve 400 where the oil passage is provided and the sleeve portion 120. However, in another embodiment, the sleeve portion 120 abuts against the end face at the oil passage of the valve sleeve 400.

[0058] As Figure 4 shown, in one embodiment, a second stepped surface 410 is provided on the inner wall of the valve sleeve 400. When the valve plate 200 reaches the limit stroke of the conducting position, it abuts against the second stepped surface 410, and the second stepped surface 410 is used to limit the displacement of the valve plate 200.

[0059] The second stepped surface 410 directly restricts the displacement of the valve plate 200 through physical contact, preventing it from continuing to move due to inertia or pressure fluctuations under high pressure or abnormal working conditions, and avoiding the valve plate 200 from being stuck obliquely at the sleeve portion 120 due to excessive opening, resulting in abnormal return.

[0060] The second stepped surface 410 serves as a stress point, which can disperse the impact force generated by the impact of the valve plate 200, avoiding deformation of the valve plate 200 or wear of the inner wall of the valve sleeve 400 caused by local stress concentration, and extending the service life of the components.

[0061] As Figure 1 and Figure 2 shown, in one embodiment, the elastic member 300 is a conical spring. The two ends of the conical spring are respectively a first end and a second end, and the diameter of the first end is smaller than that of the second end.

[0062] A ring groove 124 is provided at the end of the sleeve portion 120. The first end is clamped in the ring groove 124 of the sleeve portion 120. The inner wall of the ring groove 124 limits the displacement of the first end, so that the first end is fixedly arranged at the ring groove 124 of the sleeve portion 120, and the second end abuts against the valve plate 200.

[0063] Compared with a cylindrical spring, the conical spring has a larger compression stroke, but occupies less space and has a lighter self-weight; under the condition of the same axial length, when compressed to the limit, the length of the cylindrical spring is greater than that of the conical spring. Therefore, the conical spring adopted in this application can increase the stroke distance of the valve plate 200, improve the opening degree of the valve plate 200, increase the flow area of the valve port, and significantly enhance the flow control ability. A longer stroke allows the valve plate 200 to be fully opened under high pressure, avoiding the valve port from closing due to insufficient spring compression and ensuring the stability of the system in a high-pressure environment.

[0064] The arc-shaped structure design of the conical spring enables it to have a smaller volume and lighter weight compared to other springs of the same mass under the same load and operating frequency conditions, effectively saving space and cost. When the one-way oil return valve structure is applied to the solenoid valve, it can save the volume of the solenoid valve. The spring stiffness of the conical spring can gradually decrease with the load, and its working performance can be adaptively adjusted with the change of the load, so as to effectively reduce the impact and vibration caused by the load change, and thus can effectively eliminate the load fluctuation caused by the impact and vibration, enabling the solenoid valve to maintain a stable operating state and improving the performance and reliability of the solenoid valve.

[0065] When the conical spring is compressed to the limit, its axial length is shorter (compared with the cylindrical spring), which can effectively reduce the overall height of the valve body and is especially suitable for hydraulic systems with limited installation space (such as the miniaturized solenoid valve 2000).

[0066] As Figures 1 to 4 shown, in one embodiment, at the end of the sleeve portion 120 on the same side as the valve plate 200 in the disk body portion 110, a second oil passage hole is radially opened; when the valve plate 200 is in the conducting position, even if it is not completely at the limit position of the conducting position (the position where the valve plate 200 abuts against the second stepped surface 410 of the valve sleeve 400), the oil can enter the sleeve portion 120 from the second oil passage hole, improving the oil flow efficiency and significantly shortening the response time.

[0067] The traditional structure requires the valve plate 200 to be fully opened to achieve the maximum flow rate, while in this design, a relatively high flow rate can be achieved at a partially conducting position through the second oil passage hole, expanding the adjustment range of the valve plate 200.

[0068] As Figure 1 shown, a plurality of second oil passage holes are equidistantly arranged circumferentially around the sleeve portion 120, enabling the oil to enter the sleeve portion 120 uniformly from different directions, avoiding pressure loss and cavitation phenomena caused by too high local flow velocity and improving the stability of the flow field. The equidistant distribution of the plurality of second oil passage holes can disperse the oil impact force, avoid pressure fluctuations caused by single-hole flow, and improve the system stability. Even if the valve plate 200 is stuck at a partially conducting position due to impurities or foreign objects, the second oil passage hole can still ensure the basic flow rate, avoid the complete failure of the system, and improve the system fault tolerance.

[0069] As Figure 1 shown, in one embodiment, the valve plate 200 includes an annular body portion 210 and a support portion 220. The annular body portion 210 is sleeved on the sleeve portion 120 and there is a gap between the annular body portion 210 and the sleeve portion 120, and the adjacent support portions 220 are arranged at intervals.

[0070] One end of the support portion 220 is in sliding fit with the sleeve portion 120, and the other end of the support portion 220 is connected to the ring body portion 210. A plurality of support portions 220 are circumferentially and equidistantly arranged around the ring body portion 210.

[0071] Exemplarily, the support portion 220 and the ring body portion 210 are arranged by welding or integrally forming.

[0072] By the support portion 220 abutting against the outer wall of the sleeve portion 120, the radial displacement of the ring body portion 210 can be restricted, so that when the ring body portion 210 is switched from the conducting position to the closed position, the first oil passage hole 122 can be accurately blocked, ensuring the sealing performance of the valve plate 200 in the closed position.

[0073] The adjacent support portions 220 are arranged at intervals, which can reduce the contact area with the sleeve portion 120, reduce the friction force between the support portion 220 and the sleeve portion 120, and reduce the wear between the support portion 220 and the sleeve portion 120.

[0074] Moreover, when in the conducting position, the gap between the adjacent support portions 220 allows the oil fluid to pass through, further improving the oil fluid circulation efficiency.

[0075] As Figure 1 shown, in one embodiment, a first support ring body 126 and a second support ring body 128 are arranged on the end face of the disc body portion 110 close to the valve plate 200.

[0076] The first support ring body 126 and the second support ring body 128 are arranged at intervals. The diameter of the first support ring body 126 is larger than the diameter of the second support ring body 128. The first oil passage hole 122 is located between the first support ring body 126 and the second support ring body 128. When the valve plate 200 is in the closed position, the ring body portion 210 abuts against the first support ring body 126 and the second support ring body 128.

[0077] The first support ring body 126 and the second support ring body 128 abut against the ring body portion 210. This arrangement reduces the contact area with the ring body portion 210, prevents excessive gaps due to insufficient flatness of the ring body portion 210 and the disc body portion 110, avoids the occurrence of leakage, and ensures the sealing performance of the valve plate 200 in the closed position.

[0078] As Figure 4 shown, in one embodiment, an annular sealing groove 129 is arranged on the end face of the disc body portion 110 far from the valve plate 200. A sealing ring is arranged in the annular sealing groove 129.

[0079] In a second aspect, an embodiment of the present application provides a solenoid valve 2000, including a main valve body 2100 and a one-way oil return valve structure 1000 as in any of the above embodiments.

[0080] The main valve body 2100 has a first oil port.

[0081] The one-way oil return valve structure 1000 is arranged at the first oil port.

[0082] As Figures 5 to 7 shown, in a third aspect, an embodiment of the present application provides a hydraulic mechanism 3000, including a working cylinder 3100, an oil storage cylinder 3200, an intermediate cylinder 3300, and a solenoid valve 2000 as described in the above embodiment.

[0083] Figure 6 Shown is a schematic diagram of the oil flow when the working cylinder 3100 contracts. Figure 7 Shown is a schematic diagram of the oil flow when the working cylinder 3100 extends.

[0084] A piston rod 3400 is slidably and sealingly installed in the working cylinder 3100. The piston rod 3400 divides the working cylinder 3100 into a first working chamber and a second working chamber. When the piston rod 3400 extends out of the working cylinder 3100, the first working chamber is compressed. When the piston rod 3400 retracts into the working cylinder 3100, the second working chamber is compressed. The first working chamber of the working cylinder 3100 communicates with the intermediate cylinder 3300, and the second working chamber of the working cylinder 3100 communicates with the oil storage cylinder 3200. One end of the sleeve portion 120 of the one-way oil return valve structure 1000 communicates with the intermediate cylinder 3300, and the other end of the sleeve portion 120 is located inside the valve sleeve 400. At the same time, the valve sleeve 400 communicates with the first oil port on the main valve body 2100 of the solenoid valve 2000, and a circulation through hole for communicating with the oil storage cylinder 3200 is also provided on the main valve body 2100.

[0085] When the valve plate 200 is in the conducting position, one end of the first oil through hole 122 on the disc portion 110 communicates with the inner chamber of the valve sleeve 400, and the other end of the disc portion 110 communicates with the oil storage cylinder 3200.

[0086] A valve piece is arranged in the solenoid valve 2000. Oil can enter the first oil through hole 122 from the valve sleeve 400. The oil enters the main valve body 2100 from the first oil through hole 122. The oil in the main valve body 2100 can flow from the valve piece to the circulation through hole, and then the oil is discharged from the circulation through hole to the oil storage cylinder 3200. The valve piece can block the oil at the circulation through hole from flowing from the valve piece to the first oil port.

[0087] As Figure 6As shown, when the piston rod 3400 retracts into the working cylinder 3100, the piston rod 3400 compresses the volume of the second working chamber, and the volume of the first working chamber increases; the hydraulic fluid in the second working chamber is compressed and then enters the oil storage cylinder 3200. The hydraulic fluid in the oil storage cylinder 3200 enters the first hydraulic fluid through-hole 122 of the disc portion 110, and the hydraulic fluid in the first hydraulic fluid through-hole 122 pushes the valve plate 200 to the conducting position. The hydraulic fluid enters the chamber of the valve sleeve 400 from the first hydraulic fluid through-hole 122, and the hydraulic fluid in the valve sleeve 400 enters the intermediate cylinder 3300 from the sleeve portion 120. The volume of the first working chamber increases, and the hydraulic fluid in the intermediate cylinder 3300 enters the first working chamber. The liquid in the oil storage cylinder 3200 not only enters the valve sleeve 400 from the first hydraulic fluid through-hole 122, but also enters the main valve body 2100 from the circulation through-hole of the main valve body 2100. After the hydraulic fluid enters the main valve body 2100, it pushes the valve piece in the main valve body 2100, and the valve piece blocks the hydraulic fluid from flowing from the circulation through-hole to the first hydraulic fluid port. The valve piece is pushed by the hydraulic fluid at the circulation through-hole, so that the valve piece also blocks the hydraulic fluid flowing from the first hydraulic fluid port through the valve piece to the conducting through-hole.

[0088] As Figure 7 shown, when the piston rod 3400 extends from the working cylinder 3100, the volume of the first working chamber is compressed and reduced by the piston rod 3400, and the volume of the second working chamber increases; the hydraulic fluid in the first working chamber is squeezed and enters the intermediate cylinder 3300. The hydraulic fluid in the intermediate cylinder 3300 enters the valve sleeve 400 from the sleeve portion 120 of the valve seat 100. The hydraulic fluid in the valve sleeve 400 enters the main valve body 2100 from the first hydraulic fluid port, and the hydraulic fluid in the main valve body 2100 enters the oil storage cylinder 3200 from the circulation through-hole. The volume of the second working chamber increases, and the hydraulic fluid in the oil storage cylinder 3200 enters the second working chamber to fill the second working chamber.

[0089] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0090] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A one-way oil return valve structure, characterized in that: include: A valve seat (100), the valve seat (100) comprising a disc body (110) and a sleeve (120), a mounting through hole and a first oil through hole (122) being arranged in the middle of the disc body (110) along the axis, the sleeve (120) being inserted through the mounting through hole of the disc body (110), and both ends of the sleeve (120) being openings; a valve plate (200), the valve plate (200) being sleeved on the sleeve portion (120) and slidably matched with the sleeve portion (120), the valve plate (200) having a closed position and a conducting position on the sleeve portion (120), wherein in the closed position, the valve plate (200) abuts against the disc body portion (110) and blocks the first oil through hole (122), and in the conducting position, the valve plate (200) is out of contact with the disc body portion (110) and the first oil through hole (122) is opened; An elastic member (300), wherein the elastic member (300) is used to drive the valve plate (200) to move toward the closed position or to have a tendency to move toward the closed position.

2. The one-way oil return valve structure according to claim 1 is characterized in that: Also includes: A valve sleeve (400) is sleeved on the disc body (110), and a peripheral surface on the disc body (110) that matches the valve sleeve (400) is a first step surface (112).

3. The one-way oil return valve structure according to claim 2 is characterized in that: The inner wall of the valve sleeve (400) is provided with a second step surface (410), and the valve plate (200) abuts against the second step surface (410) when reaching the limit stroke of the conduction position, and the second step surface (410) is used to limit the displacement of the valve plate (200).

4. The one-way oil return valve structure according to claim 1 is characterized in that: The elastic member (300) is a conical spring, the two ends of the conical spring are respectively a first end and a second end, and the diameter of the first end is smaller than the diameter of the second end; An annular groove (124) is provided on the end of the sleeve portion (120), the first end portion is clamped in the annular groove (124) of the sleeve portion (120), the inner wall of the annular groove (124) limits the displacement of the first end portion, and the second end portion abuts against the valve plate (200).

5. The one-way oil return valve structure according to claim 1 is characterized in that: The sleeve portion (120) is provided with a second oil through hole in a radial direction at an end portion thereof which is located on the same side of the disc body portion (110) as the valve plate (200), and a plurality of the second oil through holes are arranged at equal intervals around the circumference of the sleeve portion (120).

6. The one-way oil return valve structure according to claim 1, characterized in that: The valve plate (200) includes a ring body portion (210) and a support portion (220), wherein the ring body portion (210) is sleeved on the sleeve portion (120) with a gap between the ring body portion (210) and the sleeve portion (120), one end of the support portion (220) is slidably fitted with the sleeve portion (120), and the other end of the support portion (220) is connected to the ring body portion (210), and a plurality of support portions (220) are equidistantly arranged around the ring body portion (210), and adjacent support portions (220) are spaced apart.

7. The one-way oil return valve structure according to claim 1, characterized in that: A first supporting ring body (126) and a second supporting ring body (128) are arranged on the end surface of the disc body (110) close to the valve plate (200); the first supporting ring body (126) and the second supporting ring body (128) are arranged at an interval; the diameter of the first supporting ring body (126) is larger than the diameter of the second supporting ring body (128); the first oil through hole (122) is located between the first supporting ring body (126) and the second supporting ring body (128); and the valve plate (200) abuts against the first supporting ring body (126) and the second supporting ring body (128) when the valve plate (200) is located in the closed position.

8. The one-way oil return valve structure according to claim 1, characterized in that: An annular sealing groove (129) is provided on the end surface of the disc body (110) away from the valve plate (200).

9. A solenoid valve, characterized in that: include: A main valve body (2100), wherein the main valve body (2100) has a first oil port; The one-way oil return valve structure (1000) according to any one of claims 1 to 8, wherein the one-way oil return valve structure (1000) is arranged at the first oil port.

10. A hydraulic mechanism, characterized in that: include: The solenoid valve (2000) as claimed in claim 9.

Images