Electronic expansion valve

Abstract

The utility model relates to the technical field of valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a main valve seat, a valve seat core and a valve core sleeve, and a main valve cavity is formed in the main valve seat. The valve seat core is arranged in the main valve seat, a flowing gap is defined between the outer wall of the valve seat core and the inner wall of the main valve seat, the valve seat core is provided with a first flowing cavity and a first hole unit communicated with the first flowing cavity, and the first hole unit is communicated with the flowing gap. The valve element sleeve is movably installed in the main valve cavity, and the valve element sleeve can move in the direction close to or away from the valve seat element in the axial direction so as to open or block the flowing gap. According to the electronic expansion valve provided by the invention, the problem that the opening degree of an existing electronic expansion valve is influenced by the moving position of the valve needle component when a refrigerant flows reversely is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is a key component in an air conditioning system, mainly used for regulating flow and throttling pressure reduction. At present, some electronic expansion valves are combined with a check valve function. In such electronic expansion valves, the structure generally includes a valve seat, a valve needle component, a nut sleeve, and a check valve.

[0003] In the related art, a large valve port is formed in the valve seat, and a small valve port is formed in the check valve. The valve needle component can cooperate with the small valve port on the check valve to regulate small flow. When the refrigerant flows forward, the check valve will be abutted against the large valve port under the action of pressure difference or the valve needle component, thereby closing the large valve port. At this time, the valve needle component cooperates with the small valve port on the check valve to regulate flow. When the refrigerant flows reversely, the check valve has a tendency to move away from the large valve port under the action of pressure difference, and the position of the valve needle component will interfere with the movement of the check valve. To release the freedom of movement of the check valve, the valve needle component also needs to move away from the large valve port. During the movement of the valve needle component, the check valve can maintain abutment with the valve needle component under the action of pressure difference. Therefore, when the refrigerant flows reversely, the movement position of the valve needle component will affect the movement position of the check valve, thereby affecting the opening degree of the large valve port, which reduces the response speed of the electronic expansion valve when the refrigerant flows reversely. SUMMARY

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem that the opening degree of the existing electronic expansion valve is affected by the movement position of the valve needle component when the refrigerant flows reversely.

[0005] The present application provides an electronic expansion valve, which comprises a main valve seat, a valve seat core, and a valve core sleeve. A main valve cavity is formed in the main valve seat. The valve seat core is arranged in the main valve seat, and a flow gap is formed between the outer wall of the valve seat core and the inner wall of the main valve seat. The valve seat core has a first flow-through cavity and a first hole unit in communication with the first flow-through cavity. The first hole unit is in communication with the flow gap. The valve core sleeve is movably arranged in the main valve cavity and can move towards or away from the valve seat core in the axial direction to open or block the flow gap.

[0006] In one embodiment, the total flow-through area of the first hole unit is greater than or equal to the flow-through area of the first flow-through cavity.

[0007] In one embodiment, the flow-through area of the flow gap is greater than or equal to the total flow-through area of the first hole unit.

[0008] In one of the embodiments, the first hole unit comprises a plurality of first flow-through holes, which are distributed at intervals on the side wall of the valve seat core.

[0009] In one of the embodiments, the valve core sleeve comprises a cylinder body and a sealing member, which is installed on one end of the cylinder body and abuts against the opening of the flow gap when the valve core sleeve blocks the flow gap.

[0010] In one of the embodiments, one end of the cylinder body is provided with a mounting groove, and the sealing member comprises a main body portion, which is installed in the mounting groove and has an outer side wall in interference or transition fit with an inner side wall of the mounting groove.

[0011] In one of the embodiments, the sealing member further comprises an abutting portion, one end of which is connected to the main body portion and the other end of which at least partially extends out of the mounting groove; wherein the surface of the abutting portion away from the one end of the main body portion is arc-shaped.

[0012] In one of the embodiments, the main valve seat is further provided with a mounting hole, which is located at one end of the main valve cavity and communicates with the main valve cavity; wherein one end of the valve seat core is provided with a boss protruding therefrom, which is inserted into the mounting hole.

[0013] In one of the embodiments, the valve seat core is further provided with a valve port, which communicates with the first flow-through cavity; the valve core sleeve has a second flow-through cavity, and the electronic expansion valve further comprises a valve core assembly, which is movably installed in the main valve cavity and at least partially inserted into the second flow-through cavity and can move in the axial direction towards or away from the valve port to adjust the flow rate at the valve port; wherein the side wall of the valve core sleeve is provided with a second hole unit, which communicates the second flow-through cavity and the main valve cavity.

[0014] In one of the embodiments, the electronic expansion valve further comprises a nut sleeve, which is installed in the main valve cavity and fixedly connected with the main valve seat, and the nut sleeve is provided with a nut inner hole; one end of the valve core sleeve is inserted into the nut inner hole, and the outer wall of the valve core sleeve is in sliding guide fit with the inner wall of the nut inner hole, and the outer wall of the valve core assembly is provided with a guide surface, which is in sliding guide fit with the inner wall of the nut inner hole.

[0015] In one of the embodiments, the nut inner hole has a first inner hole and a second inner hole axially through the electronic expansion valve, the first inner hole is arranged at one end of the second inner hole away from the valve port; wherein one end of the valve core sleeve is inserted into the second inner hole, and the outer wall of the valve core sleeve is in sliding guide cooperation with the inner wall of the second inner hole, and the guide surface on the valve core assembly is in synchronous sliding guide cooperation with the inner wall of the first inner hole and the inner wall of the second flow cavity.

[0016] In one of the embodiments, the outer wall of the nut sleeve is in interference or transition cooperation with the inner wall of the main valve cavity.

[0017] Compared with the prior art, the electronic expansion valve provided by the application can directly move the valve core sleeve away from the valve seat core under the action of the pressure difference force when the refrigerant flows reversely, so as to open the flow gap, at this time, the refrigerant in the first flow cavity can flow into the main valve cavity through the first hole unit and the flow gap, and the flow is realized. In this way, when the refrigerant flows reversely, the opening degree of the flow gap reaches the maximum as long as the valve core sleeve opens the flow gap, and the flow rate can remain unchanged during the continuous movement of the valve core sleeve, so that the flow performance of the refrigerant can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 A cross-sectional view of the electronic expansion valve provided by one embodiment of the application (refrigerant flows forward);

[0020] Figure 2 A cross-sectional view of the electronic expansion valve provided by one embodiment of the application (refrigerant flows reversely); Figure 1 An enlarged view of A in the middle;

[0021] Figure 3 A cross-sectional view of the electronic expansion valve provided by one embodiment of the application (refrigerant flows reversely);

[0022] Figure 4 An enlarged view of B in the middle. Figure 3

[0023] The meanings of the symbols in the drawings are as follows:

[0024] ​100, electronic expansion valve; 10, main valve seat; 101, main valve cavity; 102, flow gap; 103, mounting hole; 20, valve seat core; 201, first flow cavity; 202, first hole unit; 2021, first flow hole; 203, valve port; 21, boss; 30, valve core assembly; 301, guide surface; 31, screw rod; 32, valve needle; 33, spring sleeve; 40, valve core sleeve; 401, second flow cavity; 402, second hole unit; 4021, second flow hole; 403, mounting groove; 41, cylinder; 42, sealing element; 421, main body; 422, abutting portion; 50, nut sleeve; 501, first inner hole; 502, second inner hole; 60, first connecting pipe; 70, second connecting pipe. DETAILED DESCRIPTION

[0025] To make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the description of the present application are for the purpose of illustration only, and do not indicate the only implementation.

[0027] In addition, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0028] In the present application, unless specifically defined and limited otherwise, the first feature is "on", "under", "above" or "over" the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature is "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0030] Electronic expansion valve is a key component in air conditioning system, mainly used for regulating flow and throttling pressure reduction. At present, some electronic expansion valves are combined with check valve function, and the structure of such electronic expansion valve generally includes valve seat, valve needle component, nut sleeve and check valve.

[0031] In the related art, a large valve port is formed on the valve seat, and a small valve port is formed on the check valve. The valve needle component can cooperate with the small valve port on the check valve to regulate small flow. When the refrigerant flows forward, the check valve will be abutted against the large valve port under the action of pressure difference or the valve needle component, so as to close the large valve port. At this time, the valve needle component cooperates with the small valve port on the check valve to regulate flow. When the refrigerant flows reversely, the check valve has a tendency to move away from the large valve port under the action of pressure difference, and the position of the valve needle component will interfere with the movement of the check valve. In order to release the freedom degree of movement of the check valve, the valve needle component also needs to move away from the large valve port. During the movement of the valve needle component, the check valve can be in abutment with the valve needle component under the action of pressure difference. Therefore, when the refrigerant flows reversely, the movement position of the valve needle component will affect the movement position of the check valve, thereby affecting the opening degree of the large valve port, which reduces the response speed of the electronic expansion valve when the refrigerant flows reversely.

[0032] Please refer to Figures 1-4To solve the problem that the opening degree of the existing electronic expansion valve is affected by the moving position of the valve needle component when the refrigerant flows reversely, the present application provides an electronic expansion valve 100, which comprises a main valve seat 10, a valve seat core 20, a valve core assembly 30 and a valve core sleeve 40, and a main valve cavity 101 is formed in the main valve seat 10. The valve seat core 20 is arranged in the main valve seat 10, and a flow gap 102 is formed between the outer wall of the valve seat core 20 and the inner wall of the main valve seat 10. The valve seat core 20 has a first flow-through cavity 201, a first hole unit 202 and a valve port 203 which are in communication with the first flow-through cavity 201, and the first hole unit 202 is in communication with the flow gap 102. Furthermore, a first connecting pipe 60 is connected to the side wall of the main valve seat 10, the first connecting pipe 60 is in communication with the main valve cavity 101, and a second connecting pipe 70 is connected to the main valve seat 10 at the position of the valve seat core 20, the second connecting pipe 70 is in communication with the first flow-through cavity 201.

[0033] The electronic expansion valve 100 provided by the present application can be used as a bidirectional valve, that is, the refrigerant can flow into the main valve cavity 101 through the first connecting pipe 60 and flow out through the second connecting pipe 70, which is the forward flow of the refrigerant. Alternatively, the refrigerant can flow into the main valve cavity 101 through the second connecting pipe 70 and flow out through the first connecting pipe 60, which is the reverse flow of the refrigerant.

[0034] Further, as shown in Figures 1-4 , the valve core assembly 30 is movably arranged in the main valve cavity 101, the valve core sleeve 40 is movably arranged in the main valve cavity 101, and the valve core sleeve 40 has a second flow-through cavity 401, at least part of the valve core assembly 30 is inserted into the second flow-through cavity 401 and can move in the axial direction towards or away from the valve port 203 to adjust the flow at the valve port 203. The side wall of the valve core sleeve 40 is also provided with a second hole unit 402, and the second hole unit 402 is in communication with the second flow-through cavity 401 and the main valve cavity 101. As shown in Figure 1 and Figure 2 , when the valve core sleeve 40 blocks the flow gap 102, the first flow-through cavity 201 can be in communication with the main valve cavity 101 through the valve port 203, the second flow-through cavity 401 and the second hole unit 402 in sequence. As shown in Figure 3 and Figure 4 , when the valve core sleeve 40 opens the flow gap 102, the first flow-through cavity 201 can be in communication with the main valve cavity 101 through the first hole unit 202 and the flow gap 102 in sequence.

[0035] It can be understood that, since the valve port 203 is formed on the valve seat core 20, the valve core assembly 30 does not need to cooperate with the valve core sleeve 40 for small flow adjustment, but can directly cooperate with the valve port 203 on the valve seat core 20, and the valve core sleeve 40 can only move under the action of gravity or fluid pressure difference force without being interfered by the valve core assembly 30. At the same time, the flow gap 102 is formed by cooperation of the valve seat core 20 and the main valve seat 10, when the refrigerant flows forward, the valve core sleeve 40 can be blocked in the opening of the flow gap 102 under the action of gravity and pressure difference force, at this time, the valve core assembly 30 realizes throttling by cooperating with the valve port 203. When the refrigerant flows reversely, the valve core sleeve 40 can directly move away from the valve seat core 20 under the action of pressure difference force without being hindered by the valve core assembly 30, so as to smoothly open the flow gap 102, at this time, the refrigerant in the first flow cavity 201 can flow to the main valve cavity 101 through the first hole unit 202 and the flow gap 102, realizing flow. In this way, when the refrigerant flows reversely, as long as the valve core sleeve 40 opens the flow gap 102, the opening degree reaches the maximum, and the flow can remain unchanged during the continuous movement of the valve core sleeve 40, so as to improve the flow performance of the refrigerant.

[0036] It should be noted that, when the refrigerant flows reversely, the valve core assembly 30 does not need to move, and can maintain the cooperation state with the valve port 203, so as to reduce the driving cost. That is, during the reverse opening of the valve, the valve core assembly 30 can remain at the position in the full-closed state, at this time, the valve core assembly 30 can abut against the valve port 203 to realize the blocking of the valve port 203, or can be arranged at a certain interval from the valve port 203 to keep a certain flow when the valve is closed. In this way, different cooperation forms can meet different use requirements.

[0037] In an embodiment, the total flow area of the first hole unit 202 is greater than or equal to the flow area of the first flow cavity 201. In this way, the first hole unit 202 does not have a throttling effect on the flow of the refrigerant when it flows reversely. Since the first flow cavity 201 is communicated with the second connecting pipe 70, here the cross-sectional area of the opening of the first flow cavity 201 close to the second connecting pipe 70 can be taken as the flow area of the first flow cavity 201.

[0038] Specifically, the first hole unit 202 includes a plurality of first flow holes 2021, and the plurality of first flow holes 2021 are distributed at intervals on the side wall of the valve seat core 20. In this way, the flow uniformity of the refrigerant when it flows reversely can be improved. Here, the total flow area of the first hole unit 202 refers to the sum of the flow areas of the plurality of first flow holes 2021. That is, in this embodiment, the number of the first flow holes 2021 is at least two.

[0039] Furthermore, in one embodiment, the flow area of ​​the flow gap 102 is greater than or equal to the total flow area of ​​the first orifice unit 202. Thus, the flow gap 102 does not have a throttling effect on the flow of the refrigerant during reverse flow.

[0040] In summary, through the above settings, when the refrigerant flows in reverse, that is, from the first flow chamber 201 to the main valve chamber 101, the flow area of ​​each flow channel remains unchanged or tends to increase. Therefore, it will not throttle the flow of the refrigerant, thereby achieving the effect of full reverse flow and increasing the flow efficiency of the refrigerant.

[0041] In one embodiment, such as Figures 1-4 As shown, the valve core sleeve 40 includes a cylinder 41 and a seal 42. The seal 42 is installed at one end of the cylinder 41. When the valve core sleeve 40 blocks the flow gap 102, the seal 42 abuts against the opening of the flow gap 102. A second flow cavity 401 is provided through the cylinder 41 and the seal 42, and a second hole unit 402 is formed on the side wall of the cylinder 41.

[0042] The seal 42 effectively seals the flow gap 102, ensuring that the refrigerant can only flow through the valve port 203 during forward flow, thereby improving the reliability of the throttling function of the valve core assembly 30. The seal 42 can be a gasket, achieving a soft seal at the opening of the flow gap 102.

[0043] Specifically, when the refrigerant flows in the forward direction, it enters the main valve chamber 101 through the first connecting pipe 60, and then sequentially passes through the second orifice unit 402, the second flow chamber 401, the valve port 203, and the first flow chamber 201 before entering the second connecting pipe 70. In this embodiment, the second orifice unit 402 includes a plurality of second flow holes 4021, which are spaced apart on the side wall of the cylinder 41 to improve the uniformity of refrigerant flow.

[0044] Furthermore, in one embodiment, a mounting groove 403 is provided at one end of the cylinder 41, and the seal 42 includes a main body 421, which is installed in the mounting groove 403, with the outer side wall of the main body 421 and the inner side wall of the mounting groove 403 having an interference fit or transition fit. This improves the secure installation of the seal 42 and reduces the probability of the seal 42 detaching.

[0045] In one embodiment, the seal 42 further includes an abutment portion 422, one end of which is connected to the main body portion 421, and the other end at least partially extends out of the mounting groove 403. The surface of the abutment portion 422 away from the main body portion 421 is arc-shaped. This facilitates a sealing fit between the seal 42 and the flow gap 102, improving the reliability of the seal.

[0046] Specifically, the flow gap 102 and the seal 42 are both annularly arranged.

[0047] In an embodiment, as shown in Figure 2 and Figure 4 The main valve seat 10 and the valve seat core 20 are separately arranged, and the main valve seat 10 is further provided with a mounting hole 103 which is arranged at one end of the main valve cavity 101 and communicates with the main valve cavity 101. One end of the valve seat core 20 is provided with a boss 21 which is inserted into the mounting hole 103 to position the valve seat core 20, which is conducive to improving the coaxiality of the assembly of the valve seat core 20 and the main valve seat 10.

[0048] Further, the second connecting pipe 70 can be inserted into the mounting hole 103 from the other end of the mounting hole 103 and abut against the boss 21 on the valve seat core 20, which is conducive to positioning the second connecting pipe 70. Here, the main valve seat 10, the valve seat core 20 and the second connecting pipe 70 can be subsequently fixed together by a furnace welding, which is simple and fast.

[0049] In other embodiments, the main valve seat 10 and the valve seat core 20 can also be of an integrated structure, which can be reasonably arranged according to actual needs.

[0050] In an embodiment, as shown in Figures 1-4 The electronic expansion valve 100 further comprises a nut sleeve 50 which is installed in the main valve cavity 101 and fixedly connected with the main valve seat 10, and the nut sleeve 50 is provided with a nut inner hole, one end of the valve core sleeve 40 is inserted into the nut inner hole, and the outer wall of the valve core sleeve 40 is in sliding guide cooperation with the inner wall of the nut inner hole. The outer wall of the valve core assembly 30 is provided with a guide surface 301 which is in sliding guide cooperation with the inner wall of the nut inner hole. In this way, during the movement of the valve core assembly 30 and the valve core sleeve 40, the nut sleeve 50 can guide the valve core assembly 30 and the valve core sleeve 40 respectively, thereby improving the coaxiality of the nut sleeve 50, the valve core sleeve 40 and the valve core assembly 30, and further reducing the probability of the valve core sleeve 40 and the valve core assembly 30 being deflected when the refrigerant impacts the valve core sleeve 40, thereby effectively improving the stability of the overall structure.

[0051] Specifically, the nut inner hole has a first inner hole 501 and a second inner hole 502 which are through the electronic expansion valve 100 in the axial direction, and the first inner hole 501 is arranged at one end of the second inner hole 502 away from the valve port 203. One end of the valve core sleeve 40 is inserted into the second inner hole 502, and the outer wall of the valve core sleeve 40 is in sliding guide cooperation with the inner wall of the second inner hole 502, and the guide surface 301 on the valve core assembly 30 is in synchronous sliding guide cooperation with the inner wall of the first inner hole 501 and the inner wall of the second flow-through cavity 401.

[0052] Understandably, by setting the outer wall of the valve core sleeve 40 to slide against the inner wall of the second inner hole 502, and the guide surface 301 of the valve core assembly 30 to slide synchronously against the inner wall of the first inner hole 501 and the inner wall of the second flow cavity 401, the nut sleeve 50 can guide the valve core assembly 30 and the valve core sleeve 40 respectively during their movement, and the valve core sleeve 40 and the valve core assembly 30 can also achieve a guiding fit. This greatly improves the coaxiality among the nut sleeve 50, the valve core sleeve 40, and the valve core assembly 30, thereby reducing the probability of misalignment of the valve core sleeve 40 and the valve core assembly 30 when refrigerant impacts the valve core sleeve 40, effectively improving the overall structural stability.

[0053] Optionally, the first inner hole 501 and the second inner hole 502 are coaxially arranged, which is simple in structure, easy to process, and can improve the coaxiality of the movement of the valve core sleeve 40 and the valve core assembly 30.

[0054] like Figure 2 and Figure 4 As shown, in one embodiment, the valve core assembly 30 includes a screw 31, a valve needle 32, and a spring sleeve 33. One end of the spring sleeve 33 is connected to the screw 31, and the other end is connected to the valve needle 32. The screw 31 passes through and is threadedly connected to the nut sleeve 50, converting the circumferential rotation of the screw 31 into axial movement of the valve core assembly 30. The valve needle 32 cooperates with the valve port 203 to achieve throttling. Here, the guide surface 301 can be formed by the outer wall of the spring sleeve 33.

[0055] Furthermore, in one embodiment, the outer wall of the nut sleeve 50 is press-fitted or transition-fitted with the inner wall of the main valve cavity 101. By press-fitting the nut sleeve 50 to the main valve seat 10 with an interference fit or transition fit, the connection strength of the nut sleeve 50 can be guaranteed, and the coaxiality of the nut sleeve 50 can be improved.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, include: The main valve seat (10) has a main valve chamber (101) inside it; A valve seat core (20) is disposed inside the main valve seat (10), and a flow gap (102) is formed between the outer wall of the valve seat core (20) and the inner wall of the main valve seat (10). The valve seat core (20) has a first flow cavity (201) and a first hole unit (202) communicating with the first flow cavity (201). The first hole unit (202) is communicating with the flow gap (102). Valve core sleeve (40) is movably installed in the main valve chamber (101). The valve core sleeve (40) can move axially toward or away from the valve seat core (20) to open or block the flow gap (102).

2. The electronic expansion valve according to claim 1, characterized in that, The total flow area of ​​the first hole unit (202) is greater than or equal to the flow area of ​​the first flow cavity (201).

3. The electronic expansion valve according to claim 2, characterized in that, The flow area of ​​the flow gap (102) is greater than or equal to the total flow area of ​​the first hole unit (202).

4. The electronic expansion valve according to claim 1, characterized in that, The first hole unit (202) includes a plurality of first flow holes (2021), which are spaced apart on the sidewall of the valve seat core (20).

5. The electronic expansion valve according to claim 1, characterized in that, The valve core sleeve (40) includes a cylinder (41) and a seal (42). The seal (42) is installed at one end of the cylinder (41). When the valve core sleeve (40) blocks the flow gap (102), the seal (42) abuts against the opening of the flow gap (102).

6. The electronic expansion valve according to claim 5, characterized in that, The cylinder (41) has an installation groove (403) at one end. The sealing element (42) includes a main body (421), which is installed in the installation groove (403). The outer side wall of the main body (421) is press-fitted or transition-fitted with the inner side wall of the installation groove (403).

7. The electronic expansion valve according to claim 6, characterized in that, The seal (42) further includes an abutment portion (422), one end of which is connected to the main body portion (421), and the other end extends at least partially out of the mounting groove (403).

8. The electronic expansion valve according to claim 1, characterized in that, The main valve seat (10) is also provided with a mounting hole (103), which is located at one end of the main valve cavity (101) and communicates with the main valve cavity (101); One end of the valve seat core (20) protrudes to form a boss (21), which is inserted into the mounting hole (103).

9. The electronic expansion valve according to claim 1, characterized in that, The valve seat core (20) is also provided with a valve port (203), which is connected to the first flow cavity (201); The valve core sleeve (40) has a second flow chamber (401), and the electronic expansion valve further includes a valve core assembly (30), which is movably installed in the main valve chamber (101), and at least a portion of the valve core assembly (30) is inserted into the second flow chamber (401) and is axially movable toward or away from the valve port (203) to regulate the flow rate at the valve port (203); The valve core sleeve (40) has a second hole unit (402) on its side wall, which connects the second flow chamber (401) and the main valve chamber (101).

10. The electronic expansion valve according to claim 9, characterized in that, The electronic expansion valve also includes a nut sleeve (50), which is installed in the main valve chamber (101) and fixedly connected to the main valve seat (10). The nut sleeve (50) has an inner nut hole. One end of the valve core sleeve (40) is inserted into the inner hole of the nut, and the outer wall of the valve core sleeve (40) slides and guides the inner wall of the inner hole of the nut. The outer wall of the valve core assembly (30) is provided with a guide surface (301), and the guide surface (301) slides and guides the inner wall of the inner hole of the nut.

11. The electronic expansion valve according to claim 10, characterized in that, The nut has a first inner hole (501) and a second inner hole (502) that extend along the axial direction of the electronic expansion valve. The first inner hole (501) is located at the end of the second inner hole (502) away from the valve port (203). One end of the valve core sleeve (40) is inserted into the second inner hole (502), and the outer wall of the valve core sleeve (40) slides and guides the inner wall of the second inner hole (502). Furthermore, the guide surface (301) on the valve core assembly (30) slides and guides the inner wall of the first inner hole (501) and the inner wall of the second flow cavity (401) in a synchronous manner.

12. The electronic expansion valve according to claim 10, characterized in that, The outer wall of the nut sleeve (50) is interference-fitted or transition-fitted with the inner wall of the main valve cavity (101).

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