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

Abstract

The utility model 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] The application 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. BACKGROUND

[0002] An electronically controlled shock absorber is a component of a vehicle suspension system, and its core function is to optimize the handling and comfort of the vehicle by adjusting the damping force. In the prior art, an electronically controlled shock absorber is usually composed of a working cylinder, a piston, an electromagnetic valve and other key components, wherein the electromagnetic valve is responsible for controlling the flow path and flow of oil, thereby achieving adjustment of the damping force.

[0003] During the rebound stroke of the shock absorber, oil enters the intermediate cylinder through the small hole of the working cylinder, and during the compression stroke, the oil mainly returns to the working cylinder through the flow-through hole on the side of the electromagnetic valve. However, due to the limited flow path of the oil during the compression stroke, the amount of oil return is small, and even complete blockage may occur. This design defect not only affects the normal operation of the shock absorber, but also may cause the system to run poorly or even cause the idle stroke phenomenon. CONTENT OF THE INVENTION

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

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present application provides a one-way oil return valve structure, comprising:

[0006] a valve seat, the valve seat comprising a disc body part and a sleeve part, the disc body part having a fitting through hole and a first oil liquid through hole arranged in the middle along the axis, the sleeve part being arranged through the fitting through hole of the disc body part, and the two ends of the sleeve part being open;

[0007] a valve plate, the valve plate being sleeved on the sleeve part and being in sliding cooperation with the sleeve part, the valve plate having a closed position and an open position on the sleeve part, when in the closed position, the valve plate abuts against the disc body part and blocks the first oil liquid through hole, and when in the open position, the valve plate is out of contact with the disc body part and the first oil liquid through hole is open;

[0008] a resilient member, the resilient member being used to drive the valve plate to move towards the closed position or having a tendency to move towards the closed position.

[0009] In an optional embodiment, further comprising:

[0010] a valve sleeve, the valve sleeve being sleeved on the disc body part, and the circumferential surface of the disc body part cooperating with the valve sleeve being a first stepped surface.

[0011] In an optional embodiment, an inner wall of the valve sleeve is provided with a second stepped surface, the valve plate abuts against the second stepped surface when reaching the limit stroke of the open position, and the second stepped surface is used to limit the displacement of the valve plate.

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

[0013] An end of the sleeve portion is provided with a ring groove, the first end is clamped in the ring groove of the sleeve portion, an 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 optional embodiment, the sleeve portion is provided with a second oil passage hole at an end thereof on the same side as the valve plate and the disc portion in the radial direction, and a plurality of second oil passage holes are equidistantly arranged around the circumference of the sleeve portion.

[0015] In an optional embodiment, the valve plate comprises a ring body portion and a support portion, the ring body portion is sleeved on the sleeve portion and has a gap with the sleeve portion, one end of the support portion is in sliding fit with the sleeve portion, the other end of the support portion is connected to the ring body portion, a plurality of support portions are equidistantly arranged around the circumference of the ring body portion, and adjacent support portions are spaced apart.

[0016] In an optional embodiment, the disc portion is provided with a first support ring body and a second support ring body on an end face thereof close to the valve plate, the first support ring body and the second support ring body are spaced apart, a diameter of the first support ring body is greater than a diameter of the second support ring body, the first oil passage hole is located between the first support ring body and the second support ring body, and the valve plate abuts against the first support ring body and the second support ring body when being in the closed position.

[0017] In an optional embodiment, an annular sealing groove is arranged on an end face of the disc portion away from the valve plate.

[0018] In a second aspect, the application provides an electromagnetic valve, comprising:

[0019] A main valve body, the main valve body has a first oil port;

[0020] The one-way oil return valve structure according to any one of the preceding embodiments is arranged at the first oil port.

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

[0022] The electromagnetic valve according to the preceding embodiments.

[0023] In the application, the valve plate in the one-way oil return valve structure can be switched from the closed position to the open position under the action of oil, so that the oil is discharged from the first oil passage, a one-way open channel is formed, and the obstruction of oil flow is reduced. When it is applied to a solenoid valve, the oil return efficiency of the solenoid valve can be improved during the compression of the piston rod.

[0024] Since the one-way oil return valve structure can improve the oil 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, and the operation fluency of the hydraulic mechanism is improved.

[0025] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 An explosion view of one of the embodiments of the one-way oil return valve structure provided by the application from one perspective;

[0028] Figure 2 An explosion view of one of the embodiments of the one-way oil return valve structure provided by the application from two perspectives;

[0029] Figure 3 An assembly schematic view of one of the embodiments of the one-way oil return valve structure provided by the application from two perspectives;

[0030] Figure 4 A sectional view in the direction of A-A in the figure; Figure 3

[0031] Figure 5 A sectional view of one of the embodiments of the hydraulic mechanism provided by the application from two perspectives;

[0032] Figure 6 A schematic view of one of the working states of one of the embodiments of the hydraulic mechanism provided by the application;

[0033] Figure 7 Another schematic view of the working state of one of the embodiments of the hydraulic mechanism provided by the application.

[0034] Explanation of reference signs:

[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 body part; 220 - support part

[0038] 300 - elastic member

[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 DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0043] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms “inner”, “outer” and the like are based on the positions or location relationships shown in the drawings, or the positions or location relationships in which the products of the present application are usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms “first”, “second” and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “provided”, “connected” should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The embodiment of the present application provides a one-way oil return valve structure 1000, an electromagnetic valve 2000 and a hydraulic mechanism 3000, the one-way oil return valve structure 1000 can be applied to the electromagnetic valve 2000, the oil return efficiency of the electromagnetic valve can be improved in the piston rod compression process, the electromagnetic valve 2000 can be applied to the hydraulic mechanism 3000, the electromagnetic valve 2000 can increase the oil return amount of the hydraulic mechanism 3000, and the operation fluency is improved.

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

[0047] As shown in Figure 1 and Figure 2 , the valve seat 100 comprises a disc body part 110 and a sleeve part 120, the disc body part 110 is provided with an assembly through hole and a first oil liquid through hole 122 in the middle along the axis, and the axis of the assembly through hole coincides with the axis of the disc body part 110, and the axis of the first oil liquid through hole 122 is parallel to the axis of the disc body part 110 and there is a certain distance.

[0048] As shown in Figure 1 and Figure 2 , the sleeve part 120 is arranged at the assembly through hole of the disc body part 110, both ends of the sleeve part 120 are open, and the sleeve part 120 is hollow, and the hollow structure of the sleeve part 120 is used for passing oil liquid. The disc body part 110 and the sleeve part 120 are integrally formed, welded or clamped and connected.

[0049] As shown in Figures 2 to 4 , the valve plate 200 is sleeved on the sleeve part 120 and is in sliding fit with the sleeve part 120, and the valve plate 200 has a closed position and a through position on the sleeve part 120; when in the closed position, the valve plate 200 abuts against the disc body part 110 and blocks the first oil liquid through hole 122; when in the through position, the valve plate 200 is out of contact with the disc body part 110 and the first oil liquid through hole 122 is opened.

[0050] Exemplarily, initially, the valve plate 200 is in the closed position, when the oil flows from the first oil passage hole 122 to the valve plate 200, the oil can push the valve plate 200 to move away from the disc body part 110, so that the valve plate 200 is switched from the closed position to the open position, so that the oil is discharged from the first oil passage hole 122 to the side of the disc body part 110 with the valve plate 200; if the oil impacts the valve plate 200 from the side of the disc body part 110 with the valve plate 200, the valve plate 200 will be pushed to move close to the first oil passage hole 122 of the disc body part 110, and the valve plate 200 is in the closed position, so that the valve plate 200 further blocks the first oil passage hole 122, so that the valve plate 200 can form a one-way channel for the oil in the first oil passage hole 122. Moreover, the disc body part 110 is hollow and both ends are open, and the hollow structure of the disc body part 110 provides a two-way channel.

[0051] The elastic member 300 can stretch and rebound. The elastic member 300 is used to drive the valve plate 200 to move to the closed position or have a tendency to move to 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 to the closed position or has a tendency to move to the closed position, so as to ensure that the valve plate 200 can automatically return to the closed position after the action of the oil disappears, and realize the one-way conduction function.

[0053] Exemplarily, the first oil passage hole 122 is arranged in plurality around the circumference of the disc body part 110, which is beneficial to the oil to enter and exit at different positions, and improves the flow capacity of the oil; the disc body part 110 is hollow and both ends are open, which provides a two-way channel and further increases the flexibility of the oil flow.

[0054] As shown in Figures 2 to 4 In one embodiment, the one-way oil return valve structure 1000 further comprises a valve sleeve 400, the valve sleeve 400 is sleeved on the disc body part 110, and the circumferential surface of the disc body part 110 matched 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 part 110, so that the valve sleeve 400 is fixedly connected with the disc body part 110. In another embodiment, the valve sleeve 400 is clamped with the first stepped surface 112 of the disc body part 110. In another embodiment, the valve sleeve 400 is in threaded fit with the disc body part 110, the inner wall of the valve sleeve 400 is provided with internal threads, and the first stepped surface 112 of the disc body part 110 is provided with external threads matched with the internal threads of the valve sleeve 400.

[0056] Exemplarily, one end of the valve sleeve 400 is open and the other end is closed, and an oil passage is formed on the closed end of the valve sleeve 400. The disc body part 110 is fixedly arranged at the open end of the valve sleeve 400. As shown in Figure 4 The inner wall cavity of the valve sleeve 400 and the disc body part 110 form an internal cavity of the one-way oil return valve structure 1000.

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

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

[0059] The second stepped surface 410 directly limits 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, avoiding the valve plate 200 from being obliquely clamped at the sleeve part 120 due to excessive opening, and causing the valve plate 200 to fail to normally return.

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

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

[0062] The end of the sleeve part 120 is provided with a ring groove 124, the first end is clamped in the ring groove 124 of the sleeve part 120, and 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 part 120, and the second end abuts against the valve plate 200.

[0063] Compared with a cylindrical spring, the compression stroke of the conical spring is larger, but the occupied space is smaller, and the self-weight is lighter. Under the same axial length condition, when compressed to the limit, the length of the cylindrical spring is greater than that of the conical spring. Therefore, the use of the conical spring can increase the stroke distance of the valve plate 200, improve the opening degree of the valve plate 200, increase the valve port flow area, and significantly improve the flow control capability. The longer stroke allows the valve plate 200 to be fully opened under high pressure, avoids the valve port from being closed due to insufficient spring compression, and ensures the stability of the system in a high-pressure environment.

[0064] The conical spring's arc-shaped structure allows it to be smaller and lighter than other springs of the same mass under the same load and operating frequency, effectively saving space and cost. When applied to solenoid valves using a one-way return valve structure, it reduces the valve's size. The spring stiffness of the conical spring gradually decreases with the load, and its performance adaptively adjusts to changes in load. This effectively reduces shocks and vibrations caused by load variations, thus eliminating load fluctuations and maintaining a stable operating state for the solenoid valve, improving its performance and reliability.

[0065] Conical springs have a shorter axial length when compressed to their limit (compared to cylindrical springs), which can effectively reduce the overall height of the valve body, making them particularly suitable for hydraulic systems with limited installation space (such as the miniaturized solenoid valve 2000).

[0066] like Figures 1 to 4 As shown, in one embodiment, the sleeve portion 120 has a second oil passage in the radial direction at the end of the sleeve portion 120 located on the same side of the disc portion 110 as the valve plate 200; when the valve plate 200 is in the conducting position, even if it is not completely in the extreme position of the conducting position (the position where the valve plate 200 and the second stepped surface 410 of the valve sleeve 400 abut), the oil can still enter the sleeve portion 120 through the second oil passage, thereby improving the oil flow efficiency and significantly shortening the response time.

[0067] Traditional structures require the valve plate 200 to be fully open to achieve maximum flow, while this design can achieve a higher flow by partially opening the second oil through-hole, thus expanding the adjustment range of the valve plate 200.

[0068] like Figure 1 As shown, multiple second oil through-holes are evenly spaced around the circumference of the sleeve portion 120, allowing oil to enter the sleeve portion 120 uniformly from different directions. This avoids pressure loss and cavitation caused by excessively high local flow velocities, thus improving flow field stability. The evenly spaced distribution of multiple second oil through-holes can disperse the oil impact force, avoiding pressure fluctuations caused by single-hole flow and improving system stability. Even if the valve plate 200 is partially blocked due to impurities or foreign objects, the second oil through-holes can still guarantee the basic flow rate, preventing complete system failure and improving system fault tolerance.

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

[0070] One end of the support part 220 is in sliding fit with the sleeve part 120, and the other end of the support part 220 is connected to the ring body part 210, and the support part 220 is circumferentially equidistantly arranged multiple times around the ring body part 210.

[0071] Exemplarily, the support part 220 and the ring body part 210 are arranged by welding or one-piece forming.

[0072] By abutting the outer wall of the sleeve part 120 through the support part 220, the radial displacement of the ring body part 210 can be limited, so that the ring body part 210 can accurately block the first oil liquid through hole 122 when switching from the open position to the closed position, and the sealing performance of the valve plate 200 in the closed position is ensured.

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

[0074] In addition, in the open position, the gap between the adjacent support parts 220 allows the oil liquid to pass through, further improving the oil liquid flow efficiency.

[0075] As shown in the drawings, Figure 1 In one embodiment, the first support ring body 126 and the second support ring body 128 are arranged on the end face of the disc body part 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 greater than the diameter of the second support ring body 128, the first oil liquid through hole 122 is located between the first support ring body 126 and the second support ring body 128, and the ring body part 210 abuts the first support ring body 126 and the second support ring body 128 when the valve plate 200 is in the closed position.

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

[0078] As shown in the drawings, Figure 4 In one embodiment, the annular sealing groove 129 is arranged on the end face of the disc body part 110 away from the valve plate 200. The annular sealing groove 129 is provided with a sealing ring.

[0079] In a second aspect, the embodiments of the present application provide an electromagnetic valve 2000, which comprises a main valve body 2100 and a one-way oil return valve structure 1000 according to any of the above embodiments.

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

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

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

[0083] Figure 6 The diagram shows the oil flow when the working cylinder 3100 contracts. Figure 7 The diagram shows the oil flow when the working cylinder 3100 extends.

[0084] A piston rod 3400 is slidably and sealed inside 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, it compresses the first working chamber. When the piston rod 3400 retracts into the working cylinder 3100, it compresses the second working chamber. The first working chamber of the working cylinder 3100 is connected to the intermediate cylinder 3300, and the second working chamber of the working cylinder 3100 is connected to the oil storage cylinder 3200. One end of the sleeve portion 120 of the one-way return valve structure 1000 is connected to 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 is connected to the first oil port on the main valve body 2100 of the solenoid valve 2000. The main valve body 2100 is also provided with a flow passage for connecting to the oil storage cylinder 3200.

[0085] When the valve plate 200 is in the conducting position, one end of the first oil through hole 122 on the disc body 110 is connected to the internal cavity of the valve sleeve 400, and the other end of the disc body 110 is connected to the oil storage cylinder 3200.

[0086] The solenoid valve 2000 is equipped with a valve plate. Oil can enter the first oil passage 122 from the valve sleeve 400. The oil enters the main valve body 2100 from the first oil passage 122. The oil in the main valve body 2100 can flow from the valve plate to the flow passage, and then the oil is discharged from the flow passage to the oil storage cylinder 3200. The valve plate can prevent the oil at the flow passage from the valve plate to the first oil port.

[0087] like Figure 6As shown, when the piston rod 3400 is retracted into the working cylinder 3100, the volume of the second working chamber is compressed by the piston rod 3400, and the volume of the first working chamber is increased; the oil in the second working chamber is compressed and enters the oil storage cylinder 3200, and the oil in the oil storage cylinder 3200 enters the first oil liquid through hole 122 of the disc body 110, and the oil in the first oil liquid through hole 122 pushes the valve plate 200 to the conducting position, and the oil from the first oil liquid through hole 122 enters the chamber of the valve sleeve 400, and the oil in the valve sleeve 400 enters the intermediate cylinder 3300 from the sleeve part 120, the volume of the first working chamber is increased, and the oil 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 oil liquid through hole 122, but also enters the main valve body 2100 from the flow-through through hole of the main valve body 2100, and the oil entering the main valve body 2100 pushes the valve plate in the main valve body 2100, the valve plate blocks the oil from flowing to the first oil liquid port from the flow-through through hole, and the valve plate is pushed by the oil in the flow-through through hole, so that the valve plate also blocks the oil from flowing to the flow-through through hole from the first oil liquid port through the valve plate.

[0088] As shown in the figure, Figure 7 As shown, when the piston rod 3400 is retracted into the working cylinder 3100, the volume of the second working chamber is compressed by the piston rod 3400, and the volume of the first working chamber is increased; the oil in the second working chamber is compressed and enters the oil storage cylinder 3200, and the oil in the oil storage cylinder 3200 enters the first oil liquid through hole 122 of the disc body 110, and the oil in the first oil liquid through hole 122 pushes the valve plate 200 to the conducting position, and the oil from the first oil liquid through hole 122 enters the chamber of the valve sleeve 400, and the oil in the valve sleeve 400 enters the intermediate cylinder 3300 from the sleeve part 120, the volume of the first working chamber is increased, and the oil 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 oil liquid through hole 122, but also enters the main valve body 2100 from the flow-through through hole of the main valve body 2100, and the oil entering the main valve body 2100 pushes the valve plate in the main valve body 2100, the valve plate blocks the oil from flowing to the first oil liquid port from the flow-through through hole, and the valve plate is pushed by the oil in the flow-through through hole, so that the valve plate also blocks the oil from flowing to the flow-through through hole from the first oil liquid port through the valve plate.

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

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

Claims

1. A one-way return valve structure, characterized in that, include: Valve seat (100), the valve seat (100) includes a disc body part (110) and a sleeve part (120), the disc body part (110) is provided with an assembly through hole and a first oil through hole (122) along the axis in the middle, the sleeve part (120) passes through the assembly through hole of the disc body part (110), and the two ends of the sleeve part (120) are open; A valve plate (200) is sleeved on the sleeve portion (120) and slides in cooperation with the sleeve portion (120). The valve plate (200) has a closed position and a open 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 through hole (122). In the open position, the valve plate (200) disengages from the disc portion (110) and the first oil through hole (122) is opened. An elastic element (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 return valve structure according to claim 1, characterized in that, Also includes: A valve sleeve (400) is fitted onto the disc body (110), and the circumferential surface of the disc body (110) that mates with the valve sleeve (400) is a first stepped surface (112).

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

4. The one-way return valve structure according to claim 1, characterized in that, The elastic element (300) is a conical spring, and the two ends of the conical spring are a first end and a second end, respectively, 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 is engaged 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. The second end abuts against the valve plate (200).

5. The one-way return valve structure according to claim 1, characterized in that, The sleeve portion (120) has a second oil passage hole in the radial direction at the end of the sleeve portion (120) located on the same side as the valve plate (200) on the disc portion (110), and multiple second oil passage holes are provided at equal intervals around the circumference of the sleeve portion (120).

6. The one-way return valve structure according to claim 1, characterized in that, The valve plate (200) includes an annular portion (210) and a support portion (220). The annular portion (210) is sleeved on the sleeve portion (120) and there is a gap between the annular portion (210) and the sleeve portion (120). One end of the support portion (220) is slidably engaged with the sleeve portion (120), and the other end of the support portion (220) is connected to the annular portion (210). Multiple support portions (220) are equidistantly arranged around the annular portion (210), and adjacent support portions (220) are spaced apart.

7. The one-way return valve structure according to claim 1, characterized in that, A first support ring (126) and a second support ring (128) are provided on the end face of the disc body (110) near the valve plate (200). The first support ring (126) and the second support ring (128) are spaced apart. The diameter of the first support ring (126) is larger than the diameter of the second support ring (128). The first oil through hole (122) is located between the first support ring (126) and the second support ring (128). When the valve plate (200) is in the closed position, it abuts against the first support ring (126) and the second support ring (128).

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

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

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

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