CN106953467A - Electromotor cooling system - Google Patents
Electromotor cooling system Download PDFInfo
- Publication number
- CN106953467A CN106953467A CN201710227044.1A CN201710227044A CN106953467A CN 106953467 A CN106953467 A CN 106953467A CN 201710227044 A CN201710227044 A CN 201710227044A CN 106953467 A CN106953467 A CN 106953467A
- Authority
- CN
- China
- Prior art keywords
- cooling duct
- casing
- cooling
- motor
- cooling system
- Prior art date
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- 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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- 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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention belongs to machine field, a kind of electromotor cooling system is specifically provided.Present invention seek to address that the problem of cooling system structure of existing motor is complicated.For this purpose, the electromotor cooling system of the present invention includes：The first cooling duct and the second cooling duct that are arranged on the casing of motor, the 3rd cooling duct being arranged in the rotating shaft of motor and the communicating passage being arranged on the end of motor, and the first cooling duct can be connected with the second cooling duct by communicating passage with third channel, and then coolant can be circulated in the casing of motor and in rotating shaft successively, so as to take away the heat that stator and rotor are produced in motor operation course.Therefore, electromotor cooling system of the invention also significantly reduces the complexity of electromotor cooling system while the cooling effectiveness of motor is ensured.
Description
Technical field
The invention belongs to machine field, a kind of electromotor cooling system is specifically provided.
Background technology
With the continuous progress of science and technology, the motor of high power and high torque density is more and more applied.But
There is higher temperature rise in the motor of high power and high torque density, so that performance, efficiency to motor operation in use
And life and reliability causes serious influence.In order to reduce the temperature rise of motor, it usually needs to the stator of motor and turn
Son is cooled down, for example, set cooling duct respectively on the stator (such as casing) and rotor (such as rotating shaft) of motor and external respectively
Cooling tube so that coolant can be circulated in the presence of cooling pump in the cooling duct on casing and rotating shaft, so that
The amount of heat produced in motor operation course is taken away, motor is reached the effect of cooling.
But, the motor of external cooling tube is distinguished on casing and rotating shaft needs more parts and longer runner to cause
Make the structure of electromotor cooling system more complicated.
Correspondingly, this area needs a kind of new electromotor cooling system to solve the above problems.
The content of the invention
It has been that the cooling system structure of the existing motor of solution complicated is asked to solve above mentioned problem of the prior art
Topic, the invention provides a kind of electromotor cooling system, the motor includes casing, end cap, stator, rotor and rotating shaft, the machine
First mouth of a river and second mouth of a river are provided with shell, the cooling system includes：The first cooling duct on the housing is set,
One end of first cooling duct can be connected with first mouth of a river；Set the second cooling on the housing logical
Road, one end of second cooling duct can be connected with second mouth of a river；3rd cooling duct, it is arranged at described turn
In axle；And communicating passage, it is arranged at the end of the motor, and the communicating passage is used for first cooling duct
The other end is connected with one end of the 3rd cooling duct, by the other end of second cooling duct and the described 3rd cooling
The other end of passage is connected.
In the optimal technical scheme of above-mentioned electromotor cooling system, the cooling system also includes connectedness, the connection
Part is arranged at the end of the motor, and the communicating passage is arranged in the connectedness.
In the optimal technical scheme of above-mentioned electromotor cooling system, the connectedness is current divider.
In the optimal technical scheme of above-mentioned electromotor cooling system, the 3rd cooling duct includes：It is arranged at described turn
Shaft hole in axle；And it is arranged at rotor water pipe in the shaft hole, being connected with the shaft hole；Wherein, described turn
The end of the motor is fixed in one end of sub- water pipe.
In the optimal technical scheme of above-mentioned electromotor cooling system, the communicating passage includes the first communicating passage and second
Communicating passage, wherein, first communicating passage is used to connect first cooling duct and the shaft hole, and described second connects
Circulation passage is used to connect the rotor water pipe and second cooling duct.
It is relative with first mouth of a river and second mouth of a river in the optimal technical scheme of above-mentioned electromotor cooling system
Should, be provided with the first water pipe and the second water pipe on the motor, first water pipe by first mouth of a river only with it is described
First cooling duct is connected, and second water pipe is only connected by second mouth of a river with second cooling duct.
In the optimal technical scheme of above-mentioned electromotor cooling system, the casing includes the first casing and the second casing, institute
The first cooling duct and second cooling duct is stated to be separately positioned in first casing and second casing.
In the optimal technical scheme of above-mentioned electromotor cooling system, the casing includes the first casing and the second casing, institute
State and dividing plate is provided between the first casing and second casing, first cooling duct and second cooling duct difference
It is arranged on first casing and second casing.
In the optimal technical scheme of above-mentioned electromotor cooling system, first cooling duct is in along the axis direction of motor
Screw type or S types, axis direction of second cooling duct along motor helically type or S types.
In the optimal technical scheme of above-mentioned electromotor cooling system, first cooling duct and second cooling duct
And the 3rd cooling duct pass through the communicating passage formation series connection cooling duct.
It will be appreciated to those of skill in the art that in the preferred technical solution of the present invention, passing through the casing in motor
The second cooling duct that the first cooling duct and one end that upper setting one end is connected with first mouth of a river are connected with second mouth of a river, in electricity
In the rotating shaft of machine set the 3rd cooling duct, and motor end set communicating passage so that the first cooling duct it is another
One end can be connected with the other end of the second cooling duct by communicating passage with third channel, and then coolant can exist successively
It is circulated in the casing of motor and in rotating shaft, so as to take away the heat that stator and rotor are produced in motor operation course.
Therefore, electromotor cooling system of the invention only needs two external water pipes to connect first mouth of a river and second mouth of a river respectively, just can make electricity
The casing and rotor of machine are all passed through coolant, so as to simplify the structure of electromotor cooling system relative to prior art, reduce
The complexity of motor, has saved cost.Further, the first cooling duct and the second cooling duct by being arranged on casing
Coolant is enabled to carry out secondary cooling to casing, so as to improve the cooling effectiveness of motor relative to prior art.
Brief description of the drawings
Fig. 1 is the effect diagram of the electromotor cooling system of the present invention；
Fig. 2 is the sectional view of the first embodiment of the electromotor cooling system of the present invention；
Fig. 3 is the sectional view of the second embodiment of the electromotor cooling system of the present invention；.
Reference numerals list：
1st, casing；11st, inner casing；111st, the first cooling duct；12nd, outer cage；121st, the second cooling duct；13rd, first
Water pipe；14th, the second water pipe；2nd, rotating shaft；21st, the 3rd cooling duct；211st, annular chamber；212nd, inner chamber；3rd, current divider；31st, first
Tie-beam；311st, the first communicating passage；32nd, the second tie-beam；321st, the second communicating passage.
Embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining the know-why of the present invention, are not intended to limit protection scope of the present invention.For example, although
It is relation drafting by a certain percentage between each part in accompanying drawing, but this proportionate relationship is not unalterable, this area
Technical staff can make adjustment to it as needed, to adapt to specific application scenario, and the technical scheme after adjustment will
Fall into protection scope of the present invention.
It should be noted that in the description of the invention, term " on ", " under ", "left", "right", " interior ", " outer " etc. are indicated
Direction or position relationship term be based on direction shown in the drawings or position relationship, this is intended merely to facilitate description, and
It is not instruction or implies that described device or element there must be specific orientation, with specific azimuth configuration and operation, therefore not
It is understood that as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " are only used for describing purpose, without being understood that
To indicate or implying relative importance.
In addition it is also necessary to explanation, in the description of the invention, unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.To those skilled in the art, it can understand that above-mentioned term exists as the case may be
Concrete meaning in the present invention.
As depicted in figs. 1 and 2, as the first embodiment of the present invention, electromotor cooling system mainly includes machine in structure
Shell 1, stator (not indicated in figure), rotor (not indicated in figure), rotating shaft 2 and the current divider 3 positioned at motor end.Wherein, casing 1
Including the inner casing 11 as the first casing and the outer cage 12 as the second casing, and inner casing 11 is internally provided with
One cooling duct 111, outer cage 12 is internally provided with the second cooling duct 121.Preferably, the first cooling duct 111 and
Two cooling ducts 121 are all along the cooling duct of axis direction helically type or the S types of motor, to increase casing 1 and cooling
The contact area of liquid, improves the radiating efficiency of motor.Further, the left end of the first cooling duct 111 shown in Fig. 2 is by setting
First mouth of a river (not indicated in figure) on casing 1 is connected with the first water pipe 13, the second cooling duct 111 shown in Fig. 2
Left end is connected by second mouth of a river (not indicated in figure) being arranged on casing 1 with the second water pipe 14.
It will be appreciated to those of skill in the art that be inner casing 11 and outer cage 12 by the split of casing 1, and in interior machine
First cooling duct 111 and the second cooling duct 121 are set respectively on shell 11 and outer cage 12, processing, the system of casing 1 can be facilitated
Make and repair.
With continued reference to Fig. 2, the 3rd cooling duct 21 is provided with rotating shaft 2.Specifically, shaft hole (figure is provided with rotating shaft 2
In do not indicate), for accommodating rotor water pipe (not indicated in figure), and the rotor water pipe is fixedly connected with the end of motor.
Annular chamber 211 is formed between the inwall of shaft hole and the outer wall of rotor water pipe, the inner chamber of the annular chamber 211 and rotor water pipe
212 are collectively forming the 3rd cooling duct 21, coolant is flowed to inner chamber 212 out of annular chamber 211 or is flowed from inner chamber 212
To annular chamber 211, and then heat of the coolant of flowing rapidly by rotating shaft 2 is set to take away.In addition, those skilled in the art
The 3rd cooling duct 21 can also be arranged to the structure of other shapes as needed, annular chamber 211 for example is arranged into edge turns
The structure of the axis of axle 2 helically type.
Fig. 2 is further regarded to, current divider 3 is preferably removable installed in the end of motor by bolt (not shown)
Portion, in order to the processing, manufacture and maintenance of motor and current divider 3, or those skilled in the art can also be as needed, passes through
Current divider 3 is fixedly connected by other connected modes with the end of motor, for example, weld, and those skilled in the art can be with addition
The end of current divider 3 and motor is integrally molded so as an entirety.Further, current divider 3 includes the first tie-beam 31 and second
It is provided with tie-beam 32, and the first tie-beam 31 in first communicating passage 311, the second cooling beam 32 and is provided with the second connection
Passage 321.First communicating passage 311 is used to connect the first cooling duct 111 and the 3rd cooling duct 21 (such as annular chamber 211),
Second communicating passage 321 is used to connect the second cooling duct 121 and the 3rd cooling duct 21 (such as inner chamber 212) so that first is cold
But passage 111, the first communicating passage 311, the 3rd cooling duct 21, the second communicating passage 321 and the second cooling duct 121 be successively
Connect as the cooling duct of an entirety, and then enable coolant to enter the first cooling duct 111 from the first water pipe 13, most
Flowed out by the second cooling duct 121 from the second water pipe 14.
It will be appreciated to those of skill in the art that relative in the prior art by external pipeline by motor case
Cooling duct is connected with the cooling duct in rotating shaft, in a preferred embodiment of the invention, the first communicating passage 311 and
Not only runner is short for two communicating passages 321, and by adjusting the sectional area of the first communicating passage 311 and the second communicating passage 321
Resistance when coolant flows through current divider can also be efficiently reduced.
In addition, in addition to the current divider 3 shown in Fig. 1 and Fig. 2, those skilled in the art can also select other as needed
Annular chamber 211 of the connectedness of form by the first cooling duct 111 and the second cooling duct 121 respectively with the 3rd cooling duct 21
It is connected with inner chamber 212, for example, the connectedness is the pipeline being relatively large in diameter.It will be appreciated by persons skilled in the art that connection
The passage of first cooling duct 111 and annular chamber 211 is with connecting the passage of the second cooling duct 121 and inner chamber 212 quantitatively
Both can be one or a plurality of, such as two, three, five.
As shown in figure 3, as the second embodiment of the present invention, dividing plate 15 is added on the basis of first embodiment.Tool
Body, dividing plate 15 is arranged between inner casing 11 and outer cage 12, it is logical for separating the first cooling duct 111 and the second cooling
Road 121.More specifically, the first groove (not shown) can be provided with the outer wall of inner casing 11, in outer cage 12
The second groove (not shown) is provided with inwall so that in the assembled state, the first groove can be with dividing plate for casing 1
The first cooling duct 111 is formed between 15, the second cooling duct 121 is formed between the second groove and dividing plate 15, so as to facilitate
Processing, manufacture and the maintenance of casing 1.Further, on dividing plate 15 with the first water pipe 13 and the corresponding position of the second water pipe 14
It is respectively arranged with intercommunicating pore (not indicated in figure) so that the left end of the first cooling duct 111 shown in Fig. 2 and the phase of the first water pipe 13
Connection, the left end of the second cooling duct 111 is connected with the second water pipe 14 shown in Fig. 2.
It will be appreciated to those of skill in the art that the said structure of inner casing 11 and outer cage 12, can optimize first
The processing and manufacturing process of the cooling duct 121 of cooling duct 111 and second, replaces extrusion process, simultaneously for example with turning process
It is easy to remove and repair when the first cooling duct 111 and the second cooling duct 121 are damaged with leak.It should be noted that
In order to prevent that casing 1 from occurring drainage in the assembled state, between the two ends of dividing plate 15 and inner casing 11, outer cage 12
It is additionally provided with sealing ring.
In addition, although it is not shown in the figure, as the third embodiment of the present invention, being gone on the basis of second embodiment
Fall dividing plate 15, in the state of casing 1 is assembled, enable to form the first cooling between the first groove and the inwall of outer cage 12
The 3rd cooling duct 21 is formed between the outer wall of passage 111, the second groove and inner casing 11, so as to simplify the assembling of casing 1
Process.Or, those skilled in the art can also make as needed dividing plate 15 and inner casing 11, the integrally casting of outer cage 12 into
Type.
In first, second, and third embodiment of the present invention, electromotor cooling system mainly includes being used to cool down motor
The first cooling duct 111 and the second cooling duct 121 of stator and casing 1, the 3rd cooling for cooling down rotor and rotating shaft 2 are logical
Road 21 and the communicating passage for the 3rd cooling duct 21 and the first cooling duct 111, the second cooling duct 121 to be respectively communicated with
(not shown).Specifically, the communicating passage includes the first communicating passage 311 and the second communicating passage 321, wherein, first
Communicating passage 311 is used to connecting the first cooling duct 111 and the 3rd cooling duct 21, and the second communicating passage 321 is used to connecting the
Two cooling ducts 121 and the 3rd cooling duct 21.So that, coolant can enter the first cooling duct 111 from the first water pipe 13,
Then through the first communicating passage 311, annular chamber 211, inner chamber 212, the second communicating passage 321 and the second cooling duct 121 from
Two water pipes 14 flow out.
In a preferred embodiment of the invention, coolant is water, or those skilled in the art can also be as needed
Coolant, such as hydraulic oil are used as from other media.
It will be appreciated to those of skill in the art that by the first tie-beam 31 and the second tie-beam 32 by casing 1
Cooling duct (111,121) is connected with the 3rd cooling duct 21 in rotating shaft 2, make motor need to only set a water inlet pipe and
One outlet pipe (the first water pipe 13 and the second water pipe 14) is it is ensured that casing 1 and rotating shaft 2 can be simultaneously cooled, so that relatively
Complexity is reduced in electromotor cooling system of the prior art (set of cooling-part).Meanwhile, by being arranged on casing 1
On the first cooling duct 111 and the second cooling duct 121 enable coolant to casing 1 carry out secondary cooling so that phase
The cooling effectiveness of motor is improved for prior art.
So far, combined preferred embodiment shown in the drawings describes technical scheme, still, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (10)
1. a kind of electromotor cooling system, the motor includes being provided with casing, end cap, stator, rotor and rotating shaft, the casing
First mouth of a river and second mouth of a river, it is characterised in that the cooling system includes：
The first cooling duct on the housing is set, and one end of first cooling duct can be with first mouth of a river phase
Connection；
The second cooling duct on the housing is set, and one end of second cooling duct can be with second mouth of a river phase
Connection；
3rd cooling duct, it is arranged in the rotating shaft；And
Communicating passage, it is arranged at the end of the motor, and the communicating passage is used for the another of first cooling duct
End is connected with one end of the 3rd cooling duct, by the other end of second cooling duct and the 3rd cooling duct
The other end be connected.
2. electromotor cooling system according to claim 1, it is characterised in that the cooling system also includes connectedness, institute
The end that connectedness is arranged at the motor is stated, the communicating passage is arranged in the connectedness.
3. electromotor cooling system according to claim 2, it is characterised in that the connectedness is current divider.
4. electromotor cooling system according to claim 1, it is characterised in that the 3rd cooling duct includes：
It is arranged at the shaft hole in the rotating shaft；And
It is arranged at rotor water pipe in the shaft hole, being connected with the shaft hole；
Wherein, the end of the motor is fixed in one end of the rotor water pipe.
5. electromotor cooling system according to claim 4, it is characterised in that the communicating passage includes the first communicating passage
With the second communicating passage,
Wherein, first communicating passage is used to connect first cooling duct and the shaft hole, and second connection is logical
Road is used to connect the rotor water pipe and second cooling duct.
6. electromotor cooling system according to claim 5, it is characterised in that with first mouth of a river and second mouth of a river
It is corresponding, be provided with the first water pipe and the second water pipe on the motor, first water pipe by first mouth of a river only with
The first cooling duct connection, second water pipe is only connected by second mouth of a river with second cooling duct.
7. electromotor cooling system according to any one of claim 1 to 6, it is characterised in that the casing includes first
Casing and the second casing, first cooling duct and second cooling duct are separately positioned on first casing and described
In second casing.
8. electromotor cooling system according to any one of claim 1 to 6, it is characterised in that the casing includes first
Casing and the second casing, are provided with dividing plate, first cooling duct and institute between first casing and second casing
The second cooling duct is stated to be separately positioned on first casing and second casing.
9. electromotor cooling system according to any one of claim 1 to 6, it is characterised in that first cooling duct
Along axis direction helically type or the S types of motor, axis direction of second cooling duct along motor helically type or S types.
10. electromotor cooling system according to any one of claim 1 to 6, it is characterised in that first cooling duct
The cooling duct for passing through communicating passage formation series connection with second cooling duct and the 3rd cooling duct.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710227044.1A CN106953467A (en) | 2017-04-07 | 2017-04-07 | Electromotor cooling system |
| PCT/CN2017/095223 WO2018184327A1 (en) | 2017-04-07 | 2017-07-31 | Motor cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710227044.1A CN106953467A (en) | 2017-04-07 | 2017-04-07 | Electromotor cooling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106953467A true CN106953467A (en) | 2017-07-14 |
Family
ID=59474274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710227044.1A Pending CN106953467A (en) | 2017-04-07 | 2017-04-07 | Electromotor cooling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106953467A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018184328A1 (en) * | 2017-04-07 | 2018-10-11 | 上海蔚来汽车有限公司 | Motor cooling system |
| WO2018184327A1 (en) * | 2017-04-07 | 2018-10-11 | 上海蔚来汽车有限公司 | Motor cooling system |
| CN110277842A (en) * | 2018-03-15 | 2019-09-24 | 蔚来汽车有限公司 | Motor with cooling jacket |
| CN113991916A (en) * | 2021-11-04 | 2022-01-28 | 珠海格力电器股份有限公司 | Motor casing, motor, air compressor machine system and domestic appliance |
| CN114271962A (en) * | 2021-12-22 | 2022-04-05 | 首都医科大学附属北京口腔医院 | Portable dental treatment cell-phone |
| WO2022089539A1 (en) * | 2020-10-30 | 2022-05-05 | 比亚迪股份有限公司 | Cooling structure of integrated electric drive system and integrated electric drive system |
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| CN2233640Y (en) * | 1995-03-23 | 1996-08-21 | 重庆电机厂 | Main motor for electric vehicle |
| CN1249558A (en) * | 1998-09-28 | 2000-04-05 | 斯沃奇集团管理服务股份公司 | Liquid-cooled asynchronous dynamo |
| US6329731B1 (en) * | 1999-08-10 | 2001-12-11 | The Swatch Group Management Services Ag | Driving unit including a liquid cooled electric motor and a planetary gear |
| JP2006026774A (en) * | 2004-07-14 | 2006-02-02 | Makino Milling Mach Co Ltd | Rotary shaft device |
| CN202818002U (en) * | 2012-07-31 | 2013-03-20 | 联合汽车电子有限公司 | Cooling structure of internal-rotor motor |
| CN204559298U (en) * | 2015-04-28 | 2015-08-12 | 南车株洲电力机车研究所有限公司 | A kind of liquid-cooled motor casing |
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| CN2233640Y (en) * | 1995-03-23 | 1996-08-21 | 重庆电机厂 | Main motor for electric vehicle |
| CN1249558A (en) * | 1998-09-28 | 2000-04-05 | 斯沃奇集团管理服务股份公司 | Liquid-cooled asynchronous dynamo |
| US6329731B1 (en) * | 1999-08-10 | 2001-12-11 | The Swatch Group Management Services Ag | Driving unit including a liquid cooled electric motor and a planetary gear |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018184328A1 (en) * | 2017-04-07 | 2018-10-11 | 上海蔚来汽车有限公司 | Motor cooling system |
| WO2018184327A1 (en) * | 2017-04-07 | 2018-10-11 | 上海蔚来汽车有限公司 | Motor cooling system |
| CN110277842A (en) * | 2018-03-15 | 2019-09-24 | 蔚来汽车有限公司 | Motor with cooling jacket |
| WO2022089539A1 (en) * | 2020-10-30 | 2022-05-05 | 比亚迪股份有限公司 | Cooling structure of integrated electric drive system and integrated electric drive system |
| CN113991916A (en) * | 2021-11-04 | 2022-01-28 | 珠海格力电器股份有限公司 | Motor casing, motor, air compressor machine system and domestic appliance |
| CN114271962A (en) * | 2021-12-22 | 2022-04-05 | 首都医科大学附属北京口腔医院 | Portable dental treatment cell-phone |
| CN114271962B (en) * | 2021-12-22 | 2022-11-25 | 首都医科大学附属北京口腔医院 | Portable dental treatment cell-phone |
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Application publication date: 20170714 |