Electronic expansion valve

Abstract

The utility model relates to the technical field of air conditioner parts, in particular to an electronic expansion valve. The electronic expansion valve comprises a valve seat part and a connecting pipe, a valve port is formed in the valve seat part, and the connecting pipe is connected to the valve seat part and communicates with the valve port. A capillary channel is arranged in the connecting pipe, the inner diameter of the capillary channel is D1, the inner diameter of the valve port is D, and D1 / D is larger than or equal to 1 and smaller than or equal to 2.5. According to the electronic expansion valve, the problem that in an existing electronic expansion valve structure, high flowing noise is generated after a refrigerant flows through a valve port is solved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioner components, and particularly to an electronic expansion valve. Background Art

[0002] The electronic expansion valve often plays the roles of throttling and pressure reducing and regulating the flow rate in the air conditioning system, and has the advantages of a large flow control range, sensitive response, and fine regulation.

[0003] Currently, the length of the valve port of the electronic expansion valve is usually short, and the channels on both sides of the valve port flow are wider than the width of the valve port. The refrigerant will expand rapidly after passing through the valve port, causing the flow rate of the refrigerant to increase instantaneously. Moreover, since the refrigerant is mostly in a gas-liquid two-phase state after throttling through the valve port, the rapid increase in the refrigerant flow rate will cause the internal bubbles to burst suddenly, generating a large flow noise, which greatly affects the user experience. Utility Model Content

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the refrigerant in the existing electronic expansion valve structure generates a large flow noise after flowing through the valve port.

[0005] This application provides an electronic expansion valve, which includes a valve seat part and a connecting pipe. The valve seat part is provided with a valve port, and the connecting pipe is connected to the valve seat part and communicated with the valve port. Among them, a capillary channel is provided in the connecting pipe, the inner diameter of the capillary channel is D1, and the inner diameter of the valve port is D, satisfying 1≤D1 / D≤2.5.

[0006] In one embodiment, the length of the capillary channel is h, satisfying h≥3D.

[0007] In one embodiment, the whole inside the connecting pipe forms the capillary channel.

[0008] In one embodiment, a part inside the connecting pipe forms the capillary channel, and the inner diameter of the capillary channel is less than or equal to the inner diameter of other parts of the connecting pipe.

[0009] In one embodiment, at least part of the connecting pipe contracts radially along the connecting pipe to form the capillary channel.

[0010] In one embodiment, the capillary channel is arranged at one end of the connecting pipe close to the valve port, or the capillary channel is arranged at an interval from the valve port.

[0011] In one embodiment, the connecting pipe includes a capillary tube section and a joint section which are separately arranged. One end of the capillary tube section is connected to the valve seat part, and the other end is connected to the joint section. Among them, at least part of the inside of the capillary tube section forms the capillary channel.

[0012] In one embodiment, the capillary tube section is a stainless steel part, and / or the joint section is a copper part.

[0013] In one embodiment, the electronic expansion valve further includes a connecting pipe, the connecting pipe is connected to the valve seat portion, and the connecting pipe communicates with the connecting pipe through the valve port; wherein, a capillary channel is provided or not provided in the connecting pipe.

[0014] In one embodiment, the valve seat portion is provided with a first assembly hole and a second assembly hole communicating with the valve port, the first assembly hole is provided at an end of the valve seat portion, and the second assembly hole is provided on the circumferential side of the valve seat portion; wherein, one of the connecting pipe and the connecting pipe is inserted and connected to the first assembly hole, and the other is inserted and connected to the second assembly hole.

[0015] In one embodiment, the valve seat portion includes a main valve seat and a sub-valve seat connected to each other; the main valve seat is provided with an installation hole, the sub-valve seat is installed in the installation hole, and at least a part of the sub-valve seat protrudes from the main valve seat, wherein the valve port and the first assembly hole are provided in the sub-valve seat, and the second assembly hole is provided in the main valve seat; or, an installation groove is formed in the main valve seat, the sub-valve seat is installed in the installation groove, wherein the valve port is provided in the sub-valve seat, the first assembly hole is provided in the sub-valve seat and / or the main valve seat, and the second assembly hole is provided in the main valve seat; or, the sub-valve seat is sleeved on one end of the main valve seat, wherein the first assembly hole is provided in the sub-valve seat, and the valve port and the second assembly hole are provided in the main valve seat.

[0016] In one embodiment, the capillary channel is arranged close to the valve seat portion.

[0017] In one embodiment, the valve seat portion includes a main valve seat and a sub-valve seat connected to each other, the main valve seat is provided with an installation hole, the sub-valve seat is installed in the installation hole, and at least a part of the sub-valve seat protrudes from the main valve seat; wherein, the connecting pipe or the connecting pipe is sleeved on the part of the sub-valve seat protruding from the main valve seat.

[0018] In one embodiment, the capillary channel is arranged at an interval from the valve seat portion.

[0019] Compared with the prior art, for the electronic expansion valve provided in this application, by arranging a capillary channel in the connecting pipe, when the high-speed refrigerant generated after throttling through the valve port flows towards the connecting pipe, due to the relatively small inner diameter of the capillary channel, the capillary channel will generate a large flow resistance to the flow of the refrigerant, thereby being able to slow down the flow rate of the refrigerant. And the reduction of the refrigerant flow rate can effectively reduce the rupture frequency of the bubbles in the refrigerant, thus greatly reducing the noise of the refrigerant. Moreover, the inner diameter D1 of the capillary channel and the inner diameter D of the valve port are set such that 1 ≤ D1 / D ≤ 2.5, which further ensures the flow rate reduction effect of the capillary channel on the refrigerant, enabling the noise of the refrigerant to be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a partial cross-sectional view of an electronic expansion valve provided in an embodiment of this application;

[0022] Figure 2 is a partial cross-sectional view of an electronic expansion valve provided in another embodiment of this application;

[0023] Figure 3 is a partial cross-sectional view of an electronic expansion valve provided in yet another embodiment of this application;

[0024] Figure 4 is a partial cross-sectional view of an electronic expansion valve provided in still another embodiment of this application.

[0025] The meanings represented by the symbols in the figures are as follows:

[0026] 100, electronic expansion valve; 10, valve seat part; 101, valve port; 102, first assembly hole; 103, second assembly hole; 104, mounting hole; 11, main valve seat; 12, auxiliary valve seat; 20, connecting pipe; 201, capillary channel; 21, capillary tube section; 22, joint section; 30, communicating pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the above objects, features, and advantages of this application more obvious and understandable, the following will provide a detailed description of the specific embodiments of this application with reference to the drawings. Many specific details are set forth in the following description to facilitate a full understanding of this application. However, this application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are only for illustrative purposes and do not represent the only implementation.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and defined, the first feature may be in direct contact with the second feature on "upper" or "lower" of the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on the top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under the bottom of" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0032] The electronic expansion valve often plays the roles of throttling and pressure reducing and regulating the flow rate in the air-conditioning system, and has the advantages of a large flow control range, sensitive response, fine regulation, etc.

[0033] Currently, the valve port length of the electronic expansion valve is usually short, and the channels on both sides of the valve port flow are wider compared to the width of the valve port. The refrigerant will expand rapidly after passing through the valve port, causing the refrigerant flow rate to instantaneously increase. Moreover, since the refrigerant is mostly in a gas-liquid two-phase state after throttling through the valve port, the increase in the refrigerant flow rate will cause the internal bubbles to burst rapidly, thereby generating a large flow noise, which greatly affects the user experience.

[0034] Please refer to Figures 1-4 , to solve the problem that the refrigerant in the existing electronic expansion valve structure will generate a large flow noise after flowing through the valve port, the present application provides an electronic expansion valve 100. The electronic expansion valve 100 includes a valve seat portion 10 and a connecting pipe 20. The valve seat portion 10 is provided with a valve port 101, and the connecting pipe 20 is connected to the valve seat portion 10 and communicates with the valve port 101. Wherein, a capillary channel 201 is provided in the connecting pipe 20, the inner diameter of the capillary channel 201 is D1, and the inner diameter of the valve port 101 is D, satisfying 1≤D1 / D≤2.5.

[0035] It can be understood that, by providing the capillary channel 201 in the connecting pipe 20 in the present application, when the high-speed refrigerant generated after throttling through the valve port 101 flows towards the connecting pipe 20, due to the small inner diameter of the capillary channel 201, the capillary channel 201 will generate a large flow resistance to the flow of the refrigerant, thereby being able to slow down the flow rate of the refrigerant. And the reduction of the refrigerant flow rate can effectively reduce the rupture frequency of the bubbles in the refrigerant, thereby greatly reducing the noise of the refrigerant. Moreover, the inner diameter D1 of the capillary channel 201 and the inner diameter D of the valve port 101 are set to 1≤D1 / D≤2.5, which further ensures the speed reduction effect of the capillary channel 201 on the refrigerant, so that the noise of the refrigerant can be further reduced.

[0036] Specifically, when D1 / D>2.5, the inner diameter of the capillary channel 201 is relatively large, the flow resistance generated on the refrigerant is reduced, and there is a greater risk of rupture of the bubbles in the refrigerant. And when D1 / D<1, the inner diameter of the capillary channel 201 is relatively small, which will generate a large flow resistance to the refrigerant, which is not conducive to the smooth flow of the refrigerant and subsequent heat exchange. Exemplarily, D1 / D can be set to 1, 1.5, 2 or 2.5, etc., and will not be listed one by one here.

[0037] Furthermore, in an embodiment, the length of the capillary channel 201 is h, satisfying h≥3D. In this way, by extending the length of the capillary channel 201, a better speed reduction effect on the refrigerant can be achieved.

[0038] In an embodiment, the entire inside of the connecting pipe 20 forms the capillary channel 201, that is, the connecting pipe 20 is integrally configured as a capillary structure, and the structure is simpler.

[0039] In an embodiment, a part of the inside of the connecting pipe 20 forms the capillary channel 201, and the inner diameter of the capillary channel 201 is less than or equal to the inner diameter of other parts of the connecting pipe 20. In this way, the formation of the capillary channel 201 can also be realized, so as to achieve a speed reduction effect on the refrigerant.

[0040] Specifically, in an embodiment, as Figures 1-3As shown, at least a part of the connecting pipe 20 contracts radially along the connecting pipe 20 to form a capillary channel 201. That is, in this embodiment, the capillary channel 201 is directly formed by necking down the connecting pipe 20, with simple molding, which can greatly reduce the processing difficulty of the capillary channel 201. Moreover, compared with the traditional scheme of setting a throttling device in the connecting pipe 20, the structure of this embodiment greatly reduces the manufacturing cost.

[0041] Among them, the capillary channel 201 can be arranged at one end of the connecting pipe 20 close to the valve port 101, or the capillary channel 201 can be arranged at an interval from the valve port 101. It can be understood that the position of the capillary channel 201 on the connecting pipe 20 can be reasonably set according to actual needs as long as it can achieve the same effect of reducing the refrigerant flow rate.

[0042] In another embodiment, as Figure 4 shown, the connecting pipe 20 includes a capillary tube section 21 and a joint section 22 that are separately arranged. One end of the capillary tube section 21 is connected to the valve seat portion 10, and the other end is connected to the joint section 22 and is connected to the external pipeline through the joint section 22. Among them, at least a part of the capillary tube section 21 forms a capillary channel 201.

[0043] In this way, forming the capillary channel 201 through the capillary tube section 21 can also achieve the effect of reducing the refrigerant flow rate, and the setting of the joint section 22 facilitates the connection between the capillary tube section 21 and the external pipeline, which is beneficial to improving the overall processing efficiency.

[0044] Generally, the connecting pipe 20 and the valve seat portion 10 as well as the external pipeline are all welded structures. To facilitate the welding between the connecting pipe 20 and the valve seat portion 10, the capillary tube section 21 and the valve seat portion 10 can both be set as stainless steel parts. By using the same material for processing and forming, the welding between the two is simpler, and the cost of stainless steel is lower, which can greatly reduce the cost of the electronic expansion valve 100. Moreover, since the pipelines in the air conditioner are usually copper pipes, to facilitate the welding between the connecting pipe 20 and the external air conditioner pipeline, this application preferably sets the joint section 22 as a copper part.

[0045] Furthermore, when the connecting pipe 20 is an integral structure, the connecting pipe 20 can also be integrally set as a copper part to reduce the connection difficulty between the connecting pipe 20 and the external pipeline.

[0046] In one embodiment, as Figures 1-4 shown, the electronic expansion valve 100 further includes a communicating pipe 30. The communicating pipe 30 is connected to the valve seat portion 10, and the communicating pipe 30 communicates with the connecting pipe 20 through the valve port 101. Among them, a capillary channel 201 is provided or not provided in the communicating pipe 30.

[0047] Generally, the electronic expansion valve 100 can achieve bidirectional flow of the refrigerant. At this time, a capillary channel 201 can be provided in the connecting pipe 30 to decelerate the refrigerant both when it flows in and out. When the electronic expansion valve 100 is used as a one-way valve, the connecting pipe 20 is preferably arranged behind the valve port 101. At this time, since the capillary channel 201 in a single connecting pipe 20 can achieve noise reduction, the capillary channel 201 may not be provided in the connecting pipe 30, thus making the cost of the electronic expansion valve 100 lower. Of course, in other embodiments, the connecting pipe 20 may also be arranged in front of the valve port 101, which can be reasonably set according to actual needs.

[0048] Specifically, both the connecting pipe 20 and the connecting pipe 30 can serve as the inlet and outlet of the refrigerant. Among them, in this application, the connecting pipe 20 is specifically used as the refrigerant outlet, and the connecting pipe 30 is used as the refrigerant inlet, and an example is given where the connecting pipe 30 is provided with a capillary channel 201. Since the capillary channel 201 is provided on both the connecting pipe 20 and the connecting pipe 30, when the refrigerant flows from the connecting pipe 30 to the valve port 101, it can be decelerated in advance in the corresponding capillary channel 201 on the connecting pipe 30. Then, when the refrigerant flows from the valve port 101 to the connecting pipe 20, it is decelerated for the second time through the capillary channel 201 in the connecting pipe 20, thereby further improving the noise reduction effect on the refrigerant.

[0049] In addition, when the connecting pipe 30 is used as the refrigerant outlet and the connecting pipe 20 is used as the refrigerant inlet, the principle is the same and will not be elaborated here.

[0050] It should be noted that the structure of the connecting pipe 30 can be set to be the same as or different from that of the connecting pipe 20. For example, the connecting pipe 20 can be of an integral design, while the connecting pipe 30 can be set to a split structure composed of a capillary section 21 and a joint section 22, which will not be limited here.

[0051] In one embodiment, as Figure 1 shown, the valve seat portion 10 is provided with a first assembly hole 102 and a second assembly hole 103 communicating with the valve port 101. The first assembly hole 102 is provided at the end of the valve seat portion 10, and the second assembly hole 103 is provided on the circumferential side of the valve seat portion 10. Among them, one of the connecting pipe 30 and the connecting pipe 20 is inserted and connected to the first assembly hole 102, and the other is inserted and connected to the second assembly hole 103.

[0052] Here, the valve seat portion 10 can be of an integral structure or a split structure. When the valve seat portion 10 is of an integral structure, by directly providing the valve port 101 and the first assembly hole 102 on the valve seat portion 10, the assembly process of the valve seat portion 10 can be reduced, and the assembly efficiency can be improved. At the same time, the size of the valve seat portion 10 is small, which can reduce the material cost of the valve seat portion 10.

[0053] When the valve seat portion 10 has a split structure, exemplarily, in one embodiment, the valve seat portion 10 may include a main valve seat 11 and a sub-valve seat 12 connected to each other, so as to facilitate the machining of the valve port 101, etc., and reduce the machining difficulty.

[0054] Wherein, the connection between the main valve seat 11 and the sub-valve seat 12 can be connected by, but not limited to, the following methods:

[0055] In one embodiment, as Figures 2-4 shown, the main valve seat 11 is provided with an installation hole 104, the sub-valve seat 12 is installed in the installation hole 104, and at least a part of the sub-valve seat 12 protrudes from the main valve seat 11. Wherein, the valve port 101 and the first assembly hole 102 are provided in the sub-valve seat 12, and the second assembly hole 103 is provided in the main valve seat 11.

[0056] In another embodiment, an installation groove (not shown in the figure) is formed in the main valve seat 11, and the sub-valve seat 12 is installed in the installation groove. Wherein, the valve port 101 is provided in the sub-valve seat 12, the first assembly hole 102 can be provided in the sub-valve seat 12 and / or the main valve seat 11, and the second assembly hole 103 is provided in the main valve seat 11.

[0057] In yet another embodiment, the sub-valve seat 12 is sleeved on one end of the main valve seat 11. Wherein, the first assembly hole 102 is provided in the sub-valve seat 12, and the valve port 101 and the second assembly hole 103 are provided in the main valve seat 11.

[0058] To reduce the size of the valve seat portion 10 and thus reduce the cost, in the above connection methods of the main valve seat 11 and the sub-valve seat 12, when the connecting pipe 20 is connected to the first assembly hole 102, it is preferably to arrange the capillary channel 201 close to the valve seat portion 10, that is, at least a part of the capillary channel 201 is arranged at one end of the connecting pipe 20 close to the first assembly hole 102.

[0059] It should be noted that if the connecting pipe 30 is connected to the first assembly hole 102 and the connecting pipe 30 is provided with a capillary channel 201, it is also preferably to arrange at least a part of the capillary channel 201 at one end of the connecting pipe 30 close to the first assembly hole 102.

[0060] Further, when at least a part of the sub-valve seat 12 protrudes from the main valve seat 11, the connecting pipe 20 or the connecting pipe 30 can also be sleeved on the part of the sub-valve seat 12 that protrudes from the main valve seat 11, so as to realize the connection with the valve seat portion 10. At this time, the capillary channel 201 can be arranged at an interval from the valve seat portion 10 to facilitate the connection between the two.

[0061] In addition, in the connecting pipe 20 or the connecting pipe 30 connected to the second assembly hole 103, the capillary channel 201 can be arranged at one end close to the second assembly hole 103 according to actual needs or the capillary channel 201 can be arranged at an interval from the valve seat portion 10 to reduce the cost or improve the connection strength.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0063] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. An electronic expansion valve, characterized in that: It comprises a valve seat portion (10) and a connecting pipe (20), wherein the valve seat portion (10) is provided with a valve port (101), and the connecting pipe (20) is connected to the valve seat portion (10) and communicates with the valve port (101); Wherein, a capillary channel (201) is provided in the connecting tube (20), the inner diameter of the capillary channel (201) is D1, and the inner diameter of the valve port (101) is D, satisfying 1≤D1 / D≤2.

5.

2. The electronic expansion valve according to claim 1, characterized in that: The length of the capillary channel (201) is h, satisfying h≥3D.

3. The electronic expansion valve according to claim 1, characterized in that: The entire interior of the connecting tube (20) forms the capillary channel (201).

4. The electronic expansion valve according to claim 1, characterized in that: The portion inside the connecting tube (20) forms the capillary channel (201), and the inner diameter of the capillary channel (201) is smaller than or equal to the inner diameter of other portions on the connecting tube (20).

5. The electronic expansion valve according to claim 4, characterized in that: At least a portion of the connecting tube (20) contracts along the radial direction of the connecting tube (20) to form the capillary channel (201).

6. The electronic expansion valve according to claim 5, characterized in that: The capillary channel (201) is arranged at one end of the connecting tube (20) close to the valve port (101), or the capillary channel (201) and the valve port (101) are arranged at a distance.

7. The electronic expansion valve according to claim 4, characterized in that: The connecting pipe (20) comprises a capillary section (21) and a joint section (22) which are separately arranged; one end of the capillary section (21) is connected to the valve seat portion (10), and the other end is connected to the joint section (22); Wherein, at least a portion of the capillary segment (21) forms the capillary channel (201).

8. The electronic expansion valve according to claim 7, characterized in that: The capillary section (21) is a stainless steel part, and / or the joint section (22) is a copper part.

9. The electronic expansion valve according to any one of claims 1 to 8, characterized in that: The electronic expansion valve further comprises a connecting pipe (30), wherein the connecting pipe (30) is connected to the valve seat portion (10), and the connecting pipe (30) is connected to the connecting pipe (20) through the valve port (101); Wherein, the connecting tube (30) is provided with the capillary channel (201) or is not provided with the capillary channel (201).

10. The electronic expansion valve according to claim 9, characterized in that: The valve seat portion (10) is provided with a first assembly hole (102) and a second assembly hole (103) which are communicated with the valve port (101), wherein the first assembly hole (102) is provided at an end of the valve seat portion (10), and the second assembly hole (103) is provided at a peripheral side of the valve seat portion (10); Wherein, one of the connecting pipe (30) and the connecting pipe (20) is inserted into and connected to the first assembly hole (102), and the other is inserted into and connected to the second assembly hole (103).

11. The electronic expansion valve according to claim 10, characterized in that: The valve seat portion (10) comprises a main valve seat (11) and a secondary valve seat (12) which are connected to each other; The main valve seat (11) is provided with a mounting hole (104), the auxiliary valve seat (12) is mounted on the mounting hole (104), and at least a portion of the auxiliary valve seat (12) protrudes from the main valve seat (11), wherein the valve port (101) and the first assembly hole (102) are provided on the auxiliary valve seat (12), and the second assembly hole (103) is provided on the main valve seat (11); Alternatively, a mounting groove is formed in the main valve seat (11), and the auxiliary valve seat (12) is mounted in the mounting groove, wherein the valve port (101) is opened in the auxiliary valve seat (12), the first assembly hole (102) is opened in the auxiliary valve seat (12) and / or the main valve seat (11), and the second assembly hole (103) is opened in the main valve seat (11); Alternatively, the auxiliary valve seat (12) is sleeved on one end of the main valve seat (11), wherein the first assembly hole (102) is opened on the auxiliary valve seat (12), and the valve port (101) and the second assembly hole (103) are opened on the main valve seat (11).

12. The electronic expansion valve according to claim 10, characterized in that: The capillary channel (201) is arranged close to the valve seat portion (10).

13. The electronic expansion valve according to claim 9, characterized in that: The valve seat portion (10) comprises a main valve seat (11) and an auxiliary valve seat (12) which are connected to each other, the main valve seat (11) is provided with a mounting hole (104), the auxiliary valve seat (12) is mounted in the mounting hole (104), and at least a portion of the auxiliary valve seat (12) protrudes from the main valve seat (11); Wherein, the connecting pipe (20) or the communicating pipe (30) is sleeved on a portion of the auxiliary valve seat (12) protruding from the main valve seat (11).

14. The electronic expansion valve according to claim 13, characterized in that: The capillary channel (201) and the valve seat portion (10) are arranged at a distance.

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