shut-off valve

Abstract

The disclosure provides a kind of closing valve, including valve seat assembly, valve core assembly and drive assembly;Valve seat assembly has valve cavity, and two sides of valve seat assembly in the first direction are respectively provided with valve port;Valve core assembly is arranged in valve cavity;Drive assembly can drive valve core assembly to move up and down, when valve core assembly moves to the position between two valve ports, it is disconnected between the communication of two valve ports;Valve seat assembly is also provided with base, and base is below valve port;Base includes bottom plate and limiting protrusion, bottom plate is connected to valve seat assembly, limiting protrusion is formed by the upward protruding of bottom plate, and limiting protrusion is below valve core assembly, to realize the lower limit of valve core assembly.Through the above structural design, the disclosure utilizes base to shorten the distance between the lower end of valve seat assembly and valve core assembly, reduces the length size of valve core assembly by the lower limit of valve core assembly, and shortens the moving stroke of valve core assembly, which is beneficial to meet the higher design requirements of closing valve about light weight and miniaturization.

Description

Technical Field

[0001] This disclosure relates to the field of valves, and more particularly to a shut-off valve. Background Technology

[0002] In existing designs of shut-off valves, the valve core is moved up and down by a drive mechanism to switch between on and off states. Since there is a certain distance between the valve port and the lower end of the valve seat assembly, to avoid incomplete valve core closure, the valve core's sealing structure needs to have a larger length to compensate for this distance. This results in an increased valve core volume, which is detrimental to lightweight shut-off valve design. Furthermore, due to the larger length of the valve core, it must move upwards for a longer stroke to fully open the valve port, increasing space requirements and hindering miniaturization design of the shut-off valve. Summary of the Invention

[0003] A primary objective of this disclosure is to overcome at least one of the deficiencies of the prior art described above and to provide a shut-off valve.

[0004] To achieve the above objectives, the present disclosure adopts the following technical solution: According to one aspect of this disclosure, a shut-off valve is provided, comprising a valve seat assembly, a valve core assembly, and a drive assembly; the valve seat assembly has a valve cavity, and valve ports are respectively provided on both sides of the valve seat assembly in a first direction; the valve core assembly is disposed within the valve cavity; the drive assembly is capable of driving the valve core assembly to move up and down, such that when the valve core assembly moves downward to a position between the two valve ports, the communication between the two valve ports is disconnected; wherein, the valve seat assembly is further provided with a base, the base being located below the valve ports; the base includes a base plate and a limiting protrusion, the base plate being connected to the valve seat assembly, the limiting protrusion being formed by the base plate protruding upward, and the limiting protrusion being located below the valve core assembly to achieve a lower limit position of the valve core assembly.

[0005] According to one embodiment of this disclosure, the valve port has an inner orifice near the valve cavity; the upper end of the limiting protrusion is arranged at a height lower than the lower end of the inner orifice.

[0006] According to one embodiment of this disclosure, the cross-section of the sidewall of the limiting protrusion includes a straight segment and a concave arc segment; the upper end of the straight segment is connected to the upper wall of the limiting protrusion, the lower end is connected to the upper end of the arc segment, and the lower end of the arc segment is connected to the base plate.

[0007] According to one embodiment of this disclosure, a first transition section is provided between the sidewall and the upper endwall of the limiting protrusion.

[0008] According to one embodiment of this disclosure, the edge of the base plate is provided with a flange, the flange being bent away from the valve core assembly; the base plate is connected to the valve seat assembly via the flange.

[0009] According to one embodiment of this disclosure, a second transition section is provided between the base plate and the flange.

[0010] According to one embodiment of this disclosure, the limiting protrusion is formed by the base via an integral stamping process.

[0011] According to one embodiment of this disclosure, the valve core assembly includes a nut and a sealing structure connected to the lower end of the nut; the drive assembly is disposed above the valve core assembly and includes a drive member and a screw; the drive member is disposed on the valve seat assembly and is used to drive the screw to rotate; the screw extends into the valve cavity and is screwed into the nut.

[0012] According to one embodiment of this disclosure, the sealing structure is connected to the nut via a connector; the upper part of the connector is connected to the nut, and the lower part of the connector is provided with a through hole extending along the first direction; the sealing structure includes two sealing blocks and an elastic element; the sealing block includes a sealing portion and a sleeve portion, the two sealing portions are respectively located on both sides of the connector in the first direction and are respectively arranged corresponding to the two valve ports, the two sleeve portions are sleeved on each other and pass through the through hole; the elastic element connects the two sealing portions and is located inside the sleeve portion.

[0013] According to one embodiment of this disclosure, the valve seat assembly includes a valve tube and two valve seats disposed within the valve tube; the valve tube has two first openings; the two valve seats are respectively arranged corresponding to the two first openings and are respectively provided with second openings, the second openings being arranged in a one-to-one correspondence with the first openings, and the corresponding first openings and second openings together forming the valve port; wherein, the two sealing portions block the first openings and / or the second openings, so that the two sealing portions restrict the circumferential position of the connector and the nut relative to the valve seat assembly.

[0014] According to one embodiment of this disclosure, the valve tube has a third opening at its axial end away from the drive assembly; the base is sealed in the third opening; the edge of the base plate is provided with a flange, the flange is bent away from the valve core assembly, and the base plate is connected to the valve tube via the flange; the limiting protrusion extends to a position between the two valve seats.

[0015] According to one embodiment of this disclosure, each of the two valve ports is connected to a branch pipe, and the two branch pipes are respectively connected to the valve cavity; the branch pipes pass through the first opening and are disposed in the second opening.

[0016] According to one embodiment of this disclosure, a first bearing is provided between the screw and the valve seat assembly.

[0017] According to one embodiment of this disclosure, the driving member is connected to a driving rod and can drive the driving rod to rotate; the driving rod extends axially and is located on the side of the screw away from the base, and the driving rod maintains a constant relative position with the valve seat assembly along the axial direction; the driving rod and the screw are connected by a reduction gear assembly.

[0018] According to one embodiment of this disclosure, two second bearings are provided between the drive rod and the valve seat assembly, and the two second bearings are arranged axially spaced apart.

[0019] As can be seen from the above technical solution, the advantages and positive effects of the shut-off valve proposed in this disclosure are as follows: The shut-off valve disclosed herein includes a valve seat assembly, a valve core assembly, and a drive assembly. The valve seat assembly has a valve cavity, and valve ports are respectively provided on both sides of the valve seat assembly in a first direction. Each valve port is connected to a branch pipe, and each branch pipe communicates with the valve cavity. The valve core assembly is disposed within the valve cavity. The drive assembly can drive the valve core assembly to move up and down, causing the valve core assembly to move downwards to a position between the two branch pipes, thus disconnecting the communication between the two branch pipes. The valve seat assembly also includes a base located below the valve ports. The base includes a base plate and a limiting protrusion. The base plate is connected to the valve seat assembly, and the limiting protrusion is formed by the base plate protruding upwards and located below the valve core assembly to achieve a lower limit position for the valve core assembly. Through the above structural design, this disclosure utilizes the base to shorten the distance between the lower end of the valve seat assembly and the valve core assembly, reduces the length of the valve core assembly by limiting its lower position, and shortens the travel of the valve core assembly, which is beneficial for meeting the higher design requirements of the shut-off valve regarding lightweighting and miniaturization. Attached Figure Description

[0020] The various objectives, features, and advantages of this disclosure will become more apparent from the following detailed description of preferred embodiments of the disclosure taken in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein: Figure 1 This is a perspective view of a shut-off valve according to an exemplary embodiment; Figure 2 yes Figure 1 Top view; Figure 3 It is along Figure 2 A sectional view of line AA in the diagram; Figure 4 yes Figure 3 An enlarged view of part B in the image; Figure 5 and Figure 6 They are Figure 1 The base is shown in two different perspectives. Figure 7 and Figure 8 These are exploded 3D views of the sealing structure from two different perspectives; Figure 9 yes Figure 3 An enlarged view of part C in the image.

[0021] The annotations in the attached figures are explained as follows: Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can have various variations in different embodiments without departing from the scope of this disclosure, and the descriptions and drawings therein are illustrative in nature and not intended to limit this disclosure.

[0023] In the following description of various exemplary embodiments of this disclosure, reference is made to the accompanying drawings, which form part of this disclosure, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of this disclosure. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of this disclosure. Furthermore, while the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of this disclosure, these terms are used herein only for convenience, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this disclosure.

[0024] See Figure 1 The illustration shows a perspective view of the shut-off valve proposed in this disclosure. In this exemplary embodiment, the shut-off valve proposed in this disclosure is described using a deceleration solenoid valve as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of this disclosure to other types of valves, and these changes shall still be within the scope of the principles of the shut-off valve proposed in this disclosure.

[0025] like Figure 1As shown, in one embodiment of this disclosure, the shut-off valve includes a valve seat assembly, a valve core assembly, and a drive assembly. (See also...) Figures 2 to 9 , Figure 2 China representatively shows Figure 1 Top view; Figure 3 The middle section represents the direction along Figure 2 A sectional view of line AA in the diagram; Figure 4 China representatively shows Figure 3 An enlarged view of part B in the image; Figure 5 and Figure 6 The images show representative perspective views of the base 500 from two different viewpoints. Figure 7 and Figure 8 The exploded three-dimensional views of the sealing structure 220 from two different perspectives are shown in the figures respectively. Figure 9 China representatively shows Figure 3 An enlarged view of section C in the figure. The structure, connection method, and functional relationship of the main components of the shut-off valve proposed in this disclosure will be described in detail below with reference to the above figures.

[0026] like Figures 1 to 6 As shown, in one embodiment of this disclosure, the valve seat assembly has a valve cavity 101, and valve ports are respectively provided on both sides of the valve seat assembly in a first direction. The first direction can be referred to as direction D1 shown in the accompanying drawings. The valve core assembly is disposed within the valve cavity 101. When the valve core assembly moves to a position between the two valve ports, the two sides of the valve core assembly in the first direction (e.g., the opposite sides of the sealing portion 2211 described below) respectively close the two valve ports, thus achieving a shut-off between the two valve ports. The drive assembly can drive the valve core assembly to move up and down, causing the valve core assembly to move downwards to a position between the two valve ports, thus disconnecting the communication between the two valve ports. In addition, the valve seat assembly also has a base 500, which is located below the valve ports. The base 500 includes a base plate 510 and a limiting protrusion 520. The base plate 510 is connected to the valve seat assembly, and the limiting protrusion 520 is formed by the upward protrusion of the base plate 510. The limiting protrusion 520 is located below the valve core assembly to achieve a lower limit on the valve core assembly. Through the above structural design, this disclosure uses the base 500 to shorten the distance between the lower end of the valve seat assembly and the valve core assembly, reduces the length of the valve core assembly by limiting the lower position of the valve core assembly, and shortens the travel of the valve core assembly, which helps to meet the higher design requirements of the shut-off valve for lightweighting and miniaturization.

[0027] like Figure 4As shown, in one embodiment of this disclosure, the valve port has an inner orifice near the valve cavity 101. The upper end of the limiting protrusion 520 is arranged at a height lower than the lower end of the inner orifice. Through the above structural design, while utilizing the limiting protrusion 520 to achieve the lower limiting function of the valve core assembly, this disclosure can ensure a relatively sufficient downward movement range of the valve core assembly, avoiding leakage caused by the valve core assembly not being able to fully close the valve port due to the lower limit of the valve core assembly (the upper end of the limiting protrusion 520) being too high, thus ensuring the sealing performance when the valve core assembly disconnects the connection between the two valve ports. In some other embodiments of this disclosure, when the upper end of the limiting protrusion 520 is arranged at the same height as the lower end of the inner orifice, the valve core assembly can also close the valve port.

[0028] like Figure 4 As shown, in one embodiment of this disclosure, the cross-section of the sidewall of the limiting protrusion 520 may include a straight segment 521 and a concave arc-shaped segment 522. Specifically, the upper end of the straight segment 521 is connected to the upper end wall of the limiting protrusion 520, and the lower end of the straight segment 521 is connected to the upper end of the arc-shaped segment 522. The lower end of the arc-shaped segment 522 is connected to the base plate 510 of the base 500. Through the above structural design, this disclosure utilizes the design of the arc-shaped segment 522 to increase the structural strength of the limiting protrusion 520, reduce stress, and help extend the service life of the base 500. In addition, this disclosure utilizes the design of the straight segment 521 to allow the upper end wall of the limiting protrusion 520 to extend further toward the valve core assembly, while maintaining the shape and area of ​​the upper end wall unchanged. This avoids the situation where the upper end wall area is small due to the need to extend the upward protrusion length when only the arc-shaped segment 522 is used, ensuring sufficient contact between the limiting protrusion 520 and the valve core assembly when they are in contact and limited, thus improving the reliability and stability of the shut-off valve.

[0029] like Figure 4 and Figure 5 As shown, in one embodiment of this disclosure, a first transition section 523 may be provided between the side wall and the upper end wall of the limiting protrusion 520. The first transition section 523 may be, for example, but is not limited to, a rounded corner structure. Through the above structural design, this disclosure utilizes the first transition section 523 to achieve a smooth transition between the side wall and the upper end wall of the limiting protrusion 520, avoiding the problem of local stress concentration and helping to extend the service life of the base 500.

[0030] like Figures 4 to 6As shown, in one embodiment of this disclosure, the edge of the base plate 510 may be provided with a flange 524, which bends away from the valve core assembly. Accordingly, the base plate 510 can be connected to the valve seat assembly via the flange 524. In other words, the base 500 is connected to the valve seat assembly via its flange 524. For example, the flange 524 can be attached to the inner wall of the valve seat assembly (e.g., the inner wall of the valve pipe 110 described below) in the circumferential direction and fixedly connected together by welding or other processes. Through the above structural design, this disclosure utilizes the flange 524 instead of the periphery of the base plate 510 to fix the valve seat assembly, which is beneficial to increase the connection area between the base 500 and the valve seat assembly, improve the connection strength between the two, and improve the reliability and stability of the shut-off valve.

[0031] like Figure 4 and Figure 5 As shown, based on the structural design of the base 500 including the flange 524, in one embodiment of this disclosure, the base 500 may be provided with a second transition section 525 between the base plate 510 and the flange 524. This second transition section 525 may be, for example, but is not limited to, a rounded corner structure. Through the above structural design, this disclosure utilizes the second transition section 525 to achieve a smooth transition of the base 500 between the base plate 510 and the flange 524, avoiding local stress concentration problems and helping to extend the service life of the base 500.

[0032] In one embodiment of this disclosure, the limiting protrusion 520 can be formed by integral stamping of the base 500. Through this design, the manufacturing process of the base 500 is simplified, and the integral structure of the limiting protrusion 520 improves structural strength and extends service life. Furthermore, it helps reduce component weight, facilitating the lightweight design of the shut-off valve. In some embodiments of this disclosure, when the base 500 also includes a flange 524, the flange 524 can also be formed together with the limiting protrusion 520 in the aforementioned integral stamping process.

[0033] like Figure 3As shown, in one embodiment of this disclosure, the valve core assembly may include a nut 210 and a sealing structure 220 connected to the lower end of the nut 210. A drive assembly is disposed above the valve core assembly and may include a drive member 310 and a screw 320. The drive member 310 is disposed on the valve seat assembly and is used to drive the screw 320 to rotate. The screw 320 extends into the valve cavity 101 and is screwed into the nut 210. Accordingly, the drive member 310 drives the screw 320 to rotate. Since the screw 320 is screwed into the nut 210, and the nut 210 is circumferentially limited by the valve seat assembly (for example, by the following engagement path of "nut 210-connector 230-sealing block 221-valve seat 120"), the nut 210 will move up and down, thereby driving the valve core assembly to move up and down, realizing the switching control of opening or closing the two valve ports.

[0034] like Figure 4 , Figure 7 and Figure 8As shown, in one embodiment of this disclosure, the sealing structure 220 can be connected to the nut 210 via a connector 230. The upper part of the connector 230 is connected to the nut 210, and the lower part of the connector 230 is provided with a through hole 231 extending in a first direction. The sealing structure 220 includes two sealing blocks 221 and an elastic member 222. The sealing block 221 includes a sealing portion 2211 and a sleeve portion 2212. The two sealing portions 2211 are located on opposite sides of the connector 230 in the first direction, and are respectively arranged corresponding to two valve ports. The two sleeve portions 2212 are sleeved together and pass through the through hole 231. In other words, the inner diameter of the sleeve portion 2212 of one sealing block 221 is greater than or equal to the outer diameter of the sleeve portion 2212 of the other sealing block 221, and the sleeve portion 2212 with the larger inner diameter is sleeved on the outer periphery of the sleeve portion 2212 with the smaller outer diameter. Accordingly, the combined structure formed by the sleeve portions 2212 passes through the through hole 231 of the connector 230. Based on this, the elastic member 222 connects the two sealing portions 2211 and is located inside the sleeve portion 2212. Through the above structural design, this disclosure utilizes the connector 230 to achieve the structural connection between the nut 210 and the sealing structure 220. Since the combined structure formed by the two sleeve parts 2212 passing through the through hole 231 of the connector 230, and the two sealing parts 2211 are respectively located on both sides of the connector 230 in the first direction, the connector 230 is used to simultaneously limit the nut 210 and the sealing structure 220 in the circumferential direction. Furthermore, since the sealing structure 220 and the valve seat assembly are also in a circumferential limit fit (for example, through the valve seat 120 described below to achieve circumferential limit), the nut 210 and the valve seat assembly can be circumferentially limited, preventing the nut 210 from rotating with the screw 320 when it rotates, allowing the nut 310 to move axially to open or close the valve port, and eliminating the need for an additional limiting structure in the valve seat assembly. This helps to reduce the structural complexity of the shut-off valve, reduce the number of parts, and simplify the processing and assembly difficulty.

[0035] In one embodiment of this disclosure, based on the structural design of the sealing structure 220 connecting the nut 210 via the connector 230, the nut 210 and the connector 230 can be manufactured using an integral injection molding process, or the nut 210 and the connector 230 can also be manufactured using an integral injection molding process with the connector 230 as an insert. Through the above design, this disclosure can further enhance the bonding strength between the nut 210 and the connector 230, ensuring a stable circumferential limiting relationship between the nut 210 and the valve seat assembly.

[0036] Furthermore, when the sealing structure 220 and the connector 230 are manufactured using an integral injection molding process, a molding process hole can be provided on the upper part of the connector 230. Through the above structural design, this disclosure can further enhance the bonding strength between the nut 210 and the connector 230 when manufactured using an integral injection molding process.

[0037] like Figure 4 , Figure 7 and Figure 8 As shown, in one embodiment of this disclosure, the valve seat assembly may include a valve tube 110 and two valve seats 120 disposed within the valve tube 110. Specifically, the valve tube 110 is provided with two first openings 111. The two valve seats 120 are respectively arranged corresponding to the first openings 111, and each of the two valve seats 120 is provided with a second opening 121, which is arranged in a one-to-one correspondence with the first openings 111. The corresponding first openings 111 and second openings 121 together form the aforementioned valve port. Based on this, two sealing portions 2211 block the first openings 111 and / or the second openings 121, so that the two sealing portions 2211 restrict the circumferential position of the connector 230 and the nut 210 relative to the valve seat assembly. For example, under the action of the elastic element 222, the two sealing parts 221 tend to move in opposite directions along the first direction. When no medium flows through the valve ports on both sides, the two surfaces of the two sealing parts 221 that are opposite to each other can respectively contact the two surfaces of the two valve seats 120 that are opposite to each other. When the medium flows through the two valve ports, one side is the high-pressure side and the other side is the low-pressure side. Under the action of the medium pressure on the high-pressure side, it can at least ensure that the sealing part 221 on the low-pressure side closes the valve port on the low-pressure side (i.e., closes the first opening 111 and / or the second opening 121), thus realizing the disconnection between the two valve ports. Through the above structural design, this disclosure can guide the valve core assembly during its up-and-down displacement using the valve seat 120, while simultaneously limiting the relative circumferential displacement between the valve core assembly and the valve seat 120, i.e., with the valve pipe 110. This forms a mating path of "nut 210 - connector 230 - sealing block 221 - valve seat 120" to achieve circumferential positioning of the nut 210 and the valve seat assembly, allowing the nut 210 to move axially when the screw 320 rotates. Furthermore, the second opening 121 of the valve seat 120 can extend the length of the valve port, thereby extending the connection length between the branch pipe 400 and the valve seat assembly and improving the connection strength between the branch pipe 400 and the valve seat assembly.

[0038] like Figure 3 and Figure 4As shown, in one embodiment of this disclosure, the valve tube 110 may have a third opening at its axially distal end from the drive assembly. The base 500 seals this third opening. Taking the example of a base plate 510 having a flange 524 at its edge, the base plate 510 can be connected to the valve tube 110 via this flange 524. Furthermore, the limiting protrusion 520 extends to a position between the two valve seats 120.

[0039] like Figures 1 to 4 As shown, in one embodiment of this disclosure, two valve ports can be respectively connected to branch pipes 400, and the two branch pipes 400 are respectively connected to valve chambers 101. Specifically, the branch pipe 400 passes through the first opening 111 of the valve pipe 110 and is disposed in the second opening 121 of the valve seat 120. Further, the inner wall of the second opening 121 can adopt a stepped structure, thereby forming a limiting step for limiting the branch pipe 400, preventing the branch pipe 400 from being over-inserted, and facilitating the assembly of the branch pipe 400.

[0040] like Figure 9 As shown, in one embodiment of this disclosure, a first bearing 321 may be provided between the screw 320 and the valve seat assembly. For example, the valve seat assembly may also include a valve cover 130 disposed at the end of the valve tube 110 away from the base 500 (refer to the upper end shown in the figure), through which the screw 320 passes, and the first bearing 321 may be disposed between the screw 320 and the valve cover 130. Through the above structural design, this disclosure utilizes the first bearing 321 to make the relative rotation of the screw 320 in the valve seat assembly smoother.

[0041] like Figure 3 and Figure 9 As shown, in one embodiment of this disclosure, the drive member 310 is connected to a drive rod 330, and the drive member 310 can drive the drive rod 330 to rotate. The drive rod 330 extends axially and is located on the side of the screw 320 away from the base 500. The drive rod 330 maintains a constant relative position with the valve seat assembly axially. Based on this, the drive rod 330 and the screw 320 can be connected by a reduction gear assembly. Through the above structural design, this disclosure achieves a reduction gear transmission design between the drive member 310 and the screw 320, enabling the drive member 310 to amplify the torque of the screw, thereby solving the problem of difficulty in opening the valve caused by the direct drive of the sealing block in traditional gate valves.

[0042] like Figure 9As shown, in one embodiment of this disclosure, the reduction gear assembly may include a first gear 341, a second gear 342, and a third gear 343. Specifically, the first gear 341 is disposed on the drive rod 330, the second gear 342 is disposed on the screw 320, and the third gear 343 is rotatably disposed on the valve seat assembly. The outer diameter of the first gear 341 is smaller than the outer diameter of the second gear 342, and the third gear 343 is a T-type gear. In other words, the third gear 343 has two gear portions that mesh with the first gear 341 and the second gear 342 respectively. These two gear portions are coaxial, and the outer diameter of the gear portion meshing with the first gear 341 is larger than the outer diameter of the gear portion meshing with the second gear 342, thereby realizing the reduction gear transmission function between the first gear 341 and the second gear 342.

[0043] like Figure 3 and Figure 9 As shown, in one embodiment of this disclosure, two second bearings 331 may be provided between the drive rod 330 and the valve seat assembly, and these two second bearings 331 are arranged axially spaced apart. For example, the valve seat assembly may also include a valve body 140 disposed at the end of the valve cover 130 away from the valve tube 110 (refer to the upper end shown in the figure), and the drive rod 330 is disposed in the valve body 140, then the second bearings 331 may be disposed between the drive rod 330 and the valve body 140. Through the above structural design, this disclosure utilizes the second bearings 331 to make the relative rotation of the drive rod 330 in the valve seat assembly smoother.

[0044] It should be noted that the shut-off valves shown in the accompanying drawings and described in this specification are merely a few examples among many shut-off valves capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the shut-off valves shown in the accompanying drawings or described in this specification.

[0045] In summary, the shut-off valve proposed in this disclosure includes a valve seat assembly, a valve core assembly, and a drive assembly; the valve seat assembly has a valve cavity 101, and valve ports are respectively provided on both sides of the valve seat assembly in a first direction; the valve core assembly is disposed in the valve cavity 101; the drive assembly can drive the valve core assembly to move up and down, so that when the valve core assembly moves down to a position between the two valve ports, the connection between the two valve ports is disconnected; the valve seat assembly is also provided with a base 500, which is located below the valve ports; the base 500 includes a base plate 510 and a limiting protrusion 520, the base plate 510 is connected to the valve seat assembly, and the limiting protrusion 520 is formed by the base plate 510 protruding upward, and the limiting protrusion 520 is located below the valve core assembly to realize the lower limit of the valve core assembly. Through the above structural design, this disclosure uses the base 500 to shorten the distance between the lower end of the valve seat assembly and the valve core assembly, reduces the length of the valve core assembly by limiting the lower position of the valve core assembly, and shortens the travel of the valve core assembly, which helps to meet the higher design requirements of the shut-off valve for lightweighting and miniaturization.

[0046] The exemplary embodiments of the shut-off valve proposed in this disclosure have been described and / or illustrated in detail above. However, the embodiments of this disclosure are not limited to the specific embodiments described herein; rather, components and / or steps of each embodiment may be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment may also be used in combination with other components and / or steps of other embodiments. In describing the elements / components / etc. described and / or illustrated herein, the terms “a,” “an,” and “the above” are used to indicate the presence of one or more elements / components / etc. The terms “comprising,” “including,” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to those listed. Furthermore, the terms “first” and “second” in the claims and description are used only as illustrative marks and are not intended to limit the numerical scope of the object.

[0047] Although the shut-off valves proposed in this disclosure have been described according to different specific embodiments, those skilled in the art will recognize that modifications may be made to the implementation of this disclosure within the spirit and scope of the claims.

Claims

1. A shut-off valve, characterized in that, The system includes a valve seat assembly, a valve core assembly, and a drive assembly. The valve seat assembly has a valve cavity (101), and valve ports are respectively provided on both sides of the valve seat assembly in a first direction. The valve core assembly is disposed in the valve cavity (101). The drive assembly can drive the valve core assembly to move up and down, so that when the valve core assembly moves down to a position between the two valve ports, the connection between the two valve ports is disconnected. The valve seat assembly is also provided with a base (500), which is located below the valve ports. The base (500) includes a base plate (510) and a limiting protrusion (520). The base plate (510) is connected to the valve seat assembly, and the limiting protrusion (520) is formed by the base plate (510) protruding upward. The limiting protrusion (520) is located below the valve core assembly to achieve the lower limit of the valve core assembly.

2. The shut-off valve according to claim 1, characterized in that, The valve port has an inner orifice near the valve cavity (101); the upper end of the limiting protrusion (520) is arranged at a height lower than the lower end of the inner orifice.

3. The shut-off valve according to claim 1, characterized in that, The sidewall of the limiting protrusion (520) has a cross-section including a straight segment (521) and a concave arc segment (522); the upper end of the straight segment (521) is connected to the upper wall of the limiting protrusion (520), the lower end is connected to the upper end of the arc segment (522), and the lower end of the arc segment (522) is connected to the base plate (510).

4. The shut-off valve according to claim 1, characterized in that, A first transition section (523) is provided between the side wall and the upper end wall of the limiting protrusion (520).

5. The shut-off valve according to claim 1, characterized in that, The base plate (510) has a flange (524) on its edge, which is bent away from the valve core assembly; the base plate (510) is connected to the valve seat assembly via the flange (524).

6. The shut-off valve according to claim 5, characterized in that, A second transition section (525) is provided between the base plate (510) and the flange (524).

7. The shut-off valve according to claim 1, characterized in that, The limiting protrusion (520) is formed by the base (500) through an integral stamping process.

8. The shut-off valve according to claim 1, characterized in that, The valve core assembly includes a nut (210) and a sealing structure (220) connected to the lower end of the nut (210); the drive assembly is disposed above the valve core assembly and includes a drive member (310) and a screw (320); the drive member (310) is disposed on the valve seat assembly and is used to drive the screw (320) to rotate; the screw (320) extends into the valve cavity (101) and is screwed into the nut (210).

9. The shut-off valve according to claim 8, characterized in that, The sealing structure (220) is connected to the nut (210) via a connector (230); the upper part of the connector (230) is connected to the nut (210), and the lower part of the connector (230) is provided with a through hole (231) extending along the first direction; the sealing structure (220) includes two sealing blocks (221) and an elastic element (222); the sealing block (221) includes a sealing part (2211) and a sleeve part (2212), the two sealing parts (2211) are respectively located on both sides of the connector (230) in the first direction, and are respectively arranged corresponding to the two valve ports, the two sleeve parts (2212) are sleeved on each other and pass through the through hole (231); the elastic element (222) connects the two sealing parts (2211) and is located inside the sleeve part (2212).

10. The shut-off valve according to claim 9, characterized in that, The valve seat assembly includes a valve tube (110) and two valve seats (120) disposed within the valve tube (110); the valve tube (110) is provided with two first openings (111); the two valve seats (120) are respectively arranged corresponding to the two first openings (111) and are respectively provided with second openings (121), the second openings (121) and the first openings (111) are arranged in a one-to-one correspondence, and the corresponding first openings (111) and second openings (121) together form the valve port; wherein, the two sealing parts (2211) block the first openings and / or the second openings, so that the two sealing parts (2211) restrict the circumferential position of the connector (230) and the nut (210) relative to the valve seat assembly.

11. The shut-off valve according to claim 10, characterized in that, The valve tube (110) has a third opening at its axial end away from the drive assembly; the base (500) is sealed in the third opening; the edge of the base plate (510) is provided with a flange (524), the flange (524) is bent away from the valve core assembly, and the base plate (510) is connected to the valve tube (110) via the flange (524); the limiting protrusion (520) extends to the position between the two valve seats (120).

12. The shut-off valve according to claim 10, characterized in that, The two valve ports are respectively connected to branch pipes (400), and the two branch pipes (400) are respectively connected to the valve chamber (101); the branch pipes (400) pass through the first opening (111) and are installed in the second opening (121).

13. The shut-off valve according to claim 8, characterized in that, A first bearing (321) is provided between the screw (320) and the valve seat assembly.

14. The shut-off valve according to claim 8, characterized in that, The drive member (310) is connected to the drive rod (330) and can drive the drive rod (330) to rotate; the drive rod (330) extends axially and is located on the side of the screw (320) away from the base (500); the drive rod (330) maintains a constant relative position with the valve seat assembly along the axial direction; the drive rod (330) and the screw (320) are connected by a reduction gear assembly.

15. The shut-off valve according to claim 14, characterized in that, Two second bearings (331) are provided between the drive rod (330) and the valve seat assembly, and the two second bearings (331) are arranged axially spaced apart.

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