CN112211831B - Air-suspended high-speed centrifugal compressor - Google Patents
Air-suspended high-speed centrifugal compressorInfo
- Publication number
- CN112211831B CN112211831B CN202011209786.XA CN202011209786A CN112211831B CN 112211831 B CN112211831 B CN 112211831B CN 202011209786 A CN202011209786 A CN 202011209786A CN 112211831 B CN112211831 B CN 112211831B
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- Prior art keywords
- air
- dynamic pressure
- bearing
- housing
- water channel
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
本发明公开了一种空气悬浮高速离心压缩机，涉及压缩机技术领域。空气悬浮高速离心压缩机，包括壳体、定子、转子主轴、蜗壳和叶轮，所述定子设置在所述壳体内，所述蜗壳设置在所述壳体的一端，所述叶轮位于所述蜗壳内，所述壳体内设置有径向动压空气轴承和推力动压空气轴承，所述转子主轴通过所述径向动压空气轴承和所述推力动压空气轴承转动设置在所述壳体内，所述转子主轴的一端与所述叶轮固定连接，所述转子主轴的另一端悬挑在所述定子的内腔中。本发明空气悬浮高速离心压缩机缩短了轴系，既使得设备的结构更加简单紧凑，提高了设备运行的稳定性和抗冲击能力，又减轻了设备的重量。
This invention discloses an air-suspended high-speed centrifugal compressor, relating to the field of compressor technology. The air-suspended high-speed centrifugal compressor includes a housing, a stator, a rotor shaft, a volute, and an impeller. The stator is disposed within the housing, the volute is disposed at one end of the housing, and the impeller is located within the volute. A radial dynamic pressure air bearing and a thrust dynamic pressure air bearing are disposed within the housing. The rotor shaft is rotatably mounted within the housing via the radial and thrust dynamic pressure air bearings. One end of the rotor shaft is fixedly connected to the impeller, and the other end of the rotor shaft is suspended within the inner cavity of the stator. This invention's air-suspended high-speed centrifugal compressor shortens the shaft system, resulting in a simpler and more compact structure, improved operational stability and shock resistance, and reduced weight.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to an air suspension high-speed centrifugal compressor.
Background
The centrifugal compressor is widely applied to industries such as textile, pneumatic tools, part detection, spraying, inflation, fuel cells and the like.
The centrifugal compressor is a dynamic compressor with high-speed rotary impeller, which relies on the interaction force between the rotary impeller and the air flow to raise the pressure of the air, and at the same time, the air flow is accelerated to obtain kinetic energy, and then the air flow is decelerated in a diffuser to convert the kinetic energy into pressure energy, and the pressure is further raised, and the flow of the air is continuous during the compression process.
However, the existing centrifugal compressor is complex in structure, long in shafting, weak in impact resistance and poor in working stability, and cannot meet the market demands.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the air suspension high-speed centrifugal compressor which is simple and compact in structure, short in shafting and high in working stability.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides an air suspension high-speed centrifugal compressor, includes casing, stator, rotor main shaft, spiral case and impeller, the stator sets up in the casing, the spiral case sets up the one end of casing, the impeller is located in the spiral case, be provided with radial dynamic pressure air bearing and thrust dynamic pressure air bearing in the casing, the rotor main shaft passes through radial dynamic pressure air bearing with thrust dynamic pressure air bearing rotates and sets up in the casing, the one end of rotor main shaft with impeller fixed connection, the other end of rotor main shaft encorbelments in the inner chamber of stator.
The rotor spindle is characterized in that a first bearing seat is arranged in the shell, a shaft sleeve is arranged on the first bearing seat, the rotor spindle is rotatably arranged in the shaft sleeve, a plurality of first dynamic pressure grooves for air inflow are circumferentially formed in the position of the rotor spindle corresponding to the shaft sleeve, and the shaft sleeve and the rotor spindle jointly form the radial dynamic pressure air bearing.
The first dynamic pressure grooves are herringbone grooves, and the first dynamic pressure grooves are uniformly distributed along the circumferential direction of the rotor main shaft.
The rotor spindle is provided with a bearing pushing piece, the bearing pushing piece is located between the first bearing seat and the second bearing seat, a plurality of second dynamic pressure grooves for air inflow are respectively formed in the side portions, close to the first bearing seat and the second bearing seat, of the bearing pushing piece, and the end face of the first bearing seat, the end face of the bearing pushing piece and the end face of the second bearing seat jointly form the thrust dynamic pressure air bearing.
The second dynamic pressure grooves are arc-shaped grooves, and the second dynamic pressure grooves on each side are spirally distributed by taking the axis of the thrust piece as a central axis.
The shell comprises a barrel body with two open ends and an end cover arranged at one end of the barrel body, and the stator is arranged in the barrel body and positioned between the end cover and the first bearing seat.
Wherein, air suspension high-speed centrifugal compressor is provided with water-cooling structure, water-cooling structure includes:
the end cover is provided with a plurality of end cover water channel grooves, and one end cover water channel groove is provided with a water inlet and a water outlet;
The water channel groups are arranged on the cylinder body, and each water channel group comprises a water inlet channel and a water return channel which are parallel to the axial direction of the cylinder body;
and a plurality of bearing housing waterway grooves disposed on the first bearing housing;
The end cover water channel grooves are equal in number to the water channel groups and the bearing seat water channel grooves, the end cover water channel grooves are in one-to-one correspondence with the water channel groups, each end cover water channel groove is respectively communicated with the water inlet channel and the water return channel of the same water channel group, and the water inlet channel and the water return channel of the same water channel group are respectively communicated with the two adjacent bearing seat water channel grooves.
The air suspension high-speed centrifugal compressor is provided with an air cooling structure, the air cooling structure comprises a bearing seat air passage arranged on the first bearing seat, a shaft sleeve air passage arranged on the shaft sleeve and an exhaust port arranged on the end cover, and an air inlet of the volute, the bearing seat air passage, the shaft sleeve air passage and the exhaust port are communicated.
The self-circulation casing treatment structure comprises a diversion part which is arranged on the inner wall of the volute in a protruding mode, and an air inlet cylinder which is arranged on the inner wall of the volute through a connecting rib, wherein the diversion part, the air inlet cylinder and the volute jointly enclose an air inlet groove, and a self-circulation air passage which is communicated with the air inlet groove and the inner cavity of the air inlet cylinder is formed between the diversion part and the air inlet cylinder.
Wherein, the air inlet department is provided with the kuppe of toper.
By adopting the technical scheme, the invention has the beneficial effects that:
According to the air suspension high-speed centrifugal compressor, the rotor main shaft is rotationally arranged in the shell through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor main shaft is fixedly connected with the impeller, the other end of the rotor main shaft is overhanging in the inner cavity of the stator, namely, one end of the rotor main shaft and the impeller are overhanging on two sides of the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing respectively, the rotor main shaft drives the impeller to rotate at a high speed, air is used as a lubricant and a coolant, continuous high-pressure gas is output, and compared with the prior art, the shafting is shortened, the structure of the equipment is simpler and more compact, the running stability and the shock resistance of the equipment are improved, the weight of the equipment is reduced, and compared with the prior art, the noise of the equipment is reduced, the running reliability of the equipment is improved, and the service life of the equipment is prolonged by using the air as the lubricant and the coolant for the rotation of the rotor main shaft.
Drawings
FIG. 1 is a schematic view of the structure of an air suspension high speed centrifugal compressor of the present invention;
FIG. 2is a side view of FIG. 1;
FIG. 3 is a schematic view of a portion of the structure of the spindle of the rotor of FIG. 3;
FIG. 4 is a schematic view of the structure of the thrust piece;
FIG. 5 is an exploded view of the housing and first housing of FIG. 1;
FIG. 6 is a block diagram of the other side of FIG. 5;
The device comprises a 1-end cover, a 11-end cover water channel groove, a 12-water inlet, a 13-water outlet, a 14-air outlet, a 15-water inlet pipe, a 16-water outlet pipe, a 2-cylinder body, a 21-water inlet channel, a 22-water return channel, a 3-first bearing seat, a 31-bearing seat water channel groove, a 32-bearing seat air channel, a 4-shaft sleeve, a 41-shaft sleeve air channel, a 5-stator, a 6-rotor spindle, a 61-first dynamic pressure groove, a 7-thrust piece, a 71-second dynamic pressure groove, a 8-second bearing seat, a 9-volute, a 91-air inlet, a 92-guide part, a 93-connecting rib, a 94-air inlet cylinder, a 95-air inlet groove, a 96-self-circulation air channel, a 97-guide cover, a 98-air outlet, a 10-impeller and a 17-briquetting.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 6 together, the air suspension high-speed centrifugal compressor comprises a shell, a stator 5, a rotor main shaft 6, a volute 9 and an impeller 10, wherein the stator 5 is arranged in the shell, the volute 9 is arranged at one end of the shell, the impeller 10 is positioned in the volute 9, a radial dynamic pressure air bearing and a thrust dynamic pressure air bearing are arranged in the shell, the rotor main shaft 6 is rotatably arranged in the shell through the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, one end of the rotor main shaft 6 is fixedly connected with the impeller 10, and the other end of the rotor main shaft 6 is overhanging in an inner cavity of the stator 5.
One end of the rotor main shaft 6 and the impeller 10 are respectively cantilevered at two sides of the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing, so that a shafting is shortened, the structure of the equipment is simpler and more compact, the running stability and the impact resistance of the equipment are improved, and the weight of the equipment is reduced.
The shell comprises a barrel 2 with two open ends and an end cover 1 arranged at one end of the barrel 2, a first bearing seat 3 is arranged in the barrel 2, and a stator 5 is arranged in the barrel 2 and positioned between the end cover 1 and the first bearing seat 3.
The first bearing seat 3 in this embodiment is provided with a shaft sleeve 4, the rotor spindle 6 is rotatably disposed in the shaft sleeve 4, and a plurality of first dynamic pressure grooves 61 for air to flow in are circumferentially disposed at a position of the rotor spindle 6 corresponding to the shaft sleeve 4, and the shaft sleeve 4 and the rotor spindle 6 together form the radial dynamic pressure air bearing. In practice, the first dynamic pressure groove 61 may be provided on the inner surface of the sleeve 4, which is not limited in this embodiment.
The shaft sleeve 4 and the rotor main shaft 6 are directly combined, so that the structure of the whole radial dynamic pressure air bearing is simpler and easy to produce.
Since the herringbone grooves facilitate the formation of the dynamic pressure film, it is preferable in this embodiment that the first dynamic pressure grooves 61 are herringbone grooves, and that the respective first dynamic pressure grooves 61 are uniformly distributed in the circumferential direction of the rotor main shaft 6.
Thus, as shown by the arrow in fig. 3, when the rotor shaft 6 rotates, the air is driven to rotate along with the rotor shaft 6 by the viscosity of the fluid, and at the same time, the air gathers along the two ends of the first dynamic pressure groove 61 toward the middle, forming dynamic pressure films to support the rotor shaft 6, preventing the rotor shaft 6 from moving radially, and when the rotational speed of the rotor shaft 6 is higher, the dynamic pressure bearing capacity of the dynamic pressure films is larger, and the rotor shaft 6 operates more stably.
In order to prevent the pressure in the first dynamic pressure groove 61 from being excessively high, the present embodiment provides a relief hole (not shown in the drawings) in the sleeve 4.
In the embodiment, a second bearing seat 8 is arranged in the cylinder 2, the second bearing seat 8 is positioned between the first bearing seat 3 and the volute 9, a thrust piece 7 is arranged on the rotor main shaft 6, the thrust piece 7 is positioned between the first bearing seat 3 and the second bearing seat 8, a plurality of second dynamic pressure grooves 71 for air inflow are respectively arranged on the side parts of the thrust piece 7, which are close to the first bearing seat 3 and the second bearing seat 8, and the end face of the first bearing seat 3, the end face of the thrust piece 7 and the end face of the second bearing seat 8 jointly form a thrust dynamic pressure air bearing. The structure of the whole thrust dynamic pressure air bearing is simpler and easy to produce by adopting the structure mode that the bearing pushing piece 7 is combined with the end face of the first bearing seat 3 and the end face of the second bearing seat 8.
In this embodiment, the pressing block 17 for pressing the thrust piece is disposed on the rotor spindle 6, the pressing block 17 is located between the thrust piece 7 and the impeller 10, and the pressing block 17 is located in the inner cavity of the second bearing seat 8, the pressing block 17 is pressed by the impeller 10, and then the thrust piece 7 is pressed by the pressing block 17, so that the thrust piece 7 is fixed on the rotor spindle 6, and in practical application, the thrust piece 7 can also be fixed by adopting a screw locking mode.
The second dynamic pressure grooves 71 in the present embodiment are preferably circular arc grooves, and the second dynamic pressure grooves 71 on each side are arranged in a vortex shape with the axis of the thrust bearing piece 7 as the central axis, and the formation of dynamic pressure films is facilitated by adopting such a structure.
Thus, as shown by the arrow in fig. 4, when the rotor spindle 6 rotates, the air is driven to rotate along with the thrust bearing piece 7 by the viscosity of the fluid, and simultaneously, the air gathers from outside to inside along the second dynamic pressure groove 71 to form dynamic pressure film to support the rotor spindle 6, so that the rotor spindle 6 is prevented from moving axially, and when the rotation speed of the rotor spindle 6 is higher, the dynamic pressure bearing capacity of the dynamic pressure film is larger, and the operation of the rotor spindle 6 is more stable.
In order to ensure timely heat dissipation of the air suspension high-speed centrifugal compressor, a water cooling structure is arranged in the embodiment.
Wherein, the water-cooling structure includes:
A plurality of end cover water channel grooves 11 arranged on the end cover 1, wherein one end cover water channel groove 11 is provided with a water inlet 12 and a water outlet 13, the water inlet 12 is connected with a water inlet pipe 15, and the water outlet 13 is connected with a water outlet pipe 16;
A plurality of water channel groups arranged on the cylinder 2, each water channel group comprising a water inlet channel 21 and a water return channel 22 which are parallel to the axial direction of the cylinder 2;
And a plurality of bearing housing waterway grooves 31 provided on the first bearing housing 3;
The end cover water channel grooves 11, the water channel groups and the bearing seat water channel grooves 31 are equal in number, the end cover water channel grooves 11 correspond to the water channel groups one by one, each end cover water channel groove 11 is respectively communicated with the water inlet channel 21 and the water return channel 22 of the same water channel group, and the water inlet channel 21 and the water return channel 22 of the same water channel group are respectively communicated with the two adjacent bearing seat water channel grooves 31.
In order to enhance the sealing property, sealing rings (not shown in the figure) are respectively arranged between the cylinder 2 and the end cover 1 and between the cylinder 2 and the first bearing seat 3.
During operation, water flow enters from the water inlet 12 of the end cover 1 and finally flows out from the water outlet 13 of the end cover 1, the whole water flow is S-shaped in the equipment, the cooling efficiency is greatly improved, the damage of each part in the equipment due to high temperature is avoided, and the service life of each part is prolonged.
In order to further ensure timely heat dissipation of the air suspension high-speed centrifugal compressor, the air cooling structure is arranged in the air suspension high-speed centrifugal compressor at the same time.
The air cooling structure comprises a bearing seat air passage 32 arranged on the first bearing seat 3, a shaft sleeve air passage 41 arranged on the shaft sleeve 4 and an exhaust port 14 arranged on the end cover 1, wherein an air inlet 91 of the volute 9, the bearing seat air passage 32, the shaft sleeve air passage 41 and the exhaust port 14 are communicated.
Through setting up air-cooled structure, can carry out effective heat dissipation to each spare part in the equipment, further avoid each spare part in the equipment to damage because of the temperature is high, prolonged the life of each spare part.
In this embodiment, a self-circulation casing treatment structure is disposed in the volute 9, and the self-circulation casing treatment structure includes a diversion portion 92 protruding from an inner wall of the volute 9, and an air inlet cylinder 94 disposed on the inner wall of the volute 9 through a connection rib 93, where the diversion portion 92, the air inlet cylinder 94 and the volute 9 jointly enclose an air inlet groove 95, and a self-circulation air passage 96 communicating the air inlet groove 95 with an inner cavity of the air inlet cylinder 94 is formed between the diversion portion 92 and the air inlet cylinder 94.
Through setting up self-loopa cartridge receiver processing architecture, the air forms the circulation air current between the inlet end of inlet tube 94, inlet tube 94 inner chamber, self-loopa air flue 96 and air inlet tank 95, has reduced the loss of taking into the air current in the inlet tube 94, has widened the flow scope of equipment, has improved the work efficiency of equipment.
In order to facilitate the flow of gas into the gas cylinder 94, the present embodiment provides a conical pod 97 at the inlet 91 of the volute 9.
During operation, the impeller 10 is directly driven to rotate at a high speed by the rotor spindle 6, gas is sucked in from the air inlet 91 of the volute 9, kinetic energy is converted into pressure energy, the pressure is further improved, and then the gas is thrown out from the air outlet 98, so that clean oil-free continuous gas is output.
In the process, a small amount of gas flows in through a gap between the impeller 10 and the second bearing 8, wherein one part of gas enters the thrust dynamic pressure air bearing and the radial dynamic pressure air bearing to form a supporting and lubricating dynamic pressure film, so that the rotor main shaft 6 is in a suspended state to achieve the purpose of freely rotating, the other part of gas enters the inner cavity of the cylinder 2 through the bearing seat air passage 32 on the first bearing seat 3 and the shaft sleeve air passage 41 on the shaft sleeve 4 to effectively dissipate heat of each part in the cylinder 2, as shown by an arrow direction in fig. 1, and meanwhile, the whole engine body is cooled by a water cooling structure.
The air suspension high-speed centrifugal compressor shortens a shafting by adopting the overhanging structure, not only ensures that the structure of equipment is simpler and more compact, improves the running stability and shock resistance of the equipment, but also lightens the weight, and reduces the noise of the equipment, improves the running reliability of the equipment and prolongs the service life of the equipment by adopting the radial dynamic pressure air bearing and the thrust dynamic pressure air bearing and taking air as a lubricant and a coolant for the rotation of a rotor main shaft.
The present invention is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without performing any inventive work from the above-described concepts, and thus fall within the scope of the present invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209786.XA CN112211831B (en) | 2020-11-03 | 2020-11-03 | Air-suspended high-speed centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209786.XA CN112211831B (en) | 2020-11-03 | 2020-11-03 | Air-suspended high-speed centrifugal compressor |
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| Publication Number | Publication Date |
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| CN112211831A CN112211831A (en) | 2021-01-12 |
| CN112211831B true CN112211831B (en) | 2025-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011209786.XA Active CN112211831B (en) | 2020-11-03 | 2020-11-03 | Air-suspended high-speed centrifugal compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113417869A (en) * | 2021-05-28 | 2021-09-21 | 海拓宾未来工业集团有限公司 | Air suspension type low-pressure pure oil-free centrifugal compressor |
| CN113982985B (en) * | 2021-11-17 | 2024-05-17 | 东南大学 | A micro air channel bearing for an air compressor used in a vehicle-mounted fuel cell |
| CN114635872B (en) * | 2022-04-19 | 2023-09-05 | 广东美芝制冷设备有限公司 | Fan and cleaning equipment |
| CN114790996B (en) * | 2022-04-19 | 2024-02-06 | 广东美芝制冷设备有限公司 | Blower and cleaning device |
| CN114754015B (en) * | 2022-04-19 | 2023-11-10 | 广东美芝制冷设备有限公司 | Fan and cleaning equipment |
| CN114718890B (en) * | 2022-04-19 | 2023-12-22 | 广东美芝制冷设备有限公司 | Fans and cleaning equipment |
| WO2024167148A1 (en) * | 2023-02-06 | 2024-08-15 | 한온시스템 주식회사 | Vehicle air compressor |
| CN117307504A (en) * | 2023-09-26 | 2023-12-29 | 势加透博(重庆)科技有限公司 | A centrifugal compressor and air conditioning system |
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| Publication number | Publication date |
|---|---|
| CN112211831A (en) | 2021-01-12 |
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Country or region after: China Address after: 261206 No. 960 Xingguo Road, Fangzi District, Weifang City, Shandong Province Applicant after: Fuyuan air suspension system (Weifang) Co.,Ltd. Address before: 261206 south of Shuangyang Street East of Xingguo Road, Fangzi District, Weifang City, Shandong Province Applicant before: Weifang Xiangyun Power Technology Co.,Ltd. Country or region before: China |
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