CN214958971U - Stator framework, magnetic suspension bearing, compressor and air conditioner - Google Patents
Stator framework, magnetic suspension bearing, compressor and air conditioner Download PDFInfo
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- CN214958971U CN214958971U CN202121385067.3U CN202121385067U CN214958971U CN 214958971 U CN214958971 U CN 214958971U CN 202121385067 U CN202121385067 U CN 202121385067U CN 214958971 U CN214958971 U CN 214958971U
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Abstract
The application provides a stator framework, a magnetic suspension bearing, a compressor and an air conditioner. This stator framework includes annular base member (1) and sets up insulating tooth portion (2) in the one end of annular base member (1), be provided with runner import (3) and first cooling runner (4) on annular base member (1), be provided with second cooling runner (5) on insulating tooth portion (2), first cooling runner (4) and runner import (3) intercommunication, first cooling runner (4) are located annular base member (1) and set up the terminal surface of insulating tooth portion (2), second cooling runner (5) and first cooling runner (4) intercommunication, second cooling runner (5) communicate to the radial inboard of insulating tooth portion (2). According to the stator framework, the stator and the rotor of the magnetic suspension bearing can be effectively cooled, and the operation reliability of the magnetic suspension bearing is improved.
Description
Technical Field
The application relates to the technical field of magnetic suspension, in particular to a stator framework, a magnetic suspension bearing, a compressor and an air conditioner.
Background
The magnetic suspension bearing is a bearing which utilizes electromagnetic force to support a rotor system to stably operate in a suspension manner. Compared with the traditional mechanical bearing, the magnetic suspension bearing has the excellent characteristics of no friction, no abrasion, no need of lubrication, high running rotating speed, long service life, low maintenance cost and the like, and has wide application prospect in the high-speed transmission fields of high-speed motors, high-speed electric spindles, high-speed flywheel energy storage systems and the like.
The magnetic suspension rotor has high running speed, and the magnetic suspension rotor can do magnetic induction line cutting motion in the electromagnetic field due to the existence of the electromagnetic field, so that large eddy current loss is generated on the rotor. In addition, the friction between the magnetic suspension rotor rotating at high speed and air also generates large wind mill loss. These losses are concentrated at the surface of the magnetically levitated rotor, which generates a large amount of heat, causing the magnetically levitated rotor to expand and deform. The deformation of the magnetic suspension rotor can destroy the dynamic balance and the structural strength of the rotor, and the rotor deformation causes the change of the structural size, which can cause the change of the air gap between the magnetic suspension stator and the rotor, so that the control parameters of the magnetic suspension bearing are changed, the instability of the rotor operation is caused, and the mechanical equipment is seriously damaged.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem that this application will be solved lies in providing a stator skeleton, magnetic suspension bearing, compressor and air conditioner, can carry out effective heat dissipation to magnetic suspension bearing's stator and rotor, improves magnetic suspension bearing operational reliability.
In order to solve the problem, the application provides a stator framework, including annular base member and the insulating tooth portion of arranging along the circumference of annular base member, insulating tooth portion is protruding towards the first end of annular base member, be provided with runner import and first cooling runner on the annular base member, be provided with the second cooling runner on the insulating tooth portion, first cooling runner and runner import intercommunication, first cooling runner is located the first terminal surface of annular base member, second cooling runner and first cooling runner intercommunication, the second cooling runner communicates to the radial inboard of insulating tooth portion.
Preferably, the annular base body is located on the radial outer side of the insulating tooth portion and connected with the insulating tooth portion, the first cooling flow channel is an annular flow channel, and the first cooling flow channel is arranged on the radial outer side of the insulating tooth portion and spaced from the insulating tooth portion.
Preferably, the height of the side walls on both sides of the first cooling flow channel is the same.
Preferably, the insulating tooth portion includes a tooth slot, and the second cooling flow channel is provided on a slot bottom wall of the insulating tooth portion.
Preferably, the groove bottom wall surface of the second cooling flow passage is coplanar with the first end face of the annular base body, and the depth of the second cooling flow passage is the same as that of the first cooling flow passage.
Preferably, the second cooling flow channel extends in a radial direction of the insulating tooth portion; and/or each insulating tooth part is provided with a second cooling flow channel.
Preferably, the number of the channel inlets is one, the number of the first cooling channels is one, the number of the second cooling channels is arranged at intervals along the circumferential direction of the insulating tooth portion, and the flow cross sections of the inlet positions of the second cooling channels are gradually increased along the circumferential direction far away from the channel inlets.
According to another aspect of the present application, there is provided a magnetic suspension bearing, comprising stator frames, at least one of which is the above-mentioned stator frame.
According to another aspect of the application, a magnetic suspension bearing is provided, which includes a stator core and a stator framework disposed on the stator core, at least one stator framework and the stator core are formed with a cooling channel at a matching position, the stator framework is provided with a channel inlet, and the channel inlet is communicated with a radial inner side space of the stator core through the cooling channel.
Preferably, the stator framework comprises an annular base body and an insulating tooth part arranged at one end of the annular base body, the annular base body is located on the radial outer side of the insulating tooth part, the annular base body is arranged corresponding to a yoke part of the stator core, the insulating tooth part is arranged corresponding to a tooth part of the stator core, the cooling flow channel comprises a first cooling flow channel located between the annular base body and the yoke part and a second cooling flow channel located between the insulating tooth part and the stator teeth of the stator core, the first cooling flow channel is communicated with the flow channel inlet, the first end of the second cooling flow channel is communicated with the first cooling flow channel, and the second end of the second cooling flow channel is communicated with the radial inner side space of the stator teeth.
Preferably, the first cooling flow channel is provided on an end face of the annular base body facing the yoke portion, and the second cooling flow channel is provided on an end face of the insulating tooth portion facing the stator teeth.
Preferably, the first cooling flow channel is an annular flow channel, the first cooling flow channel forms a radial interval with the insulating tooth part, and the wall surface of the groove bottom wall of the second cooling flow channel is coplanar with the first end face of the annular base body.
Preferably, the first cooling flow channel is provided on an end surface of the yoke portion facing the stator frame, and the second cooling flow channel is provided on an end surface of the stator tooth facing the stator frame.
According to another aspect of the present application, there is provided a compressor comprising the above-mentioned stator frame or the above-mentioned magnetic bearing.
According to another aspect of the present application, an air conditioner is provided, which comprises the above stator frame or the above magnetic suspension bearing.
The application provides a stator framework, including annular base member and the insulating tooth portion of arranging along annular base member's circumference, insulating tooth portion is protruding towards the first end of annular base member, be provided with runner import and first cooling runner on the annular base member, be provided with second cooling runner on the insulating tooth portion, first cooling runner and runner import intercommunication, first cooling runner is located the first end terminal surface of annular base member, second cooling runner and first cooling runner intercommunication, second cooling runner communicates to the radial inboard of insulating tooth portion. This stator skeleton is through setting up first cooling runner and second cooling runner, realize coolant's transport, because first cooling runner is located the terminal surface of annular base member, consequently when using with stator core cooperation, can make coolant directly contact with stator core, cool off stator core, and simultaneously, because second cooling runner communicates to the radial inboard of insulating tooth portion, consequently make coolant can reach stator and rotor clearance department through second cooling runner, cool off the rotor, thereby utilize the cooling runner on the stator skeleton to realize the cooling to stator core and rotor core simultaneously, can effectively dispel the heat to the stator and the rotor of magnetic suspension bearing, improve magnetic suspension bearing operational reliability.
Drawings
FIG. 1 is a schematic structural diagram of a stator frame according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a magnetic suspension bearing according to an embodiment of the present application;
FIG. 3 is an exploded view of a magnetic bearing according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a stator core according to an embodiment of the present application.
The reference numerals are represented as:
1. an annular base; 2. an insulating tooth portion; 3. a flow channel inlet; 4. a first cooling flow passage; 5. a second cooling flow channel; 6. a stator frame; 7. a stator core; 8. a yoke portion; 9. stator teeth; 10. a rotor assembly.
Detailed Description
With combined reference to fig. 1 to 4, according to an embodiment of the present application, the stator frame includes an annular base 1 and insulating tooth portions 2 arranged along a circumferential direction of the annular base 1, the insulating tooth portions 2 protrude toward a first end of the annular base 1, a flow channel inlet 3 and a first cooling flow channel 4 are provided on the annular base 1, a second cooling flow channel 5 is provided on the insulating tooth portions 2, the first cooling flow channel 4 is communicated with the flow channel inlet 3, the first cooling flow channel 4 is located on a first end face of the annular base 1, the second cooling flow channel 5 is communicated with the first cooling flow channel 4, and the second cooling flow channel 5 is communicated to a radial inner side of the insulating tooth portions 2.
This stator skeleton is through setting up first cooling runner 4 and second cooling runner 5, realize coolant's transport, because first cooling runner 4 is located the first end terminal surface of annular base member 1, consequently when using with stator core 7 cooperation, can make coolant directly contact with stator core 7, cool off stator core 7, simultaneously, because second cooling runner 5 communicates to the radial inboard of insulating tooth portion 2, consequently make coolant can reach stator and rotor clearance department through second cooling runner 5, cool off the rotor, thereby utilize the cooling runner on the stator skeleton to realize the cooling to stator core 7 and rotor core simultaneously, can effectively dispel the heat to the stator and the rotor of magnetic suspension bearing, improve magnetic suspension bearing operational reliability.
In this embodiment, when the stator frame is mounted on the stator core 7, since the cooling flow channel for cooling the stator core 7 and the rotor assembly 10 is already arranged on the stator frame, it is not necessary to provide the cooling flow channel on the stator core 7, and the structure of the stator core 7 is not damaged, so that the magnetic circuit of the stator core 7 can be prevented from being affected, and the working performance of the magnetic suspension bearing is ensured. In addition, compared with the cooling flow channel processed on the stator core 7, the cooling flow channel processed on the stator framework is easier to realize in process, lower in cost and higher in processing efficiency.
In one embodiment, the annular base body 1 is located radially outside the insulated tooth 2 and is connected to the insulated tooth 2, the first cooling channel 4 is an annular channel, and the first cooling channel 4 is located radially outside the insulated tooth 2 and is spaced apart from the insulated tooth 2. In the present embodiment, the annular base body 1 is located radially outside the insulating tooth portion 2, and the insulating tooth portion 2 is installed in the tooth slot of the stator core 7, so that the annular base body 1 can be installed on the end surface of the yoke portion 8 of the stator core 7 and can be attached to the yoke portion 8, and thus the first cooling flow channel 4 on the annular base body 1 forms a closed channel, so that the cooling medium can flow along the first cooling flow channel 4 in the circumferential direction of the annular base body 1, no leakage occurs, and the utilization efficiency of the cooling medium is ensured. Since the first cooling flow channel 4 is located on the first end face of the annular base body 1, that is, the end face facing the yoke portion 8, the cooling medium flows in the first cooling flow channel 4, and can carry away heat on the yoke portion 8 of the stator core 7, so as to effectively dissipate heat of the yoke portion of the stator core 7.
In one embodiment, the heights of the side walls on the two sides of the first cooling flow channel 4 are the same, so that a good fitting effect can be formed between the side walls on the two sides of the first cooling flow channel 4 and the yoke portion 8, and a sealing fit effect between the annular base body 1 and the yoke portion 8 is further ensured.
In one embodiment, the insulated teeth 2 comprise tooth slots, and the second cooling flow channels 5 are provided on the slot bottom walls of the insulated teeth 2. When the insulating tooth part 2 is installed in the tooth socket, the stator teeth 9 of the stator core 7 are also installed in the tooth socket of the insulating tooth part 2, the bottom wall of the groove of the insulating tooth part 2 is a wall surface opposite to the tooth end surface of the stator teeth 9, and the second cooling flow channel 5 is arranged on the bottom wall of the groove of the insulating tooth part 2, so that the second cooling flow channel 5 is positioned between the insulating tooth part 2 and the stator teeth 9, and therefore when a cooling medium flows through the second cooling flow channel 5 from the first cooling flow channel 4, the stator teeth 9 can be cooled more effectively, and the overall cooling effect of the cooling medium on the stator core 7 is further improved.
In one embodiment, the wall surface of the bottom wall of the second cooling flow channel 5 is coplanar with the first end surface of the annular base body 1, and the depth of the second cooling flow channel 5 is the same as that of the first cooling flow channel 4, so that the heights of the annular base body 1 and the end surface of the insulating tooth part 2 facing the yoke part 8 can be consistent, and good sealing can be formed between the annular base body and the end surface of the stator tooth part 8 of the stator core 7 and the stator teeth 9.
In one embodiment, the second cooling flow channel 5 extends along the radial direction of the insulating tooth part 2, the second cooling flow channel 5 is a through groove and extends along the radial direction to the end of the tooth part of the insulating framework, a channel structure with good sealing performance is formed between the second cooling flow channel and the tooth end face of the stator tooth 9 of the stator core 7, and a hidden blade cooling medium can be vertically sprayed to the surface of the bearing rotor assembly 10 along the radial direction while cooling the stator tooth 9, so that the rotor assembly 10 is cooled, and the operation reliability of the magnetic suspension bearing is improved.
In one embodiment, each of the insulating teeth 2 is provided with a second cooling flow passage 5, and each of the second cooling flow passages 5 is communicated with the annular first cooling flow passage 4, so that a cooling medium can be conveyed to each of the second cooling flow passages 5 through the first cooling flow passage 4, and the rotor assembly 10 can be cooled more comprehensively.
In one embodiment, a plurality of second cooling flow channels 5 may also be provided uniformly in the circumferential direction, the number of second cooling flow channels 5 being less than the number of insulated teeth 2.
In one embodiment, the number of the channel inlets 3 is one, the number of the first cooling channels 4 is one, the second cooling channels 5 are arranged at intervals along the circumferential direction of the insulating tooth portion 2, and the flow cross sections of the inlet positions of the second cooling channels 5 are increased along the circumferential direction far away from the channel inlets 3. In the present embodiment, since the farther from the flow channel inlet 3, the greater the airflow resistance, the greater the flow loss, so that the airflow rate distributed to each of the second cooling flow channels 5 can be made uniform by the above definition, and the cooling uniformity of the rotor assembly 10 can be improved.
The flow cross section of the inlet position of the second cooling channel 5 is increased gradually, and the width of the second cooling channel can be increased gradually, the depth of the second cooling channel can be increased gradually, and the span and the depth of the second cooling channel can be increased simultaneously.
The first cooling flow passage 4 is, for example, an annular groove.
The second cooling flow channel 5 may be, for example, a straight groove, an arc groove, or a diversion groove with another shape.
In one embodiment, the number of the flow channel inlets 3 may be two or more, and may be uniformly distributed along the circumferential direction of the annular base 1.
Referring to fig. 1 to 4 in combination, according to an embodiment of the present application, the magnetic suspension bearing includes stator frames 6, and at least one stator frame 6 is the above-mentioned stator frame.
In one embodiment, the stator core 7 is provided with the above-described stator frame 6 at one end and a common stator frame at the other end.
In one embodiment, the stator bobbins 6 described above are respectively provided at both ends of the stator core 7.
In one embodiment, the magnetic suspension bearing comprises a stator core 7, a stator framework 6, a bearing coil and a rotor assembly 10, wherein the stator core 7 is of an annular tooth space structure, a plurality of stator teeth 9 and stator slots are distributed in a staggered mode along the circumference, the stator framework 6 is an injection molding piece similar to the stator core 7 in structure and is provided with a plurality of tooth space insulators corresponding to the stator slots of the stator core 7, the stator framework 6 is sleeved outside the end face of the stator core 7 and can completely wrap the stator slots of the stator core 7 to form an insulating layer between the bearing coil and the stator core 7; the bearing coil passes stator skeleton 6 and stator core 7's notch, and the coiling lets in controllable electric current on the tooth's socket is insulating in the bearing coil, can provide controllable magnetic attraction for radial magnetic suspension bearing, acts on rotor subassembly 10, realizes rotor subassembly 10's suspension control.
Referring to fig. 1 to 4 in combination, according to an embodiment of the present application, a magnetic suspension bearing includes a stator core 7 and stator frames 6 disposed on the stator core 7, at least one of the stator frames 6 and the stator core 7 is formed with a cooling channel at a matching position, the stator frame 6 is provided with a channel inlet 3, and the channel inlet 3 is communicated with a radially inner space of the stator core 7 through the cooling channel.
In this embodiment, the cooling medium enters the cooling flow channel through the flow channel inlet 3, and in the process of flowing along the cooling flow channel, the cooling medium can flow through the matching end surfaces of the stator frame 6 and the stator core 7 to cool the stator core 7, and finally enters the radial inner space of the stator core 7 through the cooling flow channel to cool the rotor assembly 10 on the radial inner side of the stator core 7. Through the cooling flow channel, the stator core 7 and the rotor assembly 10 can be cooled simultaneously, so that a good cooling effect can be provided for the magnetic suspension bearing, and the operation reliability of the magnetic suspension bearing is improved.
In one embodiment, the stator frame 6 includes an annular base 1 and an insulating tooth portion 2 disposed at one end of the annular base 1, the annular base 1 is located radially outside the insulating tooth portion 2, the annular base 1 is disposed corresponding to a yoke portion 8 of a stator core 7, the insulating tooth portion 2 is disposed corresponding to a tooth portion of the stator core 7, the cooling flow path includes a first cooling flow path 4 located between the annular base 1 and the yoke portion 8, and a second cooling flow path 5 located between the insulating tooth portion 2 and a stator tooth 9 of the stator core 7, the first cooling flow path 4 is communicated with the flow path inlet 3, a first end of the second cooling flow path 5 is communicated with the first cooling flow path 4, and a second end of the second cooling flow path 5 is communicated with a radially inner space of the stator tooth 9.
In one embodiment, the first cooling flow channel 4 is arranged on the end face of the annular base body 1 facing the yoke 8 and the second cooling flow channel 5 is arranged on the end face of the insulated tooth section 2 facing the stator teeth 9. In the present embodiment, the first cooling flow passage 4 and the second cooling flow passage 5 are both provided on the stator frame 6.
In one embodiment, the first cooling flow passage 4 is an annular flow passage, the first cooling flow passage 4 is radially spaced from the insulated tooth portion 2, and the groove bottom wall surface of the second cooling flow passage 5 is coplanar with the first end surface of the annular base body 1.
In one embodiment, the first cooling flow channel 4 is provided on an end surface of the yoke portion 8 facing the stator frame 6, and the second cooling flow channel 5 is provided on an end surface of the stator teeth 9 facing the stator frame 6. In the present embodiment, the first cooling flow channel 4 and the second cooling flow channel 5 are both provided on the stator core 7.
According to an embodiment of the application, the compressor comprises the above-mentioned stator frame or the above-mentioned magnetic bearing.
According to an embodiment of the present application, the air conditioner includes the above-described stator frame or the above-described magnetic bearing.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (15)
1. The stator framework is characterized by comprising an annular base body (1) and insulating tooth parts (2) distributed along the circumferential direction of the annular base body (1), wherein the insulating tooth parts (2) protrude towards the first end of the annular base body (1), a runner inlet (3) and a first cooling runner (4) are arranged on the annular base body (1), a second cooling runner (5) is arranged on the insulating tooth parts (2), the first cooling runner (4) is communicated with the runner inlet (3), the first cooling runner (4) is located on the end face of the first end of the annular base body (1), the second cooling runner (5) is communicated with the first cooling runner (4), and the second cooling runner (5) is communicated to the inner side in the radial direction of the insulating tooth parts (2).
2. The stator skeleton according to claim 1, characterized in that the annular base body (1) is located radially outside the insulated teeth (2) and connected to the insulated teeth (2), the first cooling flow channel (4) is an annular flow channel, and the first cooling flow channel (4) is arranged radially outside the insulated teeth (2) and spaced from the insulated teeth (2).
3. Stator skeleton according to claim 2, characterized in that the side walls on both sides of the first cooling flow channel (4) are of the same height.
4. Stator skeleton according to claim 1, characterized in that the insulating teeth (2) comprise tooth slots, and the second cooling flow channels (5) are provided on the groove bottom walls of the insulating teeth (2).
5. The stator frame as claimed in claim 4, characterized in that the groove bottom wall surface of the second cooling flow channel (5) is coplanar with the first end face of the annular base body (1), and the depth of the second cooling flow channel (5) is the same as the depth of the first cooling flow channel (4).
6. Stator skeleton according to claim 1, characterized in that the second cooling flow channel (5) extends in the radial direction of the insulating tooth (2); and/or each insulating tooth part (2) is provided with the second cooling flow channel (5).
7. Stator skeleton according to claim 2, characterized in that the flow channel inlet (3) is one, the first cooling flow channel (4) is one, and the second cooling flow channels (5) are arranged at intervals along the circumference of the insulating tooth part (2), and the flow cross-section increases at the inlet position of the second cooling flow channel (5) along the circumferential direction away from the flow channel inlet (3).
8. Magnetic bearing comprising a stator frame (6), characterized in that at least one of the stator frames (6) is a stator frame according to any of claims 1 to 7.
9. The magnetic suspension bearing is characterized by comprising a stator core (7) and a stator framework (6) arranged on the stator core (7), wherein a cooling channel is formed at the matching position of the stator framework (6) and the stator core (7), a channel inlet (3) is formed in the stator framework (6), and the channel inlet (3) is communicated with the radial inner side space of the stator core (7) through the cooling channel.
10. Magnetic bearing according to claim 9, characterized in that the stator frame (6) comprises an annular base body (1) and an insulating tooth (2) arranged at one end of the annular base body (1), the annular base body (1) being located radially outside the insulating tooth (2), the annular base body (1) being arranged in correspondence with a yoke portion (8) of the stator core (7), the insulating tooth (2) being arranged in correspondence with a tooth portion of the stator core (7), the cooling flow channel comprising a first cooling flow channel (4) between the annular base body (1) and the yoke portion (8), and a second cooling flow channel (5) between the insulating tooth (2) and a stator tooth (9) of the stator core (7), the first cooling flow channel (4) being in communication with the flow channel inlet (3), the first end of the second cooling flow channel (5) is communicated with the first cooling flow channel (4), and the second end of the second cooling flow channel (5) is communicated with the radial inner side space of the stator teeth (9).
11. Magnetic bearing according to claim 10, characterized in that the first cooling flow channel (4) is arranged on the end face of the annular base body (1) facing the yoke (8) and the second cooling flow channel (5) is arranged on the end face of the insulated tooth section (2) facing the stator teeth (9).
12. Magnetic bearing according to claim 11, characterized in that the first cooling channel (4) is an annular channel, the first cooling channel (4) is radially spaced from the insulation tooth (2), and the groove bottom wall surface of the second cooling channel (5) is coplanar with the first end face of the annular base body (1).
13. Magnetic bearing according to claim 10, characterized in that the first cooling flow channel (4) is arranged on the end face of the yoke part (8) facing the stator frame (6) and the second cooling flow channel (5) is arranged on the end face of the stator tooth (9) facing the stator frame (6).
14. A compressor, characterized by comprising a stator frame according to any one of claims 1 to 7 or a magnetic bearing according to any one of claims 8 to 13.
15. An air conditioner, characterized in that it comprises a stator frame as claimed in any one of claims 1 to 7 or a magnetic suspension bearing as claimed in any one of claims 8 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121385067.3U CN214958971U (en) | 2021-06-21 | 2021-06-21 | Stator framework, magnetic suspension bearing, compressor and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121385067.3U CN214958971U (en) | 2021-06-21 | 2021-06-21 | Stator framework, magnetic suspension bearing, compressor and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214958971U true CN214958971U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121385067.3U Active CN214958971U (en) | 2021-06-21 | 2021-06-21 | Stator framework, magnetic suspension bearing, compressor and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214958971U (en) |
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2021
- 2021-06-21 CN CN202121385067.3U patent/CN214958971U/en active Active
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