Stop valve

Abstract

A stop valve. The stop valve comprises a valve body assembly (10) and a valve core assembly (20), wherein the valve body assembly (10) is provided with an assembly cavity (101), a first opening (102) and a second opening (103), and the first opening (102) is provided on the peripheral side of the valve body assembly (10). The valve core assembly (20) is at least partially mounted in the assembly cavity (101), and the valve core assembly (20) can be rotatably matched with the inner wall of the assembly cavity (101) in the circumferential direction of the assembly cavity (101). The valve core assembly (20) is provided with a ceramic section (21), and the ceramic section (21) is provided with a first flow-through cavity (201) and a first flow-through opening (202) which are in communication with each other, the first flow-through opening (202) being provided on the peripheral side of the ceramic section (21), and the first flow-through cavity (201) being in communication with the second opening (103).

Description

Stop valve

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 202411354356.5, filed on September 26, 2024, entitled "Stop valve", the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of stop valves, in particular to a stop valve. BACKGROUND

[0004] The stop valve is usually installed in an air conditioning unit, which usually includes a valve body and a valve core. The valve body is provided with a valve port, and the valve core is movably arranged in the valve body to open or close the valve port, thereby realizing the on-off of the air conditioning pipeline.

[0005] In the related art, the valve core and the valve body are threadedly connected, that is, the valve core is rotated to move towards the valve port to achieve closing. However, the valve core needs to be rotated for thousands of degrees during the closing process, resulting in slow closing speed of the valve core and the need to apply a large torque to achieve hard sealing with the valve port. In addition, the threaded connection structure is also prone to tooth slipping, thereby affecting the service life of the stop valve. SUMMARY

[0006] Therefore, it is necessary to provide a stop valve to solve the problem of slow response of the threaded connection between the valve body and the valve core in the existing stop valve.

[0007] The present application provides a stop valve, which includes a valve body assembly and a valve core assembly. The valve body assembly is provided with an assembly cavity, a first opening and a second opening. The first opening is provided on the peripheral side of the valve body assembly. The valve core assembly is at least partially installed in the assembly cavity and can be rotationally connected with the inner wall of the assembly cavity along the peripheral direction of the assembly cavity. The valve core assembly is provided with a ceramic segment. The ceramic segment is provided with a first flow-through cavity and a first flow-through port which are in communication with each other. The first flow-through port is provided on the peripheral side of the ceramic segment, and the first flow-through cavity is in communication with the second opening. With the rotation of the valve core assembly, the first flow-through port can be in communication with the first opening, or the first flow-through port can be arranged in a staggered manner with the first opening, so that the outer side wall of the ceramic segment can be sealed to the first opening to disconnect the communication between the first flow-through port and the first opening.

[0008] In one embodiment, the valve core assembly includes a valve rod part and a flow-through part. One end of the valve rod part is connected to the flow-through part and rotationally connected with the flow-through part along the peripheral direction. The flow-through part forms the ceramic segment.

[0009] In one of the embodiments, the first flow cavity is tapered, and the flow cross-sectional area of the first flow cavity gradually decreases along the axial direction of the valve core assembly from the flow portion to the valve stem portion; wherein the taper angle of the first flow cavity is defined as θ, and the taper angle θ of the first flow cavity satisfies 30°≤θ<180°.

[0010] In one of the embodiments, the angle between the axis of the first opening and the axis of the first flow opening is defined as β, and the angle β between the axis of the first opening and the axis of the first flow opening satisfies 90°<β≤180°.

[0011] In one of the embodiments, the stop valve further comprises a support portion, one end of the support portion is fixedly connected to the bottom wall of the assembly cavity, and the other end of the support portion extends into the first flow cavity and abuts against the inner wall of the first flow cavity; wherein the support portion is provided with a second flow cavity and a second flow opening which are in communication with each other, the second flow cavity has the same shape as the first flow cavity, and the second flow cavity is in communication with the second opening; with the rotation of the valve core assembly, the second flow opening can be coaxially arranged with the first flow opening and communicate the first opening through the first flow opening, or the second flow opening can be arranged in dislocation with the first flow opening, so that the outer side wall of the ceramic section can be blocked in the second flow opening to disconnect the communication between the second flow opening and the first flow opening.

[0012] In one of the embodiments, the valve body assembly comprises a first valve body and a second valve body, the second valve body is installed in the first valve body and is threadedly connected with the first valve body, the inner wall of the first valve body forms the bottom wall of the assembly cavity, the inner wall of the second valve body forms the inner wall of the assembly cavity, and the first opening penetrates the side wall of the first valve body and the second valve body; wherein the outer wall of the valve core assembly is formed with a first step, the inner wall of the second valve body is formed with a second step, and with the second valve body being screwed into the first valve body, the second step can be axially stopped at the first step to limit the axial movement of the valve core assembly.

[0013] In one of the embodiments, the stop valve further comprises a bearing, and the two ends of the bearing in the axial direction abut against the first step and the second step, respectively.

[0014] In one of the embodiments, a bottom wall of the assembly cavity is recessed in an axial direction towards the second opening to form a first sealing groove, the stop valve further comprises a first sealing member installed in the first sealing groove to seal and connect the first valve body and the second valve body; and / or, an outer periphery of the valve core assembly is recessed in a direction towards the axis to form a third sealing groove, the stop valve further comprises a third sealing member installed in the third sealing groove to seal and connect the valve core assembly and the second valve body.

[0015] In one of the embodiments, the first valve body and the second valve body enclose a second sealing groove at an end away from the second opening; the stop valve further comprises a second sealing member installed in the second sealing groove to seal and connect the first valve body and the second valve body.

[0016] In one of the embodiments, the stop valve further comprises a driving member, an output end of the driving member is connected to the valve core assembly to drive the valve core assembly to rotate.

[0017] Compared with the related art, the stop valve provided in the application, by arranging a ceramic segment on the valve core assembly, since the ceramic has the characteristics of high hardness, wear resistance and smooth surface, when the ceramic segment is rotationally matched with the valve body assembly, the valve core assembly can maintain good sealing with the valve body assembly, and the probability of jamming can be reduced. When the valve core assembly is rotated to the first flow-through opening in communication with the first opening, the stop valve is opened, and the refrigerant flowing through the stop valve can flow smoothly, and when the valve core assembly is rotated to the first flow-through opening offset from the second opening, the stop valve is closed, thereby achieving the cutting off of the refrigerant. In this way, the valve core assembly only needs to rotate a small angle to realize the on-off of the stop valve, the overall operation is simple, the response speed of the stop valve can be effectively improved, thereby achieving rapid cutting off when the refrigerant leaks, and the safety of the air conditioning unit is greatly improved. In addition, the valve core assembly cancels the traditional threaded structure, which can avoid defects such as thread slipping during use of the threaded structure, and further improves the service life of the stop valve.

[0018] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or in the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort based on these accompanying drawings.

[0020] Fig. 1 is a schematic diagram of a partial structure of a stop valve according to an embodiment of the present application.

[0021] Fig. 2 is a sectional view of the stop valve according to the first embodiment of the present application in an open state.

[0022] Fig. 3 is a sectional view of the stop valve according to the first embodiment of the present application in a closed state.

[0023] Fig. 4 is a sectional view of a stop valve according to a second embodiment of the present application in an open state.

[0024] Fig. 5 is a sectional view of the stop valve according to the second embodiment of the present application in a closed state.

[0025] Fig. 6 is a schematic diagram of a driving member according to an embodiment of the present application.

[0026] In the drawings, the following symbols represent the following meanings: 100, stop valve; 10, valve body assembly; 101, assembly cavity; 102, first opening; 103, second opening; 104, first sealing groove; 105, second sealing groove; 11, first valve body; 12, second valve body; 121, second step; 20, valve core assembly; 201, first flow-through cavity; 202, first flow-through opening; 203, third sealing groove; 21, ceramic section; 22, valve stem portion; 23, flow-through portion; 24, first step; 30, support portion; 301, second flow-through cavity; 302, second flow-through opening; 40, bearing; 50, first sealing member; 60, second sealing member; 70, third sealing member; 80, driving member. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] It should be noted that when an assembly is referred to as being "fixed to" or "set on" another assembly, it can be directly on the other assembly or there can be a middle assembly. When an assembly is referred to as being "connected to" another assembly, it can be directly connected to the other assembly or there can be a middle assembly. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the specification of the present application are for the purpose of illustration only, and do not indicate the only implementation.

[0029] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, features referring to "first", "second" etc. can include at least one of the features, explicitly or implicitly.

[0030] In the present application, unless specifically stated and limited otherwise, the terms "on", "under", "above" and "below" used in the present application are intended to encompass both direct and indirect contact among the features. In addition, the terms "on", "above" and "over" can mean directly above or obliquely above, or simply mean that the first feature is higher than the second feature in horizontal height. The terms "under", "below" and "underneath" can mean directly below or obliquely below, or simply mean that the first feature is lower than the second feature in horizontal height.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the specification of the present application, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] A stop valve is usually installed in an air conditioning unit, which usually includes a valve body and a valve core, the valve body is provided with a valve port, and the valve core is movably arranged in the valve body to open or close the valve port, so as to realize the on-off of the air conditioning pipeline.

[0033] In the related art, the valve core and the valve body are threadedly connected, that is, the valve core needs to be rotated to move towards the valve port to achieve closing. However, the valve core often needs to be rotated for thousands of degrees during the closing process, resulting in a slow closing speed of the valve core and the need to apply a large torque to achieve a hard seal with the valve port. In addition, the threaded connection structure is also prone to thread slipping, thereby affecting the service life of the stop valve.

[0034] Please refer to FIG. 1-5, to solve the problem of slow response and short service life of the valve body and the valve core threaded cooperation in the existing stop valve, the present application provides a stop valve 100. The stop valve 100 comprises a valve body assembly 10 and a valve core assembly 20, the valve body assembly 10 is provided with an assembly cavity 101, a first opening 102 and a second opening 103 which are communicated with the assembly cavity 101, and the first opening 102 is provided on the circumferential side of the valve body assembly 10. The valve core assembly 20 is at least partially installed in the assembly cavity 101, and the valve core assembly 20 can be rotationally matched with the inner wall of the assembly cavity 101 along the circumference of the assembly cavity 101, and the valve core assembly 20 is provided with a ceramic section 21, the ceramic section 21 is provided with a first flow-through cavity 201 and a first flow-through opening 202 which are communicated with each other, the first flow-through opening 202 is provided on the circumferential side of the ceramic section 21, and the first flow-through cavity 201 is communicated with the second opening 103. Wherein, with the rotation of the valve core assembly 20, the first flow-through opening 202 can be communicated with the first opening 102, or the first flow-through opening 202 can be disposed in dislocation with the first opening 102, so that the outer side wall of the ceramic section 21 can be blocked in the first opening 102 to disconnect the communication between the first flow-through opening 202 and the first opening 102.

[0035] It can be understood that, by providing the ceramic section 21 on the valve core assembly 20, due to the characteristics of high hardness, wear resistance and smooth surface of ceramic, when the ceramic section 21 is rotationally matched with the valve body assembly 10, the valve core assembly 20 can keep good sealing with the valve body assembly 10, and the probability of jamming can be reduced. When the valve core assembly 20 is rotated to the position that the first flow-through opening 202 is communicated with the first opening 102, the stop valve 100 is opened, and the refrigerant flowing through the stop valve 100 can flow smoothly, and when the valve core assembly 20 is rotated to the position that the first flow-through opening 202 is offset from the second opening 103, the stop valve 100 is closed, thereby realizing the cutting off of the refrigerant. In this way, the valve core assembly 20 only needs to rotate a small angle to realize the on-off of the stop valve 100, the whole operation is simple, the response speed of the stop valve 100 can be effectively improved, thereby realizing quick cutting off when the refrigerant leaks, and the safety of the air conditioning unit is greatly improved. In addition, the valve core assembly 20 cancels the traditional threaded cooperation structure, which can avoid the defects such as thread slipping during use, and further improves the service life of the stop valve 100.

[0036] In order to further improve the closing speed of the stop valve 100, in an embodiment, the stop valve 100 further comprises a driving member 80, the output end of the driving member 80 is connected with the valve core assembly 20 for driving the valve core assembly 20 to rotate. The driving member 80 can be electrically connected with the controller in the air conditioning system, so that when the controller detects the refrigerant leakage, the leakage signal is transmitted to the driving member, and the valve core assembly 20 is driven to rotate by the driving member 80 to close the stop valve 100, and the closing process is more reliable.

[0037] In an embodiment, as shown in FIG. 2 and FIG. 3, the valve core assembly 20 can be provided as an integrated structure, i.e., the valve core structure is integrally formed by ceramic. Of course, the valve core assembly 20 can also be made of other materials, and here, the roughness between the valve core assembly 20 and the valve body assembly 10 can be controlled to be less than 0.1 um, and at the same time, the gap between the two can be ensured to be less than 0.005 mm, so as to improve the reliability of the sealing fit between the two.

[0038] In order to reduce the processing difficulty of the valve core structure, in another embodiment, as shown in FIG. 4 and FIG. 5, the valve core assembly 20 can include a valve stem part 22 and a flow-through part 23 provided separately, one end of the valve stem part 22 is connected to the flow-through part 23 and is in circumferential rotation-stopping fit with the flow-through part 23. Among them, the flow-through part 23 forms the ceramic section 21. In this way, the valve stem part 22 and the flow-through part 23 can be made of different materials, and the machining precision of the flow-through part 23 can be easily controlled, further improving the reliability of the fit.

[0039] Among them, the valve stem part 22 can be made of brass or other materials, which can be reasonably set according to actual needs.

[0040] In an embodiment, as shown in FIG. 2 and FIG. 3, the flow-through area of the first flow-through cavity 201 along the axial direction is equal everywhere. That is, the first flow-through cavity 201 is a straight hole, which is simple in structure and easy to process.

[0041] In another embodiment, as shown in FIG. 4 and FIG. 5, the first flow-through cavity 201 is provided in a tapered manner, along the axial direction of the valve core assembly 20, and from the flow-through part 23 to the valve stem part 22, the flow-through cross-sectional area of the first flow-through cavity 201 gradually decreases. It can be understood that when the refrigerant flows from the first opening 102 to the second opening 103, the flow-through area of the first flow-through cavity 201 gradually increases, at this time, the speed of the refrigerant will decrease, thereby effectively reducing the probability of occurrence of vortex or turbulent flow, the refrigerant can maintain a laminar flow state, reduce energy loss, and effectively ensure the flow efficiency. When the refrigerant flows from the second opening 103 to the first opening 102, the flow-through area of the first flow-through cavity 201 gradually decreases, and if the refrigerant flow rate remains unchanged, the refrigerant will be compressed more at the flow rear end, and the pressure of the refrigerant will increase, thereby pushing the refrigerant to flow quickly to the first opening 102 through the first flow-through opening 202, improving the flow efficiency.

[0042] Further, in an embodiment, as shown in FIG. 3, when the first flow-through cavity 201 is provided in a tapered manner, the taper angle of the first flow-through cavity 201 is defined as θ, and the degree of the taper angle θ of the first flow-through cavity 201 satisfies 30°≤θ<180°. In this way, it is beneficial to further improve the flow guiding effect of the first flow-through cavity 201 on the refrigerant.

[0043] Optionally, the taper angle of the first flow cavity 201 can be set to 30°, 60°, 90°, 120°, 150°, 179°, or the like, which are not listed one by one herein.

[0044] Further, in an embodiment, the angle between the axis of the first opening 102 and the axis of the first flow port 202 is defined as β, and the angle β between the axis of the first opening 102 and the axis of the first flow port 202 satisfies 90° < β ≤ 180°. In this way, the flow guiding effect can be further improved, and when the refrigerant flows into the first flow cavity 201 through the first flow port 202, the refrigerant can quickly flow into the area with a larger cross-sectional area in the first flow cavity 201, thereby slowing down the flow rate of the refrigerant.

[0045] Optionally, the angle between the axis of the first opening 102 and the axis of the first flow port 202 can be set to 91°, 100°, 120°, 140°, 160°, or 180°, or the like, which are not listed one by one herein.

[0046] In an embodiment, as shown in FIGS. 3 and 4, the stop valve 100 further comprises a support portion 30, one end of the support portion 30 is fixedly connected to the bottom wall of the assembly cavity 101, and the other end extends into the first flow cavity 201 and abuts against the inner wall of the first flow cavity 201. The support portion 30 can improve the sealing effect between the support portion 30 and the inner wall of the first flow cavity 201, and can reduce the processing difficulty of the valve core assembly 20.

[0047] The support portion 30 is provided with a second flow cavity 301 and a second flow port 302 that are in communication with each other, the second flow cavity 301 has the same shape as the first flow cavity 201, and the second flow cavity 301 is in communication with the second opening 103. With the rotation of the valve core assembly 20, the second flow port 302 can be coaxially arranged with the first flow port 202 and communicate the first opening 102 through the first flow port 202, or the second flow port 302 can be arranged in a staggered manner with the first flow port 202, so that the outer side wall of the ceramic section 21 can block the second flow port 302 to disconnect the communication between the second flow port 302 and the first flow port 202. That is, the refrigerant can flow through the channel in the support portion 30.

[0048] Further, the support portion 30 is preferably made of ceramic material, so that the support portion 30 cooperates with the ceramic section 21 of the valve core assembly 20 more smoothly, thereby further improving the response speed.

[0049] In an embodiment, the valve body assembly 10 comprises a first valve body 11 and a second valve body 12, the second valve body 12 is mounted in the first valve body 11 and is threadedly connected with the first valve body 11, the inner wall of the first valve body 11 forms the bottom wall of the assembly cavity 101, the inner wall of the second valve body 12 forms the inner wall of the assembly cavity 101, and the first opening 102 penetrates the side wall of the first valve body 11 and the second valve body 12. Wherein, the outer wall of the valve core assembly 20 is formed with a first step 24, the inner wall of the second valve body 12 is formed with a second step 121, and the second step 121 can be axially stopped on the first step 24 when the second valve body 12 is screwed into the first valve body 11, so as to limit the axial movement of the valve core assembly 20.

[0050] In this way, the installation of the valve core assembly 20 is facilitated, and the installation efficiency of the valve core assembly 20 can be improved. Moreover, the axial both ends of the valve core assembly 20 can be limited, thereby further improving the reliability of the valve core assembly 20 when rotating, avoiding the axial movement of the valve core assembly 20, and causing the misalignment of the flow passage.

[0051] Further, in an embodiment, the stop valve 100 further comprises a bearing 40, and the axial both ends of the bearing 40 are respectively in abutment with the first step 24 and the second step 121. In this way, the rotation between the valve core assembly 20 and the valve body assembly 10 is facilitated, the resistance during rotation is reduced, and the coaxiality of the valve core assembly 20 and the valve body assembly 10 can be improved, avoiding the shift of the axis.

[0052] Specifically, the bearing 40 can be configured as a thrust bearing 40, thereby better bearing the axial pressure.

[0053] In an embodiment, as shown in FIGS. 2-5, the bottom wall of the assembly cavity 101 is recessed in the direction of approaching the second opening 103 along the axial direction to form a first sealing groove 104. The stop valve 100 further comprises a first sealing member 50, and the first sealing member 50 is mounted in the first sealing groove 104 to seal the connection between the first valve body 11 and the second valve body 12. In this way, the sealing property of the connection between the first valve body 11 and the second valve body 12 can be improved.

[0054] Specifically, the first sealing member 50 can be configured as a sealing ring or a sealing gasket. In addition, the valve core assembly 20 or the support portion 30 can also partially abut the first sealing member 50, so as to further improve the sealing property of the fit.

[0055] To improve the sealing performance of the first valve body 11 and the second valve body 12 at the other end along the axial direction, in an embodiment, the first valve body 11 and the second valve body 12 are provided with a second sealing groove 105 at the end away from the second opening 103, and the stop valve 100 further comprises a second sealing member 60 installed in the second sealing groove 105 to seal the connection between the first valve body 11 and the second valve body 12. Preferably, the second sealing groove 105 is arranged at the upper end of the threaded connection between the first valve body 11 and the second valve body 12.

[0056] In an embodiment, the outer periphery of the valve core assembly 20 is recessed towards the direction close to the axis to form a third sealing groove 203, and the stop valve 100 further comprises a third sealing member 70 installed in the third sealing groove 203 to seal the connection between the valve core assembly 20 and the second valve body 12. In this way, the sealing performance between the valve core assembly 20 and the valve body assembly 10 can be improved.

[0057] Further, the third sealing groove 203 is arranged on the outer periphery of the valve rod portion 22 of the valve core assembly 20, and multiple third sealing grooves 203 can be arranged along the axial direction to further improve the sealing performance.

[0058] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present disclosure.

[0059] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A stop valve characterized by comprising: The valve body assembly is provided with an assembly cavity, a first opening and a second opening, and the first opening is arranged on the circumferential side of the valve body assembly; The valve core assembly is at least partially installed in the assembly cavity, and the valve core assembly can be rotationally matched with the inner wall of the assembly cavity along the circumference of the assembly cavity, and the valve core assembly is provided with a ceramic section, the ceramic section is provided with a first flow cavity and a first flow opening which are in communication with each other, the first flow opening is arranged on the circumferential side of the ceramic section, and the first flow cavity is in communication with the second opening; Wherein, with the rotation of the valve core assembly, the first flow opening can be in communication with the first opening, or the first flow opening can be misaligned with the first opening so that the outer side wall of the ceramic section can be blocked in the first opening to disconnect the communication between the first flow opening and the first opening.

2. The stop valve according to claim 1, wherein The valve core assembly includes a valve rod part and a flow part, one end of the valve rod part is connected to the flow part, and the valve rod part is rotationally matched with the flow part along the circumference; Wherein, the flow part forms the ceramic section.

3. The stop valve according to claim 2, wherein The first flow cavity is arranged in a tapered manner along the axial direction of the valve core assembly, and the flow cross-sectional area of the first flow cavity gradually decreases from the flow part to the valve rod part; Wherein, the taper angle of the first flow cavity is defined as θ, and the taper angle θ of the first flow cavity satisfies 30°≤θ<180°.

4. The shut-off valve according to claim 3, wherein The included angle between the axis of the first opening and the axis of the first flow opening is defined as β, and the included angle β between the axis of the first opening and the axis of the first flow opening satisfies 90°<β≤180°.

5. The shut-off valve according to claim 3, wherein, The stop valve further comprises a support part, one end of the support part is fixedly connected to the bottom wall of the assembly cavity, the other end extends into the first flow cavity and abuts against the inner wall of the first flow cavity; Wherein, the support part is provided with a second flow cavity and a second flow opening which are in communication with each other, the second flow cavity is the same as the first flow cavity in shape, and the second flow cavity is in communication with the second opening, with the rotation of the valve core assembly, the second flow opening can be coaxially arranged with the first flow opening and communicate with the first opening through the first flow opening, or the second flow opening can be misaligned with the first flow opening, so that the outer side wall of the ceramic section can be blocked in the second flow opening to disconnect the communication between the second flow opening and the first flow opening.

6. The stop valve according to any one of claims 1 to 5, wherein The valve body assembly includes a first valve body and a second valve body, the second valve body is installed in the first valve body and is threadedly connected with the first valve body, the inner wall of the first valve body forms the bottom wall of the assembly cavity, the inner wall of the second valve body forms the inner wall of the assembly cavity, and the first opening penetrates the side wall of the first valve body and the second valve body; Wherein, the outer wall of the valve core assembly is formed with a first step, the inner wall of the second valve body is formed with a second step, and with the second valve body screwed into the first valve body, the second step can be axially stopped at the first step to limit the movement of the valve core assembly along the axial direction.

7. The shut-off valve according to claim 6, wherein The stop valve further comprises a bearing abutting against the first step and the second step respectively at two axial ends.

8. The shut-off valve according to claim 6, wherein, The bottom wall of the assembly cavity is concave in the direction of approaching the second opening to form a first sealing groove; The stop valve further comprises a first sealing member installed in the first sealing groove to seal and connect the first valve body and the second valve body.

9. The shut-off valve according to claim 6, wherein, The first valve body and the second valve body enclose a second sealing groove at one end away from the second opening, and the stop valve further comprises a second sealing member installed in the second sealing groove to seal and connect the first valve body and the second valve body.

10. The shut-off valve according to claim 6, wherein it is characterized by The outer periphery of the valve core assembly is concave in the direction of approaching the axis to form a third sealing groove, and the stop valve further comprises a third sealing member installed in the third sealing groove to seal and connect the valve core assembly and the second valve body.

11. The shut-off valve of claim 1, wherein, The stop valve further comprises a driving member, and an output end of the driving member is connected to the valve core assembly to drive the valve core assembly to rotate.

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