Stop valve

Abstract

The present invention provides a stop valve, the stop valve comprising: a valve body, a valve core, a reset member and a switch assembly, the valve body having a valve cavity, the valve cavity comprising an oil inlet section and an oil drain section, the valve body further comprising a liquid inlet, a liquid outlet and a pressure relief port, each of the liquid inlet and the liquid outlet being connected to the oil inlet section, the pressure relief port being connected to the oil drain section, the valve core being movably arranged in the valve cavity, at least a portion of the valve core being located between the oil inlet section and the oil drain section, the valve core being able to block the liquid inlet when being located at a first position so as to block the liquid inlet and the liquid outlet, the valve core being able to release the liquid inlet when being located at a second position so as to conduct the liquid inlet and the liquid outlet, the valve core having a communication hole connecting the liquid inlet and the oil drain section, the pressure relief port being used to connect the oil drain section and the oil drain tank, the reset member being used to drive the valve core to move from the second position to the first position, the switch assembly being used to open or close the pressure relief port so as to release or block the valve core from the liquid inlet. The stop valve of the present invention has the advantage of being easy to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a stop valve. Background Art

[0002] The stop valve in the related technology usually requires an operator to manipulate the stop valve handle to control the on and off of the stop valve. As the flow and pressure of the pipeline where the stop valve is located increase, the friction between the stop valve ball head and the valve seat increases, the operating torque of the handle increases, and the operation is difficult. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a stop valve, which has the advantage of being easy to operate.

[0005] The stop valve of the embodiment of the present invention comprises: a valve body, the valve body having a valve cavity, the valve cavity comprising an oil inlet section and an oil drain section, the valve body further comprising a liquid inlet, a liquid outlet and a pressure relief port, each of the liquid inlet and the liquid outlet is communicated with the oil inlet section, and the pressure relief port is communicated with the oil drain section; a valve core, the valve core is movably arranged in the valve cavity between a first position and a second position, at least a part of the valve core is located between the oil inlet section and the oil drain section, the valve core is able to block the liquid inlet when it is in the first position so as to block the liquid inlet and the liquid outlet, and is able to release the liquid inlet when it is in the second position a liquid port so as to conduct the liquid inlet and the liquid outlet, the valve core has a communicating hole, the communicating hole connects the liquid inlet and the oil drain section, the radial dimension of the communicating hole is smaller than the radial dimension of the liquid inlet, and the pressure relief port is used to connect the oil drain section and the oil drain tank; a reset member, the reset member is arranged in one of the oil inlet section and the oil drain section, the reset member is used to drive the valve core to move from the second position to the first position; and a switch assembly, the switch assembly is used to open or close the pressure relief port, so that the valve core moves between the first position and the second position, thereby allowing the valve core to release or block the liquid inlet.

[0006] The stop valve of the embodiment of the present invention can realize the movement of the valve core between the first position and the second position by controlling the opening and closing of the switch assembly, so that the valve core releases or blocks the liquid inlet.

[0007] Therefore, the stop valve according to the embodiment of the present invention has the advantage of being easy to operate.

[0008] In some embodiments, the switch assembly includes a first switch element, the first switch element having a first oil inlet and a first oil outlet, the first oil inlet is connected to the pressure relief port, the first oil outlet is used to connect to the oil drain tank, the first switch element includes a first detection part and a second detection part, when the pressure detected by the first detection part is greater than the pressure detected by the second detection part, the first oil inlet is connected to the first oil outlet, so that the oil enters the first switch element through the first oil inlet and is discharged from the first oil outlet to the oil drain tank.

[0009] In some embodiments, the first detection portion has a first detection surface, the second detection portion has a second detection surface, and a cross-sectional area of ​​the first detection surface is greater than a cross-sectional area of ​​the second detection surface.

[0010] In some embodiments, the switch assembly further comprises a second switch member, the second switch member having an oil drain port, a second oil inlet port and a second oil outlet port, the second oil inlet port being connected to the liquid inlet port, the second oil outlet port being connected to the first detection portion, so that the oil discharged from the second oil outlet port acts on the first detection surface, the second detection portion being connected to the oil drain section, so that the oil in the oil drain section acts on the second detection surface,

[0011] When the second switch is opened, the second oil inlet is connected to the second oil outlet, so that oil can flow into the second switch through the second oil inlet and be discharged from the second oil outlet to act on the first detection surface, so that the first detection part detects the pressure on the first detection surface, thereby making the pressure detected by the first detection part greater than the pressure detected by the second detection part.

[0012] When the second switch is closed, the second oil outlet is connected to the oil drain port, so that the oil in the first detection part passes through the second oil outlet and is discharged from the oil drain port, thereby making the pressure on the first detection surface lower than the pressure on the second detection surface.

[0013] In some embodiments, the second switch member further comprises a first control switch, the first control switch is used to connect or block the second oil inlet and the second oil outlet, and the first control switch is used to connect or block the second oil outlet and the oil drain port.

[0014] When the first control switch is turned on, the first control switch connects the second oil inlet and the second oil outlet, and blocks the second oil outlet and the oil drain, so that the oil in the oil inlet flows into the first detection part through the second switch element and acts on the first detection surface, so that the first detection detects the pressure on the first detection surface.

[0015] When the first control switch is closed, the first control switch blocks the second oil inlet and the second oil outlet, and the first control switch connects the second oil outlet and the oil drain port, so that the oil in the first detection part passes through the second oil outlet and is discharged from the oil drain port, thereby making the pressure on the first detection surface lower than the pressure on the second detection surface.

[0016] In some embodiments, the reset member is disposed in the oil inlet section, and the reset member always has a tendency to drive the valve core to move from the second position to the first position.

[0017] In some embodiments, the reset member is disposed in the oil leakage section, and the reset member always has a tendency to drive the valve core to move from the second position to the first position.

[0018] In some embodiments, the valve core includes a placement groove, the placement groove is arranged toward the oil leakage section, and a portion of the reset member is placed in the placement groove.

[0019] In some embodiments, a radial dimension of at least a portion of the valve core is larger than a radial dimension of the liquid inlet.

[0020] In some embodiments, the valve core has a sealing portion, which is arranged adjacent to the liquid inlet so that when the valve core moves between the first position and the second position, the liquid inlet and the liquid outlet are blocked or connected, and the radial dimension of the sealing portion gradually decreases along the direction from the valve core to the liquid inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a stop valve according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of a valve body of a stop valve according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Valve body 1; oil inlet section 11; oil discharge section 12; liquid inlet 13; liquid outlet 14; pressure relief port 15;

[0025] Valve core 2; communicating hole 21; first contact surface 22; second contact surface 23; annular surface 24; blocking portion 25;

[0026] Reset part 3;

[0027] Switch assembly 4; first switch element 41; first detection unit 411; second detection unit 412; first oil inlet 413; first oil outlet 414; second switch element 42; oil drain port 421; second oil inlet 422; second oil outlet 423; second control unit 424;

[0028] Drain tank 5. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figure 1 and Figure 2 As shown, the stop valve according to the embodiment of the present invention comprises: a valve body 1 , a valve core 2 , a reset member 3 and a switch assembly 4 .

[0031] like Figure 2 As shown, the valve body 1 has a valve cavity, which includes an oil inlet section 11 and an oil drain section 12. The valve body 1 also includes a liquid inlet 13, a liquid outlet 14 and a pressure relief port 15. Each of the liquid inlet 13 and the liquid outlet 14 is in communication with the oil inlet section 11, and the pressure relief port 15 is in communication with the oil drain section 12. The valve core 2 is movably disposed in the valve cavity between a first position and a second position, and at least a portion of the valve core 2 is located between the oil inlet section 11 and the oil drain section 12. When the valve core 2 is in the first position, the liquid inlet 13 can be blocked so as to block the liquid inlet 13 and the liquid outlet 14. When the valve core 2 is in the second position, the liquid inlet 13 can be released so as to connect the liquid inlet 13 and the liquid outlet 14.

[0032] Specifically, Figure 2 As shown, the valve core 2 divides the valve cavity into two parts (i.e., the oil inlet section 11 and the oil leakage section 12), and the oil inlet section 11 is located below the oil leakage section 12. The peripheral wall surface of the valve core 2 is sealedly connected to the wall surface of the valve cavity, and the valve core 2 is movable between a first position and a second position, wherein the first position is located below the second position.

[0033] The valve core 2 has a connecting hole 21, which connects the liquid inlet 13 and the oil drain section 12. The radial dimension of the connecting hole 21 is smaller than the radial dimension of the liquid inlet 13. The pressure relief port 15 is used to connect the oil drain section 12 and the oil drain tank 5. When the pressure relief port 15 is opened, the oil in the oil drain section 12 can flow out to the oil drain tank 5 through the pressure relief port 15. That is to say, when the pressure relief port 15 is opened, the pressure in the oil drain section 12 drops.

[0034] Specifically, the oil in the liquid inlet 13 can flow into the oil leakage section 12 through the connecting hole 21. The aperture size of the connecting hole 21 can affect the flow rate of the oil flowing into the oil leakage section 12, that is, the larger the aperture of the connecting hole 21, the faster the flow rate of the oil flowing into the oil leakage section 12.

[0035] It can be understood that the valve core 2 also includes a first contact surface 22 and a second contact surface 23, the first contact surface 22 is the lower surface of the valve core 2, and the second contact surface 23 is the upper surface of the valve core 2. When the valve core 2 is in the first position, the valve core 2 blocks the liquid inlet 13, and the oil in the liquid inlet 13 acts on the first contact surface 22, so that the first contact surface 22 has a certain pressure. In addition, the oil in the liquid inlet 13 can flow into the oil drain section 12 through the connecting hole 21, and the oil in the oil drain section 12 acts on the second contact surface 23, so that the second contact surface 23 has a certain pressure. If the pressure on the first contact surface 22 is greater than that on the second contact surface 23,

[0036] The reset member 3 is disposed in one of the oil inlet section 11 and the oil drain section 12 , and is used to drive the valve core 2 to move from the second position to the first position.

[0037] Optionally, the reset member 3 is arranged in the oil inlet section 11, and the reset member 3 always has the tendency to drive the valve core 2 to move from the second position to the first position; or, the reset member 3 is arranged in the oil drain section 12, and the reset member 3 always has the tendency to drive the valve core 2 to move from the second position to the first position.

[0038] It can be understood that when the reset member 3 is arranged in the oil inlet section 11, the reset member 3 applies a pulling force downward to the valve core 2 so that the valve core 2 has a tendency to move toward the first position when in the second position; when the reset member 3 is arranged in the oil drain section 12, the reset member 3 applies a pushing force downward to the valve core 2 so that the valve core 2 has a tendency to move toward the first position when in the second position.

[0039] Preferably, the reset member 3 is arranged in the oil leakage section 12. When the valve core 2 is in the first position (i.e., the valve core 2 blocks the liquid inlet 13) and the pressure relief port 15 is closed, the oil in the liquid inlet 13 flows into the oil leakage section 12 through the connecting port. At this time, the second contact surface 23 of the valve core 2 is subjected to the thrust of the reset member 3 (the thrust direction is vertically downward) and the liquid pressure in the oil leakage section 12 (the pressure direction is vertically downward), and the first contact surface 22 of the valve core 2 is subjected to the liquid pressure of the oil in the liquid inlet 13 (the pressure direction is vertically upward). The downward force on the valve core 2 is greater than the upward force, and the valve core 2 is in the first position to block the liquid inlet 13. When the pressure relief port 15 is opened, the oil leakage section 12 is connected with the oil leakage tank 5, the pressure in the oil leakage section 12 is reduced, and the downward force on the valve core 2 is less than the upward force, and the valve core 2 moves upward from the first position to the second position, and the liquid inlet 13, the oil inlet section 11 and the liquid outlet 14 are connected to realize the liquid discharge function.

[0040] It should be noted that the reset member 3 may be a spring, or a component with elasticity or reset function, such as a C-shaped spring.

[0041] Preferably, the reset element 3 is a spring.

[0042] The switch assembly 4 is used to open or close the pressure relief port 15 so that the valve core 2 moves between the first position and the second position, thereby causing the valve core 2 to release or block the liquid inlet 13 .

[0043] It can be understood that when the switch assembly 4 is controlled to open the pressure relief port 15 and the pressure in the oil leakage section 12 is reduced, the pressure on the first contact surface 22 of the valve core 2 is greater than the pressure on the second contact surface 23, so that the valve core 2 moves from the first position to the second position, and the liquid inlet 13 is connected to the liquid outlet 14 to realize the liquid discharge function.

[0044] That is to say, the switch assembly 4 can be a manually controlled switch. Since the flow pressure near the pressure relief port 15 is relatively small, the switch assembly 4 can be easily opened or closed as a manually controlled switch, which is convenient for the operator to operate. Alternatively, the switch assembly 4 can be an electrically controlled switch. In other words, the electrically controlled switch can be used to remotely control the opening or closing of the pressure relief port 15, thereby realizing the drainage function.

[0045] Therefore, the stop valve according to the embodiment of the present invention has the advantage of being easy to operate.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the switch assembly 4 includes a first switch component 41, which is a two-position three-way reversing valve controlled by liquid pressure. The first switch component 41 has a first oil inlet 413 and a first oil outlet 414. The first oil inlet 413 is connected to the pressure relief port 15, and the first oil outlet 414 is used to connect to the oil drain tank 5. The first switch component 41 includes a first detection part 411 and a second detection part 412. When the pressure detected by the first detection part 411 is greater than the pressure detected by the second detection part 412, the first oil inlet 413 is connected to the first oil outlet 414, so that the oil enters the first switch component 41 through the first oil inlet 413 and is discharged to the oil drain tank 5 from the first oil outlet 414.

[0047] Specifically, Figure 1 and Figure 2 As shown, the first oil inlet 413 can be connected to the pressure relief port 15 through a pipeline, and the first oil outlet 414 can also be connected to the oil relief tank 5 through a pipeline. The first detection part 411 and the second detection part 412 can be applied with different pressures from the outside, so that the pressure detected by the first detection part 411 is greater than the pressure detected by the second detection part 412.

[0048] In some embodiments, Figure 1 and Figure 2 As shown, the first detection portion 411 has a first detection surface, the second detection portion 412 has a second detection surface, and the cross-sectional area of ​​the first detection surface is greater than the cross-sectional area of ​​the second detection surface.

[0049] Optionally, both the first detection part 411 and the second detection part 412 are provided with pressure sensors, and the pressure on the first detection surface can be detected by the pressure sensor on the first detection part 411, and the pressure on the second detection surface can be detected by the pressure sensor on the second detection part 412.

[0050] It can be understood that when different pressures are applied to the first detection surface and the second detection surface, the pressure on the first detection surface is greater than the pressure on the second detection surface, and the first oil inlet 413 is connected to the first oil outlet 414, then the oil enters the first switch member 41 through the first oil inlet 413 and is discharged from the first oil outlet 414 to the oil drain tank 5, so that the pressure in the oil drain section 12 is reduced. When the pressure on the first contact surface 22 of the valve core 2 is greater than the pressure on the second contact surface 23, the valve core 2 can move from the first position to the second position, thereby realizing the drainage function.

[0051] In some embodiments, the switch assembly 4 also includes a second switch component 42, which is a two-position three-way electromagnetic reversing valve. The second switch component 42 has an oil drain port 421, a second oil inlet port 422 and a second oil outlet port 423. The second oil inlet port 422 is connected to the liquid inlet port 13, and the second oil outlet port 423 is connected to the first detection part 411, so that the oil discharged from the second oil outlet port 423 acts on the first detection surface, and the second detection part 412 is connected to the oil drain section 12, so that the oil in the oil drain section 12 acts on the second detection surface.

[0052] It can be understood that the second oil inlet 422 is connected to the liquid inlet 13 through a pipeline, and the second oil outlet 423 is connected to the first detection part 411 through a pipeline. The first detection part 411 has a first detection cavity, and the side wall of the first detection cavity forms a first detection surface. Then the oil entering the first detection cavity can act on the first detection surface, that is, the pressure on the first detection surface is the hydraulic pressure of the oil in the first detection cavity acting on the first detection surface. Similarly, the second detection part 412 has a second detection cavity, and the side wall of the second detection cavity forms a second detection surface. The pressure on the second detection surface is the hydraulic pressure of the oil in the second detection cavity acting on the second detection surface.

[0053] When the second switch 42 is opened, the second oil inlet 422 is connected to the second oil outlet 423, so that the oil can flow into the second switch 42 through the second oil inlet 422 and be discharged from the second oil outlet 423 to act on the first detection surface, so that the first detection part 411 detects the pressure on the first detection surface, thereby making the pressure detected by the first detection part 411 greater than the pressure detected by the second detection part 412. When the second switch 42 is closed, the second oil outlet 423 is connected to the oil drain port 421, so that the oil in the first detection part 411 passes through the second oil outlet 423 and is discharged from the oil drain port 421, thereby making the pressure on the first detection surface less than the pressure on the second detection surface.

[0054] That is to say, when the second switch 42 is opened, the second oil inlet 422 is connected to the second oil outlet 423, and the oil in the liquid inlet 13 flows into the first detection chamber through the second oil inlet 422 and the second oil outlet 423 in turn and acts on the first detection surface. At this time, the oil in the liquid inlet 13 also flows into the second detection chamber through the connecting hole 21, the oil leakage section 12 and the pressure relief port 15 in turn and acts on the second detection surface. Since the oil in the first detection chamber and the second detection chamber are both connected to the oil in the liquid inlet 13, the liquid pressure in the first detection chamber and the second detection chamber is equal to the liquid pressure in the liquid inlet 13. In addition, the cross-sectional area of ​​the first detection surface is larger than the cross-sectional area of ​​the second detection surface. According to the pressure calculation formula, it is concluded that the pressure on the first detection surface is greater than the pressure on the second detection surface. When the pressure on the first detection surface is greater than the pressure on the second detection surface, the first switch element 41 is opened. The first switch element 41 is opened to connect the first oil inlet 413 and the first oil outlet 414. The oil in the pressure relief section flows into the oil drain tank 5 through the pressure relief port 15, the first oil inlet 413 and the first oil outlet 414 in sequence, thereby reducing the pressure in the oil drain section 12. At this time, the valve core 2 moves from the first position to the second position to realize the liquid discharge function.

[0055] In other words, the force on the first detection surface is the hydraulic pressure of the oil entering the first detection chamber, and the force on the second detection surface is the hydraulic pressure of the oil entering the second detection chamber, and the oil entering the first detection chamber and the oil entering the second detection chamber both come from the oil in the liquid inlet 13. Therefore, the stop valve of the embodiment of the present invention does not need to be provided with a component for applying an external force, and the pressure on the first detection surface can be made greater than the pressure on the second detection surface by the cooperation of the stop valve's own structure and the oil in the liquid inlet 13, thereby realizing the opening and closing of the stop valve.

[0056] Optionally, the first switch member 41 includes a first control unit and a second control switch, the second control switch is used to connect and block the first oil inlet 413 and the first oil outlet 414, when the second control switch is turned on, the second control switch connects the first oil inlet 413 and the first oil outlet 414; when the second control switch is turned off, the second control switch blocks the first oil inlet 413 and the first oil outlet 414. The first control unit can receive a control signal, that is, when the pressure on the first detection surface is greater than the pressure on the second detection surface, the first control unit can receive an opening signal, and the first control unit can control the second control switch to open; when the pressure on the first detection surface is less than the pressure on the second detection surface, the first control unit can receive a closing signal, and the first control unit can control the second control switch to close.

[0057] In some embodiments, the second switch element 42 further includes a first control switch (not shown in the figure), the first control switch is used to connect or block the second oil inlet 422 and the second oil outlet 423, and the first control switch is used to connect or block the second oil outlet 423 and the oil drain port 421. When the first control switch is turned on, the first control switch connects the second oil inlet 422 and the second oil outlet 423, and the first control switch blocks the second oil outlet 423 and the oil drain port 421, so that the oil in the liquid inlet 13 flows into the first detection part 411 through the second switch element 42 and acts on the first detection surface, so that the first detection detects the pressure on the first detection surface. When the first control switch is turned off, the first control switch blocks the second oil inlet 422 and the second oil outlet 423, and the first control switch connects the second oil outlet 423 and the oil drain port 421, so that the oil in the first detection part 411 passes through the second oil outlet 423 and is discharged from the oil drain port 421, so that the pressure on the first detection surface is less than the pressure on the second detection surface.

[0058] Specifically, the second switch element 42 also includes a second control unit 424, which can receive a control signal so as to control the first control switch to open or close through the control signal, thereby avoiding direct operation by the operator, realizing remote control, and reducing the operator's work intensity.

[0059] Optionally, the second switch element 42 is a solenoid valve.

[0060] In some embodiments, at least a portion of the radial dimension of the valve core 2 is larger than the radial dimension of the liquid inlet 13 .

[0061] Specifically, Figure 2 As shown, the radial dimension of the upper portion of the valve core 2 is greater than the radial dimension of the liquid inlet 13, and the radial dimension of the upper portion of the valve core 2 is greater than the dimension of the lower portion of the valve core 2, that is, the area of ​​the second contact surface 23 is greater than the area of ​​the second contact surface 23. The valve core 2 has an annular surface 24, which is located between the first contact surface 22 and the second contact surface 23, and the annular surface 24 is located in the oil inlet section 11.

[0062] That is to say, when the valve core 2 is in the first position, the oil in the liquid inlet 13 enters the oil leakage section 12 through the connecting hole 21. Since the oil leakage section 12 is connected with the oil in the liquid inlet 13, the pressures of each part of the oil are equal. Since the area of ​​the second contact surface 23 is larger than the area of ​​the second contact surface 23, the pressure of the second contact surface 23 is greater than the pressure of the first contact surface 22, and the reset member 3 also gives the valve core 2 a downward thrust, so that the valve core 2 is stabilized in the first position.

[0063] It can be understood that when the valve core 2 moves from the first position to the second position, the liquid inlet 13 is connected to the liquid outlet, and the oil can be discharged through the liquid inlet 13, the oil inlet section 11 and the liquid outlet 14. At this time, the oil inlet section 11 is full of oil, and the oil will act on the annular surface 24, so that the annular surface 24 has a certain pressure. When the valve core 2 moves from the second position to the first position, the oil inlet section 11 is connected to the liquid outlet 14, and the pressure of the oil in the oil inlet section 11 is equal to the pressure of the oil in the liquid outlet 14. At this time, the pressure on the annular surface 24 drops (the pressure drop on the annular surface 24 can be ignored). Then, when analyzing the force on the valve core 2 when it is in the first position, the force on the first contact surface 22 is less than the force on the second contact surface 23, so that the valve core 2 moves from the second position to the first position, and then the liquid inlet 13 is blocked.

[0064] In some embodiments, the valve core 2 has a sealing portion 25, which is arranged adjacent to the liquid inlet 13 so that when the valve core 2 moves between the first position and the second position, the liquid inlet 13 and the liquid outlet 14 are blocked or connected, and the radial dimension of the sealing portion 25 gradually decreases along the direction from the valve core 2 to the liquid inlet 13.

[0065] Specifically, Figure 2 As shown, the blocking portion 25 is located at the lower part of the valve core 2. When the valve core 2 is in the first position, the blocking portion 25 abuts against the liquid inlet 13 to achieve blocking of the liquid inlet 13. The radial dimension of the blocking portion 25 decreases from top to bottom, that is, when the valve core 2 is in the first position, part of the blocking portion 25 is placed in the liquid inlet 13, which is beneficial to the cooperation between the valve core 2 and the liquid inlet 13 through the blocking portion 25.

[0066] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A stop valve, characterized in that: include: A valve body, the valve body having a valve cavity, the valve cavity including an oil inlet section and an oil drain section, the valve body further comprising a liquid inlet, a liquid outlet and a pressure relief port, each of the liquid inlet and the liquid outlet being in communication with the oil inlet section, and the pressure relief port being in communication with the oil drain section; A valve core is movably disposed in the valve cavity between a first position and a second position, and at least a portion of the valve core is located between the oil inlet section and the oil drain section. When the valve core is located at the first position, the liquid inlet can be blocked so as to block the liquid inlet and the liquid outlet. When the valve core is located at the second position, the liquid inlet can be released so as to connect the liquid inlet and the liquid outlet. The valve core has a connecting hole, the connecting hole connects the liquid inlet and the oil drain section, the radial dimension of the connecting hole is smaller than the radial dimension of the liquid inlet, and the pressure relief port is used to connect the oil drain section and the oil drain tank; a reset member, the reset member being disposed in one of the oil inlet section and the oil drain section, and the reset member being used for driving the valve core to move from the second position to the first position; and A switch assembly, the switch assembly is used to open or close the pressure relief port so that the valve core moves between a first position and a second position, thereby causing the valve core to release or block the liquid inlet; The switch assembly includes a first switch component, the first switch component is a two-position three-way reversing valve controlled by liquid pressure, the first switch component has a first oil inlet and a first oil outlet, the first oil inlet is connected to the pressure relief port, the first oil outlet is used to connect to the oil drain tank, the first switch component includes a first detection part and a second detection part, when the pressure detected by the first detection part is greater than the pressure detected by the second detection part, the first oil inlet is connected to the first oil outlet, so that the oil enters the first switch component through the first oil inlet and is discharged from the first oil outlet to the oil drain tank; The first detection portion has a first detection surface, the second detection portion has a second detection surface, and the cross-sectional area of ​​the first detection surface is greater than the cross-sectional area of ​​the second detection surface; The switch assembly further includes a second switch component, which is a two-position three-way electromagnetic reversing valve, and has an oil drain port, a second oil inlet port, and a second oil outlet port. The second oil inlet port is connected to the liquid inlet port, and the second oil outlet port is connected to the first detection part, so that the oil discharged from the second oil outlet port acts on the first detection surface, and the second detection part is connected to the oil drain section, so that the oil in the oil drain section acts on the second detection surface. When the second switch is opened, the second oil inlet is connected to the second oil outlet, so that oil can flow into the second switch through the second oil inlet and be discharged from the second oil outlet to act on the first detection surface, so that the first detection part detects the pressure on the first detection surface, thereby making the pressure detected by the first detection part greater than the pressure detected by the second detection part. When the second switch is closed, the second oil outlet is connected to the oil drain port, so that the oil in the first detection part passes through the second oil outlet and is discharged from the oil drain port, thereby making the pressure on the first detection surface lower than the pressure on the second detection surface.

2. The stop valve according to claim 1, characterized in that: The second switch member further includes a first control switch, the first control switch is used to connect or block the second oil inlet and the second oil outlet, and the first control switch is used to connect or block the second oil outlet and the oil drain port. When the first control switch is turned on, the first control switch connects the second oil inlet and the second oil outlet, and blocks the second oil outlet and the oil drain, so that the oil in the oil inlet flows into the first detection part through the second switch element and acts on the first detection surface, so that the first detection part detects the pressure on the first detection surface. When the first control switch is closed, the first control switch blocks the second oil inlet and the second oil outlet, and the first control switch connects the second oil outlet and the oil drain port, so that the oil in the first detection part passes through the second oil outlet and is discharged from the oil drain port, thereby making the pressure on the first detection surface lower than the pressure on the second detection surface.

3. The stop valve according to claim 1, characterized in that: The reset member is arranged in the oil inlet section, and the reset member always has a tendency to drive the valve core to move from the second position to the first position.

4. The stop valve according to claim 1, characterized in that: The reset member is arranged in the oil leakage section, and the reset member always has a tendency to drive the valve core to move from the second position to the first position.

5. The stop valve according to claim 4, characterized in that: The valve core comprises a placement groove, the placement groove is arranged toward the oil leakage section, and a part of the reset member is placed in the placement groove.

6. The stop valve according to claim 5, characterized in that: The radial dimension of at least part of the valve core is larger than the radial dimension of the liquid inlet.

7. The stop valve according to claim 6, characterized in that: The valve core has a blocking portion, which is arranged adjacent to the liquid inlet so that when the valve core moves between the first position and the second position, the liquid inlet and the liquid outlet are blocked or connected, and the radial dimension of the blocking portion gradually decreases along the direction from the valve core to the liquid inlet.

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