JP2022515316A - Electronic expansion valve - Google Patents

Abstract

A valve body (10), a rotor (20) rotatably provided in the valve body (10), a fixed seat (30) fixed in the valve body (10), and a rotor ( A bearing (40) provided between the fixed seat (30) and one of the inner ring and the outer ring connected to the rotor (20) and the other connected to the fixed seat (30). Including electronic expansion valve.

Description

The present invention relates to the technical field of an electronic expansion valve, and specifically to an electronic expansion valve.

Currently, an electronic expansion valve usually consists of members such as a rotor, a screw, a fixed seat and a spindle assembly, the screw is connected to the rotor and the spindle assembly is usually connected to the screw. The electronic expansion valve achieves the purpose of opening and closing the valve opening by moving the rotor to move the screw in the axial direction and further moving the spindle assembly in the axial direction. However, by adopting the above structure, the electronic expansion valve has a problem that the structure is complicated and noise is large.

The present invention provides an electronic expansion valve for solving the problem of complicated structure and large noise in the conventional technique.

The present invention is provided between a valve body, a rotor rotatably provided in the valve body, a fixed seat fixed in the valve body, and between the rotor and the fixed seat, and is one of an inner ring and an outer ring. Provides an electronic expansion valve including a bearing connected to a rotor and the other connected to a fixed seat.

Further, the electronic expansion valve further includes a screw provided in the valve body, one end of which is inserted into a fixed seat and a bearing in order and screwed into a rotor, and the rotor drives the screw in the axial direction. Used to move along.

Further, the rotor includes a magnetic material provided on the outside of the screw and a connecting plate provided on the magnetic material into which the screw is inserted and screwed, and the connecting plate and the fixed seat are bearings, respectively. Located on both sides, one of the inner and outer rings of the bearing is connected to the connecting plate and the other to the fixed seat.

Further, the screw and the fixed seat are fitted in a gap.

Further, the electronic expansion valve further includes a first limiting structure provided between the screw and the fixed seat and used to limit the displacement and rotation of the screw with respect to the fixed seat.

Further, the first limiting structure is fixed to the screw, has an extension end, and is provided on the side wall of the fixed seat with a stop piece having an angle between the extension direction of the extension end and the axial direction of the screw, and is provided in the extension direction. Includes a guide limiting groove that is the same as the axial direction of the screw, the extension end of the stop is located within the guide limiting groove, and the guide limiting groove is engaged with the stop to displace the screw with respect to the fixed seat. And limit rotation.

Further, the first limiting structure includes a first boss provided on the side wall of the screw and a second boss provided on the inner wall of the fixed seat, the first boss being engaged with the second boss. This limits the displacement of the screw with respect to the fixed seat.

Further, the valve body includes a sleeve and a valve seat, and a rotor, a fixed seat, a bearing and a screw are all provided between the sleeve and the valve seat.

Further, the valve seat has a valve chamber and a mounting hole communicating with the valve chamber, and the electronic expansion valve is provided so as to be movable in the mounting hole, is connected to the screw, and closes the valve opening. Further includes a spindle assembly having a position and a second position to open the valve opening.

Further, the valve body further includes a socket provided on the outside of the spindle assembly and fixed in the mounting hole, one end away from the bearing of the fixed seat being connected to the end of the socket.

Further, the spindle assembly is provided in a valve socket movably provided in the mounting hole to which one end of the screw is connected, a spindle in which one end is movably provided in the valve socket, and in the valve socket. It also includes a pretension spring located between the valve socket and the spindle and used to provide pretension to the spindle.

Further, the spindle assembly further comprises a second limiting structure provided between the spindle and the screw and used to limit the relative displacement of the spindle and the screw.

Further, a first limiting hole is provided at one end of the spindle located in the valve socket, a second limiting structure is provided in the valve socket, and a part thereof is provided in the first limiting hole. One end of a pretension spring, including a sphere and a gasket provided between the sphere and the screw, provided with a second limiting hole, and a portion of the sphere being provided in the second limiting hole. Is connected to the valve socket and the other end of the pretension spring is connected to the gasket.

Further, on the side of the connecting plate facing the bearing, an annular flange covering the outside of the bearing is provided.

Further, the fixed seat has a through hole having a non-circular cross section, the screw has a screw portion and a limiting portion, and the screw portion of the screw is screwed into the rotor to penetrate the cross section of the limiting portion. By aligning the cross sections of the holes with each other, the rotation of the screw with respect to the fixed seat is restricted.

Applying the technical aspects of the present invention, the electronic expansion valve includes a valve body, a rotor, a fixed seat and a bearing. By rotatably providing the rotor inside the valve body, the fixed seat is fixed inside the valve body, and one of the inner ring and the outer ring of the bearing is connected to the rotor and the other is connected to the fixed seat. The rotor can be supported by fixed seats and bearings, its structure is relatively simple compared to conventional equipment, the equipment can be simplified and at the same time the rotor can be operated stably, and the bearings are of the equipment. The operating friction can be reduced, and the noise generated when the device is operated can be reduced.

The drawings of the specification which form part of the present application are for the purpose of providing a further understanding of the present invention, and the schematic examples of the present invention and their description thereof are for the purpose of interpreting the present invention. However, the present invention is not inappropriately limited.

The schematic structural diagram of the electronic expansion valve provided in Example 1 of this invention is shown. The sectional view of the fixed seat in FIG. 1 is shown. The schematic structural diagram of the fixed seat in FIG. 1 is shown. The schematic structural diagram of the stopper piece in FIG. 1 is shown. A sectional view taken along the line AA in FIG. 4 is shown. The schematic structural drawing of the electronic expansion valve provided in Example 2 of this invention is shown. The schematic structural diagram of the electronic expansion valve provided in Example 3 of this invention is shown. The schematic structural diagram of the electronic expansion valve provided in Example 4 of this invention is shown. The schematic structural diagram of the fixed seat in FIG. 8 is shown. The schematic structural diagram of the electronic expansion valve provided in Example 5 of this invention is shown.

Here, the above drawing includes the following reference numerals.
10 Valve body, 11 sleeve, 12 valve seat, 12a valve chamber, 13 socket, 20 rotor, 21 magnetic material, 22 connection plate, 30 fixed seat, 40 bearing, 50 screw, 61 stop piece, 62 guide limiting groove, 63 1st boss, 64 2nd boss, 70 spindle assembly, 71 valve socket, 72 spindle, 73 pretension spring, 74 sphere, 75 gasket.

Hereinafter, the technical embodiments in the examples of the present invention will be clearly and completely described with reference to the drawings in the examples of the present invention, but the described examples are merely examples of a part of the present invention, and all of them are described. It is clear that this is not an example of. The description for at least one exemplary embodiment below is merely exemplary in practice and is not intended to limit the invention and its application or use. Based on the examples in the present invention, all other examples obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

As shown in FIGS. 1 to 5, Embodiment 1 of the present invention provides an electronic expansion valve including a valve body 10, a rotor 20, a fixed seat 30, and a bearing 40. Here, the rotor 20 is rotatably provided in the valve body 10, the fixed seat 30 is fixed in the valve body 10, the bearing 40 is provided between the rotor 20 and the fixed seat 30, and the bearing. One of the inner ring and the outer ring of 40 is connected to the rotor 20, and the other is connected to the fixed seat 30. Specifically, the inner ring of the bearing 40 may be connected to the rotor 20 and the outer ring of the bearing 40 may be correspondingly connected to the fixed seat 30, or the inner ring of the bearing 40 may be connected to the fixed seat 30. The outer ring of the bearing 40 may be connected to the rotor 20.

In this embodiment, the electronic expansion valve includes a valve body 10, a rotor 20, a fixed seat 30, and a bearing 40. Here, the rotor 20 is rotatably provided in the valve body 10, the fixed seat 30 is fixed in the valve body 10, one of the inner ring and the outer ring of the bearing 40 is connected to the rotor 20, and the other. Is connected to the fixed seat 30. With the above structure, the fixed seat 30 and the bearing 40 can support the rotor 20, simplifying the apparatus and at the same time ensuring stable rotation of the rotor 20. Further, by adding a bearing 40 between the fixed seat 30 and the rotor 20, stability in the rotation process of the rotor 20 can be ensured, thereby reducing noise generated when the device is operated.

Here, the electronic expansion valve further includes a screw 50, specifically, the screw 50 is provided in the valve body 10, one end of the screw 50 inserts a fixed seat 30 and a bearing 40 in order, and a rotor. Screwed into 20, the rotor 20 is used to drive the screw 50 to move along the axial direction.

Specifically, the rotor 20 includes a magnetic body 21 and a connecting plate 22. Here, the magnetic body 21 is provided on the outside of the screw 50, the connection plate 22 is provided on the magnetic body 21, the screw 50 is inserted into the connection plate 22, screwed into the connection plate 22, and is screwed to the connection plate 22. The fixed seat 30 is located on both sides of the bearing 40, and specifically, the outer ring of the bearing 40 in this example is connected to the connection plate 22, and the inner ring of the bearing 40 is connected to the fixed seat 30. Here, both the connecting plate 22 and the fixed seat 30 are connected to the bearing 40 by a welding method.

In this embodiment, by providing a coil outside the valve body 10 of the electronic expansion valve, a magnetic field generated after energizing the coil acts on the magnetic body 21 to rotate the rotor 20, and the rotor 20 rotates the rotor 20. The screw 50 is screwed into the rotor 20 to move the screw 50 in the axial direction, and the spindle assembly 70 achieves opening and closing of the valve opening by the action of the screw 50.

In this embodiment, the screw 50 and the fixed seat 30 are gap-fitted. By providing the above-mentioned gap, the fixed seat 30 avoids interference with the axial movement of the screw 50 and at the same time exerts a guiding action, and improves the stability of the screw 50 in the ascending or descending process.

Specifically, the electronic expansion valve further includes a first limiting structure, the first limiting structure being provided between the screw 50 and the fixed seat 30, and the first limiting structure being the fixed seat 30 of the screw 50. Used to limit displacement and rotation with respect to. By providing the first limiting structure, in the process of opening the valve opening of the electronic expansion valve, the screw 50 is brought into contact with the fixed seat 30 to exert the action of upper limiting.

Specifically, as shown in FIGS. 2 to 5, the first limiting structure includes a stop piece 61 and a guide limiting groove 62. Here, the stop piece 61 is fixed to the screw 50, and the stop piece 61 has an extension end, and the extension end and the screw 50 have an angle. The guide limiting groove 62 is provided on the side wall of the fixed seat 30, and the extension direction of the guide limiting groove 62 is the same as the axial direction of the screw 50. By engaging the limiting groove 62, the valve seat 12 and the stopper piece 61, the displacement and rotation of the screw 50 with respect to the fixed seat 30 are limited, and the stability of the device structure is improved. Here, the stop piece 61 may have one extension end, a plurality of extension ends, and one or more guide restrictions on the side wall of the fixed seat 30 corresponding to the stop piece 61. A groove 62 is provided. In this embodiment, the stop piece 61 is provided with two extension ends, and the side wall of the corresponding fixed seat 30 is provided with two guide limiting grooves 62.

In this embodiment, the valve body 10 includes a sleeve 11 and a valve seat 12, and a rotor 20, a fixed seat 30, a bearing 40, and a screw 50 are all provided between the sleeve 11 and the valve seat 12. The above arrangement improves the integrity of the device and facilitates the installation and removal of the device.

Specifically, the valve seat 12 has a valve chamber 12a and a mounting hole communicating with the valve chamber 12a, and in the present embodiment, the electronic expansion valve is provided so as to be movable in the mounting hole, and the screw 50 is provided. Further includes a spindle assembly 70 connected to and having a first position to close the valve opening and a second position to open the valve opening. The effect of opening and closing the valve opening is achieved by moving the screw axially by the rotation of the rotor and further moving the spindle assembly 70 axially between the first position and the second position. ..

Here, the spindle assembly 70 includes a valve socket 71, a spindle 72, and a pretension spring 73. The valve socket 71 is movably provided in the mounting hole, one end of the screw 50 is connected to the valve socket 71, one end of the spindle 72 is movably provided in the valve socket 71, and the pretension spring 73 is provided. Provided within the valve socket 71 and located between the valve socket 71 and the spindle 72, the pretension spring 73 is used to provide pretension to the spindle 72. By providing the pretension spring 73, preload in the valve socket 71 of the spindle 72 can be achieved, and at the same time, a cushioning effect on the spindle 72 is achieved, and a protective action on the spindle 72 is exerted.

As shown in FIG. 6, in the electronic expansion valve provided in the second embodiment of the present invention, the spindle assembly 70 is provided between the spindle 72 and the screw 50, and the relative displacement between the spindle 72 and the screw 50 is provided. It differs from Example 1 in that it further includes a second limiting structure used to limit. By providing the second limiting structure, it is possible to ensure that the spring pretension is provided between the spindle 72 and the valve opening at the time of passing, and the product performance can be ensured.

Here, a first limiting hole is provided at one end of the spindle 72 located in the valve socket 71. Specifically, the second limiting structure includes a sphere 74 and a gasket 75. Here, the sphere 74 is provided in the valve socket 71, a part of the sphere 74 is provided in the first limiting hole, the gasket 75 is provided between the sphere 74 and the screw 50, and the gasket 75. Is provided with a second limiting hole, a part of the sphere 74 is provided in the second limiting hole, and the sphere 74 is fixedly connected to one of the first limiting hole and the second limiting hole. In this example, the sphere 74 and the first limiting hole are connected by a welding method. One end of the pretension spring 73 is connected to the valve socket 71, and the other end of the pretension spring 73 is connected to the gasket 75. The first limiting hole, the second limiting hole, and the sphere 74 are engaged with each other, and the acting force of the pretension spring 73 achieves automatic calibration inside the valve socket 71 of the spindle 72. It is possible to avoid affecting the product performance due to the problem of coaxiality.

As shown in FIG. 7, in the electronic expansion valve provided in the third embodiment of the present invention, the valve body 10 includes a socket 13 provided on the outside of the spindle assembly 70 and fixed in the mounting hole, and is fixed. It differs from the first embodiment in that one end of the seat 30 away from the bearing 40 is connected to the end of the socket 13. In this embodiment, the socket 13 is also provided in a stepped structure, the socket 13 and the fixed seat 30 are connected, and the socket 13 is provided on the outside of the spindle assembly 70, so that the socket 13 is guided to the spindle 72. It can exert its action, thereby achieving axial movement of the spindle assembly 70 according to the screw 50 and further controlling the open state of the valve opening. Compared to the electronic expansion valve provided in the first embodiment, the electronic expansion valve provided in this embodiment has a separable valve seat, and one end near the flow path of the socket 13 extends into the valve chamber 12a. By inserting it, a complicated flow path structure can be achieved. By adopting the above structure, the noise of the fluid when the device is operated can be reduced, the socket 13 is used to guide the spindle 72, the coaxiality of the spindle 72 is improved, and the difficulty of processing is reduced. At the same time, the performance of the device can be ensured.

As shown in FIGS. 8 and 9, the electronic expansion valve provided in the fourth embodiment of the present invention is the same as the first embodiment in that the first limiting structure includes the first boss 63 and the second boss 64. different. Here, the first boss 63 is provided on the side wall of the screw 50, the second boss 64 is provided on the inner wall of the fixed seat 30, and the first boss 63 is engaged with the second boss 64. , The upward displacement of the screw 50 with respect to the fixed seat 30 is restricted, the spindle 72 is fixedly connected to the valve socket 71, and the first boss 63 is engaged with the valve socket 71, whereby the fixed seat of the screw 50 is fixed. The downward displacement with respect to 30 is limited. In this embodiment, the first boss 63 is formed by providing an annular protrusion on the side wall of the screw 50, and the through holes in the fixed seat 30 are provided in the first step hole and the second step hole that communicate with each other. A second boss 64 is formed by the step between the two step holes. Here, the first step hole has a larger diameter than the second step hole, the first step hole is located below the second step hole, and the first boss 63 is in the first step hole. Positioned, when the first boss 63 moves upward according to the screw 50 and contacts the second boss 64, the screw 50 stops moving upwards. The spindle 72 and the valve socket 71 are welded together, and the first boss 63 and the valve socket 71 are engaged with each other to limit the downward displacement of the screw 50 with respect to the fixed seat 30.

As shown in FIG. 9, the fixed seat 30 has a through hole having a non-circular cross section, the screw 50 has a screw portion and a limiting portion, and the screw portion of the screw 50 is screwed into the rotor 20. The cross section of the limiting portion and the cross section of the through hole are aligned with each other to limit the rotation of the screw 50 with respect to the fixed seat 30. Since the fixed seat 30 is fixed to the valve body 10, by adopting the above structure, it is possible to secure the occurrence of movement only in the axial direction without rotating the screw 50, and improve the reliability of the device. Here, the cross section of the through hole may be in the shape of an ellipse, a triangle, a rectangle, or the like, and the cross section of the restriction portion of the screw 50 and the cross section of the through hole are aligned with each other so that the fixed seat of the screw 50 is fixed. It suffices if the rotation with respect to 30 can be limited.

In another embodiment, by extending the screw 50, the same limiting effect as that of the first limiting structure in the second embodiment is obtained, and when the screw 50 opens the valve opening and continues to move upward, the screw is used. The 50 may come into contact with the inner wall of the sleeve 11 to stop the screw 50 from continuing to move upwards and exert an upper limiting effect. By designing the spindle 72 and the valve socket 71 in an integrated structure, the first boss 63 may be engaged with the valve socket 71 to exert a lower limiting action.

As shown in FIG. 10, the electronic expansion valve provided in the fifth embodiment of the present invention has a side toward the bearing 40 of the connection plate 22 and an outer side of the bearing 40 as compared with the electronic expansion valve provided in the first embodiment. An annular flange to be overlaid is provided. The bearing 40 may be fixed to the connecting plate 22 by a method of tightening or shrinking using the above structure, but such a connecting method is a method of connecting the bearing 40 to the connecting plate 22 by a welding process. In comparison, the machining process is simplified and more suitable for mass production of equipment.

It should be noted that the terms used herein are for illustration purposes only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise explicitly stated in the context, the singular form is also intended to include multiple forms, and the terms "include" and / or "include" are used herein. When used, it should also be understood to mean the presence of features, steps, operations, devices, assemblies and / or combinations thereof.

Unless otherwise specifically described, the relative arrangements, mathematical formulas and numerical values of the members and steps described in these examples do not limit the scope of the present invention. At the same time, for convenience of explanation, it should be understood that the dimensions of each part shown in the drawings are not drawn in actual ratio relations. Detailed description of techniques, methods and equipment known to those of skill in the art may be omitted, but if necessary, such techniques, methods and equipment should be considered as part of the approved specification. .. All examples shown and described here should be construed as being exemplary and not limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar signs and letters represent similar things in the drawings below, so once one is defined in one drawing, it does not need to be further described in subsequent drawings. be.

In the description of the present invention, the direction or position represented by directional terms such as "front, back, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom". The relationships are generally based on the orientations or positional relationships shown in the drawings, but these orientations are for the sake of facilitation and brevity of the present invention and, in the absence of a reverse explanation, these orientations. The term is intended to limit the scope of protection of the invention as it does not necessarily indicate or imply that the indicated device or element necessarily has a particular orientation or is configured and operated in a particular orientation. It should not be understood, the directional term "inside, outside" is inside, outside with respect to the contour of each member itself.

For convenience of explanation, one device as shown in the figure, using spatial relative terms such as "above ...", "above ...", "on top of ...", "above", etc. Alternatively, the spatial positional relationship between the feature and another device or feature can be explained. It should be understood that the spatial relative terminology is intended to include different orientations during use or operation other than the orientations shown in the device diagram. For example, when a device in a drawing is inverted upside down, a device described as "above another device or structure" or "on top of another device or structure" is subsequently described as "on top of another device or structure". It will be positioned "down" or "under other device or structure". Thus, the exemplary term "above ..." can include two orientations, "above ..." and "below ...". The device can also be positioned in other different ways (rotated 90 degrees or located in other orientations) and can have corresponding interpretations of the relative description of space used herein.

Furthermore, it should be explained that limiting the parts using terms such as "first" and "second" is only for distinguishing the corresponding parts, and unless otherwise specified, the above is mentioned. The term has no special meaning and should not be understood as limiting the scope of protection of the invention.

The above description is merely a preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and changed in various ways. Any modifications, equivalent substitutions, improvements, etc. made within the gist and principles of the invention should be included within the scope of the invention.

Claims (15)

Valve body (10) and
A rotor (20) rotatably provided in the valve body (10) and
The fixed seat (30) fixed in the valve body (10) and
Provided between the rotor (20) and the fixed seat (30), one of the inner ring and the outer ring is connected to the rotor (20), and the other is connected to the fixed seat (30). An electronic expansion valve, including a bearing (40). The screw (50) provided in the valve body (10) is further included, and the screw (50) has a rotor having a fixed seat (30) and a bearing (40) inserted in order at one end thereof. The electronic expansion valve according to claim 1, wherein the rotor (20) is screwed to (20) and is used to drive the screw (50) to move along the axial direction. The rotor (20) is
A magnetic material (21) provided on the outside of the screw (50) and
Including a connecting plate (22) provided on the magnetic material (21) and into which the screw (50) is inserted and screwed.
The connection plate (22) and the fixed seat (30) are respectively located on both sides of the bearing (40), one of the inner ring and the outer ring of the bearing is connected to the connection plate (22), and the other is connected to the connection plate (22). The electronic expansion valve according to claim 2, which is connected to the fixed seat (30). The electronic expansion valve according to claim 2, wherein the screw (50) is fitted in a gap with the fixed seat (30). Further, a first limiting structure provided between the screw (50) and the fixed seat (30) and used to limit the displacement and rotation of the screw (50) with respect to the fixed seat (30). 2. The electronic expansion valve according to claim 2. The first limiting structure is
A stopper piece (61) which is fixed to the screw (50), has an extension end, and has an angle between the extension direction of the extension end and the axial direction of the screw (50).
A guide limiting groove (62) provided on the side wall of the fixed seat (30) and whose extension direction coincides with the axial direction of the screw (50) is included.
The guide limiting groove (62) is such that the extended end of the stop piece (61) is located in the guide limiting groove (62) and limits the displacement and rotation of the screw (50) with respect to the fixed seat (30). 62) The electronic expansion valve according to claim 5, wherein the stop piece (61) is engaged with the stop piece (61). The first limiting structure is
The first boss (63) provided on the side wall of the screw (50) and
Including a second boss (64) provided on the inner wall of the fixed seat (30).
The electron according to claim 5, wherein the first boss (63) is engaged with the second boss (64) so as to limit the displacement of the screw (50) with respect to the fixed seat (30). Expansion valve. The valve body (10) includes a sleeve (11) and a valve seat (12), and the rotor (20), the fixed seat (30), the bearing (40) and the screw (50) are all included. The electronic expansion valve according to claim 2, which is provided between the sleeve (11) and the valve seat (12). The valve seat (12) has a valve chamber (12a) and a mounting hole communicating with the valve chamber (12a).
The electronic expansion valve further includes a spindle assembly (70), which is movably provided in the mounting hole and connected to the screw (50) to close the valve opening. The electronic expansion valve according to claim 8, which has a first position and a second position for opening the valve opening. The valve body (10) is
Further including a socket (13) provided on the outside of the spindle assembly (70) and fixed in the mounting hole.
The electronic expansion valve according to claim 9, wherein one end of the fixed seat (30) away from the bearing (40) is connected to the end of the socket (13). The spindle assembly (70) is
A valve socket (71) movably provided in the mounting hole and to which one end of the screw (50) is connected.
A spindle (72) whose one end is movably provided in the valve socket (71),
A pretension spring (located in the valve socket (71) and located between the valve socket (71) and the spindle (72) and used to provide pretension to the spindle (72). 73) The electronic expansion valve according to claim 9. The spindle assembly (70) is
It further comprises a second limiting structure provided between the spindle (72) and the screw (50) and used to limit the relative displacement of the spindle (72) and the screw (50). The electronic expansion valve according to claim 11. A first limiting hole is provided at one end of the spindle (72) located in the valve socket (71).
The second limiting structure is
A sphere (74) provided in the valve socket (71) and partially provided in the first limiting hole.
A second limiting hole is provided between the sphere (74) and the screw (50), and a part of the sphere (74) is provided in the second limiting hole. Including the gasket (75)
12. The twelfth aspect of claim 12, wherein one end of the pretension spring (73) is connected to the valve socket (71) and the other end of the pretension spring (73) is connected to the gasket (75). Electronic expansion valve. The electronic expansion valve according to claim 3, wherein an annular flange covering the outside of the bearing (40) is provided on the side of the connection plate (22) toward the bearing (40). The fixed seat (30) has a through hole having a non-circular cross section, the screw (50) has a threaded portion and a limiting portion, and the threaded portion of the screw (50) is the rotor (50). 20), wherein the cross section of the limiting portion and the cross section of the through hole are aligned with each other so as to limit the rotation of the screw (50) with respect to the fixed seat (30). The electronic expansion valve described.

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