Electronic expansion valve

Abstract

The embodiment of the utility model provides an electronic expansion valve, and relates to the technical field of electronic control valves. The electronic expansion valve comprises a valve seat, the top of the valve seat is concavely provided with an assembly cavity, the bottom of the valve seat is provided with a first opening communicated with the assembly cavity, and the side wall of the valve seat is provided with a second opening communicated with the assembly cavity; the valve needle assembly is assembled in the assembling cavity; the supporting seat is assembled on the side, corresponding to the assembling cavity, of the valve seat; a through hole is formed in the supporting seat; a bearing mounting groove is formed in the end, away from the valve seat, of the supporting seat and located on the outer periphery of the through hole. The bearing is mounted in the bearing mounting groove; the blocking piece is installed in the bearing installation groove and abuts against the side, away from the bottom wall of the installation groove, of the bearing; the rotor assembly is provided with a rotating shaft, and the rotating shaft is installed on the bearing, extends to the through hole and is in transmission connection with the valve needle assembly; and the shell covers the outer side of the rotor assembly and is connected with the valve seat. The installation of the rotor assembly can be better realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric valve technical field, specifically, electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve is a kind of throttling element that can regulate the refrigerant flow into heat exchange device according to preset program.

[0003] Direct-drive electronic expansion valve is a type of electronic expansion valve, mainly including rotor, coil, valve needle and valve body. The valve needle is movably installed in the valve body, and the rotor is rotatably installed in the valve body and is in driving connection with the valve needle, so as to drive the valve needle to move by the rotation of the rotor to realize opening degree adjustment.

[0004] In the prior art, the bearing is fixed to the top end of the rotor, which causes the middle part of the rotating shaft of the rotor to lack support and easily produce radial swing, affecting the transmission accuracy of the valve needle assembly. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an electronic expansion valve, which can realize stable support of the rotor and facilitate assembly of the electronic expansion valve.

[0006] The embodiment of the utility model can be realized as follows:

[0007] In a first aspect, the utility model provides an electronic expansion valve, comprising:

[0008] A valve seat, a top part of which is concavely provided with an assembly cavity, and a bottom part of which is provided with a first opening in communication with the assembly cavity, and a side wall of the valve seat is provided with a second opening in communication with the assembly cavity;

[0009] A valve needle assembly, which is assembled in the assembly cavity;

[0010] A support seat, which is assembled on one side of the valve seat corresponding to the assembly cavity; the support seat is provided with a through hole; an end of the support seat away from the valve seat is provided with a bearing mounting groove at the outer periphery of the through hole;

[0011] A bearing, which is mounted in the bearing mounting groove;

[0012] A blocking piece, which is mounted in the bearing mounting groove and abuts against one side of the bearing away from the bottom wall of the bearing mounting groove;

[0013] A rotor assembly, which has a rotating shaft, the rotating shaft is mounted in the bearing and extends to the through hole and is in driving connection with the valve needle assembly, and the rotor assembly can drive the valve needle assembly to move by rotation;

[0014] A housing is provided outside the rotor assembly and connected to the valve seat.

[0015] In an optional embodiment, the bearing mounting groove comprises a first ring groove and a second ring groove;

[0016] The first ring groove is provided at the outer periphery of the support base at the through hole and corresponds to the bearing outer ring;

[0017] The second ring groove is provided outside the first ring groove and communicates with the first ring groove;

[0018] The bearing is mounted in the first ring groove, and the blocking piece is mounted in the second ring groove.

[0019] In an optional embodiment, the blocking piece comprises a blocking ring base;

[0020] The inner diameter of the blocking ring base is greater than the diameter of the bearing inner ring and smaller than the diameter of the bearing outer ring;

[0021] The second ring groove penetrates the support base at one end of the first ring groove;

[0022] The blocking ring base is mounted in the second ring groove and abuts against the bearing.

[0023] In an optional embodiment, the blocking piece further comprises an assembly ring base, which is provided at one side of the blocking ring base, the inner diameter of the assembly ring base corresponds to the outer ring of the bearing, and the outer diameter of the assembly ring base corresponds to the diameter of the second ring groove;

[0024] The assembly ring base is assembled in the second ring groove, and the inner side wall of the assembly ring base cooperates with the outer side wall of the bearing and the side wall of the second ring groove.

[0025] In an optional embodiment, the assembly ring base is connected to the support base by welding or interference fit.

[0026] In an optional embodiment, the second ring groove is provided at the side wall of the first ring groove;

[0027] The blocking piece is a retainer, which is mounted in the second ring groove and abuts against the bearing.

[0028] In an optional embodiment, the electronic expansion valve further comprises an inner retainer;

[0029] The inner retainer is provided at the rotating shaft, abuts against the bearing inner ring, and is connected to the rotating shaft.

[0030] In an optional embodiment, the rotating shaft is provided with a limiting platform, one end of the inner ring of the bearing abuts against the limiting platform, and the other end of the inner ring abuts against the inner retainer ring.

[0031] In an optional embodiment, the valve seat corresponds to one end of the assembly cavity, and a plug-in ring groove is arranged at the outer periphery of the assembly cavity, and the bottom end of the support seat is plug-in assembled in the plug-in ring groove.

[0032] The valve seat corresponds to one end of the assembly cavity, and a matching ring groove is arranged at the outer periphery of the valve seat, and the shell is plug-in assembled in the matching ring groove.

[0033] In an optional embodiment, the electronic expansion valve further comprises a driving nut block, and the driving nut block has a threaded hole.

[0034] The support seat is provided with a sliding groove in communication with the through hole on the side away from the bearing mounting groove.

[0035] The driving nut block is mounted in the sliding groove, the rotating shaft is provided with threads, the rotating shaft is mounted in the threaded hole through threads, and rotation of the rotating shaft can drive the nut block to move along the sliding groove.

[0036] The valve needle assembly is connected with the nut block.

[0037] The electronic expansion valve provided by the embodiment of the utility model has the beneficial effects that:

[0038] The support seat is assembled on one side of the assembly cavity corresponding to the valve seat, and a through hole is arranged on the support seat. A bearing mounting groove is arranged on the end of the support seat away from the valve seat and at the outer periphery of the through hole. The bearing is mounted in the bearing mounting groove, and a blocking piece is arranged to abut against and fix the bearing. The rotating shaft of the rotor assembly is mounted in the bearing and extends to the through hole to be in transmission connection with the valve needle assembly. Overall, the support seat is arranged to realize the connection between the rotor and the valve seat, the bearing is arranged in the middle of the rotating shaft, and therefore the stability of the rotor assembly can be improved, the rotor assembly can be provided with stable support, and the problem that radial shaking is prone to occur and the transmission accuracy of the valve needle assembly is affected can be solved. In addition, the blocking piece can better fix the bearing in the bearing mounting groove, the problem of bearing shifting can be avoided, and assembly can be more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope. For ordinary skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.

[0040] Figure 1 A cross-sectional structure schematic diagram of the electronic expansion valve provided for the embodiment is shown in the figure;

[0041] Figure 2 A partial cross-sectional structure schematic diagram of the electronic expansion valve provided for the embodiment is shown in the figure;

[0042] Figure 3 A partial cross-sectional explosion structure schematic diagram of the electronic expansion valve provided for the embodiment is shown in the figure.

[0043] Icon: 100-electronic expansion valve; 110-valve seat; 111-assembly cavity; 112-first opening; 113-second opening; 114-plug ring groove; 115-mating ring groove; 120-support seat; 121-through hole; 122-bearing mounting groove; 123-first ring groove; 124-second ring groove; 125-slotted hole; 130-bearing; 140-stop; 141-stop ring table; 142-assembly ring table; 150-rotor assembly; 151-outer shell; 152-rotor shaft; 153-limiting table; 160-inner retainer; 170-driving nut block; 171-threaded hole; 180-mounting seat; 181-rotor shaft hole. DETAILED DESCRIPTION

[0044] In the prior art, the bearing is fixed to the top end of the rotor, which causes the middle part of the rotor shaft to lack support and easily produce radial wobble, affecting the transmission accuracy of the valve needle assembly. In view of the above problems, the utility model provides an electronic expansion valve which can realize stable support of the rotor and facilitate overall assembly of the electronic expansion valve, thereby improving the above problems.

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0047] It should be noted that similar reference numerals and letters refer to similar items in the various figures, and once an item is defined in one figure, it should not require further defining and explaining in subsequent figures.

[0048] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0049] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0051] The overall structure, working principle and technical effects of the electronic expansion valve provided by the utility model will be described in detail below by combining the drawings.

[0052] Please refer to Figure 1 The embodiment provides an electronic expansion valve 100, which can be applied to a heat exchange system to realize adjustment of refrigerant flow.

[0053] Please refer to Figures 1 to 3In the embodiment, the electronic expansion valve 100 comprises a valve seat 110, a valve needle assembly, a support seat 120, a bearing 130, a blocking piece 140, a rotor assembly 150 and a shell 151. The top of the valve seat 110 is concave with an assembly cavity 111, and the bottom is provided with a first opening 112 communicating with the assembly cavity 111. The side wall of the valve seat 110 is provided with a second opening 113 communicating with the assembly cavity 111. One of the first opening 112 and the second opening 113 is used for the inflow of refrigerant, and the other is used for the outflow of refrigerant. The valve needle assembly is assembled in the assembly cavity 111 and is provided corresponding to the first opening 112. The valve needle assembly can move relative to the assembly cavity 111 to adjust the opening degree, thereby changing the flow of refrigerant. The support seat 120 is assembled on one side of the valve seat 110 corresponding to the assembly cavity 111. The support seat 120 is provided with a through hole 121. The end of the support seat 120 away from the valve seat 110 is provided with a bearing mounting groove 122 at the outer periphery of the through hole 121. The bearing 130 is installed in the bearing mounting groove 122. The blocking piece 140 is installed in the bearing mounting groove 122 and abuts against one side of the bearing 130 away from the bottom wall of the bearing mounting groove 122. The rotor assembly 150 has a rotating shaft 152, which is installed in the bearing 130 and extends to the through hole 121 and is in transmission connection with the valve needle assembly. The rotation of the rotor assembly 150 can drive the valve needle assembly to move. The shell 151 covers the outside of the rotor assembly 150 and is connected with the valve seat 110.

[0054] In the embodiment, the support seat 120 is assembled on one side of the valve seat 110 corresponding to the assembly cavity 111, and the through hole 121 is arranged on the support seat 120. The bearing mounting groove 122 is arranged at the outer periphery of the through hole 121 at the end of the support seat 120 away from the valve seat 110. The bearing 130 is installed in the bearing mounting groove 122, and the blocking piece 140 is arranged to abut against and fix the bearing 130. The rotating shaft 152 of the rotor assembly 150 is installed in the bearing 130 and extends to the through hole 121 to be in transmission connection with the valve needle assembly. Overall, the connection between the rotor and the valve seat 110 can be achieved by arranging the support seat 120, so that the bearing 130 is located in the middle of the rotating shaft 152, thereby improving the stability of the assembly of the rotor assembly 150 to provide stable support for the rotor assembly 150, thereby improving the problem that the radial swing easily affects the transmission accuracy of the valve needle assembly. Secondly, the blocking piece 140 can better fix the bearing 130 in the bearing mounting groove 122, avoid the problem of bearing 130 shifting, and also make the assembly more convenient.

[0055] From the overall assembly, the support seat 120 is arranged in a split type, so that the installation of the bearing 130 and the cooperation of the bearing mounting groove 122 and the blocking piece 140 can independently complete the fixation of the bearing 130 before the overall assembly, thereby reducing the overall assembly steps.

[0056] Please refer toFigures 1 to 3 Further, the bearing mounting groove 122 comprises a first ring groove 123 and a second ring groove 124. The first ring groove 123 is arranged on the outer periphery of the support base 120 at the through hole 121, and corresponds to the outer ring of the bearing 130. The second ring groove 124 is arranged outside the first ring groove 123, and is in communication with the first ring groove 123. The bearing 130 is mounted in the first ring groove 123, and the blocking piece 140 is mounted in the second ring groove 124.

[0057] In this embodiment, the bearing mounting groove 122 is arranged as the first ring groove 123 and the second ring groove 124. The first ring groove 123 can facilitate the positioning and assembly of the bearing 130, and can fix the outer ring of the bearing 130 and limit the bottom. The second ring groove 124 is arranged, so that the assembly and positioning of the blocking piece 140 are facilitated, the blocking piece 140 can limit the top surface of the bearing 130, and the movement of the bearing 130 is avoided.

[0058] Further, the blocking piece 140 comprises a blocking ring platform 141. The inner diameter of the blocking ring platform 141 is greater than the diameter of the inner ring of the bearing 130, and is less than the diameter of the outer ring of the bearing 130. The second ring groove 124 penetrates the support base 120, and the blocking ring platform 141 at one end of the first ring groove 123 is mounted in the second ring groove 124, and abuts against the bearing 130.

[0059] In this embodiment, the inner diameter of the blocking ring platform 141 is greater than the diameter of the inner ring of the bearing 130, and is less than the diameter of the outer ring of the bearing 130. In this way, the blocking piece 140 abuts against the outer ring of the bearing 130, so that the outer ring of the bearing 130 is fixed, and the rotation of the inner ring of the bearing 130 is not affected. The second ring groove 124 penetrates the end of the support base 120, so that the blocking piece 140 is mounted in the second ring groove 124 from the end of the support base 120, and abuts against the outer ring of the bearing 130, and is more convenient to install.

[0060] Please refer to Figures 1 to 3 Further, the blocking piece 140 further comprises an assembly ring platform 142. The assembly ring platform 142 is arranged on one side of the blocking ring platform 141, the inner diameter of the assembly ring platform 142 corresponds to the outer ring of the bearing 130, and the outer diameter of the assembly ring platform 142 corresponds to the diameter of the second ring groove 124. The assembly ring platform 142 is assembled in the second ring groove 124, the inner side wall of the assembly ring platform 142 is matched with the outer side wall of the bearing 130, and the inner side wall of the assembly ring platform 142 is matched with the side wall of the second ring groove 124.

[0061] In this embodiment, the assembly ring platform 142 is arranged on one side of the blocking ring platform 141, so that the assembly is facilitated.

[0062] In this embodiment, the assembly ring platform 142 is connected to the support base 120 by welding or interference fit.

[0063] The connecting between the assembly ring 142 and the support base 120 is achieved by interference fit or welding, so that the fixing of the blocking piece 140 can be better achieved.

[0064] It should be noted that in the embodiment, the blocking ring 141 and the assembly ring 142 are integrally formed.

[0065] Of course, in some other embodiments of the present application, the second ring groove 124 is arranged on the side wall of the first ring groove 123. The blocking piece 140 is a retainer ring, which is installed in the second ring groove 124 and abuts against the bearing 130. That is, the blocking piece 140 is arranged as a hole retainer ring, and only the second ring groove 124 needs to be arranged on the side wall of the first ring groove 123 at the end surface of the bearing 130 to achieve the fixing of the inner ring of the bearing 130.

[0066] Please refer to Figures 1 to 3 In the embodiment, the electronic expansion valve 100 further comprises an inner retainer ring 160. The inner retainer ring 160 is arranged on the rotating shaft 152, abuts against the inner ring of the bearing 130, and is connected with the rotating shaft 152.

[0067] In the embodiment, the inner retainer ring 160 is arranged on the rotating shaft 152, so that the inner ring of the bearing 130 can be limited.

[0068] In the embodiment, the rotating shaft 152 is provided with a limiting table 153, one end of the inner ring of the bearing 130 abuts against the limiting table 153, and the other end of the inner ring of the bearing 130 abuts against the inner retainer ring 160.

[0069] In the embodiment, the inner limiting table 153 is integrally formed on the rotating shaft 152, so that the fixing of the inner ring of the bearing 130 can be achieved by the limiting table 153 and the inner retainer ring 160.

[0070] Of course, in some other embodiments of the present application, one or both of the inner retainer ring 160 and the limiting table 153 can be a shaft retainer ring. A clamping groove is arranged on the rotating shaft 152 corresponding to the end of the inner ring of the bearing 130, and the shaft retainer ring is clamped in the clamping groove to achieve the fixing of the inner ring of the bearing 130.

[0071] Please refer to Figures 1 to 3 In the embodiment, the valve seat 110 is provided with a plug-in assembly cavity 111 at one end corresponding to the recess, and a plug-in ring groove 114 is arranged at the outer periphery of the assembly cavity 111, and the bottom end of the support base 120 is plugged and assembled in the plug-in ring groove 114. The support base 120 and the valve seat 110 can be fixed by interference fit and press-fitted in the plug-in ring groove 114, and of course, after being plugged into the plug-in ring groove 114, the fixing connection can also be achieved by welding.

[0072] In the embodiment, the support base 120 has a cylindrical shape, which is convenient for processing.

[0073] Further, the electronic expansion valve 100 further comprises a driving nut block 170 having a threaded hole 171. The support base 120, away from the bearing mounting groove 122, is provided with a sliding groove 125 communicating with the through hole 121. The driving nut block 170 is mounted in the sliding groove 125. The sliding groove 125 can limit the rotation of the driving nut block 170. The rotating shaft 152 is provided with threads, and the rotating shaft 152 is mounted in the threaded hole 171 through the threads. The rotation of the rotating shaft 152 can drive the nut block to move along the sliding groove 125. The valve needle assembly is connected with the nut block.

[0074] Please refer to Figures 1 to 3 Further, the valve seat 110, corresponding to one end of the assembly cavity 111, is provided with a matching ring groove 115 at the outer periphery of the valve seat 110. The shell 151 is inserted into the matching ring groove 115 and is welded with the valve seat 110.

[0075] Further, the shell 151 is provided with a mounting seat 180. The mounting seat 180 is provided with a rotating shaft hole 181. The top end of the rotating shaft 152 of the rotor is inserted into the rotating shaft hole 181, thereby achieving the fixation of the rotor at multiple positions.

[0076] In summary, the electronic expansion valve 100 provided by the embodiment is characterized in that the support base 120 is assembled on the side of the valve seat 110 corresponding to the assembly cavity 111, and the support base 120 is provided with a through hole 121. The bearing mounting groove 122 is arranged at the outer periphery of the through hole 121, away from the valve seat 110. The bearing 130 is mounted in the bearing mounting groove 122, and the blocking piece 140 is arranged to abut against the bearing 130 to fix the bearing 130. The rotating shaft 152 of the rotor assembly 150 is mounted in the bearing 130 and extends into the through hole 121 to be drivingly connected with the valve needle assembly. Overall, the connection between the rotor assembly 150 and the valve seat 110 is achieved by arranging the support base 120. The bearing 130 is located at the middle part of the rotating shaft 152, thereby improving the stability of the assembly of the rotor assembly 150 and providing stable support for the rotor assembly 150, so as to improve the problem of radial shaking that affects the transmission accuracy of the valve needle assembly. In addition, the blocking piece 140 can better fix the bearing 130 in the bearing mounting groove 122, avoiding the problem of bearing 130 shifting, and making the assembly more convenient.

[0077] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

Claims

1. An electronic expansion valve characterized by, The valve seat (110) is provided with a fitting cavity (111) at the top and a first opening (112) at the bottom, and the side wall of the valve seat (110) is provided with a second opening (113) communicating with the fitting cavity (111); a valve needle assembly is fitted in the fitting cavity (111); a support seat (120) is fitted on one side of the valve seat (110) corresponding to the fitting cavity (111); the support seat (120) is provided with a through hole (121); the end of the support seat (120) away from the valve seat (110) is provided with a bearing mounting groove (122) at the outer periphery of the through hole (121); a bearing (130) is mounted in the bearing mounting groove (122); a blocking piece (140) is mounted in the bearing mounting groove (122) and abuts against one side of the bearing (130) away from the bottom wall of the bearing mounting groove (122); a rotor assembly (150) has a rotating shaft (152) mounted in the bearing (130) and extending to the through hole (121) and in transmission connection with the valve needle assembly, and the rotor assembly (150) can drive the valve needle assembly to move; an outer shell (151) covers the outside of the rotor assembly (150) and is connected with the valve seat (110). The bearing mounting groove (122) comprises a first ring groove (123) and a second ring groove (124); The first ring groove (123) is arranged at the outer periphery of the support seat (120) corresponding to the outer ring of the bearing (130); The second ring groove (124) is arranged outside the first ring groove (123) and communicates with the first ring groove (123); The bearing (130) is mounted in the first ring groove (123), and the blocking piece (140) is mounted in the second ring groove (124). The blocking piece (140) comprises a blocking ring platform (141); The inner diameter of the blocking ring platform (141) is greater than the diameter of the inner ring of the bearing (130) and smaller than the diameter of the outer ring of the bearing (130); The second ring groove (124) penetrates one end of the support seat (120) where the first ring groove (123) is arranged; 2. The electronic expansion valve according to claim 1, characterized in that The blocking ring platform (141) is mounted in the second ring groove (124) and abuts against the bearing (130). The blocking piece (140) further comprises a fitting ring platform (142) arranged on one side of the blocking ring platform (141), and the inner diameter of the fitting ring platform (142) corresponds to the outer ring of the bearing (130), and the outer diameter of the fitting ring platform (142) corresponds to the diameter of the second ring groove (124); ​ ​ 3. The electronic expansion valve according to claim 2, wherein ​ ​ ​ ​ 4. The electronic expansion valve according to claim 3, wherein ​ The assembly ring table (142) is assembled in the second ring groove (124), and the inner side wall of the assembly ring table (142) is matched with the outer side wall of the bearing (130), and the inner side wall of the assembly ring table (142) is matched with the side wall of the second ring groove (124).

5. The electronic expansion valve according to claim 4, wherein The assembly ring table (142) is connected with the support seat (120) by welding or interference fit.

6. The electronic expansion valve according to claim 2, wherein The second ring groove (124) is arranged on the side wall of the first ring groove (123); The blocking piece (140) is a check ring, which is installed in the second ring groove (124) and abuts against the bearing (130).

7. The electronic expansion valve according to any one of claims 1 to 6, characterized in that The electronic expansion valve further comprises an inner check ring (160); The inner check ring (160) is arranged on the rotating shaft (152) and abuts against the inner ring of the bearing (130) and is connected with the rotating shaft (152).

8. The electronic expansion valve according to claim 7, characterized in that The rotating shaft (152) is provided with a limiting table (153), one end of the inner ring of the bearing (130) abuts against the limiting table (153), and the other end of the inner ring of the bearing (130) abuts against the inner check ring (160).

9. The electronic expansion valve according to any one of claims 1 to 6, characterized in that One end of the valve seat (110) corresponding to the assembly cavity (111) is recessed, and a plug-in ring groove (114) is arranged on the outer periphery of the assembly cavity (111), and the bottom end of the support seat (120) is plug-in assembled in the plug-in ring groove (114); One end of the valve seat (110) corresponding to the assembly cavity (111) is recessed, and a plug-in ring groove (114) is arranged on the outer periphery of the assembly cavity (111), and the bottom end of the support seat (120) is plug-in assembled in the plug-in ring groove (114); 10. The electronic expansion valve according to any one of claims 1 to 6, characterized in that The electronic expansion valve further comprises a driving nut block (170), and the driving nut block (170) has a threaded hole (171); The support seat (120) is provided with a sliding groove (125) communicated with the through hole (121) on the side away from the bearing mounting groove (122); The driving nut block (170) is installed in the sliding groove (125), the rotating shaft (152) is provided with threads, the rotating shaft (152) is installed in the threaded hole (171) through threads, and rotation of the rotating shaft (152) can drive the nut block to move along the sliding groove (125); The valve needle assembly is connected with the nut block.

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