Stop valve

Abstract

The stop valve comprises a valve body and a valve needle assembly, the valve body is provided with a valve cavity and a valve port communicated with the valve cavity, the valve needle assembly comprises a screw and a valve needle piece arranged in the valve cavity, one end of the screw extends into the valve cavity and is movably connected with the end, away from the valve port, of the valve needle piece, and the other end of the screw extends into the valve cavity. The inner wall of the valve cavity is provided with an internal thread, and the screw rod is in threaded connection with the inner wall of the valve cavity so as to drive the valve needle part to move in the valve cavity and block or open the valve port. According to the stop valve, the screw rod is allowed to incline relative to the valve needle part through the movable connection of the screw rod and the valve needle part, and even if the screw rod inclines relative to the valve body due to a thread gap (coaxiality deviation of the screw rod and the valve body), the valve needle part does not incline relative to the valve body to the same degree along with the screw rod; even if the screw rod is in an inclined state, the driving effect on the valve needle piece can be guaranteed, the valve needle piece seals the valve port, and reliable driving on the valve needle piece and the blocking and sealing effect of the valve needle piece on the valve port are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a gate valve. Background Technology

[0002] Manual shut-off valves are widely used in automotive air conditioning systems to block refrigerant flow during repair or maintenance, thereby reducing refrigerant loss and improving operational safety. Traditional manual shut-off valves typically consist of a valve body, a valve needle, and a screw. The valve needle and screw are integrated, and the screw is threaded to the valve body. Rotating the screw drives the valve needle to move up and down, thus sealing or opening the valve cavity.

[0003] For threaded connections, to facilitate installation and avoid excessive friction, there is usually a gap between the internal and external threads. This gap can cause the thread axis to not completely coincide with the valve body axis, which can lead to problems such as the screw tilting and shifting, affecting the coaxiality of the screw and the valve body. Combined with the integrated design of the screw and the valve needle, the valve needle can also tilt and shift, affecting the sealing action and reliability of the valve needle. Utility Model Content

[0004] This utility model provides a shut-off valve to solve the problem that when the screw and valve needle are integrated, the valve needle will tilt and shift with the screw, which affects the sealing action and sealing reliability of the valve needle.

[0005] To achieve the above objectives, this utility model provides a shut-off valve, which includes a valve body and a valve needle assembly. The valve body has a valve cavity and a valve port communicating with the valve cavity. The valve needle assembly includes a screw and a valve needle component disposed in the valve cavity. One end of the screw extends into the valve cavity and is movably connected to the end of the valve needle component opposite to the valve port, so that the screw can be tilted relative to the valve needle component. The inner wall of the valve cavity has an internal thread, and the screw is threadedly connected to the inner wall of the valve cavity to drive the valve needle component to move in the valve cavity and block or open the valve port.

[0006] Furthermore, the valve needle has a receiving cavity on the side facing the screw, and one end of the screw includes a push section movably disposed within the receiving cavity.

[0007] Furthermore, the receiving cavity includes a through groove, which includes a limiting section that radially penetrates the valve needle and an open section formed at the end of the valve needle. A stop step is formed between the limiting section and the open section. One end of the screw that extends into the valve cavity includes a push section that is movably disposed in the limiting section. The outer periphery of the push section is stopped and engaged with the stop step.

[0008] Furthermore, the maximum axial length of the pushing section is less than the maximum axial length of the limiting section, and the relative position of the screw and the valve needle in the axial direction of the stop valve is adjustable.

[0009] Furthermore, the end face of the pushing section is a spherical surface.

[0010] Furthermore, the two sides of the through groove are provided with two sets of spaced limiting structures. The limiting structures include a first milling plate segment extending axially along the valve needle and a second milling plate segment extending radially along the valve needle. The area between the two second milling plate segments forms an opening segment, and the area between the two first milling plate segments forms a limiting segment. The connection between the second milling plate segment and the first milling plate segment forms a stop step.

[0011] Furthermore, the screw also includes a manual adjustment section, a threaded section, and an adapter section connected in sequence. The push section is connected to the adapter section on the side away from the threaded section. The manual adjustment section protrudes from the valve body. The threaded section is located outside the receiving cavity, and the outer periphery of the threaded section is threadedly connected to the inner wall of the valve cavity.

[0012] Furthermore, the valve needle and the valve port have a first abutting surface and a second abutting surface on the side that are close to each other. When the valve needle blocks the valve port, the first abutting surface and the second abutting surface abut together to form an annular sealing line or an annular sealing surface.

[0013] Furthermore, the first contact surface is an annular inclined surface or an annular arc surface, and / or the second contact surface is an annular inclined surface or an annular arc surface.

[0014] Furthermore, the valve body includes a first valve body and a second valve body that are connected to each other. The first valve body is threadedly connected to the screw, and the valve port is located in the second valve body. The interior of the second valve body is the valve cavity, and the valve port is located in the valve cavity.

[0015] Furthermore, the valve cavity includes an opening section and a flow cavity section. The opening section is located on the side of the flow cavity section closer to the valve cavity. The radial dimension of the opening section gradually increases in the direction from the valve cavity to the valve cavity. The opening section is the valve port.

[0016] Furthermore, the valve needle component has a plug head at one end facing the valve port, and an annular sealing groove is provided on the outer periphery of the plug head. The valve needle component also includes an annular seal, which is disposed in the annular sealing groove. The outer periphery of the annular seal protrudes from the plug head in the radial direction and seals with the valve port. The hardness of the annular seal is less than that of the valve port.

[0017] When adjustment is required, the operator of this gate valve rotates the screw, which, combined with the threaded connection between the screw and the valve body, moves the valve needle up and down, thus opening or closing the valve port. In this design, the screw and valve needle are separate components. The movable connection between the screw and the valve needle allows the screw to tilt relative to the valve needle. Even if the screw tilts relative to the valve body due to thread clearance (coaxiality misalignment between the screw and the valve body), the valve needle will not tilt to the same degree as the screw relative to the valve body. The degree of tilt of the valve needle relative to the valve body is less than that of the screw relative to the valve body. Even when tilted, the screw can still drive the valve needle, ensuring the valve needle seals the valve port. This avoids the problems of tilting and shifting of the valve needle with the screw, which affect the sealing action and reliability of the valve needle, as seen in existing technologies where the screw and valve needle are integrated. Therefore, the separate movable screw and valve needle can reduce the eccentricity of the valve needle caused by the thread clearance, ensuring reliable driving of the valve needle and the sealing effect of the valve needle on the valve port. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of the shut-off valve provided in an embodiment of the present invention is shown;

[0020] Figure 2 It shows Figure 1 A schematic diagram of the valve needle assembly in a shut-off valve;

[0021] Figure 3 It shows Figure 1 A cross-sectional view of the shut-off valve.

[0022] The above figures include the following reference numerals:

[0023] 10. Valve body; 101. Valve cavity; 102. Valve mouth; 10201. Second abutment surface; 1021. Opening section; 1022. Flow section; 11. First valve body; 12. Second valve body;

[0024] 20. Valve needle assembly;

[0025] 21. Screw; 211. Push section; 2101. Through groove; 21011. Limiting section; 21012. Open section; 212. Manual adjustment section; 213. Threaded section; 214. Adapter section;

[0026] 22. Valve needle; 2201. First contact surface; 221. Limiting structure; 2211. First milled plate section; 2212. Second milled plate section; 222. Sealing head; 2221. Variable diameter head; 2222. Limiting head; 223. Mating section; 224. Annular seal;

[0027] 30. Installation kit. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] like Figures 1 to 3 As shown, an embodiment of this utility model provides a shut-off valve, which includes a valve body 10 and a valve needle assembly 20. The valve body 10 has a valve cavity 101 and a valve port communicating with the valve cavity 101. The valve needle assembly 20 includes a screw 21 and a valve needle 22 disposed in the valve cavity 101. One end of the screw 21 extends into the valve cavity 101 and is movably connected to the end of the valve needle 22 opposite to the valve port, so that the screw 21 can be tilted relative to the valve needle 22. The inner wall of the valve cavity 101 has an internal thread, and the screw 21 is threadedly connected to the inner wall of the valve cavity 101 to drive the valve needle 22 to move in the valve cavity 101 and block or open the valve port.

[0030] When the shut-off valve of this embodiment needs to be adjusted, the operator rotates the screw 21 and, in conjunction with the threaded connection between the screw 21 and the inner wall of the valve body 10, drives the valve needle 22 to move up and down, thereby opening or closing the valve port. In this embodiment, the screw 21 and the valve needle 22 of the shut-off valve are separately configured. The screw 21 and the valve needle 22 are movably connected, allowing the screw 21 to tilt relative to the valve needle 22. Even if the screw 21 tilts relative to the valve body 10 due to thread clearance (coaxiality offset between the screw 21 and the valve body 10), the valve needle 22 will not tilt relative to the valve body 10 to the same degree as the screw 21. The degree of tilt of the valve needle relative to the valve body is less than that of the screw relative to the valve body. Even when the screw 21 is tilted relative to the valve needle 22, it can still drive the valve needle 22, and the valve needle 22 can also seal the valve port. This avoids the problems in the prior art where the screw 21 and the valve needle are integrated, such as the valve needle 22 tilting and shifting with the screw 21, which affects the sealing action and sealing reliability of the valve needle 22. Therefore, the separate movable screw 21 and valve needle 22 can reduce the eccentricity of the valve needle 22 caused by the thread clearance, ensuring reliable driving of the valve needle 22 and the sealing effect of the valve needle 22 on the valve port.

[0031] The valve needle 22 has a receiving cavity on the side facing the screw 21, and one end of the screw 21 includes a push section 211 movably disposed within the receiving cavity. This arrangement facilitates the easy installation of the end of the screw 21 through the receiving cavity, and also helps to reduce the length of the assembled valve needle 22 and screw 21.

[0032] Specifically, the receiving groove includes a through groove 2101, which includes a limiting section 21011 that radially penetrates the valve needle 22 and an opening section 21012 formed at the end of the valve needle 22. A stop step is formed between the limiting section 21011 and the opening section 21012. One end of the screw 21 that extends into the valve cavity 101 includes a pushing section 211 that is movably disposed in the limiting section 21011. The outer periphery of the pushing section 211 is stopped and engaged with the stop step.

[0033] In this embodiment, as Figure 2 and Figure 3As shown, the receiving groove includes a through groove 2101 that radially penetrates the valve needle 22 (i.e., both the limiting section 21011 and the opening section 21012 radially penetrate the valve needle 22). The through groove 2101 allows the screw 21 to swing and tilt slightly relative to the valve needle 22, with the tilt direction being the through direction of the through groove 2101. This solves the problem that when the screw and valve needle are integrally installed, the valve needle 22 may tilt and shift with the screw 21, affecting the sealing action and sealing reliability of the valve needle 22. Furthermore, by segmenting the through groove 2101, it is beneficial to limit the installation of the pushing section 211 and prevent the pushing section 211 from coming out of the through groove 2101 after installation, ensuring the reliability and stability of the movable connection between the screw 21 and the valve needle 22.

[0034] like Figure 3 As shown, the maximum axial length of the pushing section 211 is less than the maximum axial length of the limiting section 21011, and the relative position of the screw 21 and the valve needle 22 in the axial direction of the shut-off valve is adjustable. This design avoids the situation where the pushing section 211 is limited by its size and cannot swing or tilt within the limiting section 21011 when the axial lengths of the pushing section 211 and the limiting section 21011 are the same, i.e., when the dimensions of the limiting section 21011 and the pushing section 211 are perfectly matched. This provides a certain amount of reserved space for the swing of the screw 21 relative to the valve needle 22, ensuring the reliability of the movable connection between the screw 21 and the valve needle 22, as well as the reliability of the screw 21 effectively pushing the valve needle 22 even when tilted.

[0035] like Figure 2 and Figure 3 As shown, the end face of the pushing section 211 is a spherical surface. This design facilitates the pushing of the pushing section 211 against the valve needle 22. Even if the screw 21 is slightly tilted, the spherical surface can automatically guide the screw 21 to correct the eccentric tilt of the screw 21. Furthermore, the spherical surface can ensure the contact position between the screw 21 and the valve needle 22 and the pushing effect of the screw 21 on the valve needle 22 towards the valve port when the screw 21 is tilted.

[0036] The through groove 2101 has two sets of spaced limiting structures 221 on both sides. Each limiting structure 221 includes a first milled plate segment 2211 extending axially along the valve needle 22 and a second milled plate segment 2212 extending radially along the valve needle 22. The area between the two second milled plate segments 2212 forms an opening segment 21012, and the area between the two first milled plate segments 2211 forms a limiting segment 21011. A stop step is formed at the connection between the second milled plate segment 2212 and the first milled plate segment 2211. This arrangement facilitates the machining of the through groove 2101 and the forming of the limiting structures 221, thereby improving machining efficiency and reducing machining costs.

[0037] Preferably, the through groove 2101 is a milled groove, and the valve needle 22 is milled on the side facing the screw 21 to form two sets of symmetrically spaced limiting structures 221.

[0038] like Figures 1 to 3 As shown, the screw 21 also includes a manual adjustment section 212, a threaded section 213 and an adapter section 214 connected in sequence. The push section 211 is connected to the side of the adapter section 214 away from the threaded section 213. The manual adjustment section 212 protrudes from the valve body 10. The threaded section 213 is located outside the receiving cavity. The outer periphery of the threaded section 213 is threadedly connected to the inner wall of the valve cavity 101.

[0039] In this embodiment, the adapter section 214 passes through the opening section 21012. The push section 211 and threaded section 213 connected to both sides of the adapter section 214 respectively cooperate with the inner and outer surfaces of the second milling plate section 2212. The operator can manually rotate the screw 21 through the manual adjustment section 212. Combined with the threaded connection between the threaded section 213 and the inner wall of the valve cavity 101, the valve needle 22 moves within the valve cavity 101, thereby opening or closing the valve port. This configuration allows the operator to easily move the valve needle 22 up and down through the manual adjustment section 212. The threaded section 213 and adapter section 214 ensure accurate alignment and stable connection of the valve needle 22, achieving a stable connection between the screw 21 and the valve body 10 and convenient manual operation. The outer periphery of the manual adjustment section 212 can be rectangular or other shapes that are easy for the operator to hold. The axial length of the transition section 214 is greater than the axial length of the opening section 21012 to ensure that the relative position of the screw 21 and the valve needle 22 in the axial direction of the shut-off valve is adjustable.

[0040] like Figure 3 As shown, the valve needle 22 and the valve port have a first abutment surface 2201 and a second abutment surface 10201 on their respective sides. When the valve needle 22 blocks the valve port, the first abutment surface 2201 and the second abutment surface 10201 abut to form an annular sealing line or annular sealing surface. This configuration, through the precise cooperation of the first abutment surface 2201 and the second abutment surface 10201, forms a stable and reliable sealing structure, ensuring an effective sealing effect. The design of the annular sealing line or annular sealing surface is beneficial for further sealing the contact area and sealing effect between the plug head 222 and the valve port, ensuring that the shut-off valve has no leakage in the closed state, and helping to guarantee the reliability and stability of the sealing.

[0041] Specifically, the first abutment surface 2201 is an annular inclined surface or an annular arc surface, and / or, the second abutment surface 10201 is an annular inclined surface or an annular arc surface. This configuration, using an annular inclined surface or an annular arc surface as the abutment surface, ensures that the annular sealing line or annular sealing surface between the valve needle 22 and the valve port is formed by the contact of the abutment surfaces. This provides a good sealing effect while avoiding the damage that can easily occur to the structure of the abutment surface when the valve needle 22 and the valve port are in contact with the abutment surface and the abutment line, since the structure where the abutment line is located is usually a corner or edge. This helps to improve the service life of the valve needle 22 and the valve port. At the same time, this setting can also determine the sealing position of the valve needle 22 based on the two abutting surfaces that abut against each other, and obtain the required annular sealing line or annular sealing surface by processing different abutting surfaces. Specifically, when the first abutting surface 2201 and the second abutting surface 10201 are two surfaces with different shapes, the abutting will mostly form an annular sealing line. When the first abutting surface 2201 and the second abutting surface 10201 are two surfaces with the same shape, the abutting will mostly form an annular sealing surface.

[0042] In this embodiment, the valve body 10 includes a first valve body 11 and a second valve body 12 connected to each other. The first valve body 11 is threadedly connected to the screw 21, and the valve port is located in the second valve body 12. The interior of the second valve body 12 is a valve cavity 102, and the valve port is located in the valve cavity 102. Specifically, the first valve body 11 has multiple flow ports in its circumferential direction, and the end of the first valve body 11 has an opening. The second valve body 12 is located at the end opening of the first valve body 11. The area inside the first valve body 11 forms a valve cavity 101, and the area inside the second valve body 12 forms a valve cavity 102. This configuration facilitates the processing and installation of the valve body 10.

[0043] In this embodiment, the valve cavity 102 includes an opening section 1021 and a flow cavity section 1022. The opening section 1021 is located on the side of the flow cavity section 1022 near the valve cavity 101, and the radial dimension of the opening section 1021 gradually increases in the direction from the valve cavity 102 toward the valve cavity 101. In this embodiment, the inner wall of the opening section 1021 forms a second abutment surface 10201, which is an annular arc surface. This design facilitates the forming of the annular arc surface of the second abutment surface 10201. Simultaneously, the gradual change in the opening section 1021 enables fluid guidance, and this design also helps reduce the impact force of the fluid, thereby improving the service life of the valve body 10.

[0044] Furthermore, the valve needle component 22 has a sealing head 222 at one end facing the valve mouth 102. The sealing head 222 has an annular sealing groove on its outer periphery. The valve needle component 22 also includes an annular sealing element 224, which is disposed in the annular sealing groove. The outer periphery of the annular sealing element 224 protrudes radially from the sealing head 222 and seals with the valve mouth. In this embodiment, the outer periphery of the annular sealing element 224 protrudes radially from the sealing head 222 and forms a first abutment surface 2201, which is an annular arc surface. This design facilitates the forming of the first abutment surface 2201, which is an annular arc surface. The second abutment surface 10201, which is an annular arc surface, abuts against the first abutment surface 2201, which is an annular arc surface, to form an annular sealing line. Through surface-to-surface contact, it provides a good sealing effect while improving the service life and sealing effect of the valve needle 22 and the valve port (valve mouth 102).

[0045] Preferably, the hardness of the annular seal 224 is less than that of the valve port to reduce or avoid structural damage that is easily caused during rigid sealing. For example, the annular seal 224 can be a soft, flexible structure, and the sealing effect of helium detection grade can be achieved by adaptively adjusting the compression ratio of the annular seal 224. This is beneficial to improving the applicability and sealing effect of the annular seal 224, while also being less prone to damage and ensuring the service life of the annular seal 224.

[0046] Preferably, the valve needle component 22 further includes a mating section 223, which is located between the sealing head 222 and the limiting structure 221, and the mating section 223 is at least partially sealed to the inner wall of the valve cavity 101.

[0047] It should be noted that the sealing head 222 includes a variable diameter head 2221 and a limiting head 2222. The variable diameter head 2221 is located on the side of the limiting head 2222 away from the valve port (valve cavity 102). The radial dimension of the variable diameter head 2221 gradually increases in the direction from the valve port (valve cavity 102) toward the valve cavity 101. An annular sealing groove is provided on the outer periphery of the limiting head 2222.

[0048] It is understandable that the annular seal 224 can also serve as one of the seals. Specifically, the outer periphery of the reducing head 2221 serves as the first contact surface 2201, which is an annular inclined surface. In this embodiment, the second contact surface 10201, which is an annular arc surface, abuts against the first contact surface 2201, which is an annular inclined surface, to form an annular sealing line. When the valve needle 22 blocks the valve port (valve cavity 102), the annular seal 224 seals against the inner wall of the flow cavity 1022. In this embodiment, when the valve needle 22 blocks the valve port (valve cavity 102), the limiting head 2222 extends into the flow cavity 1022 until the first contact surface 2201 abuts against the second contact surface 10201. The annular seal 224 is in close contact with the inner wall of the flow cavity 1022 to form an additional sealing layer, ensuring that the shut-off valve has no leakage in the closed state and maintains good sealing performance even in extreme environments. This configuration, through the cooperation of the annular seal 224 with the annular sealing groove and the sealing contact with the inner wall of the flow cavity section 1022, further enhances the sealing performance between the valve needle 22 and the valve port (valve cavity 102), ensuring a high-precision sealing effect under various working conditions.

[0049] Preferably, the valve needle component 22 further includes a mating section 223, which is located between the sealing head 222 and the limiting structure 221, and the mating section 223 is at least partially sealed to the inner wall of the valve cavity 101.

[0050] Preferably, the shut-off valve further includes a mounting sleeve 30, which is sleeved on the screw 21 protruding from the outer periphery of the valve body 10 and abuts or connects to the end of the valve body 10. The inner wall of the mounting sleeve 30 is at least partially sealed to the outer periphery of the screw 21.

[0051] In summary, this utility model provides a shut-off valve that is movably connected to the valve needle 22 via a screw 21, allowing the screw 21 to tilt relative to the valve needle 22. This solves the problem of misalignment of the coaxiality of both parts with the valve body 10 in threaded connections, which can lead to obstructed movement of the valve needle 22 or sealing failure, thus ensuring a good sealing effect. Furthermore, the milled through groove 2101 in the valve needle 22 provides a limiting installation area and a tilting swing area for the pushing section 211 and the transition section 214 of the screw 21, ensuring that the screw 21 can tilt slightly relative to the valve needle 22 without affecting the stable connection between them. On the other hand, the valve port (valve cavity 102) and the sealing head 222 adopt a soft bevel sealing design, which helps to improve the service life of the valve needle 22 and the valve port (valve cavity 102) while providing a good sealing effect. In addition, the annular seal 224 provides an additional seal for the valve port (valve cavity 102), further enhancing the sealing performance. This allows the shut-off valve of this application to effectively save refrigerant, reduce maintenance costs, and improve maintenance efficiency when applied to conditions such as automotive air conditioning pipeline maintenance.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shut-off valve, characterized in that, The shut-off valve includes a valve body (10) and a valve needle assembly (20). The valve body (10) has a valve cavity (101) and a valve port communicating with the valve cavity (101). The valve needle assembly (20) includes a screw (21) and a valve needle member (22) disposed in the valve cavity (101). One end of the screw (21) extends into the valve cavity (101) and is movably connected to the end of the valve needle member (22) away from the valve port, so that the screw (21) can be tilted relative to the valve needle member (22). The inner wall of the valve cavity (101) has an internal thread. The screw (21) is threadedly connected to the inner wall of the valve cavity (101) to drive the valve needle member (22) to move in the valve cavity (101) and block or open the valve port.

2. The shut-off valve according to claim 1, characterized in that, The valve needle (22) has a receiving cavity on the side facing the screw (21), and one end of the screw (21) includes a push section (211) movably disposed in the receiving cavity.

3. The shut-off valve according to claim 2, characterized in that, The receiving cavity includes a through groove (2101), which includes a limiting section (21011) that radially penetrates the valve needle (22) and an opening section (21012) formed at the end of the valve needle (22). A stop step is formed between the limiting section (21011) and the opening section (21012). One end of the screw (21) that extends into the valve cavity (101) includes a pushing section (211) that is movably disposed in the limiting section (21011). The outer periphery of the pushing section (211) is stopped and engaged with the stop step.

4. The shut-off valve according to claim 3, characterized in that, The maximum axial length of the pushing section (211) is less than the maximum axial length of the limiting section (21011), and the relative position of the screw (21) and the valve needle (22) in the axial direction of the shut-off valve is adjustable.

5. The shut-off valve according to claim 2 or 3, characterized in that, The end face of the pushing section (211) is spherical.

6. The shut-off valve according to claim 3, characterized in that, The through groove (2101) has two sets of spaced limiting structures (221) on both sides. The limiting structure (221) includes a first milling plate segment (2211) extending axially along the valve needle (22) and a second milling plate segment (2212) extending radially along the valve needle (22). The area between the two second milling plate segments (2212) forms the opening segment (21012), and the area between the two first milling plate segments (2211) forms the limiting segment (21011). The stop step is formed at the connection between the second milling plate segment (2212) and the first milling plate segment (2211).

7. The shut-off valve according to claim 2 or 3, characterized in that, The screw (21) also includes a manual adjustment section (212), a threaded section (213), and an adapter section (214) connected in sequence. The push section (211) is connected to the adapter section (214) on the side away from the threaded section (213). The manual adjustment section (212) protrudes from the valve body (10). The threaded section (213) is located outside the receiving cavity. The outer periphery of the threaded section (213) is threadedly connected to the inner wall of the valve cavity (101).

8. The shut-off valve according to claim 1, characterized in that, The valve needle (22) and the valve port have a first abutting surface (2201) and a second abutting surface (10201) respectively on the side that are close to each other. When the valve needle (22) blocks the valve port, the first abutting surface (2201) and the second abutting surface (10201) abut to form an annular sealing line or annular sealing surface.

9. The shut-off valve according to claim 8, characterized in that, The first contact surface (2201) is an annular inclined surface or an annular arc surface, and / or the second contact surface (10201) is an annular inclined surface or an annular arc surface.

10. The shut-off valve according to claim 1, characterized in that, The valve body (10) includes a first valve body (11) and a second valve body (12) connected to each other. The first valve body (11) is threadedly connected to the screw (21). The valve port is located in the second valve body (12). The interior of the second valve body (12) is a valve cavity (102). The valve port is located in the valve cavity (102).

11. The shut-off valve according to claim 10, characterized in that, The valve cavity (102) includes an opening section (1021) and a flow section (1022). The opening section (1021) is located on the side of the flow section (1022) close to the valve cavity (101). The radial dimension of the opening section (1021) gradually increases in the direction from the valve cavity (102) toward the valve cavity (101). The opening section (1021) is the valve port.

12. The shut-off valve according to claim 1, characterized in that, The valve needle (22) has a sealing head (222) at one end facing the valve port. The sealing head (222) has an annular sealing groove on its outer periphery. The valve needle (22) also includes an annular sealing element (224). The annular sealing element (224) is disposed in the annular sealing groove. The outer periphery of the annular sealing element (224) protrudes from the sealing head (222) in the radial direction and seals with the valve port. The hardness of the annular sealing element (224) is less than the hardness of the valve port.

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