CN116877431A - Air-cooled variable-frequency screw compressor - Google Patents
Air-cooled variable-frequency screw compressor Download PDFInfo
- Publication number
- CN116877431A CN116877431A CN202311145860.XA CN202311145860A CN116877431A CN 116877431 A CN116877431 A CN 116877431A CN 202311145860 A CN202311145860 A CN 202311145860A CN 116877431 A CN116877431 A CN 116877431A
- Authority
- CN
- China
- Prior art keywords
- air
- motor
- cover body
- screw compressor
- frequency converter
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000017525 heat dissipation Effects 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The application relates to the technical field of compressors, in particular to an air-cooled variable-frequency screw compressor, which comprises a compressor body, a motor and a frequency converter, wherein the motor is in communication connection with the frequency converter, an output shaft of the motor is in transmission connection with the compressor body, the frequency converter comprises a cover body and a control device arranged in the cover body, the cover body is arranged on the motor, an air inlet is arranged at the lower end of the cover body, an air outlet is arranged at one side of the cover body, a cooling fan is arranged at the air outlet and is in communication connection with the control device, and cooling air formed by the cooling fan passes through the air inlet to dissipate heat of the control device. The frequency converter is integrated on the compressor, so that the interference of the frequency converter to the power grid is reduced, the fault point of the whole machine is reduced, and the operation is safer and more reliable; by arranging the independent cooling fan on the frequency converter, effective heat dissipation can be carried out according to the temperature of the frequency converter, the heat dissipation effect is not limited by the rotating speed of the motor any more, the highest application environment temperature can reach 50 ℃, and the application range and the service life of the screw compressor are improved.
Description
Technical Field
The application relates to the technical field of compressors, in particular to an air-cooled variable-frequency screw compressor.
Background
The variable-frequency screw compressor unit has the characteristics of stable air pressure, more energy saving, no impact during starting, low noise, low running cost, long service life of the compressor, small requirement on the capacity of an air storage tank and the like, and is favored by the market. The frequency converter changes the transmission of the motor by adjusting the frequency of the input current of the motor, and the motor drives the compressor to work. The screw compressor adopting the external frequency converter not only increases the occupied area of the whole machine, but also has larger interference to the power grid, and increases the fault point of the whole machine.
To reduce the footprint, the frequency converter is partially integrated with the motor to form an integrated screw compressor. When the motor and the compressor work, a large amount of heat is generated, in order to ensure the service life of the frequency converter, the frequency converter is cooled by adopting an air cooling or liquid refrigerant evaporation cooling mode, wherein the air cooling is realized by installing a fan coaxial with the compressor on the motor, when the rotating speed of the motor is low, the rotating speed of the fan is synchronously reduced, the air quantity is reduced, the wind pressure is reduced, the cooling effect is further reduced, the reliability and the service life of the frequency converter are influenced to a certain extent, and the frequency converter is generally allowed to be applied to a working environment with the temperature less than 40 ℃. The liquid refrigerant is only used for working conditions with phase change, is not suitable for most of application occasions without phase change working conditions such as gas pressurization, air compression and the like, and can cause the reduction of the effective refrigerating capacity and the coefficient of performance COP of the compressor. Therefore, how to realize cooling of the compressor package becomes a problem to be solved.
Disclosure of Invention
The application provides an air-cooled variable-frequency screw compressor aiming at the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides an air-cooled variable frequency screw compressor, includes compressor body, motor and converter, the motor with converter communication connection, the output shaft of motor with compressor body transmission is connected, the converter includes the cover body and sets up the internal control device of cover, the cover body sets up on the motor, the lower extreme of the cover body is equipped with the air intake, one side of the cover body is equipped with the air outlet, air outlet department is equipped with cooling fan, cooling fan with control device communication connection, cooling fan forms the cooling air pass the air intake is right control device dispels the heat.
On the basis of the technical scheme, the application can also make the following improvements for the technical scheme in order to achieve the convenience of use and the stability of equipment:
further, the novel cover comprises a separation plate, wherein the separation plate is arranged in the cover body and separates the cover body into an upper cover body and a lower cover body, and a plurality of ventilation holes are formed in the separation plate.
Further, the control device is located in the upper cover body, the control device comprises a heating element and a wiring board, the heating element is installed on the partition plate above the air inlet, and the wiring board is located on one side of the partition plate.
Further, the radiator is arranged at the lower end of the partition plate.
Further, the air inlet and the air outlet are both provided with a protective net, and the protective net is provided with a plurality of through holes.
Further, the compressor body comprises a shell, and a male rotor and a female rotor which are meshed in the shell, wherein the male rotor is in transmission connection with the output end of the motor.
Further, the motor also comprises a coupler, and an output shaft of the motor is in transmission connection with the male rotor through the coupler.
Further, a protective shell is arranged on the outer side of the coupler.
The beneficial effects of the application are as follows: the frequency converter is integrated on the compressor, so that the interference of the frequency converter to a power grid is reduced, the fault point of the whole machine is reduced, and the operation is safer and more reliable; by arranging the independent cooling fan on the frequency converter, effective heat dissipation can be carried out according to the temperature of the frequency converter, the heat dissipation effect is not limited by the rotating speed of the motor any more, the highest application environment temperature can reach 50 ℃, and the application range and the service life of the screw compressor are improved; the rotating speed is regulated by changing the frequency of an input power supply, so that the whole process stepless variable speed energy regulation of the compressor is realized. The motor rotation speed can be far greater than the synchronous rotation speed of the power frequency power supply, so that the displacement of the compressor is greatly improved, and the unit displacement cost of the compressor is reduced; the variable frequency control system can also operate at a synchronous rotating speed lower than the power frequency power supply according to the end load, and has obvious energy-saving effect compared with a conventional capacity control mode under the partial load condition, so that economical operation can be realized.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
fig. 2 is a cross-sectional view of the present application.
Reference numerals: 1. a housing; 2. a frequency converter; 21. a wiring board; 22. a heating element; 23. a heat sink; 24. a partition plate; 3. a motor; 4. a cooling fan; 5. a male rotor; 6. a female rotor; 7. a protective shell; 8. a coupling; 9. an output shaft; 10. an air inlet; 11. a cover body.
Detailed Description
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or component to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principles and features of the present application are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the application and are not to be construed as limiting the scope of the application.
As shown in fig. 1 to 2, the application discloses an air-cooled variable-frequency screw compressor, which comprises a compressor body, a motor 3 and a frequency converter 2, wherein the motor 3 is in communication connection with the frequency converter 2, the output end of the motor 3 is in transmission connection with the compressor body, the compressor body comprises a shell 1, a male rotor 5 and a female rotor 6 which are meshed in the shell 1, the male rotor 5 is in transmission connection with an output shaft 9 of the motor 3, the male rotor 5 rotates under the driving of the motor 3, so that the female rotor 6 is driven to rotate, the air compression circulation is realized, the frequency converter 2 comprises a cover 11 and a control device arranged in the cover 11, the cover 11 is arranged on the motor 3, an air inlet 10 is arranged at the lower end of the cover 11, the probability that foreign matters fall into the cover 11 through the air inlet 10 is reduced, the normal work of the control device is ensured, an air outlet 4 is arranged at one side of the cover 11, the cooling fan 4 is in communication connection with the control device, and the cooling fan 4 forms a cooling air inlet 10 for controlling the air inlet. The cooling fan 4 is an air suction fan, and when the cooling fan 4 works, generated cooling air enters the cover 11 from the air inlet 10 to radiate heat of the control device, and then is discharged through the air outlet, so that the temperature of the control device is reduced, and the service life of the frequency converter 2 is prolonged. Through integrating the frequency converter 2 on the compressor body, the interference of the frequency converter 2 to the power grid is reduced, the fault point and the occupied area of the whole machine are reduced, and the operation is safer and more reliable.
The air-cooled variable-frequency screw compressor further comprises a separation plate 24, wherein the separation plate 24 is arranged in the cover body 11 and separates the cover body 11 into an upper cover body and a lower cover body, and a plurality of ventilation holes are formed in the separation plate 24. Part of the cooling air entering the cover body 11 through the air inlet 10 dissipates heat of devices in the lower cover body, then is discharged through the air outlet, and the other part of the cooling air enters the upper cover body through the air vent, so that the devices in the upper cover body are cooled and dissipated, and then are discharged through the air outlet, the cover body 11 is divided into two air channels through the partition plate 24, and the cooling effect is improved.
The control device is positioned in the upper cover body, the control device comprises a heating element 22 and a wiring board 21, the heating element 22 is arranged on a division board 24 above the air inlet 10, and the wiring board 21 is positioned on one side of the division board 24. The heating element 22 includes an IGBT, a rectifier bridge, a capacitor, and the like. The cooling air entering through the air inlet 10 firstly dissipates heat of the heating element 22, so that the temperature of the heating element 22 is guaranteed to be reduced in time, and the heat dissipation effect is guaranteed.
The air-cooled variable-frequency screw compressor further comprises a radiator 23, and the radiator 23 is arranged at the lower end of the partition plate 24. The radiator 23 plays a role in radiating heat to the heating element 22, and the radiator 23 and cooling air jointly cool and radiate the heating element 22 to strengthen the heat exchange effect.
The air inlet 10 and the air outlet are both provided with a protective net, and the protective net is provided with a plurality of through holes. Foreign matters are prevented from entering the cover 11 through the air inlet 10 or the air outlet to influence the normal operation of the control device, and the normal operation of the whole compressor is ensured.
The air-cooled variable-frequency screw compressor further comprises a coupler 8, an output shaft 9 of the motor 3 is in transmission connection with the male rotor 5 through the coupler 8, a protective shell 7 is arranged on the outer side of the coupler 8, difficulty in installation between the motor 3 and the male rotor 5 is reduced, and assembly efficiency is improved.
Further, the motor 3 can be cooled by liquid in the prior art, so that the service life of the motor 3 is prolonged.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (8)
1. The utility model provides an forced air cooling variable frequency screw compressor, includes compressor body, motor (3) and converter (2), motor (3) with converter (2) communication connection, the output of motor (3) with compressor body transmission is connected, a serial communication port, converter (2) are in including cover body (11) and setting control device in cover body (11), cover body (11) set up on motor (3), the lower extreme of cover body (11) is equipped with air intake (10), one side of cover body (11) is equipped with the air outlet, air outlet department is equipped with cooling fan (4), cooling fan (4) with control device communication connection, cooling fan (4) formed cooling air pass air intake (10) are right control device dispels the heat.
2. An air-cooled variable frequency screw compressor according to claim 1, further comprising a partition plate (24), wherein the partition plate (24) is disposed in the housing (11) and divides the housing (11) into an upper housing and a lower housing, and a plurality of ventilation holes are formed in the partition plate (24).
3. An air-cooled variable frequency screw compressor according to claim 2, characterized in that the control means is located in the upper casing, the control means comprising a heating element (22) and a wiring board (21), the heating element (22) being mounted on a partition plate (24) above the air intake (10), the wiring board (21) being located on one side of the partition plate (24).
4. An air-cooled variable frequency screw compressor according to claim 3, further comprising a radiator (23), said radiator (23) being mounted at a lower end of said partition plate (24).
5. An air-cooled variable frequency screw compressor as claimed in claim 1 or 2, wherein the air inlet (10) and the air outlet are provided with a protective net, and the protective net is provided with a plurality of through holes.
6. An air-cooled variable frequency screw compressor according to claim 1 or 2, characterized in that the compressor body comprises a housing (1) and a male rotor (5) and a female rotor (6) which are arranged in the housing (1) and meshed, wherein the male rotor (5) is in transmission connection with the output end of the motor (3).
7. An air-cooled variable frequency screw compressor according to claim 6, further comprising a coupling (8), wherein the output shaft (9) of the motor (3) is in driving connection with the male rotor (5) via the coupling (8).
8. An air-cooled variable frequency screw compressor as claimed in claim 7, wherein the outer side of the coupling (8) is provided with a protective shell (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311145860.XA CN116877431B (en) | 2023-09-07 | 2023-09-07 | Air-cooled variable-frequency screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311145860.XA CN116877431B (en) | 2023-09-07 | 2023-09-07 | Air-cooled variable-frequency screw compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116877431A true CN116877431A (en) | 2023-10-13 |
| CN116877431B CN116877431B (en) | 2023-12-05 |
Family
ID=88259092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311145860.XA Active CN116877431B (en) | 2023-09-07 | 2023-09-07 | Air-cooled variable-frequency screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116877431B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030228229A1 (en) * | 2002-06-05 | 2003-12-11 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel,Ltd) | Screw compressor |
| CN201874822U (en) * | 2010-09-17 | 2011-06-22 | 厄利孔莱博尔德真空技术有限责任公司 | Screw type vacuum pump |
| JP2012047185A (en) * | 2011-12-07 | 2012-03-08 | Hitachi Industrial Equipment Systems Co Ltd | Oilless screw compressor |
| JP2014040837A (en) * | 2013-10-09 | 2014-03-06 | Hitachi Industrial Equipment Systems Co Ltd | Unrefuel screw compressor |
| CN205559285U (en) * | 2016-04-15 | 2016-09-07 | 苏州通润驱动设备股份有限公司 | Take helical -lobe compressor host computer of converter |
| CN207753567U (en) * | 2018-01-27 | 2018-08-21 | 青岛中加特变频电机有限公司 | Frequency conversion all-in-one machine air cooling equipment |
| CN108700055A (en) * | 2016-05-09 | 2018-10-23 | 株式会社日立产机系统 | Box compressor |
| US20190072090A1 (en) * | 2016-02-25 | 2019-03-07 | Advancing Pump Technology Crop. | Electric motor and rod-driven rotary gear pumps |
| CN215421348U (en) * | 2021-06-09 | 2022-01-04 | 天津同创达科电气设备有限公司 | Heat radiator for electric submersible pump variable frequency speed governing cabinet body |
| CN114069940A (en) * | 2021-11-11 | 2022-02-18 | 中船重工电机科技股份有限公司 | Strong air cooling structure of broadband variable frequency motor |
| CN115095521A (en) * | 2022-07-01 | 2022-09-23 | 华海(北京)科技股份有限公司 | Energy-concerving and environment-protective type permanent magnetism frequency conversion air compressor machine |
| CN219159189U (en) * | 2022-12-14 | 2023-06-09 | 宜丰俊亚实业有限公司 | Energy-saving environment-friendly permanent magnet variable-frequency screw machine capable of stably supplying pressure |
-
2023
- 2023-09-07 CN CN202311145860.XA patent/CN116877431B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030228229A1 (en) * | 2002-06-05 | 2003-12-11 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel,Ltd) | Screw compressor |
| CN201874822U (en) * | 2010-09-17 | 2011-06-22 | 厄利孔莱博尔德真空技术有限责任公司 | Screw type vacuum pump |
| JP2012047185A (en) * | 2011-12-07 | 2012-03-08 | Hitachi Industrial Equipment Systems Co Ltd | Oilless screw compressor |
| JP2014040837A (en) * | 2013-10-09 | 2014-03-06 | Hitachi Industrial Equipment Systems Co Ltd | Unrefuel screw compressor |
| US20190072090A1 (en) * | 2016-02-25 | 2019-03-07 | Advancing Pump Technology Crop. | Electric motor and rod-driven rotary gear pumps |
| CN205559285U (en) * | 2016-04-15 | 2016-09-07 | 苏州通润驱动设备股份有限公司 | Take helical -lobe compressor host computer of converter |
| CN108700055A (en) * | 2016-05-09 | 2018-10-23 | 株式会社日立产机系统 | Box compressor |
| CN207753567U (en) * | 2018-01-27 | 2018-08-21 | 青岛中加特变频电机有限公司 | Frequency conversion all-in-one machine air cooling equipment |
| CN215421348U (en) * | 2021-06-09 | 2022-01-04 | 天津同创达科电气设备有限公司 | Heat radiator for electric submersible pump variable frequency speed governing cabinet body |
| CN114069940A (en) * | 2021-11-11 | 2022-02-18 | 中船重工电机科技股份有限公司 | Strong air cooling structure of broadband variable frequency motor |
| CN115095521A (en) * | 2022-07-01 | 2022-09-23 | 华海(北京)科技股份有限公司 | Energy-concerving and environment-protective type permanent magnetism frequency conversion air compressor machine |
| CN219159189U (en) * | 2022-12-14 | 2023-06-09 | 宜丰俊亚实业有限公司 | Energy-saving environment-friendly permanent magnet variable-frequency screw machine capable of stably supplying pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116877431B (en) | 2023-12-05 |
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