Pressure selection valve, pressure stop valve structure and hydraulic system

Abstract

The invention belongs to the technical field of engineering elements, and discloses a pressure selection valve, a pressure stop valve structure and a hydraulic system. The pressure selection valve at least comprises a valve sleeve, a first valve element and a second valve element, the valve sleeve is at least provided with a first oil port and a second oil port, the first oil port and the second oil port are communicated with an inner cavity of the valve sleeve, and the first valve element and the second valve element are sequentially arranged in the inner cavity in a sliding mode. When the oil pressure at the first oil port is larger than that at the second oil port, the first valve element can abut against and push the second valve element, so that the second valve element can stretch out through the first opening and abut against and push an external stress piece. When the oil pressure at the first oil port is smaller than the oil pressure at the second oil port, the first valve element and the second valve element are far away from each other, and the second valve element can stretch out through the first opening and abut against an external stress piece. According to the pressure selector valve, a conical surface sealing structure is omitted, the machining difficulty of the hole and the valve element is reduced, the machining cost is saved, and the pressure selector valve has good economical efficiency.

Description

Technical Field

[0001] This invention relates to the field of engineering components, and more particularly to the structure of pressure selector valves, pressure shut-off valves, and hydraulic systems. Background Technology

[0002] A hydraulic system includes power components, actuators, control components, auxiliary components, and hydraulic oil. Hydraulic pumps are common power components, while hydraulic motors are common actuators. Their core function is to convert hydraulic energy into mechanical energy (torque and speed) to drive external equipment to complete rotational motion. Pressure shut-off valves are a type of control component. When the system experiences leakage, abnormal pressure, or sudden danger, the valve quickly closes the oil circuit, blocking power transmission. This prevents damage to the hydraulic pump or motor due to overpressure or abnormal operating conditions, thereby extending the life of components and ensuring the safety of the hydraulic system.

[0003] The pressure shut-off valve structure includes a pressure shut-off valve and a pressure selector valve. The pressure selector valve drives the valve core of the pressure selector valve to move, thereby enabling the control oil circuit of the pressure shut-off valve to switch between the on position, the neutral dynamic balance position, and the shut-off position, thus ensuring the performance of the pressure shut-off valve. Existing pressure selector valves typically include a pressure selector valve sleeve, a pressure selector valve core, a plug, and a taper. The pressure selector valve core is usually a shuttle valve. To ensure the sealing performance between the pressure selector valve core and the valve sleeve, a conical surface usually needs to be machined on the valve sleeve, which is difficult to machine. Furthermore, the plug needs to be equipped with a clearance groove to match the shuttle valve, which also increases the machining difficulty and cost of the plug. Therefore, this increases the scrap rate of parts and the overall machining cost. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure selector valve, a pressure shut-off valve structure, and a hydraulic system, which solves the problems of high processing difficulty and high processing cost of the valve sleeve and valve core in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A pressure selector valve includes a valve sleeve and at least two valve cores. The valve sleeve has an inner cavity, one end of which communicates with the outside through a first opening. The side wall of the valve sleeve has at least two oil ports. The at least two valve cores include a first valve core and a second valve core. The at least two oil ports include a first oil port and a second oil port. Both the first oil port and the second oil port communicate with the inner cavity, and the first oil port is farther away from the first opening than the second oil port. The first valve core and the second valve core are slidably disposed in the inner cavity. When the oil pressure at the first oil port is greater than the oil pressure at the second oil port, the first valve core can push against the second valve core, so that the second valve core can extend through the first opening and push against the external valve core. When the oil pressure at the first oil port is less than the oil pressure at the second oil port, the first valve core and the second valve core move away from each other, and the second valve core can push against the external valve core through the first opening.

[0007] As an optional technical solution for pressure selector valves, each valve core has a plurality of oil reservoirs on its outer peripheral surface, and the plurality of oil reservoirs are arranged parallel to and spaced apart along the axial direction of the valve core.

[0008] As an optional technical solution for pressure selector valves, the oil reservoir has an annular structure.

[0009] As an optional technical solution for pressure selector valves, each valve core is provided with arc-shaped protrusions at both ends along the axial direction.

[0010] As an optional technical solution for pressure selector valves, at least two of the valve cores have the same structure and size.

[0011] As an optional technical solution for the pressure selection valve, the valve sleeve is further provided with a first sealing groove, which is circumferentially arranged on the outer circumferential surface of the valve sleeve and is located between the first oil port and the second oil port.

[0012] The valve sleeve is also provided with a second sealing groove, which is arranged in a ring on the outer circumferential surface of the valve sleeve, and the second sealing groove is located on the side of the second oil port away from the first oil port.

[0013] As an optional technical solution for a pressure selector valve, the valve sleeve is provided with an abutment platform at one end where the first opening is provided, and the valve sleeve is also provided with a third sealing groove, which is located between the first oil port and the abutment platform.

[0014] As an optional technical solution for the pressure selector valve, the valve sleeve is further provided with a second opening, which communicates with the inner cavity and is located at the end of the valve sleeve away from the first opening. The pressure selector valve also includes a sealing plug, which is used to block the second opening and can abut against the first valve core.

[0015] The present invention also adopts the following technical solutions:

[0016] A pressure shut-off valve structure is provided, comprising a pressure shut-off valve and the aforementioned pressure selector valve. The pressure shut-off valve includes a pressure shut-off valve sleeve, a pressure shut-off valve core, a return spring, and a plug. A control chamber is provided within the pressure shut-off valve sleeve, with its two ends communicating with the outside through a third opening and a fourth opening, respectively. The plug blocks the third opening. The pressure shut-off valve core is slidably disposed within the control chamber. The return spring is clamped between the plug and the pressure shut-off valve core. The valve sleeve of the pressure selector valve is connected to the pressure shut-off valve sleeve, and the first opening and the fourth opening are connected, so that the second valve core can push against the pressure shut-off valve core.

[0017] The present invention also adopts the following technical solutions:

[0018] A hydraulic system, the hydraulic system including the pressure shut-off valve structure described above.

[0019] The beneficial effects of this invention are:

[0020] This invention discloses a pressure selector valve, which includes a valve sleeve and at least two valve cores. The valve sleeve has an inner cavity, one end of which communicates with the outside through a first opening. The side wall of the valve sleeve has at least two oil ports. The at least two valve cores include a first valve core and a second valve core, and the at least two oil ports include a first oil port and a second oil port. Both the first oil port and the second oil port communicate with the inner cavity, and the first oil port is farther away from the first opening than the second oil port. The first valve core and the second valve core are slidably disposed in the inner cavity. When the oil pressure at the first oil port is greater than the oil pressure at the second oil port, the first valve core can push against the second valve core, so that the second valve core can extend through the first opening and push against an external force-bearing component. When the oil pressure at the first oil port is less than the oil pressure at the second oil port, the first valve core and the second valve core move away from each other, and the second valve core can extend through the first opening and push against an external force-bearing component. This pressure selector valve uses its first and second ports to connect to two external oil sources. When the pressure of the first oil source is greater than that of the second oil source, the first valve core pushes the second valve core out of the first opening and against the external force-bearing component. When the pressure of the second oil source is greater than that of the first oil source, the first and second valve cores move away from each other, and the second valve core extends out of the first opening and against the external force-bearing component under the action of high-pressure oil. This ensures that the pressure selector valve can output lift normally to the outside even when the pressures of the two oil sources are different. The seal between the valve core and the valve sleeve is achieved through the circumferential surface of the valve core and the inner wall of the inner cavity, thus eliminating the need for a conical sealing structure, reducing the difficulty of hole machining, and saving machining costs. The overall cylindrical valve core also has better machining performance compared to a hollow shuttle valve, reducing machining costs and making the pressure selector valve more economical.

[0021] This invention also discloses a pressure shut-off valve structure, which includes a pressure shut-off valve and the aforementioned pressure selector valve. The pressure shut-off valve includes a pressure shut-off valve sleeve, a pressure shut-off valve core, a return spring, and a plug. A control chamber is provided inside the pressure shut-off valve sleeve, with its two ends communicating with the outside through a third opening and a fourth opening, respectively. The pressure shut-off valve core is slidably disposed in the control chamber. The plug blocks the third opening, and the return spring is clamped between the plug and the pressure shut-off valve core. The valve sleeve of the pressure selector valve is connected to the pressure shut-off valve sleeve, and the first opening and the fourth opening are connected, so that the second valve core can push against the pressure shut-off valve core. This pressure shut-off valve structure, by incorporating the aforementioned pressure selector valve, can reduce the processing cost of the pressure shut-off valve structure while ensuring performance.

[0022] The present invention also discloses a hydraulic system including the aforementioned pressure shut-off valve structure. By incorporating the aforementioned pressure shut-off valve structure, the hydraulic system ensures its operational performance, reduces its cost, and improves its economic efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the pressure selection valve in an embodiment of the present invention, in which the oil pressure at the first port is greater than the oil pressure at the second port.

[0024] Figure 2 This is a schematic diagram of the structure of the pressure selection valve in an embodiment of the present invention, where the oil pressure at the first port is less than the oil pressure at the second port.

[0025] Figure 3 This is a schematic diagram of the valve core structure according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the pressure shut-off valve structure according to an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0028] In the picture:

[0029] 1. Pressure selector valve;

[0030] 10. Valve sleeve; 101. Inner cavity; 102. First opening; 103. First oil port; 104. Second oil port; 105. First sealing groove; 106. Second sealing groove; 107. Third sealing groove; 108. Abutment platform; 109. Second opening;

[0031] 11. First valve core; 111. Oil reservoir; 112. Arc-shaped protrusion;

[0032] 12. Second valve core;

[0033] 13. Sealing plug;

[0034] 14. First sealing element;

[0035] 15. Second sealing element;

[0036] 16. Third sealing element;

[0037] 2. Pressure shut-off valve;

[0038] 21. Pressure shut-off valve sleeve; 211. Control chamber;

[0039] 22. Pressure shut-off valve core;

[0040] 23. Return spring;

[0041] 24. Plug;

[0042] 25. First spring seat;

[0043] 26. Second spring seat;

[0044] 27. Fourth sealing element. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] like Figures 1 to 3As shown, this embodiment provides a pressure selection valve 1, which includes a valve sleeve 10 and at least two valve cores. The valve sleeve 10 is provided with an inner cavity 101, one end of which communicates with the outside through a first opening 102. The side wall of the valve sleeve 10 is provided with at least two oil ports. The at least two valve cores include a first valve core 11 and a second valve core 12, and the at least two oil ports include a first oil port 103 and a second oil port 104. Both the first oil port 103 and the second oil port 104 communicate with the inner cavity 101. The first valve core 11... Both the first valve core 11 and the second valve core 12 are slidably disposed in the inner cavity 101. When the oil pressure at the first oil port 103 is greater than the oil pressure at the second oil port 104, the first valve core 11 can push against the second valve core 12 so that the second valve core 12 can extend through the first opening 102 and push against the external force-bearing component. When the oil pressure at the first oil port 103 is less than the oil pressure at the second oil port 104, the first valve core 11 and the second valve core 12 move away from each other, and the second valve core 12 can extend through the first opening 102 and push against the external force-bearing component.

[0050] Specifically, in this embodiment, as Figure 1 and Figure 2 As shown, taking a pressure selection valve 1 comprising two valve cores and two oil ports on the valve sleeve 10 as an example, the two valve cores include a first valve core 11 and a second valve core 12, and the two oil ports include a first oil port 103 and a second oil port 104. The first oil port 103 and the second oil port 104 are used to connect to a first oil source and a second oil source, respectively. When the pressure of the first oil source is greater than the pressure of the second oil source, the first valve core 11 pushes the second valve core 12 out of the first opening 102 and pushes against the external force-bearing component. When the pressure of the second oil source is greater than the pressure of the first oil source, the first valve core 11... The second valve core 12 is far apart from the first valve core 12. Under the action of high pressure oil, the second valve core 12 extends from the first opening 102 and pushes against the external force-bearing component, thereby ensuring the performance of the pressure selection valve 1. The seal between the valve core and the valve sleeve 10 is achieved through the circumferential surface of the valve core and the inner wall of the inner cavity 101. Therefore, the conical sealing structure is eliminated, the machining difficulty of the hole is reduced, and the machining cost is saved. Moreover, the overall cylindrical valve core has better machining performance than the hollow shuttle valve, which reduces the machining cost and makes the pressure selection valve 1 more economical.

[0051] Alternatively, in another embodiment, the number of oil ports and the number of valve cores can be specifically set according to actual use, as long as multiple oil ports are set to correspond one-to-one with multiple valve cores, and no specific restrictions are imposed here.

[0052] Furthermore, such as Figure 3As shown, each valve core has a plurality of oil reservoirs 111 on its outer peripheral surface, and the plurality of oil reservoirs 111 are arranged parallel to and spaced apart along the axial direction of the valve core. Specifically, in this embodiment, the outer peripheral surface of the first valve core 11 has a plurality of first oil reservoirs 111, and the plurality of first oil reservoirs 111 are arranged at equal intervals along the axial direction of the first valve core 11; the outer peripheral surface of the second valve core 12 has a plurality of second oil reservoirs 111, and the plurality of second oil reservoirs 111 are arranged at equal intervals along the axial direction of the second valve core 12; when the first oil source inputs hydraulic oil into the inner cavity 101 through the first oil port 103 and / or the second oil source inputs hydraulic oil into the inner cavity 101 through the second oil port 104, the hydraulic oil in the inner cavity 101 can pass through the gap between the outer peripheral wall of the first valve core 11 and the inner wall of the inner cavity 101, as well as the gap between the outer peripheral wall of the second valve core 12 and the inner wall of the inner cavity 101. The gap between the inner walls of the inner cavity 101 enters the first oil reservoir 111 and the second oil reservoir 111 to lubricate the first valve core 11, the second valve core 12 and the valve sleeve 10. This reduces the friction between the first valve core 11 and the valve sleeve 10 and between the second valve core 12 and the valve sleeve 10. This ensures the smooth movement of the first valve core 11 and the second valve core 12 relative to the valve sleeve 10, reduces wear on the first valve core 11, the second valve core 12 and the valve sleeve 10, and avoids excessive heat generated during the relative movement of the first valve core 11 and the valve sleeve 10 and the second valve core 12 and the valve sleeve 10. This ensures the performance of the pressure selection valve 1.

[0053] Specifically, in this embodiment, such as Figure 3 As shown, the first valve core 11 has three first oil reservoirs 111 on its outer peripheral surface, and the three first oil reservoirs 111 are equally spaced. The second valve core 12 also has three second oil reservoirs 111 on its outer peripheral surface, and the three second oil reservoirs 111 are also equally spaced. In other embodiments, the number and position of the first oil reservoirs 111 of the first valve core 11 and the number and position of the second oil reservoirs 111 of the second valve core 12 can be specifically set according to actual use, and no specific restrictions are made here.

[0054] Furthermore, such as Figure 3 As shown, the oil reservoir 111 has an annular structure. Specifically, in this embodiment, both the first oil reservoir 111 on the first valve core 11 and the second oil reservoir 111 on the second valve core 12 have an annular structure. This allows a uniform oil film to be formed in both the gap between the first valve core 11 and the valve sleeve 10 and the gap between the second valve core 12 and the valve sleeve 10, thereby improving the lubrication effect. Furthermore, this design can reduce the processing difficulty of the first valve core 11 and the second valve core 12, and reduce production costs.

[0055] Furthermore, such as Figure 3As shown, each valve core has an arc-shaped protrusion 112 at both ends along the axial direction. Specifically, in this embodiment, the first valve core 11 and the second valve core 12 both have arc-shaped protrusions 112 at both ends along the axial direction. When the first valve core 11 pushes against the second valve core 12, the arc-shaped protrusions 112 of the first valve core 11 and the arc-shaped protrusions 112 of the second valve core 12 abut against each other, creating a gap between the first valve core 11 and the second valve core 12. This prevents the first valve core 11 and the second valve core 12 from being sucked together under oil pressure, ensuring that the first valve core 11 and the second valve core 12 can disengage normally after the oil pressure at the first oil port 103 drops. At the same time, the arc-shaped protrusions 112 of the second valve core 12 push against the external force-bearing component, which also ensures that there is a gap between the second valve core 12 and the external force-bearing component, preventing the second valve core 12 and the external force-bearing component from being sucked together under oil pressure, ensuring the normal disengagement of the second valve core 12 and the external force-bearing component, and thus ensuring the performance of the pressure selection valve 1.

[0056] Furthermore, at least two valve cores have the same structure and size. Specifically, in this embodiment, the structure and size of the first valve core 11 and the second valve core 12 are exactly the same, thus enabling the processing of multiple valve cores through a single machining process, reducing the production cost of the valve cores, and consequently reducing the overall complexity of the pressure selection valve 1.

[0057] Furthermore, such as Figure 1 As shown, the valve sleeve 10 is also provided with a first sealing groove 105, which is arranged in a ring on the outer peripheral surface of the valve sleeve 10 and is located between the first oil port 103 and the second oil port 104; the valve sleeve 10 is also provided with a second sealing groove 106, which is arranged in a ring on the outer peripheral surface of the valve sleeve 10 and is located on the side of the second oil port 104 away from the first oil port 103. Specifically, in this embodiment, when the valve sleeve 10 is installed on the mounted component, a first sealing element 14 is placed in the first sealing groove 105. The first sealing element 14 can seal the gap between the first oil port 103 and the second oil port 104, ensuring that the first oil port 103 and the second oil port 104 are independent of each other, and avoiding oil leakage that could lead to oil pressure failure between the first oil port 103 and the second oil port 104. A second sealing element 15 is placed in the second sealing groove 106 on the valve sleeve 10. The second sealing element 15 can seal the gap between the second oil port 104 and the mounted component, preventing oil in the second oil port 104 from leaking through the gap between the valve sleeve 10 and the mounted component, thereby ensuring the oil pressure at the second oil port 104 and thus ensuring the performance of the selected pressure valve.

[0058] Furthermore, such as Figure 1As shown, the valve sleeve 10 has a first opening 102 at one end with an abutment platform 108. The valve sleeve 10 also has a third sealing groove 107, which is located between the first oil port 103 and the abutment platform 108. Specifically, in this embodiment, when the valve sleeve 10 is connected to the housing with an external force-bearing component, the abutment platform 108 can abut against the housing, thereby ensuring the reliability of the installation position. A third sealing element 16 is placed in the third sealing groove 107 of the valve sleeve 10. The third sealing element 16 can seal the gap between the housing and the valve sleeve 10, thereby preventing oil leakage in the inner cavity 101, ensuring that the second valve core 12 can normally push against the external force-bearing component, and ensuring the performance of the pressure selection valve 1.

[0059] Furthermore, such as Figure 1 As shown, the valve sleeve 10 is also provided with a second opening 109, which communicates with the inner cavity 101 and is located at the end of the valve sleeve 10 away from the first opening 102. The pressure selection valve 1 also includes a sealing plug 13, which is used to block the second opening 109 and can abut against the first valve core 11. Specifically, in this embodiment, the provision of the second opening 109 facilitates the processing of the inner cavity 101 of the valve sleeve 10, thereby reducing the processing difficulty of the inner cavity 101. The sealing plug 13 can block the second opening 109, ensuring the sealing performance of the inner cavity 101. The sealing plug 13 is used to abut against the first valve core 11. Compared with the prior art where the sealing plug 13 needs to be provided with a clearance space to avoid the shuttle valve, the processing difficulty can be significantly reduced, thereby reducing the cost of the parts. On the other hand, the end of the valve sleeve 10 with the first opening 102 is connected to the housing with the external force-bearing component. When the first valve core 11 or the second valve core 12 has a problem, the sealing plug 13 at the second opening 109 can be removed to repair or replace the first valve core 11 or the second valve core 12, which improves the convenience of use.

[0060] Preferably, such as Figure 3 As shown, the end of the sealing plug 13 facing the first valve core 11 is also provided with an arc-shaped protrusion 112, which is not specifically limited here.

[0061] like Figure 4 and Figure 5As shown, this embodiment also provides a pressure shut-off valve structure, which includes a pressure shut-off valve 2 and the aforementioned pressure selector valve 1. The pressure shut-off valve 2 includes a pressure shut-off valve sleeve 21, a pressure shut-off valve core 22, a return spring 23, and a plug 24. A control chamber 211 is provided inside the pressure shut-off valve sleeve 21. The two ends of the control chamber 211 are connected to the outside through a third opening and a fourth opening, respectively. The plug 24 blocks the third opening. The pressure shut-off valve core 22 is slidably disposed in the control chamber 211. The return spring 23 is sandwiched between the plug 24 and the pressure shut-off valve core 22. The valve sleeve 10 of the pressure selector valve 1 is connected to the pressure shut-off valve sleeve 21, and the first opening 102 and the fourth opening are connected, so that the second valve core 12 can push against the pressure shut-off valve core 22. This pressure shut-off valve structure, by providing the aforementioned pressure selector valve 1, can reduce the processing cost of the pressure shut-off valve structure while ensuring performance.

[0062] Furthermore, such as Figure 4 and Figure 5 As shown, in this embodiment, the valve sleeve 10 of the pressure selector valve 1 is inserted into the control cavity 211 of the pressure shut-off valve sleeve 21, and the end face of the pressure shut-off valve sleeve 21 abuts against the abutment platform 108 of the valve sleeve 10. The third sealing member 16 is sandwiched between the bottom of the third sealing groove 107 and the inner wall of the control cavity 211, and is used to seal the gap between the valve sleeve 10 of the pressure selector valve 1 and the pressure shut-off valve sleeve 21, thereby ensuring the sealing performance of the pressure shut-off valve structure.

[0063] Optionally, such as Figure 4 As shown in this embodiment, in order to ensure the stability of the setting position of the reset spring 23, a first spring seat 25 is provided on the plug 24 and a second spring seat 26 is provided on the pressure shut-off valve core 22. The two ends of the reset spring 23 are respectively limited by the first spring seat 25 and the second spring seat 26, thereby ensuring the performance of the reset spring 23.

[0064] Optionally, such as Figure 4 As shown, in this embodiment, a fourth sealing ring is provided between the plug 24 and the pressure shut-off valve sleeve 21 to ensure the sealing performance between the plug 24 and the pressure shut-off valve sleeve 21. This setting is a common setting in the prior art and will not be described in detail here.

[0065] The following is based on Figure 4The working process of the pressure shut-off valve structure is described. When the oil pressure between the first port 103 and the second port 104 of the pressure selection valve 1 is in equilibrium, the pressure shut-off valve core 22 is in the lower position under the action of the return spring 23, thus realizing the conduction function of the pressure shut-off valve 2. Subsequently, the second valve core 12 and the first valve core 11 are in their initial positions under the action of the pressure shut-off valve core 22 and their own gravity. When the oil pressure at the first port 103 is greater than the oil pressure at the second port 104, the first valve core 11 moves towards the second valve core 12 under the push of the hydraulic oil at the first port 103, and pushes the second valve core 12 to move towards the pressure shut-off valve core 22. The pressure shut-off valve core 22 is pushed to the neutral or upper position to achieve the balancing or shut-off function of the pressure shut-off valve 2. On the other hand, when the oil pressure at the second port 104 is greater than the oil pressure at the first port 103, the first valve core 11 moves away from the second valve core 12 under the push of the hydraulic oil at the second port 104 until the first valve core 11 comes into contact with the sealing plug 13. At the same time, the second valve core 12 moves away from the first valve core 11 under the push of the hydraulic oil at the second port 104 until the pressure shut-off valve core 22 is pushed to the neutral or upper position to achieve the balancing or shut-off function of the pressure shut-off valve 2. This pressure shut-off valve structure, by incorporating the aforementioned pressure selection valve 1, can achieve either a balancing or shut-off function for the pressure shut-off valve 2 in two scenarios: when the oil pressure at the first port 103 is greater than the oil pressure at the second port 104, and when the oil pressure at the second port 104 is greater than the oil pressure at the first port 103. This provides good flexibility in use. Furthermore, the pressure selection valve 1 is easy to manufacture and has low manufacturing costs, thus making this pressure shut-off valve structure economical.

[0066] This embodiment also provides a hydraulic system including the aforementioned pressure shut-off valve structure. By incorporating this pressure shut-off valve structure, the hydraulic system ensures its operational performance, reduces its cost, and improves its economic efficiency.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A pressure selector valve, characterized in that, The pressure selection valve includes a valve sleeve (10) and at least two valve cores. The valve sleeve (10) has an inner cavity (101), one end of which communicates with the outside through a first opening (102). The side wall of the valve sleeve (10) has at least two oil ports. The at least two valve cores include a first valve core (11) and a second valve core (12). The at least two oil ports include a first oil port (103) and a second oil port (104). Both the first oil port (103) and the second oil port (104) communicate with the inner cavity (101), and the first oil port (103) is farther from the first opening (102) than the second oil port (104). The first valve core (11) and the second valve core (12) are slidably disposed in the inner cavity (101) in sequence. When the oil pressure at the first oil port (103) is greater than the oil pressure at the second oil port (104), the first valve core (11) can push against the second valve core (12) so that the second valve core (12) can extend through the first opening (102) and push against the external valve core. When the oil pressure at the first oil port (103) is less than the oil pressure at the second oil port (104), the first valve core (11) and the second valve core (12) move away from each other, and the second valve core (12) can push against the external valve core through the first opening (102).

2. The pressure selector valve according to claim 1, characterized in that, Each valve core has a plurality of oil reservoirs (111) on its outer peripheral surface, and the plurality of oil reservoirs (111) are arranged parallel to and spaced apart along the axial direction of the valve core.

3. The pressure selection valve according to claim 2, characterized in that, The oil storage tank (111) has a ring structure.

4. The pressure selector valve according to claim 1, characterized in that, Each valve core has arc-shaped protrusions (112) at both ends along the axial direction.

5. The pressure selector valve according to claim 1, characterized in that, At least two of the valve cores have the same structure and size.

6. The pressure selector valve according to claim 1, characterized in that, The valve sleeve (10) is also provided with a first sealing groove (105), which is arranged in a ring on the outer circumferential surface of the valve sleeve (10) and is located between the first oil port (103) and the second oil port (104). The valve sleeve (10) is also provided with a second sealing groove (106), which is arranged in a ring on the outer circumferential surface of the valve sleeve (10) and is located on the side of the second oil port (104) away from the first oil port (103).

7. The pressure selector valve according to any one of claims 1-6, characterized in that, The valve sleeve (10) is provided with an abutment platform (108) at one end of the first opening (102). The valve sleeve (10) is also provided with a third sealing groove (107), and the third sealing groove (107) is located between the first oil port (103) and the abutment platform (108).

8. The pressure selector valve according to claim 7, characterized in that, The valve sleeve (10) is also provided with a second opening (109), which communicates with the inner cavity (101) and is located at the end of the valve sleeve (10) away from the first opening (102). The pressure selection valve also includes a sealing plug (13), which is used to block the second opening (109) and can abut against the first valve core (11).

9. A pressure shut-off valve structure, characterized in that, The pressure shut-off valve structure includes a pressure shut-off valve (2) and a pressure selection valve as described in any one of claims 1-8. The pressure shut-off valve (2) includes a pressure shut-off valve sleeve (21), a pressure shut-off valve core (22), a return spring (23), and a plug (24). A control chamber (211) is provided inside the pressure shut-off valve sleeve (21). The two ends of the control chamber (211) are connected to the outside through a third opening and a fourth opening, respectively. The plug (24) blocks the third opening. The pressure shut-off valve core (22) is slidably disposed in the control chamber (211). The return spring (23) is sandwiched between the plug (24) and the pressure shut-off valve core (22). The valve sleeve (10) of the pressure selection valve is connected to the pressure shut-off valve sleeve (21), and the first opening (102) and the fourth opening are connected, so that the second valve core (12) can push against the pressure shut-off valve core (22).

10. A hydraulic system, characterized in that, The hydraulic system includes the pressure shut-off valve structure as described in claim 9.

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