shutoff valve

Abstract

The application relates to the technical field of valves, in particular to a stop valve. The stop valve comprises a valve body assembly, a moving valve core, a static valve core and a limiting piece, a valve cavity is formed in the valve body assembly, the static valve core, the moving valve core and the limiting piece are sequentially arranged along the axial direction of the valve cavity, and the static valve core is in abutment with the valve body assembly and is axially limited. The limiting piece is fixedly connected with the valve body assembly, the limiting piece can apply force to the moving valve core along the axial direction of the valve cavity, the limiting piece and the valve body assembly clamp the static valve core and the moving valve core, and the force points of the limiting piece acting on the moving valve core are continuously or uniformly spaced along the circumferential direction of the valve cavity. The stop valve provided by the application solves the problem that the moving valve core is easily inclined under external force in the prior art stop valve, so that a gap is formed between the moving valve core and the static valve core and leakage is caused.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a gate valve. Background Technology

[0002] Gate valves are widely used in air conditioning systems to cut off the refrigerant flow in case of leaks or during maintenance, thus ensuring the safety of the air conditioning system. A known gate valve includes a valve stem, a moving valve core, and a stationary valve core. The stationary valve core has a valve port. The valve stem is connected to the moving valve core, driving the moving valve core to rotate relative to the stationary valve core, thereby opening or closing the valve port.

[0003] In related technologies, the valve stem not only drives the moving valve core to rotate but also applies axial pressure to it. This pressure is further transmitted to the valve body of the gate valve via the stationary valve core, thus enabling the valve stem and valve body to clamp the stationary and moving valve cores and ensure a seal between them. However, currently, there is only one connection point in the middle of the moving valve core between the valve stem and the moving valve core. The stability of the axial pressure applied by the valve stem is insufficient, and the moving valve core is prone to skew under external forces, creating a gap between the moving and stationary valve cores and leading to media leakage. Utility Model Content

[0004] Therefore, it is necessary to provide a gate valve to solve the problem that the moving valve core in the relevant gate valve is easily misaligned by external forces, which leads to the formation of a gap between the moving valve core and the stationary valve core and causes leakage.

[0005] This application provides a shut-off valve, which includes a valve body assembly, a moving valve core, a stationary valve core, and a limiting member. The valve body assembly has a valve cavity. The stationary valve core, the moving valve core, and the limiting member are arranged sequentially along the axial direction of the valve cavity, and the stationary valve core abuts against the valve body assembly and is axially limited. The limiting member is fixedly connected to the valve body assembly, and the limiting member can apply force to the moving valve core along the axial direction of the valve cavity, and cooperates with the valve body assembly to clamp the stationary valve core and the moving valve core. Furthermore, the points where the limiting member acts on the moving valve core are continuously or evenly spaced along the circumference of the valve cavity.

[0006] In one embodiment, the shut-off valve further includes a thrust bearing, which is disposed between the limiting member and the moving valve core along the axial direction of the valve cavity, and the two ends of the thrust bearing respectively abut against the limiting member and the moving valve core.

[0007] In one embodiment, the end of the limiting member near the moving valve core is recessed to form a mounting groove, and at least part of the thrust bearing is installed in the mounting groove; wherein, the sidewall of the mounting groove contacts and rotates with the thrust bearing.

[0008] In one embodiment, the shut-off valve further includes a first connecting pipe, which is connected to the side wall of the valve body assembly and communicates with the valve cavity; wherein, the limiting member has a flow groove, which is positioned opposite the first connecting pipe.

[0009] In one embodiment, the shut-off valve further includes a valve stem that passes through the limiting member and the thrust bearing, and one end of the valve stem is connected to the moving valve core so that the valve stem can drive the moving valve core to rotate around the axis of the valve cavity; wherein, there is a gap between the outer wall of the valve stem and the inner wall of the thrust bearing.

[0010] In one embodiment, the shut-off valve further includes a valve stem that passes through the limiting member, and one end of the valve stem is connected to the moving valve core so that the valve stem can drive the moving valve core to rotate around the axis of the valve cavity; wherein, there is a gap between the outer wall of the valve stem and the inner wall of the limiting member.

[0011] In one embodiment, the limiting member and the valve body assembly are welded together.

[0012] In one embodiment, the outer periphery of the limiting member away from the moving valve core protrudes to form a connecting portion, and the outer peripheral wall of the connecting portion contacts and is welded to the inner wall of the valve cavity.

[0013] In one embodiment, the valve body assembly includes a valve tube and a valve seat, the valve seat being mounted on the end of the valve tube away from the limiting member; wherein, the end of the valve seat near the limiting member has a recessed mounting groove, the stationary valve core being mounted in the mounting groove and engaging with the valve seat to prevent rotation.

[0014] In one embodiment, a sealing groove is provided between the valve seat and the stationary valve core. The shut-off valve also includes a sealing element, which is installed in the sealing groove and seals against the valve seat and the stationary valve core respectively.

[0015] Compared with existing technologies, the gate valve provided in this application, by setting a limiting member, can confine the moving valve core between the limiting member and the stationary valve core after the limiting member is fixedly connected to the valve body assembly. Furthermore, because the force application points of the limiting member on the moving valve core are continuously or evenly spaced along the circumference of the valve cavity, the force application effect of the limiting member is more stable. When the moving valve core is subjected to external force and tends to shift, the limiting member can withstand the force of the moving valve core, thereby preventing axial movement of the moving valve core and ensuring that the moving valve core can only rotate. Therefore, even if the moving valve core is subjected to external force, the limiting effect of the limiting member ensures that the moving valve core always maintains a tight fit with the stationary valve core, preventing displacement and internal leakage, thus effectively improving the safety of the gate valve during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a shut-off valve according to an embodiment of this application;

[0018] Figure 2 An exploded view of a shut-off valve according to an embodiment provided in this application;

[0019] Figure 3 A cross-sectional view of a shut-off valve according to an embodiment of this application.

[0020] The symbols in the diagram represent the following meanings:

[0021] 100. Gate valve; 10. Valve body assembly; 101. Valve cavity; 102. Sealing groove; 11. Valve pipe; 12. Valve seat; 13. Seal; 20. Moving valve core; 30. Stationary valve core; 301. Valve port; 40. Limiting element; 401. Mounting groove; 402. Flow groove; 41. Connecting part; 50. Thrust bearing; 60. Valve stem; 70. First connecting pipe; 80. Second connecting pipe. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in this 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 this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0027] Gate valves are widely used in air conditioning systems to cut off the refrigerant flow in case of leaks or during maintenance, thus ensuring the safety of the air conditioning system. A gate valve typically consists of a valve stem, a moving valve core, and a stationary valve core. The stationary valve core has a valve port. The valve stem is connected to the moving valve core, driving the moving valve core to rotate relative to the stationary valve core, thereby opening or closing the valve port.

[0028] In related technologies, the valve stem not only drives the moving valve core to rotate but also applies axial pressure to it. This pressure is further transmitted to the valve body of the gate valve via the stationary valve core, thus enabling the valve stem and valve body to clamp the stationary and moving valve cores and ensure a seal between them. However, currently, there is only one connection point in the middle of the moving valve core between the valve stem and the moving valve core. The stability of the axial pressure applied by the valve stem is insufficient, and the moving valve core is prone to skew under external forces, creating a gap between the moving and stationary valve cores and leading to media leakage.

[0029] Please see Figures 1-3 To address the problem that the moving valve core in related stop valves is easily misaligned by external forces, leading to gaps and leakage between the moving and stationary valve cores, this application provides a stop valve 100. The stop valve 100 includes a valve body assembly 10, a moving valve core 20, a stationary valve core 30, and a limiting member 40. The valve body assembly 10 has a valve cavity 101. The stationary valve core 30, the moving valve core 20, and the limiting member 40 are sequentially arranged along the axial direction of the valve cavity 101, with the stationary valve core 30 abutting against and axially limiting the valve body assembly 10. The limiting member 40 is fixedly connected to the valve body assembly 10 and can apply force to the moving valve core 20 along the axial direction of the valve cavity 101, clamping the stationary valve core 30 and the moving valve core 20 in cooperation with the valve body assembly 10. Furthermore, the points of force application of the limiting member 40 to the moving valve core 20 are continuously or evenly spaced along the circumference of the valve cavity 101.

[0030] Understandably, by setting a limiting member 40, after the limiting member 40 is fixedly connected to the valve body assembly 10, the moving valve core 20 can be limited between the limiting member 40 and the stationary valve core 30. Since the force application point of the limiting member 40 on the moving valve core 20 is continuously or evenly spaced along the circumference of the valve cavity 101, the force application effect of the limiting member 40 is more stable. When the moving valve core 20 is subjected to external force and tends to shift, the limiting member 40 can withstand the force of the moving valve core 20, thereby preventing the moving valve core 20 from moving axially and ensuring that the moving valve core 20 can only rotate. Therefore, even if the moving valve core 20 is subjected to external force, due to the limiting effect of the limiting member 40, the moving valve core 20 can always maintain a tight fit with the stationary valve core 30, preventing them from shifting and causing internal leakage, thereby effectively improving the safety of the shut-off valve 100 during use.

[0031] Specifically, such as Figure 1As shown, the shut-off valve 100 also includes a valve stem 60, a first connecting pipe 70, and a second connecting pipe 80. One end of the valve stem 60 is connected to the moving valve core 20, enabling the valve stem 60 to drive the moving valve core 20 to rotate around the axis of the valve cavity 101. The first connecting pipe 70 is connected to the side wall of the valve body assembly 10 and communicates with the valve cavity 101. The second connecting pipe 80 is connected to one end of the valve body assembly 10 and communicates with the valve cavity 101. Thus, the moving valve core 20 can rotate around its axis via the valve stem 60, allowing the moving valve core 20 to open or close the valve port 301 on the stationary valve core 30. It is easy to understand that when the moving valve core 20 opens the valve port 301 on the stationary valve core 30, the first connecting pipe 70 and the second connecting pipe 80 are connected through the valve cavity 101 and the valve port 301; conversely, when the moving valve core 20 closes the valve port 301 on the stationary valve core 30, the connection between the first connecting pipe 70 and the second connecting pipe 80 is severed.

[0032] In one embodiment, such as Figure 2 and Figure 3 As shown, the shut-off valve 100 also includes a thrust bearing 50. Along the axial direction of the valve cavity 101, the thrust bearing 50 is disposed between the limiting member 40 and the moving valve core 20, and both ends of the thrust bearing 50 abut against the limiting member 40 and the moving valve core 20, respectively. The thrust bearing 50 is used to bear axial force. At the same time, by setting the thrust bearing 50, direct contact between the limiting member 40 and the moving valve core 20 can be avoided. This not only changes the sliding friction between the limiting member 40 and the moving valve core 20 into rolling friction, reducing wear caused by friction and lowering the valve opening torque, but also increases the contact area of ​​the moving valve core 20, ensuring that the force on the moving valve core 20 can be evenly distributed on the thrust bearing 50, effectively reducing the risk of the moving valve core 20 being crushed.

[0033] Typically, to reduce the frictional resistance between the moving valve core 20 and the stationary valve core 30, both the moving valve core 20 and the stationary valve core 30 can be made of ceramic.

[0034] Furthermore, in one embodiment, as Figure 3 As shown, the limiting member 40 has a recessed mounting groove 401 at one end near the moving valve core 20, and at least part of the thrust bearing 50 is installed in the mounting groove 401. The sidewall of the mounting groove 401 contacts and rotatably engages with the thrust bearing 50. Thus, the mounting groove 401 limits the installation of the thrust bearing 50, preventing it from shifting in a direction perpendicular to the axis of the valve cavity 101, effectively improving the reliability of the thrust bearing 50's installation.

[0035] Furthermore, in one embodiment, the limiting member 40 is provided with a flow groove 402, which is positioned directly opposite the first connecting pipe 70, in order to reduce the obstruction of the fluid medium by the limiting member 40, thereby improving the flow effect of the fluid medium.

[0036] Specifically, the mounting groove 401 is located on the side wall of the flow groove 402 and is connected to the flow groove 402.

[0037] In one embodiment, such as Figure 3 As shown, the valve stem 60 passes through the limiting member 40 and the thrust bearing 50, and there is a gap between the outer wall of the valve stem 60 and the inner wall of the limiting member 40, and a gap between the outer wall of the valve stem 60 and the inner wall of the thrust bearing 50.

[0038] Understandably, by setting a gap between the valve stem 60 and the limiting member 40, the rotation of the valve stem 60 can prevent it from affecting the limiting member 40, thereby ensuring the reliability of the connection between the limiting member 40 and the valve body assembly 10, and further ensuring the reliability of the limiting member 40 in axially limiting the thrust bearing 50 and the moving valve core 20. Furthermore, setting a gap between the valve stem 60 and the thrust bearing 50 can further increase the flowable area of ​​the fluid, thereby improving the fluid's flow performance.

[0039] In summary, the axial force on the moving valve core 20 of this application can be transmitted to the limiting member 40 by the thrust bearing 50, while the valve stem 60 only applies a circumferential rotational torque to the moving valve core 20. Even if the valve stem 60 is tilted, the force transmitted to the moving valve core 20 due to the tilt will not cause the moving valve core 20 to shift axially, effectively preventing internal leakage.

[0040] In one embodiment, the limiting member 40 and the valve body assembly 10 are welded together to improve the strength of the connection between the limiting member 40 and the valve body assembly 10, so that the limiting member 40 can better withstand the axial force transmitted by the moving valve core 20 and the thrust bearing 50.

[0041] Furthermore, in one embodiment, a connecting portion 41 protrudes from the outer periphery of the end of the limiting member 40 away from the moving valve core 20. The outer peripheral wall of the connecting portion 41 contacts and is welded to the inner wall of the valve cavity 101. That is, the outer diameter of the end of the limiting member 40 near the moving valve core 20 is smaller than the outer diameter of the end of the limiting member 40 away from the moving valve core 20, thereby facilitating the insertion of the limiting member 40 into the valve cavity 101 and reducing the difficulty of connecting the limiting member 40 and the valve body assembly 10.

[0042] To facilitate the welding of the limiting member 40 and the valve body assembly 10, both the limiting member 40 and the valve body assembly 10 can be made of metal. For example, the part of the valve body assembly 10 and the limiting member 40 that is welded together can be made of stainless steel.

[0043] In one embodiment, such as Figure 1 As shown, the valve body assembly 10 includes a valve tube 11 and a valve seat 12, with the valve seat 12 mounted on the end of the valve tube 11 away from the limiting member 40. A mounting groove is recessed at the end of the valve seat 12 near the limiting member 40, and the stationary valve core 30 is mounted in the mounting groove, engaging with the valve seat 12 in a non-rotating manner. This improves the reliability of the stationary valve core 30 installation.

[0044] Specifically, one of the outer wall of the stationary valve core 30 and the inner wall of the assembly groove is provided with a protrusion, and the other is provided with a groove. The circumferential rotation of the stationary valve core 30 is restricted by the cooperation between the protrusion and the groove.

[0045] Furthermore, such as Figure 1 As shown, a sealing groove 102 is provided between the valve seat 12 and the stationary valve core 30. The gate valve 100 also includes a sealing element 13, which is installed in the sealing groove 102 and abuts against both the valve seat 12 and the stationary valve core 30. Thus, the sealing element 13 seals the gap between the valve seat 12 and the stationary valve core 30, preventing leakage of the medium and further improving the safety of the gate valve 100 when closed.

[0046] Specifically, the sealing groove 102 can be formed in the recess of the bottom wall of the assembly groove to facilitate processing.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A shut-off valve, characterized in that, The valve body assembly includes a valve body assembly (10), a moving valve core (20), a stationary valve core (30), and a limiting member (40). The valve body assembly (10) has a valve cavity (101). The stationary valve core (30), the moving valve core (20), and the limiting member (40) are arranged sequentially along the axial direction of the valve cavity (101). The stationary valve core (30) abuts against the valve body assembly (10) and is axially limited. The limiting member (40) is fixedly connected to the valve body assembly (10), and the limiting member (40) can apply force to the moving valve core (20) along the axial direction of the valve cavity (101), and cooperate with the valve body assembly (10) to clamp the stationary valve core (30) and the moving valve core (20). Furthermore, the points where the limiting member (40) applies force to the moving valve core (20) are continuously or evenly spaced along the circumference of the valve cavity (101).

2. The shut-off valve according to claim 1, characterized in that, The shut-off valve also includes a thrust bearing (50), which is located between the limiting member (40) and the moving valve core (20) along the axial direction of the valve cavity (101), and the two ends of the thrust bearing (50) respectively abut against the limiting member (40) and the moving valve core (20).

3. The shut-off valve according to claim 2, characterized in that, The limiting member (40) has a recessed mounting groove (401) at one end near the moving valve core (20), and at least part of the thrust bearing (50) is installed in the mounting groove (401); The sidewall of the mounting groove (401) contacts and rotates with the thrust bearing (50).

4. The shut-off valve according to claim 2, characterized in that, The shut-off valve further includes a first connecting pipe (70), which is connected to the side wall of the valve body assembly (10) and communicates with the valve cavity (101); The limiting member (40) is provided with a flow groove (402), which is positioned opposite the first connecting pipe (70).

5. The shut-off valve according to claim 2, characterized in that, The shut-off valve also includes a valve stem (60), which passes through the limiting member (40) and the thrust bearing (50), and one end of the valve stem (60) is connected to the moving valve core (20) so that the valve stem (60) can drive the moving valve core (20) to rotate around the axis of the valve cavity (101); There is a gap between the outer wall of the valve stem (60) and the inner wall of the thrust bearing (50).

6. The shut-off valve according to claim 1, characterized in that, The shut-off valve also includes a valve stem (60), which passes through the limiting member (40), and one end of the valve stem (60) is connected to the moving valve core (20) so that the valve stem (60) can drive the moving valve core (20) to rotate around the axis of the valve cavity (101). There is a gap between the outer wall of the valve stem (60) and the inner wall of the limiting member (40).

7. The shut-off valve according to claim 1, characterized in that, The limiting member (40) and the valve body assembly (10) are welded and fixed.

8. The shut-off valve according to claim 7, characterized in that, The limiting member (40) has a connecting part (41) protruding from the outer periphery of the end away from the moving valve core (20). The outer periphery wall of the connecting part (41) contacts and is welded to the inner wall of the valve cavity (101).

9. The shut-off valve according to claim 1, characterized in that, The valve body assembly (10) includes a valve tube (11) and a valve seat (12), the valve seat (12) being mounted at the end of the valve tube (11) away from the limiting member (40); The valve seat (12) has a recessed mounting groove at one end near the limiting member (40), and the stationary valve core (30) is installed in the mounting groove and engages with the valve seat (12) to prevent rotation.

10. The shut-off valve according to claim 9, characterized in that, A sealing groove (102) is provided between the valve seat (12) and the stationary valve core (30). The shut-off valve also includes a sealing element (13), which is installed in the sealing groove (102) and seals against the valve seat (12) and the stationary valve core (30) respectively.

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