CN115822999A - Sealed cooling structure of high-speed turbine aeration fan - Google Patents
Sealed cooling structure of high-speed turbine aeration fan Download PDFInfo
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- CN115822999A CN115822999A CN202211627112.0A CN202211627112A CN115822999A CN 115822999 A CN115822999 A CN 115822999A CN 202211627112 A CN202211627112 A CN 202211627112A CN 115822999 A CN115822999 A CN 115822999A
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- cooling
- bearing seat
- impeller
- rotating shaft
- aeration fan
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention provides a sealing and cooling structure of a high-speed turbine aeration fan, and relates to the field of high-speed motors. The method comprises the following steps: the outer side of the front cover plate is connected with a volute, an impeller is arranged in the volute, the impeller, the balance disc and the rotating shaft are connected with a long pull rod, the other end of the shell is connected with a rear bearing seat, the inner side of the rear bearing seat is connected with the other end of the rotating shaft through a supporting bearing, the outer side of the rear bearing seat is connected with a rear cover, the outer side of the rear cover is connected with a rear outer cover, a cooling fan is arranged between the rear outer cover and the outer cover, the cooling fan is connected with a short pull rod, the short pull rod is connected with the rotating shaft, and the outer side of the joint of the shell and the rear outer cover is connected with an exhaust hood; the aeration fan cooling device can meet the temperature control requirement of the aeration fan, and can provide a good cooling effect for the aeration fan without adding auxiliary equipment.
Description
Technical Field
The invention relates to the field of high-speed motors, in particular to a sealing and cooling structure of a high-speed turbine aeration fan.
Background
In the field of high-speed motors, the efficiency and the service life of the motor are greatly influenced by the temperature rise of the motor during working, and the difficulty in the production design of the motor is how to effectively control the temperature of the motor. Generally, there are two cooling methods for a high-speed motor: air cooling and water cooling. Most high-speed motor is because calorific capacity is great, all adopts be circulating water cooling, and the independent forced air cooling of few adoption dispels the heat, and the refrigerated advantage of water mainly is that the coolant liquid that flows can take away the heat through external equipment cooling circulation, keeps the temperature far below the coolant liquid boiling point, and the specific heat capacity of liquid is high for cooling speed, effectively reduce motor operating temperature. The disadvantage is that additional accessory equipment is required to be added, accessories such as a circulating water pump, a cooling fan, cooling fins, a water tank and the like are arranged, and the cooling effect on the motor rotor is not achieved.
The prior Chinese utility model patent with publication number CN211521699U discloses a cavitation aerator, which comprises a fan, wherein the top end of the machine body is provided with a clamping groove, a fixed rod is fixedly arranged in the clamping groove, and the fixed rod is connected with the fan; the wind output by the fan can improve the gas flowing speed on the machine body so as to conveniently cool the driving motor working for a long time.
In summary, in the prior art, the auxiliary equipment is added to ventilate the high-speed motor independently, so that the obvious advantage of liquid cooling heat dissipation cannot be achieved, and the defect that the additional auxiliary equipment is needed to be added for liquid cooling heat dissipation is also overcome.
Disclosure of Invention
The invention aims to provide a sealing cooling structure of a high-speed turbine aeration fan, which can meet the temperature control requirement of the aeration fan and can provide a better cooling effect for the aeration fan without adding auxiliary equipment.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a sealed cooling structure of a high-speed turbine aeration fan, which comprises a motor, wherein the motor comprises a shell, a radiating fin is connected in the shell, a stator is arranged in the radiating fin, a rotor is arranged in the stator, a rotating shaft is connected in the middle of the rotor, one end of the rotating shaft is connected with a supporting bearing, a front bearing seat is connected outside the supporting bearing, the front bearing seat is connected to one end of the shell, a front cover plate is connected to the outer side of the front bearing seat, a balance disc is arranged between the front bearing seat and the front cover plate, thrust bearings are abutted to two sides of the balance disc, a volute is connected to the outer side of the front cover plate, an impeller is arranged in the volute, and the impeller, the balance disc and the rotating shaft are all connected with a long pull rod;
the other end of the shell is connected with a rear bearing seat, the inside of the rear bearing seat is connected with the other end of the rotating shaft through a supporting bearing, the outer side of the rear bearing seat is connected with a rear cover, the outer side of the rear cover is connected with a rear outer cover, a cooling fan is arranged between the rear outer cover and the outer cover, the cooling fan is connected with a short pull rod, and the short pull rod is connected with the rotating shaft;
the outer side of the joint of the shell and the rear outer cover is connected with an exhaust hood.
Through above-mentioned technical scheme, form along motor housing and be used for carrying out the many cooling air runner structures of refrigerated to stator, bearing frame and rotor, carry out work through connecting in the pivot cooling fan and need not increase solitary cooling arrangement to improve cooling efficiency through a plurality of cooling air runners.
In some embodiments of the invention, the thrust bearing and the support bearing are both aerodynamic foil bearings.
Through above-mentioned technical scheme, thrust bearing and support bearing all use air dynamic pressure foil bearing, and air bearing utilizes gas as emollient, compares with grease lubrication or oil lubrication that traditional ball bearing used, can not cause gaseous pollution, and the cooling gas source's of having guaranteed cleanness has also reduced the friction simultaneously, has improved work efficiency.
In some embodiments of the present invention, a copper seal ring is mounted between the housing, the volute, the rear bearing seat and the rear housing.
Through the technical scheme, the annealed red copper ring is adopted for sealing among the shell, the volute, the rear bearing seat and the rear outer cover, so that leakage of cooling gas is reduced, and stability of air pressure among all chambers is guaranteed.
In some embodiments of the present invention, the motor is a high-speed permanent magnet synchronous motor.
Through the technical scheme, the permanent magnet synchronous motor has the advantages of small volume, light weight, high efficiency and low power consumption, because the rotor of the permanent magnet synchronous motor is provided with a magnetic field, the rotor does not need an additional power supply or an excitation winding, the motor can be relatively small in volume and mass, and in addition, the motor does not have excitation loss, so the power density efficiency of the motor is higher.
In some embodiments of the invention, the impeller is a ternary centrifugal impeller.
Through the technical scheme, the blade shape of the ternary impeller can be determined according to the flow requirement, the blade inlet can be designed to be air inlet at a zero attack angle, and the obtained surface load distribution of the blade is uniform, so that the ternary impeller has better flow characteristics.
In some embodiments of the present invention, the back surfaces of the impeller and the cooling fan are both provided with a comb tooth sealing structure.
Through above-mentioned technical scheme, broach seal structure can increase the leakproofness and reduce the revealing of cooling gas, guarantees the stability of atmospheric pressure between each cavity.
In some embodiments of the present invention, the heat sink includes a fin structure, and a protrusion structure is disposed at a tip of the fin structure.
Through the technical scheme, the area contacted with air can be increased under the condition of not reducing flow resistance, and the heat exchange efficiency is improved.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
form along motor housing and be used for carrying out the many cooling air runner structure that cool off to stator, bearing frame and rotor, do not need to increase solitary cooling arrangement through connecting the cooling fan that carries out work in the pivot to improve cooling efficiency through a plurality of cooling air runner.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a cooling air path according to an embodiment of the present invention;
FIG. 3 is a schematic view of a heat sink in accordance with an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic view of the structure of the outlet B in FIG. 2;
FIG. 6 is a schematic view of a thrust bearing according to an embodiment of the present invention;
FIG. 7 is a schematic view of an impeller and cooling fan seal tooth according to an embodiment of the present invention.
Icon: 1-a volute; 2-an impeller; 3-a housing; 4-front cover plate; 5-a balance disc; 6-front bearing seat; 7-a stator; 8-a heat sink; 9-rear bearing seat; 10-rear outer cover; 11-a rear cover; 12-a cooling fan; 13-short pull rod; 14-long pull rod; 15-a rotor; 16-an exhaust hood; 17-cooling the rotating shaft.
Detailed Description
Examples
Referring to fig. 1-7, fig. 1-7 illustrate an embodiment of the present application.
The embodiment provides a sealed cooling structure of a high-speed turbine aeration fan, which comprises a motor, wherein the motor comprises a shell 3, a radiating fin 8 is connected in the shell 3, a stator 7 is arranged in the radiating fin 8, a rotor 15 is arranged in the stator 7, a rotating shaft 17 is connected in the middle of the rotor 15, one end of the rotating shaft 17 is connected with a bearing, a front bearing seat 6 is connected outside the bearing, the front bearing seat 6 is connected to one end of the shell 3, a front cover plate 4 is connected to the outer side of the front bearing seat 6, a balance disc 5 is arranged between the front bearing seat 6 and the front cover plate 4, thrust bearings are arranged on two sides of the balance disc 5, a volute 1 is connected to the outer side of the front cover plate 4, an impeller 2 is arranged in the volute 1, and the impeller 2, the balance disc 5 and the rotating shaft 17 are all connected with a long pull rod 14;
the other end of the shell 3 is connected with a rear bearing seat 9, the inside of the rear bearing seat 9 is connected with the other end of a rotating shaft 17 through a bearing, the outer side of the rear bearing seat 9 is connected with a rear cover 11, the outer side of the rear cover 11 is connected with a rear outer cover 10, a cooling fan 12 is arranged between the rear outer cover 10 and the outer cover 11, the cooling fan 12 is connected with a short pull rod 13, and the short pull rod 13 is connected with the rotating shaft 17;
an exhaust hood 16 is connected to the outer side of the joint of the housing 3 and the rear cover 10.
When the rotor system is used, the radiating fins 8 are arranged in the shell 3 of the motor, the radiating fins 8 are machined by aluminum alloy materials with good heat conduction, as shown in fig. 3 and 4, the outer rings of the radiating fins 8 are machined into a multi-groove-shaped structure and are uniformly distributed, the high-speed permanent magnet synchronous motor stator 7 is arranged in the radiating fins 8, the radiating fins 8 and the stator 7 are assembled in an interference fit mode, the radiating fins 8 and the stator 7 are tightly matched when the working temperature is met, smooth heat conduction is guaranteed, the whole shaft system adopts a hollow shaft and pull rod direct connection technology, the rotor 15 is pressed on the hollow rotating shaft 17, the rotating shaft 17 is connected with the pull rod through threads, the impeller 2 machined by 7075 high-performance aluminum alloy materials is inserted, the cooling fan 12 and the balance disc 5, and a complete rotor system is formed. The hollow shaft design further reduces the mass of the whole rotor, improves the aerodynamic performance of the whole rotor 15 under the condition of ensuring the rigidity, and ensures the stability of rotation by fixing the impeller 2, the cooling fan 12 and the pull rod through round nuts and applying a certain pretightening force. Wherein, the pull rod at the impeller end adopts left-handed fine thread to prevent looseness caused at high rotating speed. The air bearings on the front bearing seat 6 and the rear bearing seat 9 are assembled in a heating mode, and the close fit of the bearings and the bearing seats is ensured. The end surface of the shaft sleeve is pressed by a screw, so that the bearing cannot slide in a sliding way during working;
as shown in fig. 2, the cooling fan 12 driven by the high-speed rotation of the motor brings the cooling air into the fan from the inlet a, passes through the gap between the casing 3 and the rear housing 10, is reduced through the space, and accelerates the speed of the extruded air through the heat sink 8, thereby taking away the heat generated during the operation of the stator 7, at this time, a large amount of hot air will rise and flow to the upper region of the casing, and is discharged out of the casing through the perforated region B of the upper part of the casing, and is collected by the exhaust hood 16 and then centrally discharged, which is the first heat dissipation channel in the structural design. The size of the opening of the shell exhaust B is limited, most of the residual cooling air continuously participates in the thermal cycle, at the moment, the air is guided by the front bearing seat 6 with the taper and circulates to the middle area of the stator 7 and the rotor 15, one path of the cooling air and two thrust bearings passes through the front bearing seat 6, the other path of the cooling air and two thrust bearings passes through the gap between the rotor and the stator to cool the rotating shaft 17 and the air bearing in the rear bearing seat 9, and finally the cooling air and the exhaust hood 16 are collected through the radial opening of the rear bearing seat 9 and then are intensively discharged.
Through the technical scheme, a multi-cooling air flow channel structure for cooling the stator 7, the bearing seat and the rotor 15 is formed along the shell 3 of the motor, the cooling fan 12 connected to the rotating shaft does not need to be additionally provided with independent cooling equipment, and the cooling efficiency is improved through a plurality of cooling air flow channels.
In a preferred embodiment, the thrust bearing and the bearing are both aerodynamic foil bearings.
It should be noted that, the aerodynamic foil bearing is a disclosure technology, and those skilled in the art can purchase corresponding models through various channels according to different size requirements, and no further description and limitation is made on the internal structure thereof, and any aerodynamic foil bearing that can satisfy the present embodiment can be used.
Through the technical scheme, the thrust bearing and the support bearing both use the air dynamic pressure foil bearing, the air bearing utilizes gas as a lubricating agent, and compared with grease lubrication or oil lubrication used by the traditional ball bearing, the air bearing does not cause gas pollution, ensures the cleanness of a cooling gas source, reduces friction and improves the working efficiency.
In a preferred embodiment, copper seal rings are mounted between the housing 3, the volute 1, the rear bearing seat 9 and the rear housing 10.
Through the technical scheme, the shell 3, the volute 1, the rear bearing seat 9 and the rear outer cover 10 are sealed by the annealed red copper ring, so that leakage of cooling gas is reduced, and stability of air pressure among all chambers is guaranteed.
As a preferred embodiment, the motor is a high-speed permanent magnet synchronous motor.
Through the technical scheme, the permanent magnet synchronous motor has the advantages of small volume, light weight, high efficiency and low power consumption, because the rotor 15 of the permanent magnet synchronous motor is provided with a magnetic field, the rotor 15 does not need to be additionally powered and does not need an excitation winding, the motor can be relatively small in volume and mass, and in addition, the motor does not have excitation loss, so the power density efficiency of the motor is higher.
In a preferred embodiment, the impeller 2 is a three-stage centrifugal impeller.
It should be noted that the specific blade dimension specification and calculation method of the ternary centrifugal impeller can be designed according to actual needs by those skilled in the art according to the centrifugal compressor principle published by mechanical industry publishers and the centrifugal compressor ternary flow theory and application published by the western security traffic university publishers without creative work, and are not separately illustrated and limited herein.
Through the technical scheme, the blade shape of the ternary impeller can be determined according to the flow requirement, the blade inlet can be designed to be air inlet at a zero attack angle, and the obtained surface load distribution of the blade is uniform, so that the ternary impeller has better flow characteristics.
In a preferred embodiment, the impeller 2 and the cooling fan 12 are each provided with a comb seal structure on the rear surface thereof.
In use, as shown in fig. 7, a multi-layer annular comb-tooth-shaped seal structure is provided on the back surfaces of the impeller 2 and the cooling fan 12.
Through above-mentioned technical scheme, broach seal structure can increase the leakproofness and reduce revealing of cooling gas, guarantees the stability of atmospheric pressure between each cavity.
As a preferred embodiment, the heat sink 8 includes a fin structure, and a protrusion structure is disposed at a tip of the fin structure.
In use, the heat sink 8 is shaped as shown in figures 3 and 4.
Through the technical scheme, the area contacted with air can be increased under the condition of not reducing flow resistance, and the heat exchange efficiency is improved.
In summary, embodiments of the present invention provide a sealing and cooling structure for a high-speed turbine aerator, which has at least the following advantages over the prior art:
1. a multi-cooling air flow channel structure for cooling the stator, the bearing seat and the rotor is formed along the motor shell, a cooling fan connected to the rotating shaft does not need to be additionally provided with independent cooling equipment for working, and the cooling efficiency is improved through a plurality of cooling air flow channels;
2. the adoption of the air dynamic pressure foil bearing can not cause gas pollution, ensure the cleanness of a cooling gas source, reduce friction and improve the working efficiency;
3. the annealed red copper ring is adopted for sealing and the comb tooth sealing structure, so that the leakage of cooling gas is reduced, the stability of the air pressure among all chambers is ensured, and the cooling efficiency is improved;
4. the power density and efficiency of the high-speed permanent magnet synchronous motor are higher;
5. the ternary impeller has better flow characteristics;
6. by adopting the special radiating fin structure, the contact area with air can be increased under the condition of not reducing the flow resistance, and the heat exchange efficiency is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A sealed cooling structure of a high-speed turbine aeration fan comprises a motor and is characterized in that the motor comprises a shell (3), cooling fins (8) are connected in the shell (3), stators (7) are arranged in the cooling fins (8), rotors (15) are arranged in the stators (7), a rotating shaft (17) is connected in the middle of each rotor (15), one end of each rotating shaft (17) is connected with a supporting bearing, a front bearing seat (6) is connected outside each supporting bearing, each front bearing seat (6) is connected to one end of the shell (3), a front cover plate (4) is connected to the outer side of each front bearing seat (6), a balance disc (5) is arranged between each front bearing seat (6) and the corresponding front cover plate (4), thrust bearings are abutted to two sides of each balance disc (5), a volute (1) is connected to the outer side of each front cover plate (4), an impeller (2) is arranged in each volute (1), and long pull rods (14) are connected to each impeller (2), each balance disc (5) and each rotating shaft (17); the other end of the shell (3) is connected with a rear bearing seat (9), the other end of a rotating shaft (17) is connected in the rear bearing seat (9) through a supporting bearing, a rear cover (11) is connected to the outer side of the rear bearing seat (9), a rear outer cover (10) is connected to the outer side of the rear cover (11), a cooling fan (12) is arranged between the rear outer cover (10) and the outer cover (11), the cooling fan (12) is connected with a short pull rod (13), and the short pull rod (13) is connected with the rotating shaft (17);
an exhaust hood (16) is connected to the outer side of the joint of the shell (3) and the rear outer hood (10).
2. The seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein the thrust bearing and the support bearing are aerodynamic foil bearings.
3. The seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein a copper seal ring is installed between the housing (3), the volute (1), the rear bearing seat (9) and the rear housing (10).
4. The seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein the motor is a high-speed permanent magnet synchronous motor.
5. A seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein the impeller (2) is a ternary centrifugal impeller.
6. The seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein the impeller (2) and the cooling fan (12) are each provided with a comb-tooth seal structure on the back side.
7. The seal cooling structure of a high-speed turbo-aeration fan according to claim 1, wherein the heat sink (8) comprises a fin-like structure provided with a raised structure at a tip end thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211627112.0A CN115822999A (en) | 2022-12-17 | 2022-12-17 | Sealed cooling structure of high-speed turbine aeration fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211627112.0A CN115822999A (en) | 2022-12-17 | 2022-12-17 | Sealed cooling structure of high-speed turbine aeration fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115822999A true CN115822999A (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211627112.0A Withdrawn CN115822999A (en) | 2022-12-17 | 2022-12-17 | Sealed cooling structure of high-speed turbine aeration fan |
Country Status (1)
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| CN (1) | CN115822999A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1321680A2 (en) * | 2001-12-22 | 2003-06-25 | Miscel Oy | Turbo machine |
| US20120207585A1 (en) * | 2011-02-07 | 2012-08-16 | Robert Anderson | Centrifugal Compressor |
| CN103326512A (en) * | 2013-05-16 | 2013-09-25 | 西安交通大学 | Centrifugal air compressor cooling structure driven by ultra-high-speed permanent magnet motor |
| CN206487650U (en) * | 2017-01-22 | 2017-09-12 | 中国工程物理研究院机械制造工艺研究所 | The cfentrifugal blower of inner air cooling is realized using direct-connected high-speed permanent magnet motor |
| KR20180080148A (en) * | 2018-06-19 | 2018-07-11 | 주식회사 아이삭 | A turbo blower motor comprising cooling hole |
| CN209472502U (en) * | 2019-01-23 | 2019-10-08 | 牧风科技有限公司 | Motor and gas suspension fluid machines based on novel cooling structure |
| US20200132081A1 (en) * | 2018-10-30 | 2020-04-30 | Turbowin Co., Ltd. | Turbo blower with impeller unit-cooling fan for fuel cell |
| WO2021227262A1 (en) * | 2020-05-11 | 2021-11-18 | 山东省章丘鼓风机股份有限公司 | Permanent magnet direct drive slurry pump having water cooling circulation structure |
| CN113824253A (en) * | 2021-10-08 | 2021-12-21 | 珠海格力电器股份有限公司 | Air guide device, motor air duct structure and magnetic suspension motor |
| CN114017365A (en) * | 2021-11-12 | 2022-02-08 | 海南极锐浩瀚动力系统科技有限公司 | High-speed air suspension compressor for fuel cell with enclosed stator, fuel cell system and vehicle |
| KR102460715B1 (en) * | 2022-01-25 | 2022-10-28 | 이일희 | Turbo blower cooling structure |
-
2022
- 2022-12-17 CN CN202211627112.0A patent/CN115822999A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1321680A2 (en) * | 2001-12-22 | 2003-06-25 | Miscel Oy | Turbo machine |
| US20120207585A1 (en) * | 2011-02-07 | 2012-08-16 | Robert Anderson | Centrifugal Compressor |
| CN103326512A (en) * | 2013-05-16 | 2013-09-25 | 西安交通大学 | Centrifugal air compressor cooling structure driven by ultra-high-speed permanent magnet motor |
| CN206487650U (en) * | 2017-01-22 | 2017-09-12 | 中国工程物理研究院机械制造工艺研究所 | The cfentrifugal blower of inner air cooling is realized using direct-connected high-speed permanent magnet motor |
| KR20180080148A (en) * | 2018-06-19 | 2018-07-11 | 주식회사 아이삭 | A turbo blower motor comprising cooling hole |
| US20200132081A1 (en) * | 2018-10-30 | 2020-04-30 | Turbowin Co., Ltd. | Turbo blower with impeller unit-cooling fan for fuel cell |
| CN209472502U (en) * | 2019-01-23 | 2019-10-08 | 牧风科技有限公司 | Motor and gas suspension fluid machines based on novel cooling structure |
| WO2021227262A1 (en) * | 2020-05-11 | 2021-11-18 | 山东省章丘鼓风机股份有限公司 | Permanent magnet direct drive slurry pump having water cooling circulation structure |
| CN113824253A (en) * | 2021-10-08 | 2021-12-21 | 珠海格力电器股份有限公司 | Air guide device, motor air duct structure and magnetic suspension motor |
| CN114017365A (en) * | 2021-11-12 | 2022-02-08 | 海南极锐浩瀚动力系统科技有限公司 | High-speed air suspension compressor for fuel cell with enclosed stator, fuel cell system and vehicle |
| KR102460715B1 (en) * | 2022-01-25 | 2022-10-28 | 이일희 | Turbo blower cooling structure |
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Application publication date: 20230321 |