Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve body provided with a first connector, a valve cavity, a valve port and a second connector which are communicated in sequence. The piston component is movably arranged in the valve cavity so as to block or open the valve port, and a first rotation stopping structure is arranged on the outer side wall of the piston component; the guide sleeve is located in the valve cavity and comprises a body part and a limiting ring, the end, facing the valve port, of the body part is of an opening structure, the end, away from the valve port, of the piston component is movably arranged in the body part in a penetrating mode and matched with the body part in a guiding mode, and the limiting ring is arranged on the body part and arranged on the periphery of the piston component in a sleeving mode; a third rotation stopping structure is arranged on the inner side wall of the limiting ring and matched with the first rotation stopping structure in a rotation stopping mode so as to prevent the piston component from rotating in the moving process. According to the scheme, the problem that in the prior art, the machining process is complex due to the fact that a rotation stopping structure is arranged on the inner side wall of the valve body can be solved.

Description

Technical Field

[0001] The utility model relates to the field of valves, and in particular to an electronic expansion valve. Background Art

[0002] In the prior art, electronic expansion valves are widely used in refrigeration systems to precisely control the flow of refrigerant.

[0003] An electronic expansion valve typically includes a valve body, a screw, a piston assembly, and a sealing portion. The valve body is provided with a first interface, a valve cavity, a valve port, and a second interface, which are sequentially connected. The piston assembly is movably disposed within the valve cavity to block or open the valve port. The screw is rotatably disposed within the valve cavity and is driven and connected to the piston assembly to move the piston. The sealing portion is disposed within the valve cavity and divides the valve cavity into a first chamber and a second chamber. The sealing portion seals with the piston assembly, and the valve port and the second interface are respectively connected to the first chamber. When the valve port is in an open state, the first interface and the second interface are connected to the valve cavity through the valve port. When the valve port is in a blocked state, the first interface and the second interface are separated.

[0004] In related art, to reduce the possibility of piston components rotating during movement, a rotation-stopping structure is typically provided on the inner sidewall of the valve body. The rotation-stopping structure cooperates with the piston component to prevent rotation during movement. However, providing a rotation-stopping structure on the inner sidewall of the valve body is relatively complex in its manufacturing process. Utility Model Content

[0005] The utility model provides an electronic expansion valve to solve the problem in the prior art that a rotation-stopping structure is provided on the inner side wall of a valve body, resulting in a relatively complicated processing process.

[0006] The utility model provides an electronic expansion valve, which includes: a valve body, having a first interface, a valve cavity, a valve port and a second interface connected in sequence; a piston component, movably arranged in the valve cavity to seal or open the valve port, when the piston component seals the valve port, the first interface and the second interface are separated; when the piston component opens the valve port, the first interface and the second interface are connected through the valve port, and a first anti-rotation structure is provided on the outer wall of the piston component; a guide sleeve, located in the valve cavity, the guide sleeve includes a main body and a limiting ring, one end of the main body facing the valve port is an open structure, one end of the piston component away from the valve port is movably passed through the main body and matched with the main body guide, the limiting ring is arranged on the main body and sleeved on the outer circumference of the piston component, the inner side wall of the limiting ring is provided with a third anti-rotation structure, the third anti-rotation structure is matched with the first anti-rotation structure to prevent the piston component from rotating during movement.

[0007] Furthermore, the first anti-rotation structure includes a first anti-rotation plane, which is parallel to the axis of the piston component. The third anti-rotation structure includes a third anti-rotation plane, which is parallel to the axis of the piston component. Along the circumference of the piston component, the distance between the end point of the first anti-rotation plane and the axis of the piston component is greater than the minimum distance between the third anti-rotation plane and the axis of the piston component.

[0008] Furthermore, a first guide structure is provided on the outer wall of the piston component, the first guide structure extends along the axial direction of the piston component, and the first guide structure and the first anti-rotation structure are distributed along the circumference of the piston component; a third guide structure is provided on the inner wall of the limiting ring, the third guide structure and the third anti-rotation structure are distributed along the circumference of the limiting ring, and the third guide structure is guided and cooperated with the first guide structure.

[0009] Furthermore, the first guide structures and the first anti-rotation structures are alternately distributed along the circumference of the piston component, and the number of the first anti-rotation structures is 6 to 12.

[0010] Furthermore, the electronic expansion valve also includes: a sealing portion, which is arranged in the guide sleeve and is annularly arranged on the outer periphery of the piston component, the sealing portion is sealed and matched with the circumferential surface of the piston component, the sealing portion, the guide sleeve and the piston component cooperate to separate the valve cavity into a first chamber and a second chamber, and the first interface is connected to the first chamber; a second anti-rotation structure is provided on the inner side wall of the sealing portion, and the first anti-rotation structure is anti-rotation matched with the second anti-rotation structure to prevent the piston component from rotating during movement.

[0011] Furthermore, a mounting groove is provided on the inner side wall of the guide sleeve, and the mounting groove is arranged in a ring shape along the circumference of the guide sleeve on the inner side wall of the guide sleeve. Along the radial direction of the sealing part, the outer end of the sealing part is installed in the mounting groove, and the inner end of the sealing part protrudes out of the mounting groove toward the direction of the piston component and abuts against the piston component.

[0012] Furthermore, the main body includes a guide cavity and an installation cavity which are connected in sequence along the axial direction. The cross-sectional area of ​​the guide cavity is smaller than the cross-sectional area of ​​the installation cavity. The installation cavity is located on the side of the guide cavity close to the valve port. The end of the installation cavity away from the guide cavity is an open structure. The guide cavity is coordinated with the piston component guide. The limit ring is arranged at the end of the installation cavity away from the guide cavity. The limit ring cooperates with the main body to form a mounting groove.

[0013] Furthermore, the sealing part includes: a sealing gasket, which is arranged in an annular shape on the outer periphery of the piston part along the circumference of the piston part, a second anti-rotation structure is arranged on the inner side wall of the sealing gasket, and an annular recess is also arranged on the inner side wall of the sealing gasket; and a sealing ring, which is arranged in the annular recess.

[0014] Furthermore, along the radial direction of the piston component, the gap between the sealing gasket and the piston component is smaller than the gap between the limiting ring and the piston component.

[0015] Furthermore, along the radial direction of the sealing gasket, the size of the annular recess in the axial direction gradually increases from the inner end to the outer end.

[0016] Furthermore, the sealing gasket includes at least two washers, and the multiple washers are spaced and relatively distributed along the axial direction of the piston component. An annular recess is formed between two adjacent washers, and each annular recess is correspondingly provided with a sealing ring.

[0017] Furthermore, along the radial direction of the sealing gasket, the dimension of the inner end of the sealing gasket in the axial direction is smaller than the dimension of the outer end of the sealing gasket in the axial direction.

[0018] Furthermore, the first anti-rotation structure includes a first anti-rotation plane, which is parallel to the axis of the piston component. The second anti-rotation structure includes a second anti-rotation plane, which is parallel to the axis of the piston component. Along the circumference of the piston component, the distance between the end point of the first anti-rotation plane and the axis of the piston component is greater than the minimum distance between the second anti-rotation plane and the axis of the piston component.

[0019] Furthermore, a first guide structure is provided on the outer side wall of the piston component, the first guide structure extends along the axial direction of the piston component, and the first guide structure and the first anti-rotation structure are distributed along the circumference of the piston component; a second guide structure is provided on the inner side wall of the sealing part, the second guide structure and the second anti-rotation structure are distributed along the circumference of the sealing part, and the second guide structure is guided and cooperated with the first guide structure.

[0020] Furthermore, a balancing channel is provided on the piston component. When the piston component blocks the valve port, one end of the balancing channel is communicated with the second interface, and the other end of the balancing channel is communicated with the second chamber.

[0021] By applying the technical solution of the present invention, a first anti-rotation structure and a third anti-rotation structure that cooperate with each other are respectively provided on the piston component and the limiting ring, which can prevent the possibility of rotation of the piston component during movement, ensure the linear movement of the piston component, and improve the control accuracy and reliability of the electronic expansion valve. Specifically, the first anti-rotation structure is provided on the outer wall of the piston component, and the third anti-rotation structure is provided on the inner wall of the limiting ring, so that the processing process of the first anti-rotation structure and the third anti-rotation structure is more convenient. In addition, the main body cooperates with the piston component guide to improve the smoothness of the movement of the piston component. This solution integrates the main body and the limiting ring to form a guide sleeve, so that the guide sleeve has both the guiding function and the anti-rotation function of the piston component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic structural diagram of an electronic expansion valve according to an embodiment of the present utility model is shown;

[0024] Figure 2 A cross-sectional view of the structure of the guide sleeve and the piston component provided in accordance with an embodiment of the present utility model is shown;

[0025] Figure 3 Shown Figure 2 Schematic diagram of the local structure at A in the middle;

[0026] Figure 4 A schematic diagram of the structure of the guide sleeve and the piston component provided in accordance with an embodiment of the present utility model is shown;

[0027] Figure 5 A schematic structural diagram of a piston component provided according to an embodiment of the present utility model is shown;

[0028] Figure 6 A schematic structural diagram of a sealing gasket provided according to an embodiment of the present utility model is shown;

[0029] Figure 7 Shows a cross-sectional view of a guide sleeve provided according to an embodiment of the utility model;

[0030] Figure 8 A schematic structural diagram of a limit ring provided according to an embodiment of the present utility model is shown;

[0031] Figure 9 A bottom view of the partial structure of an electronic expansion valve provided according to an embodiment of the utility model is shown.

[0032] The above drawings include the following reference numerals:

[0033] 10. Valve body;

[0034] 101, first interface; 102, valve chamber; 1021, first chamber; 1022, second chamber;

[0035] 103, valve port; 104, second interface;

[0036] 20. Piston parts;

[0037] 201. First anti-rotation structure; 202. First guide structure;

[0038] 21. Piston sleeve; 22. Sealing ring; 23. Connecting rod;

[0039] 30. Sealing part;

[0040] 301, second anti-rotation structure; 302, second guide structure;

[0041] 31. Sealing gasket; 3101. Annular recess; 3102. Inner end; 3013. Outer end;

[0042] 32. Sealing ring;

[0043] 40. Guide sleeve;

[0044] 401. Third anti-rotation structure; 402. Mounting slot;

[0045] 403. Guide cavity; 404. Mounting cavity; 405. Third guide structure;

[0046] 41. Main body; 42. Limiting ring;

[0047] 51. Driving unit; 52. Screw. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] like Figures 1 to 9As shown, an embodiment of the present invention provides an electronic expansion valve, which includes a valve body 10, a piston component 20, a guide sleeve 40, a drive unit 51 and a screw 52. The valve body 10 has a first interface 101, a valve cavity 102, a valve port 103 and a second interface 104 that are connected in sequence; the piston component 20 is movably arranged in the valve cavity 102 to block or open the valve port 103. When the piston component 20 blocks the valve port 103, the first interface 101 and the second interface 104 are separated; when the piston component 20 opens the valve port 103, the first interface 101 and the second interface 104 are connected through the valve port 103. A first anti-rotation structure 201 is provided on the outer wall of the piston component 20; the guide sleeve 40 is located in the valve cavity. 102, the guide sleeve 40 includes a body 41 and a stop ring 42. The end of the body 41 facing the valve port 103 is open. The end of the piston member 20 away from the valve port 103 is movably inserted into the body 41 and guided by the body 41. The stop ring 42 is provided on the body 41 and sleeved around the outer circumference of the piston member 20. The inner sidewall of the stop ring 42 is provided with a third stop structure 401, which cooperates with the first stop structure 201 to prevent the piston member 20 from rotating during movement. The drive unit 51 is provided on the valve body 10, and the screw 52 is rotatably provided in the valve cavity 102. The screw 52 is threadedly connected to the piston member 20.

[0050] By applying the technical solution of the present invention, a first anti-rotation structure 201 and a third anti-rotation structure 401 that cooperate with each other are respectively provided on the piston component 20 and the limiting ring 42, which can prevent the piston component 20 from rotating during movement, ensure the linear movement of the piston component 20, and improve the control accuracy and reliability of the electronic expansion valve. Specifically, the first anti-rotation structure 201 is provided on the outer wall of the piston component 20, and the third anti-rotation structure 401 is provided on the inner wall of the limiting ring 42, so that the processing process of the first anti-rotation structure 201 and the third anti-rotation structure 401 is more convenient. In addition, the main body 41 cooperates with the piston component 20 to guide and improve the smoothness of the movement of the piston component 20. This solution integrates the main body 41 and the limiting ring 42 to form a guide sleeve 40, so that the guide sleeve 40 has both the guiding function and the anti-rotation function of the piston component 20.

[0051] like Figure 9As shown, in the embodiment of this solution, the first anti-rotation structure 201 includes a first anti-rotation plane, which is parallel to the axis of the piston component 20. The third anti-rotation structure 401 includes a third anti-rotation plane, which is parallel to the axis of the piston component 20. Along the circumference of the piston component 20, the distance a between the endpoint of the first anti-rotation plane and the axis of the piston component 20 is greater than the minimum distance b between the third anti-rotation plane and the axis of the piston component 20. Specifically, the two ends of the third anti-rotation plane extend to the two end faces in the axial direction of the limit ring 42. Such a configuration has a simple structure, facilitates the processing of the limit ring 42, and improves the anti-rotation effect of the limit ring 42.

[0052] In the embodiment of this solution, the axial dimension of the limiting ring 42 is not less than 2 mm, and can be specifically set to 2 mm, 2.5 mm or 3 mm.

[0053] Among them, the minimum distance b between the third anti-rotation plane and the axis of the piston component 20 is: the length of a line segment passing through the axis of the piston component 20 and perpendicular to the third anti-rotation plane, and the two endpoints of the line segment are respectively on the axis of the piston component 20 and the third anti-rotation plane.

[0054] Specifically, when the third anti-rotation plane is parallel to the first anti-rotation plane, the distance d between the two is less than or equal to 0.25 mm. This arrangement can ensure the anti-rotation effect between the third anti-rotation plane and the first anti-rotation plane.

[0055] like Figure 4 and Figure 5 As shown, further, a first guide structure 202 is provided on the outer side wall of the piston component 20, and the first guide structure 202 extends along the axial direction of the piston component 20. It can be understood that the first guide structure 202 extends along the axial direction of the piston component 20. Figure 8 and Figure 9 As shown, a third guide structure 405 is provided on the inner sidewall of the retaining ring 42. The third guide structure 405 extends along the axis of the retaining ring 42. The third guide structure 405 cooperates with the first guide structure 202. The cooperation between the first guide structure 202 and the third guide structure 405 ensures the stability of the piston component 20 during movement and reduces the possibility of deviation or vibration.

[0056] The first guide structure 202 and the first rotation-stopping structure 201 are distributed along the circumference of the piston component 20, while the third guide structure 405 and the third rotation-stopping structure 401 are distributed along the circumference of the stop ring 42. The circumferential distribution of the first guide structure 202 and the first rotation-stopping structure 201 along the piston component 20 optimizes the utilization of the outer sidewall of the piston component 20. Similarly, the circumferential distribution of the third guide structure 405 and the third rotation-stopping structure 401 along the stop ring 42 optimizes the utilization of the inner sidewall of the stop ring 42.

[0057] Specifically, the first guide structure 202 includes a first guide arc surface, and the third guide structure 405 includes a third guide arc surface. The first guide arc surface and the third guide arc surface are parallel to and abut against each other.

[0058] In this solution, there are multiple first anti-rotation structures 201, multiple first guide structures 202, multiple third anti-rotation structures 401, and multiple third guide structures 405.

[0059] In some embodiments of the present solution, a plurality of first anti-rotation structures 201 are distributed along the circumference of the piston component 20 , and two adjacent first anti-rotation structures 201 are connected end to end along the circumference of the piston component 20 .

[0060] In the embodiment of the present solution, there is a gap between two adjacent first anti-rotation structures 201 in the circumferential direction of the piston component 20 .

[0061] In the embodiment of this solution, the first anti-rotation planes and the first guide arc surfaces are alternately connected along the circumference of the piston component 20. Specifically, the first anti-rotation planes can be obtained by milling the outer surface of the piston component 20 having a cylindrical outer wall, and the portion between two adjacent first anti-rotation planes is the first guide arc surface.

[0062] Similarly, the third anti-rotation plane and the third guide arc surface are alternately connected along the circumference of the limit ring 42. The third anti-rotation plane can be obtained by milling the inner surface of the limit ring 42 having a cylindrical inner side wall, and the portion between two adjacent third anti-rotation planes is the third guide arc surface.

[0063] In the embodiment of this solution, the number of the first anti-rotation structures 201 is 6 to 12.

[0064] Specifically, the number of first anti-rotation planes is 6 to 12. When the number of first anti-rotation planes is less than 6, there may be an excessive gap between the first anti-rotation plane and the third anti-rotation plane, affecting the sealing effect between the piston component 20 and the limiting ring 42; when the number of first anti-rotation planes is greater than 12, the contour of the outer surface of the piston component 20 becomes closer to a circle, affecting the anti-rotation effect of the limiting ring 42 on the piston component 20. In this solution, the number of first anti-rotation structures 201 is set to 6 to 12, which can ensure both the sealing between the limiting ring 42 and the piston component 20 and the anti-rotation effect of the limiting ring 42 on the piston component 20.

[0065] like Figures 2 to 6 As shown, the electronic expansion valve further includes a sealing portion 30, which is disposed within a guide sleeve 40 and annularly disposed on the outer periphery of the piston member 20. The sealing portion 30 seals against the circumference of the piston member 20. The sealing portion 30, the guide sleeve 40, and the piston member 20 cooperate to separate the valve cavity 102 into a first chamber 1021 and a second chamber 1022. The first interface 101 communicates with the first chamber 1021. A second anti-rotation structure 301 is disposed on the inner sidewall of the sealing portion 30. The first anti-rotation structure 201 and the second anti-rotation structure 301 cooperate to prevent the piston member 20 from rotating during movement. The mutually cooperating first and second anti-rotation structures 201, 301 are disposed on the outer sidewall of the piston member 20 and the inner sidewall of the sealing portion 30, respectively, to reduce rotation of the piston member 20 during movement, ensure linear movement of the piston member 20, and improve the control accuracy and reliability of the valve.

[0066] Furthermore, the second anti-rotation structure 301 is adapted to the first anti-rotation structure 201, enabling the contour of the inner wall of the sealing portion 30 to closely match the contour of the outer wall of the piston component 20. This close fit increases the sealing contact area, significantly improving the sealing effect and reducing refrigerant leakage. This arrangement improves the sealing effect of the sealing portion 30 while ensuring that the sealing portion 30 prevents the piston component 20 from rotating.

[0067] Specifically, one end of the guide sleeve 40 is sealed, while the other end is open, with the open end located near the valve port 103. The piston assembly 20 includes a piston sleeve 21, a sealing ring 22, and a connecting rod 23. One end of the piston sleeve 21 is inserted into the guide sleeve 40 through the opening of the guide sleeve 40. The sealing ring 22 is annularly arranged around the outer periphery of the end of the piston sleeve 21 located near the valve port 103 and located within the valve cavity 102. The sealing ring 22 is configured to seal against the valve port 103. The interconnected space within the piston sleeve 21 and the guide sleeve 40 forms a second chamber 1022, while the space outside the piston sleeve 21 and the guide sleeve 40 forms a first chamber 1021. The connecting rod 23 is disposed within the piston sleeve 21 and is threadedly connected to the screw 52.

[0068] In an embodiment of the present invention, a mounting groove 402 is provided on the inner sidewall of the guide sleeve 40. The mounting groove 402 is annularly arranged on the inner sidewall of the guide sleeve 40 along the circumference of the guide sleeve 40. The outer end 3013 of the sealing portion 30 is mounted in the mounting groove 402 along the radial direction of the sealing portion 30. The inner end 3102 of the sealing portion 30 protrudes out of the mounting groove 402 toward the piston component 20 and abuts against the piston component 20. The protruding design of the inner end 3102 of the sealing portion 30 allows for a closer contact between the inner end 3102 and the piston component 20. In addition, the provision of the mounting groove 402 simplifies the installation process of the sealing portion 30, making the installation of the sealing portion 30 faster and more convenient, enhancing the fixing stability of the sealing portion 30 on the guide sleeve 40, and reducing displacement or falling off due to vibration or pressure changes.

[0069] It can be understood that the second anti-rotation structure 301 is provided on the side wall of the inner end 3102 of the sealing portion 30 .

[0070] like Figure 3 and Figure 7 As shown, the main body 41 further includes a guide cavity 403 and a mounting cavity 404, which are sequentially connected along the axial direction. The cross-sectional area of ​​the guide cavity 403 is smaller than that of the mounting cavity 404. The mounting cavity 404 is located on the side of the guide cavity 403 that is close to the valve port 103. The end of the mounting cavity 404 that is away from the guide cavity 403 is open. The guide cavity 403 is in a guided and coordinated manner with the piston component 20. A retaining ring 42 is disposed at the end of the mounting cavity 404 that is away from the guide cavity 403. The retaining ring 42 cooperates with the main body 41 to form a mounting groove 402. The mounting cavity 404 has a larger cross-sectional area and is close to the valve port 103, which provides sufficient space for the sealing portion 30 to be installed. The retaining ring 42 is disposed at the end of the mounting cavity 404 that is away from the guide cavity 403 and cooperates with the main body 41 to form a mounting groove 402, which provides a position-limiting function for the sealing portion 30 and improves the ease of assembly of the sealing portion 30 with the guide sleeve 40.

[0071] In the embodiment of this solution, the limiting ring 42 is welded to the main body 41. This arrangement can improve the mechanical strength and stability of the overall structure of the guide sleeve 40.

[0072] like Figure 3 and Figure 6 As shown, the sealing portion 30 further includes a sealing gasket 31 and a sealing ring 32. The sealing gasket 31 is annularly arranged on the outer periphery of the piston component 20 along the circumference thereof. The second rotation-stopping structure 301 is provided on the inner sidewall of the sealing gasket 31. The inner sidewall of the sealing gasket 31 is also provided with an annular recess 3101. The sealing ring 32 is disposed within the annular recess 3101. The combination of the sealing gasket 31 and the sealing ring 32 provides a dual sealing effect, enhancing the sealing performance of the sealing portion 30.

[0073] In this embodiment, the second anti-rotation structure 301 is disposed on the inner sidewall of the sealing gasket 31. This arrangement can improve the convenience of processing the second anti-rotation structure 301. The sealing ring 32 is disposed in the annular recess 3101, which can improve the stability of the sealing ring 32 and reduce movement or displacement caused by vibration or pressure fluctuations, thereby improving the stability of the sealing ring 32.

[0074] In the embodiment of this solution, the sealing gasket 31 is a polytetrafluoroethylene sealing gasket.

[0075] Furthermore, along the radial direction of the piston member 20, the gap between the sealing gasket 31 and the piston member 20 is smaller than the gap between the retaining ring 42 and the piston member 20. This arrangement can reduce the possibility of the sealing ring 32 falling out of the sealing gasket 31 through the annular recess 3101, thereby improving the stability of the sealing ring 32.

[0076] Furthermore, along the radial direction of the sealing gasket 31, the axial dimension of the annular recess 3101 gradually increases from the inner end 3102 to the outer end 3013. This arrangement makes it less likely that the sealing ring 32 will be squeezed out of the annular recess 3101 when under pressure, further improving the reliability of the entire sealing portion 30.

[0077] In some embodiments of the present solution, one sealing gasket 31 is provided corresponding to one sealing ring 32 , that is, along the radial direction of the sealing gasket, the inner end of the sealing gasket 31 is an open structure, and the outer end is a blocking structure.

[0078] In this embodiment, the sealing gasket 31 comprises at least two washers spaced relative to each other along the axis of the piston component 20. An annular recess 3101 is formed between two adjacent washers, and each annular recess 3101 corresponds to a sealing ring 32. By providing multiple sealing gaskets 31, even if one sealing ring 32 fails, the remaining sealing gaskets 31 can still provide a seal, enhancing the overall sealing reliability. Furthermore, the distribution of multiple sealing gaskets 31 along the axis helps to more evenly distribute pressure, reduce local stress concentration, and thus extend the service life of the sealing gaskets 31.

[0079] Specifically, a second anti-rotation structure 301 is provided on the inner side wall of each sealing gasket 31, and the second anti-rotation structure 301 is provided along the axial direction through the inner side wall of the sealing gasket 31. Such a configuration can improve the convenience of processing the second anti-rotation structure 301.

[0080] In the embodiment of this solution, two sealing pads 31 are provided. The two sealing pads 31 have the same shape and are symmetrically arranged relative to the sealing ring 32 .

[0081] Furthermore, along the radial direction of the sealing gasket 31, the inner end 3102 of the sealing gasket 31 is smaller in the axial direction than the outer end 3013 of the sealing gasket 31. The smaller inner end 3102 of the sealing gasket 31 reduces the contact area with the piston component 20, thereby reducing friction with the piston component 20 and improving the smoothness of movement of the piston component 20. The larger outer end 3013 of the sealing gasket 31 in the axial direction improves the structural stability of the sealing gasket 31.

[0082] Specifically, the end surface of the sealing gasket 31, distal from the sealing ring 32, comprises a first stepped surface, a first connecting surface, and a second stepped surface, which are interconnected. The first connecting surface extends along the axis, the first stepped surface is located inward of the second stepped surface, and the portion of the sealing gasket 31 corresponding to the second stepped surface is larger than the portion of the sealing gasket 31 corresponding to the first stepped surface. This arrangement makes the first and second stepped surfaces both flat, facilitating machining of the sealing gasket 31.

[0083] Furthermore, the end surface of the sealing gasket 31 near the sealing ring 32 includes a flat surface and an arcuate surface connected sequentially from the inside to the outside. This arrangement makes the shape of the arcuate surface more easily adaptable to the circumference of the sealing ring 32, thereby improving the stability of the sealing ring 32.

[0084] Specifically, the second stop structure 301 includes a second stop plane, which is parallel to the axis of the piston component 20. Along the circumference of the piston component 20, the distance between the end point of the first stop plane and the axis of the piston component 20 is greater than the minimum distance between the second stop plane and the axis of the piston component 20.

[0085] Furthermore, a second guide structure 302 is provided on the inner side wall of the sealing portion 30. The second guide structure 302 and the second anti-rotation structure 301 are distributed along the circumference of the sealing portion 30. The second guide structure 302 is guided and matched with the first guide structure 202. In this embodiment, the second guide structure 302 includes a second guide arc surface, which is guided and matched with the first guide arc surface.

[0086] Specifically, when processing the second anti-rotation plane, the sealing gasket 31 having a cylindrical inner surface is milled to obtain the second anti-rotation plane, and a second guide arc surface is formed between two adjacent second anti-rotation planes.

[0087] In the embodiment of this solution, a plurality of second anti-rotation planes and second guide arc surfaces are provided on each sealing gasket 31 , and the second anti-rotation planes and the second guide arc surfaces are alternately connected.

[0088] In the embodiment of this scheme, the same first anti-rotation plane corresponds to a third anti-rotation surface on the limiting ring 42 and a second anti-rotation plane on the sealing gasket 31; the same guide arc surface corresponds to the third guide arc surface on the limiting ring 42 and the second guide arc surface on the sealing gasket 31.

[0089] like Figure 1 As shown, further, in an embodiment of this solution, a balancing channel is provided on the piston component 20. When the piston component 20 blocks the valve port 103, one end of the balancing channel communicates with the second port 104, and the other end of the balancing channel communicates with the second chamber 1022. This arrangement can balance the pressure between the second port 104 and the second chamber 1022, thereby improving the smoothness of the movement of the piston component 20.

[0090] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0091] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0092] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0093] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0094] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: The valve body (10) has a first interface (101), a valve cavity (102), a valve port (103) and a second interface (104) which are connected in sequence; A piston component (20) is movably arranged in the valve cavity (102) to block or open the valve port (103); when the piston component (20) blocks the valve port (103), the first interface (101) and the second interface (104) are separated; when the piston component (20) opens the valve port (103), the first interface (101) and the second interface (104) are communicated through the valve port (103); a first anti-rotation structure (201) is provided on the outer side wall of the piston component (20); A guide sleeve (40) is located in the valve cavity (102), and the guide sleeve (40) includes a main body (41) and a limiting ring (42). The end of the main body (41) facing the valve port (103) is an open structure, and the end of the piston component (20) away from the valve port (103) is movably inserted into the main body (41) and guided by the main body (41). The limiting ring (42) is arranged on the main body (41) and sleeved on the outer periphery of the piston component (20). The inner side wall of the limiting ring (42) is provided with a third anti-rotation structure (401), and the third anti-rotation structure (401) is anti-rotationally matched with the first anti-rotation structure (201) to prevent the piston component (20) from rotating during the movement.

2. The electronic expansion valve according to claim 1, characterized in that: The first anti-rotation structure (201) includes a first anti-rotation plane, which is parallel to the axis of the piston component (20); the third anti-rotation structure (401) includes a third anti-rotation plane, which is parallel to the axis of the piston component (20); along the circumference of the piston component (20), the distance between the end point of the first anti-rotation plane and the axis of the piston component (20) is greater than the minimum distance between the third anti-rotation plane and the axis of the piston component (20).

3. The electronic expansion valve according to claim 1, characterized in that: A first guide structure (202) is provided on the outer side wall of the piston component (20), the first guide structure (202) extends along the axial direction of the piston component (20), and the first guide structure (202) and the first anti-rotation structure (201) are distributed along the circumference of the piston component (20); A third guide structure (405) is provided on the inner side wall of the limiting ring (42); the third guide structure (405) and the third anti-rotation structure (401) are distributed along the circumference of the limiting ring (42); and the third guide structure (405) is guided and matched with the first guide structure (202).

4. The electronic expansion valve according to claim 3, characterized in that: The first guide structures (202) and the first anti-rotation structures (201) are alternately distributed along the circumference of the piston component (20), and the number of the first anti-rotation structures (201) is 6 to 12.

5. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further includes: a sealing portion (30) disposed in the guide sleeve (40) and annularly disposed on the outer periphery of the piston component (20); the sealing portion (30) and the peripheral surface of the piston component (20) are in sealing cooperation; the sealing portion (30), the guide sleeve (40) and the piston component (20) cooperate to separate the valve cavity (102) into a first chamber (1021) and a second chamber (1022); the first interface (101) is in communication with the first chamber (1021); A second anti-rotation structure (301) is provided on the inner side wall of the sealing portion (30), and the first anti-rotation structure (201) cooperates with the second anti-rotation structure (301) to prevent the piston component (20) from rotating during movement.

6. The electronic expansion valve according to claim 5, characterized in that: The inner side wall of the guide sleeve (40) is provided with a mounting groove (402), and the mounting groove (402) is annularly arranged on the inner side wall of the guide sleeve (40) along the circumference of the guide sleeve (40). Along the radial direction of the sealing portion (30), the outer end (3013) of the sealing portion (30) is installed in the mounting groove (402), and the inner end (3102) of the sealing portion (30) protrudes from the mounting groove (402) in the direction of the piston component (20) and abuts against the piston component (20).

7. The electronic expansion valve according to claim 6, characterized in that: The main body (41) includes a guide cavity (403) and an installation cavity (404) connected in sequence along the axial direction. The cross-sectional area of ​​the guide cavity (403) is smaller than the cross-sectional area of ​​the installation cavity (404). The installation cavity (404) is located on the side of the guide cavity (403) close to the valve port (103). The end of the installation cavity (404) away from the guide cavity (403) is an open structure. The guide cavity (403) is guided and matched with the piston component (20). The limiting ring (42) is arranged at the end of the installation cavity (404) away from the guide cavity (403). The limiting ring (42) cooperates with the main body (41) to form the installation groove (402).

8. The electronic expansion valve according to claim 5, characterized in that: The sealing portion (30) comprises: A sealing gasket (31) is annularly arranged on the outer periphery of the piston component (20) along the circumference of the piston component (20), the second anti-rotation structure (301) is arranged on the inner side wall of the sealing gasket (31), and an annular recess (3101) is also arranged on the inner side wall of the sealing gasket (31); The sealing ring (32) is arranged in the annular recess (3101).

9. The electronic expansion valve according to claim 8, characterized in that: Along the radial direction of the piston component (20), the gap between the sealing gasket (31) and the piston component (20) is smaller than the gap between the limiting ring (42) and the piston component (20).

10. The electronic expansion valve according to claim 8, characterized in that: Along the radial direction of the sealing gasket (31), the size of the annular recess (3101) in the axial direction gradually increases from the inner end (3102) to the outer end (3013).

11. The electronic expansion valve according to claim 8, characterized in that: The sealing gasket (31) includes at least two gaskets, and the plurality of gaskets are spaced and relatively distributed along the axial direction of the piston component (20). An annular recess (3101) is formed between two adjacent gaskets, and each annular recess (3101) is correspondingly provided with a sealing ring (32).

12. The electronic expansion valve according to claim 8, characterized in that: Along the radial direction of the sealing gasket (31), the size of the inner end (3102) of the sealing gasket (31) in the axial direction is smaller than the size of the outer end (3013) of the sealing gasket (31) in the axial direction.

13. The electronic expansion valve according to claim 5, characterized in that: The first anti-rotation structure (201) includes a first anti-rotation plane, which is parallel to the axis of the piston component (20); the second anti-rotation structure (301) includes a second anti-rotation plane, which is parallel to the axis of the piston component (20); along the circumference of the piston component (20), the distance between the end point of the first anti-rotation plane and the axis of the piston component (20) is greater than the minimum distance between the second anti-rotation plane and the axis of the piston component (20).

14. The electronic expansion valve according to claim 13, characterized in that: A first guide structure (202) is provided on the outer wall of the piston component (20), and the first guide structure (202) extends along the axial direction of the piston component (20), and the first guide structure (202) and the first anti-rotation structure (201) are distributed along the circumference of the piston component (20); a second guide structure (302) is provided on the inner wall of the sealing part (30), and the second guide structure (302) and the second anti-rotation structure (301) are distributed along the circumference of the sealing part (30), and the second guide structure (302) and the first guide structure (202) are guided and matched.

15. The electronic expansion valve according to claim 5, characterized in that: A balancing channel is provided on the piston component (20). When the piston component (20) blocks the valve port (103), one end of the balancing channel is communicated with the second interface (104), and the other end of the balancing channel is communicated with the second chamber (1022).

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