electric valve

Abstract

This application relates to the field of valve technology, and in particular to an electric valve. The electric valve includes a valve body assembly and a gate assembly. The valve body assembly has a flow chamber, a first flow port, and a second flow port. The gate assembly is movably installed within the flow chamber to control the opening and closing of the first and second flow ports. The gate assembly includes a sealing valve head and a pilot valve head. The sealing valve head has a pilot valve chamber, a first through hole, and a second through hole. One end of the pilot valve head is movably installed within the pilot valve chamber, and the outer wall of the pilot valve head can movably seal against the inner wall of the pilot valve chamber. In the fully closed state, the sealing valve head blocks one or both of the first and second flow ports, and the pilot valve head blocks one or both of the first and second through holes. The electric valve provided by this application solves the problem of the difficulty in opening existing gate valves.

Description

Technical Field

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

[0002] A gate valve is a type of valve that uses a gate to open and close. In some designs, the gate valve has two coaxially arranged flow ports, where the gate's movement is perpendicular to the fluid flow direction. During operation, the fluid can flow in a straight line between the two ports. When closed, the gate blocks both ports. This design results in low flow resistance, but it also creates a significant pressure difference across the gate when closing. The gate, under fluid pressure, presses tightly against the valve body on the lower-pressure side, increasing the difficulty and time required to open the valve. Utility Model Content

[0003] Therefore, it is necessary to provide an electric valve to solve the problem of the difficulty in opening existing gate valves.

[0004] This application provides an electric valve, which includes a valve body assembly and a gate assembly. The valve body assembly has a flow cavity and a first flow port and a second flow port communicating with the flow cavity. The gate assembly is movably installed in the flow cavity for controlling the opening and closing of the first flow port and the second flow port. The gate assembly includes a sealing valve head and a pilot valve head. The sealing valve head has a pilot valve cavity and a first through hole and a second through hole communicating with the pilot valve cavity. The first through hole communicates with the first flow port, and the second through hole communicates with the second flow port. One end of the pilot valve head is movably installed in the pilot valve cavity, and the outer wall of the pilot valve head can be movably sealed with the inner wall of the pilot valve cavity. The electric valve has a fully closed state, and in the fully closed state, the sealing valve head blocks one or both of the first flow port and the second flow port, and the pilot valve head blocks one or both of the first through hole and the second through hole.

[0005] In one embodiment, the first through hole and the second through hole are spaced apart axially in the pilot valve cavity. In the fully closed state, the pilot valve head is blocked in one of the first through hole and the second through hole, and the other of the first through hole and the second through hole communicates with the pilot valve cavity.

[0006] In one embodiment, the electric valve further includes a first sealing element and a second sealing element, which are disposed between the inner wall of the pilot valve cavity and the pilot valve head, and are capable of sealingly engaging with the inner wall of the pilot valve cavity and the pilot valve head, respectively; the electric valve further includes a valve stem, one end of which is connected to the gate assembly, wherein, along the axial direction of the pilot valve cavity, the first through hole is located on the side of the second through hole near the valve stem, and, in the fully closed state, the projection of the first through hole along its own axial direction onto the pilot valve head is located between the first sealing element and the second sealing element.

[0007] In one embodiment, both the first sealing element and the second sealing element are mounted on the outer wall of the pilot valve head.

[0008] In one embodiment, in the fully closed state, the pilot valve head is blocked in the first through hole and the second through hole.

[0009] In one embodiment, the chambers located at both ends of the pilot valve head are defined as a first pilot valve chamber and a second pilot valve chamber, respectively. A balance flow channel is provided on the pilot valve head, and the two ends of the balance flow channel are respectively connected to the first pilot valve chamber and the second pilot valve chamber.

[0010] In one embodiment, the electric valve further includes a third sealing element, a fourth sealing element, and a fifth sealing element, which are disposed between the inner wall of the pilot valve cavity and the pilot valve head, and are capable of sealingly engaging with the inner wall of the pilot valve cavity and the pilot valve head, respectively. The electric valve also includes a valve stem, one end of which is connected to the gate assembly. Along the axial direction of the pilot valve cavity, the first through hole is located on the side of the second through hole near the valve stem. In the fully closed state, the projection of the first through hole along its own axial direction onto the pilot valve head is located between the third sealing element and the fourth sealing element, and the projection of the second through hole along its own axial direction onto the pilot valve head is located between the fourth sealing element and the fifth sealing element.

[0011] In one embodiment, the third sealing element, the fourth sealing element, and the fifth sealing element are all mounted on the outer wall of the pilot valve head.

[0012] In one embodiment, the pilot valve head has a connecting cavity. In the fully closed state, the connecting cavity is located between the fourth sealing element and the fifth sealing element, or the connecting cavity is located between the third sealing element and the fourth sealing element. When the pilot valve head moves in the valve opening direction, the connecting cavity can connect the first through hole and the second through hole.

[0013] In one embodiment, the outer wall of the pilot valve head is recessed toward its own axis to form the communicating cavity.

[0014] In one embodiment, a gap exists between the opening of the first flow port and the second flow port near the opening of the flow cavity and the sealing valve head.

[0015] In one embodiment, the inner wall of the pilot valve chamber protrudes towards its own axis to form a first stop portion, and the outer wall of the pilot valve head is provided with a second stop portion; when the pilot valve head moves in the valve opening direction, the second stop portion can abut against the first stop portion axially, so that the pilot valve head can drive the sealing valve head to move axially.

[0016] In one embodiment, the valve body assembly includes a main valve body, a first valve seat core, and a second valve seat core, wherein the first valve seat core and the second valve seat core are mounted in the main valve body and are disposed opposite to each other; wherein, when the electric valve is in the fully closed state, the first valve seat core and / or the second valve seat core are in a sealing fit with the gate assembly.

[0017] In one embodiment, the electric valve further includes a first seal, wherein in the fully closed state, the first seal is disposed between the first valve seat core and the gate assembly, and the first seal is capable of sealingly engaging with the first valve seat core and the gate assembly respectively; and / or, in the fully closed state, the first seal is disposed between the second valve seat core and the gate assembly, and the first seal is capable of sealingly engaging with the second valve seat core and the gate assembly respectively.

[0018] In one embodiment, the first seal is mounted on the first valve seat core and / or the second valve seat core.

[0019] In one embodiment, the electric valve further includes a second seal, which is installed between the first seal and the first valve seat core and respectively seals with the first seal and the first valve seat core; and / or, the second seal is installed between the first seal and the second valve seat core and respectively seals with the first seal and the second valve seat core.

[0020] In one embodiment, the side of the gate assembly near the first valve seat core and the second valve seat core is arranged as a plane or an inclined plane.

[0021] In one embodiment, the first valve seat core and the second valve seat core are movably mounted in the main valve body.

[0022] In one embodiment, the electric valve further includes a first elastic element and a second elastic element. The two ends of the first elastic element are respectively connected to the main valve body and the first valve seat core to apply a force to the first valve seat core in a direction toward the gate assembly. The two ends of the second elastic element are respectively connected to the main valve body and the second valve seat core to apply a force to the second valve seat core in a direction toward the gate assembly.

[0023] In one embodiment, the gate assembly further includes a movable valve head connected to one end of the pilot valve head, and the movable valve head and the pilot valve head are capable of relative displacement in a direction perpendicular to the axis of the pilot valve head.

[0024] In one embodiment, the gate assembly further includes a connector that passes through and connects the pilot valve head and the movable valve head in a direction perpendicular to the axis of the pilot valve head, and the pilot valve head and the movable valve head can be movably engaged through the connector so that the pilot valve head can move relative to the movable valve head along the connector.

[0025] In one embodiment, one end of the pilot valve head is inserted into the movable valve head, and at least a portion of the outer wall of the pilot valve head is spaced apart from the inner wall of the movable valve head.

[0026] In one embodiment, the gate assembly further includes a nut sleeve disposed at the end of the movable valve head away from the pilot valve head; the electric valve further includes a valve stem and a rotor assembly, one end of the valve stem being threaded into the nut sleeve, and the other end being connected to the rotor assembly, so that the valve stem can rotate under the drive of the rotor assembly.

[0027] In one embodiment, the pilot valve head is cylindrical, and the pilot valve cavity is adapted to the shape of the pilot valve head.

[0028] Compared with existing technologies, the electric valve provided in this application, when in the fully closed state, prevents communication between the first and second flow ports through the flow cavity by sealing the valve head at one or both of the first and second flow ports. At this time, the pilot valve head, by sealing one or both of the first and second through holes, can completely cut off the communication between the first and second flow ports, preventing leakage and improving the safety of the electric valve in the fully closed state. As the pilot valve head moves to connect the first and second through holes, communication between the first and second flow ports can be achieved through the first through hole, the second through hole, and the pilot valve cavity. This helps reduce the fluid pressure difference between the first and second flow ports on both sides of the gate assembly, thereby reducing the overall movement difficulty of the gate assembly and effectively improving valve opening performance. Attached Figure Description

[0029] 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.

[0030] Figure 1 A cross-sectional view (closed state) of an electric valve according to an embodiment provided in this application.

[0031] Figure 2 A cross-sectional view (open valve state) of an electric valve according to an embodiment provided in this application.

[0032] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0033] Figure 4 A cross-sectional view (valve closed state) of an electric valve according to another embodiment provided in this application.

[0034] Figure 5 A cross-sectional view (open valve state) of an electric valve according to another embodiment provided in this application.

[0035] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0036] Figure 7 A cross-sectional view of an electric valve according to an embodiment provided in this application;

[0037] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0038] Figure 9A cross-sectional view of an electric valve according to an embodiment provided in this application;

[0039] Figure 10 for Figure 9 Enlarged view of point D in the middle.

[0040] The symbols in the diagram represent the following meanings:

[0041] 100. Electric valve; 10. Valve body assembly; 101. Flow chamber; 102. First flow port; 103. Second flow port; 11. Main valve body; 12. First valve seat core; 13. Second valve seat core; 14. First seal; 15. Second seal; 16. Third seal; 17. First elastic element; 18. Second elastic element; 20. Gate assembly; 201. Pilot valve chamber; 2011. First pilot valve chamber; 2012. Second pilot valve chamber; 202. First through hole; 203. Second through hole; 2 04. Balanced flow channel; 205. Communicating cavity; 21. First valve head; 211. Movable valve head; 212. Nut sleeve; 22. Second valve head; 221. Sealing valve head; 2211. First stop; 222. Pilot valve head; 2221. Second stop; 2222. First sealing element; 2223. Second sealing element; 2224. Third sealing element; 2225. Fourth sealing element; 2226. Fifth sealing element; 23. Connecting piece; 30. Valve stem; 40. Rotor assembly. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Please see Figures 1-10 This application provides an electric valve 100, which includes a valve body assembly 10 and a gate assembly 20. The valve body assembly 10 has a flow cavity 101 and a first flow port 102 and a second flow port 103 communicating with the flow cavity 101. The gate assembly 20 is movably installed in the flow cavity 101 and is used to control the opening and closing of the first flow port 102 and the second flow port 103. Here, the first flow port 102 and the second flow port 103 are designed as a straight-through type, that is, the first flow port 102 and the second flow port 103 are coaxially arranged.

[0048] To achieve axial movement of the gate assembly 20, the electric valve 100 also includes a valve stem 30 and a rotor assembly 40. One end of the valve stem 30 is connected to the gate assembly 20, and the rotor assembly 40 is connected to the valve stem 30 to drive the valve stem 30 to rotate, thereby driving the gate assembly 20 to move axially and realize the valve opening and closing.

[0049] Please see Figures 1-10The gate assembly 20 includes a first valve head 21 and a second valve head 22. One end of the second valve head 22 is located between the first flow port 102 and the second flow port 103, and the other end is movably connected to the first valve head 21. The second valve head 22 cooperates with the first flow port 102 and the second flow port 103 to achieve conduction or cutoff. The first valve head 21 slides and is guided against the inner wall of the flow cavity 101 and connected to the valve stem 30, thereby driving the gate assembly 20 to move.

[0050] Specifically, the first valve head 21 includes a movable valve head 211 and a nut sleeve 212. The outer wall of the movable valve head 211 slides and guides the inner wall of the flow cavity 101. The nut sleeve 212 can be integrally or separately disposed with the movable valve head 211. One end of the valve stem 30 is threadedly engaged with the nut sleeve 212, and the other end is connected to the rotor assembly 40, so that the valve stem 30 can rotate under the drive of the rotor assembly 40. Furthermore, in this embodiment, the valve stem 30 can be rotatably connected to the valve body assembly 10 through bearings, etc., while ensuring that the valve stem 30 does not move axially. That is, when the rotor assembly 40 drives the valve stem 30 to rotate, since the valve stem 30 does not move axially, it only rotates circumferentially. At this time, through the threaded engagement between the valve stem 30 and the nut sleeve 212, the circumferential rotation of the valve stem 30 can be converted into the axial movement of the nut sleeve 212, thereby realizing the movement of the gate assembly 20 within the flow cavity 101.

[0051] To facilitate the opening of the electric valve 100, the electric valve 100 in this embodiment adopts a pilot-operated structure, specifically, as shown in... Figure 3 and Figure 6 As shown, the second valve head 22 includes a sealing valve head 221 and a pilot valve head 222. The sealing valve head 221 has a pilot valve cavity 201 and a first through hole 202 and a second through hole 203 communicating with the pilot valve cavity 201. The first through hole 202 communicates with the first flow port 102, and the second through hole 203 communicates with the second flow port 103. One end of the pilot valve head 222 is movably installed in the pilot valve cavity 201, and the outer wall of the pilot valve head 222 can be movably sealed with the inner wall of the pilot valve cavity 201 to control the opening and closing of the first through hole 202 and the second through hole 203. The electric valve 100 has a fully closed state, and in the fully closed state, the sealing valve head 221 is blocked in one or both of the first flow port 102 and the second flow port 103, and the pilot valve head 222 is blocked in one or both of the first through hole 202 and the second through hole 203.

[0052] Understandably, when the electric valve 100 is in the fully closed state, the sealing valve head 221, by blocking one or both of the first flow port 102 and the second flow port 103, can prevent the first flow port 102 and the second flow port 103 from being connected through the flow chamber 101. At this time, the pilot valve head 222, by blocking one or both of the first through hole 202 and the second through hole 203, can completely cut off the connection between the first flow port 102 and the second flow port 103, preventing leakage and improving the safety of the electric valve 100 in the fully closed state. As the pilot valve head 222 moves to connect the first through hole 202 and the second through hole 203, the first flow port 102 and the second flow port 103 can be connected through the first through hole 202, the second through hole 203 and the pilot valve chamber 201, which helps to reduce the fluid pressure difference between the first flow port 102 and the second flow port 103 on both sides of the gate assembly 20, thereby reducing the overall movement difficulty of the gate assembly 20 and effectively improving the valve opening performance.

[0053] It should be noted that when the sealing valve head 221 is blocked in either the first flow port 102 or the second flow port 103, the pilot valve head 222 must be blocked in at least one through hole corresponding to the blocked flow port. For example, if the sealing valve head 221 is blocked in the first flow port 102, then the pilot valve head 222 must be blocked in at least the first through hole 202 to achieve a complete seal on the first flow port 102.

[0054] It should also be noted that the sealing valve head 221 can usually seal the first flow port 102 and the second flow port 103 simultaneously in the fully closed state. However, the sealing valve head 221 is usually blocked in one of the first flow port 102 and the second flow port 103 due to objective factors. Specifically, since one of the first flow port 102 and the second flow port 103 is high pressure and the other is low pressure, when subjected to fluid pressure, there may be a gap between the sealing valve head 221 and the flow port corresponding to the high pressure. As a result, the sealing valve head 221 can only block the flow port corresponding to the low pressure in the first flow port 102 and the second flow port 103. Based on this, in order to reduce the risk of leakage, the pilot valve head 222 can be blocked in the through hole corresponding to the low pressure flow port in the fully closed state by controlling the fluid direction and the position of the through hole.

[0055] In one embodiment, such as Figures 1-6As shown, the first through hole 202 and the second through hole 203 are spaced apart axially in the pilot valve cavity 201. In the fully closed state, the pilot valve head 222 is blocked in one of the first through hole 202 and the second through hole 203, while the other of the first through hole 202 and the second through hole 203 is connected to the pilot valve cavity 201. That is, in this embodiment, in the fully closed state, it is only necessary to control the pilot valve head 222 to move and block one of the two through holes to achieve the complete cutoff of the flow channel. At the same time, the other through hole can still maintain communication with the pilot valve cavity 201 and the external pipeline. In this way, the difficulty of sealing the first through hole 202 or the second through hole 203 can be reduced.

[0056] Specifically, the electric valve 100 also includes a first sealing element 2222 and a second sealing element 2223. The first sealing element 2222 and the second sealing element 2223 are disposed between the inner wall of the pilot valve chamber 201 and the pilot valve head 222, and can respectively seal against the inner wall of the pilot valve chamber 201 and the pilot valve head 222. Along the axial direction of the pilot valve chamber 201, the first through hole 202 is located on the side of the second through hole 203 near the valve stem 30. Furthermore, in the fully closed state, the projection of the first through hole 202 along its own axial direction onto the pilot valve head 222 is located between the first sealing element 2222 and the second sealing element 2223. Thus, the cooperation of the first sealing element 2222 and the second sealing element 2223 can completely cut off the flow path between the first through hole 202 and the second through hole 203 in the fully closed state. That is, the fluid in the first pilot valve chamber 2011 and the first pilot valve chamber 2011 will not flow with the first through hole 202, effectively preventing internal leakage. The first sealing element 2222 and the second sealing element 2223 can be configured as parallel sealing rings, which have a simple structure and are easy to install.

[0057] Furthermore, in this embodiment, both the first sealing element 2222 and the second sealing element 2223 are mounted on the outer wall of the pilot valve head 222. Thus, the first sealing element 2222 and the second sealing element 2223 can move with the pilot valve head 222, thereby achieving a sealing fit during the movement of the pilot valve head 222 without the need for additional sealing, further improving sealing performance and reducing costs. A groove can be formed on the outer wall of the pilot valve head 222 for the matching installation of the first sealing element 2222 and the second sealing element 2223, thereby ensuring the installation strength of the first sealing element 2222 and the second sealing element 2223.

[0058] However, it is not limited to this. The first sealing element 2222 and the second sealing element 2223 can also be installed on the inner wall of the pilot valve cavity 201. The specific configuration can be reasonably set according to actual needs.

[0059] Due to the arrangement of the first sealing element 2222 and the second sealing element 2223, in the fully closed state, the first sealing element 2222 and the second sealing element 2223 will divide the pilot valve chamber 201 into three parts, namely, the cavity located at the first sealing element 2222 away from the second sealing element 2223, the cavity located at the second sealing element 2223 away from the first sealing element 2222, and the cavity between the first sealing element 2222 and the second sealing element 2223. Here, the cavity between the first sealing element 2222 and the second sealing element 2223 is mainly the annular gap between the outer wall of the pilot valve head 222 and the inner wall of the pilot valve chamber 201. This gap will communicate with one of the first through hole 202 or the second through hole 203. Since the pressure of the flowing fluid is equal, the pressure balance in the axial direction of the pilot valve head 222 can be achieved. Further, the chambers located at both axial ends of the pilot valve head 222 are defined as the first pilot valve chamber 2011 and the second pilot valve chamber 2012, respectively. A balance flow channel 204 is provided on the pilot valve head 222, and the two ends of the balance flow channel 204 are connected to the first pilot valve chamber 2011 and the second pilot valve chamber 2012, respectively. For ease of explanation, the chamber closer to the valve stem 30 can be defined as the first pilot valve chamber 2011, and the chamber farther from the valve stem 30 can be defined as the second pilot valve chamber 2012. In a specific embodiment of this application, the annular gap is connected to the first through hole 202, and the second pilot valve chamber 2012 is connected to the second through hole 203. By setting the balance flow channel 204, it is ensured that the first pilot valve chamber 2011 and the second pilot valve chamber 2012 have fluid media with similar pressures, thereby achieving pressure balance at both axial ends of the pilot valve head 222.

[0060] In summary, in this embodiment, the pilot valve head 222 is subjected to balanced axial forces, which greatly reduces the difficulty of moving the pilot valve head 222 and effectively improves the valve opening performance.

[0061] In another embodiment, such as Figures 7-10 As shown, in the fully closed state, the pilot valve head 222 is blocked in the first through hole 202 and the second through hole 203. Thus, when the pilot valve head 222 moves to block both through holes, the entire flow path can be cut off. Simultaneously, the sealing safety of the entire valve head structure is higher, effectively preventing fluid from communicating with the corresponding flow port through the first through hole 202 or the second through hole 203 in the fully closed state. Even if a gap is created between the high-pressure flow port and the sealing valve head 221 due to pressure difference, internal leakage can still be avoided.

[0062] For example, there is a gap between the opening of the first flow port 102 and the second flow port 103 near the flow cavity 101 and the sealing valve head 221. This gap is the gap generated between the sealing valve head 221 and the flow port corresponding to high pressure when subjected to fluid pressure.

[0063] Specifically, along the axial direction of the pilot valve cavity 201, the first through hole 202 is located on the side of the second through hole 203 near the valve stem 30. That is, in this embodiment, the first through hole 202 and the second through hole 203 are spaced apart in the axial direction. Based on this, in order to achieve the sealing of the pilot valve head 222 on the first through hole 202 and the second through hole 203, the electric valve 100 also includes a third sealing element 2224, a fourth sealing element 2225 and a fifth sealing element 2226. The third sealing element 2224, the fourth sealing element 2225 and the fifth sealing element 2226 are disposed between the inner wall of the pilot valve cavity 201 and the pilot valve head 222, and can respectively seal and cooperate with the inner wall of the pilot valve cavity 201 and the pilot valve head 222. In the fully closed state, the projection of the first through-hole 202 along its own axial direction onto the pilot valve head 222 lies between the third sealing element 2224 and the fourth sealing element 2225, while the projection of the second through-hole 203 along its own axial direction onto the pilot valve head 222 lies between the fourth sealing element 2225 and the fifth sealing element 2226. Thus, the cooperation of the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226 completely cuts off the flow path between the first through-hole 202 and the second through-hole 203 in the fully closed state, effectively preventing internal leakage. The third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226 can be configured as parallel sealing rings, resulting in a simple structure and convenient installation.

[0064] However, it is not limited to this. The axes of the first through hole 202 and the second through hole 203 can also be on the same straight line. In this case, a special-shaped sealing element can be provided between the pilot valve head 222 and the inner wall of the pilot valve cavity 201. As long as the special-shaped sealing element can seal the first through hole 202 and the second through hole 203 along the axial and circumferential flow paths of the pilot valve cavity 201, it will not be explained in detail here.

[0065] Furthermore, in this embodiment, the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226 are all mounted on the outer wall of the pilot valve head 222. Thus, the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226 can move with the pilot valve head 222, thereby achieving a sealing fit during the movement of the pilot valve head 222 without the need for additional seals, further improving sealing performance and reducing costs. A groove can be formed on the outer wall of the pilot valve head 222 for the matching installation of the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226, thereby ensuring the installation strength of the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226.

[0066] However, it is not limited to this. The third sealing element 2224, the fourth sealing element 2225 and the fifth sealing element 2226 can also be installed on the inner wall of the pilot valve chamber 201. The specific settings can be reasonably configured according to actual needs.

[0067] To achieve communication between the first through hole 202 and the second through hole 203 when the valve is opened, a connecting cavity 205 is provided on the pilot valve head 222. When the pilot valve head 222 moves in the valve opening direction, the connecting cavity 205 can connect the first through hole 202 and the second through hole 203. Specifically, in the fully closed state, the connecting cavity 205 is located between the fourth sealing element 2225 and the fifth sealing element 2226, or between the third sealing element 2224 and the fourth sealing element 2225. It is easy to understand that the connecting cavity 205 can be reasonably set according to the moving direction of the pilot valve head 222 when the valve is opened and the relative position between the first through hole 202 and the second through hole 203.

[0068] Specifically, the outer wall of the pilot valve head 222 is recessed towards its own axis to form a connecting cavity 205. Thus, the connecting cavity 205 has a simple structure and is easy to process.

[0069] Similarly, in this embodiment, a balance flow channel 204 is provided on the pilot valve head 222, and in conjunction with the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226, the axial force of the pilot valve head 222 is balanced in the fully closed state, thereby greatly reducing the difficulty of moving the pilot valve head 222 and effectively improving the valve opening performance. It should be noted that the second pilot valve chamber 2012 in this embodiment can be formed in part of the pilot valve chamber 201, or it can be formed in part of the flow chamber 101.

[0070] Furthermore, in one embodiment, the pilot valve head 222 is cylindrical, and the pilot valve cavity 201 is adapted to the shape of the pilot valve head 222. That is, both the pilot valve cavity 201 and the pilot valve head 222 are cylindrical, which is simple in structure, easy to process, and facilitates the installation of the first sealing element 2222, the second sealing element 2223, the third sealing element 2224, the fourth sealing element 2225, and the fifth sealing element 2226.

[0071] In one embodiment, such as Figure 3 , Figure 6 , Figure 8 and Figure 10 As shown, the inner wall of the pilot valve chamber 201 protrudes towards its own axis to form a first stop portion 2211, and the outer wall of the pilot valve head 222 is provided with a second stop portion 2221. When the pilot valve head 222 moves in the valve opening direction, the second stop portion 2221 can abut against the first stop portion 2211 axially, so that the pilot valve head 222 can drive the sealing valve head 221 to move axially. Thus, as... Figure 2 and Figure 5 As shown, the pilot valve head 222 can smoothly drive the sealing valve head 221 to move, so that the sealing valve head 221 disengages from the first flow port 102 and the second flow port 103, thereby achieving full flow through the first flow port 102 and the second flow port 103.

[0072] To ensure that the gate assembly 20 can reliably seal the first flow port 102 and the second flow port 103 when fully closed, in one embodiment, such as Figures 1-10 As shown, the valve body assembly 10 includes a main valve body 11, a first valve seat core 12, and a second valve seat core 13. The first valve seat core 12 and the second valve seat core 13 are installed inside the main valve body 11 and are arranged opposite to each other. Here, the first valve seat core 12 and the second valve seat core 13 can be integrally or separately arranged with the main valve body 11. The first valve seat core 12 has a first flow port 102, and the second valve seat core 13 has a second flow port 103. When the electric valve 100 is in the fully closed state, the first valve seat core 12 and / or the second valve seat core 13 are sealed to the gate assembly 20 to block the first flow port 102 and / or the second flow port 103.

[0073] Taking the first valve seat core 12 and the second valve seat core 13 as an integral part of the main valve body 11 as an example, when fluid flows in from the first flow port 102, one side of the gate assembly 20 is sealed to the second valve seat core 13, while the other side of the gate assembly 20 forms a gap with the first valve seat core 12 to block the second flow port 103. That is, at this time, the first flow port 102 is under high pressure, and under the action of pressure difference, the gate assembly 20 may deviate from the first valve seat core 12, thus forming a gap. At this time, the gate assembly 20, through its sealing cooperation with the second valve seat core 13, can block the second flow port 103, ensuring the sealing performance when the valve is closed and avoiding internal leakage. When fluid flows in from the second flow port 103, one side of the gate assembly 20 is sealed to the first valve seat core 12, while the other side of the gate assembly 20 forms a gap with the second valve seat core 13 to block the first flow port 102. That is, at this time, the second flow port 103 is under high pressure. Under the action of pressure difference, the gate assembly 20 may move away from the second valve seat core 13, thus forming a gap. At this time, the gate assembly 20 can seal the first flow port 102 by sealing with the first valve seat core 12, ensuring the sealing performance when the valve is closed and avoiding internal leakage. When fluid flows in from the first flow port 102 or the second flow port 103, the two sides of the gate assembly 20 seal with the first valve seat core 12 and the second valve seat core 13 respectively, to seal the first flow port 102 and the second flow port 103. In this way, no matter which direction the fluid flows in, since the gate assembly 20 can seal with the first valve seat core 12 and the second valve seat core 13, the sealing performance can always be maintained.

[0074] For ease of explanation, this embodiment is described in terms of the fact that both the first valve seat core 12 and the second valve seat core 13 can achieve a sealing fit with the gate assembly 20, without considering the sealing problem caused by the pressure difference.

[0075] Specifically, the electric valve 100 further includes a first sealing element 14. In the fully closed state, the first sealing element 14 is disposed between the first valve seat core 12 and the gate assembly 20, and the first sealing element 14 can respectively seal with the first valve seat core 12 and the gate assembly 20; and / or, in the fully closed state, the first sealing element 14 is disposed between the second valve seat core 13 and the gate assembly 20, and the first sealing element 14 can respectively seal with the second valve seat core 13 and the gate assembly 20. That is, in this embodiment, the sealing effect between the first valve seat core 12 and / or the second valve seat core 13 and the gate assembly 20 in the fully closed state can be achieved through the first sealing element 14.

[0076] Here, the first seal 14 can be installed on the first valve seat core 12 and / or the second valve seat core 13 to ensure the reliability of the installation of the first seal 14.

[0077] Furthermore, the electric valve 100 also includes a second seal 15, which is installed between the first seal 14 and the first valve seat core 12, and is in sealing engagement with both the first seal 14 and the first valve seat core 12. Alternatively, the second seal 15 is installed between the first seal 14 and the second valve seat core 13, and is in sealing engagement with both the first seal 14 and the second valve seat core 13. Thus, the cooperation of the first seal 14 and the second seal 15 further enhances the sealing performance of the gate assembly 20 to the first flow port 102 and the second flow port 103, eliminating the potential for internal leakage when the valve is closed.

[0078] In one embodiment, such as Figures 1-3 As shown, the side of the gate assembly 20 near the first valve seat core 12 and the second valve seat core 13 is set in a plane. At this time, the sealing valve head 221 adopts a parallel structure, which is simple in structure and can reduce processing and manufacturing costs.

[0079] In another embodiment, such as Figures 4-6 As shown, the side of the gate assembly 20 near the first valve seat core 12 and the second valve seat core 13 is set at an angle. At this time, the sealing valve head 221 adopts a wedge structure. During the valve opening process, the sealing valve head 221 can be directly separated from the first valve seat core 12 and the second valve seat core 13, reducing the wear of the sealing surface and thus effectively extending the service life of the gate assembly 20.

[0080] During operation, the gate assembly 20 of the electric valve 100 will come into close contact with the valve seat core on the low-pressure side due to the pressure difference between the two sides. This may cause a gap to form between the valve seat core on the high-pressure side and the gate assembly 20, thus affecting the seal. Therefore, to ensure the sealing effect between the gate assembly 20 and the first valve seat core 12 and the second valve seat core 13, in one embodiment, such as... Figure 1 , Figure 2 and Figure 7 As shown, the first valve seat core 12 and / or the second valve seat core 13 are movably engaged with the main valve body 11, thereby achieving a floating effect of the first valve seat core 12 and / or the second valve seat core 13 within the main valve body 11. Therefore, the valve seat core on the high-pressure side can automatically fit with the gate assembly 20 under fluid pressure to achieve a seal, effectively enhancing the sealing performance when the valve is closed.

[0081] Furthermore, the electric valve 100 also includes a first elastic element 17 and a second elastic element 18. The two ends of the first elastic element 17 are respectively connected to the main valve body 11 and the first valve seat core 12 to apply a force to the first valve seat core 12 in the direction of approaching the gate assembly 20. The two ends of the second elastic element 18 are respectively connected to the main valve body 11 and the second valve seat core 13 to apply a force to the second valve seat core 13 in the direction of approaching the gate assembly 20.

[0082] Understandably, the first elastic element 17 and the second elastic element 18 can compensate for the first valve seat core 12 or the second valve seat core 13 respectively. Simultaneously, in conjunction with the floating first valve seat core 12 and the second valve seat core 13, the sealing surfaces on the first valve seat core 12 and the second valve seat core 13 can always automatically and tightly contact the gate assembly 20 to ensure sealing performance. Furthermore, during the valve opening process of the gate assembly 20, even if particles or other impurities enter the gap between the first valve seat core 12 or the second valve seat core 13 and the gate assembly 20, due to the available movement of the first valve seat core 12 and the second valve seat core 13, the gate assembly 20 can apply force to the first valve seat core 12 and the second valve seat core 13, causing them to move and preventing jamming, thereby ensuring that the gate assembly 20 can move smoothly to open the valve.

[0083] In this embodiment, the first valve seat core 12 and the second valve seat core 13 are designed to be floating. To prevent fluid leakage from the gap between the first valve seat core 12 and the second valve seat core 13 and the main valve body 11, such as... Figure 1 , Figure 2 and Figure 7 As shown, the valve body assembly 10 further includes a third seal 16, which is installed between the first valve seat core 12 and the main valve body 11, and respectively seals against the first valve seat core 12 and the main valve body 11; and / or, the third seal 16 is installed between the second valve seat core 13 and the main valve body 11, and respectively seals against the second valve seat core 13 and the main valve body 11. This further ensures the sealing performance of the electric valve 100.

[0084] In one embodiment, to prevent the gate assembly 20 from jamming during movement, such as Figures 1-10 As shown, the second valve head 22 and the first valve head 21 are capable of relative displacement in a direction perpendicular to the axis of the second valve head 22. Specifically, the movable valve head 211 is connected to one end of the pilot valve head 222, and the movable valve head 211 and the pilot valve head 222 are capable of relative displacement in a direction perpendicular to the axis of the pilot valve head 222. The nut sleeve 212 is located at the end of the movable valve head 211 away from the pilot valve head 222.

[0085] Understandably, this configuration allows the second valve head 22 to float relative to the first valve head 21. During the opening process of the gate assembly 20, even if particles or other impurities enter the gap between the second valve head 22 and the valve body assembly 10, the second valve head 22 can be appropriately offset due to its mobility, preventing jamming during axial movement and ensuring that the gate assembly 20 can move smoothly to open the valve. On the other hand, it also solves the problem of the gate assembly 20 jamming with other components due to excessive pressure difference, preventing smooth valve opening. Simultaneously, in the fully closed state, there is a gap between the opening of one of the first flow port 102 and the second flow port 103 near the flow chamber 101 and the second valve head 22. This gap is the gap generated between the second valve head 22 and the high-pressure flow port when subjected to fluid pressure. However, regardless of which side of the first flow port 102 or the second flow port 103 has a higher fluid pressure, the fluid on the high-pressure side can press the gate assembly 20 tightly against the low-pressure flow port, effectively ensuring sealing when the valve is closed and preventing internal leakage.

[0086] Since the second valve head 22 can undergo relative displacement in a direction perpendicular to the axis of the pilot valve head 222, the second valve head 22 itself can achieve a good sealing fit with the first valve seat core 12 and the second valve seat core 13 under the action of pressure difference. Therefore, in this embodiment, as... Figure 4 , Figure 5 and Figure 9 As shown, the first valve seat core 12 and the second valve seat core 13 can also be fixedly installed with the main valve body 11.

[0087] Furthermore, in one embodiment, the gate assembly 20 further includes a connector 23. The connector 23 passes through and connects the first valve head 21 and the second valve head 22 in a direction perpendicular to the axis of the second valve head 22. The second valve head 22 and the first valve head 21 are movably engaged through the connector 23, allowing the second valve head 22 to move relative to the first valve head 21 along the connector 23. Specifically, the connector 23 passes through and connects the pilot valve head 222 and the movable valve head 211 in a direction perpendicular to the axis of the pilot valve head 222. The pilot valve head 222 and the movable valve head 211 are movably engaged through the connector 23, allowing the pilot valve head 222 to move relative to the movable valve head 211 along the connector 23. The axis of the connector 23 can be parallel to the axis of the first flow port 102, thus achieving a movable connection between the pilot valve head 222 and the movable valve head 211 while preventing the pilot valve head 222 from moving axially relative to the movable valve head 211.

[0088] Furthermore, at least one end of the second valve head 22 is inserted into the first valve head 21, and the outer wall of the second valve head 22 is spaced apart from the inner wall of the first valve head 21. Specifically, one end of the pilot valve head 222 is inserted into the movable valve head 211, and the outer wall of the pilot valve head 222 is spaced apart from the inner wall of the movable valve head 211, so that the pilot valve head 222 can float radially relative to the movable valve head 211 along the connector 23.

[0089] Optionally, in this embodiment, the connector 23 is limitedly connected to the first valve head 21, and the connector 23 is movably connected to the second valve head 22. This simplifies the connection, reduces the length of the connector 23, saves costs, and decreases the likelihood of connection failure due to movement or collision of the connector 23.

[0090] In other embodiments, the connector 23 may be limited to the second valve head 22, and the connector 23 may be movably connected to the first valve head 21, as long as the first valve head 21 and the second valve head 22 can achieve a similar relative movement effect.

[0091] 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.

[0092] 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. An electric valve, comprising a valve body assembly (10) and a gate assembly (20), wherein the valve body assembly (10) has a flow chamber (101) and a first flow port (102) and a second flow port (103) communicating with the flow chamber (101), and the gate assembly (20) is movably installed in the flow chamber (101) for controlling the opening and closing of the first flow port (102) and the second flow port (103); characterized in that The gate assembly (20) includes a sealing valve head (221) and a pilot valve head (222). The sealing valve head (221) has a pilot valve cavity (201) and a first through hole (202) and a second through hole (203) communicating with the pilot valve cavity (201). The first through hole (202) communicates with the first flow port (102), and the second through hole (203) communicates with the second flow port (103). One end of the pilot valve head (222) is movably installed in the pilot valve cavity (201), and the outer wall of the pilot valve head (222) can be movably sealed with the inner wall of the pilot valve cavity (201); The electric valve has a fully closed state, and in the fully closed state, the sealing valve head (221) is blocked in one or both of the first flow port (102) and the second flow port (103), and the pilot valve head (222) is blocked in one or both of the first through hole (202) and the second through hole (203).

2. The motorized valve of claim 1, wherein, The first through hole (202) and the second through hole (203) are spaced apart in the axial direction of the pilot valve cavity (201). In the fully closed state, the pilot valve head (222) is blocked in one of the first through hole (202) and the second through hole (203), and the other of the first through hole (202) and the second through hole (203) is in communication with the pilot valve cavity (201).

3. The motorized valve of claim 2, wherein, The electric valve further includes a first sealing element (2222) and a second sealing element (2223), the first sealing element (2222) and the second sealing element (2223) are disposed between the inner wall of the pilot valve chamber (201) and the pilot valve head (222), and can respectively seal with the inner wall of the pilot valve chamber (201) and the pilot valve head (222); The electric valve also includes a valve stem (30), one end of which is connected to the gate assembly (20). Along the axial direction of the pilot valve chamber (201), the first through hole (202) is located on the side of the second through hole (203) near the valve stem (30). In the fully closed state, the projection of the first through hole (202) along its own axial direction onto the pilot valve head (222) is located between the first sealing element (2222) and the second sealing element (2223).

4. The motorized valve of claim 3, wherein, The first sealing element (2222) and the second sealing element (2223) are both installed on the outer wall of the pilot valve head (222).

5. The motorized valve of claim 1, wherein, In the fully closed state, the pilot valve head (222) is blocked in the first through hole (202) and the second through hole (203).

6. The motorized valve according to claim 2 or 5, characterized in that The chambers located at both ends of the axial direction of the pilot valve head (222) are defined as the first pilot valve chamber (2011) and the second pilot valve chamber (2012), respectively. A balance flow channel (204) is provided on the pilot valve head (222), and the two ends of the balance flow channel (204) are respectively connected to the first pilot valve chamber (2011) and the second pilot valve chamber (2012).

7. The motorized valve of claim 5, wherein, The electric valve further includes a third sealing element (2224), a fourth sealing element (2225), and a fifth sealing element (2226). The third sealing element (2224), the fourth sealing element (2225), and the fifth sealing element (2226) are disposed between the inner wall of the pilot valve chamber (201) and the pilot valve head (222), and can respectively seal with the inner wall of the pilot valve chamber (201) and the pilot valve head (222). The electric valve also includes a valve stem (30), one end of which is connected to the gate assembly (20). Along the axial direction of the pilot valve chamber (201), the first through hole (202) is located on the side of the second through hole (203) near the valve stem (30). In the fully closed state, the projection of the first through hole (202) along its own axial direction on the pilot valve head (222) is located between the third sealing element (2224) and the fourth sealing element (2225), and the projection of the second through hole (203) along its own axial direction on the pilot valve head (222) is located between the fourth sealing element (2225) and the fifth sealing element (2226).

8. The motorized valve of claim 7, wherein, The third sealing element (2224), the fourth sealing element (2225) and the fifth sealing element (2226) are all installed on the outer wall of the pilot valve head (222).

9. The electric valve according to claim 7, characterized in that, The pilot valve head (222) has a connecting cavity (205). In the fully closed state, the connecting cavity (205) is located between the fourth sealing element (2225) and the fifth sealing element (2226), or the connecting cavity (205) is located between the third sealing element (2224) and the fourth sealing element (2225). When the pilot valve head (222) moves toward the valve opening direction, the connecting cavity (205) can connect the first through hole (202) and the second through hole (203).

10. The electric valve according to claim 9, characterized in that, The outer wall of the pilot valve head (222) is recessed towards its own axis to form the communicating cavity (205).

11. The electric valve according to claim 5, characterized in that, There is a gap between the opening of the first flow port (102) and the second flow port (103) near the opening of the flow cavity (101) and the sealing valve head (221).

12. The electric valve according to claim 1, characterized in that, The inner wall of the pilot valve cavity (201) protrudes towards its own axis to form a first stop (2211), and the outer wall of the pilot valve head (222) is provided with a second stop (2221). When the pilot valve head (222) moves toward the opening direction, the second stop (2221) can abut against the first stop (2211) axially, so that the pilot valve head (222) can drive the sealing valve head (221) to move axially.

13. The electric valve according to claim 1, characterized in that, The valve body assembly (10) includes a main valve body (11), a first valve seat core (12), and a second valve seat core (13). The first valve seat core (12) and the second valve seat core (13) are installed inside the main valve body (11) and are arranged opposite to each other. When the electric valve is in the fully closed state, the first valve seat core (12) and / or the second valve seat core (13) are in a sealed fit with the gate assembly (20).

14. The electric valve according to claim 13, characterized in that, The electric valve also includes a first sealing element (14). In the fully closed state, the first sealing element (14) is disposed between the first valve seat core (12) and the gate assembly (20), and the first sealing element (14) can seal and cooperate with the first valve seat core (12) and the gate assembly (20) respectively. And / or, in the fully closed state, the first seal (14) is disposed between the second valve seat core (13) and the gate assembly (20), and the first seal (14) is capable of sealingly engaging with the second valve seat core (13) and the gate assembly (20) respectively.

15. The electric valve according to claim 14, characterized in that, The first seal (14) is installed on the first valve seat core (12) and / or the second valve seat core (13).

16. The electric valve according to claim 15, characterized in that, The electric valve further includes a second seal (15), which is installed between the first seal (14) and the first valve seat core (12) and is sealed to the first seal (14) and the first valve seat core (12) respectively; and / or, the second seal (15) is installed between the first seal (14) and the second valve seat core (13) and is sealed to the first seal (14) and the second valve seat core (13) respectively.

17. The electric valve according to claim 13, characterized in that, The side of the gate assembly (20) near the first valve seat core (12) and the second valve seat core (13) is either flat or inclined.

18. The electric valve according to claim 13, characterized in that, The first valve seat core (12) and the second valve seat core (13) are movably installed inside the main valve body (11).

19. The electric valve according to claim 18, characterized in that, The electric valve further includes a first elastic element (17) and a second elastic element (18). The two ends of the first elastic element (17) are respectively connected to the main valve body (11) and the first valve seat core (12) to apply a force to the first valve seat core (12) in the direction of approaching the gate assembly (20). The two ends of the second elastic element (18) are respectively connected to the main valve body (11) and the second valve seat core (13) to apply a force to the second valve seat core (13) in the direction of approaching the gate assembly (20).

20. The electric valve according to claim 1, characterized in that, The gate assembly (20) further includes a movable valve head (211), which is connected to one end of the pilot valve head (222), and the movable valve head (211) and the pilot valve head (222) are capable of relative displacement in a direction perpendicular to the axis of the pilot valve head (222).

21. The electric valve according to claim 20, characterized in that, The gate assembly (20) further includes a connector (23), which passes through and connects the pilot valve head (222) and the movable valve head (211) in a direction perpendicular to the axis of the pilot valve head (222). The pilot valve head (222) and the movable valve head (211) can be movably engaged through the connector (23) so that the pilot valve head (222) can move relative to the movable valve head (211) along the connector (23).

22. The electric valve according to claim 21, characterized in that, One end of the pilot valve head (222) is inserted into the movable valve head (211), and at least part of the outer wall of the pilot valve head (222) is spaced apart from the inner wall of the movable valve head (211).

23. The electric valve according to claim 20, characterized in that, The gate assembly (20) further includes a nut sleeve (212), which is disposed at the end of the movable valve head (211) away from the pilot valve head (222); The electric valve also includes a valve stem (30) and a rotor assembly (40). One end of the valve stem (30) is threaded into the nut sleeve (212), and the other end is connected to the rotor assembly (40) so that the valve stem (30) can rotate under the drive of the rotor assembly (40).

24. The electric valve according to claim 1, characterized in that, The pilot valve head (222) is cylindrical, and the pilot valve cavity (201) is adapted to the shape of the pilot valve head (222).

Images