Stop valve

Abstract

The stop valve (100) includes a valve body (110) and a valve core (130). A valve cavity (110a) and a mounting cavity (110b) are installed within the valve body. The mounting cavity (110b) communicates with the valve cavity (110a). The valve core (130) is mounted within the mounting cavity (110b) and moves within the mounting cavity (110b) to extend into the valve cavity (110a) and can turn the stop valve (100) on / off. The stop valve (100) further includes a female threaded sleeve (140). The female threaded sleeve (140) is located within the mounting cavity (110b) and is installed so as to be close to the valve cavity (110a). The valve core (130) and the female threaded sleeve (140) are threaded together.

Description

Technology Field

[0001] This application claims priority to a Chinese patent application filed on November 22, 2021, with application number 202122876117.4 and title of the invention "stop valve". This is incorporated herein by reference in its entirety.

[0002] This application relates to the field of refrigeration technology, and more specifically to stop valves. Background Technology

[0003] Stop valves are also referred to as globe valves. As a type of forced-seal valve, they play a crucial role in shutting off and throttling the medium within the pipeline. Conventional stop valves typically include a valve body and a valve core. The valve core is mounted on the valve body, and male threads are installed on the valve core. Female threads that match the male threads are installed on the valve body. Through the screw engagement of the male and female threads, the valve core moves within the valve body to enable the stop valve to be turned on or off. In conventional brass stop valves, the female threads are typically installed within the valve cavity of the valve body. As the medium flows, the female threads in the valve body become damaged due to long-term impact and corrosion, causing the rotation of the valve body to become blocked. To address this technical problem, some conventional technologies install the female thread section within the valve body port or partially elevate it outside the valve body port. This protects the female thread section from medium impact and extends its service life. However, the male thread section that aligns with the female thread section on the valve core must also extend at least partially outside the valve body. Consequently, the valve core length increases, and more material is required for machining. Furthermore, to achieve sealing between the valve core and the valve body or valve seat, and to ensure stability during valve core movement, a more complex structure must be designed on the valve core. Additionally, since this must be fitted with more components, the difficulty of machining and assembling the stop valve increases, and production efficiency decreases.

[0004] A stop valve is provided according to various embodiments of the present application.

[0005] The stop valve of the present application comprises a valve body and a valve core. A valve cavity and a mounting cavity are installed within the valve body. The mounting cavity communicates with the valve cavity. The valve core is mounted within the mounting cavity and moves within the mounting cavity to extend into the valve cavity, thereby enabling the stop valve to be turned on / off. The stop valve further comprises a female threaded sleeve. The female threaded sleeve is located within the mounting cavity and is installed in close proximity to the valve cavity. The valve core and the female threaded sleeve are threadedly connected.

[0006] In some embodiments, a port is opened in the mounting cavity on one side far from the valve cavity. A position limiting member is installed in the port. An upper position limiting member is installed in the valve core. The position limiting member stops the upper position limiting member to limit the movement stroke of the valve core toward the port direction. This prevents the valve core from disengaging from the valve body and affecting the normal operation of the stop valve.

[0007] In some embodiments, the valve core has a cross-section at one end far from the valve cavity that forms the upper position limiting portion. The upper position limiting portion is formed using the cross-section of the valve core itself, eliminating the need to install a separate upper position limiting portion on the valve core. This simplifies the structure and reduces manufacturing costs. Additionally, the cross-section of the valve core is stopped. The valve core moves outward from the valve body to the maximum stroke point and does not extend beyond the port. Thus, the range of movement of the valve core is limited to within the valve body, protecting the valve core from damage by external materials. Furthermore, the valve core length and the overall dimensions of the stop valve are further reduced.

[0008] In some embodiments, the position limiting member includes a position limiting ring that extends circumferentially along the inner wall of the valve body. The valve core adopts a soft metal material and has a truncated cone structure at one end far from the valve cavity. The side of the truncated cone structure and the inner ring line of the position limiting ring come into contact to form a line-plane seal structure. Since the soft metal material has relatively low hardness, a soft texture, and deforms relatively easily during extrusion, a relatively excellent sealing effect can be obtained. In this technical solution, material costs are reduced because the custom seal between the valve core and the position limiting ring itself is utilized without the need to install additional sealing members. Furthermore, since there is no need to create recesses or grooves to accommodate sealing members in the valve core or valve body, the structure is simple, the difficulty of machining and assembly is low, and the strength of the members is guaranteed. At the same time, there is no need to worry about the problem of sealing members falling off or aging affecting sealing performance, maintenance frequency is reduced, user experience is improved, and service life is extended.

[0009] In some embodiments, the valve core includes a valve stem and a seal. The valve stem is provided with male threads and is installed to penetrate the female thread sleeve. The valve stem is provided with a seal on one side adjacent to the valve cavity. The seal is made of a soft metal material. The seal extends into the valve cavity and switches the stop valve on and off. The soft metal material has relatively low hardness, a soft texture, and deforms relatively easily during extrusion. Therefore, a relatively excellent sealing effect can be obtained at the valve port point. In this technical solution, material costs are reduced because the seal and the valve port are directly fitted together without the need to install additional sealing members. Furthermore, since there is no need to create recesses or grooves in the valve core or valve body to accommodate the sealing member, the structure is simple, the difficulty of machining and assembly is low, and the strength of the member is guaranteed. At the same time, there is no need to worry about the issue of the sealing member falling off or aging affecting sealing performance, maintenance frequency is reduced, user experience is improved, and service life is extended.

[0010] In some embodiments, the valve core further includes a head portion. The head portion is installed at one end of the valve stem far from the valve cavity. The valve body restricts the position of the head portion in a circumferential direction. A female threaded sleeve is screw-coupled with a screw rod and also serves to restrict the position of the screw rod in a circumferential direction. Thus, two spaced circumferential positioning portions are formed along the axial direction of the valve core. This allows the valve core to move along a restricted path in the valve body and ensures stability during movement.

[0011] In some embodiments, the outer diameter of the head portion is larger than the outer diameter of the valve stem, so that a protruding ring is formed between the head portion and the valve stem. The upper surface of the female threaded sleeve stops the protruding ring to limit the movement stroke of the valve core toward the valve seat direction. The protruding ring contacts the upper surface of the female threaded sleeve. Additionally, a position limit is formed using the structure of the head portion itself and the upper surface of the female threaded sleeve. This eliminates the need to separately install a lower position limiting portion on the valve core, thereby simplifying the valve core structure and reducing material and processing costs.

[0012] In some embodiments, a sealing ring is installed between the head portion and the valve body to form a circumferential seal on the head portion and the valve body. This seals the valve body, preventing leakage of the medium during circulation.

[0013] In some embodiments, the female threaded sleeve and the stop valve are installed separately and fixedly connected. This reduces the machining process of the valve body and lowers the difficulty of machining the valve body.

[0014] In some embodiments, a second opening is provided on the side of the valve body. The projection of the female thread sleeve onto the valve body along the radial direction of the valve body does not overlap with the projection of the second opening onto the valve body along the radial direction of the valve body. Thus, the female thread sleeve prevents the obstruction of medium flow or the generation of flow noise.

[0015] Details regarding one or more embodiments according to the present application are provided in the following accompanying drawings and description. Other features, purposes, and advantages of the present application are clearly explained through the specification, accompanying drawings, and claims. Brief explanation of the drawing

[0016] To better explain and interpret the embodiments and / or examples of the invention disclosed herein, reference may be made to one or more of the accompanying drawings. Additional details or examples used in the description of the accompanying drawings shall not be construed as limiting the scope of any of the disclosed invention, the embodiments and / or examples described herein, or the most preferred forms of the invention as currently understood. FIG. 1 is a three-dimensional structural diagram of a stop valve according to one embodiment of the present application. FIG. 2 is a cross-sectional view of a stop valve according to an embodiment of the present application. Figure 3 is a partial enlarged view of point A in Figure 2. Figure 4 is a partial enlarged view of point B in Figure 2. FIG. 5 is a cross-sectional view of a valve body according to an embodiment of the present application. Specific details for implementing the invention

[0017] Hereinafter, the technical solution of the embodiments of the present application is interpreted and described with reference to the attached drawings of the embodiments of the present application. However, the following embodiments are merely preferred embodiments of the embodiments of the present application and are not all thereof. Based on the embodiments in the manner of practice, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0018] Furthermore, the terms "first" and "second" are used solely for illustrative purposes and should not be understood as implying or suggesting relative importance, or as implicitly indicating the quantity of the technical features referred to. The features limited to "first" and "second" herein may explicitly or implicitly include one or more of said features. Unless otherwise specified in the description of this application, "plural" means two or more.

[0019] In this application, terms such as “mounting,” “connecting,” “linking,” and “fixing” should be understood in a broad sense, unless otherwise explicitly defined and limited. For example, a connection may be fixed, detachable, or integral. A connection may be mechanical or electrical. A connection may be direct, indirect, or intermediary. A person skilled in the art will understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] In the present application, unless otherwise explicitly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or it may include the first feature and the second feature not being in direct contact but being in contact by another feature between them. Additionally, the first feature being "above," "upper," and "upper surface" of the second feature may include the first feature being directly above and obliquely above the second feature, or it may simply indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below," "lower," and "lower surface" of the second feature may include the first feature being directly below and obliquely below the second feature, or it may simply indicate that the horizontal height of the first feature is lower than that of the second feature.

[0021] In this embodiment, when directional terms such as up, down, left, and right are mentioned, the stop valve is assumed to be in a vertically mounted state as depicted in the attached drawings as the default. When an axial direction is mentioned, it is assumed to follow the central axis direction of the valve core as the default. This will not be explained repeatedly below.

[0022] The stop valve of the present application will be described in more detail below with reference to the attached drawings and specific embodiments.

[0023] The present application provides a stop valve (100). The stop valve (100) may be applied to a refrigeration system of an air conditioner. The refrigeration system lowers the temperature by circulating heat through a refrigerant in a circulation system. The stop valve (100) is mounted in a medium passage and is used to control the blocking and flow of the passage and to replenish the medium in the refrigeration system.

[0024] The stop valve (100) includes a hollow valve body (110), a valve seat (120), and a valve core (130). A valve cavity (110a) and a mounting cavity (110b) are installed within the valve body (110). The mounting cavity (110b) is in communication with the valve cavity (110a).

[0025] The valve seat (120) is installed within the valve body (110) and is located on one side facing away from the mounting cavity (110b) of the valve cavity (110a). A valve port (121) is opened in the valve seat (120). The valve core (130) is mounted in the valve body (110) within the mounting cavity (110b) and moves within the valve body (110) to extend into the valve cavity (110a) to turn the stop valve on / off.

[0026] Conventional brass stop valves are relatively expensive. Therefore, the valve body (110) of the present application adopts a stainless steel valve body (110).

[0027] The valve body (110) includes a port (111), a first opening (112), and a second opening (113). Referring to FIGS. 2 and FIGS. 5, in this embodiment, the port (111) is located on the upper side of the valve body (110), that is, on one side of the port (111) mounting cavity (110b) far from the valve cavity (110a). The first opening (112) and the second opening (113) are opened on the lower side and right side of the valve body (110), respectively. The space between the first opening (112) and the second opening (113) forms the valve cavity (110a). A valve seat (120) is located at the point of the first opening (112). A first connecting pipe (180) is connected to the first opening (112) on one side far from the valve body (110). The first opening (112) is connected to the outside through the first connecting pipe (180). The second opening (113) is connected to the second connecting pipe (190) on one side far from the valve body (110). The second opening (113) is connected to the outside through the second connecting pipe (190). The first connecting pipe (180) and the second connecting pipe (190) are each used as an inlet or outlet of the medium. When the first connecting pipe (180) is used as an inlet of the medium, the medium flows from the first connecting pipe (180) into the stop valve (100) and flows into the valve body (110) through the first opening (112). When the stop valve (100) is open, the medium passes through the second opening (113) and exits from the stop valve (100) via the second connecting pipe (190). The opposite case is also the same. The medium can flow from the second connecting pipe (190) through the second opening (113) into the valve body (110), and then flow out of the stop valve (100) through the first opening (112) and the first connecting pipe (180).

[0028] Optionally, the locations of the first opening (112) and the second opening (113) are not limited to being opened on the lower and right sides of the valve body (110) in this embodiment. In other embodiments, the first opening (112) and the second opening (113) may be installed on the left and right sides, the upper and lower sides, etc., of the valve body (110). This is provided only that communication or blocking between the two valve ports can be achieved through the axial movement of the valve core.

[0029] In order to drive the valve core (130) so that it can move smoothly within the valve body (110), the valve core (130) is provided with an actuating part (132) for operating the valve core (130) at a location close to the port (111). At the same time, the valve core (130) includes a valve stem (131) having a male thread (1311). The valve body (110) is provided with a female thread that fits the male thread (1311). In a conventional brass stop valve, the female thread of the valve body (110) opens directly into the valve cavity (110a) of the valve body (110). However, the female thread at the valve cavity (110a) may be damaged due to prolonged impact and corrosion of the medium.

[0030] The present application adopts a stainless steel material for the valve body (110). Directly machining threads on the stainless steel valve body (110) is relatively difficult and there is a relatively high demand for the valve body (110). Therefore, an additional female thread sleeve (140) must be installed within the stainless steel valve body (110). The valve core (130) is installed through the female thread sleeve (140) and screw-coupled with the female thread sleeve (140) to drive the valve core (130) to move within the valve body (110). While the female thread sleeve (140) screw-couples with the valve stem (131), it also performs the roles of axial guidance and circumferential position limitation for the valve stem (131). In the prior art, the female thread sleeve (140) is generally installed in the valve body (110) port (111) or partially installed high outside the valve body (110) port (111). Accordingly, the male thread (1311) that fits the female thread sleeve (140) is also generally installed partially high at the outer end of the port (111) and extends partially out of the port (111). This results in a longer valve core (130) and requires more material for machining.

[0031] In order to shorten the length of the valve core (130), according to one embodiment of the present application, the female thread sleeve (140) is positioned within the mounting cavity (110b) and installed so as to be close to the valve cavity (110a). The valve core (130) is threaded to the female thread sleeve (140). The aforementioned mounting position of the female thread sleeve (140) prevents the female threads of the female thread sleeve (140) from being impacted by the medium and corroded. At the same time, the fitting section between the valve body (110) and the female thread sleeve (140) is also located within the valve body (110). This can improve stability during the movement of the valve core (130). Additionally, the fitting section between the valve body (110) and the female thread sleeve (140) is also located within the valve body (110). Therefore, the valve core (130) can be designed to be relatively short, thereby reducing the overall dimensions of the stop valve and saving processing materials.

[0032] In some embodiments, the projection of the female thread sleeve (140) onto the valve body (110) along the radial direction of the valve body (110) is controlled so as not to overlap with the projection of the second opening (113) onto the valve body (110) along the radial direction of the valve body (110). In this way, the female thread sleeve (140) can be prevented from obstructing the flow of the medium or generating flow noise.

[0033] In order to adjust the position of the female thread sleeve (140) as needed and to facilitate assembly and replacement, the female thread sleeve (140) and the valve body (110) of this embodiment may be installed separately, as shown in FIGS. 2 and 4. Additionally, by fixing them to the inner wall of the valve body (110) through a method such as welding, the machining process of the valve body (110) is reduced and the difficulty of machining the valve body (110) is lowered. Of course, the female thread sleeve (140) and the valve body (110) may be molded as a single unit to facilitate production and machining and to simplify installation.

[0034] The valve core (130) can be designed to be shorter as the female threaded sleeve (140) approaches the valve port (121) without affecting the opening and closing of the valve port (121) or the normal flow of the medium. In some embodiments of the present application, the female threaded sleeve (140) is installed very close to the valve cavity (110a) to shorten the length of the valve core (130) as much as possible.

[0035] Of course, in other embodiments, the female thread sleeve (140) may be installed at other locations in the valve body (110) as needed, for example, at an intermediate location between the valve cavity (110a) and the port (111).

[0036] Referring to FIG. 2, the valve core (130) of the present embodiment includes a head portion (133), a valve stem (131), and a seal portion (134). A male screw thread (1311) is installed on the valve stem (131). The head portion (133) and the seal portion (134) are installed at both ends of the valve stem (131), respectively. Specifically, the seal portion (134) is installed at one end adjacent to the valve cavity (110a) and is inserted into the valve port (121) through axial movement of the valve core (130) to achieve closure of the valve port (121). To facilitate the insertion of the seal portion (134), the seal portion (134) adopts an inverted truncated cone structure or a necking structure with a reduced lower end. To prevent the valve core (130) from moving uncontrollably into the valve port (121) and damaging the valve seat (120) or the valve core (130), a lower position limiting member is installed in the valve body (110). When the valve port (121) is closed, the upper surface of the female thread sleeve (140) stops the lower position limiting member, thereby limiting the movement stroke of the valve core (130) toward the valve seat (120). The female thread sleeve (140) is an integrated multi-purpose unit and does not require a separate stop, which simplifies the internal structure of the valve body (110) and reduces material and processing costs.

[0037] The head portion (133) is installed at one end close to the port (111). That is, the head portion (133) is connected to one end far from the valve cavity (110a) of the valve stem (131). Referring to FIG. 2, in order to improve stability after the valve core (130) is mounted within the valve body (110), the head portion (133) and the valve body (110) are positionally restricted. Additionally, by combining the positional restriction of the valve core (130) of the female thread sleeve (140), two spaced-apart positional restriction portions are formed on the axial direction of the valve core (130). This allows the valve core (130) to move along a restricted path within the valve body (110) and ensures stability during movement.

[0038] In this embodiment, the outer wall of the head portion (133) and the inner wall of the valve body (110) are directly position-limited, and a female threaded sleeve (140) is installed between the valve stem (131) and the inner wall of the valve body (110). Therefore, the radial length of the head portion (133) is longer than the radial length of the valve stem (131). A protruding ring (135) is formed between the head portion (133) and the valve stem (131), and the protruding ring (135) forms a lower position limiting portion. Position limiting is formed using the structure of the head portion (133) itself and the upper surface of the female threaded sleeve (140), so there is no need to install a separate lower position limiting portion on the valve core (130). Therefore, the valve core structure is simplified, and material and processing costs are reduced.

[0039] Of course, in other embodiments, an auxiliary position limiting member may be installed to cover the outside of the head part, thereby indirectly limiting the position of the head part and the valve body (110).

[0040] Referring to FIG. 2, in this embodiment, the operating part (132) of the valve core (130) is a hollow structure extending inward from the upper surface of the head part (133). In order to be suitable for tools such as a hexagonal wrench, a plurality of flat surfaces are spaced apart and uniformly distributed on the inner surface of the operating part (132).

[0041] In another embodiment, to suit an irregularly shaped spanner, the planes of the inner surface of the operating part may be uniformly distributed without spacing.

[0042] When the valve port (121) needs to be closed, the valve stem (131) is screwed forward against the female thread sleeve (140). The valve stem (131) moves downward axially against the female thread, driving the seal portion (134) and the head portion (133) to move downward. This proceeds until the seal portion (134) is inserted deep into the valve port (121) and the closure of the valve port (121) is achieved, and until the protruding ring (135) contacts the top of the female thread sleeve (140), thereby restricting the axial downward movement of the valve core (130).

[0043] When the valve port (121) needs to be opened, the valve stem (131) is screwed in reverse to the female threaded sleeve (140). The valve stem (131) moves upward to the female threaded sleeve (140), driving the seal (134) and the head (133) to move upward. The seal (134) is disengaged from the valve port (121) and continues to move axially upward to open a channel of a certain width. However, the valve core (130) does not move indiscriminately toward the valve port (121) so as not to disengage from the valve body (110) and affect the normal use of the stop valve (100). Therefore, the position of the axial upward movement stroke of the valve core (130) must be limited.

[0044] In this embodiment, as illustrated in FIGS. 2 and 3, a position limiting member (150) is installed in the valve body (110) and an upper position limiting member is installed in the valve core (130) to limit the movement stroke toward the port (111) of the valve core (130). When the valve port (121) is opened, the position limiting member (150) stops the upper position limiting member. Specifically, the position limiting member (150) is located inside the port (111). Additionally, when the valve core (130) moves upward in the axial direction and reaches the maximum stroke, it comes into contact with the upper surface of the valve core (130). The valve core (130) has a cross-section at one end far from the valve cavity (110a) that forms the upper position limiting member. More specifically, the position limiting member (150) comes into contact with the head portion (133). The upper surface of the head portion (133) is integrated and multi-purpose, so there is no need to additionally install an upper position limiting portion on the valve core (130). Therefore, the structure is simplified, and processing costs are reduced. In addition, the valve core (130) moves outward from the valve body (110) to reach the maximum stroke point and does not extend outside the port (111). Thus, the range of movement of the valve core (130) is limited within the valve body (110), protecting the valve core (130) from damage by external materials. Furthermore, the length of the valve core (130) and the overall dimensions of the stop valve are further reduced.

[0045] The position limiting member (150) may be installed separately from the inner wall of the valve body (110) and fixed to the inner wall of the valve body (110) by means such as welding. It may also be formed integrally with the inner wall of the valve body (110).

[0046] Referring to FIG. 2, in this embodiment, the sealing portion (134) and the head portion (133) can be installed integrally with the valve stem (131). This reduces the mounting steps and eliminates the custom structure.

[0047] Of course, in other embodiments, the sealing part and the head part may be installed separately from the valve stem to facilitate the machining of each component of the valve core. This allows for a reduction in the amount of material removed and an increase in machining efficiency.

[0048] The stop valve (100) has a relatively high level of sealing requirements. To prevent the medium from leaking at the valve port (121) when the valve port (121) is closed, the sealing part (134) and the valve port (121) must be sealed. In the relevant technology, a sealing structure, such as a copper sealing ring, must typically be additionally installed between the sealing part (134) and the valve port (121). This results in a complex sealing structure and poor sealing effect. In this embodiment, the material of the sealing part (134) is selected from a soft metal material such as metallic aluminum, zinc, lead, or silver. Soft metal materials have relatively low hardness, are soft, and are relatively prone to deformation during extrusion. Therefore, a relatively excellent sealing effect can be achieved at the valve port (121). Since the sealing part (134) and the valve port (121) are directly fitted and sealed, there is no need to additionally install a sealing member (174), thereby reducing material costs. In addition, there is no need to create a recess or similar structure to accommodate the sealing member (174) in the valve core (130) or valve body (110), so the structure is simplified, the difficulty of processing and assembly is low, and the strength of the member is guaranteed. At the same time, there is no need to worry about the sealing member (174) falling off or aging and affecting the sealing performance. This reduces the frequency of maintenance, improves the user experience, and extends the service life.

[0049] To prevent the medium from leaking out of the gap between the valve core (130) and the valve body (110), a sealing ring (160) is installed between the head portion (133) and the valve body (110), as shown in FIGS. 2 and 3. This seals the head portion (133) and the valve body (110) in a circumferential direction, thereby sealing the valve body (110). Specifically, a mounting groove (1331) is opened in a circumferential direction along the outer wall of the head portion (133). The inner ring of the sealing ring (160) is installed in the mounting groove (1331). The outer ring of the sealing ring (160) and the inner wall of the valve body (110) are press-fitted so that they can move up and down relative to the inner wall of the valve body (110).

[0050] In order to prevent leakage at the valve body (110) port (111) point when the valve port (121) is opened and the medium is circulated, the valve core (130) moves upward in the axial direction to reach the maximum stroke, and sealing is required at the point where the position limiting member (150) and the head part (133) come into contact. In related technology, a sealing structure, such as a copper sealing ring, must typically be additionally installed between the position limiting member (150) and the head part (133). This results in a complex sealing structure and reduced sealing effectiveness. In this embodiment, the position limiting member (150) is a position limiting ring that extends along the circumference of the inner wall of the valve body (110). The valve core (130) has a truncated cone structure at one end far from the valve cavity (110a) and is made of a soft metal material. That is, the head part (133) has a truncated cone structure at one end far from the valve core (130) and is made of a soft metal material. The side (133a) of the truncated cone structure contacts the inner ring line (150a) of the position limiting ring to form a line-plane seal structure. Since the soft metal material has relatively low hardness, a soft texture, and deforms relatively easily during extrusion, a relatively excellent sealing effect can be obtained. In this technical solution, material costs are reduced because the custom seal between the valve core (130) and the position limiting ring itself is utilized without the need to install an additional sealing member (174). Furthermore, since there is no need to create a recess or similar structure to accommodate the sealing member (174) in the valve core (130) or the valve body (110), the structure is simple, the difficulty of processing and assembly is low, and the strength of the member is guaranteed. At the same time, there is no need to worry about the problem of the sealing member (174) falling off or aging affecting the sealing performance, maintenance frequency is reduced, user experience is improved, and the service life is extended. In addition, by adopting a soft metal material for the head portion (133) to perform a cushioning function, the head portion (133) and the position limiting ring are prevented from colliding with each other.

[0051] The valve core (130) may adopt a soft metal material only for the head portion (133) and the seal portion (134), and the valve stem (131) may adopt a stainless steel material. This ensures the rigidity and hardness of the valve stem (131), thereby mitigating wear during screw connection and extending the service life of the valve core (130).

[0052] Of course, to facilitate mold opening, a soft metal material is adopted for the entire valve core (130) to facilitate injection molding.

[0053] Additionally, as illustrated in FIG. 2, the stop valve (100) further includes an air valve assembly (170). The air valve assembly (170) is connected to the valve body (110). In this embodiment, the air valve assembly (170) is installed to face the second opening (113). It is used as an air inlet or air outlet to replenish or discharge the medium to the entire refrigeration system. In another embodiment, the axis of the air valve assembly (170) may be installed perpendicular to the axis of the second opening (113). Additionally, the air valve assembly (170) may be installed at other locations on the body.

[0054] The air valve assembly (170) includes a connector (171). The connector (171) is connected to the valve body (110). The connector (171) is used as a channel through which a medium is injected into the valve body (110).

[0055] The air valve assembly (170) further comprises an air valve core (172), a casing (173), and a sealing member (174). The air valve core (172) is installed within the connector (171) to allow communication between the interior of the main body and the interior of the connector (171), or to block communication. The casing (173) is installed to cover the outer circumference of the connector (171) and is used to prevent external impurities from entering by protecting the air valve core (172). The sealing member (174) is located between the casing (173) and the connector (171) and fits the casing (173) to seal the connector (171).

[0056] Specifically, an elastic member (175) is installed at one end of the air valve core (172) and is used to reset the air valve core (172). When the air valve core (172) is not subjected to external pressure, it remains in a closed state. At this time, the connector (171) remains in a sealed state, blocking the inside of the valve body (110) from the outside. When the air valve core (172) is subjected to pressure, the air valve core (172) extrudes the elastic member (175). Additionally, by moving in a direction close to the main body to release the blockage, the inside of the main body and the inside of the connector (171) are connected. Thus, a medium can flow into the valve body (110) or flow out from the valve body (110).

[0057] The technical solution of the present application has the following beneficial effects. In this technical solution, the female thread sleeve is installed in the mounting cavity and is located close to the valve cavity. This prevents the female threads of the female thread sleeve from being impacted by the medium and corroded. At the same time, since the fitting section between the valve body and the female thread sleeve is also located within the valve body, the valve core can be designed to be relatively short, thereby saving machining material. Furthermore, stability during operation can be improved, and the overall dimensions of the stop valve can be reduced.

[0058] The technical features of the aforementioned embodiments may be combined arbitrarily. For the sake of brevity, not all possible combinations of technical features according to the aforementioned embodiments have been described; however, as long as there is no contradiction in the combination of technical features, they should all be considered to be within the scope described in this invention.

[0059] The foregoing embodiments represent various embodiments of the present application and are described in a relatively specific and detailed manner; however, they should not be understood as limiting the scope of the patent application. Those skilled in the art to which the present invention pertains should note that modifications and improvements can be made without departing from the spirit of the present application, and that all such modifications fall within the scope of protection of the present application. Accordingly, the scope of protection of the patent application is based on the appended claims. Explanation of the symbols

[0060] 100-Stop valve, 110-Valve body, 110a-Valve cavity, 110b-Mounting cavity, 111-Port, 112-First opening, 113-Second opening, 120-Valve seat, 121-Valve port, 130-Valve core, 131-Valve stem, 1311-Male thread, 132-Acting part, 133-Head part, 133a-Side, 1331-Mounting groove, 134-Sealing part, 135-Projection ring, 140-Female threaded sleeve, 150-Position limiting member, 150a-Internal ring line, 160-Sealing ring, 170-Air valve assembly, 171-Connector, 172-Air valve core, 173-Casing, 174-Sealing member, 175-Elastic member, 180-First connecting pipe, 190-Second connecting pipe.

Claims

Claim 1 A stop valve comprising a valve body and a valve core, wherein a valve cavity and a mounting cavity are installed within the valve body, the mounting cavity is in communication with the valve cavity, the valve core is mounted within the mounting cavity and moves within the mounting cavity to extend to the valve cavity and can turn the stop valve on / off, the stop valve further comprising a female threaded sleeve, wherein the female threaded sleeve is installed separately from the stop valve as a separate part from the mounting cavity and is fixedly connected to the mounting cavity, is positioned within the mounting cavity so as not to receive impact from a medium and is installed close to the valve cavity, and the valve core and the female threaded sleeve are threadedly connected. Claim 2 A stop valve according to claim 1, wherein the mounting cavity has a port opened on one side far from the valve cavity, a position limiting member is installed in the port, an upper position limiting part is installed in the valve core, and the position limiting member stops the upper position limiting part to limit the movement stroke toward the port direction of the valve core. Claim 3 In paragraph 2, the valve core is a stop valve in which a cross-section at one end far from the valve cavity forms the upper position limiting portion. Claim 4 A stop valve according to claim 3, wherein the position limiting member comprises a position limiting ring extending circumferentially along the inner wall of the valve body, the valve core adopts a soft metal material and has a truncated cone structure at one end far from the valve cavity, and the side of the truncated cone structure and the inner ring line of the position limiting ring come into contact to form a line-plane sealing structure. Claim 5 A stop valve according to any one of claims 1 to 4, wherein the valve core comprises a valve stem and a sealing portion, the valve stem is provided with male threads and is installed to penetrate the female threaded sleeve, the valve stem is provided with a sealing portion on one side adjacent to the valve cavity, the sealing portion is made of a soft metal material, and the sealing portion extends into the valve cavity and turns the stop valve on / off. Claim 6 A stop valve according to claim 5, wherein the valve core further comprises a head portion, the head portion is installed at one end of the valve stem far from the valve cavity, and the valve body restricts its position in a circumferential direction relative to the head portion. Claim 7 A stop valve according to claim 6, wherein the outer diameter of the head portion is larger than the outer diameter of the valve stem, so that a protruding ring is formed between the head portion and the valve stem, and the upper surface of the female threaded sleeve stops the protruding ring to limit the movement stroke of the valve core toward the valve seat direction. Claim 8 A stop valve according to claim 6, wherein a sealing member is installed between the head portion and the valve body to form a circumferential seal with respect to the head portion and the valve body. Claim 9 delete Claim 10 A stop valve according to claim 1, wherein a second opening is installed on the side of the valve body, and the projection of the female thread sleeve on the valve body along the radial direction of the valve body does not overlap with the projection of the second opening on the valve body along the radial direction of the valve body.

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