Motor and electronic expansion valve

Abstract

The application discloses a motor and an electronic expansion valve, and relates to the technical field of electronic expansion valves, the motor being used for the electronic expansion valve, and the motor comprising: a rotor assembly, the rotor assembly being connected with a valve needle of the electronic expansion valve to drive the valve needle to move; a stator assembly, the stator assembly comprising a pole claw assembly, a partition piece and a coil assembly, the pole claw assembly comprising a pole claw main body and a connecting portion which are connected, the pole claw main body being located in the partition piece, the partition piece being provided with a connecting hole, the connecting portion being arranged in the connecting hole and being in sealed connection with the connecting hole, the connecting portion being connected with the coil assembly, the pole claw assembly and the partition piece defining a first cavity, and the rotor assembly being located in the first cavity. According to the motor provided in the embodiment of the application, the sealed first cavity is defined by the pole claw assembly and the partition piece to accommodate the rotor assembly, the pole claw main body of the pole claw assembly is located in the partition piece, the distance between the outer circumferential surface of the rotor assembly and the pole claw main body can be shortened, the air gap of the motor can be reduced, the magnetic leakage of the motor can be reduced, and the performance of the motor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic expansion valve, more particularly, to a motor and an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve usually comprises a motor, and the motor has sealing requirements due to the medium flowing in the electronic expansion valve. In the related art, the sealing components in the motor are designed unreasonably, which leads to a large air gap of the motor, increases the magnetic flux leakage of the motor, and reduces the performance of the motor. SUMMARY

[0003] The present application aims to solve at least one of the problems in the prior art. To this end, one object of the present application is to provide a motor, which realizes sealing through a claw assembly and a partition, the claw body of the claw assembly is located in the partition, which can shorten the distance between the outer circumferential surface of the rotor assembly and the claw body, is conducive to reducing the air gap of the motor, reducing the magnetic flux leakage of the motor, and improving the performance of the motor.

[0004] Another object of the present application is to provide an electronic expansion valve having the above motor.

[0005] According to the motor of the present application, the motor for the electronic expansion valve comprises a rotor assembly connected with a valve needle of the electronic expansion valve to drive the valve needle to move, a stator assembly comprising a claw assembly, a partition and a coil assembly, the claw assembly comprising a claw body and a connecting portion connected with each other, the claw body being located in the partition, the partition being provided with a connecting hole, the connecting portion being arranged in the connecting hole and being in sealing connection with the connecting hole, the connecting portion being connected with the coil assembly, the claw assembly and the partition defining a first chamber, and the rotor assembly being located in the first chamber.

[0006] According to the motor of the present application, the first chamber is defined by the claw assembly and the partition to accommodate the rotor assembly, the claw body of the claw assembly is located in the partition, which can shorten the distance between the outer circumferential surface of the rotor assembly and the claw body, is conducive to reducing the air gap of the motor, reducing the magnetic flux leakage of the motor, and improving the performance of the motor, and integrating the claw assembly and the partition can reduce the overall volume of the motor to realize the miniaturization of the motor.

[0007] In addition, the motor according to the above embodiments of the present application can also have the following additional technical features:

[0008] According to some embodiments of the present application, the partition comprises a sleeve located radially outside the pole claw body and a cover located axially on one side of the pole claw body, and the annular hole extending circumferentially between the sleeve and the cover is the connection hole, one end of the pole claw assembly is sealingly connected with the cover and the other end is sealingly connected with the valve seat of the electronic expansion valve.

[0009] According to some embodiments of the present application, the pole claw body comprises at least one pole claw group, the pole claw group comprises two pole claws arranged axially, each of the pole claws comprises claw parts arranged circumferentially and a yoke part for connecting the claw parts, the yoke part is provided with the connection part radially outside, and the claw parts of the two pole claws of the same pole claw group are staggered and inserted.

[0010] According to some embodiments of the present application, the sleeve continuously extends axially along the rotor assembly.

[0011] According to some embodiments of the present application, the coil assembly comprises a plurality of coils arranged axially, the pole claw groups are one-to-one corresponding to the plurality of coils, the adjacent yoke parts of the adjacent pole claw groups are connected integrally, and the sleeves are one-to-one corresponding to the plurality of pole claw groups, and the annular hole extending circumferentially between the adjacent sleeves is the connection hole.

[0012] According to some embodiments of the present application, the connection part is a plurality of, the coil assembly further comprises a magnetic conducting frame and a coil, the magnetic conducting frame comprises a plurality of connection fitting parts arranged axially, the plurality of connection fitting parts extend radially and are one-to-one corresponding to the plurality of connection parts, and the coil is arranged between the adjacent two connection fitting parts.

[0013] According to some embodiments of the present application, the motor further comprises a shell, the shell is an injection molded body and injection molded to wrap the coil assembly, and the partition is installed in the shell.

[0014] According to some embodiments of the present application, the gap between the rotor assembly and the pole claw assembly is less than or equal to 0.3 mm.

[0015] According to some embodiments of the present application, the electronic expansion valve comprises the motor according to some embodiments of the present application.

[0016] According to some embodiments of the present application, the electronic expansion valve further comprises a valve seat and a valve needle, the valve seat is connected with the pole claw assembly and defines a second chamber, the second chamber has an opening in communication with the outside for flowing medium, and the valve needle is located in the second chamber and connected with the rotating shaft of the rotor assembly.

[0017] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The foregoing and / or additional aspects and advantages of the present application are achieved by providing an electronic expansion valve, comprising:

[0019] Figure 1 is a structural schematic diagram of an electronic expansion valve according to an embodiment of the present application;

[0020] Figure 2 is a front view of Figure 1

[0021] Figure 3 is a sectional view along the direction indicated by line A-A of Figure 2

[0022] Figure 4 is an enlarged view of the circle B in Figure 3

[0023] Figure 5 is a sectional view of a partition and pole claw assembly according to an embodiment of the present application;

[0024] Figure 6 is an exploded view of Figure 5

[0025] Figure 7 is a sectional view of a housing and coil assembly according to an embodiment of the present application;

[0026] Figure 8 is an exploded view of Figure 7

[0027] REFERENCE NUMERALS:

[0028] Electronic expansion valve 1000;

[0029] Motor 100; valve seat 200; second chamber 210; valve port 220; inlet 230; outlet 240; valve needle 300; transmission member 400;

[0030] Rotor assembly 10; rotating shaft 11;

[0031] Stator assembly 20; first chamber 201;

[0032] Pole claw assembly 21; pole claw body 211; pole claw group 2111; pole claw 2112; claw portion 2113; yoke portion 2114; connecting portion 212;

[0033] Partition 22; connecting hole 221; sleeve 222; cover 223; ​​​​​

[0034] Coil assembly 23; Coil 231; Permeable frame 232; Connection fitting 2321; Frame body 2322; Upper frame body 2323; Lower frame body 2324;

[0035] Housing 30; Axial direction F1 of rotor assembly 10. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like designations indicate the same or like elements or features that have the same or similar function(s). The embodiments described below are illustrative only, and are not intended to be limiting on the present application.

[0037] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In the description of the present application, "first feature" and "second feature" can include one or more of the features, the meaning of "a plurality of" is two or more, and "above" or "below" the second feature of the first feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature therebetween, "above", "over", and "on" the second feature of the first feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0039] A motor 100 according to an embodiment of the present application is described below with reference to the drawings.

[0040] Referring to Figures 1-8 As shown, the motor 100 according to an embodiment of the present application is used in an electronic expansion valve 1000, and the motor 100 can include a rotor assembly 10 and a stator assembly 20. The motor 100 can be a stepper motor or other type of motor, and the rotor assembly 10 can include a permanent magnet.

[0041] Specifically, the rotor assembly 10 is connected to the valve needle 300 of the electronic expansion valve 1000 to drive the valve needle 300 to move. The movement of the valve needle 300 can adjust the opening of the electronic expansion valve 1000 to throttle the medium (such as refrigerant) flowing through the electronic expansion valve 1000.

[0042] The stator assembly 20 includes a pole claw assembly 21, a separator 22, and a coil assembly 23. The pole claw assembly 21 includes a connected pole claw body 211 and a connecting portion 212. The pole claw body 211 is located within the separator 22, which has a connecting hole 221. The connecting portion 212 passes through the connecting hole 221 and is sealed to it, allowing the pole claw assembly 21 and the separator 22 to be integrated into one unit. For example, the connecting portion 212 can be sealed to the wall of the connecting hole 221. Of course, the pole claw assembly 21 can also be sealed to other areas of the separator 22. The sealing connection method can be welding (such as laser welding) or other connection methods.

[0043] The connecting part 212 is connected to the coil assembly 23, enabling a magnetic connection between the pole claw assembly 21 and the coil assembly 23. The pole claw assembly 21 and the separator 22 define a first chamber 201. The rotor assembly 10 is located in the first chamber 201, while the pole claw body 211 is located in the separator 22, placing the pole claw body 211 between the rotor assembly 10 and the separator 22. The radial distance between the pole claw assembly 21 and the outer peripheral surface of the rotor assembly 10 is small, i.e., the air gap of the motor 100 is small, resulting in better performance of the motor 100.

[0044] During the operation of the electronic expansion valve 1000, the motor 100 starts working, forming a magnetic circuit between the rotor assembly 10 and the stator assembly 20, causing the rotor assembly 10 to rotate and drive the valve needle 300 to move. By controlling the rotation of the rotor assembly 10, the movement of the valve needle 300 can be controlled to throttle the medium flowing through the electronic expansion valve 1000. However, the medium flowing through the electronic expansion valve 1000 may flow into the first chamber 201 where the rotor assembly 10 is located. Therefore, the first chamber 201 needs to be sealed to reduce the risk of leakage of the medium flowing through the electronic expansion valve 1000 from the first chamber 201 to the outside, such as the stator assembly 20. This ensures that the medium flowing through the electronic expansion valve 1000 flows through the opening of the valve needle 300 as much as possible, protects the stator assembly 20, and ensures that the throttling efficiency of the electronic expansion valve 1000 meets the requirements.

[0045] The first chamber 201 can be sealed by the pole claw assembly 21 and the partition 22 while the pole claw main body 211 of the pole claw assembly 21 is connected with the coil assembly 23. Specifically, the connecting part 212 can be connected with the coil assembly 23 by being penetrated through the connecting hole 221, and the sealed connection of the pole claw assembly 21, the partition 22, the connecting part 212 and the connecting hole 221 can separate the first chamber 201 from the environment outside the first chamber 201 such as the stator assembly 20, so that the medium in the first chamber 201 is not easy to leak outwards, and the sealing performance is good. The stator assembly 20 is also not easy to be damaged by the leaked medium, which is beneficial to protect the stator assembly 20. The material of the pole claw assembly 21 can be a magnetic conductive material, and the material of the partition 22 can be a metal non-magnetic conductive material, for example, 304 stainless steel, 303 stainless steel and the like, so that the partition 22 can achieve the sealing effect, and the cost is relatively low.

[0046] In some related technologies, the chamber in which the rotor assembly is located is sealed by a sleeve, so that the medium flowing into the chamber in which the rotor assembly is located is not easy to leak outwards. However, the sleeve is usually arranged radially between the pole claw assembly and the rotor assembly, and space needs to be reserved between the pole claw assembly and the rotor assembly to install the sleeve, which increases the air gap of the motor, so that the air gap is greater than 0.6 mm (i.e. at least a distance of one sleeve thickness), the magnetic leakage of the motor increases, and the magnetic field strength and the performance of the motor decrease.

[0047] In the present application, the partition 22 and the pole claw assembly 21 are integrated, and the first chamber 201 is defined by the partition 22 and the pole claw assembly 21, so that the first chamber 201 in which the rotor assembly 10 is located is sealed by the partition 22 and the pole claw assembly 21, and the medium flowing into the first chamber 201 is not easy to leak outwards. The pole claw main body 211 of the pole claw assembly 21 is located in the partition 22, and the rotor assembly 10 is located in the pole claw main body 211, so that space does not need to be reserved between the pole claw assembly 21 and the rotor assembly 10 to install the sleeve in the related technologies, the distance between the pole claw assembly 21 and the rotor assembly 10 can be shortened in the radial direction, the air gap of the motor 100 can be significantly reduced, the magnetic leakage of the motor 100 can be reduced, the magnetic field strength can be increased, and the performance of the motor 100 can be greatly improved.

[0048] In addition, the partition 22 and the pole claw assembly 21 are integrated, compared with the case that the partition and the pole claw assembly are separate parts in the related technologies, the overall volume of the partition 22 and the pole claw assembly 21 can be reduced, the motor 100 can be designed to be small, and the cost of the motor 100 can be reduced.

[0049] According to the motor 100 of the embodiment of the present application, the first sealed chamber 201 is defined by the claw assembly 21 and the partition 22 to accommodate the rotor assembly 10, the claw body 211 of the claw assembly 21 is located in the partition 22, the distance between the outer circumferential surface of the rotor assembly 10 and the claw body 211 can be shortened, the air gap of the motor 100 can be reduced, the magnetic leakage of the motor 100 can be reduced, the performance of the motor 100 can be improved, and the integration of the claw assembly 21 and the partition 22 can reduce the overall volume of the motor 100 to realize the miniaturization of the motor 100.

[0050] For example, in some embodiments of the present application, as shown in Figures 1-4 The gap between the rotor assembly 10 and the claw assembly 21 is L, which is less than or equal to 0.3 mm. Here, the gap between the rotor assembly 10 and the claw assembly 21 refers to the air gap of the motor 100, i.e., the radial gap between the outer circumferential surface of the rotor assembly 10 and the claw assembly 21. If L is too large, the magnetic leakage of the motor 100 will increase, and the performance of the motor 100 will be weakened. By integrating the claw assembly 21 and the partition 22, the claw body 211 is located in the partition 22, L can be less than or equal to 0.3 mm, the radial gap between the outer circumferential surface of the rotor assembly 10 and the claw assembly 21 can be shortened, the air gap of the motor 100 can be reduced, the performance of the motor 100 can be improved by more than 30%, and the performance of the motor 100 can be greatly improved. For example, L is 0.1 mm, 0.2 mm, or 0.3 mm, etc.

[0051] As shown in Figures 1-3 The electronic expansion valve 1000 according to the embodiment of the present application includes the motor 100 according to the embodiment of the present application. Since the motor 100 according to the embodiment of the present application has the above beneficial technical effects, the electronic expansion valve 1000 according to the embodiment of the present application, by the claw assembly 21 and the partition 22, defines the first sealed chamber 201 to accommodate the rotor assembly 10, the claw body 211 of the claw assembly 21 is located in the partition 22, the distance between the outer circumferential surface of the rotor assembly 10 and the claw body 211 can be shortened, the air gap of the motor 100 can be reduced, the magnetic leakage of the motor 100 can be reduced, the performance of the motor 100 can be improved, and the integration of the claw assembly 21 and the partition 22 can reduce the overall volume of the motor 100 to realize the miniaturization of the motor 100.

[0052] In some embodiments, as shown in Figures 1-3As shown, the electronic expansion valve 1000 further comprises a valve seat 200 and a valve needle 300, the valve seat 200 is connected with the pole claw assembly 21 to further seal the first chamber 201 through the valve seat 200 and improve the sealing performance of the first chamber 201. The valve seat 200 defines a second chamber 210, the second chamber 210 has an opening in communication with the outside for the flow of medium, and the valve needle 300 is located in the second chamber 210 and connected with the rotating shaft 11 of the rotor assembly 10. The opening can be multiple, each opening can be an inlet 230 or an outlet 240 of the electronic expansion valve 1000, and the number and position of the inlet 230 and the outlet 240 are not limited in the present application, as long as at least one opening is the inlet 230 and at least one opening is the outlet 240.

[0053] The rotation of the rotor assembly 10 drives the rotating shaft 11 to move, and in turn drives the valve needle 300 to move, to adjust the communication degree of the inlet 230 and the outlet 240 in the second chamber 210, that is, to adjust the opening of the electronic expansion valve 1000, to adjust the medium flowing out of the second chamber 210 from the outlet 240, and to achieve the throttling effect of the medium.

[0054] The second chamber 210 and the first chamber 201 have a communication area, the medium flowing into the second chamber 210 through the inlet 230 may flow into the first chamber 201, but the first chamber 201 can be sealed through the pole claw assembly 21, the partition 22 and the valve seat 200, so that even if the medium flows into the first chamber 201, it is not easy to flow from the first chamber 201 to the outside, so that the medium flowing through the electronic expansion valve 1000 flows more from the inlet 230 into and from the outlet 240, improving the throttling performance of the electronic expansion valve 1000. And the pole claw body 211 of the pole claw assembly 21 in the motor 100 is located in the partition 22, and the rotor assembly 10 is located in the pole claw body 211, which can shorten the distance between the outer circumferential surface of the rotor assembly 10 and the pole claw assembly 21, reduce the air gap of the motor 100, and improve the performance of the motor 100. Under the same motor power demand, the volume of the motor 100 can be made smaller, realizing the miniaturization of the motor 100.

[0055] For example, in some specific embodiments, as Figures 1-3As shown, the electronic expansion valve 1000 comprises a motor 100, a valve seat 200, a valve needle 300 and a transmission member 400, the valve seat 200 defines a second chamber 210 in communication with a first chamber 201, the valve seat 200 is provided with a plurality of inlets 230 at the bottom, the valve seat 200 is provided with a valve port 220 in communication with the second chamber 210 at the bottom, the valve port 220 is provided with an outlet 240, the medium flows into the electronic expansion valve 1000 from the inlet 230 and flows out from the outlet 240. The transmission member 400 is fixedly arranged on the valve seat 200, the rotating shaft 11 of the rotor assembly 10 in the motor 100 is threadedly connected with the transmission member 400, the valve needle 300 is movably arranged in the valve seat 200, the upper end of the valve needle 300 is connected with the rotating shaft 11 and the lower end is located at the inlet 230 and the outlet 240. In the working process of the electronic expansion valve 1000, the rotation of the rotor assembly 10 drives the rotating shaft 11 to rotate, while the transmission member 400 is fixedly arranged, so that the rotating shaft 11 rotates and moves in the up-down direction to drive the valve needle 300 to move in the up-down direction, thereby adjusting the communication degree of the inlet 230 and the outlet 240, i.e. adjusting the opening degree of the electronic expansion valve 1000.

[0056] In some embodiments of the present application, as shown in Figures 3-6 As shown, the partition 22 comprises a sleeve 222 located radially outside the pole claw body 211 and a cover 223 located on the axial F1 side of the pole claw body 211. The annular hole extending in the circumferential direction of the rotor assembly 10 between the sleeve 222 and the cover 223 is a connecting hole 221, one end of the pole claw assembly 21 in the axial F1 direction is sealingly connected with the cover 223 and the other end in the axial F1 direction is sealingly connected with the electronic expansion valve 1000 such as the valve seat 200. For ease of understanding, the following explanation takes the example of the other end of the pole claw assembly 21 in the axial F1 direction being sealingly connected with the valve seat 200, of course, the embodiments of the other end of the pole claw assembly 21 in the axial F1 direction being sealingly connected with other parts of the electronic expansion valve 1000 can also be obtained.

[0057] The pole claw assembly 21 and the partition 22 define a first chamber 201, the connecting part 212 of the pole claw assembly 21 in the axial F1 direction penetrates through the connecting hole 221 between the sleeve 222 and the cover 223 to sealingly connect the sleeve 222 and the cover 223, so as to separate the first chamber 201 from the outside of the one end in the axial F1 direction. The other end of the pole claw assembly 21 in the axial F1 direction is sealingly connected with the valve seat 200. The sleeve 222 and the pole claw assembly 21 can separate the first chamber 201 from the radially outer side such as the stator assembly 20, so that the pole claw assembly 21, the partition 22 and the valve seat 200 jointly seal the first chamber 201, which is beneficial to improve the sealing performance of the first chamber 201 and improve the working reliability of the motor 100.

[0058] In some specific embodiments, as shown in Figure 3As shown, one end of the first chamber 201 in the axial direction F1 is completely sealed, the other end of the first chamber 201 in the axial direction F1 is sealed at the joint of the pole claw assembly 21 and the valve seat 200, and the other end of the first chamber 201 in the axial direction F1 is in communication with the second chamber 210 defined by the valve seat 200.

[0059] In some embodiments, as shown, Figures 3-6 As shown, the pole claw body 211 includes at least one pole claw group 2111 (for example, Figures 3-6 As shown, the pole claw body 211 includes two pole claw groups 2111, and each pole claw group 2111 includes two pole claws 2112 arranged in the axial direction F1, and each pole claw 2112 includes a plurality of claw portions 2113 arranged in the circumferential direction and a yoke portion 2114 for connecting the plurality of claw portions 2113, and a connecting portion 212 is arranged on the radially outer side of the yoke portion 2114. The claw portions 2113 of the two pole claws 2112 of the same pole claw group 2111 are staggered and inserted to realize the magnetic connection between the rotor assembly 10, the pole claw group 2111 and the coil assembly 23, drive the rotation of the rotor assembly 10 and in turn drive the movement of the valve needle 300. For example, Figures 3-6 As shown, the claw portion 2113 extends to one side of the axial direction F1 from the yoke portion 2114, and the extending directions of the plurality of claw portions 2113 of the two pole claws 2112 of the same pole claw group 2111 are opposite to realize the staggered and inserted connection.

[0060] The sleeve 222 at least seals the gap between the adjacent two pole claws 2112, which can prevent the medium in the first chamber 201 from flowing to the outside through the gap between the adjacent two pole claws 2112, and is beneficial to improve the sealing performance of the first chamber 201. It can also reduce the size of the sleeve 222, for example, by eliminating the part of the sleeve 222 that overlaps the pole claw 2112 in the radial direction, which is beneficial to realize the miniaturization and light weight of the motor 100.

[0061] In addition, as shown, Figures 3-6 As shown, the claw portion 2113 is located inside the sleeve 222, which can prevent the water vapor in the outside of the motor 100 from attacking the claw portion 2113, reduce the risk of damage such as corrosion of the claw portion 2113, and prevent the performance of the pole claw assembly 21 from being damaged, which is beneficial to protect the performance of the motor 100.

[0062] In some related technologies, the pole claw is located between the stator assembly and the sleeve, and in order to prevent the external water vapor from entering between the stator assembly and the sleeve to corrode the pole claw, a sealing ring is usually added between the stator assembly and the sleeve to separate the pole claw from the outside, resulting in a bulky motor structure. In the present application, the claw portion 2113 is located inside the sleeve 222, which can prevent the external water vapor from entering between the sleeve 222 and the coil assembly 23 to corrode the claw portion 2113, and the sealing ring in the above related technology can be omitted, which is beneficial to simplify the structure of the motor 100, make the structure of the motor 100 more compact, and reduce the volume.

[0063] In the embodiment in which the pole claw assembly 21 is welded with the partition 22, the sealing connection effect of the pole claw assembly 21 and the partition 22 is better, the claw portion 2113 is less likely to be corroded by external water vapor, and the performance of the motor 100 is better protected.

[0064] In some embodiments, as shown in Figures 3-6 the sleeve 222 continuously extends along the axial direction F1 of the rotor assembly 10, and there is no through opening in the region where the sleeve 222 extends along the axial direction F1, so that the gap between the two adjacent pole claws 2112 can be more completely sealed, for example, the sleeve 222 continuously extends along the axial direction F1 and the circumferential direction to seal the pole claws 2112 and the gap between the two adjacent pole claws 2112, so that the medium in the first chamber 201 is less likely to flow to the outside, and the sealing performance of the first chamber 201 is improved.

[0065] In some embodiments of the present application, as shown in Figures 3-8 the coil assembly 23 includes a plurality of coils 231 arranged along the axial direction F1, and the pole claw groups 2111 are one-to-one corresponding to the plurality of coils 231, and the adjacent yoke portions 2114 of the two adjacent pole claw groups 2111 are connected as a whole, so that the structure compactness of the multi-coil type motor 100 is improved. The sleeve 222 is one-to-one corresponding to the plurality of pole claw groups 2111 to separate the first chamber 201 and the outside at the pole claw group 2111. The annular hole extending along the circumferential direction of the rotor assembly 10 between the adjacent sleeves 222 is a connecting hole 221, and the connecting portion 212 is sealingly connected with the connecting hole 221, so that the first chamber 201 is separated from the outside between the adjacent sleeves 222, i.e. at the yoke portion 2114, and the sealing effect of the first chamber 201 is better after the pole claw assembly 21 and the sleeve 222 are integrated.

[0066] For example, in some specific embodiments, as shown in Figures 3-6 the coil assembly 23 includes two coils 231 arranged along the axial direction F1, the pole claw groups 2111 are two and one-to-one corresponding to the two coils 231, and the sleeve 222 is two and one-to-one corresponding to the two pole claw groups 2111. The connecting hole 221 is provided between the sleeve 222 and the cover 223, and between the two adjacent sleeves 222, the pole claw assembly 21 includes three connecting portions 212, two of which are one-to-one sealingly connected with the two connecting holes 221, and the other is located at the end of the pole claw assembly 21 close to the valve seat 200 along the axial direction F1 and is sealingly connected with the sleeve 222 and the valve seat 200, and the region of the pole claw main body 211 close to the sleeve 222 and the cover 223 is sealingly connected with the sleeve 222 and the cover 223, so that the sealing effect of the first chamber 201 is better after the pole claw assembly 21, the sleeve 222 and the valve seat 200 are integrated.

[0067] In some embodiments, as shown in Figures 3-6As shown, the connecting portions 212 are multiple, the coil assembly 23 further comprises a magnetic conducting frame 232 and coils 231, the magnetic conducting frame 232 comprises multiple connecting fitting portions 2321 arranged along the axial direction F1, the multiple connecting fitting portions 2321 extend along the radial direction and are connected one by one with the multiple connecting portions 212, and the coils 231 are arranged between two adjacent connecting fitting portions 2321. The material of the magnetic conducting frame 232 can be a magnetic conducting material.

[0068] By connecting the multiple connecting portions 212 with the multiple connecting fitting portions 2321 of the magnetic conducting frame 232 one by one, the magnetic connection between the pole claw assembly 21, the magnetic conducting frame 232 and the coils 231 can be realized during the operation of the motor 100, and the magnetic connection between the stator assembly 20 and the rotor assembly 10 is realized, which is beneficial to separating the first chamber 201 from the outside while the stator assembly 20 and the rotor assembly 10 are magnetically connected, and is beneficial to ensuring the normal operation of the motor 100.

[0069] For example, in some specific embodiments, as shown in Figures 3-6 As shown, the connecting portions 212 are three, the magnetic conducting frame 232 comprises a frame main body 2322, an upper frame body 2323 and a lower frame body 2324 which are arranged along the axial direction F1 and connected, the frame main body 2322 is provided with one connecting fitting portion 2321, the radial inner ends of the upper frame body 2323 and the lower frame body 2324 are formed into connecting fitting portions 2321, so that the magnetic conducting frame 232 comprises three connecting fitting portions 2321. The three connecting fitting portions 2321 are connected one by one with the three connecting portions 212, and the connecting portion 212 connected with the connecting fitting portion 2321 of the frame main body 2322 is defined by the adjacent yoke portions 2114 which are integrated by the adjacent pole claw groups 2111 in the pole claw assembly 21, so that the rotor assembly 10, the upper pole claw group 2111, the magnetic conducting frame 232 and the upper coils 231 form one magnetic loop (as shown in the schematic diagram of the elliptical line with arrows in Figure 3 ), and the rotor assembly 10, the lower pole claw group 2111, the magnetic conducting frame 232 and the lower coils 231 form one magnetic loop (as shown in the schematic diagram of the elliptical line with arrows in Figure 3 ), which ensures the normal rotation of the rotor assembly 10 to drive the valve needle 300 to move.

[0070] In some embodiments of the present application, as shown in Figures 1-8 As shown, the motor 100 further comprises a housing 30, the housing 30 is an injection molded body and injection moldedly wraps the coil assembly 23, which is beneficial to maintaining the sealing performance of the coil assembly 23. The partition 22 is installed in the housing 30, which can separate the first chamber 201 from the coil assembly 23, reduces the risk of leakage of the medium in the first chamber 201 and even damages the coil assembly 23, and is beneficial to improving the working safety of the motor 100.

[0071] For example, in some embodiments, as shown in Figures 1-8As shown, the coil assembly 23 comprises a magnetic conducting frame 232 and a coil 231, and the magnetic conducting frame 232 and the coil 231 are integrally plasticized by the injection of the shell 30, so as to maintain the sealing effect of the coil 231.

[0072] The integrated assembly of the pole claw assembly 21 and the partition 22 can be sleeved into the coil assembly 23, for example, the integrated assembly of the pole claw assembly 21 and the partition 22 is directly sleeved into the shell 30 in which the coil assembly 23 is injection molded, and the pole claw assembly 21 is connected with the coil assembly 23, which is convenient to operate.

[0073] The other configurations and operations of the motor 100 and the electronic expansion valve 1000 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail herein.

[0074] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connecting”, “connection” should be understood in a broad sense, for example, can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the description of the present application, the description of the terms “embodiment”, “specific embodiment”, “example” and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, For an electronic expansion valve (1000), the motor (100) includes: Rotor assembly (10), the rotor assembly (10) is connected to the valve needle (300) of the electronic expansion valve (1000) to drive the valve needle (300) to move; A stator assembly (20) includes a pole claw assembly (21), a separator (22), and a coil assembly (23). The pole claw assembly (21) includes a connected pole claw body (211) and a connecting portion (212). The pole claw body (211) is located within the separator (22), which has a connecting hole (221). The connecting portion (212) passes through the connecting hole (221) and is sealed to the connecting hole (221). The connecting portion (212) is connected to the coil assembly (23). The pole claw assembly (21) and the separator (22) define a first chamber (201). The rotor assembly (10) is located within the first chamber (201). The separator (22) includes a sleeve (222) located radially outside the pole claw body (211) and a cover (223) located on one axial side of the pole claw body (211). The annular hole extending circumferentially between the sleeve (222) and the cover (223) is the connection hole (221). One axial end of the pole claw assembly (21) is sealed to the cover (223) and the other axial end is sealed to the valve seat (200) of the electronic expansion valve (1000).

2. The motor according to claim 1, characterized in that, The pole claw body (211) includes at least one pole claw group (2111), the pole claw group (2111) includes two pole claws (2112) arranged axially, each pole claw (2112) includes a plurality of claw portions (2113) arranged circumferentially and a yoke portion (2114) for connecting the plurality of claw portions (2113), the connecting portion (212) is provided on the radially outer side of the yoke portion (2114), the claw portions (2113) of the two pole claws (2112) of the same pole claw group (2111) are interlocked, and the sleeve (222) at least seals the gap between two adjacent pole claws (2112).

3. The motor according to claim 2, characterized in that, The sleeve (222) extends continuously along the axial direction of the rotor assembly (10).

4. The motor according to claim 2, characterized in that, The coil assembly (23) includes a plurality of coils (231) arranged along the axial direction. The pole claw group (2111) is a plurality of the plurality of coils (231) corresponding one-to-one. The adjacent yokes (2114) of two adjacent pole claw groups (2111) are connected as one unit. The sleeve (222) is a plurality of the plurality of pole claw groups (2111) corresponding one-to-one. The annular hole extending circumferentially between adjacent sleeves (222) along the rotor assembly (10) is the connecting hole (221).

5. The motor according to claim 2, characterized in that, The connecting part (212) is multiple, and the coil assembly (23) also includes a magnetic guide frame (232) and a coil (231). The magnetic guide frame (232) includes multiple connecting mating parts (2321) arranged along the axial direction. The multiple connecting mating parts (2321) extend radially and are connected to the multiple connecting parts (212) one by one. The coil (231) is located between two adjacent connecting mating parts (2321).

6. The motor according to claim 1, characterized in that, It also includes a housing (30), which is an injection molded body and injection molded to enclose the coil assembly (23), and the separator (22) is installed inside the housing (30).

7. The motor according to any one of claims 1-6, characterized in that, The gap between the rotor assembly (10) and the pole claw assembly (21) is less than or equal to 0.3 mm.

8. An electronic expansion valve, characterized in that, Includes the motor (100) according to any one of claims 1-7.

9. The electronic expansion valve according to claim 8, characterized in that, Also includes: A valve seat (200) and a valve needle (300) are provided. The valve seat (200) is connected to the pole claw assembly (21) and defines a second chamber (210) having an opening that communicates with the outside for the flow of a medium. The valve needle (300) is located in the second chamber (210) and is connected to the shaft (11) of the rotor assembly (10).

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