CN219975363U - Electronic expansion valve - Google Patents

Abstract

The embodiment provides an electronic expansion valve, which belongs to the technical field of expansion valves. The electronic expansion valve comprises a shell, a rotor assembly, a rotating shaft, a connecting block and a valve needle assembly. The casing has the installation cavity, and is provided with inlet and the liquid outlet with installation cavity intercommunication. The connecting block is fixedly connected with the rotating shaft, and a clamping part is arranged on the connecting block. The rotor assembly is provided with a through hole, and one end of the rotor assembly is provided with a matching part matched with the clamping part. The rotating shaft is inserted in the through hole and is rotationally connected with the shell. The clamping part is embedded with the matching part, so that the rotating shaft and the rotor assembly can synchronously rotate. The valve needle assembly is in transmission connection with the rotating shaft, and the rotating shaft can drive the valve needle to move so as to open or close the liquid outlet. The rotor and the rotating shaft can be assembled with reduced difficulty under the condition that synchronous rotation of the rotating shaft and the rotor is guaranteed.

Description

Electronic expansion valve

Technical Field

The utility model relates to the field of electronic expansion valves, in particular to an electronic expansion valve.

Background

The electronic expansion valve utilizes the electric signal generated by the adjusted parameters to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply amount. The stepless variable capacity refrigerating system has wide refrigerating liquid supply amount regulating range, fast regulating reaction, and the traditional throttling device, such as a thermal expansion valve, is difficult to be qualified, and the electronic expansion valve can meet the requirement well.

The electronic expansion valve is generally arranged in the refrigerant loop and used for adjusting the flow of the refrigerant in the loop so as to meet different working condition demands, and the electronic expansion valve is divided into three parts: the motor is divided into a stator and a rotor, and the rotor and the mechanical part are integrated in the valve in the current design of the electronic expansion valve.

In the prior art, in order to realize synchronous rotation of the rotor and the rotating shaft, the rotor and the rotating shaft are generally installed in an interference fit manner, and the assembly requirement is high.

Disclosure of Invention

The utility model aims to provide an electronic expansion valve which can reduce the assembly difficulty of a rotor and a rotating shaft under the condition of ensuring synchronous rotation of the rotating shaft and the rotor.

Embodiments of the present utility model are implemented as follows:

the utility model provides an electronic expansion valve, which comprises a shell, a rotor assembly, a rotating shaft, a connecting block and a valve needle assembly, wherein the rotor assembly is arranged on the shell;

the shell is provided with an installation cavity, and a liquid inlet and a liquid outlet which are communicated with the installation cavity are formed in the shell;

the connecting block is fixedly connected with the rotating shaft, and a clamping part is arranged on the connecting block;

the rotor assembly is provided with a through hole, and one end of the rotor assembly is provided with a matching part matched with the clamping part;

the rotating shaft is inserted into the through hole and is rotationally connected with the shell;

the clamping part is embedded with the matching part, so that the rotating shaft and the rotor assembly can synchronously rotate;

the valve needle assembly is in transmission connection with the rotating shaft, and the rotating shaft can drive the valve needle assembly to move so as to open or close the liquid outlet.

In an alternative embodiment, the connecting block is annular and sleeved on the rotating shaft;

the clamping parts are a plurality of protruding blocks, and the plurality of protruding blocks are arranged on the side wall of the connecting block at equal intervals along the circumferential direction of the connecting block;

one end of the rotor assembly is provided with an installation groove corresponding to the connecting block, the rotor assembly is matched with a limit groove arranged on the side wall of the installation groove, the limit groove corresponds to the protruding block, the connecting block is assembled in the installation groove, and the protruding block is clamped in the limit groove.

In an alternative embodiment, the depth of the mounting groove is less than the height of the rotor assembly and the depth of the mounting groove is less than or equal to the connecting block height.

In an alternative embodiment, the rotor assembly includes a bearing, a rotor seat, and a magnet;

the magnet is mounted on the rotor seat;

the through hole is arranged on the rotor seat, and the matching part is arranged at one end of the rotor seat;

the shell comprises a bearing mounting seat and a mounting assembly;

the bearing is arranged at one end of the rotating shaft far away from the valve needle assembly, and is pressed in the bearing mounting seat;

a lower limit table is arranged at one end, close to the bottom surface of the bearing, of the bearing mounting seat, the lower limit table is in butt joint with the bottom surface of the bearing, and/or an upper limit table is arranged at the top of the rotating shaft, and the upper limit table is in butt joint with the top wall of the bearing;

the installation component install in the bearing mount pad, the inlet with the liquid outlet set up in the installation component, the needle subassembly set up in the installation component.

In an alternative embodiment, the mounting assembly includes a barrel and a mount;

the outer periphery of the bearing mounting seat is provided with a first limit boss, and the outer periphery of the mounting seat is provided with a second limit boss;

one end of the cylinder body is sleeved on the bearing mounting seat and is abutted to the first limiting boss, and the other end of the cylinder body is sleeved on the outer periphery of the mounting seat and is abutted to the second limiting boss.

In an optional embodiment, the electronic expansion valve further comprises a backing ring, the backing ring is sleeved on the rotating shaft, the top wall of the backing ring is abutted to the bearing, and the bottom surface of the backing ring is abutted to the rotor seat.

In an alternative embodiment, the mounting base comprises a base body and a limit sleeve;

the liquid inlet and the liquid outlet are arranged on the seat body;

one end of the limit sleeve is arranged in the cylinder body, and the other end of the limit sleeve is arranged in the seat body;

the electronic expansion valve further comprises a transmission nut, wherein the transmission nut is movably arranged in the limit sleeve, and the limit sleeve can limit the rotation of the transmission nut;

the bottom end of the rotating shaft is provided with threads and is assembled on the transmission nut, and the rotating shaft can drive the transmission nut to move when rotating;

the valve needle assembly is connected with the transmission nut.

In an alternative embodiment, the valve needle assembly includes a large spool, a small spool, and a first spring;

the large valve core is sleeved outside the small valve core and can move along the small valve core, the first spring is arranged in the large valve core and is in butt joint with one end of the first spring and the large valve core, and the other end of the first spring is in butt joint with the small valve core;

the large valve core is provided with a first liquid through hole, the small valve core is provided with a second liquid through hole, and the diameter of the first liquid through hole is smaller than that of the second liquid through hole;

the small valve core is connected with the transmission nut.

In an alternative embodiment, the electronic expansion valve further comprises a latch and a second spring;

the small valve core is provided with a chute;

the transmission nut is provided with a fixing hole;

the bolt is arranged in the sliding groove and the fixing hole in a penetrating way, and the small valve core between the transmission nuts can move relative to the sliding groove;

the second spring is arranged in the small valve core, one end of the second spring is in butt joint with the bolt, and the other end of the second spring is in butt joint with the small valve core.

In an alternative embodiment, the electronic expansion valve further comprises a coil assembly, which is arranged in correspondence with the rotor assembly.

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

according to the utility model, the connecting block is fixedly connected with the rotating shaft, the clamping part is arranged on the connecting block, and the through hole and the matching part are arranged on the rotor component, so that the clamping part and the matching part can be mutually clamped when the rotating shaft is assembled in the through hole, and synchronous rotation of the rotating shaft and the rotor component can be realized by utilizing the matching of the clamping part and the matching part.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 2 is a schematic vertical sectional view of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 2 at A;

FIG. 5 is a schematic cross-sectional view of a bearing mounting seat structure of an electronic expansion valve according to an embodiment of the present utility model;

fig. 6 is a schematic cross-sectional view of a connection block of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view illustrating a rotor seat of an electronic expansion valve according to an embodiment of the present utility model;

fig. 8 is a schematic sectional view illustrating an exploded structure of a rotor seat and a connection block of an electronic expansion valve according to another embodiment of the present utility model.

Icon: 100-electronic expansion valve; 110-a housing; 111-a mounting cavity; 113-a liquid inlet; 115-a liquid outlet; 117-bearing mount; 119-mounting an assembly; 121-a lower limit table; 122-a base; 123-cylinder; 124-a limit sleeve; 125-mounting base; 127-first limit boss; 129-second limit boss; 130-a rotor assembly; 131-through holes; 133-mating part; 135-bearing; 137-rotor seat; 139-magnet; 141-mounting slots; 150-rotating shaft; 151-an upper limit table; 170-connecting blocks; 171-an engagement portion; 190-a valve needle assembly; 191-large valve core; 193-small spool; 195-a first spring; 197-first liquid through holes; 199-second liquid through holes; 201-ring grooves; 203-a metal gasket; 205-a chute; 210-backing ring; 230-a drive nut; 231-fixing holes; 250-plug pins; 270-a second spring.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the present embodiment provides an electronic expansion valve 100 for adjusting the flow rate in a refrigerant circulation pipeline.

Referring to fig. 1-7, in the present embodiment, the electronic expansion valve 100 includes a housing 110, a rotor assembly 130, a rotating shaft 150, a connecting block 170, and a valve needle assembly 190. The housing 110 has a mounting chamber 111, and is provided with a liquid inlet 113 and a liquid outlet 115 communicating with the mounting chamber 111. The connection block 170 is fixedly connected to the rotation shaft 150, and an engagement portion 171 is provided on the connection block 170. The rotor assembly 130 is provided with a through hole 131, and one end of the rotor assembly 130 is provided with an engaging portion 133 engaged with the engaging portion 171. The rotating shaft 150 is inserted into the through hole 131 and is rotatably connected to the housing 110. The engaging portion 171 is engaged with the engaging portion 133, so that the rotation shaft 150 and the rotor assembly 130 can rotate synchronously. The valve needle assembly 190 is in driving connection with the rotating shaft 150, and the rotating shaft 150 rotates to drive the valve needle to move so as to open or close the liquid outlet 115.

The utility model is characterized in that the connecting block 170 is fixedly connected with the rotating shaft 150, the clamping part 171 is arranged on the connecting block 170, and the through hole 131 and the matching part 133 are arranged on the rotor assembly 130, so that the clamping part 171 and the matching part 133 can be mutually clamped when the rotating shaft 150 is assembled in the through hole 131, and the synchronous rotation of the rotating shaft 150 and the rotor assembly 130 can be realized by utilizing the matching of the clamping part and the matching part 133.

In this embodiment, the connection block 170 is annular, and is sleeved on the rotating shaft 150, and is fixedly connected with the rotating shaft 150 by welding or the like. The engaging portion 171 is a plurality of protruding blocks, and the plurality of protruding blocks and the connecting block 170 are integrally formed. The plurality of bumps are disposed at equal intervals along the circumferential direction of the connection block 170 on the side wall of the connection block 170. One end of the rotor assembly 130 is provided with a mounting groove 141 corresponding to the connecting block 170, and the matching portion 133 is a limiting groove arranged on the side wall of the mounting groove 141, and the limiting groove corresponds to the bump in size. The connection block 170 is assembled in the mounting groove 141, and the protruding block is clamped in the limiting groove.

Referring to fig. 1 to 7, in the present embodiment, the engaging portion 171 and the mating portion 133 are respectively configured as a protruding block and a limiting groove, and the protruding block and the limiting groove are engaged, so that the rotation shaft 150 and the rotor assembly 130 can be ensured to rotate synchronously. The provision of the lugs allows the connection block 170 to be non-cylindrical, which in turn allows for circumferential spacing with the rotor assembly 130. The engaging portions 171 are disposed at equal intervals, so that the center of gravity of the rotating shaft 150 and the rotor assembly 130 is ensured to be on the axis of the rotating shaft 150, and thus the stability of the rotation of the rotating shaft 150 can be ensured.

Referring to fig. 8, in other embodiments of the present utility model, the connecting block 170 may be shaped as a special shape, and the mounting groove 141 may be configured to match the shape. For example, the connection block 170 may be a regular polygonal prism, such as a triangular prism or a square, and may be an irregular column such as an elliptic column or a bar column. The engaging portion 171 is defined by a person. In some embodiments of the present utility model, it is only necessary to ensure that the connection block 170 is not cylindrical.

In this embodiment, the depth of the mounting groove 141 is smaller than the height of the rotor assembly 130, so that the mounting block can be partially embedded in the rotor assembly 130, and therefore, the top wall of the connecting block 170 can be attached to the top wall of the mounting groove 141, so as to limit the rotor assembly 130.

In the present embodiment, the rotor assembly 130 includes a bearing 135, a rotor seat 137, and a magnet 139. The magnet 139 is mounted to the rotor mount 137. The rotor seat 137 is cylindrical, and an upper injection molding groove and a lower injection molding groove are provided above. The magnet 139 includes an upper magnet 139 and a lower magnet 139, and the upper magnet 139 and the lower magnet 139 are directly and respectively molded on an upper injection molding seat and a lower injection molding seat of the rotor seat 137 by injection molding. This facilitates assembly of the magnet 139 and the rotor mount 137 and makes the mounting after injection molding more secure.

Referring to fig. 1-7, in the present embodiment, the through hole 131 is disposed in the axial direction of the rotor seat 137, and the mounting groove 141 is disposed at the lower end of the rotor seat 137 and communicates with the through hole 131. The diameter of the shaft 150 inserted into the through hole 131 is slightly larger than the diameters of the upper and lower ends thereof, so that the shaft 150 can be conveniently installed.

In this embodiment, the housing 110 includes a bearing mount 117 and a mounting assembly 119. The bearing 135 is mounted to an end of the shaft 150 remote from the needle assembly 190, and the bearing 135 is press fit within the bearing mount 117. The one end that the bearing mount 117 is close to the bottom surface of bearing 135 is provided with lower spacing platform 121, and lower spacing platform 121 and the bottom surface butt of bearing 135. An upper limiting table 151 is arranged at the top of the rotating shaft 150, and the upper limiting table 151 is abutted with the top wall of the bearing 135. The lower limiting table 121 is formed by extrusion or the like after the bearing 135 is mounted in the bearing mounting seat 117, so that the bearing 135 can be stably mounted in the bearing mounting seat 117, and the bearing 135 can be prevented from shaking up and down along the bearing mounting seat 117 under the condition of axial force. The upper limiting table 151 may limit the rotation shaft 150 to move up and down along the axial direction, so as to prevent the rotation shaft 150 from shaking. The upper limit stage 151 may be formed by pressing an end portion of the rotation shaft 150 after the bearing 135 is installed, or may be an outer check ring installed to the rotation shaft 150. In this embodiment, the upper limiting table 151 is a retainer ring.

In this embodiment, the electronic expansion valve 100 further includes a backing ring 210, the backing ring 210 is sleeved on the rotating shaft 150, the top wall of the backing ring 210 abuts against the inner ring of the bearing 135, and the bottom surface of the backing ring 210 abuts against the rotor seat 137. In this way, the connection block 170, the rotor seat 137, the backing ring 210 and the upper limit boss are sequentially abutted, and the lower limit table 121 limits the bearing 135, so that the vertical shaking of the rotating shaft 150 caused by assembly can be avoided.

The concrete assembly is as follows:

the bearing 135 is firstly installed on the rotating shaft 150, and then the upper limiting table 151 is installed on the rotating shaft 150 to be abutted with the upper end face of the bearing 135. The bearing 135 is pressed into the bearing mounting seat 117, the bearing mounting seat 117 is pressed to form the lower limit table 121, so that the bearing 135 is fixed in the bearing mounting seat 117, the backing ring 210 is mounted, and finally the rotor seat 137 is pressed onto the rotating shaft 150.

In general, the end of the bearing mounting seat 117 is provided with a deformation groove or a claw, and when the lower limit table 121 is formed by pressing, the lower limit table 121 is bent inwards by applying pressure to the deformation groove or the claw, so that the lower limit table 121 is clamped on the bottom surface of the bearing 135.

Referring to fig. 1-6, in the present embodiment, a mounting assembly 119 is mounted on a bearing mounting seat 117, a liquid inlet 113 and a liquid outlet 115 are disposed on the mounting assembly 119, and a valve needle assembly 190 is disposed in the mounting assembly 119.

The mounting assembly 119 includes a barrel 123 and a mount 125. The cylinder 123 has a straight cylindrical shape. The outer periphery of the bearing mount 117 is provided with a first limit boss 127, and the outer periphery of the mount 125 is provided with a second limit boss 129. One end of the cylinder 123 is sleeved on the bearing mounting seat 117, is abutted against the first limiting boss 127, and is welded with the bearing mounting seat 117. The other end of the cylinder 123 is sleeved on the outer periphery of the mounting seat 125, abuts against the second limiting boss 129 and is welded with the mounting seat 125. This arrangement can make the manufacturing thereof simpler and can reduce the manufacturing cost of the housing 110.

In this embodiment, the mounting block 125 includes a block 122 and a stop sleeve 124. The liquid inlet 113 and the liquid outlet 115 are disposed on the base 122. One end of the limiting sleeve 124 is installed in the cylinder 123 and welded with the cylinder 123, and the other end is installed in the base 122 and welded with the base 122.

In this embodiment, the electronic expansion valve 100 further includes a drive nut 230, the drive nut 230 is movably mounted in the limit sleeve 124, and the limit sleeve 124 can limit the rotation of the drive nut 230. The bottom end of the rotating shaft 150 is provided with threads and is assembled on the transmission nut 230, and the rotating shaft 150 rotates to drive the transmission nut 230 to move. The valve pin assembly 190 is coupled to a drive nut 230. The valve needle assembly 190 includes a large valve spool 191, a small valve spool 193, and a first spring 195. The large valve core 191 is sleeved outside the small valve core 193 and can move along the small valve core 193. The first spring 195 is provided in the large valve element 191, and has one end abutting against the large valve element 191 and the other end abutting against the small valve element 193. The large valve core 191 is provided with a first liquid through hole 197, the small valve core 193 is provided with a second liquid through hole 199, and the diameter of the first liquid through hole 197 is smaller than that of the second liquid through hole 199. The small spool 193 is connected to the drive nut 230.

Thus, the large valve core 191 is tightly closed when being attached to the inner bottom surface of the seat 122, and is opened when being far away. The outer wall surface of the small valve core 193 is attached to the inner cavity wall surface of the large valve core 191, the small valve core 193 can move up and down in the inner cavity of the large valve core 191, the top of the small valve core 193 is provided with a stepped circular groove 201, a metal gasket 203 is arranged in the stepped circular groove, the top of the large valve core 191 is buckled and pressed with the metal gasket 203, the small valve core 193 can move up and down in the inner cavity of the large valve core 191, and the buckled metal gasket 203 can limit the upward movement of the small valve core 193. The cylindrical protruding part at the bottom of the small valve core 193 is tightly attached to the circular channel hole at the bottom of the inner cavity of the large valve core 191, and is opened away from the small valve core 193.

Referring to fig. 1-6, in the present embodiment, the electronic expansion valve 100 further includes a latch 250 and a second spring 270. The small spool 193 is provided with a chute 205. The driving nut 230 is provided with a fixing hole 231. The latch 250 is inserted into the sliding slot 205 and the fixing hole 231, and the small valve core 193 between the transmission nuts 230 can move relative to the sliding slot 205. The second spring 270 is disposed in the small valve core 193, and has one end abutting against the latch 250 and the other end abutting against the small valve core 193.

The valve needle assembly 190 assembled by the small valve core 193 and the large valve core 191 is slidably connected with the transmission nut 230 through the bolt 250, and the second spring 270 is arranged between the small valve core 193 and the transmission nut, so that the small valve core 193 and the large valve core 191 are in non-rigid connection, and hard abutting between the small valve core 193 and the large valve core 191 can be avoided.

In this embodiment, the electronic expansion valve 100 further includes a coil assembly disposed outside the housing 110 and corresponding to the rotor seat 137, and energizing the coil assembly can drive the rotor seat 137 to rotate.

In summary, the electronic expansion valve 100 provided by the embodiment of the utility model has the following beneficial effects:

in this embodiment, through the connection block 170 fixedly connected to the rotation shaft 150, the engagement portion 171 is disposed on the connection block 170, and the through hole 131 and the mating portion 133 are disposed on the rotor assembly 130, so that when the rotation shaft 150 is assembled in the through hole 131, the engagement portion 171 and the mating portion 133 can be engaged with each other, and thus the rotation of the rotation shaft 150 and the rotor assembly 130 can be achieved by using the engagement of the engagement portion and the mating portion 133, compared with the prior art, the interference fit between the rotation shaft 150 and the mounting hole is not required, and the assembly difficulty of the rotation shaft 150 and the rotor assembly 130 can be reduced. And the rotation shaft 150 can be prevented from being separated from the bearing 135, and the bearing 135 is prevented from being separated from the bearing mount 117, so that the service life of the electronic expansion valve 100 can be improved.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An electronic expansion valve is characterized by comprising a shell (110), a rotor assembly (130), a rotating shaft (150), a connecting block (170) and a valve needle assembly (190);

the shell (110) is provided with a mounting cavity (111), and is provided with a liquid inlet (113) and a liquid outlet (115) which are communicated with the mounting cavity (111);

the connecting block (170) is fixedly connected with the rotating shaft (150), and a clamping part (171) is arranged on the connecting block (170);

the rotor assembly (130) is provided with a through hole (131), and one end of the rotor assembly (130) is provided with a matching part (133) matched with the clamping part (171);

the rotating shaft (150) is inserted into the through hole (131) and is rotationally connected with the shell (110);

the engaging part (171) is engaged with the matching part (133) and can synchronously rotate the rotating shaft (150) and the rotor assembly (130);

the valve needle assembly (190) is in transmission connection with the rotating shaft (150), and the rotating shaft (150) can drive the valve needle assembly (190) to move so as to open or close the liquid outlet (115).

2. The electronic expansion valve according to claim 1, wherein the connecting block (170) is annular and is sleeved on the rotating shaft (150);

the engaging part (171) is provided with a plurality of protruding blocks, and the plurality of protruding blocks are arranged on the side wall of the connecting block (170) at equal intervals along the circumferential direction of the connecting block (170);

one end of the rotor assembly (130) is provided with a mounting groove (141) corresponding to the connecting block (170), the matching part (133) is a limiting groove arranged on the side wall of the mounting groove (141), the limiting groove corresponds to the protruding block, the connecting block (170) is assembled in the mounting groove (141), and the protruding block is clamped in the limiting groove.

3. The electronic expansion valve of claim 2, wherein the mounting groove (141) has a depth less than a height of the rotor assembly (130).

4. The electronic expansion valve of claim 2, wherein the rotor assembly (130) includes a bearing (135), a rotor seat (137), and a magnet (139);

the magnet (139) is mounted to the rotor seat (137);

the through hole (131) is arranged on the rotor seat (137), and the matching part (133) is arranged at one end of the rotor seat (137);

the housing (110) includes a bearing mount (117) and a mounting assembly (119);

the bearing (135) is arranged at one end of the rotating shaft (150) far away from the valve needle assembly (190), and the bearing (135) is pressed in the bearing mounting seat (117);

a lower limit table (121) is arranged at one end, close to the bottom surface of the bearing (135), of the bearing mounting seat (117), the lower limit table (121) is in butt joint with the bottom surface of the bearing (135), and/or an upper limit table (151) is arranged at the top of the rotating shaft (150), and the upper limit table (151) is in butt joint with the top wall of the bearing (135);

the mounting assembly (119) is mounted on the bearing mounting seat (117), the liquid inlet (113) and the liquid outlet (115) are formed in the mounting assembly (119), and the valve needle assembly (190) is arranged in the mounting assembly (119).

5. The electronic expansion valve of claim 4, wherein the mounting assembly (119) comprises a barrel (123) and a mount (125);

the outer periphery of the bearing mounting seat (117) is provided with a first limit boss (127), and the outer periphery of the mounting seat (125) is provided with a second limit boss (129);

one end of the cylinder body (123) is sleeved on the bearing mounting seat (117) and is abutted to the first limiting boss (127), and the other end of the cylinder body (123) is sleeved on the outer periphery of the mounting seat (125) and is abutted to the second limiting boss (129).

6. The electronic expansion valve according to claim 5, further comprising a backing ring (210), wherein the backing ring (210) is sleeved on the rotating shaft (150), a top wall of the backing ring (210) is abutted with the bearing (135), and a bottom surface of the backing ring (210) is abutted with the rotor seat (137).

7. The electronic expansion valve of claim 5, wherein the mounting block (125) includes a block body (122) and a limit sleeve (124);

the liquid inlet (113) and the liquid outlet (115) are arranged on the seat body (122);

one end of the limit sleeve (124) is arranged in the cylinder body (123), and the other end of the limit sleeve is arranged in the seat body (122);

the electronic expansion valve further comprises a transmission nut (230), wherein the transmission nut (230) is movably arranged in the limit sleeve (124), and the limit sleeve (124) can limit the rotation of the transmission nut (230);

the bottom end of the rotating shaft (150) is provided with threads and is assembled on the transmission nut (230), the rotating shaft (150) rotates to drive the transmission nut (230) to move,

the valve needle assembly (190) is connected to the drive nut (230).

8. The electronic expansion valve of claim 7, characterized in that the valve needle assembly (190) comprises a large valve spool (191), a small valve spool (193), and a first spring (195);

the large valve core (191) is sleeved outside the small valve core (193) and can move along the small valve core (193), the first spring (195) is arranged in the large valve core (191), one end of the first spring (195) is abutted with the large valve core (191), and the other end of the first spring is abutted with the small valve core (193);

the large valve core (191) is provided with a first liquid through hole (197), the small valve core (193) is provided with a second liquid through hole (199), and the diameter of the first liquid through hole (197) is smaller than that of the second liquid through hole (199);

the small valve core (193) is connected with the transmission nut (230).

9. The electronic expansion valve of claim 8, further comprising a latch (250) and a second spring (270);

the small valve core (193) is provided with a chute (205);

the transmission nut (230) is provided with a fixing hole (231);

the bolt (250) is arranged in the sliding groove (205) and the fixing hole (231) in a penetrating way, and the small valve core (193) between the transmission nuts (230) can move relative to the sliding groove (205);

the second spring (270) is arranged in the small valve core (193), one end of the second spring is abutted with the plug pin (250), and the other end of the second spring is abutted with the small valve core (193).

10. The electronic expansion valve of claim 1, further comprising a coil assembly disposed in correspondence with the rotor assembly (130).