CN112576769B

CN112576769B - Electronic expansion valve

Info

Publication number: CN112576769B
Application number: CN201910927066.8A
Authority: CN
Inventors: 詹少军; 邸志强; 程明扬
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2022-02-11
Anticipated expiration: 2039-09-27
Also published as: CN112576769A

Abstract

The invention provides an electronic expansion valve, comprising: a housing; the guide sleeve is arranged in the shell; a rotor rotatably disposed within the housing; the screw is arranged in the shell, and the rotor is in driving connection with the screw; the valve needle assembly is movably arranged in the shell, and one end of the screw is connected with the valve needle assembly so as to drive the valve needle assembly to move axially through the screw; the inner wall of the shell and the outer wall of the guide sleeve are provided with a guide section and a press fitting section which are communicated with each other, the distance between the guide sleeve positioned at the guide section and the shell is larger than the distance between the guide sleeve positioned at the press fitting section and the shell, a welding ring groove is further arranged between the inner wall of the shell and the outer wall of the guide sleeve, and the welding ring groove is communicated with the guide section. Through the technical scheme provided by the application, the problem of low coaxiality in the prior art can be solved.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve.

Background

Currently, an electronic expansion valve includes a housing and a guide sleeve, and the guide sleeve is disposed in the housing. The electronic expansion valve is respectively connected with the first pipe fitting and the second pipe fitting, and the communication condition of the first pipe fitting and the second pipe fitting can be controlled by the electronic expansion valve.

When the electronic expansion valve is assembled with the first pipe fitting and the second pipe fitting, the first pipe fitting and the second pipe fitting are welded to the shell in a furnace welding mode, and then the guide sleeve is pressed into the shell.

However, in the prior art, after the first pipe fitting and the second pipe fitting are welded to the shell, when the guide sleeve is pressed into the shell, the first pipe fitting and the second pipe fitting can affect the press fitting of the guide sleeve, and the guide sleeve and the valve seat are easily subjected to the unilateral tilting condition during laser welding, so that the coaxiality of the guide sleeve and the shell is difficult to ensure. Therefore, the prior art has the problem of low coaxiality.

Disclosure of Invention

The invention provides an electronic expansion valve, which aims to solve the problem of low coaxiality in the prior art.

The invention provides an electronic expansion valve, which comprises: a housing; the guide sleeve is arranged in the shell; a rotor rotatably disposed within the housing; the screw is arranged in the shell, and the rotor is in driving connection with the screw; the valve needle assembly is movably arranged in the shell, and one end of the screw is connected with the valve needle assembly so as to drive the valve needle assembly to move axially through the screw; the inner wall of the shell and the outer wall of the guide sleeve are provided with a guide section and a press fitting section which are communicated with each other, the distance between the guide sleeve positioned at the guide section and the shell is larger than the distance between the guide sleeve positioned at the press fitting section and the shell, a welding ring groove is further arranged between the inner wall of the shell and the outer wall of the guide sleeve, and the welding ring groove is communicated with the guide section.

Furthermore, the shell comprises a sleeve and a valve seat, the guide sleeve is arranged in the valve seat, and the guide section and the press-fitting section are located between the guide sleeve and the valve seat.

Furthermore, the valve seat is provided with a mounting hole, the guide sleeve is arranged in the mounting hole, the mounting hole is provided with a first section and a second section which are connected with each other, the inner wall of the first section is matched with the guide sleeve to form the guide section, and the inner wall of the second section is matched with the guide sleeve to form the press-fitting section.

Further, the aperture of the first section is larger than the aperture of the second section.

Furthermore, an installation boss is arranged on the guide sleeve and circumferentially arranged along the side wall of the guide sleeve, and a guide section and a press-fitting section are formed between the side wall of the installation boss and the inner wall of the installation hole.

Furthermore, the mounting boss comprises a third section and a fourth section, the third section is arranged corresponding to the first section, and the fourth section is arranged corresponding to the second section.

Further, the cross-sectional dimension of the third segment is equal to the cross-sectional dimension of the fourth segment.

Further, the cross-sectional dimension of the third section is smaller or larger than the cross-sectional dimension of the fourth section.

Furthermore, the installation boss is provided with a welding ring groove, the welding ring groove is positioned between the third section and the fourth section, and the welding ring groove is circumferentially arranged along the side wall of the installation boss.

Furthermore, a limiting boss is arranged in the mounting hole, the limiting boss is located on one side, far away from the first section, of the second section, and the limiting boss is matched with the mounting boss to limit displacement of the guide sleeve relative to the valve seat.

Further, the electronic expansion valve further comprises a nut assembly, a nut guide section is arranged on the guide sleeve, and the nut assembly is sleeved on the nut guide section.

By applying the technical scheme of the invention, the electronic expansion valve comprises a shell, a guide sleeve, a rotor, a screw and a valve needle assembly. Wherein, the guide sleeve is arranged in the shell. The inner wall of the shell and the outer wall of the guide sleeve are provided with a guide section and a press fitting section which are communicated with each other, and the distance between the guide sleeve positioned at the guide section and the shell is larger than the distance between the guide sleeve positioned at the press fitting section and the shell. Because there is the clearance between the uide bushing that is located the direction section and the casing, still be provided with between the outer wall of the inner wall of casing and uide bushing and weld the annular, and weld annular and the direction section intercommunication, satisfy the welding process requirement of furnace welding, can weld uide bushing, first pipe fitting and second pipe fitting to the casing through the mode of integrative furnace welding through the mode of furnace welding. By adopting the structure, the guide sleeve is welded on the shell in an integrated furnace welding mode, and the first pipe fitting and the second pipe fitting cannot influence the press fitting of the guide sleeve, so that the coaxiality of the guide sleeve and the shell can be ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of an electronic expansion valve provided according to an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the valve seat after press-fitting with the guide sleeve;

FIG. 3 is a schematic view of the guide section guiding the guide sleeve as the guide sleeve is placed into the valve seat;

FIG. 4 shows a partial enlarged view at A in FIG. 3;

FIG. 5 shows a schematic view after press fitting of the guide sleeve to the press fitting section;

FIG. 6 shows a partial enlarged view at B in FIG. 5;

FIG. 7 shows a schematic structural view of the guide sleeve of FIG. 1;

fig. 8 shows a schematic view of the valve seat of fig. 1.

Wherein the figures include the following reference numerals:

10. a housing; 11. a sleeve; 12. a valve seat; 121. mounting holes; 121a, a first segment; 121b, a second segment; 121c, a limiting boss;

20. a guide sleeve; 21. mounting a boss; 211. a third stage; 212. a fourth stage; 213. welding a ring groove; 22. a nut guide section;

30. a nut assembly; 40. a rotor; 50. a screw; 60. a valve needle assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 8, an embodiment of the present invention provides an electronic expansion valve, which includes a housing 10, a guide sleeve 20, a rotor 40, a screw 50, and a valve needle assembly 60. Wherein the guide sleeve 20 and the screw 50 are both disposed within the housing 10. Specifically, rotor 40 is rotatably disposed within housing 10, and rotor 40 is drivingly connected to screw 50. The valve needle assembly 60 is movably disposed in the housing 10, and by connecting one end of the screw 50 with the valve needle assembly 60, the screw 50 can drive the valve needle assembly 60 to move axially, so that the valve needle assembly 60 can be used to open or close the valve port. Wherein, a guiding section and a press-fitting section which are communicated with each other are arranged between the inner wall of the shell 10 and the outer wall of the guiding sleeve 20, the distance between the guiding sleeve 20 and the shell 10 which are positioned at the guiding section is larger than the distance between the guiding sleeve 20 and the shell 10 which are positioned at the press-fitting section, a welding ring groove 213 is also arranged between the inner wall of the shell 10 and the outer wall of the guiding sleeve 20, and the welding ring groove 213 is communicated with the guiding section. The welding ring groove 213 may be entirely disposed in the guide section, or the welding ring groove 213 may be partially disposed in the guide section and partially disposed in the press-fitting section. In this embodiment, the welding ring groove 213 is partially disposed in the guiding section and partially disposed in the press-fitting section, so that the gap can be fully filled with the solder, and the welding effect can be improved.

The distance between the guide sleeve 20 positioned in the guide section and the shell 10 is greater than the distance between the guide sleeve 20 positioned in the press-fitting section and the shell 10, and the press-fitting device comprises the following three structures:

in the first structure, a guide section may be formed between the inner wall of the housing 10 and the outer wall of the guide sleeve 20 by enlarging the inner diameter of a portion of the inner wall of the housing 10, and a press-fitting section may be formed between the inner wall of the housing 10 and the outer wall of the guide sleeve 20 by interference-fitting another portion of the inner wall of the housing 10 with the outer wall of the guide sleeve 20;

in the second structure, a guide section can be formed between the outer wall of the guide sleeve 20 and the inner wall of the housing 10 by reducing the outer diameter of a part of the outer wall of the guide sleeve 20, and a press-fitting section can be formed between the outer wall of the guide sleeve 20 and the inner wall of the housing 10 by interference-fitting another part of the outer wall of the guide sleeve 20 and the inner wall of the housing 10;

in the third structure, the inner diameter of a portion of the inner wall of the housing 10 is enlarged and the outer diameter of a portion of the outer wall of the guide sleeve 20 is reduced, so that a guide section is formed between the inner wall of the housing 10 and the outer wall of the guide sleeve 20, and a press-fitting section is formed between the inner wall of the housing 10 and the outer wall of the guide sleeve 20 by interference-fitting another portion of the inner wall of the housing 10 and another portion of the outer wall of the guide sleeve 20.

In the present embodiment, the first structure is adopted such that the distance between the guide bush 20 located at the guide section and the housing 10 is larger than the distance between the guide bush 20 located at the press-fitting section and the housing 10.

By applying the electronic expansion valve provided by the embodiment, when the device is assembled, the guide sleeve 20 and the shell 10 can be assembled firstly, and when the guide sleeve 20 is pressed on the shell 10, the guide section can position and guide the guide sleeve 20 so as to install the guide sleeve 20 into the shell 10, and the press-fitting section can realize the press-fitting of the guide sleeve and the shell. After the press fitting is completed, the first pipe fitting and the second pipe fitting are connected with the shell 10 respectively, and due to the fact that a gap exists between the guide sleeve 20 located at the guide section and the shell 10, a welding ring groove 213 is arranged between the inner wall of the shell 10 and the outer wall of the guide sleeve 20, the welding ring groove 213 is communicated with the guide section, the welding process requirement of furnace welding is met, and the guide sleeve 20, the first pipe fitting and the second pipe fitting can be welded to the shell 10 in an integrated furnace welding mode. By adopting the structure, the guide sleeve 20 is welded on the shell 10 in a furnace welding mode, and the first pipe fitting and the second pipe fitting cannot influence the press fitting of the guide sleeve 20, so that the coaxiality of the guide sleeve 20 and the shell 10 can be ensured.

In addition, since the laser welding process is complex and the cost is high, the first pipe fitting, the second pipe fitting and the guide sleeve 20 are welded to the shell 10 in an integrated furnace welding mode, the processing process can be simplified, and the processing cost can be reduced. Specifically, when the guide sleeve 20 is welded to the housing 10 by laser welding in the prior art, the welding process itself cannot ensure the coaxiality between the guide sleeve 20 and the housing 10 because there are a plurality of welding points between the guide sleeve 20 and the housing 10. In this embodiment, the guide sleeve 20 is welded to the housing 10 by furnace welding, and the welding process does not affect the coaxiality of the guide sleeve 20 and the housing 10, so that the precision of the device can be improved, and the sealing performance of the electronic expansion valve can be improved.

Specifically, the housing 10 includes a sleeve 11 and a valve seat 12, the guide sleeve 20 is disposed in the valve seat 12, and the guide section and the press-fitting section are located between the guide sleeve 20 and the valve seat 12. Wherein the first and second pipe elements are both connected to the valve seat 12.

Wherein the valve seat 12 has a mounting hole 121, the guide sleeve 20 is disposed in the mounting hole 121, and the mounting hole 121 has a first segment 121a and a second segment 121b connected to each other. In this embodiment, the inner wall of the first segment 121a cooperates with the guide sleeve 20 to form a guide segment, the inner wall of the second segment 121b cooperates with the guide sleeve 20 to form a press-fitting segment, and the first segment 121a is located above the second segment 121 b. In other embodiments, the first segment 121a may be located below the second segment 121 b.

In this embodiment, the first section 121a has a larger diameter than the second section 121b, so that the distance between the guide sleeve 20 of the guide section and the housing 10 is larger than the distance between the guide sleeve 20 of the press-fitting section and the housing 10. Specifically, the first section 121a has an aperture 0.02mm to 0.08mm larger than that of the second section 121 b. By adopting the structure, the distance between the guide sleeve 20 and the first section 121a is 0.01mm to 0.04mm, and the guide sleeve 20 and the second section 121b are in interference fit.

Wherein, be provided with installation boss 21 on the uide bushing 20, installation boss 21 sets up along the lateral wall circumference of uide bushing 20, forms guide section and pressure equipment section between the lateral wall of installation boss 21 and the inner wall of mounting hole 121. Specifically, a guide section and a press-fitting section are formed between the side wall of the mounting boss 21 and the inner walls of the first section 121a and the second section 121b of the mounting hole 121.

Specifically, the mounting boss 21 includes a third section 211 and a fourth section 212, the third section 211 is disposed corresponding to the first section 121a, and the fourth section 212 is disposed corresponding to the second section 121 b. Wherein the third segment 211 is located above the fourth segment 212.

In the present embodiment, the cross-sectional dimension of the third section 211 is equal to the cross-sectional dimension of the fourth section 212.

In this embodiment, the mounting boss 21 is provided with a welding ring groove 213, the welding ring groove 213 is located between the third section 211 and the fourth section 212, and the welding ring groove 213 is circumferentially arranged along the sidewall of the mounting boss 21. Specifically, one end of the welding ring groove 213 is connected to the third section 211, and the other end of the welding ring groove 213 is connected to the fourth section 212. With the above structure, the welding ring groove 213 can be used to place the welding ring, so that the connection between the guide sleeve 20 and the housing 10 can be completed by furnace welding.

Wherein, be provided with spacing boss 121c in the mounting hole 121, spacing boss 121c is located the one side of keeping away from first section 121a of second section 121 b. Specifically, one end of the limiting boss 121c is connected to the second segment 121 b. By engaging the position-limiting projection 121c with the mounting projection 21, the displacement of the guide sleeve 20 relative to the valve seat 12 can be limited to prevent the guide sleeve 20 from penetrating excessively into the mounting hole 121.

In this embodiment, the electronic expansion valve further includes a nut assembly 30, the guiding sleeve 20 is provided with a nut guiding section 22, and the nut assembly 30 is sleeved on the nut guiding section 22. Specifically, the nut guide section 22 is connected to the mounting boss 21 and located above the mounting boss 21. After the welding of the guiding sleeve 20 and the shell 10 is completed, the nut assembly 30 can be press-fitted onto the nut guiding section 22 of the guiding sleeve 20, and during the press-fitting process, the nut guiding section 22 can perform positioning and guiding functions on the nut assembly 30.

The assembly steps of the device provided by the first embodiment are as follows:

(1) the guide sleeve 20 is placed in the valve seat 12, and the fourth section 212 of the guide sleeve 20 is in clearance fit with the first section 121a of the valve seat 12, so that the guide sleeve 20 can be positioned and guided;

(2) and (3) press-fitting the guide sleeve 20 to enable the lower surface of the mounting boss 21 to be in contact with the step surface of the limiting boss 121c, and tightly fitting the fourth section 212 of the guide sleeve 20 with the second section 121b of the valve seat 12. At this time, a gap with a single side of 0.01mm to 0.04mm exists between the third section 211 of the guide sleeve 20 and the first section 121a of the valve seat 12 as a welding seam, and a welding ring is placed in the welding ring groove 213;

(3) The first pipe fitting and the second pipe fitting are assembled on the valve seat 12, and the first pipe fitting, the second pipe fitting and the guide sleeve 20 are welded with the valve seat 12 in an integrated furnace welding mode.

In a second embodiment of the present invention, an electronic expansion valve is provided, which is different from the first embodiment in that, in the present embodiment, a cross-sectional size of the third section 211 is smaller or larger than a cross-sectional size of the fourth section 212. Specifically, the cross-sectional dimension of the third section 211 is smaller than that of the fourth section 212, a guide section is formed between the third section 211 and the inner wall of the mounting hole 121, and a press-fitting section is formed between the fourth section 212 and the inner wall of the mounting hole 121, so that the distance between the guide sleeve 20 located in the guide section and the housing 10 is larger than the distance between the guide sleeve 20 located in the press-fitting section and the housing 10. In the present embodiment, the third segment 211 is located above the fourth segment 212. In other embodiments, the third segment 211 may be located below the fourth segment 212.

Specifically, the cross-sectional dimension of the third section 211 is 0.02mm to 0.08mm smaller than the cross-sectional dimension of the fourth section 212. By adopting the structure, the distance between the inner wall of the mounting hole 121 and the third section 211 is 0.01mm to 0.04mm, and the inner wall of the mounting hole 121 and the fourth section 212 are in interference fit. Wherein the first section 121a and the second section 121b of the mounting hole 121 have the same diameter.

In the third embodiment of the present invention, compared with the first embodiment, the electronic expansion valve provided in this embodiment is different in that, in this embodiment, the aperture of the first section 121a is larger than the aperture of the second section 121b, the cross-sectional size of the third section 211 is smaller than the cross-sectional size of the fourth section 212, a guide section is formed between the inner wall of the first section 121a and the outer wall of the third section 211, and a press-fitting section is formed between the inner wall of the second section 121b and the outer wall of the fourth section 212, so that the distance between the guide sleeve 20 located in the guide section and the housing 10 is larger than the distance between the guide sleeve 20 located in the press-fitting section and the housing 10. In the present embodiment, the first segment 121a is located above the second segment 121b, and the third segment 211 is located above the fourth segment 212. In other embodiments, the first segment 121a may be disposed below the second segment 121b, and the third segment 211 may be disposed below the fourth segment 212.

The device provided by the embodiment has the following beneficial effects:

(1) when the guide sleeve 20 and the shell 10 are pressed, the guide sleeve 20 can be positioned through the guide section, and the press fitting is convenient;

(2) after the guide sleeve 20 is pressed into the shell 10, the first pipe fitting and the second pipe fitting are assembled on the shell 10, and then the shell 10 assembled with the first pipe fitting, the second pipe fitting and the guide sleeve 20 is welded in an integrated furnace welding mode, so that the process is simple and stable, and the coaxiality of the guide sleeve and the valve body can be effectively ensured;

(3) After the integral furnace is welded, the welding quality can be observed through the guide section, if the solder seeps out, the welding seam is filled, and the welding method is judged to be reliable and efficient;

(4) because the mode of furnace welding is adopted, the material of both the valve seat 12 and the guide sleeve 20 can be selected from sus303, and the trial-manufacturing difficulty and the cost of the valve seat 12 and the guide sleeve can be reduced. In the prior art, the valve seat 12 and the guide sleeve 20 are welded in a laser welding mode, and stainless steel materials with higher strength are needed, so that the cost is higher.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a housing (10);

a guide sleeve (20) disposed within the housing (10);

a rotor (40) rotatably disposed within the housing (10);

the screw (50) is arranged in the shell (10), and the rotor (40) is in driving connection with the screw (50);

the valve needle assembly (60) is movably arranged in the shell (10), one end of the screw rod (50) is connected with the valve needle assembly (60) so as to drive the valve needle assembly (60) to axially move through the screw rod (50);

A guiding section and a press-fitting section which are communicated with each other are arranged between the inner wall of the shell (10) and the outer wall of the guiding sleeve (20), the distance between the guiding sleeve (20) and the shell (10) in the guiding section is larger than the distance between the guiding sleeve (20) and the shell (10) in the press-fitting section, a welding ring groove (213) is further arranged between the inner wall of the shell (10) and the outer wall of the guiding sleeve (20), and the welding ring groove (213) is communicated with the guiding section;

the shell (10) comprises a sleeve (11) and a valve seat (12), the guide sleeve (20) is arranged in the valve seat (12), and the guide section and the press-fitting section are positioned between the guide sleeve (20) and the valve seat (12);

the electronic expansion valve further comprises a first pipe fitting and a second pipe fitting, wherein the first pipe fitting and the second pipe fitting are connected with the valve seat (12), and the guide sleeve (20), the first pipe fitting and the second pipe fitting are welded to the shell (10) in an integrated furnace welding mode.

2. An electronic expansion valve according to claim 1, wherein the valve seat (12) has a mounting hole (121), the guide sleeve (20) is disposed in the mounting hole (121), the mounting hole (121) has a first section (121a) and a second section (121b) connected to each other, an inner wall of the first section (121a) cooperates with the guide sleeve (20) to form the guide section, and an inner wall of the second section (121b) cooperates with the guide sleeve (20) to form the press-fitting section.

3. An electronic expansion valve according to claim 2, wherein the aperture of the first section (121a) is larger than the aperture of the second section (121 b).

4. An electronic expansion valve according to claim 2, wherein the guide sleeve (20) is provided with a mounting boss (21), the mounting boss (21) is circumferentially arranged along a side wall of the guide sleeve (20), and the guide section and the press-fitting section are formed between the side wall of the mounting boss (21) and an inner wall of the mounting hole (121).

5. An electronic expansion valve according to claim 4, wherein the mounting boss (21) comprises a third section (211) and a fourth section (212), the third section (211) being arranged in correspondence with the first section (121a) and the fourth section (212) being arranged in correspondence with the second section (121 b).

6. An electronic expansion valve according to claim 5, wherein the cross-sectional dimension of the third section (211) is equal to the cross-sectional dimension of the fourth section (212).

7. An electronic expansion valve according to claim 5, wherein the cross-sectional dimension of the third section (211) is smaller or larger than the cross-sectional dimension of the fourth section (212).

8. An electronic expansion valve according to claim 5, wherein the mounting boss (21) is provided with a welding ring groove (213), the welding ring groove (213) is located between the third section (211) and the fourth section (212), and the welding ring groove (213) is circumferentially arranged along the side wall of the mounting boss (21).

9. An electronic expansion valve according to claim 4, wherein a limiting boss (121c) is provided in the mounting hole (121), the limiting boss (121c) is located on a side of the second section (121b) away from the first section (121a), and the limiting boss (121c) cooperates with the mounting boss (21) to limit the displacement of the guide sleeve (20) relative to the valve seat (12).

10. An electronic expansion valve according to claim 1, further comprising a nut assembly (30), wherein the guiding sleeve (20) is provided with a nut guiding section (22), and the nut assembly (30) is sleeved on the nut guiding section (22).