Valve structure, gate valve and electronic expansion valve

Abstract

The utility model 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

Valve structure, gate valve and electronic expansion valve Technical Field

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

[0002] Air conditioning systems often incorporate valve structures to control fluid flow and meet various operational requirements. In these valve structures, the valve stem and valve core are connected by a threaded drive, and the rotor drives the valve stem to rotate, enabling the valve stem to move the valve core axially.

[0003] In related technologies, some valve structures use axial stops to limit the valve core after it moves to a predetermined position. However, after the valve core is stopped axially, the rotor will still drive the valve stem to continue rotating. This can easily lead to increased friction between the internal and external threads, causing the structure to jam and resulting in damage to the valve structure. Summary of the Invention

[0004] Therefore, it is necessary to provide a valve structure, gate valve, and electronic expansion valve to solve the problem that existing axial stop methods can cause the internal and external thread structures to jam.

[0005] This application provides a valve structure including 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 the 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 threadedly engaged 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 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 stem and the valve core assembly can disengage.

[0006] In one embodiment, in the fully open state, the valve structure allows the valve stem to disengage from the starting thread at the other end of the thread on the valve core assembly.

[0007] In one embodiment, the valve body assembly has a first flow port on its side wall. In the fully closed state, the side wall of the valve core assembly is blocked by the first flow port. The valve stem includes an external thread section, and the valve core assembly includes an internal thread section. The external thread section and the internal thread section are threaded together. 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 stem along the axial direction of the valve stem to the inner wall of the first flow port is D4, where D3+D4<D1+D2-D.

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

[0010] In one embodiment, the first elastic component 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. In the fully open state, the valve core assembly abuts against the first gasket and compresses the first elastic element.

[0011] In one embodiment, the valve body assembly is provided with a first abutting portion. In the fully closed state, the first gasket abuts against 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 component 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. In the fully closed state, the valve core assembly abuts against the second gasket and compresses the second elastic element.

[0013] In one embodiment, the valve body assembly is provided with a second abutment portion. In the fully open state, the second gasket abuts against the second abutment 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 has a flow cavity and a first flow port communicating with the flow cavity; the valve structure also includes a first seal and a second seal. In the fully closed state, the first seal and the second seal are respectively disposed at both ends of the first flow port along the axial direction of the flow cavity, and the first seal and the second seal are respectively sealed and engaged with the inner wall of the flow cavity and the outer 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 the side of the second seal near the valve stem. In the fully closed state, the shortest distance from the end of the first seal away from the valve stem along the axial direction of the valve body assembly to the inner wall of the first flow port is D5, and the shortest distance from the end of the second seal near the valve stem along the axial direction of the valve body assembly to the inner wall of the first flow port is D6. The valve stem includes an external thread section, and the valve core assembly includes an internal thread section. The external thread section and the internal thread section are threadedly engaged, 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 has a flow cavity and a first flow port communicating with the flow cavity; in the fully closed state, the projection of the opening of the first flow port near the flow cavity onto the valve core assembly is always located on the valve core assembly.

[0017] In one embodiment, the valve structure further includes a rotary bearing mounted within the valve body assembly, with the outer ring of the rotary bearing connected to the valve body assembly and the inner ring of the rotary bearing connected to the valve stem, such that the rotary bearing can prevent axial movement of the valve stem relative to the valve body assembly.

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

[0019] This 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 the 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 threadedly engaged 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 disengage.

[0020] This 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 the 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 threadedly engaged 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 initial thread of the thread on the valve stem and the nut seat can disengage.

[0021] Compared with existing technologies, the valve structure, gate valve, and electronic expansion valve provided in this application, by disengaging the internal and external threads on the valve stem and valve core assembly in the fully closed state, prevent the valve stem from continuing to move the valve core assembly when it moves to the fully closed position due to the disengaged threads, thus ensuring that the valve core assembly is in place. Therefore, the valve stem and valve core assembly can maintain a relatively stable state, effectively avoiding the situation in traditional structures where axial stoppage increases friction between the internal and external threads, leading to structural jamming, thereby improving the service life of the valve structure. Attached Figure Description

[0022] 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.

[0023] Figure 1 is a cross-sectional view (fully closed state) of a gate valve according to an embodiment of the present application.

[0024] Figure 2 is a cross-sectional view (fully open state) of a gate valve according to an embodiment of this application.

[0025] Figure 3 is a cross-sectional view (fully closed state) of a gate valve according to another embodiment of this application.

[0026] Figure 4 is a cross-sectional view (fully open state) of a gate valve according to another embodiment of this application.

[0027] Figure 5 is a cross-sectional view of a gate valve according to an embodiment of this application;

[0028] Figure 6 is a schematic diagram of the structure of a limiting sleeve according to an embodiment of this application;

[0029] Figure 7 is a schematic diagram of the structure of a nut sleeve according to an embodiment of this application;

[0030] Figure 8 is a cross-sectional view of a gate valve according to an embodiment of this application;

[0031] Figure 9 is a cross-sectional view of a gate valve according to another embodiment of this application;

[0032] Figure 10 is a schematic diagram of the structure of a connecting sleeve according to an embodiment of this application;

[0033] Figure 11 is a cross-sectional view of an electronic expansion valve according to an embodiment of this application.

[0034] The symbols in the diagram represent the following meanings:

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

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please refer to Figures 1-11. This application provides a valve structure 100, which can be a gate valve as shown in Figure 1 or an electronic expansion valve as shown in Figure 11. For ease of explanation, this application will specifically describe the valve structure 100 as a gate valve. 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 within 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. The valve stem 20 and the valve core assembly 30 are threadedly engaged, allowing the valve stem 20 to drive the valve core assembly 30 to move axially along the valve body assembly 10, thereby controlling the on / off state 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 initial thread of the thread on the valve stem 20 and the valve core assembly 30 can disengage, while in the fully open state, the initial thread of the thread on the other end of the thread on the valve stem 20 and the valve core assembly 30 can disengage.

[0042] Specifically, in this embodiment, as shown in Figures 1-4, 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 and the internal thread section 321 are threadedly engaged, thereby enabling the valve stem 20 to drive the valve core assembly 30 to move. Furthermore, the direction in which the valve core assembly 30 moves away from the valve stem 20 is taken as the closing direction of the valve structure 100. Thus, in the fully closed state, the starting thread of the external thread section 21 near the valve core assembly 30 disengages from the starting thread of the internal thread section 321 near the valve stem 20. In the fully open state, the starting thread of the other end of the external thread section 21 disengages from the starting thread of 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, while the internal thread section 321 is provided on the valve stem 20. Furthermore, the direction in which the valve core assembly 30 moves towards the valve stem 20 can also be taken as the closing direction of the valve structure 100, as long as the same effect is achieved.

[0043] It should be noted that, in this application, the starting tooth of the thread refers to the first complete tooth profile portion located at both ends of the thread; that is, each thread has two starting teeth, one at the beginning and one at the end. Furthermore, tooth removal in the fully closed / fully open state refers to the separation of the corresponding starting teeth at both ends of the internal and external threads from each other.

[0044] Understandably, this application disengages the internal and external threads on the valve stem 20 and the valve core assembly 30 when the valve stem 20 is in the fully closed position. This disengagement prevents the valve stem 20 from continuing to move the valve core assembly 30 when it moves to the fully closed position, thus ensuring the valve core assembly 30 is properly positioned. Therefore, the valve stem 20 and the valve core assembly 30 maintain a relatively stable state, effectively avoiding the structural jamming caused by increased friction between the internal and external threads due to axial stop in traditional structures, thereby extending the service life of the valve structure 100.

[0045] That is, the valve structure 100, such as the gate valve or electronic expansion valve in this application, can achieve the free rotation of the rotor assembly 40 by unspinning the internal and external threads, thereby preventing jamming. Its specific structure can be appropriately changed.

[0046] Furthermore, the valve structure 100 also includes a rotor assembly 40, which is connected to the 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 is electrically driven, which effectively improves the convenience of valve operation compared to traditional manual operation. For example, the rotor assembly 40 can drive the valve stem 20 to rotate clockwise to close the valve, and drive the valve stem 20 to rotate counterclockwise to open the valve. Of course, it can be reasonably configured according to actual needs, and is not limited here.

[0047] To facilitate the re-threading of the external thread segment 21 and the internal thread segment 321 at the beginning of the valve opening and / or closing process, in one embodiment, as shown in Figures 1 and 2, the valve structure 100 further includes an elastic element 50, with its two ends connected to the valve body assembly 10 and the valve core assembly 30, respectively. Specifically, in the fully open state, the elastic element 50 can apply a force to the valve core assembly 30, moving it away from the valve stem 20; and / or, in the fully closed state, the elastic element 50 can apply a force to the valve core assembly 30, moving it closer to the valve stem 20. Thus, the elastic element 50 not only maintains the connection between the valve stem 20 and the valve core assembly 30 during the unthreading of the internal and external threads, preventing them from disengaging, but also facilitates re-threading from both ends, reducing the difficulty of re-threading and allowing the internal thread segment 321 to smoothly re-thread with the external thread segment 21, ensuring that the valve stem 20 can again drive the valve core assembly 30 to move.

[0048] Specifically, one end of the elastic element 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 tension of the elastic element 50, thereby generating forces in different directions. Furthermore, due to the presence of the elastic element 50, after the internal and external threads are de-threaded, the valve core assembly 30 will fluctuate up and down by a pitch. Taking the valve closing as an example, when the rotor assembly 40 moves towards the valve closing direction, after it is fully closed, if the valve core assembly 30 fluctuates downward by one pitch, it is still in the de-threaded state. If it fluctuates upward by one pitch, the valve core assembly 30 moves upward, but at this time the rotor assembly 40 is still rotating towards the valve closing direction, and the valve core assembly 30 will continue to move to the position where the internal and external threads are de-threaded. Therefore, when fully closed, if the valve stem 20 does not change its rotation direction, the valve core assembly 30 actually fluctuates within a range of one pitch, but eventually returns to the position where the internal and external threads are de-threaded. When the rotor assembly 40 (i.e., valve stem 20) changes its rotation direction, regardless of the position of the starting tooth, it can float towards the valve stem 20 under the action of the elastic element 50, thereby returning to the position of disengaged tooth and re-toothing.

[0049] Here, the elastic element 50 can be located at the end of the valve core assembly 30 near the valve stem 20 to reduce the impact of fluid on the elastic element 50 and improve the reliability of use. Of course, in other embodiments, the elastic element 50 can also be placed at the end of the valve core assembly 30 away from the valve stem 20, as long as the same backing effect can be achieved.

[0050] In another embodiment, as shown in Figures 3 and 4, the valve structure 100 further includes a first elastic component 60. The first elastic component 60 is disposed at one end of the valve core assembly 30 near the valve stem 20. In the fully open state, the first elastic component 60 can apply a force to the valve core assembly 30 to move away from the valve stem 20. In this way, the internal and external threads can be re-threaded during the valve closing process, while preventing the valve stem 20 and the valve core assembly 30 from separating.

[0051] Similarly, the valve structure 100 also includes a second elastic component 70, which is located at the end of the valve core assembly 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 assembly 30 to move towards the valve stem 20. In this way, the internal and external threads can be re-threaded during the valve opening process, while preventing the valve stem 20 and the valve core assembly 30 from separating.

[0052] In summary, through the combined action of the first elastic component 60 and the second elastic component 70, a function similar to that of the elastic element 50 can be achieved, realizing the return of the internal and external threads during the initial opening and closing of the valve. Here, one end of the first elastic component 60 is fixedly connected to the valve body assembly 10, and the other end is movably connected to the valve core assembly 30.

[0053] As shown in Figures 3 and 4, 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 assembly 10, and the other end is connected to the first gasket 62. In the fully open state, the valve core assembly 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 assembly 30 compresses the first elastic element 61 in the fully open state, the first elastic element 61 can apply an axial force to the valve core assembly 30 via the first gasket 62, moving it in the valve-closing direction. This causes the starting tooth of the external thread segment 21 near the rotor assembly 40 and the starting tooth of the internal thread segment 321 away from the rotor assembly 40 to be in a movable engagement state, facilitating the return of the external thread segment 21 and the internal thread segment 321 when the valve is closed again. The first gasket 62 facilitates the contact engagement between the first elastic element 61 and the valve core assembly 30.

[0054] Furthermore, the valve body assembly 10 is provided with a first abutting portion 112. In the fully closed state, the first gasket 62 abuts against the first abutting portion 112. In the fully open state, the valve core assembly 30 abuts against the first gasket 62 and compresses the first elastic element 61. Thus, when the valve core assembly 30 disengages from the first elastic element 60, the first elastic element 60 can abut against the first abutting portion 112 to provide support, thereby ensuring the stability of the first elastic element 60 and preventing shaking.

[0055] As shown in Figures 3 and 4, 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 assembly 10, and the other end is connected to the second gasket 72. In the fully closed state, the valve core assembly 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 assembly 30 compresses the second elastic element 71 in the fully closed state, the second elastic element 71 can apply an axial force to the valve core assembly 30 via the second gasket 72, moving it in the valve opening direction. This causes the starting tooth of the external thread segment 21 away from the rotor assembly 40 to be in a movable engagement state with the starting tooth of the internal thread segment 321 near the rotor assembly 40, facilitating the re-threading of the external thread segment 21 and the internal thread segment 321 when the valve is reopened. The second gasket 72 facilitates the contact engagement between the second elastic element 71 and the valve core assembly 30.

[0056] Furthermore, the valve body assembly 10 is provided with a second abutment portion 113. In the fully open state, the second gasket 72 abuts against the second abutment portion 113. In the fully closed state, the valve core assembly 30 abuts against the second gasket 72 and compresses the second elastic element 71. Thus, when the valve core assembly 30 disengages from the second elastic element 70, the second elastic element 70 can abut against the second abutment portion 113 to provide support, thereby ensuring the stability of the second elastic element 70 and preventing shaking.

[0057] In summary, when the valve core assembly 30 moves toward the valve closing direction, the rotor assembly 40 drives the valve stem 20 to rotate. The valve stem 20 drives the valve core assembly 30 to move axially away from the valve stem 20 through threaded transmission until the valve core assembly 30 moves to the fully closed position. At this time, the external thread section 21 on the valve stem 20 is located on the side of the internal thread section 321 on the valve core assembly 30 that is close to the rotor assembly 40. The starting tooth of the external thread section 21 away from the rotor assembly 40 and the starting tooth of the internal thread section 321 that is close to the rotor assembly 40 are in a movable engagement state under the action of the elastic element 50 or the second elastic element 70.

[0058] When the valve core assembly 30 moves in the opening direction, the rotor assembly 40 drives the valve stem 20 to rotate in the opposite direction. The valve stem 20 drives the valve core assembly 30 to move axially towards the valve stem 20 through thread transmission until the valve core assembly 30 moves to the fully open position. At this time, the external thread section 21 on the valve stem 20 is located on the side of the internal thread section 321 on the valve core assembly 30 away from the rotor assembly 40. The starting tooth of the external thread section 21 near the rotor assembly 40 and the starting tooth of the internal thread section 321 away from the rotor assembly 40 are in a movable engagement state under the action of the elastic element 50 or the first elastic element 60.

[0059] In one embodiment, 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 valve core assembly 30 is movably installed within the flow cavity 101. The first flow port 102 and the second flow port 103 are both located on the side wall of the valve body assembly 10. Furthermore, when the valve structure 100 is in the fully open state, the first flow port 102 and the second flow port 103 can communicate through the flow cavity 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. The valve structure 100 also 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 cavity 101, and the second connecting pipe 15 is inserted into the second flow port 103 and communicates with the flow cavity 101.

[0060] It should be noted that the valve structure 100 of this application can have flow or no flow when fully closed. For example, when there is no flow between the first flow port 102 and the second flow port 103, the valve structure 100 can be a gate valve or an electronic expansion valve. Of course, there can also be a certain flow between the first flow port 102 and the second flow port 103. In this case, the second elastic component 70 or the elastic element 50 can apply 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 flow to pass through, so that it can be used in the electronic expansion valve shown in Figure 11. Specifically, when the valve structure 100 is an electronic expansion valve, as shown in Figure 11, the electronic expansion valve may also include a nut seat 80, which is fixedly connected to the valve body assembly 10, and the valve stem 20 is threadedly engaged 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. That is, the valve stem 20 of the electronic expansion valve can be threadedly engaged with the nut seat 80 fixed on the valve body assembly 10, and then connected to the valve core assembly 30, rather than being directly threadedly engaged with the valve core assembly 30. Based on this, when the electronic expansion valve is fully closed, the initial threads of the valve stem 20 and the nut seat 80 can disengage, thus achieving an anti-jamming effect similar to that of the gate valve described above. Specifically, when the electronic expansion valve is fully closed and there is no flow, the valve core assembly 30 can abut against the valve port 90. When the electronic expansion valve is fully closed and there is flow, the valve core assembly 30 abuts against the valve port 90, and a certain amount of fluid passes through when fully closed by providing a flow gap (flow groove, etc.) on the valve port 90 or the valve core assembly 30.

[0061] Furthermore, the elastic element 50, which acts as a return thread, can be positioned between the nut seat 80 and the valve core assembly 30 of the electronic expansion valve, and can be appropriately configured according to actual needs. Simultaneously, the flow rate in the fully closed state can also be controlled by the elastic element 50. For example, by applying force to the valve core assembly 30 through the elastic element 50, a gap is created between the end of the valve core assembly 30 and the valve port 90, allowing a certain amount of fluid to pass through when fully closed.

[0062] In one embodiment, as shown in Figures 1-4, 8, and 9, the first flow port 102 and the second flow port 103 are spaced apart axially in the valve body assembly 10. In the fully closed state, the valve core assembly 30 blocks one of the first flow port 102 and the second flow port 103, while the other of the first flow port 102 and the second flow port 103 communicates with the flow cavity 101. By spaced the two flow ports apart, 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 connected to the flow cavity 101. This helps to maintain the internal balance of the valve structure 100 in the closed state.

[0063] Specifically, in a traditional straight-through structure, when the valve structure 100 is closed, the fluid pressure at the flow ports on both sides of the valve core assembly 30 is different. The high-pressure side will push the valve core assembly 30 to the low-pressure side, resulting in increased friction between the valve core assembly 30 and the inner wall of the flow cavity 101, thus increasing the difficulty of opening the valve core assembly 30. In this 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 a movable sealing fit. Therefore, the valve core assembly 30 will divide the flow cavity 101 into two relatively independent cavities. Furthermore, since the two flow ports are offset axially, in the fully closed state, that is, when the valve structure 100 closes one flow port, the other can still maintain communication with one of the two cavities. Here, the portions of the flow chamber 101 located axially on opposite sides of the valve core assembly 30 can be defined as the first chamber 1011 and the second chamber 1012. In this case, pressure balance between the first chamber 1011 and the second chamber 1012 on both sides of the valve core assembly 30 can be achieved simply by machining the valve core assembly 30, without affecting the sealing effect of the valve core assembly 30 and the inner wall of the flow chamber 101. For example, a balance channel 301 is provided on the valve core assembly 30, with its two ends connected to the first chamber 1011 and the second chamber 1012 respectively. That is, in the fully closed state, the valve core assembly 30 is blocked by one of the first flow port 102 and the second flow port 103, while the other of the first flow port 102 and the second flow port 103 is connected to the balance channel 301. This achieves pressure balance between the first chamber 1011 and the second chamber 1012 in the fully closed state of the valve structure 100, thereby greatly reducing the difficulty of opening the valve when the valve core assembly 30 moves axially.

[0064] For ease of explanation, this application defines the cavity closer to the valve stem 20 in the two cavities formed by dividing the flow cavity 101 as the first cavity 1011, and the cavity farther away from the valve stem 20 as the second cavity 1012. That is, the first cavity 1011 is located on the side of the second cavity 1012 closer to the valve stem 20.

[0065] Furthermore, the valve structure 100 also includes a first sealing element 311 and a second sealing element 312. In the fully closed state, the first sealing element 311 and the second sealing element 312 are respectively disposed at both ends of the first flow port 102 or the second flow port 103 along the axial direction of the flow cavity 101. The first sealing element 311 and the second sealing element 312 are respectively sealed and cooperated with the inner wall of the flow cavity 101 and the outer wall of the valve core assembly 30, so that the valve core assembly 30 can be blocked in one of the first flow port 102 and the second flow port 103.

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

[0067] Understandably, this configuration allows the first seal 311 and the second seal 312 to 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 of the valve structure 100 when closed. Simultaneously, the staggered arrangement of the first flow port 102 and the second flow port 103 makes it easier to process the valve core assembly 30 to achieve internal balance of the valve structure 100 in the closed state, thereby reducing the difficulty of opening the valve structure 100.

[0068] Similarly, for ease of explanation, this application defines the one of the two flow ports that is closer to the valve stem 20 along the axial direction as the first flow port 102, and the one that is farther away from the valve stem 20 as the second flow port 103. That is, along the axial direction of the flow cavity 101, the first flow port 102 is located on the side of the second flow port 103 that is closer to the valve stem 20.

[0069] Based on this, in the fully closed state, the sidewall of the valve core assembly 30 can be sealed to the first flow port 102 to reduce the length of the valve stem 20 and / or the valve core assembly 30, which helps to reduce the cost of the valve structure 100. Furthermore, taking the fully closed state with the sidewall of the valve core assembly 30 sealed to the first flow port 102 as an example, the projection of the opening of the first flow port 102 near the flow chamber 101 onto the valve core assembly 30 along its own axial direction is located between the first seal 311 and the second seal 312. Thus, 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 flow with the first flow port 102, preventing internal leakage. Simultaneously, the second flow port 103 can communicate with the first chamber 1011 through the second chamber 1012 and the balance channel 301, thereby achieving pressure balance at both ends of the valve core assembly 30.

[0070] Furthermore, the first sealing element 311 and the second sealing element 312 are arranged in parallel, that is, the first sealing element 311 and the second sealing element 312 can be two parallel sealing rings, which have a simple structure and are easy to install.

[0071] Optionally, the first seal 311 and the second seal 312 can be installed on the valve core assembly 30. For example, as shown in FIG1, the outer side wall of the valve core assembly 30 has a first sealing groove 302 and a second sealing groove 303 recessed towards 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 when moving or in the fully closed state, thus eliminating the need for additional seals and reducing costs.

[0072] Of course, the first sealing element 311 and the second sealing element 312 can also be installed on the inner wall of the flow cavity 101. For example, the inner wall of the flow cavity 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 provided at both ends of the first flow port 102 or the second flow port 103 along the axial direction of the flow cavity 101. Furthermore, the first sealing element 311 is installed in the first sealing groove 302, and the second sealing element 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 ease of explanation, this application will only describe the example of the first seal 311 and the second seal 312 being installed on the valve core assembly 30. Similarly, for ease of explanation, the seal that is axially closer to the valve stem 20 can be defined as the first seal 311, and the seal that is farther away from the valve stem 20 can be defined as the second seal 312. That is, the first seal 311 is located on the side of the second seal 312 that is closer to the valve stem 20.

[0074] In other embodiments, the first seal 311 and the second seal 312 may not be provided. Instead, in the fully closed state, the projection of the opening of the first flow port 102 near the flow cavity 101 onto the valve core assembly 30 is always located on the valve core assembly 30. That is, the seal is achieved directly by the outer wall of the valve core assembly 30 cooperating with the inner wall of the flow cavity 101. In this way, it can be ensured that the valve core assembly 30 can maintain a reliable seal on the first flow port 102 during the process of floating by one pitch.

[0075] To ensure complete flow between the two flow ports when the valve structure 100 is fully open, in one embodiment, as shown in Figures 1 and 3, the thread pitch of 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, and 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 axial direction of the valve stem 20 to the inner wall of the first flow port 102 is D4, where D3+D4<D1+D2-D. It is easy to understand that the distance that the valve core assembly 30 moves from the fully closed state to the fully open state is at least the sum of the lengths of two threaded segments. D3+D4 is the minimum distance that the valve core assembly 30 needs to move 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 core assembly 30 moves to the fully open position, even if the valve core assembly 30 floats relative to the valve stem 20 by one thread pitch, the valve core assembly 30 will not block the first flow port 102, thereby improving the fluid flow performance.

[0076] Further, as shown in Figures 1 and 3, in the fully closed state, the shortest distance from the end of the first sealing member 311 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 sealing member 312 near 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. Wherein, D5≥D, D6≥D. This eliminates the error caused by the thread pitch, ensuring that in the fully closed state, the first sealing member 311 and the second sealing member 312 can effectively seal the first flow port 102.

[0077] In one embodiment, as shown in Figures 1 and 7, the valve core assembly 30 includes a valve head 31 and a nut sleeve 32. The nut sleeve 32 is disposed at one end of the valve head 31. Here, the valve head 31 and the nut sleeve 32 can be an integral or separate structure. An internal thread section 321 is provided in the nut sleeve 32. The end of the valve stem 20 away from the rotor assembly 40 is inserted into the nut sleeve 32 and threadedly connected to it, so that the valve stem 20 can drive the valve core assembly 30 to move axially. Furthermore, when the valve head 31 and the nut sleeve 32 are separate, it facilitates the machining of the valve head 31 and the nut sleeve 32, reducing machining difficulty.

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

[0079] Furthermore, as shown in Figures 1-5 and 7, the valve body assembly 10 is also provided with a limiting hole 104 communicating with the flow cavity 101. The end of the nut sleeve 32 away from the valve head 31 is movably inserted into the limiting hole 104. The valve stem 20 passes through the limiting hole 104 and is threadedly connected to the nut sleeve 32, which is used to drive the valve core assembly 30 to move axially, thereby controlling the opening and closing of the valve structure 100. The nut sleeve 32 and the limiting hole 104 have an anti-rotation structure to prevent the nut sleeve 32 from rotating relative to the limiting hole 104.

[0080] Understandably, by setting an anti-rotation structure, the nut sleeve 32 and the limiting hole 104 can be prevented from rotating, ensuring that the nut sleeve 32 can only move axially during valve opening and closing, and will not rotate circumferentially. This effectively prevents the valve core assembly 30 from rotating, thereby reducing friction between the valve core assembly 30 and the inner wall of the flow chamber 101. This not only reduces frictional wear and extends the service life of components, but also reduces frictional noise, thus improving the user experience of the valve structure 100.

[0081] Specifically, in this embodiment, the outer wall of the nut sleeve 32 is provided with a first anti-rotation part 322, and the inner wall of the limiting hole 104 is provided with a second anti-rotation part 121. The first anti-rotation part 322 and the second anti-rotation part 121 are mutually restrictive and engaged. That is, the anti-rotation structure includes the first anti-rotation part 322 provided on the outer wall of the nut sleeve 32 and the second anti-rotation part 121 provided on the inner wall of the limiting hole 104. Both the first anti-rotation part 322 and the second anti-rotation part 121 can be configured with anti-rotation surfaces. Here, the anti-rotation surface can be a planar structure for better anti-rotation effect, or it can be a curved surface or other structure with a certain curvature. Of course, in other embodiments, the anti-rotation structure can also adopt a structure that can achieve circumferential anti-rotation, such as protrusions and grooves, which are not limited here.

[0082] Furthermore, there are multiple first anti-rotation portions 322, which are spaced apart on the outer side wall of the nut sleeve 32. The number of second anti-rotation portions 121 corresponds one-to-one with the number of first anti-rotation portions 322. This further prevents circumferential rotation of the nut sleeve 32 and ensures the stability of the valve core assembly 30's axial movement.

[0083] In this embodiment, there are two first anti-rotation parts 322, and the two first anti-rotation parts 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 anti-rotation parts 322 can also be set to three, four, etc., as long as they can achieve the same effect.

[0084] To facilitate the machining of the limiting hole 104, in one embodiment, as shown in Figures 5 and 6, the valve body assembly 10 includes a valve seat 11 and a limiting sleeve 12, with the limiting sleeve 12 disposed at one end of the valve seat 11 and fixedly connected to it. The limiting hole 104 is formed in the limiting sleeve 12. Thus, by separating the valve seat 11 and the limiting sleeve 12, the limiting sleeve 12 can be machined individually, thereby improving the machining accuracy of the limiting sleeve 12 and reducing the machining difficulty. Alternatively, the valve seat 11 and the limiting sleeve 12 can also be an integral structure.

[0085] Furthermore, as shown in Figures 5 and 6, the valve seat 11 is provided with a first limiting part 111, and the limiting sleeve 12 is provided with a second limiting part 122. The first limiting part 111 and the second limiting part 122 are connected in cooperation to prevent the limiting sleeve 12 from rotating relative to the valve seat 11. In this way, the resistance to the rotation of the limiting sleeve 12 relative to the valve seat 11 can be increased, achieving the anti-rotation effect between the valve seat 11 and the limiting sleeve 12, and further ensuring that the limiting sleeve 12 can apply sufficient force to the nut sleeve 32, ensuring that the nut sleeve 32 and the limiting sleeve 12 will not rotate together when moving along the limiting hole 104, thereby improving the reliability of the overall structure.

[0086] Specifically, as shown in Figures 6 and 10, the valve seat 11 includes a main body 114 and a connecting sleeve 115. The connecting sleeve 115 is disposed at one end of the main body 114 and fixedly connected to the main body 114. A connecting boss 1151 protrudes from the inner wall of the connecting sleeve 115, and one end of the limiting sleeve 12 passes through and is installed on the connecting boss 1151. A first limiting part 111 is disposed on the inner wall of the connecting boss 1151, and a second limiting part 122 is disposed on the outer wall of the limiting sleeve 12. One of the first limiting part 111 and the second limiting part 122 is configured as a limiting protrusion, and the other is configured as a limiting groove. The limiting protrusion is inserted into the limiting groove to prevent the limiting 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 limiting sleeve 12 can be guaranteed.

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

[0088] Since in this embodiment, the valve stem 20 drives the valve core assembly 30 to move, and the axial movement of the valve core assembly 30 achieves the valve opening and closing functions, 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 kept constant. Based on this, in one embodiment, the valve structure 100 also includes a rotary bearing 22, which is installed inside the valve body assembly 10. The outer ring of the rotary bearing 22 is connected to the valve body assembly 10, and the inner ring of the rotary bearing 22 is connected to the valve stem 20, so that the rotary 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 achieves both connection with the valve body assembly 10 and axial limitation through the rotary bearing 22, and also reduces the resistance when the valve stem 20 rotates circumferentially, resulting in higher reliability. Furthermore, the valve stem 20 can only rotate circumferentially through the rotating bearing 22, while remaining stationary axially. The nut sleeve 32 is kept circumferentially stationary through the limiting sleeve 12. Therefore, the nut sleeve 32 can only move axially under the threaded drive of the valve stem 20.

[0089] To further reduce the probability of axial movement of the valve stem 20, a protrusion 23 is formed on the outer periphery of the valve stem 20. The valve structure 100 also includes a mating part 24. The protrusion 23 and the mating part 24 are respectively located at opposite ends of the rotating bearing 22 along its own axial direction, and the mating part 24 is sleeved and connected to the valve stem 20 so that the protrusion 23 and the mating part 24 can cooperate to clamp the inner ring of the rotating bearing 22. In this way, through the connection between the mating part 24 and the valve stem 20, and in conjunction with the protrusion 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, preventing the valve stem 20 from moving axially, and making the overall structure more reliable.

[0090] Specifically, the valve body assembly 10 also includes a bearing seat 13, which is sleeved on the outer periphery of the limiting sleeve 12 and connected to both the valve seat 11 and the limiting sleeve 12 to prevent the limiting sleeve 12 from moving axially relative to the valve seat 11. Optionally, the bearing seat 13 can be connected to a connecting sleeve 115 on the valve seat 11, and its end and / or internal stepped holes cooperate with the connecting boss 1151 on the connecting sleeve 115 to achieve axial limiting of the limiting sleeve 12. A rotary bearing 22 is installed inside the bearing seat 13, with its outer ring fixedly connected to the bearing seat 13 and its inner ring connected to the valve stem 20, so that the rotary bearing 22 can prevent the valve stem 20 from moving axially. This facilitates the installation of the rotary bearing 22.

[0091] In one embodiment, as shown in Figures 8 and 9, a first flow port 102 and a second flow port 103 are formed on opposite radial sides of the valve body assembly 10. Since a first connecting pipe 14 is connected to the first flow port 102 and a second connecting pipe 15 is connected to the second flow port 103, the first connecting pipe 14 and the second connecting pipe 15 are respectively connected to opposite radial sides of the valve body assembly 10. The end of the first connecting pipe 14 furthest from the valve body assembly 10 and the end of the second connecting pipe 15 furthest from the valve body assembly 10 are coaxially arranged.

[0092] It is understandable that after the first connecting pipe 14 and the second connecting pipe 15 are connected to the valve body assembly 10, the ends of both connected to the external pipeline can be located on the same straight line. This facilitates the determination of the installation position of the valve structure 100, improves the installation efficiency of the valve structure 100, and reduces the installation difficulty. For example, when the first flow port 102 and the second flow port 103 are spaced apart axially, during the installation process, it is only necessary to adjust the installation angle of the valve body assembly 10 appropriately so that the connecting pipes on both sides can be flush with the system pipeline to achieve installation.

[0093] Furthermore, the end of the first connecting pipe 14 near the valve body assembly 10 and the end of the second connecting pipe 15 near the valve body assembly 10 are spaced apart axially in the valve body assembly 10. That is, the first flow port 102 and the second flow port 103 are spaced apart axially in the valve body assembly 10. Thus, this application is beneficial for maintaining the internal balance of the valve structure 100 in the closed state.

[0094] In one embodiment, as shown in FIG8, the first connecting pipe 14 is configured as a straight pipe, and the axis of the first connecting pipe 14 is set at an angle to the axis of the valve body assembly 10. Similarly, the second connecting pipe 15 is also configured as a straight pipe, and the axis of the second connecting pipe 15 is set at an angle to the axis of the valve body assembly 10. Thus, the structures of the first connecting pipe 14 and the second connecting pipe 15 are simple and easy to manufacture.

[0095] In another embodiment, as shown in FIG9, 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 located 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, wherein there is a bend between the first adapter portion 142 and the first connecting portion 141. Meanwhile, 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 located 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, wherein there is a bend between the second adapter portion 152 and the second connecting portion 151. Thus, the arrangement of the first connecting pipe 14 and the second connecting pipe 15 is more flexible, and the included angles between the first adapter 142 and the first connecting pipe 141, and between the second adapter 152 and the second connecting pipe 151, can be adjusted according to actual needs to facilitate the processing of the first flow port 102 and the second flow port 103. The bends between the first connecting pipe 141 and the first adapter 142, and between the second connecting pipe 151 and the second adapter 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 part 141 and the second connecting part 151 are used to connect to the system pipeline, and the first connecting part 141 and the second connecting part 151 are located on the same axis. This facilitates the connection of the first connecting part 141 and the second connecting part 151 to the external system pipeline and reduces the installation difficulty.

[0097] Furthermore, the axis of the first adapter 142 can be perpendicular to the axis of the valve body assembly 10. Simultaneously, the axis of the second adapter 152 can be 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 perpendicular to the axial direction of the valve body assembly 10, which helps improve processing efficiency and reduce processing difficulty.

[0098] However, this is not the only option. In other embodiments, the first connecting pipe 14 can be configured as a straight pipe, and the second connecting pipe 15 can be configured such that the second connecting portion 151 and the second transition portion 152 are arranged at an angle and connected to each other. Of course, the first connecting pipe 14 can also be configured such that the first connecting portion 141 and the first transition portion 142 are arranged at an 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 the ends of the first connecting pipe 14 and the second connecting pipe 15 connected to the external pipeline are on the same straight line after they are connected to the valve body assembly 10.

[0099] 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.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A valve structure, characterized in that, The valve 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 the 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) and the valve core assembly (30) are threaded together 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 opening and closing 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 disengage.

2. The valve structure according to claim 1, characterized in that, In the fully open state, the valve structure allows the starting thread at the other end of the thread on the valve stem (20) to disengage from the valve core assembly (30).

3. The valve structure according to claim 2, characterized in that, The valve body assembly (10) has a first flow port (102) on its side wall. In the fully closed state, the side wall of the valve core assembly (30) is blocked in 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) and the internal thread section (321) are threaded together. 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 axial direction of the valve stem (20) to the inner wall of the first flow port (102) is D4. 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 element (50), which is disposed at one end of the valve core assembly (30) near the valve stem (20), and the two ends of the elastic element (50) are respectively connected to the valve body assembly (10) and the valve core assembly (30); wherein, in the fully open state, the elastic element (50) can apply a force to the valve core assembly (30) to move away from the valve stem (20), and in the fully closed state, the elastic element (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 component (60), which is located at one end of the valve core assembly (30) near the valve stem (20). In the fully open state, the first elastic component (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), which is located at one end of the valve core assembly (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 assembly (30) to move towards 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 assembly (10), and the other end is connected to the first gasket (62). In the fully open state, the valve core assembly (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 assembly (10) is provided with a first abutting part (112). In the fully closed state, the first gasket (62) abuts against the first abutting part (112). In the fully open state, the valve core assembly (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 assembly (10), and the other end is connected to the second gasket (72). In the fully closed state, the valve core assembly (30) abuts against the second gasket (72) and compresses the second elastic element (71).

9. The valve structure according to claim 8, characterized in that, The valve body assembly (10) is provided with a second abutment portion (113). In the fully open state, the second gasket (72) abuts against the second abutment portion (113). In the fully closed state, the valve core assembly (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 assembly (10) has a flow cavity (101) and a first flow port (102) communicating with the flow cavity (101); the valve structure also 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 located at both ends of the first flow port (102) along the axial direction of the flow cavity (101), and the first seal (311) and the second seal (312) are respectively sealed and cooperated with the inner wall of the flow cavity (101) and the outer wall of the valve core assembly (30) so that the valve core assembly (30) can block the first flow port (102).

11. The valve structure according to claim 10, characterized in that, The first seal (311) is disposed on the side of the second seal (312) near the valve stem (20). In the fully closed state, the shortest distance from the end of the first seal (311) 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. The shortest distance from the end of the second seal (312) near 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 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) and the internal thread section (321) are threaded together. The pitch of the threads on the external thread section (21) and the internal thread section (321) is D. Wherein, D5≥D and D6≥D.

12. The valve structure according to claim 1, characterized in that, The valve body assembly (10) has 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 of the first flow port (102) near 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 also includes a rotary bearing (22), which is installed inside the valve body assembly (10). The outer ring of the rotary bearing (22) is connected to the valve body assembly (10), and the inner ring of the rotary bearing (22) is connected to the valve stem (20) so that the rotary 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, The valve stem (20) has a protruding part (23) on its outer periphery. The valve structure also includes a mating part (24). The protruding part (23) and the mating part (24) are respectively provided at opposite ends of the rotating bearing (22) along its own axial direction. The mating part (24) is sleeved and connected to the valve stem (20) so that the protruding part (23) and the mating part (24) can cooperate to clamp the inner ring of the rotating bearing (22).

15. A gate valve, characterized in that, The valve 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 the 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) and the valve core assembly (30) are threaded together 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 opening and closing 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 disengage.

16. An electronic expansion valve, characterized in that, The valve 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 inside the valve body assembly (10). The rotor assembly (40) is connected to the 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 threadedly engaged 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. In the fully closed state, the starting teeth of the threads on the valve stem (20) and the nut seat (80) can disengage.

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