Electronic expansion valve

Abstract

This utility model provides an electronic expansion valve, comprising: a valve body having a valve cavity; a valve seat core disposed within the valve body, the valve seat core having a valve core cavity, a gap between the outer wall of the valve seat core and the inner wall of the valve body to form a flow gap, the valve core cavity communicating with the valve cavity through the gap; and a valve core sleeve disposed within the valve body, the valve core sleeve being movable relative to the gap to block or open the gap, the valve core sleeve slidingly sealingly engaging with the valve body and / or the valve seat core. Applying the technical solution of this utility model can solve the problem of potential sealing failure when a unidirectional sealing element blocks annular gaps in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and more specifically, to an electronic expansion valve. Background Technology

[0002] Please refer to Figure 1 As shown, in the related technology of electronic expansion valve, two connecting pipes are provided on the side wall and end of the valve body. The electronic expansion valve is connected to the system pipeline through the two connecting pipes. The electronic expansion valve is provided with a connecting element 10 and a one-way sealing element 20 inside. There is a gap 30 between the connecting element and the valve body. The inner cavity of the connecting element 10 can communicate with the inner cavity of the valve body through the gap 30. The one-way sealing element 20 can block the gap 30 and allow fluid to enter the inner cavity of the connecting element 10 through the valve port provided on the connecting element 10 and pass through the inner cavity of the valve body.

[0003] To achieve a specific flow curve, when the connecting pipe on the side wall of the valve body is used as the inlet pipe, under the action of differential pressure, the one-way sealing element 20 can move toward the gap 30 to block the gap 30. The valve needle adjusts the flow of the electronic expansion valve by regulating the flow of the valve port. When the connecting pipe at the end of the valve body is used as the inlet pipe, the fluid will push the one-way sealing element 20 to move away from the gap 30 to open the gap 30 between the connecting element 10 and the valve body, so as to realize the flow of fluid.

[0004] However, due to the assembly and dimensional tolerances of the valve body and the connecting part 10, the inner and outer rings of the gap 30 may have inconsistent dimensions in the height direction. When the one-way sealing part 20 may not seal properly in the sealing gap 30, the electronic expansion valve may experience internal leakage. Utility Model Content

[0005] This invention provides an electronic expansion valve to solve the problem of potential sealing failure when a one-way sealing component blocks the annular gap in the prior art.

[0006] This utility model provides an electronic expansion valve, which includes: a valve body having a valve cavity; a valve seat core disposed within the valve body, the valve seat core having a valve core cavity, a gap between the outer wall of the valve seat core and the inner wall of the valve body to form a flow gap, the valve core cavity being able to communicate with the valve cavity through the gap; and a valve core sleeve disposed within the valve body, the valve core sleeve being able to move relative to the gap to block or open the gap, the valve core sleeve slidingly sealingly engaging with the valve body and / or the valve seat core.

[0007] Furthermore, the valve core sleeve is in sliding sealing engagement with one of the valve body or valve seat cores, and when the valve core sleeve blocks the gap, the valve core sleeve is in sealing engagement with the other of the valve body or valve seat cores.

[0008] Furthermore, a sealing element is provided between the valve core sleeve and the inner wall of the valve body, and / or between the valve core sleeve and the outer wall of the valve seat core.

[0009] Furthermore, the valve body also has a mounting cavity communicating with the valve chamber, and at least a portion of the valve seat core is disposed in the mounting cavity, with a gap formed between the outer wall of the valve seat core and the inner wall of the mounting cavity.

[0010] Furthermore, the interval is annular, the inner wall of the valve core sleeve and the outer wall of the valve seat core slide and seal with each other, and the inner wall of the valve core sleeve or the outer wall of the valve seat core has a first receiving groove arranged in annularly, and the sealing element is disposed in the first receiving groove.

[0011] Furthermore, the inner diameter of the mounting cavity is smaller than the inner diameter of the valve cavity, and the valve seat core protrudes from the valve cavity at intervals.

[0012] Furthermore, the interval is annular, the outer wall of the valve core sleeve slides and seals with the inner wall of the mounting cavity, and the outer wall of the valve core sleeve or the inner wall of the mounting cavity has an annularly arranged second receiving groove, and the sealing element is disposed in the second receiving groove.

[0013] Furthermore, the inner wall of the mounting cavity protrudes beyond the valve core sleeve towards the valve cavity.

[0014] Furthermore, the intervals are circular.

[0015] Furthermore, the valve core sleeve has a sealing surface at the end facing the gap, which is used to seal with the valve body or valve seat core. The valve core sleeve has a first sealing section at the end facing the gap. The outer diameter of the first sealing section gradually increases along the gap toward the valve cavity. The side wall of the first sealing section forms a sealing surface. When the valve core sleeve seals with the valve body, the side wall of the first sealing section seals with the port of the mounting cavity facing the valve cavity.

[0016] Furthermore, the valve core sleeve has a sealing surface at the end facing the gap, which is used to seal with the valve body or valve seat core. The valve core sleeve has a second sealing section at the end facing the gap. The inner diameter of the second sealing section gradually decreases along the gap toward the valve cavity. The side wall of the second sealing section forms a sealing surface. When the valve core sleeve seals with the valve seat core, the sealing surface is used to seal with the end of the valve seat core facing the valve cavity.

[0017] Furthermore, the valve core sleeve has a sealing gasket facing the spaced end, the sealing gasket has a sealing surface, and the hardness of the sealing gasket is less than the hardness of the valve body and / or valve seat core.

[0018] Furthermore, the electronic expansion valve also has a valve needle assembly, which is movably disposed within the valve cavity. The valve seat core has a valve port communicating with the valve core cavity. The valve needle assembly is movable relative to the valve port. The valve core sleeve is fitted on the outside of the valve needle assembly and has a flow cavity. The valve port is able to communicate with the valve cavity through the flow cavity.

[0019] Furthermore, the valve needle assembly includes a nut seat and a valve needle assembly. The nut seat is sleeved on the outside of the valve needle, and the nut seat and the valve needle assembly are threaded together. The valve core sleeve and the nut seat are guided together.

[0020] By applying the technical solution of this utility model, and by setting the valve core sleeve to slide and seal with one or both of the valve body and valve seat core, the valve core sleeve can always maintain a seal with one or both of the valve body or valve seat core during the movement of the valve core sleeve. This eliminates the need for the valve core sleeve to simultaneously seal the valve body and valve seat core when it comes into contact with the gap, thus improving the adaptability of the valve core sleeve. This overcomes the sealing failure that may occur due to simultaneous sealing in traditional technical solutions, thereby reducing sealing failure caused by processing errors, lowering the risk of internal leakage in the electronic expansion valve, and ensuring the performance of the electronic expansion valve. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the structure of the electronic expansion valve provided in the background art is shown;

[0023] Figure 2 A schematic diagram of the structure of the electronic expansion valve provided in the first embodiment of this utility model is shown;

[0024] Figure 3 It shows Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 The diagram shows the structural schematics of the valve body provided in the first, second, third, and fifth embodiments of this utility model;

[0026] Figure 5 A schematic diagram of the valve seat core provided in the first embodiment of this utility model is shown;

[0027] Figure 6 A schematic diagram of the structure of the electronic expansion valve provided in the second embodiment of this utility model is shown;

[0028] Figure 7 It shows Figure 6 A magnified view of a section at point B in the middle;

[0029] Figure 8 A schematic diagram of the structure of the electronic expansion valve provided in the third embodiment of this utility model is shown;

[0030] Figure 9 It shows Figure 8 A magnified view of a section at point C;

[0031] Figure 10 A schematic diagram of the structure of the electronic expansion valve provided in the fourth embodiment of this utility model is shown;

[0032] Figure 11 It shows Figure 10 A magnified view of a section at point D;

[0033] Figure 12 A schematic diagram of the valve body provided in the fourth embodiment of this utility model is shown;

[0034] Figure 13 A schematic diagram of the structure of the electronic expansion valve provided in the fifth embodiment of this utility model is shown;

[0035] Figure 14 It shows Figure 13 A magnified view of a section at point E in the middle.

[0036] The above figures include the following reference numerals:

[0037] 10. Connecting component; 20. One-way sealing component; 30. Gap;

[0038] 01. Spacing; 02. Seal; 03. First receiving groove; 04. Second receiving groove; 05. First connecting pipe; 06. Second connecting pipe;

[0039] 100. Valve body; 101. Valve cavity; 102. Mounting cavity;

[0040] 200, Valve seat core; 201, Valve core cavity; 202, Connecting hole;

[0041] 300. Valve core sleeve; 301. Flow chamber; 302. Sealing surface; 303. Flow hole;

[0042] 310. First sealing section; 320. Second sealing section; 330. Sealing gasket;

[0043] 400, Valve needle assembly; 410, Nut seat; 420, Adjusting valve needle. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0045] like Figures 2 to 14 As shown, this embodiment of the present invention provides an electronic expansion valve, which includes a valve body 100, a valve seat core 200, and a valve core sleeve 300. The valve body 100 has a valve cavity 101, and a first connecting pipe 05 is provided on the side wall of the valve body 100. A second connecting pipe 06 is provided at the end of the valve body 100, and both the first connecting pipe 05 and the second connecting pipe 06 can communicate with the valve cavity 101. The valve seat core 200 is disposed within the valve body 100, and has a valve core cavity 201. A gap 01 is formed between the outer wall of the valve seat core 200 and the inner wall of the valve body 100. A connecting hole 202 is provided on the side wall of the valve seat core 200, which connects the gap 01 and the valve core cavity 201. The valve core sleeve 300 is disposed within the valve body 100, and the valve core sleeve 300 can move relative to the gap 01 to block or open the gap 01.

[0046] In this application, the electronic expansion valve also includes a valve needle assembly 400, which is movably disposed within the valve cavity 101. The valve seat core 200 has a valve port communicating with the valve core cavity 201. The valve needle assembly 400 is movable relative to the valve port. A valve core sleeve 300 is fitted over the valve needle assembly 400, and the valve core sleeve 300 has a flow cavity 301 communicating with the valve cavity 101. The valve port can communicate with the valve cavity 101 through the flow cavity 301. Thus, when fluid enters the flow cavity 301 through the valve cavity 101, it can enter the valve core cavity 201 through the valve port. At this time, the flow rate of the fluid passing through the valve port can be adjusted by the valve needle assembly 400, thereby realizing the flow regulation function of the electronic expansion valve.

[0047] Specifically, when fluid flows from the first connector 05 to the second connector 06, after entering the valve chamber 101 through the first connector 05, the fluid can flow into the flow chamber 301 through the flow hole 303 provided on the side wall of the valve core sleeve 300, thus achieving communication between the valve core sleeve 300 and the valve chamber 101. Fluid in the flow chamber 301 can enter the valve core chamber 201 through the valve port and flow out of the electronic expansion valve through the second connector 06. At this time, the fluid flows in the forward direction, and the fluid in the valve chamber 101 provides pressure to the valve core sleeve 300, causing the valve core sleeve 300 to block the interval 01. When fluid flows from the second connector 06 to the first connector 05, after entering the valve core chamber 201 through the second connector 06, the fluid can enter the interval 01 through the connecting hole 202. The pressure of the fluid causes the valve core sleeve 300 to move away from the interval 01, opening the interval 01. The fluid then enters the valve chamber 101 and flows out of the electronic expansion valve through the first connector 05. At this time, the fluid flows in the reverse direction. Fluids can flow in the forward or reverse direction through different flow paths to achieve special flow curves.

[0048] In related technologies, a sealing ring is provided on the valve core sleeve 300. The sealing ring is used to block or open the interval 01. However, due to the machining error or assembly error between the valve seat core 200 and the valve body 100, the inner ring and outer ring of the interval 01 may not be at the same height. At this time, there may be a sealing gap between the sealing ring and the interval 01, resulting in sealing failure. In this application, by setting the valve core sleeve 300 to slide and seal with one or both of the valve body 100 and the valve seat core 200, the valve core sleeve 300 can maintain a seal with one or both of the valve body 100 or the valve seat core 200 during the movement of the valve core sleeve 300. This eliminates the need for the valve core sleeve 300 to simultaneously abut against the inner and outer rings of the spaced 01 along the axis of the electronic expansion valve, thereby improving the adaptability of the valve core sleeve 300, overcoming the sealing failure that may occur due to simultaneous sealing in related technologies, reducing sealing failure caused by processing errors, lowering the risk of internal leakage of the electronic expansion valve, and ensuring the performance of the electronic expansion valve.

[0049] Preferably, the valve core sleeve 300 is in sliding sealing engagement with one of the valve body 100 or the valve seat core 200. This means that during movement, the valve core sleeve 300 can maintain a seal with one of the valve body 100 or the valve seat core 200. Simultaneously, when the valve core sleeve 300 moves towards the gap 01 under fluid pressure and blocks the gap 01, it engages in sealing engagement with the other of the valve body 100 or the valve seat core 200. This allows the valve core sleeve 300 to seal either the valve body 100 or the valve seat core 200 forming the gap 01. This configuration enables the valve core sleeve 300 to achieve asynchronous sealing of the inner and outer rings of the gap 01 when sealing it (i.e., when contacting the valve body 100 or the valve seat core 200), improving the adaptability of the valve core sleeve 300 to the gap 01.

[0050] Specifically, the valve body 100 also has a mounting cavity 102 communicating with the valve chamber 101, and the valve seat core 200 is disposed in the mounting cavity 102, with a gap 01 formed between the outer side wall of the valve seat core 200 and the inner side wall of the mounting cavity 102. This arrangement provides mounting space for the valve seat core 200 and simplifies the structure of the electronic expansion valve by forming a gap 01 between the valve seat core 200 and the valve body 100.

[0051] In some embodiments of this application, the inner diameter of the mounting cavity 102 is smaller than the inner diameter of the valve cavity 101. Thus, by setting the inner diameter of the mounting cavity 102 to be smaller than the inner diameter of the valve cavity 101, a stepped surface can be formed by the stepped structure formed between the mounting cavity 102 and the valve cavity 101, which facilitates contact and cooperation with the valve core sleeve 300, or sliding sealing cooperation with the valve core sleeve 300, to form a seal for the gap 01.

[0052] In this application, the interval 01 can be set as an annular interval, or the interval 01 can extend along the circumferential direction to form a non-closed shape.

[0053] Specifically, the valve core sleeve 300 has a sealing surface 302 at the end facing the gap 01. The sealing surface 302 is used to abut against the valve seat core 200 or the valve body 100 along the direction of the electronic expansion valve axis to achieve a sealing fit, so as to achieve a seal for the gap 01.

[0054] In some embodiments of this application, the sealing element 02 can be disposed between the outer walls of the valve core sleeve 300 and the valve seat core 200. The valve core sleeve 300 and the valve seat core 200 form a sliding seal through the sealing element 02. The sealing surface 302 of the valve core sleeve 300 is sealed and fitted with the outer ring of the gap 01. That is, the stepped surface formed between the valve cavity 101 and the mounting cavity 102 can achieve a contact seal. By sealing and fitting at two different locations, a stable seal for the gap 01 can be achieved, reducing the impact of assembly errors or dimensional tolerances on the seal between the valve seat core 200 and the valve body 100.

[0055] Furthermore, the inner diameter of the mounting cavity 102 is smaller than the inner diameter of the valve cavity 101. The valve core sleeve 300 has a first sealing section 310 facing the end of the gap 01. When the sealing element 02 is disposed between the outer wall of the valve core sleeve 300 and the valve seat core 200, the outer diameter of the first sealing section 310 gradually increases along the gap 01 towards the valve cavity 101. The side wall of the first sealing section 310 forms a sealing surface 302. When the valve core sleeve 300 is in sealing engagement with the valve body 100, the first sealing section 310 can extend into the gap 01, and the side wall of the first sealing section 310 is in sealing engagement with the port of the mounting cavity 102 facing the valve cavity 101. With this configuration, when the valve core sleeve 300 moves towards one end of the gap 01 under fluid pressure, the side wall of the first sealing section 310 can form a line seal with the outer ring of the gap 01, improving the sealing performance.

[0056] like Figures 2 to 5 As shown, in the first embodiment of this application, the interval 01 is an annular interval. The end of the valve seat core 200 near the valve cavity 101 protrudes from the interval 01 in the direction of the valve cavity 101 to adapt to the movement trajectory of the valve core sleeve 300, so as to facilitate the sliding sealing cooperation between the inner wall of the valve core sleeve 300 and the outer wall of the valve seat core 200. The outer wall of the valve seat core 200 has an annularly arranged first receiving groove 03. The sealing element 02 is disposed in the first receiving groove 03. In this way, during the movement of the valve core sleeve 300 relative to the valve seat core 200, the sealing element 02 can maintain a sliding seal with the valve seat core 200, thereby achieving a seal on the inner ring of the interval 01. After the outer wall of the first sealing section 310 abuts against the stepped surface, the sealing surface 302 can form a seal with the valve body 100, thereby achieving a seal on the outer ring of the interval 01.

[0057] like Figure 6 and Figure 7As shown, in the second embodiment of this application, the end of the valve seat core 200 near the valve cavity 101 protrudes beyond the gap 01 in the direction of the valve cavity 101 to adapt to the movement trajectory of the valve core sleeve 300, so that the inner wall of the valve core sleeve 300 slides and seals with the outer wall of the valve seat core 200, and the gap 01 is an annular gap. Unlike the first embodiment, the inner sidewall of the valve core sleeve 300 has an annularly arranged first receiving groove 03, and the sealing member 02 is disposed in the first receiving groove 03. In this way, during the movement of the valve core sleeve 300 relative to the valve seat core 200, the sealing member 02 can maintain a sliding seal with the valve seat core 200, thereby sealing the inner ring of the gap 01. After the outer sidewall of the first sealing section 310 abuts against the stepped surface, the sealing surface 302 can form a seal with the valve body 100, thereby sealing the outer ring of the gap 01.

[0058] In other embodiments of this application, the outer diameter of the end of the valve core sleeve 300 facing the interval 01 can be set to be greater than the outer diameter of the interval 01. In this way, the end face of the valve core sleeve 300 facing the interval can form a surface seal by abutting the stepped surface to block the interval 01.

[0059] In some feasible embodiments of this application, the sealing element 02 can be disposed between the inner wall of the valve core sleeve 300 and the valve body 100. The valve core sleeve 300 and the valve body 100 form a sliding seal through the sealing element 02. Thus, during the movement of the valve core sleeve 300 relative to the valve body 100, the sealing element 02 can prevent fluid leakage through the gap between the valve core sleeve 300 and the valve body 100, forming a sliding seal. Simultaneously, the sealing surface 302 of the valve core sleeve 300 and the outer periphery of the end face of the valve seat core 200 can achieve abutment sealing, with sealing cooperation at both locations to achieve a stable seal for the gap 01.

[0060] Furthermore, the valve core sleeve 300 has a second sealing section 320 facing the end of the gap 01. The inner diameter of the second sealing section 320 gradually decreases along the gap 01 towards the valve cavity 101. The sidewall of the second sealing section 320 forms a sealing surface 302. When the valve core sleeve 300 and the valve seat core 200 are in sealing engagement, the sealing surface 302 is used to seal with the end of the valve seat core 200 facing the valve cavity 101. With this configuration, when the valve core sleeve 300 blocks the gap 01, the sidewall of the second sealing section 320 can form a line seal with the inner ring of the gap 01, i.e., with the valve seat core 200, thereby improving the sealing performance.

[0061] like Figure 8 and Figure 9As shown, in the third embodiment of this application, the interval 01 is an annular interval. The inner wall of the mounting cavity 102 protrudes from the valve core sleeve 300 in the direction of the valve cavity 101 to adapt to the movement trajectory of the valve core sleeve 300, so that the outer wall of the valve core sleeve 300 slides and seals with the inner wall of the mounting cavity 102. The outer wall of the valve core sleeve 300 has an annularly arranged second receiving groove 04. The sealing element 02 is disposed in the second receiving groove 04. In this way, when the valve core sleeve 300 moves relative to the valve body 100, the sealing element 02 can maintain a sliding seal with the valve body 100, thereby sealing the outer ring of the interval 01. After the inner side wall of the second sealing section 320 abuts against the valve seat core 200, the sealing surface 302 can form a seal with the valve seat core 200, thereby sealing the inner ring of the interval 01.

[0062] like Figures 10 to 12 As shown, in the fourth embodiment of this application, the interval 01 is an annular interval. The inner wall of the mounting cavity 102 protrudes from the valve core sleeve 300 towards the valve cavity 101 to adapt to the movement trajectory of the valve core sleeve 300, so that the outer wall of the valve core sleeve 300 slides and seals with the inner wall of the mounting cavity 102. Unlike the third embodiment, the second receiving groove 04 is provided on the inner wall of the mounting cavity 102, and the sealing element 02 is provided in the second receiving groove 04. In this way, during the movement of the valve core sleeve 300 relative to the valve body 100, the sealing element 02 can maintain a sliding seal with the valve body 100, thereby sealing the outer ring of the interval 01. After the inner side wall of the second sealing section 320 abuts against the valve seat core 200, the sealing surface 302 can form a seal with the valve seat core 200, thereby sealing the inner ring of the interval 01.

[0063] In some other embodiments of this application, a sealing element 02 is provided between the valve core sleeve 300 and the inner wall of the valve body 100 and between the valve core sleeve 300 and the outer wall of the valve seat core 200, so as to achieve simultaneous sliding sealing between the valve core sleeve 300 and the valve body 100 and the valve seat core 200.

[0064] In other embodiments of this application, the outer diameter of the end of the valve core sleeve 300 facing the interval 01 can be smaller than the inner diameter of the interval 01. In this way, the end face of the valve core sleeve 300 facing the interval can form a surface seal with the valve seat core 200 to block the interval 01.

[0065] In some specific embodiments of this application, the valve core sleeve 300 has a sealing gasket 330 at the end facing the gap 01. The sealing gasket 330 has a sealing surface 302, and the hardness of the sealing gasket 330 is less than that of the valve body 100 and / or the valve seat core 200. By providing the sealing gasket 330, when the sealing surface 302 abuts against the inner or outer ring of the gap 01, the sealing gasket 330 can undergo a certain deformation, increasing the sealing area between the sealing surface 302 and the gap 01, and further improving the sealing performance of the electronic expansion valve.

[0066] Specifically, the sealing gasket 330 can be made of materials such as rubber.

[0067] Specifically, such as Figure 13 and Figure 14 As shown, in the fifth embodiment of this application, the sealing gasket 330 is sleeved on the valve core sleeve 300. The outer diameter of the sealing gasket 330 gradually increases along the interval 01 toward the valve cavity 101. The outer side wall of the portion where the outer diameter of the sealing gasket 330 changes forms a sealing surface 302. When the valve core sleeve 300 blocks the interval 01, the sealing gasket 330 and the valve body 100, that is, the stepped surfaces formed between the sealing gasket 330 and the valve cavity 101 and the mounting cavity 102, are sealed together.

[0068] In other embodiments of the sliding sealing fit between the valve core sleeve 300 and the valve body 100 in this application, the inner diameter of the sealing gasket 330 can gradually decrease along the interval 01 toward the valve cavity 101. The inner sidewall of the portion where the inner diameter of the sealing gasket 330 changes forms a sealing surface 302. When the valve core sleeve 300 blocks the interval 01, the sealing gasket 330 and the valve seat core 200 are sealed together, that is, the end face of the valve seat core 200 facing the valve cavity 101.

[0069] Furthermore, the valve needle assembly 400 includes a nut seat 410 and an adjusting valve needle 420. The adjusting valve needle 420 includes a screw and a valve needle body. The valve needle body is used to adjust the flow rate. The nut seat 410 is sleeved on the outside of the adjusting valve needle 420. The nut seat 410 and the screw of the adjusting valve needle 420 are threadedly engaged. The valve core sleeve 300 is sleeved on the outside of the nut seat 410 and is guidedly engaged with the nut seat 410. With this configuration, a fulcrum can be formed between the valve core sleeve 300 and the nut seat 410. When the valve core sleeve 300 and one of the valve seat cores 200 of the valve body 100 are in sliding seal engagement, another fulcrum can be formed. When the fluid flows in the forward direction, that is, after the fluid enters the valve cavity 101 through the first connecting pipe 05, the valve core sleeve 300 will be subjected to lateral impact force. The two fulcrums can reduce the problem of lateral displacement or jamming of the valve core sleeve 300 caused by fluid impact, ensure the stability of the valve core sleeve 300 when moving relative to the interval 01, and thus ensure the stability and effectiveness of the valve core sleeve 300 in sealing the interval 01.

[0070] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0072] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0073] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0074] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electronic expansion valve, characterized in that, The electronic expansion valve includes: Valve body (100), the valve body (100) having a valve cavity (101); A valve seat core (200) is disposed inside the valve body (100). The valve seat core (200) has a valve core cavity (201). There is a gap (01) between the outer wall of the valve seat core (200) and the inner wall of the valve body (100) to form a flow gap. The valve core cavity (201) can communicate with the valve cavity (101) through the gap (01). A valve core sleeve (300) is disposed inside the valve body (100) and is movable relative to the interval (01) to block or open the interval (01). The valve core sleeve (300) is in sliding sealing cooperation with the valve body (100) and / or the valve seat core (200).

2. The electronic expansion valve according to claim 1, characterized in that, The valve core sleeve (300) is in sliding sealing engagement with one of the valve body (100) or the valve seat core (200). When the valve core sleeve (300) blocks the interval (01), the valve core sleeve (300) is in sealing engagement with the other of the valve body (100) or the valve seat core (200).

3. The electronic expansion valve according to claim 1, characterized in that, A sealing element (02) is provided between the valve core sleeve (300) and the inner wall of the valve body (100), and / or between the valve core sleeve (300) and the outer wall of the valve seat core (200).

4. The electronic expansion valve according to claim 3, characterized in that, The valve body (100) also has a mounting cavity (102) communicating with the valve cavity (101), at least a portion of the valve seat core (200) is disposed in the mounting cavity (102), and the gap (01) is formed between the outer sidewall of the valve seat core (200) and the inner sidewall of the mounting cavity (102).

5. The electronic expansion valve according to claim 4, characterized in that, The inner wall of the valve core sleeve (300) is slidably sealed to the outer wall of the valve seat core (200). A first receiving groove (03) is provided on the inner wall of the valve core sleeve (300) or the outer wall of the valve seat core (200). The sealing element (02) is disposed in the first receiving groove (03).

6. The electronic expansion valve according to claim 5, characterized in that, The inner diameter of the mounting cavity (102) is smaller than the inner diameter of the valve cavity (101), and the valve seat core (200) protrudes from the interval (01) toward the valve cavity (101).

7. The electronic expansion valve according to claim 4, characterized in that, The outer wall of the valve core sleeve (300) slides and seals with the inner wall of the mounting cavity (102). A second receiving groove (04) is provided on the outer wall of the valve core sleeve (300) or the inner wall of the mounting cavity (102), and the sealing element (02) is disposed in the second receiving groove (04).

8. The electronic expansion valve according to claim 7, characterized in that, The inner diameter of the mounting cavity is smaller than the inner diameter of the valve cavity, and the inner wall of the mounting cavity (102) protrudes from the valve core sleeve (300) toward the valve cavity (101).

9. The electronic expansion valve according to claim 1, characterized in that, The interval (01) is circular.

10. The electronic expansion valve according to claim 4, characterized in that, The valve core sleeve (300) has a sealing surface (302) at one end facing the interval (01). The sealing surface (302) is used to seal with the valve body (100) or the valve seat core (200). The inner diameter of the mounting cavity (102) is smaller than the inner diameter of the valve cavity (101). The valve core sleeve (300) has a first sealing section (310) at one end facing the interval (01). The outer diameter of the first sealing section (310) gradually increases along the interval (01) toward the valve cavity (101). The sidewall of the first sealing section (310) forms the sealing surface (302). When the valve core sleeve (300) seals with the valve body (100), the sidewall of the first sealing section (310) seals with the port of the mounting cavity (102) facing the valve cavity (101).

11. The electronic expansion valve according to claim 4, characterized in that, The valve core sleeve (300) has a sealing surface (302) at one end facing the interval (01). The sealing surface (302) is used to seal with the valve body (100) or the valve seat core (200). The inner diameter of the mounting cavity (102) is smaller than the inner diameter of the valve cavity (101). The valve core sleeve (300) has a second sealing section (320) at one end facing the interval (01). The inner diameter of the second sealing section (320) gradually decreases along the interval (01) toward the valve cavity (101). The sidewall of the second sealing section (320) forms the sealing surface (302). When the valve core sleeve (300) seals with the valve seat core (200), the sealing surface (302) is used to seal with the end of the valve seat core (200) facing the valve cavity (101).

12. The electronic expansion valve according to claim 10 or 11, characterized in that, The valve core sleeve (300) has a sealing gasket (330) at one end facing the interval (01), the sealing gasket (330) has the sealing surface (302), and the hardness of the sealing gasket (330) is less than that of the valve body (100) and / or the valve seat core (200).

13. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve also has a valve needle assembly (400) movably disposed within the valve cavity (101), a valve seat core (200) having a valve port communicating with the valve core cavity (201), the valve needle assembly (400) being movable relative to the valve port, a valve core sleeve (300) being sleeved on the outside of the valve needle assembly (400), the valve core sleeve (300) having a flow cavity (301), and the valve port being able to communicate with the valve cavity (101) through the flow cavity (301).

14. The electronic expansion valve according to claim 13, characterized in that, The valve needle assembly (400) includes a nut seat (410) and an adjusting valve needle (420). The nut seat (410) is sleeved on the outside of the adjusting valve needle (420). The nut seat (410) and the adjusting valve needle (420) are threaded together. The valve core sleeve (300) is guided to the nut seat (410).

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