Valve element assembly and stop valve
By designing a balance hole on the moving valve core of the gate valve, the problem of difficult valve opening due to large pressure difference when the moving valve core is closed is solved, achieving efficient valve opening and stable flow control, and improving response speed and motor service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG DUNAN HETIAN METAL CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-28
AI Technical Summary
When the existing gate valve is closed, the large pressure difference between the two sides of the moving valve core along the axis makes it difficult to open the valve, increasing the difficulty of opening the valve.
Design a valve core assembly including a stationary valve core, a first valve core and a second valve core. The second valve core has a balance hole. The medium flow balance is achieved by the misaligned rotation of the first valve core and the balance hole, which reduces the pressure difference on both sides of the valve port and reduces the rotation torque requirement.
By reducing the pressure difference and initial operating resistance across the valve port, the valve opening efficiency and response speed are improved, the instantaneous torque impact on the motor is reduced, and the service life of the motor is extended.
Smart Images
Figure CN224174572U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of valve technology, and in particular to a valve core assembly and a gate valve. Background Technology
[0002] Gate valves are widely used in air conditioning systems to cut off the refrigerant passage in case of leaks or during maintenance, thereby ensuring the safety of the air conditioning system.
[0003] In related technologies, a gate valve contains a stationary valve core and a moving valve core stacked together. The stationary valve core has a valve port, and the moving valve core rotates via a valve stem to open or close the valve port. However, currently, when the moving valve core closes the valve port, it experiences a large fluid pressure difference on both sides along its axial direction. This results in a high torque requirement, increasing the difficulty of opening the gate valve. Utility Model Content
[0004] Therefore, it is necessary to provide a valve core assembly and a shut-off valve to solve the problem that the large pressure difference between the two sides of the moving valve core when the valve is closed makes it difficult to open the valve.
[0005] This application provides a valve core assembly, including a stationary valve core and a moving valve core. The stationary valve core has a valve port, and the moving valve core abuts against the stationary valve core and is rotatable relative to the stationary valve core. As the moving valve core rotates, it can open or close the valve port. The moving valve core includes a first valve core and a second valve core, which is sandwiched between the first valve core and the stationary valve core and is rotatably engaged with both. The second valve core has a through-hole with a flow area smaller than the flow area of the valve port. The valve core assembly has a fully closed state and a first transition state. When the valve core assembly is in the fully closed state, the second valve core covers the valve port, and one end of the balance hole communicates with the valve port. The first valve core blocks the end of the balance hole away from the valve port. When the valve core assembly is in the first transition state, the second valve core covers the valve port, one end of the balance hole communicates with the valve port, and the first valve core is misaligned with the balance hole.
[0006] In one embodiment, the valve core assembly also has a fully open state. When the valve core assembly is in the fully open state, the second valve core is misaligned with the valve port, the first valve core blocks the balance hole or is misaligned with the balance hole, and the stationary valve core blocks the balance hole at the end away from the first valve core.
[0007] In one embodiment, the valve core assembly further has a second transition state. When the valve core assembly is in the second transition state, the second valve core is misaligned with the valve port, and the first valve core and the stationary valve core are respectively sealed at both ends of the balance hole.
[0008] In one embodiment, a first limiting portion is formed on the surface of the second valve core near the first valve core; when the first valve core rotates in the valve opening direction, the first valve core avoids the balance hole and can contact the first limiting portion, so as to drive the second valve core to rotate synchronously, so that the second valve core can avoid the valve port.
[0009] In one embodiment, a second limiting portion is formed on the surface of the second valve core near the first valve core. The second limiting portion is spaced apart from the first limiting portion along the circumference of the second valve core. When the first valve core rotates in the valve closing direction, the first valve core covers the balance hole and can contact the second limiting portion to drive the second valve core to rotate synchronously so that the second valve core can cover the valve port.
[0010] In one embodiment, there are two first limiting parts, and when the first valve core rotates in the opening direction, the two first limiting parts can respectively abut against the two ends of the first valve core; and / or, there are two second limiting parts, and when the first valve core rotates in the closing direction, the two second limiting parts can respectively abut against the two ends of the first valve core.
[0011] In one embodiment, a drive groove is formed on the surface of the first valve core on the side away from the second valve core, the drive groove being used to connect with an external drive component.
[0012] In one embodiment, the outer wall of the stationary valve core protrudes outward to form an anti-rotation portion, which is used to cooperate with and connect with an external valve body assembly.
[0013] In one embodiment, the stationary valve core, the first valve core, and the second valve core are all configured as ceramic parts.
[0014] This application also provides a shut-off valve, which includes a valve body assembly, a drive assembly, and a valve core assembly as described in any of the above embodiments. The valve body assembly includes a main valve body, a valve seat, a mounting flange, a first connecting pipe, and a second connecting pipe. A valve cavity is formed within the main valve body. Along the axial direction of the valve cavity, the valve seat is mounted at one end of the valve cavity, and one end of the valve seat is connected to the valve core assembly, while the other end is connected to the first connecting pipe. The mounting flange is sleeved on the outer periphery of the main valve body and engages with the valve seat along the axial direction. The second connecting pipe is connected to the periphery of the main valve body. The drive assembly includes a valve stem, an elastic element, a fixing element, a first bearing, and a second bearing. The valve stem is rotatably disposed within the valve cavity. Inside, one end of the valve stem is connected to the moving valve core to drive the moving valve core to rotate, and a mounting portion is formed on the circumferential side of the valve stem; the fixing member is sleeved on the end of the valve stem away from the moving valve core, and the outer wall of the fixing member is fixedly connected to the inner wall of the valve cavity; the elastic member and the first bearing are installed between the mounting portion and the fixing member, and one end of the elastic member abuts against the mounting portion, and the other end applies force to the first bearing so that the first bearing abuts against the fixing member; the second bearing is located on the end of the fixing member away from the first bearing, and the outer ring of the second bearing is connected to the fixing member, and the inner ring of the second bearing is sleeved and connected to the valve stem.
[0015] Compared with existing technologies, the valve core assembly and shut-off valve provided in this application, by opening a balance hole on the second valve core, allows the first valve core to rotate to the side of the balance hole when the first valve core rotates to open the valve, achieving misalignment with the balance hole and thus opening the balance hole. At this time, refrigerant and other media can achieve flow balance through the balance hole, thereby reducing the pressure on both sides of the valve port, reducing the water hammer effect, and reducing the difficulty of the subsequent rotation of the second valve core to open the valve port, resulting in higher stability. Furthermore, the contact area between the first and second valve cores is smaller than the contact area between the second valve core and the stationary valve core, which reduces the initial operating resistance, thereby effectively reducing the torque requirement applied to the first valve core, improving the response speed, and thus greatly improving the valve port opening efficiency under the same power. 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 cross-sectional view of a shut-off valve according to an embodiment of this application;
[0018] Figure 2 An exploded view of the shut-off valve portion structure of an embodiment provided in this application;
[0019] Figure 3 A top view (fully closed state) of a valve core assembly according to an embodiment provided in this application.
[0020] Figure 4 A top view (first transition state) of a valve core assembly according to an embodiment provided in this application.
[0021] Figure 5 A top view (fully open state) of a valve core assembly according to an embodiment provided in this application.
[0022] Figure 6 A schematic diagram of the valve core assembly (second transition state) of an embodiment provided in this application.
[0023] The symbols in the diagram represent the following meanings:
[0024] 100. Gate valve; 10. Valve core assembly; 11. Stationary valve core; 111. Valve port; 112. Anti-rotation part; 12. Moving valve core; 121. First valve core; 1211. Drive groove; 122. Second valve core; 1221. Balance hole; 1222. First limiting part; 1223. Second limiting part; 20. Valve body assembly; 21. Main valve body; 211. Valve cavity; 22. Valve seat; 23. Mounting flange; 24. First connecting pipe; 25. Second connecting pipe; 30. Drive assembly; 31. Valve stem; 311. Mounting part; 32. Elastic element; 33. Fixing element; 34. First bearing; 35. Second bearing. Detailed Implementation
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] Gate valves are widely used in air conditioning systems to cut off the refrigerant passage in case of leaks or during maintenance, thereby ensuring the safety of the air conditioning system.
[0031] In related technologies, a gate valve contains a stationary valve core and a moving valve core stacked together. The stationary valve core has a valve port, and the moving valve core rotates via a valve stem to open or close the valve port. However, currently, when the moving valve core closes the valve port, it experiences a large fluid pressure difference on both sides along its axial direction. This results in a high torque requirement, increasing the difficulty of opening the gate valve.
[0032] Please see Figures 1-6This application provides a valve core assembly 10 and a shut-off valve 100. The shut-off valve 100 includes a valve body assembly 20, a drive assembly 30, and a valve core assembly 10. The valve core assembly 10 includes a stationary valve core 11 and a moving valve core 12. The stationary valve core 11 has a valve port 111. The moving valve core 12 abuts against the stationary valve core 11 and can rotate relative to the stationary valve core 11. As the moving valve core 12 rotates, the moving valve core 12 can open or close the valve port 111. The valve body assembly 20 includes a main valve body 21, a valve seat 22, a mounting flange 23, a first connecting pipe 24, and a second connecting pipe 25. The main valve body 21 has a valve cavity 211. Along the axial direction of the valve cavity 211, the valve seat 22 is mounted at one end of the valve cavity 211, with one end connected to the valve core assembly 10 and the other end connected to the first connecting pipe 24. The second connecting pipe 25 is connected to the periphery of the main valve body 21. Thus, when the valve core assembly 10 opens or closes the valve port 111, the flow path between the first connecting pipe 24 and the second connecting pipe 25 can be opened or closed accordingly. The mounting flange 23 is located at one end of the main valve body 21 and axially stops the valve seat 22. The mounting flange 23 can be welded to both the main valve body 21 and the valve seat 22 to ensure reliable connection.
[0033] Specifically, the stationary valve core 11 is limited and installed within the valve seat 22. To ensure the installation stability of the stationary valve core 11, in one embodiment, as follows... Figure 2 As shown, the outer wall of the stationary valve core 11 protrudes outward to form an anti-rotation part 112. The anti-rotation part 112 is used to connect with the external valve body assembly 20. It is easy to understand that the valve body assembly 20 can open a corresponding anti-rotation groove on the valve seat 22. The anti-rotation part 112 is inserted into the anti-rotation groove, thereby preventing the stationary valve core 11 from rotating in the circumferential direction. In this way, it is ensured that the stationary valve core 11 will not rotate relative to the valve seat 22.
[0034] To achieve the driving of the moving valve core 12, in one embodiment, such as Figure 2As shown, the drive assembly 30 includes a valve stem 31, an elastic element 32, a fixing element 33, a first bearing 34, and a second bearing 35. The valve stem 31 is rotatably disposed within the valve cavity 211, and one end of the valve stem 31 is connected to the moving valve core 12 for driving the moving valve core 12 to rotate. A mounting portion 311 protrudes from the periphery of the valve stem 31. The fixing element 33 is sleeved on the end of the valve stem 31 away from the moving valve core 12, and the outer wall of the fixing element 33 is fixedly connected to the inner wall of the valve cavity 211. The elastic element 32 and the first bearing 34 are installed between the mounting portion 311 and the fixing element 33, and one end of the elastic element 32 abuts against the mounting portion 311, while the other end applies force to the first bearing 34 so that the first bearing 34 abuts against the fixing element 33. The second bearing 35 is disposed on the end of the fixing element 33 away from the first bearing 34, and the outer ring of the second bearing 35 is connected to the fixing element 33. The inner ring of the second bearing 35 is sleeved and connected to the valve stem 31. Here, the first bearing 34 can be configured as a thrust bearing, which can better withstand axial forces and reduce rotational resistance. The second bearing 35 can be configured as a needle roller bearing, which can ensure the verticality of the valve stem 31 and reduce frictional resistance. Simultaneously, since the position of the fixing member 33 relative to the valve body is fixed, and the elastic force generated by the elastic member 32 can be applied to the fixing member 33 through the first bearing 34, the elastic member 32 can apply a force to the mounting portion 311 in the direction closer to the valve core assembly 10, enabling the valve stem 31 to provide stable sealing pressure to the moving valve core 12. Specifically, the elastic member 32 can be a disc-shaped spring, which makes the installation more stable.
[0035] Because the fluid pressure difference at both ends of the moving valve core 12 is relatively large when the valve port 111 is closed, the moving valve core 12 will press tightly against the stationary valve core 11 under the action of the fluid pressure difference, thereby increasing the difficulty of rotating the moving valve core 12. Based on this, in order to reduce the driving difficulty of rotating the moving valve core 12, in one embodiment, the moving valve core 12 includes a first valve core 121 and a second valve core 122. The second valve core 122 is sandwiched between the first valve core 121 and the stationary valve core 11, and can rotate and cooperate with the first valve core 121 and the stationary valve core 11 respectively. The second valve core 122 has a through-hole balance hole 1221, and the flow area of the balance hole 1221 is smaller than the flow area of the valve port 111. The valve core assembly 10 has a fully closed state and a first transition state. When the valve core assembly 10 is in the fully closed state, such as Figure 3 As shown, the second valve core 122 covers the valve port 111, and one end of the balance hole 1221 communicates with the valve port 111. The first valve core 121 blocks the end of the balance hole 1221 away from the valve port 111. When the valve core assembly 10 is in the first transition state, as... Figure 4 As shown, the second valve core 122 covers the valve port 111, one end of the balance hole 1221 is connected to the valve port 111, and the first valve core 121 and the balance hole 1221 are misaligned.
[0036] Understandably, this application utilizes a balance hole 1221 on the second valve core 122. When the first valve core 121 rotates to open the valve, it rotates to the side of the balance hole 1221, achieving misalignment and opening the balance hole 1221. At this time, refrigerant and other media can achieve flow balance through the balance hole 1221, thereby reducing the pressure on both sides of the valve port 111, reducing water hammer effect, and lowering the difficulty of the second valve core 122 rotating to open the valve port 111, resulting in higher stability. Furthermore, the contact area between the first valve core 121 and the second valve core 122 is smaller than the contact area between the second valve core 122 and the stationary valve core 11. This reduces initial operating resistance, effectively lowering the torque requirement applied to the first valve core 121, improving response speed, and significantly increasing the opening efficiency of the valve port 111 under the same power.
[0037] It should be noted that water hammer effect refers to the pressure shock wave generated by a sudden change in fluid velocity in a pipeline (such as a valve suddenly closing or opening). Its pressure peak can be several times or even tens of times the normal operating pressure, causing damage to the pipeline system. In this application, the small-diameter balancing hole 1221 can first balance the pressure on both sides of the valve core, avoiding sudden changes in flow velocity due to excessive pressure difference when the valve port 111 is opened later.
[0038] It should also be noted that in the traditional structure of the moving valve core 12 and the stationary valve core 11, when the moving valve core 12 closes the valve port 111, a pressure difference is formed between the high-pressure side (inlet) and the low-pressure side (outlet). Here, the pressure on the high-pressure side can be defined as... The pressure on the low-pressure side is Therefore, the pressure difference between the high-pressure side and the low-pressure side... The pressure difference will act on the effective area A of the moving valve core 12, thus generating an axial force. This force presses the moving valve core 12 tightly against the surface of the stationary valve core 11, increasing frictional resistance and making rotation difficult. The effective area here corresponds to the flow area of the fluid channel, which in a conventional structure corresponds to the flow area of the valve port 111, while in this application it corresponds to the flow area of the balance hole 1221. Since the flow area of the balance hole 1221 is smaller than that of the valve port 111, the axial force exerted on the first valve core 121 by the pressure difference between the high-pressure and low-pressure sides is smaller. This means the first valve core 121 is easier to move, allowing the balance hole 1221 to open first, achieving pressure balance at both ends of the valve port 111. This reduces the axial force formed by the pressure difference at both ends of the second valve core 122, facilitating the rotation of the second valve core 122 to open the valve port 111 and achieve valve opening. Specifically, the valve stem 31 is typically driven by a motor (not shown) to rotate, thereby driving the first valve core 121 to rotate. This application adopts a segmented opening method, which reduces the initial torque required by the motor, thereby reducing the instantaneous torque impact on the motor, avoiding motor overload damage, and thus improving the service life of the motor.
[0039] Furthermore, in one embodiment, when the first valve core 121 rotates to the first preset position in the valve opening direction, the first valve core 121 fully opens the balance hole 1221, and the first valve core 121 engages with the second valve core 122, thereby driving the second valve core 122 to rotate synchronously. In this way, the rotation control of the first valve core 121 and the second valve core 122 can be achieved solely through the rotation of the valve stem 31, completing the entire valve opening process, making operation simpler. When the first valve core 121 moves to the first preset position, this corresponds to the first transition state of the valve core assembly 10.
[0040] Specifically, a first limiting portion 1222 protrudes from the surface of the second valve core 122 near the first valve core 121. When the first valve core 121 rotates in the valve opening direction, it avoids the balance hole 1221 and contacts the first limiting portion 1222, thereby driving the second valve core 122 to rotate synchronously, so that the second valve core 122 can avoid the valve port 111. Thus, the method by which the first valve core 121 drives the second valve core 122 to rotate is relatively simple and easy to manufacture. For example, the first limiting portion 1222 can be configured as a strip-shaped or columnar protrusion, etc.
[0041] In other embodiments, when the first valve core 121 rotates to the first preset position in the valve opening direction, the first valve core 121 can also drive the second valve core 122 to rotate through magnetic cooperation or other means.
[0042] like Figure 5As shown, the valve core assembly 10 also has a fully open state. When the first valve core 121 continues to rotate in the valve opening direction at the first preset position, the first valve core 121 can drive the second valve core 122 to rotate synchronously. The second valve core 122 can gradually rotate and open the valve port 111, thereby increasing the flow at the valve port 111 until the valve port 111 is fully open. That is, when the valve core assembly 10 is in the fully open state, the second valve core 122 is misaligned with the valve port 111, and the first valve core 121 is misaligned with the balance hole 1221. The stationary valve core 11 blocks the end of the balance hole 1221 away from the first valve core 121. In this way, the second valve core 122 will move to the area on the stationary valve core 11 where there is no valve port 111, avoiding obstruction of the valve port 111 and realizing full flow at the valve port 111. During the valve closing process, when the first valve core 121 rotates in the reverse direction, the first valve core 121 will first cover and block the balance hole 1221. At this time, the valve port 111 is still in the fully open state. That is, when the valve core assembly 10 is in the fully open state, the first valve core 121 can also cover the balance hole 1221.
[0043] In summary, the valve core assembly 10 achieves the valve opening process through different cooperation methods between the first valve core 121, the second valve core 122, and the stationary valve core 11 in the fully closed state, the first transition state, and the fully open state. When the valve core assembly 10 needs to close, the valve stem 31 controls the first valve core 121 to rotate in the opposite direction. Since there is no stop in the closing direction, the first valve core 121 can rotate relative to the second valve core 122 until the first valve core 121 rotates to the second preset position.
[0044] When the first valve core 121 rotates to the second preset position in the valve-closing direction, the first valve core 121 re-covers and seals the balance hole 1221, and the first valve core 121 and the second valve core 122 cooperate, thereby driving the second valve core 122 to rotate synchronously. In this way, the rotation control of the first valve core 121 and the second valve core 122 can be achieved solely by rotating the valve stem 31, completing the entire valve-closing step, making operation simpler. The valve core assembly 10 also has a second transition state corresponding to the second preset position, which is easy to understand. When the valve core assembly 10 is in the second transition state, such as... Figure 6 As shown, the second valve core 122 is offset from the valve port 111, and the first valve core 121 and the stationary valve core 11 are respectively sealed at both ends of the balance hole 1221.
[0045] Specifically, a second limiting portion 1223 is formed on the surface of the second valve core 122 near the first valve core 121. The second limiting portion 1223 is spaced apart from the first limiting portion 1222 along the circumference of the second valve core 122. When the first valve core 121 rotates in the closing direction, the first valve core 121 covers the balance hole 1221 and can contact the second limiting portion 1223, thereby driving the second valve core 122 to rotate synchronously so that the second valve core 122 can cover the valve port 111. In this way, the method by which the first valve core 121 drives the second valve core 122 to rotate is relatively simple and easy to manufacture. For example, the second limiting portion 1223 can be set as a strip-shaped or columnar protrusion, etc.
[0046] Furthermore, when the first valve core 121 continues to rotate in the direction of closing the valve at the second preset position, since the first valve core 121 can drive the second valve core 122 to rotate synchronously, under the drive of the first valve core 121, the second valve core 122 can gradually rotate and block the valve port 111 until it moves to the fully closed position, thereby blocking the valve port 111.
[0047] In one embodiment, such as Figure 5 As shown, there are two valve ports 111, and the two valve ports 111 are arranged rotationally symmetrically with respect to the center of the stationary valve core 11. Therefore, the first valve core 121 and the second valve core 122 also have a rotationally symmetrical structure. Based on this, in order to improve the stability when the first valve core 121 drives the second valve core 122 to rotate synchronously, in one embodiment, there are two first limiting parts 1222. When the first valve core 121 rotates in the valve opening direction, the two first limiting parts 1222 can respectively abut against both ends of the first valve core 121. Furthermore, there are two second limiting parts 1223. When the first valve core 121 rotates in the valve closing direction, the two second limiting parts 1223 can respectively abut against both ends of the first valve core 121.
[0048] To further reduce the rotational resistance between the components within the valve core assembly 10, in one embodiment, the stationary valve core 11, the first valve core 121, and the second valve core 122 are all made of ceramic. The smooth surface of the ceramic material results in low friction, effectively reducing the torque required to drive the first valve core 121 and the second valve core 122, thus saving costs. Furthermore, the high hardness and wear resistance of the ceramic material significantly extend the service life of the valve core assembly 10.
[0049] In one embodiment, such as Figure 2 As shown, a drive groove 1211 is formed in the recess on the side of the first valve core 121 away from the second valve core 122. The drive groove 1211 is used to connect with the external drive assembly 30 to drive the first valve core 121 to rotate. Specifically, the drive assembly 30 is engaged by inserting the end of the valve stem 31 into the drive groove 1211, thereby driving the first valve core 121 to rotate.
[0050] 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.
[0051] 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 valve core assembly, comprising a stationary valve core (11) and a moving valve core (12), wherein the stationary valve core (11) has a valve port (111), the moving valve core (12) abuts against the stationary valve core (11) and is rotatable relative to the stationary valve core (11), and, as the moving valve core (12) rotates, the moving valve core (12) is able to open or close the valve port (111). Its features are, The moving valve core (12) includes a first valve core (121) and a second valve core (122). The second valve core (122) is sandwiched between the first valve core (121) and the stationary valve core (11) and can rotate with the first valve core (121) and the stationary valve core (11) respectively. The second valve core (122) has a through-hole (1221) and the flow area of the balance hole (1221) is smaller than the flow area of the valve port (111). The valve core assembly has a fully closed state and a first transition state. When the valve core assembly is in the fully closed state, the second valve core (122) covers the valve port (111), and one end of the balance hole (1221) is connected to the valve port (111). The first valve core (121) is blocked at the end of the balance hole (1221) away from the valve port (111). When the valve core assembly is in the first transition state, the second valve core (122) covers the valve port (111), one end of the balance hole (1221) is connected to the valve port (111), and the first valve core (121) and the balance hole (1221) are misaligned.
2. The valve core assembly according to claim 1, characterized in that, The valve core assembly also has a fully open state. When the valve core assembly is in the fully open state, the second valve core (122) is misaligned with the valve port (111), the first valve core (121) blocks the balance hole (1221) or is misaligned with the balance hole (1221), and the stationary valve core (11) blocks the balance hole (1221) at the end away from the first valve core (121).
3. The valve core assembly according to claim 1, characterized in that, The valve core assembly also has a second transition state. When the valve core assembly is in the second transition state, the second valve core (122) is misaligned with the valve port (111), and the first valve core (121) and the static valve core (11) are respectively blocked at both ends of the balance hole (1221).
4. The valve core assembly according to any one of claims 1-3, characterized in that, The second valve core (122) has a first limiting part (1222) protruding from the surface of the side near the first valve core (121). When the first valve core (121) rotates in the valve opening direction, the first valve core (121) avoids the balance hole (1221), and the first valve core (121) can contact the first limiting part (1222) to drive the second valve core (122) to rotate synchronously, so that the second valve core (122) can avoid the valve port (111).
5. The valve core assembly according to claim 4, characterized in that, The second valve core (122) has a second limiting part (1223) protruding from the surface of the second valve core (121) near the first valve core (121). The second limiting part (1223) is spaced apart from the first limiting part (1222) along the circumference of the second valve core (122). When the first valve core (121) rotates in the direction of closing the valve, the first valve core (121) covers the balance hole (1221), and the first valve core (121) can contact the second limiting part (1223) to drive the second valve core (122) to rotate synchronously so that the second valve core (122) can cover the valve port (111).
6. The valve core assembly according to claim 5, characterized in that, There are two first limiting parts (1222). When the first valve core (121) rotates in the valve opening direction, the two first limiting parts (1222) can respectively abut against the two ends of the first valve core (121). And / or, there are two second limiting parts (1223), and when the first valve core (121) rotates in the valve closing direction, the two second limiting parts (1223) can respectively abut against the two ends of the first valve core (121).
7. The valve core assembly according to claim 1, characterized in that, The first valve core (121) has a recessed drive groove (1211) on the side away from the second valve core (122), which is used to connect with an external drive assembly (30).
8. The valve core assembly according to claim 1, characterized in that, The outer wall of the static valve core (11) protrudes outward to form an anti-rotation part (112), which is used to cooperate with the external valve body assembly (20).
9. The valve core assembly according to claim 1, characterized in that, The static valve core (11), the first valve core (121) and the second valve core (122) are all configured as ceramic parts.
10. A shut-off valve, characterized in that, The device includes a valve body assembly (20), a drive assembly (30), and a valve core assembly as described in any one of claims 1 to 9. The valve body assembly (20) includes a main valve body (21), a valve seat (22), a mounting flange (23), a first connecting pipe (24), and a second connecting pipe (25). A valve cavity (211) is provided in the main valve body (211). Along the axial direction of the valve cavity (211), the valve seat (22) is installed at one end of the valve cavity (211), and one end of the valve seat (22) is connected to the valve core assembly, while the other end is connected to the first connecting pipe (24). The mounting flange (23) is provided at one end of the main valve body (21) and is axially stop-fitted with the valve seat (22). The second connecting pipe (25) is connected to the periphery of the main valve body (21). The drive assembly (30) includes a valve stem (31), an elastic element (32), a fixing element (33), a first bearing (34), and a second bearing (35). The valve stem (31) is rotatably disposed in the valve cavity (211), and one end of the valve stem (31) is connected to the moving valve core (12) for driving the moving valve core (12) to rotate. The valve stem (31) has a mounting portion (311) protruding from its periphery. The fixing member (33) is sleeved on the end of the valve stem (31) away from the moving valve core (12), and the outer wall of the fixing member (33) is fixedly connected to the inner wall of the valve cavity (211). The elastic member (32) and the first bearing (34) are installed between the mounting part (311) and the fixing member (33), and one end of the elastic member (32) abuts against the mounting part (311), and the other end applies force to the first bearing (34) so that the first bearing (34) abuts against the fixing member (33). The second bearing (35) is located at the end of the fixing member (33) away from the first bearing (34), and the outer ring of the second bearing (35) is connected to the fixing member (33), and the inner ring of the second bearing (35) is sleeved and connected to the valve stem (31).