Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve, including a nut, a screw and a stop assembly, the stop assembly including a limit spring and a screw passing through the nut, the screw including a guide rod section and a threaded rod section connected to each other, the threaded rod section is located inside the nut and threadedly connected to the nut, the guide rod section is located outside the nut, the limit spring is connected to the nut, and part of the limit spring is spirally wound around the outer circumference of the guide rod section. The technical solution provided by the utility model can solve the problem in the prior art that the nut needs to be made longer as a whole due to the need to process a spiral guide groove for limiting the installation of the stopper, which is not conducive to the miniaturization and lightweight of the electronic expansion valve.

Description

Technical Field

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

[0002] In the prior art, the limit spring in the stop device is often sleeved on the outer periphery of the nut member, but such a setting requires the nut member to be processed longer, which has high processing costs and is not conducive to the miniaturization and lightness of the electronic expansion valve. Utility Model Content

[0003] The utility model provides an electronic expansion valve to solve the problem in the prior art that a nut needs to be processed to be long, which is not conducive to miniaturization and lightness of the electronic expansion valve.

[0004] In order to solve the above problems, the utility model provides an electronic expansion valve, including a nut member, a screw and a stop assembly, the stop assembly includes a limit spring, the screw rod includes a guide rod segment and a threaded rod segment connected to each other, the threaded rod segment is located inside the nut member and threadedly connected to the nut member, the guide rod segment is located outside the nut member, the limit spring is connected to the nut member, and part of the limit spring is spirally wound around the outer circumference of the guide rod segment.

[0005] Furthermore, the limit spring includes a winding section and a transition section, the nut member has a limit groove, the transition section is connected to the winding section toward the side of the nut member and extends into the limit groove, and the transition section is limitedly matched with the inner wall of the limit groove to limit the rotation of the limit spring in the circumferential direction of the screw.

[0006] Furthermore, the bottom wall of the limiting groove is parallel to the axial direction of the nut member, or the bottom wall of the limiting groove is inclined.

[0007] Furthermore, the bottom wall of the limit groove has a limit hole extending radially along the nut member, the transition section includes a limit section and a bending section connected to each other, there is an angle between the limit section and the bending section, the limit section is arranged in the limit groove, and the bending section is arranged in the limit hole to limit the movement of the limit spring in the axial direction of the screw.

[0008] Furthermore, a boss structure is provided on the outer periphery of the nut member, and the limiting groove is provided on the boss structure.

[0009] Furthermore, the stop assembly also includes a stopper, which is sleeved on the outer periphery of the guide rod segment and nested in the limit spring, and the stopper slides with the limit spring; the limit spring has a first limit portion and a second limit portion, and the electronic expansion valve also includes a rotor assembly and a guide plate, and the rotor assembly drives the stopper to rotate up and down through the guide plate, and the stopper respectively stops and cooperates with the first limit portion and the second limit portion.

[0010] Furthermore, two ends of the stopper are respectively provided with a first extension section extending along the radial direction of the electronic expansion valve and a second extension section extending along the radial direction of the electronic expansion valve. The limit spring comprises a winding section spirally wound on the outer periphery of the guide rod section and a transition section externally connected to the nut member. The winding section is spirally wound on the outer periphery of the guide rod section and is spaced apart from the nut member in the axial direction of the screw rod. The stopper is nested in the winding section. The first limiting portion is arranged at one end of the winding section away from the transition section and extends along the axial direction of the electronic expansion valve. The second limiting portion is the transition section. The second extension section is stop-matched with the first limiting portion, and the first extension section is stop-matched with the second limiting portion.

[0011] Furthermore, the rotor assembly and the guide plate are integrally arranged, and the guide plate abuts against the second extending section to drive the stopper to rotate.

[0012] Furthermore, the electronic expansion valve further comprises a valve core and a connecting sleeve, and at least a portion of the nut member is pressed tightly in the connecting sleeve by the valve core.

[0013] Furthermore, the connecting sleeve has a mounting hole, and the nut member includes an assembly section and a mating section that are connected to each other, at least a portion of the mating section is located in the mounting hole and connected to the connecting sleeve, the assembly section extends out of the mounting hole, and the nut member has a limiting groove for connecting a limiting spring, the limiting groove is arranged on the outer periphery of the assembly section, and the maximum dimension of the assembly section in the radial direction of the nut member is smaller than the minimum aperture of the mounting hole.

[0014] By applying the technical solution of the utility model, an electronic expansion valve is provided, comprising a nut member, a screw rod and a stop assembly, the stop assembly comprising a limit spring, the screw rod comprising a guide rod segment and a threaded rod segment which are connected to each other, the threaded rod segment being located inside the nut and threadedly connected to the nut member, the guide rod segment being located outside the nut member, the limit spring being connected to the nut member, and part of the limit spring being spirally wound around the outer circumference of the guide rod segment.

[0015] With this solution, the guide rod section of the screw is located outside the nut member, and a limit spring is sleeved on the outer periphery of the guide rod section of the screw to form a spiral guide groove. Compared with the prior art where a limit spring needs to be sleeved on the nut member to form a spiral guide groove, the overall length of the nut member is reduced, so that the nut member does not need to be processed longer, thereby reducing the processing cost of the nut member. In addition, the radial dimension of the spiral guide groove at the guide rod section is reduced, and the overall width of the rotor assembly is reduced, which is conducive to the lightweight and miniaturization of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1A cross-sectional view of an electronic expansion valve provided in an embodiment of the utility model is shown;

[0018] Figure 2 Shows Figure 1 A structural schematic diagram of a nut member of an electronic expansion valve;

[0019] Figure 3 Shows Figure 1 A cross-sectional view of a nut member of an electronic expansion valve;

[0020] Figure 4 Shows Figure 1 A cross-sectional view of a connection sleeve of an electronic expansion valve;

[0021] Figure 5 Shows Figure 1 A schematic diagram of the structure of a driving assembly of an electronic expansion valve;

[0022] Figure 6 Shows Figure 1 A schematic structural diagram of a stopper of an electronic expansion valve.

[0023] The above drawings include the following reference numerals:

[0024] 10. valve body assembly; 101. upper sub-chamber; 102. lower sub-chamber;

[0025] 11. Connecting sleeve; 111. Mounting hole;

[0026] 12. nut member; 121. limiting groove; 122. limiting hole; 123. assembly section; 124. matching section; 125. balancing hole; 126. boss structure;

[0027] 13. Valve core;

[0028] 14. Valve body;

[0029] 20. Stop assembly; 21. Limit spring; 211. Winding section; 212. Transfer section; 2121. Limit section; 2122. Bending section; 22. Screw; 221. Guide rod section; 222. Threaded rod section;

[0030] 30. driving assembly; 31. rotor assembly; 32. guide plate;

[0031] 40. Stopper; 41. First extension section; 42. Sleeve section; 43. Second extension section. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] like Figures 1 to 6 As shown, an embodiment of the utility model provides an electronic expansion valve, including a nut member 12, a screw rod 22 and a stop assembly 20, the stop assembly 20 includes a limit spring 21, the screw rod 22 includes a guide rod segment 221 and a threaded rod segment 222 that are interconnected, the threaded rod segment 222 is located inside the nut member 12 and is threadedly connected to the nut member 12, the guide rod segment 221 is located outside the nut member 12, the limit spring 21 is connected to the nut member 12, and part of the limit spring 21 is spirally wound around the outer periphery of the guide rod segment 221.

[0034] In this embodiment, the guide rod section 221 of the screw 22 is located outside the nut member 12, and a limit spring 21 is sleeved on the outer periphery of the guide rod section 221 of the screw 22 to form a spiral guide groove. Compared with the prior art, in which a limit spring 21 is sleeved on the nut member 12 sleeved on the outer periphery of the screw guide rod section 221 to form a spiral guide groove, the overall length of the nut member 12 is reduced, so that the nut member 12 does not need to be processed longer, thereby reducing the processing cost of the nut member 12. In addition, the radial dimension of the spiral guide groove at the guide rod section is reduced, and the overall width of the rotor assembly is reduced, which is conducive to the lightweight and miniaturization of the electronic expansion valve.

[0035] like Figures 1 to 3 As shown, the limit spring 21 includes a winding section 211 and a transition section 212, the nut member 12 has a limit groove 121, the transition section 212 is connected to the winding section 211 on one side of the nut member 12 and extends into the limit groove 121, and the transition section 212 is limitedly matched with the inner wall of the limit groove 121 to limit the rotation of the limit spring 21 in the circumferential direction of the screw rod 22.

[0036] In this arrangement, a spiral guide groove is formed by the cooperation between the winding section 211 and the guide rod section 221 , and the rotation limitation of the limit spring 21 is achieved by the cooperation between the transition section 212 and the limit groove 121 , thereby ensuring the stability and reliability of the installation of the limit spring 21 .

[0037] Specifically, the bottom wall of the limiting groove 121 is parallel to the axial direction of the nut member 12 , or the bottom wall of the limiting groove 121 is inclined.

[0038] It is understandable that the extension direction of part of the transition section 212 is parallel to the inner wall of the limiting groove 121 on the side close to the axis of the nut member 12. This arrangement is conducive to adjusting the bending and tilting of the transition section 212 on the basis of ensuring the structural strength of the transition section 212. It should be noted that the bottom wall of the limiting groove 121 is the inner wall of the side of the limiting groove 121 close to the axis of the nut member 12. Preferably, the bottom wall of the limiting groove 121 in this embodiment is inclined, which is conducive to ensuring the structural strength of the transition section 212 while ensuring the limiting effect.

[0039] Preferably, the center line of the limiting groove 121 in this embodiment is located on a plane where the axis of the nut member 12 is located, that is, the limiting groove 121 extends obliquely along the axial direction of the nut member 12. It is understandable that in other embodiments not shown in the figure, the limiting groove 121 can also be arranged along the outer periphery of the nut member 12 in a spiral manner.

[0040] Furthermore, the bottom wall of the limiting groove 121 has a limiting hole 122, and the transition section 212 includes a limiting section 2121 and a bending section 2122 that are interconnected. There is an angle between the limiting section 2121 and the bending section 2122. The limiting section 2121 is arranged in the limiting groove 121, and the bending section 2122 is arranged in the limiting hole 122 to limit the axial movement of the limiting spring 21 in the screw rod 22.

[0041] In this way, the movement of the limit spring 21 along the axial direction of the nut member 12 is limited by the cooperation between the bending section 2122 and the limit hole 122, further ensuring the stability and reliability of the installation of the limit spring 21.

[0042] Preferably, in other embodiments not shown in the figures, on the basis of ensuring the movement limitation of the limit spring 21 along the axial direction of the nut member 12, the bending section 2122 can also extend obliquely along the radial direction of the nut member 12, which will not be exemplified here.

[0043] The limiting hole 122 in this embodiment is located at the bottom of the inner wall of the limiting groove 121 close to the axis of the nut member 12, which is conducive to ensuring the limiting area and limiting effect of the limiting groove 121 on the limiting section 2121, and is convenient for the processing of the limiting hole 122 and the installation of the bending section 2122. Preferably, the limiting hole 122 in this embodiment is a blind hole, and the limiting hole 122 extends radially along the nut member 12.

[0044] By configuring in this way, the dimensions of the assembly section 123 and the mounting hole 111 are limited, thereby ensuring that the nut member 12 can be smoothly installed.

[0045] Specifically, a boss structure 126 is provided on the periphery of the nut member 12, and the limiting groove 121 is provided on the boss structure 126. In this embodiment, the boss structure 126 is provided on the periphery of the assembly section 123. The boss structure 126 may be a rectangular block or other structure, and the shape and size of the boss structure 126 may be adaptively adjusted according to actual conditions.

[0046] In this way, the boss structure 126 increases the thickness of the side wall of the assembly section 123 used for processing the limiting groove 121, thereby avoiding the situation where the limiting groove 121 is directly processed on the side wall of the assembly section 123, which may easily affect the structural strength of the assembly section 123.

[0047] like Figure 1 As shown, the stop assembly 20 also includes a stopper 40, which is sleeved on the outer periphery of the guide rod segment 221 and nested in the limit spring 21, and the stopper 40 is slidably matched with the limit spring 21; the limit spring 21 has a first limit portion and a second limit portion, and the electronic expansion valve also includes a drive assembly 30, the drive assembly 30 includes a rotor assembly 31 and a guide plate 32, the rotor assembly 31 drives the stopper 40 to rotate up and down through the guide plate 32, and the stopper 40 is respectively matched with the first limit portion and the second limit portion for stopping.

[0048] In this embodiment, the screw 22 is driven to rotate by the rotor assembly 31 and the guide plate 32, thereby realizing the switch valve adjustment of the electronic expansion valve. The driving adjustment of the screw 22 is limited by the stop member 40 and the first limit part and the second limit part, thereby ensuring the reliability of the electronic expansion valve.

[0049] It is understandable that the valve body assembly 10 further includes a valve body 14 connected to the connecting sleeve 11 , and one end of the guide rod segment 221 protruding from the nut member 12 extends into the valve body 14 and is connected to the rotor assembly 31 of the drive assembly 30 .

[0050] Specifically, the two ends of the stopper 40 are respectively provided with a first extension section 41 extending along the radial direction of the electronic expansion valve and a second extension section 43 extending along the radial direction of the electronic expansion valve. The limit spring 21 includes a winding section 211 spirally wound on the outer periphery of the guide rod section 221 and a transition section 212 connected to the outside of the nut member 12. The winding section 211 is spirally wound on the outer periphery of the guide rod section 221 and is spaced from the nut member 12 in the axial direction of the screw rod 22. The stopper 40 is nested in the winding section 211; the first limiting portion is arranged at one end of the winding section 211 away from the transition section 212 and extends along the axial direction of the electronic expansion valve, and the second limiting portion is the transition section 212; the second extension section 43 is engaged with the first limiting portion, and the first extension section 41 is engaged with the second limiting portion.

[0051] In this embodiment, the spiral gap of the winding section 211 around the guide rod section 221 forms a spiral guide groove, the portion between the first extension section 41 and the second extension section 43 forms a sleeve section 42, and the sleeve section 42 of the stopper 40 is nested in the spiral gap guide groove. The second extension section 43 and the guide plate 32 are detachably abutted in the circumferential direction of the nut member 12 and are engaged with the first limiting portion, and the first extension section 41 and the transition section 212 (second limiting portion) are engaged in the circumferential direction of the nut member 12.

[0052] In this embodiment, the rotor assembly 31 and the guide piece 32 are integrally arranged, and the guide piece 32 abuts against the second extension section 43 to drive the stopper 40 to rotate. This arrangement avoids the problem of high processing cost and low efficiency caused by high processing accuracy and assembly accuracy of the guide piece 32 and the rotor assembly in the prior art, which is conducive to reducing the processing cost of the drive assembly 30 and improving the processing efficiency of the drive assembly 30, and is also conducive to improving the reliability of the drive assembly 30.

[0053] like Figures 1 to 4 As shown, the electronic expansion valve also includes a valve core 13 and a connecting sleeve 11, the connecting sleeve 11 has a mounting hole 111, the nut member 12 includes an assembly section 123 and a matching section 124 that are connected to each other, at least part of the matching section 124 is located in the mounting hole 111 and is connected to the connecting sleeve 11, the assembly section 123 extends out of the mounting hole 111, the limiting groove 121 is arranged on the outer periphery of the assembly section 123, and the maximum dimension of the assembly section 123 in the radial direction of the nut member 12 is smaller than the minimum aperture of the mounting hole 111.

[0054] In this embodiment, at least part of the nut member 12 is pressed by the valve core 13 in the connecting sleeve 11 to realize the connection between the nut member 12, the valve core 13 and the connecting sleeve 11. The nut member 12 is partially arranged in the mounting hole 111 of the connecting sleeve 11 and is limitedly matched with the inner wall of the mounting hole 111. The valve core 13 is interference-fitted with the inner wall of the mounting hole 111 of the connecting sleeve 11, or the valve core 13 is limitedly matched with the inner wall of the mounting hole 111. After the valve core 13 presses the nut member 12, it is welded to the connecting sleeve 11.

[0055] It should be noted that, as in this embodiment Figure 3 and Figure 4As shown, the matching section 124 includes a first subsection and a second subsection connected to each other, the outer diameter of the first subsection is smaller than that of the second subsection and a stop limit surface is formed between the two, the mounting hole 111 includes a first hole section, a second hole section and a third hole section which are connected in sequence and have increasing apertures in sequence, an upper limit step surface is formed between the first hole section and the second hole section, and a lower limit step surface is formed between the second hole section and the third hole section. The first subsection is arranged in the first hole section and is limitedly matched with the inner wall of the first hole section, and the second subsection is arranged in the second hole section and is limitedly matched with the inner wall of the second hole section; the valve core 13 is at least partially arranged in the third hole section and is limitedly matched with the inner wall of the third hole section, the stop limit surface is stop-matched with the upper limit step surface, and the end of the valve core 13 extending into the third hole section is stop-matched with the lower limit step surface, so as to realize the compression of the nut member 12 in the connecting sleeve 11 through the valve core 13.

[0056] Preferably, a rotation limiting structure is provided between the matching section 124 and the mounting hole 111 to limit the rotation of the nut member 12 in the connecting sleeve 11 .

[0057] The second subsection of the matching section 124 extends to a height H along the axial direction of the nut member 12 , and the second hole section of the mounting hole 111 that matches the outer periphery of the second subsection extends to a height L along the axial direction of the nut member 12 , H≥L.

[0058] Preferably, the gap difference between H and L should ensure that it will not affect the press-fit abutment of the valve core 13 against the nut member 12 , thereby ensuring the reliability and stability of the limited installation of the nut member 12 .

[0059] It is understandable that in other embodiments not shown in the figures, the nut member 12 can also be directly welded to the connecting sleeve 11, and the valve core 13 and the connecting sleeve 11 are interference fit or the valve core 13 presses the nut member 12 and then welded to the connecting sleeve 11.

[0060] In this way, by designing a nut part 12 that does not need to be transferred through a connecting plate, the nut part 12 is fixed by using an interference fit, etc., which facilitates the limited installation of the nut part 12 by the valve core 13 and the connecting sleeve 11, eliminates the injection molding and welding steps of the nut part 12 in the prior art, and is beneficial to improving installation efficiency.

[0061] like Figures 1 to 3 As shown, the nut member 12 divides the cavity of the valve body assembly 10 into an upper sub-cavity 101 and a lower sub-cavity 102. The nut member 12 has a balancing hole 125. The balancing hole 125 connects the internal area of ​​the nut member 12 and the gap area between the outer periphery of the nut member 12 and the inner hole of the connecting sleeve 11 to connect the upper sub-cavity 101 and the lower sub-cavity 102.

[0062] In this way, the upper sub-chamber 101 and the lower sub-chamber 102 are connected through the balance hole 125 to ensure the pressure balance in the upper sub-chamber 101 and the lower sub-chamber 102 when the valve is switched, thereby ensuring the reliability and stability of the switching movement of the electronic expansion valve.

[0063] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. 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 the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a 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 exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0065] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.

[0067] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0068] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electronic expansion valve, characterized in that: include: A nut member (12) and a screw rod (22); A stop assembly (20) comprises a limit spring (21); the screw rod (22) comprises a guide rod segment (221) and a threaded rod segment (222) which are connected to each other; the threaded rod segment (222) is located inside the nut member (12) and is threadedly connected to the nut member (12); the guide rod segment (221) is located outside the nut member (12); the limit spring (21) is connected to the nut member (12); and a portion of the limit spring (21) is spirally wound around the outer periphery of the guide rod segment (221).

2. The electronic expansion valve according to claim 1, characterized in that: The limit spring (21) comprises a winding section (211) and a transition section (212); the nut member (12) has a limit groove (121); the transition section (212) is connected to the winding section (211) on one side of the nut member (12) and extends into the limit groove (121); the transition section (212) is limitedly matched with the inner wall of the limit groove (121) to limit the rotation of the limit spring (21) in the circumferential direction of the screw rod (22).

3. The electronic expansion valve according to claim 2, characterized in that: The bottom wall of the limiting groove (121) is parallel to the axial direction of the nut member (12), or the bottom wall of the limiting groove (121) is inclined.

4. The electronic expansion valve according to claim 2, characterized in that: The bottom wall of the limiting groove (121) is provided with a limiting hole (122); the transition section (212) comprises a limiting section (2121) and a bending section (2122) which are connected to each other; an angle is formed between the limiting section (2121) and the bending section (2122); the limiting section (2121) is arranged in the limiting groove (121), and the bending section (2122) is arranged in the limiting hole (122), so as to limit the axial movement of the limiting spring (21) on the screw rod (22).

5. The electronic expansion valve according to claim 2, characterized in that: A boss structure (126) is provided on the outer periphery of the nut member (12), and the limiting groove (121) is arranged on the boss structure (126).

6. The electronic expansion valve according to claim 1, characterized in that: The stopper assembly (20) further comprises a stopper (40), the stopper (40) being sleeved on the outer periphery of the guide rod segment (221) and being nested in the limit spring (21), the stopper (40) being in sliding cooperation with the limit spring (21); the limit spring (21) having a first limit portion and a second limit portion, the electronic expansion valve further comprises a rotor assembly (31) and a guide plate (32), the rotor assembly (31) driving the stopper (40) to rotate up and down through the guide plate (32), the stopper (40) being in stop cooperation with the first limit portion and the second limit portion respectively.

7. The electronic expansion valve according to claim 6, characterized in that: The two ends of the stopper (40) are respectively provided with a first extension section (41) extending in the radial direction of the electronic expansion valve and a second extension section (43) extending in the radial direction of the electronic expansion valve. The limit spring (21) comprises a winding section (211) spirally wound around the outer periphery of the guide rod section (221) and a transition section (212) externally connected to the nut member (12). The winding section (211) is spirally wound around the outer periphery of the guide rod section (221) and is spaced apart from the nut member (12) in the axial direction of the screw rod (22). The stopper (40) is nested in the winding section (211). The first limiting portion is arranged at one end of the winding section (211) away from the transition section (212) and extends in the axial direction of the electronic expansion valve. The second limiting portion is the transition section (212). The second extension section (43) is stop-matched with the first limiting portion, and the first extension section (41) is stop-matched with the second limiting portion.

8. The electronic expansion valve according to claim 7, characterized in that: The rotor assembly (31) and the guide piece (32) are integrally arranged, and the guide piece (32) abuts against the second extending section (43) to drive the stopper (40) to rotate.

9. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a valve core (13) and a connecting sleeve (11), and at least a portion of the nut member (12) is pressed tightly by the valve core (13) into the connecting sleeve (11).

10. The electronic expansion valve according to claim 9, characterized in that: The connecting sleeve (11) has a mounting hole (111); the nut member (12) comprises an assembly section (123) and a matching section (124) which are connected to each other; at least a portion of the matching section (124) is located in the mounting hole (111) and connected to the connecting sleeve (11); the assembly section (123) extends out of the mounting hole (111); the nut member (12) has a limiting groove (121) for connecting the limiting spring (21); the limiting groove (121) is arranged on the outer periphery of the assembly section (123); and the maximum dimension of the assembly section (123) in the radial direction of the nut member (12) is smaller than the minimum aperture of the mounting hole (111).

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