Cutoff valve

Abstract

The invention discloses a block valve which comprises a guide valve, a valve body component and a piston component. The valve body component comprises a valve port part, a first communicating port and a second communicating port, the first communicating port communicates with the valve port part, and the second communicating port communicates with the first communicating port through the valve port part; the piston component is located in the valve body component and can move in the axial direction of the valve body component so as to close or open the valve port part. The piston component comprises a first end and a second end which are opposite, the first end can abut against the valve port part, the second end is far away from the valve port part, a relatively independent first cavity is formed between the second end of the piston component and the valve body component, the valve body component is provided with a first connector part communicated with the first cavity, and a control pipeline of the pilot valve is connected with the first connector part. The pilot valve is used for switching the pressure state in the first cavity to form driving force for driving the piston component to move. The stop valve is high in reliability, and the failure probability can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control, and particularly to a shut-off valve. Background Art

[0002] Due to the increasing requirements for the environmental protection characteristics of refrigerants in the refrigeration system, the application of environmentally friendly refrigerants (such as R32 refrigerant) has been gradually widespread. Such refrigerants have a relatively high flammability. If a leakage accident occurs, it will lead to safety accidents. Therefore, in practical applications, a shut-off valve that can quickly sense and cut off the refrigerant flow path is required to ensure the safety of the refrigeration system.

[0003] In the existing shut-off valve, two piston components are used to divide the inner cavity of the valve body into three chambers: left, middle, and right. The two piston components are connected to a slider through a connecting rod component. By changing the pressures in the left and right chambers, the differential pressure force is used to push the piston component and the connecting rod component to drive the slider to move to switch the on-off state of the shut-off valve. In practical applications, it is found that the pressure resistance strengths of the connecting rod component and the piston component are insufficient, and the connection part between the connecting rod component and the piston component is prone to fracture, resulting in product failure.

[0004] In view of this, how to provide a shut-off valve with high reliability is a technical problem that those skilled in the art need to solve currently. Summary of the Invention

[0005] The purpose of the present application is to provide a shut-off valve. Through structural optimization, the reliability of this shut-off valve is relatively high, and the failure probability can be reduced.

[0006] To solve the above technical problem, the present application provides a shut-off valve, including a pilot valve, a valve body component, and a piston component;

[0007] The valve body component includes a valve port part, a first communication port, and a second communication port. The first communication port is communicated with the valve port part, and the second communication port is communicated with the first communication port through the valve port part;

[0008] The piston component is located inside the valve body component and can move axially along the valve body component to close or open the valve port part;

[0009] The piston component includes an opposite first end and a second end. The first end can abut against the valve port part, and the second end is away from the valve port part. A relatively independent first chamber is formed between the second end of the piston component and the valve body component. The valve body component has a first interface part communicating with the first chamber, and the control pipeline of the pilot valve is connected to the first interface part. The pilot valve is used to switch the pressure state in the first chamber to form a driving force for driving the piston component to move.

[0010] After adopting the above solution, the pressure state at the second end of the pilot valve switching piston component away from the valve port makes the pressures at the first end and the second end of the piston component different, forming a pressure difference. Under the action of this pressure difference, the piston component is pushed to move closer to or away from the valve port, and the on-off valve is realized by the piston component abutting against or separating from the valve port. In this solution, the driving force formed by the pressure difference directly acts on the piston component. The structure of the piston component is simple and the action reliability is high. Compared with the structure in the background art where the connecting rod, the piston and the slider are connected, the pressure-bearing capacity is strong, it is not easy to be damaged, and the probability of product failure can be reduced.

[0011] In an implementable solution, the valve body component includes a valve housing and a valve seat. The valve seat includes the valve port, and the outer peripheral wall of the valve seat is fixedly welded to the inner peripheral wall of the valve housing.

[0012] In an implementable solution, the valve seat further includes a tapered portion and a connecting portion. The tapered portion connects the valve port and the connecting portion. The diameter of the tapered portion gradually increases downward along the axial direction of the valve housing, and the outer peripheral wall of the connecting portion is fixedly welded to the inner peripheral wall of the valve housing.

[0013] In an implementable solution, the valve housing includes a housing body and two end caps. The housing body has two opposite open ends, and the two end caps respectively seal the two open ends. The first communication port and the second communication port are provided on the housing body. The first interface portion is provided on the housing body or the end cap.

[0014] In an implementable solution, the valve housing includes a housing body and one end cap. The housing body has two opposite openings. The end cap seals one of the two openings, and the other of the two openings forms the first communication port. The second communication port is provided on the housing body. The first interface portion is provided on the housing body or the end cap.

[0015] In an implementable solution, both the valve housing and the valve seat are made of stainless steel material; and / or, the valve housing and the valve seat are pre-fixed by spot welding.

[0016] In an implementable solution, the shut-off valve further includes an elastic member;

[0017] The elastic member is located in the first chamber. One end of the elastic member abuts against the second end of the piston component, and the other end of the elastic member abuts against the valve body component. Alternatively, the elastic member is provided between the piston component and the valve port.

[0018] In one feasible solution, the valve housing includes a housing body and a first end cover. The housing body is fixedly connected to the first end cover. The second end includes an installation groove. The first end cover includes a recess, an abutting portion, and a mating portion. A part of the elastic member is located in the installation groove, and another part of the elastic member is located in the recess. The abutting portion connects the recess and the mating portion. The abutting portion can limit the upward stroke of the piston component. The outer peripheral wall of the mating portion is fixedly welded to the inner peripheral wall of the valve housing.

[0019] In one feasible solution, the piston component includes a piston body and a seal. The piston body is slidably and sealingly fitted with the valve body component through the seal. The piston body is made of plastic and / or rubber.

[0020] In one feasible solution, the piston component includes a piston body and a seal. The piston body includes two large-diameter portions and a small-diameter portion located between the two large-diameter portions. The large-diameter portion has an annular groove, and the seal is located in the annular groove. A second chamber is formed between the two seals and between the small-diameter portion and the valve body component. The second chamber is located between the first chamber and the valve port portion. The valve body component also has a second interface portion communicating with the second chamber. The second interface portion is connected to the control pipeline of the pilot valve.

[0021] In one feasible solution, the shut-off valve further includes two connecting pipe assemblies. The two connecting pipe assemblies are respectively fixedly connected to the first communication port and the second communication port. The connecting pipe assembly includes a main connecting pipe made of stainless steel and a copper connecting pipe and / or a copper collar fixedly connected to the connecting pipe. The copper collar can be fixedly connected to an external connecting pipeline. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the shut-off valve provided by this application;

[0023] Figure 2 It is Figure 1 A partial cross-sectional view of the shown shut-off valve in the closed valve state;

[0024] Figure 3 It is Figure 1 A partial cross-sectional view of the shown shut-off valve in the open valve state;

[0025] Figure 4 It is Figure 2 A partial cross-sectional view of the piston component of the shut-off valve in

[0026] Figure 5 It is Figure 1 A schematic structural diagram of the valve housing, the connecting pipe assembly, and the support of the shut-off valve in

[0027] Figure 6 is Figure 5 a partial sectional view of the structure shown;

[0028] Figure 7 is a schematic structural diagram of another embodiment of the stop valve provided by the present application.

[0029] Explanation of reference numerals:

[0030] valve body component 10, valve port part 101, first communication port 102, second communication port 103, first chamber 104, second chamber 105, first interface part 106, second interface part 107;

[0031] valve housing 11, housing body 111, end cover 112, first end cover 112a, recess 1121a, abutting part 1122a, mating part 1123a, second end cover 112b, valve seat 12, conical part 121, connecting part 122;

[0032] piston component 20, first end 201, second end 202, piston body 21, large-diameter part 211, annular groove 2111, small-diameter part 212, mounting groove 213, seal 22;

[0033] elastic member 30;

[0034] connection pipe assembly 40, main connection pipe 41, copper connection pipe 42, copper sleeve ring 43;

[0035] copper-made adapter pipe 50;

[0036] pilot valve 60, high-pressure pipe 61, low-pressure pipe 62, first capillary tube 631, second capillary tube 632;

[0037] bracket 70. Specific embodiments

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The stop valve provided by the embodiment of the present application can be applied to a refrigeration system, can cut off the pipeline according to the system requirements, can replace the existing stop valve or reversible valve, and can improve the working reliability and reduce the product failure probability through structural optimization.

[0040] Please refer to Figures 1 to 3 , Figure 1 which is a schematic structural diagram of an embodiment of the stop valve provided by the present application; Figure 2 is Figure 1 a partial sectional view of the stop valve shown in the closed valve state; Figure 3 is Figure 1 a partial sectional view of the stop valve shown in the open valve state.

[0041] In this embodiment, the shut-off valve includes a pilot valve 60, a valve body component 10, and a piston component 20.

[0042] The valve body component 10 includes a valve port portion 101, a first communication port 102, and a second communication port 103. The first communication port 102 communicates with the valve port portion 101, and the second communication port 103 communicates with the first communication port 102 through the valve port portion 101.

[0043] The piston component 20 is located within the valve body component 10 and is capable of moving axially along the valve body component 10 to close or open the valve port portion 101. By closing or opening the valve port portion 101, the piston component 20 can cut off or conduct the passage between the first communication port 102 and the second communication port 103. It can be understood that when the piston component 20 closes the valve port portion 101, the passage between the second communication port 103 and the first communication port 102 is cut off, and the fluid medium cannot flow between the first communication port 102 and the second communication port 103. When the piston component 20 opens the valve port portion 101, the passage between the second communication port 103 and the first communication port 102 is conducted, and the fluid medium can flow between the first communication port 102 and the second communication port 103.

[0044] The piston component 20 includes opposite first end 201 and second end 202. The first end 201 is close to the valve port portion 101 and can abut against the valve port portion 101. The second end 202 is away from the valve port portion 101. A relatively independent first chamber 104 is formed between the second end 202 of the piston component 20 and the valve body component 10. The valve body component 10 has a first interface portion 106 communicating with the first chamber 104. The control pipeline of the pilot valve 60 is connected to the first interface portion 106. The pilot valve 60 is used to switch the pressure state in the first chamber 104 to form a driving force for driving the piston component 20 to move. The pressure state in the first chamber 104 includes opposite high-pressure state and low-pressure state.

[0045] Taking Figure 2 and Figure 3 the shown orientation, the axial direction of the valve body component 10 is the up-down direction in the figure. The first end 201 of the piston component 20 is the lower end of the piston component 20, and the second end 202 is the upper end of the piston component 20. When the piston component 20 closes the valve port portion 101, its first end 201 is in sealing cooperation with the valve port portion 101.

[0046] After adopting the above solution, the pilot valve 60 switches the pressure state of the piston component 20 away from the second end 202 of the valve port part 101, so that the pressures received by the first end 201 and the second end 202 of the piston component 20 are different, forming a pressure difference. Under the action of this pressure difference, the piston component 20 is pushed to move closer to or away from the valve port part 101, thereby realizing the opening and closing of the valve. In this solution, the driving force formed by the pressure difference directly acts on the piston component 20. The structure of the piston component 20 is simple and the action reliability is high. Compared with the structure in the background art where the connecting rod, the piston and the slider are connected, the pressure bearing capacity is strong, it is not easy to be damaged, and the probability of product failure can be reduced.

[0047] In specific implementation, the moving direction of the piston component 20 is consistent with the extending direction of the center line of the valve port part 101. In this way, when closing the valve, the piston component 20 has better sealing performance for the valve port part 101, and the cut-off function with low internal leakage can be realized.

[0048] The pilot valve 60 includes a high-pressure pipe 61 and a low-pressure pipe 62. The high-pressure pipe 61 is connected to the system high-pressure pipeline, and the low-pressure pipe 62 is connected to the system low-pressure pipeline. The control pipeline of the pilot valve 60 includes several capillary tubes. The pilot valve 60 can switch whether the capillary tube is communicated with the high-pressure pipe 61 or the low-pressure pipe 62 under the drive of its driving component. Specifically in this solution, the first capillary tube 631 of the pilot valve 60 can be communicated with the first chamber 104 through the aforementioned first interface part 106. In this way, by switching the first capillary tube 631 of the pilot valve 60 to be communicated with the high-pressure pipe 61 or the low-pressure pipe 62, the pressure state of the first chamber 104 is changed, so as to change the direction of the differential pressure force acting on the piston component 20.

[0049] For the specific structure of the pilot valve 60, reference can be made to the pilot valve structure of the existing reversing valve, which is not the core point of the invention of this application and will not be introduced in detail here.

[0050] Specifically, when the first capillary tube 631 is communicated with the high-pressure pipe 61, the first chamber 104 is a high-pressure chamber, and the piston component 20 is subjected to a downward differential pressure force and moves in the direction close to the valve port part 101 to close the valve. When the first capillary tube 631 is communicated with the low-pressure pipe 62, the first chamber 104 is a low-pressure chamber, and the piston component 20 is subjected to an upward differential pressure force and moves in the direction away from the valve port part 101 to open the valve. Here, the up and down still take Figure 2 and Figure 3 the shown orientation as the reference.

[0051] In this embodiment, the cut-off valve is further provided with an elastic member 30, which can achieve the effect of closing the valve without pressure difference or opening the valve without pressure difference according to the different installation positions of the elastic member 30.

[0052] In a feasible solution, as Figure 2 and Figure 3As shown, the elastic member 30 is located in the first chamber 104. One end of the elastic member 30 abuts against the second end 202 of the piston member 20, and the other end of the elastic member 30 abuts against the valve body member 10. Thus, the elastic member 30 exerts an elastic force on the piston member 20 towards the valve port portion 101. In this way, when the system is shut down, under the action of the elastic force of the elastic member 30, the piston member 20 can maintain the valve closing state of closing the valve port portion 101. It can be understood that at this time, the cut-off valve is a normally closed valve; after the system is started, when the first capillary 631 of the pilot valve 60 is communicated with the low-pressure pipe 62, the first chamber 104 is in a low-pressure state, and the fluid pressure flowing in from the first communication port 102 is greater than the low pressure in the first chamber 104. Under the action of the pressure difference, the piston member 20 can move upward to overcome the elastic force of the elastic member 30 to open the valve port portion 101 and conduct the first communication port 102 and the second communication port 103; when the pilot valve 60 performs a commutation action to make the first capillary 631 communicate with the high-pressure pipe 61, the first chamber 104 is in a high-pressure state. Under the action of the pressure difference force and the elastic force of the elastic member 30, the piston member 20 moves towards the direction where the valve port portion 101 is located to close the valve and cut off the first communication port 102 and the second communication port 103.

[0053] Please also refer to Figure 4 , Figure 4 for Figure 2 a partial cross-sectional view of the piston member of the cut-off valve in

[0054] In a specific implementation, an installation groove 213 can be provided at the second end 202 of the piston member 20 to limit the elastic member 30. At the same time, a groove or a convex portion can also be provided at the corresponding position of the valve body member 10 to limit the position of the elastic member 30. In other implementation manners, a convex portion protruding towards the first chamber 104 can also be provided at the second end 202 of the piston member 20, and the elastic member 30 is sleeved on the convex portion for positioning.

[0055] In another feasible solution, the elastic member 30 can be arranged between the piston member 20 and the valve port portion 101, so that the elastic member 30 exerts an elastic force on the piston member 20 away from the valve port portion 101. In this way, when the system is shut down, under the action of the elastic force of the elastic member 30, the piston member 20 moves away from the valve port portion 101 to open the valve. It can be understood that at this time, the cut-off valve is a normally open valve; after the system is started, under the control of the pilot valve 60 of the pressure state of the first chamber 104, combined with the elastic force of the elastic member 30, the moving direction of the piston member 20 can also be changed to realize the opening or closing operation of the valve.

[0056] Exemplarily, the elastic member 30 can be a spring or other components with elastic deformation.

[0057] In this embodiment, the piston component 20 includes a piston body 21 and a seal 22. The piston body 21 is slidably and sealingly engaged with the valve body component 10 through the seal 22. Among them, the piston body 21 can be made of plastic or rubber. It can be understood that the seal 22 is annular and is located between the outer peripheral wall of the piston body 21 and the inner peripheral wall of the valve body component 10.

[0058] Generally, the valve body component 10 is made of metal. After the piston body 21 is made of plastic and / or rubber, the seal between the piston body 21 and the valve port 101 is a soft seal, which can improve the sealing effect when closing the valve and reduce the internal leakage of the shut-off valve.

[0059] Exemplarily, the plastic can be PTFE (Polytetrafluoroethylene) or other high molecular materials.

[0060] In a specific implementation, the seal 22 can adopt a Gleitring. The Gleitring is composed of a rubber O-ring and a polytetrafluoroethylene ring. It has low friction and can ensure the smooth movement of the piston component 20 while achieving a high sealing effect, and can further improve the reliability of the operation of the shut-off valve. In other implementation manners, the seal 22 can also adopt other sealing structures.

[0061] In this embodiment, the piston body 21 of the piston component 20 includes two large-diameter portions 211 and a small-diameter portion 212 located between the two large-diameter portions 211. The large-diameter portions 211 of the piston body 21 are slidably engaged with the valve body component 10. On this basis, the seal 22 is arranged between the large-diameter portion 211 and the valve body component 10, and seals 22 are provided between both of the two large-diameter portions 211 and the valve body component 10 to ensure the sealing effect.

[0062] In a specific implementation, the large-diameter portion 211 has an annular groove 2111 for installing the seal 22.

[0063] The above structural setting of the piston body 21 enables a second chamber 105 to be formed between the two seals 22 and between the small-diameter portion 212 and the valve body component 10. The second chamber 105 and the first chamber 104 are both relatively independent chambers; the valve body component 10 is also provided with a second interface portion 107 communicating with the second chamber 105, and the second capillary 632 of the control pipeline of the pilot valve 60 is communicated with the second chamber 105 through the second interface portion 107. When the pilot valve 60 is in the first working position, the first capillary 631 is communicated with the high-pressure pipe 61, and the second capillary 632 is communicated with the low-pressure pipe 62. When the pilot valve 60 is in the second working position, the first capillary 631 is communicated with the low-pressure pipe 62, and the second capillary 632 is communicated with the high-pressure pipe 61. That is to say, when the pilot valve 60 changes the pressure state of the first chamber 104 by commutation, it also synchronously changes the pressure state of the second chamber 105, and the pressure states of the first chamber 104 and the second chamber 105 are opposite.

[0064] Generally speaking, the control pipeline of the pilot valve 60 includes at least two capillaries, and the structural setting of the piston body 21 can facilitate the connection between the capillaries of the pilot valve 60 and the valve body component 10. However, it should be pointed out that although the second chamber 105 is connected to the second capillary 632, in fact, the pilot valve 60 switches and changes the pressure state of the second chamber 105 and does not substantially affect the movement of the piston component 20. The pressure of the second chamber 105 acts on both the large diameter portion 211 located above and the large diameter portion 211 located below, so the pressure of the second chamber 105 on the piston component 20 offsets each other, and the movement of the piston component 20 still depends on the pressure state of the first chamber 104. Therefore, in other implementations, the cut-off valve may not be provided with the second chamber 105.

[0065] Please refer to Figure 5 and Figure 6 , Figure 5 for Figure 1 A schematic diagram of the structure of the valve housing, pipe assembly and support of the middle cut-off valve after assembly; Figure 6 for Figure 5 A partial cross-sectional view of the structure shown.

[0066] In this embodiment, the valve body component 10 includes a valve housing 11 and a valve seat 12. The valve housing 11 has a relatively closed inner cavity, and the piston component 20 is located in the inner cavity of the valve housing 11. The valve seat 12 is provided with the aforementioned valve port portion 101, and the aforementioned first communication port 102, second communication port 103, first interface portion 106 and second interface portion 107 are all provided on the valve housing 11. The valve seat 12 is located in the inner cavity of the valve housing 11, and the outer peripheral wall of the valve seat 12 is welded and fixed to the inner peripheral wall of the valve housing 11. The valve seat 12 divides the inner cavity of the valve housing 11 into two cavities, so that the valve seat 12 can be used to seal the inner cavity of the valve housing 11. Figure 2 , Figure 3 and Figure 6 In the orientation shown, the two chambers are the upper chamber and the lower chamber, wherein the piston component 20 is located in the upper chamber, the first connecting port 102 is connected to the lower chamber, and the second connecting port 103 is connected to the upper chamber, and the valve seat 12 and the valve housing 11 are fixed by welding, which can ensure the sealing between the outer peripheral wall of the valve seat 12 and the inner peripheral wall of the valve housing 11, so that the second connecting port 103 can only be connected to the first connecting port 102 through the valve mouth portion 101.

[0067] In a specific implementation, the valve seat 12 includes a cone 121 and a connecting portion 122, the cone 121 connects the valve port 101 and the connecting portion 122, the diameter of the cone 121 is gradually increased downward along the axial direction of the valve housing 11, and the outer peripheral wall of the connecting portion 122 is welded and fixed to the inner peripheral wall of the valve housing 11. This structural design can determine the size of the valve port 101 as needed, thereby adjusting the maximum flow rate of the shut-off valve.

[0068] In a specific implementation, both the valve housing 11 and the valve seat 12 are made of stainless steel, which is convenient for manufacturing and has a low material cost. Generally speaking, it can reduce the cost of the stop valve and meet the development trend of lead-free.

[0069] Exemplarily, the valve seat 12 and the valve housing 11 can be pre-fixed by spot welding and then welded with solder such as bronze welding wire to ensure the sealing performance and avoid internal leakage.

[0070] In a specific implementation, the valve housing 11 includes a housing body 111 and two end covers. Here, for the convenience of distinction, the two end covers are respectively called the first end cover 112a and the second end cover 112b. The housing body 111 is in a tubular structure with two open ends. The first end cover 112a and the second end cover 112b respectively seal the two open ends of the housing body 111. Figure 2 and Figure 3 In the illustrated example, the first end cover 112a seals the upper open end of the housing body 111, and the second end cover 112b seals the lower open end of the housing body 111. In the illustrated example, since there is an elastic member 30 between the first end cover 112a and the second end 202 of the piston member 20, a concave portion 1121a is provided in the middle of the first end cover 112a to limit the elastic member 30. The structure of the second end cover 112b is different from that of the first end cover 112a. Of course, as described above, in other implementation manners, the structure for limiting the elastic member 30 on the first end cover 112a can also be in the form of a convex portion or the like.

[0071] Specifically, the first end cover 112a includes the aforementioned concave portion 1121a, an abutting portion 1122a, and a matching portion 1123a. Figure 2 and Figure 3 From the illustrated perspective, the upper end portion of the elastic member 30 is located in the concave portion 1121a, and the lower end portion of the elastic member 30 is located in the installation groove 213 of the piston member 20, which can limit the elastic member 30. The abutting portion 1122a connects the concave portion 1121a and the matching portion 1123a. The abutting portion 1122a can limit the upward movement stroke of the piston member 20. When the piston member 20 moves upward away from the valve port portion 101 and abuts against the abutting portion 1122a, it is limited and cannot move upward any further. The outer peripheral wall of the matching portion 1123a is welded and fixed to the inner peripheral wall of the valve housing 11.

[0072] On the basis that both open ends of the housing body 111 are sealed by end covers, a first communication port 102 is formed on the peripheral wall of the housing body 111, and a second communication port 103 is also formed on the peripheral wall of the housing body 111. The center lines of the first communication port 102 and the second communication port 103 are arranged in parallel. In the axial direction of the housing body 111, the first communication port 102 is located below the second communication port 103.

[0073] On the basis that an elastic member 30 is provided between the first end cover 112a and the piston member 20, the first interface portion 106 may be formed on the peripheral wall of the housing body 111. In other implementation manners, without interference, the first interface portion 106 may also be formed on the first end cover 112a (refer to Figure 7 as shown).

[0074] In this embodiment, the shut-off valve further includes two connecting pipe assemblies 40, and the two connecting pipe assemblies 40 are respectively fixedly connected to the first communication port 102 and the second communication port 103 to facilitate connecting the shut-off valve to the relevant pipelines of the system. The structural compositions of the two connecting pipe assemblies 40 may be the same.

[0075] The connecting pipe assembly 40 includes a main connecting pipe 41 made of stainless steel, and the main connecting pipe 41 is fixed to the first communication port 102 or the second communication port 103, and welding can be adopted, which is simple and reliable.

[0076] The connecting pipe assembly 40 may further include a copper connecting pipe 42, and the copper connecting pipe 42 is fixed to one end of the main connecting pipe 41 away from the first communication port 102 or the second communication port 103 to facilitate welding and fixing with the copper pipelines in the system.

[0077] In some examples, the connecting pipe assembly 40 may further include a copper collar 43, and the copper collar 43 is fixedly sleeved on the main connecting pipe 41 to facilitate welding and fixing with the relevant copper structures in the system. That is to say, the copper collar 43 can be fixedly connected to the external connecting pipeline.

[0078] In practical applications, the first capillary tube 631 and the second capillary tube 632 of the pilot valve 60 also mostly adopt copper tubes. For the convenience of connection, copper adapters 50 are fixedly connected to both the first interface portion 106 and the second interface portion 107 of the valve body member 10.

[0079] In a specific implementation, a bracket 70 is fixed on the outer peripheral wall of the housing body 111 of the valve body member 10 to facilitate the installation of the pilot valve 60.

[0080] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of another embodiment of the shut-off valve provided by this application.

[0081] The structural composition and basic principle of the shut-off valve provided in this embodiment are similar to those of the shut-off valve Figures 1 to 6 shown above. The same functional components or structures are denoted by the same reference numerals in the figure. The following mainly describes the differences, and other unmentioned parts can be understood by referring to the above description of Figures 1 to 6 .

[0082] In this embodiment, the valve body component of the shut-off valve includes a valve housing 11 and a valve seat 12. The valve housing 11 includes a shell body 111 and an end cover 112. The shell body 111 has two opposite openings. Specifically, a tubular structure with openings at both ends can also be adopted. The end cover 112 is used to block one opening of the shell body 111. The other opening of the shell body 111 forms a first connecting port 102, which is used to be fixedly connected to a pipe assembly 40 to facilitate connection with related pipelines in the system. The valve seat 12 has a valve port portion 101. The second connecting port 103 of the valve body component is provided on the peripheral wall of the shell body 111. The second connecting port 103 is fixedly connected to another pipe assembly 40 to facilitate connection with related pipelines in the system. In this way, the center line of the first connecting port 102 is parallel to the axial direction of the shell body 111, and the center line of the second connecting port 103 is perpendicular to the center line of the first connecting port 102.

[0083] The structure of the connecting pipe assembly 40 is similar to that of the above-mentioned Figures 1 to 6 The embodiments shown are consistent and can be understood by referring to the above description, so they will not be described in detail here.

[0084] The piston component 20 is located in the shell body 111 and is in sliding and sealing cooperation with the shell body 111 . The piston component 20 can move axially between the end cover 112 and the valve seat 12 along the shell body 111 .

[0085] A first chamber 104 is formed in the shell body 111 between the end cover 112 and the piston component 20. The first chamber 104 is connected to the first capillary 631 of the pilot valve 60. The pilot valve 60 switches and changes the pressure state in the first chamber 104 to form a pressure difference to drive the piston component 20 to move.

[0086] In this solution, the cut-off valve is not provided with an elastic member 30, and an interface portion communicating with the first chamber 104 is provided on the end cover 112. For convenient connection, a copper transfer tube 50 is fixedly connected to the interface portion to facilitate welding and fixing with the copper first capillary 631. In other implementation solutions, the interface portion communicating with the first chamber 104 may also be provided on the peripheral wall of the shell body 111.

[0087] In other implementations, an elastic member 30 may be provided between the end cover 112 and the piston member 20, or an elastic member 30 may be provided between the piston member 20 and the valve seat 12, so as to form a normally closed valve or a normally open valve as required.

[0088] In this solution, the piston component 20 is arranged with equal diameter as a whole, including a piston body 21 and a sealing member 22. The piston body 21 is slidably sealed with the shell body 111 through the sealing member 22. In this way, the cut-off valve does not have the aforementioned Figures 1 to 6 The second chamber 105 of the illustrated embodiment.

[0089] In a specific implementation, an annular groove for installing a seal 22 is formed on the outer peripheral wall of the piston body 21.

[0090] In a specific implementation, to ensure the sealing effect, two seals 22 are arranged at intervals in the axial direction of the piston body 21.

[0091] In this solution, the materials and the fixing methods of the housing body 111 and the valve seat 12 can be the same as those in the Figures 1 to 6 illustrated embodiment. In a specific implementation, the valve seat 12 can adopt a tubular structure, and the housing body 111, the valve seat 12, and the connecting pipe assembly 40 connected to the first communication port 102 can be sleeved and fixed together in sequence, that is, the housing body 111 is fixedly sleeved outside the valve seat 12, and the valve seat 12 is fixedly sleeved outside the connecting pipe assembly 40.

[0092] It can be understood that Figures 1 to 6 the piston component 20 in the illustrated implementation scheme can be replaced with the Figure 7 illustrated piston component 20, Figure 7 and the piston component 20 in the illustrated implementation scheme can also be replaced with the Figures 1 to 6 illustrated piston component 20.

[0093] In this article, specific examples are used to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A shut-off valve, characterized in that, It includes a pilot valve, a valve body component, and a piston component; The valve body component includes a valve port portion, a first communication port, and a second communication port. The first communication port communicates with the valve port portion, and the second communication port communicates with the first communication port through the valve port portion; The piston component is located within the valve body component and is capable of moving axially along the valve body component to close or open the valve port portion; The piston component includes an opposite first end and a second end. The first end is capable of abutting against the valve port portion, and the second end is away from the valve port portion. A relatively independent first chamber is formed between the second end of the piston component and the valve body component. The valve body component has a first interface portion communicating with the first chamber. The control pipeline of the pilot valve is connected to the first interface portion, and the pilot valve is used to switch the pressure state within the first chamber to form a driving force for driving the piston component to move.

2. The shut-off valve according to claim 1, characterized in that, The valve body component includes a valve housing and a valve seat. The valve seat includes the valve port portion, and the outer peripheral wall of the valve seat is welded and fixed to the inner peripheral wall of the valve housing.

3. The shut-off valve according to claim 2, characterized in that, The valve seat further includes a tapered portion and a connecting portion. The tapered portion connects the valve port portion and the connecting portion. The diameter of the tapered portion gradually increases downward along the axis of the valve housing, and the outer peripheral wall of the connecting portion is welded and fixed to the inner peripheral wall of the valve housing.

4. The shut-off valve according to claim 2, characterized in that, The valve housing includes a housing body and two end covers. The housing body has two opposite open ends, and the two end covers respectively seal the two open ends; the first communication port and the second communication port are provided on the housing body; the first interface portion is provided on the housing body or the end cover.

5. The shut-off valve according to claim 2, characterized in that, The valve housing includes a housing body and one end cover. The housing body has two opposite openings, and the end cover seals one of the two openings. The other of the two openings forms the first communication port, and the second communication port is provided on the housing body; the first interface portion is provided on the housing body or the end cover.

6. The shut-off valve according to any one of claims 2-5, characterized in that, Both the valve housing and the valve seat are made of stainless steel material; and / or, the valve housing and the valve seat are pre-fixed by spot welding.

7. The shut-off valve according to any one of claims 1-5, characterized in that, The shut-off valve further includes an elastic member; The elastic member is located within the first chamber. One end of the elastic member abuts against the second end of the piston component, and the other end of the elastic member abuts against the valve body component. Alternatively, the elastic member is provided between the piston component and the valve port portion.

8. The shut-off valve according to claim 7, characterized in that, The valve housing includes a housing body and a first end cover. The housing body is fixedly connected to the first end cover. The second end includes a mounting groove. The first end cover includes a concave portion, an abutting portion, and a mating portion. A part of the elastic member is located within the mounting groove, and another part of the elastic member is located within the concave portion. The abutting portion connects the concave portion and the mating portion, and the abutting portion is capable of restricting the upward stroke of the piston component. The outer peripheral wall of the mating portion is welded and fixed to the inner peripheral wall of the valve housing.

9. The shut-off valve according to any one of claims 1-5, characterized in that, The piston component includes a piston body and a seal. The piston body is in sliding seal fit with the valve body component through the seal, and the piston body is made of plastic and / or rubber.

10. The shut-off valve according to any one of claims 1-5, characterized in that, The piston component includes a piston body and a sealing member, the piston body includes two large diameter portions and a small diameter portion located between the two large diameter portions, the large diameter portion has an annular groove, and the sealing member is located in the annular groove; a second chamber is formed between the two sealing members and between the small diameter portion and the valve body component, the second chamber is located between the first chamber and the valve mouth portion, the valve body component also has a second interface portion connected to the second chamber, and the second interface portion is connected to the control pipeline of the pilot valve.

11. The shut-off valve according to any one of claims 1-5, characterized in that, The shut-off valve also includes two connecting pipe assemblies, which are fixedly connected to the first connecting port and the second connecting port respectively; the connecting pipe assembly includes a main connecting pipe made of stainless steel and a copper connecting pipe and / or a copper collar fixedly connected to the connecting pipe, and the copper collar can be fixedly connected to an external connecting pipeline.

Images