CN108292864B - External rotor motor - Google Patents
External rotor motor Download PDFInfo
- Publication number
- CN108292864B CN108292864B CN201680013443.1A CN201680013443A CN108292864B CN 108292864 B CN108292864 B CN 108292864B CN 201680013443 A CN201680013443 A CN 201680013443A CN 108292864 B CN108292864 B CN 108292864B
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- base
- external rotor
- electric machine
- outer rotor
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The utility model provides an external rotor electric machine, includes base (3), fixes stator module (2) and the rotatable external rotor subassembly (1) of detaining on stator module (2) on base (3), external rotor subassembly (1) lower limb is close to the setting with base (3), stator module (2) include iron core (5) and around establishing coil winding (4) on stator core (5), stator core (5) and coil winding (4) surface covering have sealing insulation layer, base (3) and external rotor subassembly (1) clearance department are equipped with and cover first dust-proof pad (6) on base (3) and external rotor subassembly (1) surface simultaneously. The outer rotor motor is suitable for being used underwater and in other severe environments, has a good insulation effect, is not easy to rust, can filter impurities in water, and greatly prolongs the service life of the outer rotor motor.
Description
Technical Field
The invention relates to a motor, in particular to an outer rotor motor.
Background
At present, a stator structure in an outer rotor motor comprises an end cover, a stator core, a coil winding and an insulator, wherein the coil winding is wound on the stator core, the insulator is arranged on the coil winding exposed at two ends of the stator core, the stator with the insulator is matched with the end cover in a press-fitting mode, a bearing chamber and a screw hole are machined in the end cover, the bearing chamber is used for supporting the motor to rotate, and the screw hole is used for installing and fixing a stator component. A plurality of heat dissipation holes are formed in an outer rotor component of the outer rotor motor, water and impurities can easily enter the heat dissipation holes, the outer rotor structure has various defects, and the problems that the water resistance and the impurity resistance are poor, the insulating property is poor, the rust and the dust are easily caused, and the motor bearing is easily abraded and even the motor is stuck are easily caused.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the outer rotor motor which is suitable for being used underwater or in other severe environments, has a good insulation effect, is not easy to rust, can filter impurities in water, and greatly prolongs the service life of the outer rotor motor.
In order to solve the technical problems, the invention adopts the technical scheme that the basic concept is as follows:
the outer rotor motor comprises a base, a stator assembly fixed on the base and an outer rotor assembly rotatably sleeved on the stator assembly, wherein the lower edge of the outer rotor assembly is close to the base, and a first dustproof pad which covers the surfaces of the base and the outer rotor assembly simultaneously is arranged at a gap between the base and the outer rotor assembly.
Preferably, the bottom end of the base is fixed on a mounting seat, and the first dustproof pad is arranged between the mounting seat and the base and between the mounting seat and the outer rotor assembly and covers a gap between the base and the outer rotor assembly.
Preferably, a convex screw seat is arranged on the mounting seat and abuts against the lower surface of the base, and a screw hole is formed in the center of the screw seat and is fixed on the base through a screw.
Preferably, the outer diameter of the base is not smaller than that of the outer rotor component, the lower edge of the outer rotor component is close to the circumference of the base, an annular side wall extending vertically upwards is further arranged on the outer edge of the mounting seat, and the annular side wall is higher than the lower edge of the outer rotor component.
Preferably, a second dustproof pad is arranged between the bottom surface of the mounting seat and the bottom surface of the base, the height of the second dustproof pad is slightly larger than that of the screw seat, and a through hole is correspondingly formed in the second dustproof pad.
Preferably, the first dustproof pad is arranged between the annular side wall and the outer rotor assembly and between the annular side wall and the base.
Preferably, the motor base is connected with a wire, the mounting seat and the first dustproof pad or the mounting seat and the second dustproof pad are correspondingly provided with a lead port, and the wire is led out of the motor through the lead port.
Preferably, the stator assembly comprises a stator core and a coil winding wound on the stator core, the surfaces of the stator core and the coil winding are covered with a sealing insulating layer, the coil winding is an enameled wire winding, and the exterior of the enameled wire winding is coated with a corrosion-resistant material.
Preferably, the dustproof and anti-noise motor further comprises a rotating shaft, the rotating shaft is fixedly connected with the outer rotor assembly, the rotating shaft is supported and installed on the base through a bearing, the bearing is a ceramic bearing or a nylon bearing, and the first dustproof pad is made of a flexible material.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an outer rotor motor adopting an outer rotor component, wherein the surfaces of a stator core and a coil winding of the motor are covered with a sealing insulating layer, the coil winding adopts an enameled wire winding, and the surface of the enameled wire winding is coated with a water-resistant and corrosion-resistant material, so that the motor is completely insulated and is suitable for being used in water.
2. The motor of the invention adopts the ceramic bearing and has the advantages that: the ceramic is hardly corroded, so that the ceramic rolling bearing is suitable for working in water. And secondly, as the density of the ceramic is lower than that of steel, the weight is much lighter, the centrifugal action on an outer ring during rotation can be reduced by 40 percent, and the service life is greatly prolonged. Because the elastic modulus of the ceramic is higher than that of steel, the ceramic is not easy to deform when stressed, thereby being beneficial to improving the working speed and achieving higher precision. The outer rotor motor can also adopt a nylon bearing, wherein the nylon bearing has low heat productivity and strong bearing capacity, and can improve the limit rotating speed and prolong the service life of the bearing. On the other hand, the nylon bearing has the advantages of light weight and low noise.
3. The motor can be used for working in water, so that the motor can radiate heat through water, and different from the common outer rotor component motor in which the radiating holes are formed on the outer rotor component shell, the top shell of the outer rotor component of the outer rotor motor is closed, and the radiating holes are not formed, so that impurities are prevented from entering, and the motor can be applied to water and other severe environments.
4. Each dustproof pad all has less compressive capacity, with the motor laminating, prevents inside aquatic impurity invades the motor, simultaneously, the dustproof pad of flexible material preparation can not increase too big resistance for the motor again.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is an exploded view of the structure of an outer rotor motor of the present invention;
fig. 2 is a structural view of an embodiment of an outer rotor motor of the present invention;
fig. 3 is a structural view of another embodiment of the external rotor motor of the present invention.
In the figure: 1. an outer rotor assembly; 2. A stator assembly; 3. a base; 4. a coil winding; 5. a stator core; 6. a first dust-proof pad; 7. a mounting seat; 8. a second dust-proof pad; 9. a screw seat; 10. and a bearing.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Referring to fig. 1 and 3, the external rotor electric machine of the present invention includes a base 3, a stator assembly 2 fixed on the base 3, and an external rotor assembly 1 rotatably fastened to the stator assembly 2, wherein the lower edge of the external rotor assembly 1 is disposed close to the base 3, the stator assembly 2 includes an iron core and a coil winding 4 wound on the stator iron core 5, the surfaces of the stator iron core 5 and the coil winding 4 are covered with a sealing insulating layer, and a gap between the base 3 and the external rotor assembly 1 is provided with a first dust-proof pad 6 simultaneously covering the surfaces of the base 3 and the external rotor assembly 1. Because the surfaces of the stator core 5 and the coil winding 4 of the motor are covered with the sealing insulating layers, the motor is completely insulated and suitable for being used in water, and then the first dustproof pad 6 is arranged on the structural gap of the outer rotor motor, and the first dustproof pad 6 can be foam, sponge or other flexible materials, so that impurities in water are filtered out, the internal structure of the motor is protected, for example, the bearing 10 of the motor can be prevented from being abraded by the impurities, and the service life of the motor is greatly prolonged.
Further, the bottom end of the base 3 is fixed on a mounting base 7, and the first dust-proof pad 6 is disposed between the mounting base 7 and the base 3 and the outer rotor assembly 1 and covers a gap between the base 3 and the outer rotor assembly 1. Preferably, a convex screw seat 9 is arranged on the mounting seat 7, the screw seat 9 abuts against the lower surface of the base 3, and a screw hole is formed in the center of the screw seat 9 so as to be fixed with the base 3 through a screw.
Specifically, the outer diameter of base 3 is not less than the outer diameter of external rotor subassembly 1, the department is close to the setting with 3 circumference departments of base in external rotor subassembly 1 lower limb, 7 outer fringe of mount pad still are equipped with vertical upwards extending's annular lateral wall, annular lateral wall is higher than external rotor subassembly 1 lower limb, be equipped with second dustproof pad 8 between 7 bottom surfaces of mount pad and the 3 bottom surfaces of base, second dustproof pad 8 height slightly is greater than screw seat 9 height, and corresponds sets up the through-hole. Through setting up the dustproof 8 height that highly is greater than screw seat 9 of pad of second, then the dustproof 8 pad of second has certain compressive capacity between base 3 and mount pad 7 and is favorable to filtering and leaks into the inside water of motor by screw seat 9 and 3 junctions of base, filters the impurity of aquatic and glues on dustproof pad. The first dustproof pad 6 is arranged between the annular side wall and the outer rotor component 1 and the base 3.
The motor base 3 is connected with the wire, the lead port has been seted up that mount pad 7 and first dustproof pad 6, or mount pad 7 and second dustproof pad 8 correspond, the wire passes through the motor outside is drawn forth to the lead port, 6 lead ports of first dustproof pad sticis the configuration peripheral at the wire to filter the water of permeating the motor inside by the lead port.
Preferably, the coil winding 4 is an enameled wire winding, and the exterior of the enameled wire winding is coated with a corrosion-resistant material. Thereby the corrosion resistance of enameled wire winding has been strengthened for the motor can use under other adverse circumstances.
The outer rotor motor also comprises a rotating shaft, wherein the rotating shaft is fixedly connected with the outer rotor component 1, the rotating shaft is supported and installed on the base 3 through a bearing 10, and the bearing 10 is a ceramic bearing or a nylon bearing. Since the ceramic bearing is hardly susceptible to corrosion, the ceramic rolling bearing is suitable for operation in water. And secondly, as the density of the ceramic is lower than that of steel, the weight is much lighter, the centrifugal action on an outer ring during rotation can be reduced by 40 percent, and the service life is greatly prolonged. Because the elastic modulus of the ceramic is higher than that of steel, the ceramic is not easy to deform when stressed, thereby being beneficial to improving the working speed and achieving higher precision. The outer rotor motor of the invention can also adopt a nylon bearing, wherein, the nylon bearing has low heat productivity and strong bearing capacity, and can improve the limit rotating speed and the service life of the bearing 10. On the other hand, the nylon bearing has the advantages of light weight and low noise. The outer rotor motor is not only suitable for underwater operation, but also suitable for other severer environments.
The outer rotor component of the outer rotor motor is provided with the radiating holes, and the top shell of the outer rotor component is closed without the radiating holes, so that impurities are prevented from entering.
Example two
Referring to fig. 2, an implementation structure of the external rotor electric machine of the present invention is shown, wherein the external rotor electric machine includes an external rotor assembly 1, the external rotor assembly 1 is sleeved outside a stator assembly 2, the external rotor assembly 1 is connected with a rotating shaft, the stator assembly 2 includes a stator core 5 and a coil winding 4, wherein an insulation housing is injected outside the stator core 5 and the coil winding 4 or a sealing insulation layer is coated on the surface of the stator core 5 and the coil winding 4, the insulation of the stator core 5 and the coil winding 4 from the outside is realized by injecting the insulation housing or coating the sealing insulation layer, so that the external rotor electric machine of the present invention has good insulation, is waterproof and corrosion-resistant, further, in this embodiment, the external rotor electric machine further includes a base 3, the stator assembly 2 is fixed on the base 3, the rotating shaft is supported and fixed on the base 3 through, in the embodiment, a mounting seat 7 for fixing the base 3 is further arranged at the lower edge of the outer rotor component 1 and at the bottom of the lower surface of the base 3, preferably, the mounting seat 7 is connected with the base 3 through screws, the base 3 is preferably of a circular structure and has a diameter smaller than the inner diameter of the outer rotor component 1, in order to enable the motor to have an anti-impurity effect, a first dustproof pad is further arranged between the mounting seat 7 and the base 3 and the outer rotor component 1, the first dustproof pad covers a gap between the outer rotor component 1 and the base 3 to filter water permeating into the motor from the gap, as a further optimization, a plurality of upward-protruding screw seats 9 are arranged on the mounting seat 7, the screw seats 9 abut against the lower surface of the base 3, and the screw seats 9 are provided with screw holes to be fixed on the base 3 through screws, the height of first dustproof pad slightly is greater than 9 of screw seat, and sets up the through-hole corresponding to screw seat 9, sets up first dustproof pad height to slightly be greater than 9 of screw seat height for first dustproof pad has certain compression volume, and then can play good filter effect. Preferably, first dustproof pad can be for steeping cotton, sponge or other flexible material to guarantee that there is the impurity of aquatic to be filtered, and then protected the inner structure of motor, for example can prevent the bearing 10 of impurity wearing and tearing motor, prolonged the life of motor by a wide margin. In the second embodiment, the second dustproof pad is omitted compared with the first embodiment, so that the structure is simpler.
EXAMPLE III
Referring to another implementation structure of the external rotor electric machine of the present invention shown in fig. 3, the third embodiment and the second embodiment have the same external rotor assembly 1 and stator assembly 2, except that the base 3 and the mounting seat 7 have different structures, in the third embodiment, the base 3 is a cylindrical structure or the bottom of the base 3 is a cylindrical structure, and the outer diameter of the cylindrical structure is not smaller than the outer diameter of the external rotor assembly 1, the lower edge of the external rotor assembly 1 is disposed close to the circumference of the base 3, correspondingly, the outer edge of the mounting seat 7 is provided with a vertically upward extending annular side wall which is higher than the lower edge of the external rotor assembly 1, compared with the first embodiment, the height of the annular side wall is also reduced, so that in the present embodiment, the two dustproof cushions in the embodiment 1 can be integrally disposed, that is to integrally dispose the first dustproof cushion 6 and the second dustproof cushion 8 in fig. 3, a sleeve-shaped dustproof pad is formed, wherein the side wall of the sleeve-shaped dustproof pad is arranged between the annular side wall of the mounting seat 7 and the side walls of the outer rotor component 1 and the base 3 and covers the gap between the base 3 and the outer rotor component 1. The closed bottom surface of the sleeve-shaped dustproof pad is attached to the bottom surface of the base 3, preferably, the thickness of the closed bottom surface of the sleeve-shaped dustproof pad is slightly larger than the height of the screw seat 9, and the through hole is correspondingly formed. Thereby make the confined bottom surface of cover barrel-shaped dustproof pad have certain compressive capacity in the direction of height, the confined bottom surface of cover barrel-shaped dustproof pad also has certain compressive capacity in screw seat 9 and base 3 junction periphery simultaneously to guaranteed that the place of all probably intaking of whole motor all can filter through dustproof pad, thereby protected the motor.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An external rotor motor is characterized by comprising a mounting seat, a base, a stator component fixed on the base and an external rotor component rotatably sleeved on the stator component, the lower edge of the outer rotor component is arranged close to the base, a first dustproof pad which covers the surfaces of the base and the outer rotor component simultaneously is arranged at the gap between the base and the outer rotor component, a second dustproof pad is arranged between the bottom surface of the mounting seat and the lower surface of the base, a convex screw seat is arranged on the mounting seat, the height of the second dustproof pad is slightly larger than that of the screw seat, and is correspondingly provided with a through hole, a screw seat passes through the through hole and is abutted against the lower surface of the base, the center of the screw seat is provided with a screw hole to be fixed with the base through a screw, the first dustproof pad is arranged between the mounting seat and the base and between the mounting seat and the outer rotor component and covers a gap between the base and the outer rotor component.
2. The external rotor electric machine of claim 1, wherein the outer diameter of the base is not less than the outer diameter of the external rotor assembly, the lower edge of the external rotor assembly is disposed adjacent to the circumference of the base, and the outer edge of the mounting base is further provided with an annular side wall extending vertically and upwardly, and the annular side wall is higher than the lower edge of the external rotor assembly.
3. The external rotor electric machine of claim 2, wherein the first dust-proof pad is disposed between the annular sidewall and the external rotor assembly and the base sidewall.
4. The external rotor electric machine of any one of claims 1-3, wherein the base is connected to a lead, the mounting base and the first dust-proof pad, or the mounting base and the second dust-proof pad are correspondingly provided with lead openings, and the lead is led out of the electric machine through the lead openings.
5. The external rotor electric machine of claim 4, wherein the lead openings of the first dust-proof pads are arranged around the leads.
6. The external rotor electric machine according to claim 1, wherein the stator assembly comprises a stator core and a coil winding wound on the stator core, the stator core and the coil winding are covered with a sealing insulation layer, the coil winding is an enameled wire winding, and the outside of the enameled wire winding is coated with a corrosion-resistant material.
7. The external rotor electric machine of claim 1, further comprising a rotating shaft, wherein the rotating shaft is fixedly connected with the external rotor assembly, the rotating shaft is supported and mounted on the base through a bearing, the bearing is a ceramic bearing or a nylon bearing, and the first dust-proof pad is made of a flexible material.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/096384 WO2018035716A1 (en) | 2016-08-23 | 2016-08-23 | External rotor electric machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108292864A CN108292864A (en) | 2018-07-17 |
| CN108292864B true CN108292864B (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680013443.1A Active CN108292864B (en) | 2016-08-23 | 2016-08-23 | External rotor motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108292864B (en) |
| WO (1) | WO2018035716A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422488A (en) * | 2021-07-31 | 2021-09-21 | 佛山市南海区绿智电机设备有限公司 | Direct-current outer rotor motor for electric scissors, accessories and electric scissors |
| CN114243981B (en) * | 2022-01-10 | 2023-05-12 | 卧龙电气驱动集团股份有限公司 | Permanent magnet outer rotor motor |
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| CN101615817A (en) * | 2008-06-26 | 2009-12-30 | 中山大洋电机股份有限公司 | A kind of external rotor electric machine |
| WO2010135361A1 (en) * | 2009-05-18 | 2010-11-25 | Aspen Motion Technologies, Inc. D/B/A Pentair Technical Products | Water-resistant electric motor |
| CN203285756U (en) * | 2012-11-30 | 2013-11-13 | 杭州顿力电器有限公司 | Dustproof structure of external-rotor electronic fan |
| CN204615528U (en) * | 2015-05-05 | 2015-09-02 | 杭州艾弗洛电器有限公司 | The external rotor electric machine of high-protection level |
| CN204992869U (en) * | 2015-08-19 | 2016-01-20 | 常州祥明电机有限公司 | External rotor motor |
| CN105471157A (en) * | 2015-12-31 | 2016-04-06 | 卧龙电气集团股份有限公司 | External rotor electric machine with waterproof structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201226465Y (en) * | 2008-06-26 | 2009-04-22 | 中山大洋电机股份有限公司 | External rotor motor |
| CN103821936A (en) * | 2012-11-17 | 2014-05-28 | 江苏华阳重工股份有限公司 | Sediment control device assorted with ship water-lubrication sealing device |
| CN203035950U (en) * | 2012-11-17 | 2013-07-03 | 江苏华阳重工股份有限公司 | Sand prevention device of ship water lubrication sealing device |
| CN203278409U (en) * | 2013-05-08 | 2013-11-06 | 佛山市威灵洗涤电机制造有限公司 | Motor stator and external rotor motor having the motor stator |
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2016
- 2016-08-23 CN CN201680013443.1A patent/CN108292864B/en active Active
- 2016-08-23 WO PCT/CN2016/096384 patent/WO2018035716A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615817A (en) * | 2008-06-26 | 2009-12-30 | 中山大洋电机股份有限公司 | A kind of external rotor electric machine |
| WO2010135361A1 (en) * | 2009-05-18 | 2010-11-25 | Aspen Motion Technologies, Inc. D/B/A Pentair Technical Products | Water-resistant electric motor |
| CN203285756U (en) * | 2012-11-30 | 2013-11-13 | 杭州顿力电器有限公司 | Dustproof structure of external-rotor electronic fan |
| CN204615528U (en) * | 2015-05-05 | 2015-09-02 | 杭州艾弗洛电器有限公司 | The external rotor electric machine of high-protection level |
| CN204992869U (en) * | 2015-08-19 | 2016-01-20 | 常州祥明电机有限公司 | External rotor motor |
| CN105471157A (en) * | 2015-12-31 | 2016-04-06 | 卧龙电气集团股份有限公司 | External rotor electric machine with waterproof structure |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018035716A1 (en) | 2018-03-01 |
| CN108292864A (en) | 2018-07-17 |
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Address after: 264404 Zone E, blue venture Valley, No. 40, Yangguang Road, Nanhai new area, Weihai City, Shandong Province Patentee after: Zhendi Technology Co., Ltd Address before: 100107 unit 301, unit a, No. 9, Fulin Road, Chaoyang District, Beijing Patentee before: POWERVISION TECH Inc. |
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