Valve structure, gate valve and electronic expansion valve

Abstract

The invention relates to the technical field of valves, in particular to a valve structure, a gate valve and an electronic expansion valve. The valve structure comprises a valve body assembly, a rotor assembly, a valve rod and a valve element assembly, the valve element assembly is movably installed in the valve body assembly, and the rotor assembly is connected to the end, away from the valve element assembly, of the valve rod and used for driving the valve rod to rotate. The valve rod is in threaded fit with the valve element assembly so that the valve rod can drive the valve element assembly to move in the axial direction of the valve body assembly to control on-off of the valve structure. The valve structure has a full-closed state and a full-open state, and in the full-closed state, the valve rod can be matched with starting teeth of the threads on the valve element assembly in a disengaged mode. According to the valve structure, the gate valve and the electronic expansion valve, the problem that an internal thread structure and an external thread structure are blocked due to an axial stopping mode of an existing valve structure is solved.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and particularly to a valve structure, a gate valve, and an electronic expansion valve. Background Art

[0002] A valve structure is often provided in an air-conditioning system to control the fluid flow rate through the valve structure, so as to meet various usage requirements of the air-conditioning system. Among them, the valve rod and the valve core of the valve structure are in screw drive, and the rotor drives the valve rod to rotate, so that the valve rod can drive the valve core to move axially.

[0003] In the related art, the valve core in some valve structures adopts an axial stop method to realize the limit after the valve core moves to a predetermined position. However, after the valve core is axially stopped, the rotor will still drive the valve rod to continue rotating, which easily causes the increase of the internal and external thread friction force and makes the structure jam, resulting in the damage of the valve structure. Summary of the Invention

[0004] Based on this, it is necessary to provide a valve structure, a gate valve, and an electronic expansion valve to solve the problem that the existing axial stop method will cause the internal and external thread structures to jam.

[0005] The present application provides a valve structure, which includes a valve body assembly, a rotor assembly, a valve rod, and a valve core assembly. The valve core assembly is movably installed in the valve body assembly. The rotor assembly is connected to one end of the valve rod away from the valve core assembly for driving the valve rod to rotate. The valve rod is in screw fit with the valve core assembly, so that the valve rod can drive the valve core assembly to move axially along the valve body assembly to control the on-off of the valve structure. The valve structure has a fully closed state and a fully open state, and in the fully closed state, the starting teeth of the threads on the valve rod and the valve core assembly can be disengaged.

[0006] In one embodiment, in the fully open state of the valve structure, the starting teeth of the other end of the threads on the valve rod and the valve core assembly can be disengaged.

[0007] In one embodiment, a first flow port is formed in the side wall of the valve body assembly. In the fully closed state, the side wall of the valve core assembly blocks the first flow port. The valve rod includes an external thread section, and the valve core assembly includes an internal thread section. The external thread section is in screw fit with the internal thread section. Wherein, the pitch of the threads on the external thread section and the internal thread section is D, the length of the external thread section is D1, the length of the internal thread section is D2, and the diameter of the first flow port is D3. In the fully closed state, the shortest distance from the end of the valve core assembly away from the valve rod to the inner wall of the first flow port along the axial direction of the valve rod is D4, where D3 + D4 < D1 + D2 - D.

[0008] In one embodiment, the valve structure further includes an elastic member, which is disposed at one end of the valve core assembly close to the valve stem, and both ends of the elastic member are respectively connected to the valve body assembly and the valve core assembly; wherein, in the fully open state, the elastic member can apply a force to the valve core assembly to move away from the valve stem, and in the fully closed state, the elastic member can apply a force to the valve core assembly to move towards the valve stem.

[0009] In one embodiment, the valve structure further includes a first elastic assembly, which is disposed at one end of the valve core assembly close to the valve stem, and in the fully open state, the first elastic assembly can apply a force to the valve core assembly to move away from the valve stem; and / or, the valve structure further includes a second elastic assembly, which is disposed at one end of the valve core assembly away from the valve stem, and in the fully closed state, the second elastic assembly can apply a force to the valve core assembly to move towards the valve stem.

[0010] In one embodiment, the first elastic assembly includes a first elastic element and a first gasket. One end of the first elastic element is connected to the valve body assembly, and the other end is connected to the first gasket. And, in the fully open state, the valve core assembly abuts against the first gasket and compresses the first elastic element.

[0011] In one embodiment, a first abutting portion is provided on the valve body assembly. In the fully closed state, the first gasket abuts and cooperates with the first abutting portion. In the fully open state, the valve core assembly can abut against the first gasket and compress the first elastic element.

[0012] In one embodiment, the second elastic assembly includes a second elastic element and a second gasket. One end of the second elastic element is connected to the valve body assembly, and the other end is connected to the second gasket. And, in the fully closed state, the valve core assembly abuts against the second gasket and compresses the second elastic element.

[0013] In one embodiment, a second abutting portion is provided on the valve body assembly. In the fully open state, the second gasket abuts and cooperates with the second abutting portion. In the fully closed state, the valve core assembly can abut against the second gasket and compress the second elastic element.

[0014] In one embodiment, the valve body assembly is provided with a flow-through cavity and a first flow port communicating with the flow-through cavity; the valve structure further includes a first seal and a second seal. In the fully closed state, the first seal and the second seal are respectively disposed at two ends of the first flow port along the axial direction of the flow-through cavity, and both the first seal and the second seal are respectively in sealing cooperation with the inner wall of the flow-through cavity and the outer side wall of the valve core assembly, so that the valve core assembly can block the first flow port.

[0015] In one embodiment, the first seal is disposed on a side of the second seal close to the valve stem. In the fully closed state, the shortest distance from the end of the first seal on the side away from the valve stem to the inner wall of the first flow port along the axial direction of the valve body assembly is D5, and the shortest distance from the end of the second seal on the side close to the valve stem to the inner wall of the first flow port along the axial direction of the valve body assembly is D6; the valve stem includes an external thread section, the valve core assembly includes an internal thread section, the external thread section is in threaded cooperation with the internal thread section, and the pitch of the threads on the external thread section and the internal thread section is D; wherein, D5≥D, D6≥D.

[0016] In one embodiment, the valve body assembly is provided with a flow-through cavity and a first flow port communicating with the flow-through cavity; in the fully closed state, the projection of the opening at one end of the first flow port close to the flow-through cavity on the valve core assembly is always located on the valve core assembly.

[0017] In one embodiment, the valve structure further includes a rotating bearing, the rotating bearing is installed in the valve body assembly, and the outer ring of the rotating bearing is connected to the valve body assembly, and the inner ring of the rotating bearing is connected to the valve stem, so that the rotating bearing can prevent the valve stem from moving axially relative to the valve body assembly.

[0018] In one embodiment, a protruding portion is formed on the outer periphery of the valve stem, the valve structure further includes a cooperating portion, the protruding portion and the cooperating portion are respectively disposed at opposite ends of the rotating bearing along its own axial direction, and the cooperating portion is sleeved and connected to the valve stem, so that the protruding portion and the cooperating portion can cooperate to clamp the inner ring of the rotating bearing.

[0019] The present application also provides a gate valve, which includes a valve body assembly, a rotor assembly, a valve stem, and a valve core assembly. The valve core assembly is movably installed within the valve body assembly. The rotor assembly is connected to one end of the valve stem away from the valve core assembly and is used to drive the valve stem to rotate. The valve stem is in threaded engagement with the valve core assembly, so that the valve stem can drive the valve core assembly to move axially along the valve body assembly to control the opening and closing of the gate valve. The gate valve has a fully closed state and a fully open state, and in the fully closed state, the starting teeth of the threads on the valve stem and the valve core assembly can be disengaged from the threads.

[0020] The present application provides an electronic expansion valve, which includes a valve body assembly, a rotor assembly, a valve stem, a nut seat, and a valve core assembly. The valve core assembly is movably installed within the valve body assembly. The rotor assembly is connected to one end of the valve stem away from the valve core assembly and is used to drive the valve stem to rotate. The nut seat is fixedly connected to the valve body assembly, and the valve stem is in threaded engagement with the nut seat, so that the valve stem can drive the valve core assembly to move axially along the valve body assembly. The electronic expansion valve has a fully closed state and a fully open state, and in the fully closed state, the starting teeth of the threads on the valve stem and the nut seat can be disengaged from the threads.

[0021] Compared with the prior art, for the valve structure, gate valve, and electronic expansion valve provided by the present application, by disengaging the internal and external threads on the valve stem and the valve core assembly in the fully closed state, when the valve stem drives the valve core assembly to move to the fully closed position, the valve stem will not drive the valve core assembly to continue moving due to thread disengagement, thus ensuring that the valve core assembly moves in place. Therefore, a relatively stable state can be maintained between the valve stem and the valve core assembly, effectively avoiding the situation in the traditional structure where the friction force between the internal and external threads increases due to axial stop, resulting in structural jamming, thereby improving the service life of the valve structure. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a cross-sectional view (fully closed state) of the gate valve provided by an embodiment of the present application;

[0024] Figure 2 It is a cross-sectional view (fully open state) of the gate valve provided by an embodiment of the present application;

[0025] Figure 3Cross-sectional view of the gate valve according to another embodiment provided by the present application (fully closed state);

[0026] Figure 4 Cross-sectional view of the gate valve according to another embodiment provided by the present application (fully open state);

[0027] Figure 5 Cross-sectional view of the gate valve according to an embodiment provided by the present application;

[0028] Figure 6 Schematic structural diagram of the limit sleeve according to an embodiment provided by the present application;

[0029] Figure 7 Schematic structural diagram of the nut sleeve according to an embodiment provided by the present application;

[0030] Figure 8 Cross-sectional view of the gate valve according to an embodiment provided by the present application;

[0031] Figure 9 Cross-sectional view of the gate valve according to another embodiment provided by the present application;

[0032] Figure 10 Schematic structural diagram of the connecting sleeve according to an embodiment provided by the present application;

[0033] Figure 11 Cross-sectional view of the electronic expansion valve according to an embodiment provided by the present application.

[0034] The meanings of the symbols in the figure are as follows:

[0035] 100. Valve structure; 10. Valve body assembly; 101. Flow-through cavity; 1011. First cavity; 1012. Second cavity; 102. First flow port; 103. Second flow port; 104. Limit hole; 11. Valve seat; 111. First limit part; 112. First abutting part; 113. Second abutting part; 114. Main body part; 115. Connecting sleeve; 1151. Connecting boss; 12. Limit sleeve; 121. Second anti-rotation part; 122. Second limit part; 13. Bearing seat; 14. First connecting pipe; 141. First connecting part; 142. First adapter part; 15. Second connecting pipe; 151. Second connecting part; 152. Second adapter part; 20. Valve rod; 21. External thread section; 22. Rotating bearing; 23. Protruding part; 24. Fitting part; 30. Valve core assembly; 301. Balance channel; 302. First sealing groove; 303. Second sealing groove; 31. Valve head; 311. First seal; 312. Second seal; 32. Nut sleeve; 321. Internal thread section; 322. First anti-rotation part; 40. Rotor assembly; 50. Elastic part; 60. First elastic assembly; 61. First elastic element; 62. First gasket; 70. Second elastic assembly; 71. Second elastic element; 72. Second gasket; 80. Nut seat; 90. Valve port part. Detailed implementation manners

[0036] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0037] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also 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 at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0039] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0040] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0041] Please refer to Figures 1 - 11 , this application provides a valve structure 100, where the valve structure 100 can be a gate valve as shown in Figure 1 or an electronic expansion valve as shown in Figure 11 . For the convenience of description, this application specifically takes the valve structure 100 being a gate valve as an example for illustration. Among them, the valve structure 100 includes a valve body assembly 10, a valve stem 20 and a valve core assembly 30. The valve core assembly 30 is movably installed in the valve body assembly 10. One end of the valve stem 20 is connected to the valve core assembly 30 and is used to drive the valve core assembly 30 to move axially. Among them, the valve stem 20 is in threaded cooperation with the valve core assembly 30 so that the valve stem 20 can drive the valve core assembly 30 to move axially along the valve body assembly 10 to control the on-off of the valve structure 100. The valve structure 100 has a fully closed state and a fully open state. In the fully closed state, the starting teeth of the threads on the valve stem 20 and the valve core assembly 30 can be disengaged, and in the fully open state, the starting teeth of the other end of the threads on the valve stem 20 and the valve core assembly 30 can be disengaged.

[0042] Specifically, in this embodiment, as shown in Figures 1 - 4As shown, the valve stem 20 includes an external thread section 21, and the valve core assembly 30 includes an internal thread section 321. The external thread section 21 is in threaded engagement with the internal thread section 321, so as to realize the movement of the valve stem 20 driving the valve core assembly 30. And, taking the direction in which the valve core assembly 30 moves away from the valve stem 20 as the valve closing direction of the valve structure 100. Thus, in the fully closed state, the starting teeth at one end of the external thread section 21 close to the valve core assembly 30 are disengaged from the starting teeth at one end of the internal thread section 321 close to the valve stem 20, and in the fully open state, the starting teeth at the other end of the external thread section 21 are disengaged from the starting teeth at the other end of the internal thread section 321. Of course, in other embodiments, the external thread section 21 can also be provided on the valve core assembly 30, and the internal thread section 321 is provided on the valve stem 20. And, the direction in which the valve core assembly 30 moves close to the valve stem 20 can also be taken as the valve closing direction of the valve structure 100, as long as the same effect can be achieved.

[0043] It should be noted that the starting teeth of the thread in this application refer to the first complete tooth profile parts at both ends of the thread. That is, each thread has two starting teeth at the head and the tail. And, the tooth disengagement in the fully closed / fully open state means that the corresponding starting teeth at both ends of the internal and external threads are disengaged from each other.

[0044] It can be understood that in this application, by disengaging the internal and external threads on the valve stem 20 and the valve core assembly 30 in the fully closed state, when the valve stem 20 drives the valve core assembly 30 to move to the fully closed position, the valve stem 20 will not drive the valve core assembly 30 to continue moving due to tooth disengagement, thus ensuring that the valve core assembly 30 moves in place. Therefore, a relatively stable state can be maintained between the valve stem 20 and the valve core assembly 30, effectively avoiding the situation in the traditional structure where the friction force between the internal and external threads increases due to axial stop, resulting in the structure being stuck, thereby improving the service life of the valve structure 100.

[0045] That is, the valve structures 100 such as the gate valve or electronic expansion valve in this application can all realize the idling of the rotor assembly 40 through the disengagement of the internal and external threads, so as to prevent jamming, and its specific structure can be appropriately changed.

[0046] Furthermore, the valve structure 100 further includes a rotor assembly 40. The rotor assembly 40 is connected to one end of the valve stem 20 away from the valve core assembly 30 and is used to drive the valve stem 20 to rotate. That is, the valve structure 100 in this embodiment adopts electric drive, which effectively improves the convenience of opening and closing the valve compared with the traditional manual operation method. For example, the rotor assembly 40 can drive the valve stem 20 to rotate in the clockwise direction to close the valve, and drive the valve stem 20 to rotate in the counterclockwise direction to open the valve. Of course, it can also be reasonably set according to actual needs, and will not be limited too much here.

[0047] To facilitate the re-engagement of the external thread section 21 and the internal thread section 321 at the beginning of the opening and / or closing process, in one embodiment, such as Figure 1and Figure 2 As shown, the valve structure 100 further includes an elastic member 50, with the ends of the elastic member 50 respectively connected to the valve body assembly 10 and the valve core assembly 30. In the fully open state, the elastic member 50 can exert a force on the valve core assembly 30 to move it away from the valve stem 20, and / or, in the fully closed state, the elastic member 50 can exert a force on the valve core assembly 30 to move it toward the valve stem 20. In this way, the elastic member 50 not only maintains the connection between the valve stem 20 and the valve core assembly 30 when the internal and external threads are stripped, preventing them from becoming disconnected and failing, but also facilitates both upper and lower threading, reducing the difficulty of threading, allowing the internal thread segment 321 to smoothly re-thread with the external thread segment 21, ensuring that the valve stem 20 can once again drive the valve core assembly 30 to move.

[0048] Specifically, one end of the elastic member 50 can be fixedly connected to the valve body assembly 10, and the other end can be fixedly connected to the valve core assembly 30. Therefore, the axial movement of the valve core assembly 30 can affect the compression or extension of the elastic member 50, thereby generating forces in different directions. In addition, due to the presence of the elastic member 50, after the internal and external threads are stripped, the valve core assembly 30 will float up and down by a certain pitch. Taking the valve closing as an example, when the rotor assembly 40 moves toward the closing direction, after fully closing, if the valve core assembly 30 floats down by one pitch, it will still be in the stripped state. If it floats up by one pitch, the valve core assembly 30 moves upward, but at this time the rotor assembly 40 is still rotating toward the closing direction, and the valve core assembly 30 will continue to move to the position where the internal and external threads are stripped. Therefore, when fully closed, if the valve stem 20 does not change its rotation direction, the valve core assembly 30 will actually float up and down within a certain pitch range, but will eventually return to the position where the internal and external threads are stripped. When the rotor assembly 40 (ie, the valve stem 20 ) changes its rotation direction, no matter where the starting thread is, it can float toward the valve stem 20 under the action of the elastic member 50 , thereby returning to the thread-off position and re-threading.

[0049] Here, the elastic member 50 can be positioned at the end of the valve core assembly 30 closer to the valve stem 20 to reduce the impact of the fluid on the elastic member 50 and improve reliability. Of course, in other embodiments, the elastic member 50 can also be positioned at the end of the valve core assembly 30 farther from the valve stem 20, as long as the same snap-back effect is achieved.

[0050] In another embodiment, Figure 3 and Figure 4 As shown, the valve structure 100 also includes a first elastic component 60, which is arranged at one end of the valve core component 30 close to the valve stem 20. In the fully open state, the first elastic component 60 can apply a force to the valve core component 30 to move away from the valve stem 20. In this way, the internal and external threads can be rethreaded during the valve closing process, while preventing the valve stem 20 and the valve core component 30 from detaching.

[0051] Similarly, the valve structure 100 further includes a second elastic component 70. The second elastic component 70 is disposed at one end of the valve core component 30 away from the valve stem 20. In the fully closed state, the second elastic component 70 can apply a force to the valve core component 30 to move it in the direction close to the valve stem 20. In this way, the back-off of the internal and external threads can be realized during the valve opening process, and at the same time, the separation of the valve stem 20 and the valve core component 30 can be prevented.

[0052] In summary, through the cooperative action of the first elastic component 60 and the second elastic component 70, the function similar to that of the elastic component 50 can be achieved, and the back-off of the internal and external threads at the initial stage of valve opening and closing can be realized. Here, one end of the first elastic component 60 is fixedly connected to the valve body component 10, and the other end is movably connected to the valve core component 30.

[0053] As Figure 3 and Figure 4 shown, the first elastic component 60 includes a first elastic element 61 and a first gasket 62. One end of the first elastic element 61 is connected to the valve body component 10, and the other end is connected to the first gasket 62. And in the fully open state, the valve core component 30 abuts against the first gasket 62 and compresses the first elastic element 61. It is easy to understand that in this embodiment, since the valve core component 30 compresses the first elastic element 61 in the fully open state, the first elastic element 61 can apply a force to the valve core component 30 along the axial direction towards the valve closing direction through the first gasket 62, so that the starting teeth of the outer thread section 21 near one end of the rotor component 40 and the starting teeth of the inner thread section 321 away from one end of the rotor component 40 are in an active mating state, facilitating the back-off of the outer thread section 21 and the inner thread section 321 when closing the valve again. Among them, the setting of the first gasket 62 facilitates the contact and cooperation between the first elastic element 61 and the valve core component 30.

[0054] Furthermore, a first abutting portion 112 is provided on the valve body component 10. In the fully closed state, the first gasket 62 abuts and cooperates with the first abutting portion 112. In the fully open state, the valve core component 30 can abut against the first gasket 62 and compress the first elastic element 61. In this way, when the valve core component 30 disengages from the first elastic component 60, the first elastic component 60 can abut against the first abutting portion 112 to achieve support, thereby ensuring the stability of the first elastic component 60 and avoiding shaking.

[0055] As Figure 3 and Figure 4As shown in the figure, the second elastic component 70 includes a second elastic element 71 and a second gasket 72. One end of the second elastic element 71 is connected to the valve body component 10, and the other end is connected to the second gasket 72. And in the fully closed state, the valve core component 30 abuts against the second gasket 72 and compresses the second elastic element 71. It is easy to understand that in this embodiment, since the valve core component 30 compresses the second elastic element 71 in the fully closed state, the second elastic element 71 can apply a force to the valve core component 30 along the axial direction towards the valve opening direction through the second gasket 72, so that the starting tooth of the outer thread section 21 away from the rotor component 40 is in an active mating state with the starting tooth of the inner thread section 321 close to the rotor component 40, facilitating the thread return of the outer thread section 21 and the inner thread section 321 when the valve is opened again. Among them, the setting of the second gasket 72 facilitates the contact and cooperation between the second elastic element 71 and the valve core component 30.

[0056] Furthermore, a second abutting portion 113 is provided on the valve body component 10. In the fully open state, the second gasket 72 abuts and cooperates with the second abutting portion 113. In the fully closed state, the valve core component 30 can abut against the second gasket 72 and compress the second elastic element 71. In this way, when the valve core component 30 disengages from the second elastic component 70, the second elastic component 70 can abut against the second abutting portion 113 to achieve support, thereby ensuring the stability of the second elastic component 70 and avoiding shaking.

[0057] In summary, when the valve core component 30 moves in the valve closing direction, the rotor component 40 drives the valve stem 20 to rotate. The valve stem 20 drives the valve core component 30 to move axially away from the valve stem 20 through screw transmission until the valve core component 30 moves to the fully closed state position. At this time, the outer thread section 21 on the valve stem 20 is located on the side of the inner thread section 321 on the valve core component 30 close to the rotor component 40, and the starting tooth of the outer thread section 21 away from the rotor component 40 is in an active mating state with the starting tooth of the inner thread section 321 close to the rotor component 40 under the action of the elastic member 50 or the second elastic component 70.

[0058] When the valve core component 30 moves in the valve opening direction, the rotor component 40 drives the valve stem 20 to rotate in the reverse direction. The valve stem 20 drives the valve core component 30 to move axially towards the valve stem 20 through screw transmission until the valve core component 30 moves to the fully open state position. At this time, the outer thread section 21 on the valve stem 20 is located on the side of the inner thread section 321 on the valve core component 30 away from the rotor component 40, and the starting tooth of the outer thread section 21 close to the rotor component 40 is in an active mating state with the starting tooth of the inner thread section 321 away from the rotor component 40 under the action of the elastic member 50 or the first elastic component 60.

[0059] In one embodiment, the valve body assembly 10 is provided with a flow passage chamber 101, a first flow port 102 and a second flow port 103 that communicate with the flow passage chamber 101. The valve core assembly 30 is movably installed in the flow passage chamber 101, and both the first flow port 102 and the second flow port 103 are provided on the side wall of the valve body assembly 10. Moreover, when the valve structure 100 is in the fully open state, the first flow port 102 and the second flow port 103 can be communicated through the flow passage chamber 101. When the valve structure 100 is in the fully closed state, the valve core assembly 30 can cut off the flow of fluid between the first flow port 102 and the second flow port 103. Among them, the valve structure 100 further includes a first connecting pipe 14 and a second connecting pipe 15. The first connecting pipe 14 is inserted into the first flow port 102 and communicates with the flow passage chamber 101, and the second connecting pipe 15 is inserted into the second flow port 103 and communicates with the flow passage chamber 101.

[0060] It should be noted here that the valve structure 100 of the present application can have flow or no flow in the fully closed state. For example, when there is no flow passing between the first flow port 102 and the second flow port 103, at this time, the valve structure 100 can be a gate valve or an electronic expansion valve. Of course, there can also be a certain amount of flow passing between the first flow port 102 and the second flow port 103. At this time, the second elastic component 70 or the elastic component 50 can apply a force to the valve core assembly 30, so that a flow gap (flow groove, etc.) is formed between the valve core assembly 30 and the valve body assembly 10, thereby allowing a certain amount of flow to pass through, so that it can be used for, such as Figure 11 the electronic expansion valve shown. Specifically, when the valve structure 100 is an electronic expansion valve, as Figure 11 shown, the electronic expansion valve may further include a nut seat 80. The nut seat 80 is fixedly connected to the valve body assembly 10, and the valve stem 20 is in threaded cooperation with the nut seat 80, so that the valve stem 20 can drive the valve core assembly 30 to move along the axial direction of the valve body assembly 10. That is to say, the valve stem 20 of the electronic expansion valve can be in threaded cooperation with the nut seat 80 fixed on the valve body assembly 10 and then connected to the valve core assembly 30, rather than directly in threaded cooperation with the valve core assembly 30. Based on this, in the fully closed state of the electronic expansion valve, the starting teeth of the thread on the valve stem 20 and the nut seat 80 can be disengaged, so as to achieve an anti-jamming effect similar to that of the above-mentioned gate valve. Among them, when there is no flow passing through in the fully closed state of the electronic expansion valve, the valve core assembly 30 can abut against the valve port part 90 of the electronic expansion valve. When there is flow passing through in the fully closed state of the electronic expansion valve, the valve core assembly 30 abuts against the valve port part 90, and a flow gap (flow groove, etc.) is provided on the valve port part 90 or the valve core assembly 30 to achieve the passage of a certain amount of fluid when fully closed.

[0061] Further, an elastic member 50 that functions as a back-off thread can be disposed between the nut seat 80 and the valve core assembly 30 of the electronic expansion valve, and can be reasonably set according to actual needs. At the same time, the flow rate in the fully closed state can also be controlled by the elastic member 50. For example, by applying a force to the valve core assembly 30 through the elastic member 50, a gap is formed between the end of the valve core assembly 30 and the valve port portion 90, so as to allow a certain amount of fluid to pass through when fully closed.

[0062] In one embodiment, as Figures 1 - 4 and Figure 8 and Figure 9 shown, the first flow port 102 and the second flow port 103 are arranged at intervals in the axial direction of the valve body assembly 10, and in the fully closed state, the valve core assembly 30 blocks one of the first flow port 102 and the second flow port 103, and the other of the first flow port 102 and the second flow port 103 is communicated with the flow cavity 101. By arranging the two flow ports at intervals, when the valve core assembly 30 closes one of the flow ports, the entire flow channel can be cut off. At the same time, the other flow port can remain communicated with the flow cavity 101. In this way, it is beneficial to maintain the internal balance of the valve structure 100 in the closed valve state.

[0063] Specifically, in the traditional direct-through structure, when the valve structure 100 is closed, the fluid pressures at the flow ports on both sides of the valve core assembly 30 are different. The high-pressure side will press the valve core assembly 30 to the low-pressure side, resulting in an increase in the friction between the valve core assembly 30 and the inner wall of the flow cavity 101, thereby increasing the difficulty of opening the valve for the valve core assembly 30. In the present application, during the axial movement of the valve core assembly 30, the outer wall of the valve core assembly 30 and the inner wall of the flow cavity 101 are in movable sealing cooperation. Therefore, the valve core assembly 30 will divide the flow cavity 101 into two relatively independent cavities. And since the two flow ports are axially offset, in the fully closed state, that is, when the valve structure 100 closes one of the flow ports, the other can still communicate with one of the above two cavities. Here, the parts of the flow cavity 101 located on the opposite sides of the valve core assembly 30 along the axis can be defined as the first cavity 1011 and the second cavity 1012 respectively. At this time, only processing the valve core assembly 30 can achieve the pressure balance between the first cavity 1011 and the second cavity 1012 on both sides of the valve core assembly 30 without affecting the sealing effect between the valve core assembly 30 and the inner wall of the flow cavity 101. For example, a balance channel 301 is opened on the valve core assembly 30, and both ends of the balance channel 301 communicate with the first cavity 1011 and the second cavity 1012 respectively. That is, in the fully closed state, the valve core assembly 30 blocks one of the first flow port 102 and the second flow port 103, and the other of the first flow port 102 and the second flow port 103 communicates with the balance channel 301. In this way, the pressure balance between the first cavity 1011 and the second cavity 1012 in the fully closed state of the valve structure 100 is achieved, thereby greatly reducing the difficulty of axially moving the valve core assembly 30 to open the valve.

[0064] For the convenience of description, in the present application, one of the two cavities formed by dividing the flow cavity 101 and close to the valve stem 20 is defined as the first cavity 1011, and the other cavity far from the valve stem 20 is defined as the second cavity 1012. That is, the first cavity 1011 is located on the side of the second cavity 1012 close to the valve stem 20.

[0065] Further, the valve structure 100 further includes a first seal 311 and a second seal 312. And in the fully closed state, the first seal 311 and the second seal 312 are respectively arranged at both ends of the first flow port 102 or the second flow port 103 along the axis of the flow cavity 101, and both the first seal 311 and the second seal 312 are respectively in sealing cooperation with the inner wall of the flow cavity 101 and the outer side wall of the valve core assembly 30, so that the valve core assembly 30 can block one of the first flow port 102 and the second flow port 103.

[0066] It should be noted that the fact that the first seal 311 and the second seal 312 are respectively in sealing cooperation with the inner wall of the flow passage chamber 101 and the outer wall of the valve core assembly 30 means that fluid will not enter the first chamber 1011 and the second chamber 1012 through the gap between the inner wall of the flow passage chamber 101 and the outer wall of the valve core assembly 30.

[0067] It can be understood that with such an arrangement, the cooperation of the first seal 311 and the second seal 312 can completely cut off the flow path between the first flow port 102 and the second flow port 103 in the fully closed state, preventing internal leakage from occurring when the valve structure 100 is closed. At the same time, since the first flow port 102 and the second flow port 103 are arranged in a staggered manner, it is easier to machine the valve core assembly 30 to achieve internal balance of the valve structure 100 in the valve-closed state, thereby reducing the difficulty of opening the valve structure 100.

[0068] Similarly, for the convenience of description, in the present application, one of the two flow ports that is axially closer to the valve stem 20 is defined as the first flow port 102, and the other flow port that is far from the valve stem 20 is defined as the second flow port 103. That is, along the axial direction of the flow passage chamber 101, the first flow port 102 is located on the side of the second flow port 103 closer to the valve stem 20.

[0069] Based on this, in the fully closed state, the side wall of the valve core assembly 30 can be set to block the first flow port 102 to reduce the length of the valve stem 20 and / or the valve core assembly 30, which is beneficial to reducing the cost of the valve structure 100. And, taking the side wall of the valve core assembly 30 blocking the first flow port 102 in the fully closed state as an example, at this time, the projection of the opening at one end of the first flow port 102 close to the flow passage chamber 101 on the valve core assembly 30 along its own axis is located between the first seal 311 and the second seal 312. In this way, the cooperation of the first seal 311 and the second seal 312 can completely cut off the flow path between the first flow port 102 and the second flow port 103 in the fully closed state, that is, the fluid in the first chamber 1011 and the second chamber 1012 will not communicate with the first flow port 102, preventing internal leakage. At the same time, the second flow port 103 can be communicated with the first chamber 1011 through the second chamber 1012 and the balance channel 301, so as to achieve pressure balance at both ends of the valve core assembly 30.

[0070] Furthermore, the first seal 311 and the second seal 312 are arranged in parallel, that is, the first seal 311 and the second seal 312 can be two parallel arranged sealing rings, with a simple structure and convenient installation.

[0071] Optionally, the first seal 311 and the second seal 312 can be installed on the valve core assembly 30. For example, as Figure 1As shown, the outer sidewall of the valve core assembly 30 is provided with a first sealing groove 302 and a second sealing groove 303 that are recessed toward the direction close to its own axis. The first seal 311 is installed in the first sealing groove 302, and the second seal 312 is installed in the second sealing groove 303. In this way, the installation strength of the first seal 311 and the second seal 312 on the valve core assembly 30 can be improved, and the first seal 311 and the second seal 312 can move with the movement of the valve core assembly 30, meeting the sealing requirements of the valve core assembly 30 during movement or in the fully closed state. Thus, there is no need to additionally set seals, and the cost is lower.

[0072] Of course, the first seal 311 and the second seal 312 can also be installed on the inner wall of the flow passage chamber 101. For example, the inner wall of the flow passage chamber 101 is recessed to form a first sealing groove 302 and a second sealing groove 303. The first sealing groove 302 and the second sealing groove 303 are respectively arranged at both ends of the first flow port 102 or the second flow port 103 along the axial direction of the flow passage chamber 101. And the first seal 311 is installed in the first sealing groove 302, and the second seal 312 is installed in the second sealing groove 303. In this way, the sealing effect in the fully closed state can also be achieved.

[0073] For the convenience of description, the present application only takes the first seal 311 and the second seal 312 installed on the valve core assembly 30 as an example for illustration. Similarly, for the convenience of description, here one of the two seals that is axially closer to the valve stem 20 can be defined as the first seal 311, and the seal that is farther from the valve stem 20 is defined as the second seal 312. That is, the first seal 311 is arranged on the side of the second seal 312 close to the valve stem 20.

[0074] In other embodiments, the first seal 311 and the second seal 312 may not be provided. Only by setting that in the fully closed state, the projection of the opening at one end of the first flow port 102 close to the flow passage chamber 101 on the valve core assembly 30 is always located on the valve core assembly 30, that is, directly realizing sealing through the cooperation of the outer wall of the valve core assembly 30 and the inner wall of the flow passage chamber 101. In this way, it can be ensured that during the process of the valve core assembly 30 floating by one pitch, reliable sealing of the first flow port 102 can be maintained.

[0075] To ensure that the two flow ports can be fully communicated when the valve structure 100 is fully open, in one embodiment, such as Figure 1 and Figure 3As shown, the pitch of the threads on the external thread section 21 and the internal thread section 321 is D, the length of the external thread section 21 is D1, the length of the internal thread section 321 is D2, the diameter of the first flow port 102 is D3. In the fully closed state, the shortest distance from the end of the valve element assembly 30 away from the valve stem 20 along the axial direction of the valve stem 20 to the inner wall of the first flow port 102 is D4. Among them, D3 + D4 < D1 + D2 - D. It is easy to understand that the distance that the valve element assembly 30 moves from the fully closed state to the fully open state is at least the sum of the lengths of the two thread sections, and D3 + D4 is the distance that the valve element assembly 30 needs to move at least to fully open the first flow port 102 during the valve opening process. Therefore, by setting D3 + D4 < D1 + D2 - D, it can be ensured that when the valve element assembly 30 moves to the fully open state position, even if the valve element assembly 30 floats relative to the valve stem 20 by one pitch, the valve element assembly 30 will not block the first flow port 102, thereby improving the fluid flow performance.

[0076] Furthermore, as Figure 1 and Figure 3 shown, in the fully closed state, the shortest distance from the end of the first seal 311 on the side away from the valve stem 20 along the axial direction of the valve body assembly 10 to the inner wall of the first flow port 102 is D5, and the shortest distance from the end of the second seal 312 on the side close to the valve stem 20 along the axial direction of the valve body assembly 10 to the inner wall of the first flow port 102 is D6. The pitch of the threads on the external thread section 21 and the internal thread section 321 is D. Among them, D5 ≥ D, D6 ≥ D. In this way, the error caused by the thread pitch can be eliminated, and it can be ensured that in the fully closed state, the first seal 311 and the second seal 312 can effectively seal the first flow port 102.

[0077] In one embodiment, as Figure 1 and Figure 7 shown, the valve element assembly 30 includes a valve head 31 and a nut sleeve 32. The nut sleeve 32 is arranged at one end of the valve head 31. Here, the valve head 31 and the nut sleeve 32 can be an integral or split structure. Among them, the internal thread section 321 is arranged on the nut sleeve 32, and the end of the valve stem 20 away from the rotor assembly 40 is inserted into the nut sleeve 32 and is threadedly connected with the nut sleeve 32, so that the valve stem 20 can drive the valve element assembly 30 to move axially. And when the valve head 31 and the nut sleeve 32 are arranged separately, it is convenient for the processing of the valve head 31 and the nut sleeve 32, and the processing difficulty can be reduced.

[0078] Specifically, in this embodiment, the balance channel 301, the first seal groove 302 and the second seal groove 303 can all be opened on the valve head 31, that is, the valve head 31 divides the flow cavity 101 into a first cavity 1011 and a second cavity 1012 located at both ends of the valve head 31.

[0079] Furthermore, as Figures 1 - 5 andFigure 7 As shown, a limiting hole 104 communicating with the flow-through cavity 101 is further formed in the valve body assembly 10. One end of the nut sleeve 32 away from the valve head 31 is movably inserted into the limiting hole 104. The valve rod 20 passes through the limiting hole 104 and is threadedly connected to the nut sleeve 32, and is used to drive the valve core assembly 30 to move axially to control the on-off of the valve structure 100. Wherein, a rotation prevention structure is provided between the nut sleeve 32 and the limiting hole 104 to prevent the nut sleeve 32 from rotating relative to the limiting hole 104.

[0080] It can be understood that by providing the rotation prevention structure, the rotation prevention of the nut sleeve 32 and the limiting hole 104 can be realized, ensuring that the nut sleeve 32 can only move axially during the valve opening and closing processes without circumferential rotation. In this way, the rotation of the valve core assembly 30 can be effectively prevented, thereby reducing the friction generated between the valve core assembly 30 and the inner wall of the flow-through cavity 101. This can not only reduce friction and wear and extend the service life of the components, but also reduce friction noise, thereby improving the use experience of the valve structure 100.

[0081] Specifically, in this embodiment, a first rotation prevention portion 322 is provided on the outer side wall of the nut sleeve 32, and a second rotation prevention portion 121 is provided on the inner wall of the limiting hole 104. The first rotation prevention portion 322 and the second rotation prevention portion 121 are in limiting cooperation, that is, the rotation prevention structure includes the first rotation prevention portion 322 provided on the outer side wall of the nut sleeve 32 and the second rotation prevention portion 121 provided on the inner wall of the limiting hole 104. Wherein, both the first rotation prevention portion 322 and the second rotation prevention portion 121 can be configured as rotation prevention surfaces. Here, the rotation prevention surface can adopt a planar structure, and the rotation prevention effect is better. Of course, it can also be set as a curved surface structure with a certain radian, etc. Of course, in other embodiments, the rotation prevention structure can also adopt structures such as protrusions and chutes that can achieve circumferential anti-rotation, and will not be limited too much here.

[0082] Furthermore, the number of the first rotation prevention portions 322 is multiple, and the multiple first rotation prevention portions 322 are spaced apart on the outer side wall of the nut sleeve 32. Wherein, the number of the second rotation prevention portions 121 and the first rotation prevention portions 322 are set in one-to-one correspondence. In this way, the circumferential rotation of the nut sleeve 32 can be further prevented, ensuring the stability of the axial movement of the valve core assembly 30.

[0083] In this embodiment, the number of the first rotation prevention portions 322 is two, and the two first rotation prevention portions 322 are provided on the opposite side walls of the nut sleeve 32 along its own radial direction. Of course, in other embodiments, the first rotation prevention portions 322 can also be set to three, four, etc. according to actual needs, as long as the same effect can be achieved.

[0084] For the convenience of machining the limiting hole 104, in one embodiment, as Figure 5 and Figure 6As shown, the valve body assembly 10 includes a valve seat 11 and a limit sleeve 12. The limit sleeve 12 is disposed at one end of the valve seat 11 and fixedly connected to the valve seat 11. Among them, a limit hole 104 is formed in the limit sleeve 12. In this way, by separately arranging the valve seat 11 and the limit sleeve 12, the limit sleeve 12 can be processed independently, thereby improving the processing accuracy of the limit sleeve 12 and reducing the processing difficulty. In addition, the valve seat 11 and the limit sleeve 12 can also be of an integral structure.

[0085] Further, as Figure 5 and Figure 6 shown, a first limit portion 111 is provided on the valve seat 11, and a second limit portion 122 is provided on the limit sleeve 12. The first limit portion 111 and the second limit portion 122 are cooperatively connected to prevent the limit sleeve 12 from rotating relative to the valve seat 11. In this way, the resistance of the limit sleeve 12 to rotate relative to the valve seat 11 can be increased, the anti-rotation effect between the valve seat 11 and the limit sleeve 12 can be achieved, and further ensure that the limit sleeve 12 can apply sufficient force to the nut sleeve 32, ensuring that the nut sleeve 32 will not cause the nut sleeve 32 and the limit sleeve 12 to rotate together when moving along the limit hole 104, thereby improving the reliability of the overall structure.

[0086] Specifically, as Figure 6 and Figure 10 shown, the valve seat 11 includes a main body portion 114 and a connecting sleeve 115. The connecting sleeve 115 is disposed at one end of the main body portion 114 and fixedly connected to the main body portion 114. A connecting boss 1151 protrudes from the inner wall of the connecting sleeve 115. One end of the limit sleeve 12 is inserted and installed on the connecting boss 1151. The first limit portion 111 is provided on the inner wall of the connecting boss 1151, and the second limit portion 122 is provided on the outer wall of the limit sleeve 12. And one of the first limit portion 111 and the second limit portion 122 is configured as a limit protrusion, and the other is configured as a limit groove. The limit protrusion is inserted into the limit groove to prevent the limit sleeve 12 from rotating relative to the valve seat 11. In this way, the circumferential anti-rotation effect of the valve seat 11 on the limit sleeve 12 can be ensured.

[0087] In an embodiment, the nut sleeve 32 and / or the limit sleeve 12 are configured as plastic material parts. The plastic material has a high surface finish and small friction, which can reduce the frictional resistance between the nut sleeve 32 and the limit sleeve 12.

[0088] Since in this embodiment, the valve stem 20 drives the valve core assembly 30 to move, and the opening and closing functions are realized through the axial movement of the valve core assembly 30. Therefore, in order to improve the reliability of the cooperation between the valve stem 20 and the valve core assembly 30, the axial position of the valve stem 20 relative to the valve body assembly 10 can be set to remain unchanged. Based on this, in one embodiment, the valve structure 100 further includes a rotating bearing 22. The rotating bearing 22 is installed in the valve body assembly 10, and the outer ring of the rotating bearing 22 is connected to the valve body assembly 10, and the inner ring of the rotating bearing 22 is connected to the valve stem 20, so that the rotating bearing 22 can prevent the valve stem 20 from moving axially relative to the valve body assembly 10. It is easy to understand that the valve stem 20 not only realizes the connection and axial limit with the valve body assembly 10 through the rotating bearing 22, but also can reduce the resistance when the valve stem 20 rotates circumferentially, and the reliability is higher. Moreover, the valve stem 20 can only rotate circumferentially through the rotating bearing 22 and remains stationary axially, while the nut sleeve 32 is kept from rotating circumferentially by the limit sleeve 12. Therefore, the nut sleeve 32 can only move axially under the drive of the thread of the valve stem 20.

[0089] To further reduce the probability of the valve stem 20 moving axially, a convex portion 23 is formed on the outer periphery of the valve stem 20. The valve structure 100 further includes a mating portion 24. The convex portion 23 and the mating portion 24 are respectively provided at opposite ends of the rotating bearing 22 along its own axis, and the mating portion 24 is sleeved and connected to the valve stem 20, so that the convex portion 23 and the mating portion 24 can cooperate to clamp the inner ring of the rotating bearing 22. In this way, through the connection between the mating portion 24 and the valve stem 20, and in combination with the convex portion 23 formed on the valve stem 20, the strength of the connection between the valve stem 20 and the rotating bearing 22 can be effectively improved, avoiding the axial movement of the valve stem 20, and the overall structure is more reliable.

[0090] Specifically, the valve body assembly 10 further includes a bearing seat 13. The bearing seat 13 is sleeved on the outer periphery of the limit sleeve 12 and is respectively connected to the valve seat 11 and the limit sleeve 12 to prevent the limit sleeve 12 from moving axially relative to the valve seat 11. Optionally, the bearing seat 13 can be connected to the connecting sleeve 115 on the valve seat 11, and the axial limit of the limit sleeve 12 can be realized by cooperating with the connecting boss 1151 on the connecting sleeve 115 using its own end and / or the stepped hole inside. Among them, the rotating bearing 22 is installed in the bearing seat 13, and the outer ring of the rotating bearing 22 is fixedly connected to the bearing seat 13, and the inner ring of the rotating bearing 22 is connected to the valve stem 20, so that the rotating bearing 22 can prevent the valve stem 20 from moving axially. In this way, it is convenient to install the rotating bearing 22.

[0091] In one embodiment, as Figure 8 and Figure 9As shown, the first flow port 102 and the second flow port 103 are opened on opposite sides in the radial direction of the valve body assembly 10. And since the first connection pipe 14 is connected to the first flow port 102 and the second connection pipe 15 is connected to the second flow port 103, that is to say, the first connection pipe 14 and the second connection pipe 15 are respectively connected to opposite sides in the radial direction of the valve body assembly 10. Among them, the end of the first connection pipe 14 away from the valve body assembly 10 is coaxially arranged with the end of the second connection pipe 15 away from the valve body assembly 10.

[0092] It can be understood that after the first connection pipe 14 and the second connection pipe 15 are connected to the valve body assembly 10, the ends of the two connected to the external pipeline can be located on the same straight line. In this way, it is convenient to determine the installation position of the valve structure 100, which is beneficial to improving the installation efficiency of the valve structure 100 and reducing the installation difficulty. For example, when there is a gap between the first flow port 102 and the second flow port 103 in the axial direction, during the installation process, only the installation angle of the valve body assembly 10 needs to be appropriately adjusted so that the two connection pipes on both sides can be flush with the system pipeline to complete the installation.

[0093] Furthermore, the end of the first connection pipe 14 close to the valve body assembly 10 and the end of the second connection pipe 15 close to the valve body assembly 10 are spaced apart in the axial direction of the valve body assembly 10. That is, the first flow port 102 and the second flow port 103 are spaced apart in the axial direction of the valve body assembly 10. In this way, the present application is beneficial to maintaining the internal balance of the valve structure 100 in the closed valve state.

[0094] In an embodiment, as Figure 8 shown, the first connection pipe 14 is configured as a straight pipe, and the axis of the first connection pipe 14 forms an angle with the axis of the valve body assembly 10. At the same time, the second connection pipe 15 is also configured as a straight pipe, and the axis of the second connection pipe 15 forms an angle with the axis of the valve body assembly 10. In this way, the structures of the first connection pipe 14 and the second connection pipe 15 are simple and easy to process.

[0095] In another embodiment, as Figure 9As shown in the figure, the first connecting pipe 14 includes a first connecting portion 141 and a first adapter portion 142. One end of the first adapter portion 142 is connected to the valve body assembly 10. The first connecting portion 141 is provided at the end of the first adapter portion 142 away from the valve body assembly 10, and the first connecting portion 141 and the first adapter portion 142 are directly or indirectly connected. Among them, there is a bend between the first adapter portion 142 and the first connecting portion 141. At the same time, the second connecting pipe 15 includes a second connecting portion 151 and a second adapter portion 152. One end of the second adapter portion 152 is connected to the valve body assembly 10. The second connecting portion 151 is provided at the end of the second adapter portion 152 away from the valve body assembly 10, and the second connecting portion 151 and the second adapter portion 152 are directly or indirectly connected. Among them, there is a bend between the second adapter portion 152 and the second connecting portion 151. In this way, the settings of the first connecting pipe 14 and the second connecting pipe 15 are more flexible, and the included angles between the first adapter portion 142 and the first connecting portion 141, and between the second adapter portion 152 and the second connecting portion 151 can be adjusted according to actual needs, so as to facilitate the processing of the first flow port 102 and the second flow port 103. Among them, the bend between the first connecting portion 141 and the first adapter portion 142, and the bend between the second connecting portion 151 and the second adapter portion 152 can be set to one or more, and can be reasonably set according to actual needs.

[0096] Specifically, in this embodiment, the first connecting portion 141 and the second connecting portion 151 are used to connect to the system pipeline, and the first connecting portion 141 and the second connecting portion 151 are located on the same axis. In this way, it is convenient for the first connecting portion 141 and the second connecting portion 151 to be connected to the external system pipeline, and the installation difficulty is reduced.

[0097] Furthermore, the axis of the first adapter portion 142 can be set perpendicular to the axis of the valve body assembly 10. At the same time, the axis of the second adapter portion 152 can be set perpendicular to the axis of the valve body assembly 10. In this way, the first flow port 102 and the second flow port 103 can also be set perpendicular to the axis of the valve body assembly 10, which is beneficial to improving the processing efficiency and reducing the processing difficulty.

[0098] However, it is not limited to this. In other embodiments, the first connecting pipe 14 can also be configured as a straight pipe, and the second connecting pipe 15 can be configured as a structure in which the second connecting portion 151 and the second adapter portion 152 are arranged at an included angle and connected to each other. Of course, the first connecting pipe 14 can also be configured as a structure in which the first connecting portion 141 and the first adapter portion 142 are arranged at an included angle and connected to each other, and the second connecting pipe 15 can be configured as a straight pipe, as long as it can be ensured that after the first connecting pipe 14 and the second connecting pipe 15 are connected to the valve body assembly 10, the ends of the two connected to the external pipeline can be located on the same straight line.

[0099] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0100] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A valve structure, characterized in that, It includes a valve body assembly (10), a rotor assembly (40), a valve stem (20), and a valve core assembly (30). The valve core assembly (30) is movably installed inside the valve body assembly (10). The rotor assembly (40) is connected to one end of the valve stem (20) away from the valve core assembly (30) and is used to drive the valve stem (20) to rotate. The valve stem (20) is in threaded cooperation with the valve core assembly (30) so that the valve stem (20) can drive the valve core assembly (30) to move axially along the valve body assembly (10) to control the on-off of the valve structure. The valve structure has a fully closed state and a fully open state. In the fully closed state, the starting teeth of the threads on the valve stem (20) and the valve core assembly (30) can be disengaged.

2. The valve structure according to claim 1, characterized in that, In the fully open state of the valve structure, the starting teeth of the other end of the threads on the valve stem (20) and the valve core assembly (30) can be disengaged.

3. The valve structure according to claim 2, wherein, A first flow port (102) is formed in the side wall of the valve body assembly (10). In the fully closed state, the side wall of the valve core assembly (30) blocks the first flow port (102). The valve stem (20) includes an external thread section (21), and the valve core assembly (30) includes an internal thread section (321). The external thread section (21) is in threaded cooperation with the internal thread section (321). The pitch of the threads on the external thread section (21) and the internal thread section (321) is D. The length of the external thread section (21) is D1, the length of the internal thread section (321) is D2, and the diameter of the first flow port (102) is D3. In the fully closed state, the shortest distance from the end of the valve core assembly (30) away from the valve stem (20) along the axis of the valve stem (20) to the inner wall of the first flow port (102) is D4. Wherein, D3 + D4 < D1 + D2 - D.

4. The valve structure according to claim 1 or 2, characterized in that The valve structure further includes an elastic member (50). The elastic member (50) is disposed at one end of the valve core assembly (30) close to the valve stem (20), and both ends of the elastic member (50) are respectively connected to the valve body assembly (10) and the valve core assembly (30). Wherein, in the fully open state, the elastic member (50) can apply a force to the valve core assembly (30) to move away from the valve stem (20). In the fully closed state, the elastic member (50) can apply a force to the valve core assembly (30) to move towards the valve stem (20).

5. The valve structure according to claim 1 or 2, characterized in that, The valve structure further includes a first elastic assembly (60). The first elastic assembly (60) is disposed at one end of the valve core assembly (30) close to the valve stem (20). In the fully open state, the first elastic assembly (60) can apply a force to the valve core assembly (30) to move away from the valve stem (20). And / or, the valve structure further includes a second elastic component (70), the second elastic component (70) is disposed at one end of the valve core component (30) away from the valve stem (20), and in the fully closed state, the second elastic component (70) can apply a force to the valve core component (30) to move it in a direction close to the valve stem (20).

6. The valve structure according to claim 5, characterized in that The first elastic component (60) includes a first elastic element (61) and a first gasket (62), one end of the first elastic element (61) is connected to the valve body component (10), and the other end is connected to the first gasket (62). Moreover, in the fully open state, the valve core component (30) abuts against the first gasket (62) and compresses the first elastic element (61).

7. The valve structure according to claim 6, characterized in that, The valve body component (10) is provided with a first abutting portion (112). In the fully closed state, the first gasket (62) abuts and cooperates with the first abutting portion (112). In the fully open state, the valve core component (30) can abut against the first gasket (62) and compress the first elastic element (61).

8. The valve structure according to claim 5, characterized in that, The second elastic component (70) includes a second elastic element (71) and a second gasket (72), one end of the second elastic element (71) is connected to the valve body component (10), and the other end is connected to the second gasket (72). Moreover, in the fully closed state, the valve core component (30) abuts against the second gasket (72) and compresses the second elastic element (71).

9. The valve structure according to claim 8, wherein, The valve body component (10) is provided with a second abutting portion (113). In the fully open state, the second gasket (72) abuts and cooperates with the second abutting portion (113). In the fully closed state, the valve core component (30) can abut against the second gasket (72) and compress the second elastic element (71).

10. The valve structure according to claim 1, characterized in that, The valve body component (10) is provided with a flow-through cavity (101) and a first flow port (102) communicating with the flow-through cavity (101); The valve structure further includes a first seal (311) and a second seal (312). In the fully closed state, the first seal (311) and the second seal (312) are respectively disposed at both ends of the first flow port (102) along the axial direction of the flow-through cavity (101), and both the first seal (311) and the second seal (312) are respectively in sealing cooperation with the inner wall of the flow-through cavity (101) and the outer wall of the valve core component (30), so that the valve core component (30) can block the first flow port (102).

11. The valve structure according to claim 10, wherein, The first seal (311) is arranged on one side of the second seal (312) close to the valve stem (20). In the fully closed state, the shortest distance from the end of the first seal (311) on the side away from the valve stem (20) to the inner wall of the first flow port (102) along the axial direction of the valve body assembly (10) is D5, and the shortest distance from the end of the second seal (312) on the side close to the valve stem (20) to the inner wall of the first flow port (102) along the axial direction of the valve body assembly (10) is D6; The valve stem (20) includes an external thread section (21), and the valve core assembly (30) includes an internal thread section (321). The external thread section (21) is in threaded cooperation with the internal thread section (321), and the pitch of the threads on the external thread section (21) and the internal thread section (321) is D; Wherein, D5≥D, D6≥D.

12. The valve structure according to claim 1, wherein, The valve body assembly (10) is provided with a flow cavity (101) and a first flow port (102) communicating with the flow cavity (101); In the fully closed state, the projection of the opening at one end of the first flow port (102) close to the flow cavity (101) on the valve core assembly (30) is always located on the valve core assembly (30).

13. The valve structure according to claim 1, characterized in that, The valve structure further includes a rotating bearing (22). The rotating bearing (22) is installed in the valve body assembly (10), and the outer ring of the rotating bearing (22) is connected to the valve body assembly (10), and the inner ring of the rotating bearing (22) is connected to the valve stem (20), so that the rotating bearing (22) can prevent the valve stem (20) from moving axially relative to the valve body assembly (10).

14. The valve structure according to claim 13, characterized in that, A convex portion (23) protrudes from the outer periphery of the valve stem (20). The valve structure further includes a cooperating portion (24). The convex portion (23) and the cooperating portion (24) are respectively arranged at opposite ends of the rotating bearing (22) along its own axial direction, and the cooperating portion (24) is sleeved and connected to the valve stem (20), so that the convex portion (23) and the cooperating portion (24) can cooperate to clamp the inner ring of the rotating bearing (22).

15. A gate valve, characterized in that, It includes a valve body assembly (10), a rotor assembly (40), a valve stem (20) and a valve core assembly (30). The valve core assembly (30) is movably installed in the valve body assembly (10). The rotor assembly (40) is connected to one end of the valve stem (20) away from the valve core assembly (30) for driving the valve stem (20) to rotate. The valve stem (20) is in threaded cooperation with the valve core assembly (30), so that the valve stem (20) can drive the valve core assembly (30) to move axially along the valve body assembly (10) to control the on-off of the gate valve; The gate valve has a fully closed state and a fully open state. In the fully closed state, the starting teeth of the threads on the valve stem (20) and the valve core assembly (30) can be disengaged and mated.

16. An electronic expansion valve, characterized in that, It includes a valve body assembly (10), a rotor assembly (40), a valve stem (20), a nut seat (80) and a valve core assembly (30). The valve core assembly (30) is movably installed in the valve body assembly (10). The rotor assembly (40) is connected to one end of the valve stem (20) away from the valve core assembly (30) and is used to drive the valve stem (20) to rotate; The nut seat (80) is fixedly connected to the valve body assembly (10), and the valve stem (20) is in threaded cooperation with the nut seat (80) so that the valve stem (20) can drive the valve core assembly (30) to move axially along the valve body assembly (10); The electronic expansion valve has a fully closed state and a fully open state, and in the fully closed state, the starting teeth of the threads on the valve stem (20) and the nut seat (80) can be disengaged.

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