Stacked two-section one-way valve capable of pre-releasing pressure
By designing a pre-depressurized, stacked two-stage check valve, and utilizing the cooperation of elastic elements and top sealing components, the smooth flow of hydraulic oil is achieved, solving the noise and vibration problems of check valves under high pressure and extending the service life of check valves.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-22
- Publication Date
- 2026-03-27
AI Technical Summary
Existing check valves, when the liquid pressure is too high, cause excessively fast instantaneous liquid flow, resulting in noise and vibration, which can easily lead to damage and reduce service life.
A pre-depressurized, superimposed two-stage check valve was designed. Through the first and second oil control units and the movable control valve core, the hydraulic oil flows smoothly under the action of the hydraulic oil using elastic elements and top sealing components, avoiding direct impact of the liquid on the inner wall of the valve cavity. The hydraulic oil is depressurized using a pressure relief channel and a cylinder connection channel.
It effectively reduces noise and vibration during liquid flow, extends the service life of the check valve, and reduces maintenance and replacement costs.
Smart Images
Figure CN224049453U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of two-stage one-way valves, in particular to a pre-bleed pressure superimposed two-stage one-way valve. BACKGROUND
[0002] A one-way valve is a valve that controls the flow of fluid to achieve the flow and blockage of liquid in the one-way valve by opening and closing the one-way valve.
[0003] In the prior art, when the liquid pressure in the one-way valve channel is too large, the liquid will hit the inner wall of the channel due to the too large instantaneous flow rate at the moment of opening the one-way valve and making the liquid flow unidirectionally in the one-way valve channel, thereby generating noise and vibration. Frequent opening of the one-way valve will cause the one-way valve to be prone to damage, thereby reducing the service life of the one-way valve and resulting in unnecessary maintenance and replacement costs. CONTENT OF THE INVENTION
[0004] To solve the above technical problems and achieve at least one advantage of the present application, the present application provides a pre-bleed pressure superimposed two-stage one-way valve, wherein the pre-bleed pressure superimposed two-stage one-way valve comprises:
[0005] a valve body, the valve body is provided with an axially parallel first oil filling cavity, a second oil filling cavity, a first movable channel and a second movable channel, the first oil filling cavity and the second oil filling cavity are oppositely arranged and communicate with each other, the first movable channel and the second movable channel are oppositely arranged, the first movable channel and the second movable channel respectively communicate with the first oil filling cavity and the second oil filling cavity, the valve body is further provided with at least one first oil flow channel, at least one second oil flow channel, at least one first cylinder connecting channel and at least one second cylinder connecting channel, the first oil flow channel and the second oil flow channel are respectively communicated with the first oil filling cavity and the second oil filling cavity in a manner that hydraulic oil can be introduced, the first movable channel is communicated with the rod cavity of a hydraulic oil cylinder through the first cylinder connecting channel, the second movable channel is communicated with the rodless cavity of the hydraulic oil cylinder through the second cylinder connecting channel, the valve body is radially contracted between the first oil filling cavity and the first movable channel to form a first valve seat portion, and the valve body is radially contracted between the second oil filling cavity and the second movable channel to form a second valve seat portion;
[0006] The first oil control unit comprises a first sealing member, a first main valve core, a first top sealing member and a first elastic member. The first sealing member is arranged at the port of the first movable channel away from the first oil filling cavity. The first main valve core is movably arranged in the first movable channel and abuts against the first valve seat portion so as to close the port of the first movable channel communicating with the first oil filling cavity when the first main valve core abuts against the first valve seat portion. The first main valve core is partially located between the first movable channel and the first connecting cylinder channel. The first main valve core is provided with a first accommodating cavity, a first oil inlet channel and at least one first pressure relief channel. The first accommodating cavity communicates with the first movable channel. The first oil inlet channel is arranged at the end of the first main valve core close to the first oil filling cavity. The first accommodating cavity communicates with the first oil filling cavity through the first oil inlet channel. The first pressure relief channel is arranged at the first main valve core between the first movable channel and the first connecting cylinder channel. The first accommodating cavity communicates with the first connecting cylinder channel through the first pressure relief channel. The first top sealing member is movably arranged in the first accommodating cavity so as to abut against the edge of the first oil inlet channel and close the first oil inlet channel. The first elastic member is arranged in the first movable channel and can be compressed to produce elastic deformation. The two ends of the first elastic member are respectively kept against the first sealing member and the first top sealing member.
[0007] The second oil control unit comprises a second sealing member, a second main valve core, a second top sealing member and a second elastic member. The second sealing member is arranged at the port of the second movable channel away from the second oil filling cavity. The second main valve core is movably arranged in the second movable channel and abuts against the second valve seat portion so as to close the port of the second movable channel communicating with the second oil filling cavity when the second main valve core abuts against the second valve seat portion. The second main valve core is partially located between the second movable channel and the second connecting cylinder channel. The second main valve core is provided with a second accommodating cavity, a second oil inlet channel and at least one second pressure relief channel. The second accommodating cavity communicates with the second movable channel. The second oil inlet channel is arranged at the end of the second main valve core close to the second oil filling cavity. The second accommodating cavity communicates with the second oil filling cavity through the second oil inlet channel. The second pressure relief channel is arranged at the second main valve core between the second movable channel and the second connecting cylinder channel. The second accommodating cavity communicates with the second connecting cylinder channel through the second pressure relief channel. The second top sealing member is movably arranged in the second accommodating cavity and abuts against the edge of the second oil inlet channel so as to close the second oil inlet channel. The second elastic member is arranged in the second movable channel and can be compressed to produce elastic deformation. The two ends of the second elastic member are respectively kept against the second sealing member and the second top sealing member.
[0008] The movable control valve core comprises a wall abutting portion, a first abutting portion and a second abutting portion. The first oil filling cavity and the second oil filling cavity jointly form a sliding channel. The wall abutting portion is movably arranged in the sliding channel in a manner of keeping abutting against the inner wall of the sliding channel. The first abutting portion and the second abutting portion are respectively connected to the wall abutting portion in a manner of keeping coaxial with the wall abutting portion. The first abutting portion and the second abutting portion respectively extend into the first oil filling cavity and the second oil filling cavity. The ends of the first abutting portion and the second abutting portion away from the wall abutting portion are respectively matched with the first oil inlet channel and the second oil inlet channel.
[0009] According to an embodiment of the present application, the second abutting portion extends radially at the end close to the second main valve core to form a second top core step. When the second top sealing member abuts against the edge of the second oil inlet channel, the distance between the end of the second top sealing member close to the second abutting portion and the end of the second main valve core close to the second abutting portion is smaller than the distance between the end of the second abutting portion close to the second main valve core and the second top core step.
[0010] According to an embodiment of the present application, the first pushing portion extends radially at an end close to the first main valve core to form a first top core step, and when the first top sealing member is pressed against the edge of the first oil inlet channel, the distance between the end of the first top sealing member close to the first pushing portion and the end of the first main valve core close to the first pushing portion is smaller than the distance between the end of the first pushing portion close to the first main valve core and the first top core step.
[0011] According to an embodiment of the present application, the first main valve core has a first top sealing edge, and an end portion in contact with the first valve seat portion is inclined to form the first top sealing edge.
[0012] According to an embodiment of the present application, the first main valve core has at least one first accommodating groove opened in the circumferential direction at an end close to the first valve seat portion, and the first oil control unit further comprises at least one first sealing member corresponding to the first accommodating groove, which is arranged in the first accommodating groove.
[0013] According to an embodiment of the present application, the first top sealing member comprises a first top sealing member and a first movable member, the first top sealing member is movably arranged in the first accommodating cavity in a manner that it can press against the edge of the first oil inlet channel and close the first oil inlet channel, and the first movable member is arranged in the first accommodating cavity in a manner that both end portions thereof abut against the first elastic member and the first top sealing member respectively, and the first movable member is arranged between the first elastic member and the first top sealing member.
[0014] According to an embodiment of the present application, the first movable member has a first stabilizing groove, which is used to embed part of the first top sealing member.
[0015] According to an embodiment of the present application, the second main valve core has a second top sealing edge, and an end portion in contact with the second valve seat portion is inclined to form the second top sealing edge.
[0016] According to an embodiment of the present application, the second main valve core has at least one second accommodating groove opened in the circumferential direction at an end close to the second valve seat portion, and the second oil control unit further comprises at least one second sealing member corresponding to the second accommodating groove, which is arranged in the second accommodating groove.
[0017] According to an embodiment of the present application, the second top sealing member comprises a second top sealing piece and a second movable piece, the second top sealing piece is movably arranged in the second accommodating cavity in a manner that the second top sealing piece can press against the edge of the second oil inlet channel and seal the second oil inlet channel, the second movable piece is arranged in the second accommodating cavity in a manner that two ends of the second movable piece respectively abut against the second elastic piece and the second top sealing piece, and the second movable piece is arranged between the second elastic piece and the second top sealing piece. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A structure sectional view schematic diagram of a preferred embodiment of the present application in a state is shown, in which the first top sealing piece and the second top sealing piece respectively press against the edge of the first oil inlet channel and the edge of the second oil inlet channel.
[0019] Figure 2 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. Figure 1 An enlarged view schematic diagram of A in FIG.
[0020] Figure 3 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. Figure 1 An enlarged view schematic diagram of B in FIG.
[0021] Figure 4 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. Figure 1 An enlarged view schematic diagram of C in FIG.
[0022] Figure 5 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown, in which the second top sealing piece is separated from the edge of the second oil inlet channel under the pressing of the second pushing part, and the hydraulic oil in the first oil filling cavity drives the first main valve core away from the first valve seat part, and forms a gap for the hydraulic oil to flow between the first valve seat part and the first main valve core.
[0023] Figure 6 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. Figure 5 An enlarged view schematic diagram of D in FIG.
[0024] Figure 7 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown, in which the second main valve core is driven away from the second valve seat part under the pressing of the second top core step, and forms a gap for the hydraulic oil to flow between the second valve seat part and the second main valve core.
[0025] Figure 8 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. Figure 7 An enlarged view schematic diagram of E in FIG.
[0026] Figure 9 A structure sectional view schematic diagram of a preferred embodiment of the present application in another state is shown. DETAILED DESCRIPTION
[0027] The following description is presented to enable any person skilled in the art to practice the application as claimed. Preferred embodiments are presented in the following description only as examples and modifications can be made by persons skilled in the art without departing from the spirit and scope of the application as defined by the following description. The following description defines in general terms the principles of the application and its application to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the application.
[0028] Those skilled in the art will understand that, in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.
[0029] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation of the number.
[0030] Reference Figures 1 to 9 A pre-bleedable stacked two-stage check valve according to a preferred embodiment of the present application will be described in detail below, wherein the pre-bleedable stacked two-stage check valve comprises a valve body 10, a first oil control unit 20, a second oil control unit 30 and a movable control spool 40.
[0031] Specifically, the valve body 10 is provided with a first oil filling cavity 101, a second oil filling cavity 102, a first movable passage 103 and a second movable passage 104. The first oil filling cavity 101 and the second oil filling cavity 102 are oppositely arranged and in communication with each other. The first movable passage 103 and the second movable passage 104 are oppositely arranged, and the first movable passage 103 and the second movable passage 104 are respectively in communication with the first oil filling cavity 101 and the second oil filling cavity 102. The first oil filling cavity 101, the second oil filling cavity 102, the first movable passage 103 and the second movable passage 104 are axially parallel. The valve body 10 is also provided with at least one first oil flow passage 105, at least one second oil flow passage 106, at least one first cylinder connecting passage 107 and at least one second cylinder connecting passage 108. The first oil flow passage 105 and the second oil flow passage 106 are respectively in communication with the first oil filling cavity 101 and the second oil filling cavity 102 in a manner that can be filled with hydraulic oil. The first movable passage 103 is in communication with a rod cavity 9101 of a hydraulic oil cylinder 91 through the first cylinder connecting passage 107. The second movable passage 104 is in communication with a rodless cavity 9102 of the hydraulic oil cylinder 91 through the second cylinder connecting passage 108. The valve body 10 is radially contracted between the first oil filling cavity 101 and the first movable passage 103 to form a first valve seat portion 11. The valve body 10 is radially contracted between the second oil filling cavity 102 and the second movable passage 104 to form a second valve seat portion 12.
[0032] The first oil control unit 20 comprises a first sealing member 21, a first main valve core 22, a first top sealing member 23 and a first elastic member 24. The first sealing member 21 is arranged at the port of the first movable passage 103 away from the first oil filling cavity 101 to close the port of the first movable passage 103 away from the first oil filling cavity 101 by the first sealing member 21. The first main valve core 22 is movably arranged in the first movable passage 103 in a manner that the first main valve core 22 can move axially along the first movable passage 103 and abut against the first valve seat portion 11 to close the port of the first movable passage 103 communicating with the first oil filling cavity 101 by the first main valve core 22 when the first main valve core 22 abuts against the first valve seat portion 11. The first main valve core 22 is partially located between the first movable passage 103 and the first connecting cylinder passage 107. The first main valve core 22 is provided with a first accommodating cavity 2201, a first oil inlet passage 2202 and at least one first pressure relief passage 2203. The first accommodating cavity 2201 communicates with the first movable passage 103. The first oil inlet passage 2202 is arranged at the end of the first main valve core 22 close to the first oil filling cavity 101, and the first accommodating cavity 2201 communicates with the first oil filling cavity 101 through the first oil inlet passage 2202. The first pressure relief passage 2203 is arranged at the portion of the first main valve core 22 between the first movable passage 103 and the first connecting cylinder passage 107, and the first accommodating cavity 2201 communicates with the first connecting cylinder passage 107 through the first pressure relief passage 2203. The first top sealing member 23 is movably arranged in the first accommodating cavity 2201 in a manner that the first top sealing member 23 can abut against the edge of the first oil inlet passage 2202 and close the first oil inlet passage 2202. The first elastic member 24 is arranged in the first movable passage 103 in a manner that the first elastic member 24 can be compressed to produce elastic deformation, and the two ends of the first elastic member 24 are respectively kept against the first sealing member 21 and the first top sealing member 23.
[0033] The second oil control unit 30 comprises a second sealing member 31, a second main valve core 32, a second top sealing member 33 and a second elastic member 34. The second sealing member 31 is arranged at the port of the second movable passage 104 away from the second oil filling cavity 102 to close the port of the second movable passage 104 away from the second oil filling cavity 102 through the second sealing member 31. The second main valve core 32 is movably arranged in the second movable passage 104 in a manner that it can move axially along the second movable passage 104 and abut against the second valve seat portion 12 to close the port where the second movable passage 104 communicates with the second oil filling cavity 102 through the second main valve core 32 when the second main valve core 32 abuts against the second valve seat portion 12. The second main valve core 32 is partially located between the second movable passage 104 and the second connecting cavity 108. The second main valve core 32 is provided with a second accommodating cavity 3201, a second oil inlet passage 3202 and at least one second pressure relief passage 3203. The second accommodating cavity 3201 communicates with the second movable passage 104. The second oil inlet passage 3202 is arranged at the end of the second main valve core 32 close to the second oil filling cavity 102, and the second accommodating cavity 3201 communicates with the second oil filling cavity 102 through the second oil inlet passage 3202. The second pressure relief passage 3203 is arranged at the position of the second main valve core 32 between the second movable passage 104 and the second connecting cavity 108, and the second accommodating cavity 3201 communicates with the second connecting cavity 108 through the second pressure relief passage 3203. The second top sealing member 33 is movably arranged in the second accommodating cavity 3201 in a manner that it can abut against the edge of the second oil inlet passage 3202 and close the second oil inlet passage 3202. The second elastic member 34 is arranged in the second movable passage 104 in a manner that it can be compressed to produce elastic deformation, and the two ends of the second elastic member 34 are respectively kept against the second sealing member 31 and the second top sealing member 33.
[0034] The movable control valve core 40 comprises a wall-adhering portion 41, a first abutting portion 42 and a second abutting portion 43. The first oil filling cavity 101 and the second oil filling cavity 102 together form a sliding passage, and the wall-adhering portion 41 is movably arranged coaxially in the sliding passage in a manner that it adheres to the inner wall of the sliding passage. The first abutting portion 42 and the second abutting portion 43 are respectively connected to the wall-adhering portion 41 in a manner that they are coaxial with the wall-adhering portion 41, the first abutting portion 42 and the second abutting portion 43 respectively extend into the first oil filling cavity 101 and the second oil filling cavity 102, and the ends of the first abutting portion 42 and the second abutting portion 43 away from the wall-adhering portion 41 are respectively adapted to the first oil inlet passage 2202 and the second oil inlet passage 3202.
[0035] Preferably, the first oil inlet channel 2202 is located at one end of the first main valve core 22 axially near the first oil filling chamber 101. The second oil inlet channel 3202 is located at one end of the second main valve core 32 axially near the second oil filling chamber 102.
[0036] Preferably, both the first elastic element 24 and the second elastic element 34 are implemented as springs.
[0037] It should be noted that when hydraulic oil is continuously supplied to the rod chamber 9101 of the hydraulic cylinder 91 through the first connecting cylinder channel 107, so that the hydraulic oil in the rod chamber 9101 presses the piston unit 92 located between the rod chamber 9101 and the rodless chamber 9102, the spatial volume of the rod chamber 9101 and the rodless chamber 9102 will increase and decrease respectively. At the same time, the hydraulic oil in the rodless chamber 9102 will be forced back to the second connecting cylinder channel 108.
[0038] like Figures 1 to 6 As shown, as an example, during the process of hydraulic oil being introduced into the first oil flow channel 105, the hydraulic oil continuously enters the first oil filling chamber 101 through the first oil flow channel 105 to continuously increase the hydraulic pressure in the first oil filling chamber 101. The hydraulic oil in the first oil filling chamber 101 continuously presses the wall-attached portion 41 of the movable control valve core 40 and the first main valve core 22. Under the pressure of the hydraulic oil in the first oil filling chamber 101, the first main valve core 22 will be pressed to cause the first elastic element 24 to undergo elastic deformation through the first top sealing member 23. At this time, the first main valve core 22 will move axially in the first movable channel 103 and move away from the first valve seat portion 11, forming a gap between the first valve seat portion 11 and the first main valve core 22 for hydraulic oil to flow. The hydraulic oil introduced into the first oil filling chamber 101 will flow into the first connecting cylinder channel 107 through this gap and enter the rod chamber 9101.
[0039] Simultaneously, under the pressure of the hydraulic oil in the first oil filling chamber 101, the wall-adhering part 41 will be pressed in a manner that keeps it adhering to the inner wall of the sliding channel and move axially toward the second top sealing member 33. During the process of the wall-adhering part 41 driving the second pushing part 43 to extend into the second oil inlet channel 3202, the second pushing part 43 will push the second top sealing member 33 away from the edge of the second oil inlet channel 3202, so that the second oil filling chamber 102 communicates with the second receiving chamber 3201 through the second oil inlet channel 3202.
[0040] The hydraulic oil continuously entering the first connecting cylinder passage 107 is continuously introduced into the rod cavity 9101 to increase the space volume of the rod cavity 9101 by introducing hydraulic oil into the rod cavity 9101, and to compress the space volume of the rodless cavity 9102, so as to press the hydraulic oil in the rodless cavity 9102 back to the second connecting cylinder passage 108. The part of the hydraulic oil with higher hydraulic pressure that is pressed back to the second connecting cylinder passage 108 enters the second oil filling cavity 102 through the second pressure relief passage 3203, the second containing cavity 3201 and the second oil inlet passage 3202 in sequence, and then flows out from the second oil flow passage 106, so as to prevent the hydraulic oil with higher hydraulic pressure in the second connecting cylinder passage 108 from colliding with the inner wall of the second oil filling cavity 102 due to too fast flow into the second oil filling cavity 102, thereby preventing the service life of the pre-releasable superimposed two-stage check valve from being affected due to long-term collision of the hydraulic oil with the inner wall of the second oil filling cavity 102. That is, the part of the hydraulic oil with higher hydraulic pressure that is pressed back to the second connecting cylinder passage 108 enters the second oil filling cavity 102 through the second pressure relief passage 3203, the second containing cavity 3201 and the second oil inlet passage 3202 in sequence, so as to relieve the pressure of the hydraulic oil in the second connecting cylinder passage 108.
[0041] Preferably, the second pushing part 43 extends radially near the end of the second main valve core 32 to form a second top core step 431. When the second top sealing member 33 is held against the edge of the second oil inlet passage 3202, the distance between the end of the second top sealing member 33 near the second pushing part 43 and the end of the second main valve core 32 near the second pushing part 43 is smaller than the distance between the end of the second pushing part 43 near the second main valve core 32 and the second top core step 431.
[0042] As Figures 7 to 8As shown, further exemplarily, in the process of continuously introducing hydraulic oil into the first oil charging cavity 101 through the first oil flow passage 105 after the wall-attached portion 41 drives the second pushing portion 43 to extend into the second oil inlet passage 3202 and pushes the second top sealing member 33 away from the edge of the second oil inlet passage 3202 through the second pushing portion 43, under the continuous pressure of the hydraulic oil in the first oil charging cavity 101, the wall-attached portion 41 will be continuously pressed to keep adhering to the inner wall of the sliding passage and move axially towards the position of the second top sealing member 33 to top the second top core step 431 of the second pushing portion 43 on the second main valve core 32 to drive the second main valve core 32 away from the second valve seat portion 12, so that the hydraulic oil in the second cylinder passage 108 after pressure relief flows into the second oil charging cavity 102 through the gap between the second main valve core 32 and the second valve seat portion 12.
[0043] It is worth mentioning that in the process of continuously moving the wall-attached portion 41 to keep adhering to the inner wall of the sliding passage and moving axially towards the position of the second top sealing member 33 to drive the second pushing portion 43 to continuously move, the hydraulic oil with higher hydraulic pressure in the second cylinder passage 108 will be first pressure relieved and then flow into the second oil charging cavity 102 through the gap between the second main valve core 32 and the second valve seat portion 12. Since this process is continuous, it can prevent the hydraulic oil with higher hydraulic pressure in the second cylinder passage 108 from colliding with the inner wall of the second oil charging cavity 102 due to too fast flow into the second oil charging cavity 102, thereby preventing noise and vibration.
[0044] It should be noted that when the continuous supply of hydraulic oil into the first oil charging cavity 101 through the first oil flow passage 105 is stopped, the wall-attached portion 41 will no longer be pressed by the hydraulic oil in the first oil charging cavity 101 to drive the second abutting portion 43 to press against the second main valve core 32 and the second top sealing member 33. At this time, the resilience of the second elastic member 34 will automatically press the second top sealing member 33 against the edge of the second oil inlet passage 3202, and the second elastic member 34 will also automatically press the second main valve core 32 against the second valve seat portion 12 through the second top sealing member 33 to again close the port of the second movable passage 104 near the second oil charging cavity 102 by the second main valve core 32, preventing the hydraulic oil in the second connecting cylinder passage 108 from flowing into the second oil charging cavity 102. At the same time, since the hydraulic oil in the first oil charging cavity 101 cannot press the first main valve core 22 at this time, the resilience of the first elastic member 24 will automatically press the first main valve core 22 against the first valve seat portion 11 through the first top sealing member 23 to again close the port of the first movable passage 103 near the first oil charging cavity 101 by the first main valve core 22.
[0045] It should also be noted that when the continuous supply of hydraulic oil into the rodless cavity 9102 of the hydraulic oil cylinder 91 through the second connecting cylinder passage 108 is performed in advance, the space volume of the rod cavity 9101 and the rodless cavity 9102 will decrease and increase, respectively, when the piston unit 92 located between the rod cavity 9101 and the rodless cavity 9102 is pressed by the hydraulic oil in the rodless cavity 9102, and at the same time, the hydraulic oil in the rod cavity 9101 will be pressed back into the first connecting cylinder passage 107.
[0046] Correspondingly, as an example, during the process of supplying hydraulic oil into the second oil flow passage 106, hydraulic oil will continuously enter the second oil charging cavity 102 through the second oil flow passage 106 to continuously increase the hydraulic pressure in the second oil charging cavity 102, and continuously press the wall-attached portion 41 of the movable control valve core 40 and the second main valve core 32 by the hydraulic oil in the second oil charging cavity 102. Under the pressing of the hydraulic oil in the second oil charging cavity 102, the second main valve core 32 will be pressed to cause the second elastic member 34 to elastically deform through the second top sealing member 33. At this time, the second main valve core 32 will move axially in the second movable passage 104 away from the second valve seat portion 12, and form a gap between the second valve seat portion 12 and the second main valve core 32 for the flow of hydraulic oil. The hydraulic oil supplied into the second oil charging cavity 102 will flow into the second connecting cylinder passage 108 and enter the rodless cavity 9102 through this gap.
[0047] Meanwhile, under the pressure of the hydraulic oil in the second oil filling cavity 102, the wall-attached portion 41 is pressed and moves axially towards the first top sealing member 23 in a manner of keeping attached to the inner wall of the sliding channel. In the process of the wall-attached portion 41 driving the first pushing portion 42 to extend into the first oil inlet channel 2202, the first pushing portion 42 pushes the first top sealing member 23 away from the edge of the first oil inlet channel 2202, so that the first oil filling cavity 101 is communicated with the first containing cavity 2201 through the first oil inlet channel 2202.
[0048] Wherein, the hydraulic oil continuously entering the second connecting cylinder channel 108 is continuously communicated to the rodless cavity 9102, so as to increase the space volume of the rodless cavity 9102 by communicating the hydraulic oil into the rodless cavity 9102, and at the same time, compress the space volume of the cylinder cavity 9101, so as to press the hydraulic oil in the cylinder cavity 9101 back to the first connecting cylinder channel 107. The part of the hydraulic oil with higher pressure, which is pressed back to the first connecting cylinder channel 107, enters the first oil filling cavity 101 through the first pressure relief channel 2203, the first containing cavity 2201 and the first oil inlet channel 2202 in sequence, and then flows out from the first oil outlet channel 105, so as to prevent the part of the hydraulic oil with higher pressure in the first connecting cylinder channel 107 from colliding with the inner wall of the first oil filling cavity 101 due to too fast flowing into the first oil filling cavity 101, and thus prevent the service life of the pre-releasable superimposed two-way valve from being affected due to the long-term collision of the hydraulic oil with the inner wall of the first oil filling cavity 101. That is, the part of the hydraulic oil with higher pressure, which is pressed back to the first connecting cylinder channel 107, enters the first oil filling cavity 101 through the first pressure relief channel 2203, the first containing cavity 2201 and the first oil inlet channel 2202 in sequence, so as to release the pressure of the hydraulic oil in the first connecting cylinder channel 107.
[0049] Preferably, the first pushing portion 42 extends radially at the end close to the first main valve core 22 to form a first top core step 421. When the first top sealing member 23 is kept pressed against the edge of the first oil inlet channel 2202, the distance between the end of the first top sealing member 23 close to the first pushing portion 42 and the end of the first main valve core 22 close to the first pushing portion 42 is smaller than the distance between the end of the first pushing portion 42 close to the first main valve core 22 and the first top core step 421.
[0050] Further exemplarily, after the abutting part 41 drives the first pushing part 42 to extend into the first oil inlet channel 2202, and pushes the first top sealing member 23 away from the edge of the first oil inlet channel 2202 through the first pushing part 42, in the process of continuously supplying hydraulic oil into the second oil-filled cavity 102 through the second oil flow channel 106, under the continuous pressure of the hydraulic oil in the second oil-filled cavity 102, the abutting part 41 will be continuously pressed to keep abutting to the inner wall of the sliding channel and move axially towards the position of the first top sealing member 23, so as to top the first top core step 421 of the first pushing part 42 on the first main valve core 22 to drive the first main valve core 22 away from the first valve seat part 11, so that the hydraulic oil in the first cylinder channel 107 after pressure relief flows into the first oil-filled cavity 101 through the gap between the first main valve core 22 and the first valve seat part 11.
[0051] It is also worth mentioning that in the process of continuously moving the first pushing part 42 driven by the abutting part 41 continuously pressed by the hydraulic oil in the second oil-filled cavity 102 to keep abutting to the inner wall of the sliding channel and move axially towards the position of the first top sealing member 23, the hydraulic oil with higher hydraulic pressure in the first cylinder channel 107 will be first pressure relieved and then flow into the first oil-filled cavity 101 through the gap between the first main valve core 22 and the first valve seat part 11. Since the process is continuous, the hydraulic oil with higher hydraulic pressure in the first cylinder channel 107 can be prevented from impacting the inner wall of the first oil-filled cavity 101 due to too fast flow into the first oil-filled cavity 101, thereby preventing noise and vibration.
[0052] Also need to be explained is that when stopping the continuous flow of hydraulic oil into the second oil-filled cavity 102 through the second oil flow channel 106, the wall-attached portion 41 will no longer be pressed by the hydraulic oil in the second oil-filled cavity 102 to drive the first push portion 42 to press the first main valve core 22 and the first top sealing member 23. At this time, the rebound force of the first elastic member 24 will automatically press the first top sealing member 23 against the edge of the first oil inlet channel 2202, and the first elastic member 24 will also automatically press the first main valve core 22 against the first valve seat portion 11 through the first top sealing member 23 to close the port of the first movable channel 103 near the first oil-filled cavity 101 again through the first main valve core 22, preventing the hydraulic oil in the first connecting cylinder channel 107 from flowing into the first oil-filled cavity 101. At the same time, since the hydraulic oil in the second oil-filled cavity 102 cannot press the second main valve core 32 at this time, the rebound force of the second elastic member 34 will automatically press the second main valve core 32 against the second valve seat portion 12 again through the second top sealing member 33 to close the port of the second movable channel 104 near the second oil-filled cavity 102 again through the second main valve core 32.
[0053] Preferably, the wall-attached portion 41 is provided with at least one circumferential groove 4101.
[0054] In this embodiment, a sealing ring is arranged in each of the circumferential grooves 4101 to prevent gaps from occurring between the wall-attached portion 41 and the inner wall of the sliding channel when the wall-attached portion 41 moves axially in the sliding channel in a manner of keeping attached to the inner wall of the sliding channel, thereby preventing the hydraulic oil in the first oil-filled cavity 101 from flowing into the second oil-filled cavity 102 through the gaps between the wall-attached portion 41 and the sliding channel, and preventing the hydraulic oil in the second oil-filled cavity 102 from flowing into the first oil-filled cavity 101 through the gaps between the wall-attached portion 41 and the sliding channel.
[0055] As deformable, the circumferential grooves 4101 are implemented as three, and a sealing ring is arranged in the middle circumferential groove 4101. The circumferential grooves 4101 on both sides are filled with lubricating oil, so that when the pre-pressure-releasable stacked two-way valve is not used for a long time, the lubricating oil in the circumferential grooves 4101 on both sides flows to the surface of the sealing ring in the middle circumferential groove 4101, thereby preventing the static friction between the sealing ring in the circumferential grooves 4101 and the inner wall of the sliding channel from increasing, to prevent the wall-attached portion 41 from being stuck when moving in the sliding channel.
[0056] Preferably, the first main valve core 22 has a first top sealing edge 221. An end portion of the first main valve core 22 in contact with the first valve seat portion 11 is inclined to form the first top sealing edge 221.
[0057] It can be understood that the first main valve core 22 will be pressed against the first valve seat portion 11 by the first top sealing edge 221 to close the port where the first movable passage 103 communicates with the first oil charging cavity 101 by the first top sealing edge 221. Since the first top sealing edge 221 presents line contact when pressed against the first valve seat portion 11, the pressure when the first top sealing edge 221 is pressed against the first valve seat portion 11 can be increased to improve the pressure of the first top sealing edge 221 pressed against the first valve seat portion 11, so that the first main valve core 22 is more likely to stably close the port where the first movable passage 103 communicates with the first oil charging cavity 101 by the first top sealing edge 221 pressed against the first valve seat portion 11.
[0058] Preferably, the first main valve core 22 has at least one first accommodating groove formed in the end portion close to the first valve seat portion 11 in the circumferential direction. The first oil control unit 20 further comprises at least one first sealing member 25 corresponding to the first accommodating groove. The first sealing member 25 is arranged in the first accommodating groove to improve the sealing between the first main valve core 22 and the first valve seat portion 11 by the elastic deformation of the first sealing member 25 abutting against the first valve seat portion 11 when the first top sealing edge 221 of the first main valve core 22 is pressed against the first valve seat portion 11, so as to prevent the hydraulic oil in the first connecting passage 107 from flowing into the first oil charging cavity 101.
[0059] Preferably, the first sealing member 25 is implemented as a sealing ring, and the first sealing member 25 is made of PTFE or polyurethane or NBR material.
[0060] For example, the first sealing member 25 is installed in the first accommodating groove by mechanical processing or compression molding. Preferably, the first sealing member 25 is arranged in the first accommodating groove by injection molding in the first accommodating groove.
[0061] It is worth mentioning that, when the first top sealing edge 221 of the first main valve core 22 is pressed against the first valve seat portion 11 to close the port of the first movable passage 103 near the first oil charging cavity 101, the sealing stability of the port of the first movable passage 103 near the first oil charging cavity 101 can be further improved due to the arrangement of the first sealing member 25. Since the first sealing member 25 is softer than the first top sealing edge 221, and the first sealing member 25 is easy to return to its original state by elastic deformation after being impacted, when the first top sealing edge 221 is abraded by the tiny particles in the hydraulic oil, the first main valve core 22 and the first valve seat portion 11 still maintain sealing due to the arrangement of the first sealing member 25.
[0062] Preferably, the first top sealing member 23 comprises a first top sealing member 231 and a first movable member 232. The first top sealing member 231 is movably arranged in the first accommodating cavity 2201 in a manner that it can press against the edge of the first oil inlet passage 2202 and close the first oil inlet passage 2202. The first movable member 232 is arranged in the first accommodating cavity 2201 in a manner that both ends thereof abut against the first elastic member 24 and the first top sealing member 231 respectively, and the first movable member 232 is arranged between the first elastic member 24 and the first top sealing member 231.
[0063] That is, the first elastic member 24 is arranged in a manner that both ends thereof abut against the first sealing member 21 and one end of the first movable member 232 respectively, and the other end of the first movable member 232 abuts against the first top sealing member 231. Under the action of the elastic force of the first elastic member 24, the first top sealing member 231 is pressed against the edge of the first oil inlet passage 2202, and the elastic force of the first elastic member 24 will press the first main valve core 22 against the first valve seat portion 11 through the first movable member 232 and the first top sealing member 231.
[0064] Specifically, the first movable piece 232 has a first stabilizing groove 23201. The first stabilizing groove 23201 is used to embed part of the first top sealing piece 231. When the rebounding force of the first elastic piece 24 pushes the first top sealing piece 231 against the edge of the first oil inlet channel 2202 through the first movable piece 232, the first top sealing piece 231 is partially embedded in the first stabilizing groove 23201 to prevent the first top sealing piece 231 from being pushed against the edge of the first oil inlet channel 2202 and being offset. In other words, by partially embedding the first top sealing piece 231 in the first stabilizing groove 23201, the stability of the first movable piece 232 pushing the first top sealing piece 231 against the edge of the first oil inlet channel 2202 and closing the first oil inlet channel 2202 is improved.
[0065] Further, the first movable piece 232 partially extends into the first elastic piece 24 to form a first anti-disengagement part 2321. The first anti-disengagement part 2321 of the first movable piece 232 remains extended into the first elastic piece 24 to keep the end of the first elastic piece 24 away from the first sealing piece 21 against the first movable piece 232 when the first elastic piece 24 is compressed and rebounded, preventing disengagement, thereby improving the stability of the first elastic piece 24 during compression and rebound.
[0066] As a preferred embodiment, the first top sealing piece 231 is implemented as a ball, and the first top sealing piece 231 is made of, but not limited to, peek and pom materials, so that when the first top sealing piece 231 is pushed against the edge of the first oil inlet channel 2202, slight deformation of the first top sealing piece 231 occurs to improve the sealing performance of the first top sealing piece 231 when it is pushed against the edge of the first oil inlet channel 2202.
[0067] It should be noted that when the pre-discharge superimposed two-way valve is connected to the hydraulic oil cylinder 91 and is in a pressure maintaining state as a whole, the first top sealing piece 231 will remain pushed against the edge of the first oil inlet channel 2202, and the first top sealing edge 221 and the first sealing piece 25 will also remain pushed against the first valve seat part 11 to prevent the hydraulic oil in the first connecting cylinder channel 107 from flowing into the first oil filling cavity 101.
[0068] When the hydraulic oil in the first connecting channel 107 expands due to high temperature, the expanded hydraulic oil in the first connecting channel 107 enters the first accommodating cavity 2201 through the first pressure relief channel 2203 to press the first top sealing member 231, so as to accommodate the hydraulic oil expanded due to high temperature through slight deformation of the first top sealing member 231, thereby preventing the expanded hydraulic oil from expanding and breaking the inner wall of the first connecting channel 107, preventing the expanded hydraulic oil from repeatedly pressing the first top sealing edge 221 of the first top sealing member 231 on the first valve seat portion 11 to cause damage to the first top sealing edge 221, and prolonging the service life of the pre-pressure relief superimposed two-way valve.
[0069] Preferably, the second main valve core 32 has a second top sealing edge 321. The end portion of the second main valve core 32 in contact with the second valve seat portion 12 is inclined to form the second top sealing edge 321.
[0070] It can be understood that the second main valve core 32 is pressed on the second valve seat portion 12 through the second top sealing edge 321 to close the port between the second active channel 104 and the second oil filling cavity 102 through the second top sealing edge 321. Since the second top sealing edge 321 is in line contact with the second valve seat portion 12 when it is pressed on the second valve seat portion 12, the pressure intensity when the second top sealing edge 321 is pressed on the second valve seat portion 12 can be increased, thereby increasing the pressure of the second top sealing edge 321 pressed on the second valve seat portion 12, and making the second main valve core 32 more easily and stably close the port between the second active channel 104 and the second oil filling cavity 102 through the second top sealing edge 321 pressed on the second valve seat portion 12.
[0071] Preferably, the end portion of the second main valve core 32 close to the second valve seat portion 12 is provided with at least one second accommodating groove in the circumferential direction. The second oil control unit 30 further comprises at least one second sealing member 35 corresponding to the second accommodating groove. The second sealing member 35 is arranged in the second accommodating groove, so that when the second top sealing edge 321 of the second main valve core 32 is pressed on the second valve seat portion 12, the second sealing member 35 is elastically deformed by being pressed on the second valve seat portion 12 to improve the sealing between the second main valve core 32 and the second valve seat portion 12, and prevent the hydraulic oil in the second connecting channel 108 from flowing into the second oil filling cavity 102.
[0072] Preferably, the second sealing member 35 is implemented as a sealing ring, and the second sealing member 35 is made of PTFE or polyurethane or NBR material.
[0073] As an example, the second sealing member 35 is installed in the second accommodating groove by means of machining forming or compression molding. Preferably, the second sealing member 35 is arranged in the second accommodating groove by means of injection molding in the second accommodating groove.
[0074] It is worth mentioning that, while the second top sealing edge 321 of the second main valve core 32 is pressed against the second valve seat portion 12 to close the port of the second active channel 104 close to the second oil charging cavity 102, the sealing stability of the port of the second active channel 104 close to the second oil charging cavity 102 can be further improved due to the arrangement of the second sealing member 35. Since the second sealing member 35 is softer than the second top sealing edge 321, and the second sealing member 35 is easy to recover to its original state by elastic deformation after being impacted, when the second top sealing edge 321 is abraded by the tiny particles in the hydraulic oil, the arrangement of the second sealing member 35 ensures that the second main valve core 32 and the second valve seat portion 12 still maintain sealing.
[0075] Preferably, the second top sealing member 33 includes a second sealing member 331 and a second active member 332. The second sealing member 331 is movably arranged in the second accommodating cavity 3201 in a manner that can press the edge of the second oil inlet channel 3202 and close the second oil inlet channel 3202. The second active member 332 is arranged in the second accommodating cavity 3201 in a manner that both ends thereof are respectively kept in abutment with the second elastic member 34 and the second sealing member 331, and the second active member 332 is arranged between the second elastic member 34 and the second sealing member 331.
[0076] That is, the second elastic member 34 is compressed and elastically deformed in a manner that both ends thereof are respectively kept in abutment with the second sealing member 31 and one end of the second active member 332, and the other end of the second active member 332 is kept in abutment with the second sealing member 331, so that the second sealing member 331 is pressed against the edge of the second oil inlet channel 3202 under the elastic force of the second elastic member 34, and the elastic force of the second elastic member 34 will press the second main valve core 32 against the second valve seat portion 12 through the second active member 332 and the second sealing member 331.
[0077] Specifically, the second movable member 332 has a second stabilizing groove 33201. The second stabilizing groove 33201 is used to partially embed the second top sealing member 331. When the rebounding force of the second elastic member 34 pushes the second top sealing member 331 against the edge of the second oil inlet channel 3202 through the second movable member 332, the second top sealing member 331 is partially embedded in the second stabilizing groove 33201 to prevent the second top sealing member 331 from being pushed against the edge of the second oil inlet channel 3202 and being offset. In other words, the second top sealing member 331 is partially embedded in the second stabilizing groove 33201 to improve the stability of the second movable member 332 when pushing the second top sealing member 331 against the edge of the second oil inlet channel 3202 and closing the second oil inlet channel 3202.
[0078] Further, the second movable member 332 partially extends into the second elastic member 34 to form a second anti-disengagement portion 3321. The second anti-disengagement portion 3321 of the second movable member 332 remains extended into the second elastic member 34 to keep the end of the second elastic member 34 away from the second sealing member 31 against the second movable member 332 when the second elastic member 34 is compressed and rebounded, preventing disengagement, thereby improving the stability of the second elastic member 34 during compression and rebound.
[0079] As a preferred embodiment, the second top sealing member 331 is implemented as a ball, and the second top sealing member 331 is made of, but not limited to, peek and pom materials, so that when the second top sealing member 331 is pushed against the edge of the second oil inlet channel 3202, the second top sealing member 331 is slightly deformed to improve the sealing performance of the second top sealing member 331 when being pushed against the edge of the second oil inlet channel 3202.
[0080] It should be noted that when the pre-discharge superimposed two-way valve is connected to the hydraulic oil cylinder 91 and is in a pressure maintaining state as a whole, the second top sealing member 331 will remain pushed against the edge of the second oil inlet channel 3202, and the second top sealing edge 321 and the second sealing member 35 will remain pushed against the second valve seat portion 12 to prevent the hydraulic oil in the second connecting cylinder channel 108 from flowing into the second oil filling cavity 102.
[0081] When the hydraulic oil in the second connecting-cylinder passage 108 expands due to high temperature, the expanded hydraulic oil in the second connecting-cylinder passage 108 enters the second accommodating cavity 3201 through the second pressure relief passage 3203 to press the second top sealing member 331, so as to accommodate the hydraulic oil expanded due to high temperature through slight deformation of the second top sealing member 331, thereby preventing the expanded hydraulic oil from bursting the inner wall of the second connecting-cylinder passage 108, preventing the expanded hydraulic oil from repeatedly pressing the second top sealing edge 321 on the second valve seat part 12 through the second top sealing member 331 to cause damage to the second top sealing edge 321, and improving the service life of the pre-pressure relief superimposed two-stage check valve.
[0082] Preferably, the wall-adhering part 41, the first pushing part 42 and the second pushing part 43 are integrally formed.
[0083] In the embodiment, preferably, the first oil-filled cavity 101, the second oil-filled cavity 102, the first movable passage 103 and the second movable passage 104 are coaxial.
[0084] Those skilled in the art should understand that the embodiments of the application described above and shown in the drawings are only examples of the application and do not limit the application. The advantages of the application have been fully and effectively achieved. The functional and structural principles of the application have been shown and described in the embodiments, and the embodiments of the application can be modified or changed in any way without departing from the principles.
Claims
1. A pre-bleedable stacked two-way check valve characterized in that, The pre-discharge superimposed two-stage one-way valve comprises: a valve body, which is provided with an axially parallel first oil filling cavity, a second oil filling cavity, a first movable channel and a second movable channel, the first oil filling cavity and the second oil filling cavity are oppositely arranged and communicated with each other, the first movable channel and the second movable channel are oppositely arranged, the first movable channel and the second movable channel are respectively communicated with the first oil filling cavity and the second oil filling cavity, the valve body is further provided with at least one first oil flow channel, at least one second oil flow channel, at least one first cylinder connecting channel and at least one second cylinder connecting channel, the first oil flow channel and the second oil flow channel are respectively communicated with the first oil filling cavity and the second oil filling cavity in a manner that can be filled with hydraulic oil, the first movable channel is communicated with a rod cavity of a hydraulic oil cylinder through the first cylinder connecting channel, the second movable channel is communicated with a rodless cavity of the hydraulic oil cylinder through the second cylinder connecting channel, the valve body is radially contracted between the first oil filling cavity and the first movable channel to form a first valve seat part, and the valve body is radially contracted between the second oil filling cavity and the second movable channel to form a second valve seat part; a first oil control unit, which comprises a first sealing member, a first main valve core, a first top sealing member and a first elastic member, the first sealing member is arranged at a port of the first movable channel away from the first oil filling cavity, the first main valve core is movably arranged in the first movable channel in a manner that can be axially moved along the first movable channel and pressed against the first valve seat part, so that the first main valve core closes the port of the first movable channel communicated with the first oil filling cavity when the first main valve core is pressed against the first valve seat part, the first main valve core is partially located between the first movable channel and the first cylinder connecting channel, the first main valve core is provided with a first accommodating cavity, a first oil inlet channel and at least one first pressure relief channel, the first accommodating cavity is communicated with the first movable channel, the first oil inlet channel is arranged at an end of the first main valve core close to the first oil filling cavity, the first accommodating cavity is communicated with the first oil filling cavity through the first oil inlet channel, the first pressure relief channel is arranged at a position of the first main valve core between the first movable channel and the first cylinder connecting channel, the first accommodating cavity is communicated with the first cylinder connecting channel through the first pressure relief channel, the first top sealing member is movably arranged in the first accommodating cavity in a manner that can press the edge of the first oil inlet channel and close the first oil inlet channel, and the first elastic member is arranged in the first movable channel in a manner that can be compressed to produce elastic deformation, and two ends of the first elastic member are respectively kept against the first sealing member and the first top sealing member. The second oil control unit comprises a second sealing member, a second main valve core, a second top sealing member and a second elastic member. The second sealing member is arranged at the port of the second movable channel away from the second oil filling cavity. The second main valve core is movably arranged in the second movable channel and abuts against the second valve seat portion so as to close the port of the second movable channel communicating with the second oil filling cavity when the second main valve core abuts against the second valve seat portion. The second main valve core is partially located between the second movable channel and the second connecting cylinder channel. The second main valve core is provided with a second accommodating cavity, a second oil inlet channel and at least one second pressure relief channel. The second accommodating cavity communicates with the second movable channel. The second oil inlet channel is arranged at the end of the second main valve core close to the second oil filling cavity. The second accommodating cavity communicates with the second oil filling cavity through the second oil inlet channel. The second pressure relief channel is arranged at the second main valve core between the second movable channel and the second connecting cylinder channel. The second accommodating cavity communicates with the second connecting cylinder channel through the second pressure relief channel. The second top sealing member is movably arranged in the second accommodating cavity and abuts against the edge of the second oil inlet channel so as to close the second oil inlet channel. The second elastic member is arranged in the second movable channel and can be compressed to produce elastic deformation. The two ends of the second elastic member are respectively kept against the second sealing member and the second top sealing member. The movable control valve core comprises a wall abutting portion, a first pushing portion and a second pushing portion. The first oil filling cavity and the second oil filling cavity jointly form a sliding channel. The wall abutting portion is movably arranged in the sliding channel in a manner of keeping abutting against the inner wall of the sliding channel. The first pushing portion and the second pushing portion are respectively connected to the wall abutting portion in a manner of keeping coaxial with the wall abutting portion. The first pushing portion and the second pushing portion respectively extend into the first oil filling cavity and the second oil filling cavity. The ends of the first pushing portion and the second pushing portion away from the wall abutting portion are respectively matched with the first oil inlet channel and the second oil inlet channel.
2. The pre-discharge pressure-relieving stacked two-way check valve according to claim 1, wherein The second pushing portion extends radially at the end close to the second main valve core to form a second top core step. When the second top sealing member abuts against the edge of the second oil inlet channel, the distance between the end of the second top sealing member close to the second pushing portion and the end of the second main valve core close to the second pushing portion is smaller than the distance between the end of the second pushing portion close to the second main valve core and the second top core step.
3. The pre-discharge pressure-relievable stacked two-way check valve of claim 2, wherein, The first push portion extends radially at an end close to the first main valve core to form a first top core step, and when the first top sealing member is pressed against the edge of the first oil inlet channel, the distance between the end of the first top sealing member close to the first push portion and the end of the first main valve core close to the first push portion is smaller than the distance between the end of the first push portion close to the first main valve core and the first top core step.
4. The pre-discharge pressure-relieving stacked two-way check valve according to claim 3, wherein The first main valve core has a first top sealing edge, and an end portion in contact with the first valve seat portion is inclined to form the first top sealing edge.
5. The pre-discharge pressure-relievable stacked two-way check valve of claim 4, wherein, The first main valve core is provided with at least one first accommodating groove at an end close to the first valve seat portion in the circumferential direction, and the first oil control unit further comprises at least one first sealing member corresponding to the first accommodating groove, which is arranged in the first accommodating groove.
6. The pre-discharge pressure-relievable stacked two-way check valve of claim 5, wherein, The first top sealing member comprises a first top sealing member and a first movable member, the first top sealing member is movably arranged in the first accommodating cavity in a manner that can press against the edge of the first oil inlet channel and close the first oil inlet channel, and the first movable member is arranged in the first accommodating cavity in a manner that both end portions thereof abut against the first elastic member and the first top sealing member respectively, and the first movable member is arranged between the first elastic member and the first top sealing member.
7. The pre-discharge pressure-relievable stacked two-way check valve of claim 6, wherein, The first movable member has a first stabilizing groove for embedding part of the first top sealing member.
8. The pre-discharge pressure-relievable stacked two-way check valve of claim 7, wherein, The second main valve core has a second top sealing edge, and an end portion in contact with the second valve seat portion is inclined to form the second top sealing edge.
9. The pre-discharge pressure-relievable stacked two-way check valve of claim 8, wherein, The second main valve core is provided with at least one second accommodating groove at an end close to the second valve seat portion in the circumferential direction, and the second oil control unit further comprises at least one second sealing member corresponding to the second accommodating groove, which is arranged in the second accommodating groove.
10. The pre-discharge pressure-relievable stacked two-way check valve according to any one of claims 2 to 9, characterized in that, The second top sealing member comprises a second top sealing member and a second movable member, the second top sealing member is movably arranged in the second accommodating cavity in a manner that can press against the edge of the second oil inlet channel and close the second oil inlet channel, and the second movable member is arranged in the second accommodating cavity in a manner that both end portions thereof abut against the second elastic member and the second top sealing member respectively, and the second movable member is arranged between the second elastic member and the second top sealing member.