CN112865346A - AC motor capable of reducing electromagnetic sound during operation - Google Patents
AC motor capable of reducing electromagnetic sound during operation Download PDFInfo
- Publication number
- CN112865346A CN112865346A CN202110073322.9A CN202110073322A CN112865346A CN 112865346 A CN112865346 A CN 112865346A CN 202110073322 A CN202110073322 A CN 202110073322A CN 112865346 A CN112865346 A CN 112865346A
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- CN
- China
- Prior art keywords
- aerogel
- stator
- stator core
- fixing
- electromagnetic noise
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- 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
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention discloses an alternating current motor capable of reducing electromagnetic noise during operation, which comprises a stator core and a rotor core, wherein the stator core is provided with a plurality of wire grooves, the wire grooves are designed in an inclined groove manner, stator windings are correspondingly arranged on the wire grooves, fixing holes are formed in four end corners of the stator core, the upper end surface of the stator core is provided with a first aerogel gasket, the lower end surface of the stator core is provided with a second aerogel gasket, the stator core is fixed on a stator fixing plate through a fixing bolt, the rotor core is provided with a plurality of wire grooves, the wire grooves are also designed in an inclined groove manner, the wire grooves are correspondingly provided with rotor windings, and a rotating shaft penetrates through the axis of the rotor core. So as to reduce the electromagnetic sound when the motor runs at low speed.
Description
Technical Field
The present invention relates to the field of ac motors, and more particularly, to an ac motor capable of reducing electromagnetic noise during operation.
Background
The working principle of the alternating current motor is that a rotating magnetic field is formed by 180-degree phase difference of a main winding and an auxiliary winding, and then a magnetic field is generated by induced current of a rotor and interacts with a coil magnetic field to generate rotation. The low-cost speed regulation mode of the alternating current motor is divided into 2 types, one type is speed regulation through different turn ratios of a main winding and an auxiliary winding, namely the tap speed regulation which is generally said; the other is to adjust the speed by chopping the silicon controlled rectifier. The two modes have the biggest defect that electromagnetic sound is generated at low speed, the use of the two modes in the field of purifiers can seriously affect user experience, and particularly, the lower the rotating speed is, the larger the electromagnetic sound is.
Disclosure of Invention
In view of the above problems, the present invention provides an ac motor capable of reducing electromagnetic noise during operation, and mainly solves the problems in the related art.
The invention provides an alternating current motor capable of reducing electromagnetic noise during operation, which comprises a stator core and a rotor core, wherein the stator core is provided with a plurality of wire slots, the wire slots are designed in an inclined groove manner, stator windings are correspondingly arranged on the wire slots, 4 fixing holes are formed in four end corners of the stator core, the upper end surface of the stator core is provided with a first aerogel gasket, the lower end surface of the stator core is provided with a second aerogel gasket, the first aerogel gasket, the stator core and the second aerogel gasket are fixed on a stator fixing plate through fixing bolts, the rotor core is provided with a plurality of wire slots, the wire slots are also designed in an inclined groove manner, the wire slots are correspondingly provided with rotor windings, and a rotating shaft penetrates through the axis of the rotor core.
The further improvement lies in that the first aerogel gasket is made of aerogel materials, the shape of the first aerogel gasket is the same as that of the stator core, and the structure of the second aerogel gasket is the same as that of the first aerogel gasket.
The further improvement is that the thickness of the first aerogel spacer and the second aerogel spacer are both 5 mm.
The improved motor box comprises a motor box body, wherein a stator fixing plate is arranged at the bottom of the motor box body, a bolt hole is formed in the stator fixing plate, and the fixing bolt penetrates through the fixing hole and is fixed on the stator fixing plate.
The improved structure of the heat-conducting.
The improved structure is characterized in that one end of the rotating shaft is connected with an output shaft, and the other end of the rotating shaft is connected with a cooling fan.
The improved motor is characterized in that a plurality of heat conducting grooves are formed in the side face of the stator core, insulating radiating fins are inserted into the heat conducting grooves, and the other ends of the insulating radiating fins are fixed on the inner wall of the motor box body through fixing screws.
The further improvement lies in that an air gap between the rotor core and the stator core is 0.5-2 mm.
The further improvement is that the stator winding adopts double winding or sinusoidal winding.
The further improvement lies in that the wire groove is of a drop-shaped structure with inward-closed notches.
Compared with the prior art, the invention has the beneficial effects that:
the invention enables the radial force wave to generate phase shift along the axial line of the length direction of the motor through the chute design on the stator and the rotor, so that the average radial force along the axial direction is reduced, the radial deformation and the periodic vibration of the stator and the rotor are reduced, the electromagnetic sound generated when the motor runs at low speed is reduced, the electromagnetic sound generated when the stator resonates can be further absorbed through the aerogel gasket, and the influence of the electromagnetic sound on the purifier equipment is greatly reduced.
Drawings
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a portion of an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional top view of an embodiment of the present invention;
wherein: 1. a stator core; 11. a stator winding; 2. a first aerogel shim; 3. a second aerogel pad; 4. a rotor core; 41. a rotor winding; 5. a rotating shaft; 6. a fixing hole; 7. fixing the bolt; 8. bolt holes; 9. and a stator fixing plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, 2 and 3, an ac motor, which is operated to reduce electromagnetic noise, includes a stator core 1 and a rotor core 4, a plurality of wire slots are arranged on the stator core 1, the wire slots are designed in an inclined slot type, stator windings 11 are correspondingly arranged on the wire slots, four end corners of the stator core 1 are provided with 4 fixing holes 6, the upper end surface of the stator core 1 is provided with a first aerogel gasket 2, the lower end surface of the stator core 1 is provided with a second aerogel gasket 3, the first aerogel gasket 2, the stator core 1 and the second aerogel gasket 3 are fixed on a stator fixing plate 9 through a fixing bolt 7, the rotor iron core 4 is provided with a plurality of wire grooves which are also designed to be inclined grooves, the wire casing is correspondingly provided with a rotor winding 41, and the axis of the rotor core 4 is penetrated with a rotating shaft 5.
Specifically, the chute design on stator and the rotor makes radial force ripples take place phase shift along motor length direction's axis, make along the average radial force of axial reduction, it takes place radial deformation and periodic vibrations to reduce stator and rotor, nearly and reduce the electromagnetic sound when the motor low-speed operation, and all design the aerogel gasket on stator core 1's two up-and-down terminal surfaces, can adsorb the electromagnetic sound of stator in the operation through the aerogel gasket, further reduce the interference of electromagnetic sound to clarifier field equipment.
As a preferred embodiment of the present invention, the first aerogel spacer 2 is made of an aerogel material, the shape of the first aerogel spacer 2 is the same as that of the stator core 1, and the structure of the second aerogel spacer 3 is the same as that of the first aerogel spacer 2. Specifically, the laminating of aerogel gasket stator core 1's shape can ensure that the aerogel can cover by a large scale stator core 1, the reinforcing adsorbs the effect of electromagnetic sound.
In a preferred embodiment of the present invention, the thickness of each of the first aerogel spacer 2 and the second aerogel spacer 3 is 5 mm.
The motor comprises a motor case, wherein a stator fixing plate 9 is arranged at the bottom of the motor case, a bolt hole 8 is formed in the stator fixing plate 9, and the fixing bolt 7 penetrates through the fixing hole 6 and is fixed on the stator fixing plate 9.
In a preferred embodiment of the present invention, the lower end of the fixing bolt 7 is provided with an external thread, the bolt hole 8 is correspondingly provided with an internal thread, the fixing bolt 7 and the bolt hole 8 are in threaded fit connection, the aperture of the fixing hole 6 is larger than that of the bolt hole 8, and a gap between the fixing hole 6 and the fixing bolt 7 is filled with a flexible heat conducting pad.
Specifically, fixing bolt 7 fixes stator core 1 on the motor box, the vibration that produces when reducing motor operation has still increased motor operation's noise when influencing operating efficiency, and flexible heat conduction pad is one kind and has a thicker heat conduction liner, specially for utilizing the thermal design scheme production of gap transfer, can fill the gap, accomplish the heat transfer of the position of generating heat and heat dissipation position, can also play the shock attenuation simultaneously, insulating, sealed etc. effect, can satisfy equipment miniaturization, ultra-thin design requirement, can assist stator core 1 effectively to dispel the heat.
In a preferred embodiment of the present invention, one end of the rotating shaft 5 is connected to an output shaft, and the other end of the rotating shaft 5 is connected to a cooling fan.
As a preferred embodiment of the present invention, a plurality of heat conducting grooves are formed in a side surface of the stator core 1, insulating heat dissipation fins are inserted into the heat conducting grooves, and the other ends of the insulating heat dissipation fins are fixed to an inner wall of a motor case by fixing screws.
Specifically, the insulating heat sink may dissipate heat generated in the stator core 1 to an outer end of the heat sink, and take away the heat with the aid of a cooling fan, thereby achieving heat dissipation of the motor.
In a preferred embodiment of the present invention, the air gap between the rotor core 4 and the stator core 1 is 0.5 to 2 mm. Specifically, the amplitude of a harmonic magnetic field can be reduced by increasing the air gap, the radial deformation and the periodic vibration of the stator and the rotor are reduced, and the electromagnetic sound generated when the motor runs at a low speed is reduced.
As a preferred embodiment of the present invention, the stator winding 11 employs a dual winding or a sinusoidal winding to attenuate the third and fifth phase band harmonics, thereby achieving the effect of reducing noise.
As a preferred embodiment of the present invention, the wire groove is a drop-shaped structure with inward-closed notches.
Compared with the prior art, the invention has the beneficial effects that:
the invention enables the radial force wave to generate phase shift along the axial line of the length direction of the motor through the chute design on the stator and the rotor, so that the average radial force along the axial direction is reduced, the radial deformation and the periodic vibration of the stator and the rotor are reduced, the electromagnetic sound generated when the motor runs at low speed is reduced, the electromagnetic sound generated when the stator resonates can be further absorbed through the aerogel gasket, and the influence of the electromagnetic sound on the purifier equipment is greatly reduced.
In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An alternating current motor capable of reducing electromagnetic noise during operation is characterized by comprising a stator core (1) and a rotor core (4), wherein the stator core (1) is provided with a plurality of wire grooves which are designed in an oblique groove manner, stator windings (11) are correspondingly arranged on the wire grooves, 4 fixing holes (6) are formed in four end corners of the stator core (1), the upper end face of the stator core (1) is provided with a first aerogel gasket (2), the lower end face of the stator core (1) is provided with a second aerogel gasket (3), the first aerogel gasket (2), the stator core (1) and the second aerogel gasket (3) are fixed on a stator fixing plate (9) through fixing bolts (7), the rotor core (4) is provided with a plurality of wire grooves which are also designed in an oblique groove manner, the winding slot is correspondingly provided with a rotor winding (41), and a rotating shaft (5) penetrates through the axis of the rotor core (4).
2. An ac motor capable of reducing electromagnetic noise when in operation according to claim 1, wherein the first aerogel spacer (2) is made of aerogel material, and the shape of the first aerogel spacer (2) is the same as that of the stator core (1), and the structure of the second aerogel spacer (3) is the same as that of the first aerogel spacer (2).
3. An alternating current motor operable to reduce electromagnetic noise as claimed in claim 2, wherein said first aerogel spacer (2) and said second aerogel spacer (3) are both 5mm thick.
4. An alternating current motor capable of reducing electromagnetic noise during operation as claimed in claim 1, comprising a motor casing, wherein a stator fixing plate (9) is disposed at the bottom of the motor casing, a bolt hole (8) is formed in the stator fixing plate (9), and the fixing bolt (7) passes through the fixing hole (6) and is fixed on the stator fixing plate (9).
5. An AC motor with reduced electromagnetic noise when in operation according to claim 4, wherein the lower end of the fixing bolt (7) is provided with external threads, the bolt hole (8) is correspondingly provided with internal threads, the fixing bolt (7) and the bolt hole (8) are in screw fit connection, the aperture of the fixing hole (6) is larger than that of the bolt hole (8), and a gap between the fixing hole (6) and the fixing bolt (7) is filled with a flexible heat conducting pad.
6. An alternating current motor with reduced electromagnetic noise when in operation according to claim 5, wherein one end of said rotary shaft (5) is connected to an output shaft, and the other end of said rotary shaft (5) is connected to a cooling fan.
7. An alternating current motor capable of reducing electromagnetic noise when in operation as claimed in claim 1, wherein a plurality of heat conducting grooves are arranged on the side surface of the stator core (1), insulating radiating fins are inserted into the heat conducting grooves, and the other ends of the insulating radiating fins are fixed on the inner wall of the motor box body through fixing screws.
8. An alternating current motor with reduced electromagnetic noise when operated according to claim 1, wherein the air gap between said rotor core (4) and said stator core (1) is 0.5 to 2 mm.
9. An alternating current motor with reduced electromagnetic noise when in operation according to claim 1, wherein said stator winding (11) is a double winding or a sinusoidal winding.
10. An alternating current motor having reduced electromagnetic noise when in operation as claimed in claim 1 wherein said wire slot is a drop-like structure with inwardly converging slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073322.9A CN112865346B (en) | 2021-01-20 | 2021-01-20 | AC motor capable of reducing electromagnetic sound during operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073322.9A CN112865346B (en) | 2021-01-20 | 2021-01-20 | AC motor capable of reducing electromagnetic sound during operation |
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| Publication Number | Publication Date |
|---|---|
| CN112865346A true CN112865346A (en) | 2021-05-28 |
| CN112865346B CN112865346B (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110073322.9A Active CN112865346B (en) | 2021-01-20 | 2021-01-20 | AC motor capable of reducing electromagnetic sound during operation |
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Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5266859A (en) * | 1991-10-09 | 1993-11-30 | General Electric Company | Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise |
| EP1278293A2 (en) * | 2001-07-16 | 2003-01-22 | Matsushita Electric Industrial Co., Ltd. | Low-noise motor-compressor |
| GB2432056A (en) * | 2005-11-02 | 2007-05-09 | Kuen Yang Ind Co Ltd | AC motor stator having skewed stator winding grooves |
| CN101074732A (en) * | 2006-05-18 | 2007-11-21 | 丰田自动车株式会社 | Fastening structure and fastening method |
| CN101882818A (en) * | 2010-07-14 | 2010-11-10 | 中国石油集团渤海石油装备制造有限公司 | Double-layer shell screw rod drilling tool motor stator |
| CN102365806A (en) * | 2009-03-27 | 2012-02-29 | 奥的斯电梯公司 | Electric machine having multidirectional skew |
| CN206673811U (en) * | 2017-03-31 | 2017-11-24 | 深圳市德西机电有限责任公司 | Rotary transformer and brushless resovler |
| CN206918627U (en) * | 2017-06-06 | 2018-01-23 | 江苏海事职业技术学院 | A kind of damping subtracts the New Marine LNG fuel reservoirs that the system of shaking is swung |
| CN107800207A (en) * | 2016-08-31 | 2018-03-13 | 开平市永强风机实业有限公司 | A kind of runner assembly |
| CN207732520U (en) * | 2018-01-18 | 2018-08-14 | 江苏环晟电机有限公司 | A kind of stator piece improving motor assembly precision |
| CN207835179U (en) * | 2018-01-04 | 2018-09-07 | 中山大洋电机股份有限公司 | A kind of plastic packaging stator and its plastic packaging motor of application |
| WO2018202369A1 (en) * | 2017-05-03 | 2018-11-08 | Arcelik Anonim Sirketi | A compressor |
| CN208123432U (en) * | 2018-04-11 | 2018-11-20 | 东莞市速传电子材料有限公司 | A kind of high-temperature insulation type heat conductive silica gel gasket |
| CN209217862U (en) * | 2019-01-14 | 2019-08-06 | 南阳微特防爆电机有限公司 | A kind of low vibration noise abatement motor |
| CN110350686A (en) * | 2018-04-03 | 2019-10-18 | 本田技研工业株式会社 | The vibration suppression of rotating electric machine and rotating electric machine constructs |
| CN211508771U (en) * | 2020-04-21 | 2020-09-15 | 浙江海宏电器有限公司 | Sound-insulation noise-reduction shell of motor |
-
2021
- 2021-01-20 CN CN202110073322.9A patent/CN112865346B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5266859A (en) * | 1991-10-09 | 1993-11-30 | General Electric Company | Skewing of pole laminations of a switched reluctance machine to reduce acoustic noise |
| EP1278293A2 (en) * | 2001-07-16 | 2003-01-22 | Matsushita Electric Industrial Co., Ltd. | Low-noise motor-compressor |
| GB2432056A (en) * | 2005-11-02 | 2007-05-09 | Kuen Yang Ind Co Ltd | AC motor stator having skewed stator winding grooves |
| CN101074732A (en) * | 2006-05-18 | 2007-11-21 | 丰田自动车株式会社 | Fastening structure and fastening method |
| CN102365806A (en) * | 2009-03-27 | 2012-02-29 | 奥的斯电梯公司 | Electric machine having multidirectional skew |
| CN101882818A (en) * | 2010-07-14 | 2010-11-10 | 中国石油集团渤海石油装备制造有限公司 | Double-layer shell screw rod drilling tool motor stator |
| CN107800207A (en) * | 2016-08-31 | 2018-03-13 | 开平市永强风机实业有限公司 | A kind of runner assembly |
| CN206673811U (en) * | 2017-03-31 | 2017-11-24 | 深圳市德西机电有限责任公司 | Rotary transformer and brushless resovler |
| WO2018202369A1 (en) * | 2017-05-03 | 2018-11-08 | Arcelik Anonim Sirketi | A compressor |
| CN206918627U (en) * | 2017-06-06 | 2018-01-23 | 江苏海事职业技术学院 | A kind of damping subtracts the New Marine LNG fuel reservoirs that the system of shaking is swung |
| CN207835179U (en) * | 2018-01-04 | 2018-09-07 | 中山大洋电机股份有限公司 | A kind of plastic packaging stator and its plastic packaging motor of application |
| CN207732520U (en) * | 2018-01-18 | 2018-08-14 | 江苏环晟电机有限公司 | A kind of stator piece improving motor assembly precision |
| CN110350686A (en) * | 2018-04-03 | 2019-10-18 | 本田技研工业株式会社 | The vibration suppression of rotating electric machine and rotating electric machine constructs |
| CN208123432U (en) * | 2018-04-11 | 2018-11-20 | 东莞市速传电子材料有限公司 | A kind of high-temperature insulation type heat conductive silica gel gasket |
| CN209217862U (en) * | 2019-01-14 | 2019-08-06 | 南阳微特防爆电机有限公司 | A kind of low vibration noise abatement motor |
| CN211508771U (en) * | 2020-04-21 | 2020-09-15 | 浙江海宏电器有限公司 | Sound-insulation noise-reduction shell of motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112865346B (en) | 2021-11-30 |
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Address after: 518000 No. 1 Workshop, Yongxin Industrial Plant, 89 Hengping Road, Yuanshan Street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Kanghong Intelligent Health Technology Co.,Ltd. Address before: 518000 No. 1 Workshop, Yongxin Industrial Plant, 89 Hengping Road, Yuanshan Street, Longgang District, Shenzhen City, Guangdong Province Patentee before: HEALTHLEAD Corp.,Ltd. |
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