CN211288028U - Air compressor machine cooling system - Google Patents
Air compressor machine cooling system Download PDFInfo
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- CN211288028U CN211288028U CN201921962015.0U CN201921962015U CN211288028U CN 211288028 U CN211288028 U CN 211288028U CN 201921962015 U CN201921962015 U CN 201921962015U CN 211288028 U CN211288028 U CN 211288028U
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- air compressor
- heat exchanger
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Abstract
The utility model discloses an air compressor cooling system, which belongs to the technical field of air compressors and comprises a heat exchanger, a support frame and a fixed frame, wherein the fixed frame supports the support frame and the heat exchanger; the cooling system also comprises a first centrifugal fan, a second centrifugal fan, a first driving unit, a second driving unit and an air guide cover; the first driving unit and the second driving unit respectively drive the first centrifugal fan and the second centrifugal fan; the first centrifugal fan and the second centrifugal fan are opposite to the heat exchanger; the air compressor comprises an air compressor main machine and is characterized in that a temperature sensor used for detecting the exhaust temperature of the air compressor is arranged in the air compressor main machine, and a first driving unit and a second driving unit control the operation and the operation rotating speed of a first centrifugal fan and a second centrifugal fan according to the temperature of the air compressor main machine obtained by the temperature sensor. The utility model discloses a cooling system, with adopt the cooling of axial-flow fan the heat exchanger is compared, and the noise is littleer, and the cooling amount of wind that produces is more even.
Description
Technical Field
The utility model relates to an air compressor machine technical field especially relates to an air compressor machine cooling system.
Background
An axial flow fan (the direction of wind flow is parallel to the axis) and an aluminum plate-fin heat exchanger are commonly adopted as a cooling system of the air-cooled air compressor. The axial flow fan integrates all parts such as fan blades, a mesh enclosure, a motor and the like, and has the advantages of simplicity in assembly, high reliability, high cost performance and the like. However, the axial flow fan has a disadvantage that since the flow direction of the wind is parallel to the motor shaft, the cooling system has 2 layout modes: blowing and air suction, wherein cold air in a blowing mode firstly passes through an axial flow fan and then passes through a heat exchanger, and the heat exchanger has the advantages of good heat dissipation effect of a motor and the defects of uneven air volume distribution of cooling air passing through the heat exchanger and low utilization rate of the heat exchanger; the air suction mode is opposite, cold air firstly passes through the heat exchanger and then passes through the axial flow fan, the advantages are that the air volume distribution of the cooling air passing through the heat exchanger is uniform, the utilization rate of the cold air is high, the heat exchange effect is good, the defect is that the cold air is changed into hot air after passing through the heat exchanger, and the heat dissipation condition of the motor is obviously inferior to the air blowing mode.
The above are the respective advantages and disadvantages of 2 kinds of layout modes of the axial flow fan, and for a high-power air compressor (generally more than or equal to 90kW), the axial flow fan has an obvious disadvantage in both blowing and suction structures, and the fan has larger noise during operation. The motor that axial-flow fan was joined in marriage is generally 1500r/min, and the air compressor machine power is big more, and the heat transfer power that requires to reach is big more, except that the heat exchanger size grow, with its supporting axial-flow fan amount of wind also need improve, improves the amount of wind except promoting the static pressure (adjustment fan blade angle), and the fan blade diameter also needs the grow, and the noise of fan is also big more during the operation.
Disclosure of Invention
The above-mentioned not enough to prior art, the utility model aims to solve the technical problem that, provide an air compressor machine cooling system for solve the problem that prior art cavity press system cooling stability is poor, the noise is big and the energy consumption is high.
The technical scheme that the utility model adopts for solving the technical problems is an air compressor cooling system, which is used for cooling lubricating oil and compressed air in the air compressor, the air compressor is provided with an air compressor main machine, the cooling system comprises a heat exchanger, a supporting frame and a fixing frame, and the fixing frame supports the supporting frame and the heat exchanger; the cooling system also comprises a first centrifugal fan, a second centrifugal fan, a first driving unit, a second driving unit and an air guide cover; the first driving unit and the second driving unit respectively drive the first centrifugal fan and the second centrifugal fan; the first centrifugal fan and the second centrifugal fan are arranged in the support frame, the air guide cover is arranged in the support frame and the heat exchanger, and the air guide cover is communicated with the support frame and the heat exchanger, so that the first centrifugal fan and the second centrifugal fan are opposite to the heat exchanger; the air compressor main machine is provided with a temperature sensor for detecting the exhaust temperature of the air compressor, and the first driving unit and the second driving unit control the operation and the operation rotating speed of the first centrifugal fan and the second centrifugal fan according to the exhaust temperature of the air compressor main machine obtained by the temperature sensor.
Preferably, the first drive unit comprises a first inverter for controlling an operation state of a first permanent magnet motor for driving the first centrifugal fan and a first permanent magnet motor; the first permanent magnet motor sets the operating temperature range of the first centrifugal fan, and the first frequency converter sets the constant operating temperature of the first centrifugal fan; the first frequency converter controls the rotating speed of the first centrifugal fan according to the exhaust temperature of the main machine of the air compressor detected by the temperature sensor.
Preferably, the second driving unit comprises a second frequency converter and a second permanent magnet motor, the second frequency converter is used for controlling the running state of the second permanent magnet motor, and the second permanent magnet motor is used for driving the second centrifugal fan; the second permanent magnet motor sets the operating temperature range of the second centrifugal fan, and the second frequency converter sets the constant operating temperature of the second centrifugal fan; and the second frequency converter controls the rotating speed of the second centrifugal fan according to the exhaust temperature of the main machine of the air compressor detected by the temperature sensor.
Preferably, the air guide cover is provided with a first guide ring and a second guide ring which respectively correspond to the first centrifugal fan and the second centrifugal fan, and the first guide ring and the second guide ring are contracted from one end close to the heat exchanger to one end far away from the heat exchanger.
Preferably, a detachable maintenance closing plate is arranged on the side body of the air guide cover.
Preferably, the heat exchanger is rectangular; the support frame is cuboid, and the right surface of the support frame corresponds to the heat exchanger in proportion.
Preferably, a partition board is arranged in the support frame and separates the first centrifugal fan from the second centrifugal fan.
Preferably, the front surface and the rear surface of support frame are provided with the observation hole respectively, it has the observation shrouding to observe the hole coats, observe the shrouding for transparent glass or transparent plastics or panel beating.
Preferably, the support frame is provided with fixed connection board, be connected with first backup pad and second backup pad on the fixed connection board, first backup pad and second backup pad are fixed respectively first permanent-magnet machine and second permanent-magnet machine, first permanent-magnet machine and second permanent-magnet machine are in outside the support frame.
Preferably, the supporting frame is arranged in an open top mode.
The utility model discloses be provided with first centrifugal fan and second centrifugal fan to through lubricating oil and compressed air in the first centrifugal fan of drive and the centrifugal fan cooling air compressor machine of second, with adopting the axial-flow fan cooling the heat exchanger is compared, and the noise is littleer, and the cooling amount of wind that produces is more even, controls first permanent-magnet machine, second permanent-magnet machine and then control respectively through first converter and second converter the air compressor machine constant temperature operation can be guaranteed to first centrifugal fan and second centrifugal fan's rotational speed, does not receive ambient temperature to influence.
Drawings
Fig. 1 is a schematic perspective view of the cooling system of the air compressor in this embodiment.
Fig. 2 is a schematic perspective view of fig. 1 from another angle.
Fig. 3 is an exploded view of the cooling system of the air compressor in the embodiment.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Referring to fig. 1 to 3, the present invention discloses an air compressor cooling system, which includes a heat exchanger 100, a supporting frame 200 and a fixing frame 300, wherein the fixing frame 300 supports the supporting frame 200 and the heat exchanger 100; the cooling system further comprises a first centrifugal fan 10, a second centrifugal fan 20, a first driving unit 30, a second driving unit 40 and an air guide cover 50; the first and second driving units 30 and 40 respectively drive the first and second centrifugal fans 10 and 20; the first centrifugal fan 10 and the second centrifugal fan 20 are arranged in the support frame 200, the wind scooper 50 is arranged in the support frame 200 and the heat exchanger 100, and the wind scooper 50 is communicated with the support frame 200 and the heat exchanger 100, so that the first centrifugal fan 10 and the second centrifugal fan 20 are opposite to the heat exchanger 100; the air compressor main machine is provided with a temperature sensor for detecting the exhaust temperature of the air compressor, and the first driving unit 30 and the second driving unit 40 control the operation and the operation rotating speed of the first centrifugal fan 10 and the second centrifugal fan 20 according to the exhaust temperature of the air compressor main machine obtained by the temperature sensor.
In the prior art, an axial flow fan (the direction of the wind is parallel to the axis) is commonly used in combination with the aluminum plate-fin heat exchanger 100 as a cooling system in the air-cooled air compressor. However, the axial flow fan has a significant disadvantage that because the flow direction of the wind is parallel to the motor shaft, the cooling system has two layout modes: blowing and air suction, for a high-power air compressor (generally more than or equal to 90kW), an axial flow fan has an obvious defect in a blowing and air suction structure, and the noise of the fan is high during operation. The motor that axial-flow fan was joined in marriage is generally 1500r/min, and the air compressor machine power is big more, and the heat transfer power that requires to reach is big more, except that 100 size grow of heat exchanger, and the axial-flow fan amount of wind rather than supporting also needs to improve, improves the amount of wind except promoting the static pressure (adjustment fan blade angle), and the fan blade diameter also needs the grow, and the noise of fan is also big more in the operation.
In this embodiment, the heat exchanger 100 is also cooled by an air cooling method, specifically, the heat exchanger 100 is divided into two areas, and the two areas in the heat exchanger 100 are cooled by the first centrifugal fan 10 and the second centrifugal fan 20, respectively, so as to cool lubricating oil and compressed air in the air compressor, and improve uniformity of cooling air volume on the heat exchanger 100.
In order to improve the efficiency of the cooling heat exchanger 100, in the present embodiment, the wind scooper 50 is provided, and the first wind guiding ring 52 and the second wind guiding ring 53 are fixed to the wind scooper 50, specifically, under the condition of the same cooling effect, the efficiency of the cooling heat exchanger 100 passing through the lubricating oil and the compressed air by the first centrifugal fan and the second centrifugal fan is higher compared with that of the axial flow fan; the centrifugal fan can cool a larger area in the heat exchanger 100, and the first wind guide ring 52 and the second wind guide ring 53 in the wind guide cover 50 guide the hot wind generated by the centrifugal fan and subjected to heat exchange in the heat exchanger 100.
In the present embodiment, the operation and the speed of operation of the first centrifugal fan 10 and the second centrifugal fan 20 are controlled by the first drive unit 30 and the second drive unit 40, respectively; the air compressor main machine is provided with a temperature sensor for detecting the exhaust temperature of the air compressor main machine, the temperature sensor sends detected temperature information to the air compressor controller, the air compressor controller sends instructions to the first driving unit 30 and the second driving unit 40 according to the temperature information, and the first centrifugal fan 10 and the second centrifugal fan 20 are controlled to operate and rotate at the speed through the first driving unit 30 and the second driving unit 40.
When the air compressor is just started, the temperature in the exhaust temperature of the main machine of the air compressor is not high, and the heat exchanger 100 does not need to be cooled by the first centrifugal fan 10 and the second centrifugal fan 20; the temperature of lubricating oil is higher and higher along with the continuous operation of air compressor machine, and the exhaust temperature of air compressor machine host computer is also higher and higher, and air compressor machine host computer exhaust temperature also rises gradually, and when exhaust temperature reaches a certain set temperature at first, just get into work with second centrifugal fan 10. Wherein, the temperature range of the first centrifugal fan 10 and the second centrifugal fan 20 is set in the first driving unit 30 and the second driving unit 40, when the exhaust temperature of the air compressor main machine is higher than the temperature range of the first centrifugal fan 10 and the second centrifugal fan 20, the temperature sensor sends the detected temperature information to the first driving unit 30 and the second driving unit 40, and drives the first centrifugal fan 10 and the second centrifugal fan 20 by the first driving unit 30 and the second driving unit 40, respectively, and cools the lubricating oil and the compressed air flowing through the heat exchanger 100 by the first centrifugal fan 10 and the second centrifugal fan 20; when the exhaust temperature in the air compressor is lower than the set temperature range, the first and second driving units 30 and 40 control the first and second centrifugal fans 10 and 20 to stop operating, respectively.
Specifically, the first driving unit 30 includes a first inverter 31 and a first permanent magnet motor 32, the first inverter 31 is configured to control an operation state of the first permanent magnet motor 32, and the first permanent magnet motor 32 is configured to drive the first centrifugal fan 10; the first permanent magnet motor 32 sets the temperature range of operation of the first centrifugal fan 10, and the first frequency converter 31 sets the constant operating temperature of the first centrifugal fan 10; the first frequency converter 31 controls the rotation speed of the first centrifugal fan 10 according to the temperature detected by the temperature sensor.
The second driving unit 40 comprises a second frequency converter 41 and a second permanent magnet motor 42, the second frequency converter 41 is used for controlling the operation state of the second permanent magnet motor 42, and the second permanent magnet motor 42 is used for driving the second centrifugal fan 20; the second permanent magnet motor 42 sets the temperature range of operation of the second centrifugal fan 20, and the second inverter 41 sets the constant operation temperature of the second centrifugal fan 20; the second frequency converter 41 controls the rotation speed of the second centrifugal fan 20 according to the temperature detected by the second temperature sensor.
When the first permanent magnet motor 32 and the second permanent magnet motor 42 synchronously operate at the same frequency, the first and second permanent magnet motors set the starting temperature of the first centrifugal fan to be 88 ℃, the stopping temperature to be 78 ℃, and the first and second frequency converters set the constant operating temperature to be 85 ℃; the controller of the air compressor receives temperature information transmitted by a temperature sensor arranged on the main machine, then converts the temperature information into a corresponding control instruction according to a set temperature parameter requirement, and transmits the control instruction to the first frequency converter 31 and the second frequency converter 41, and the first frequency converter 31 and the second frequency converter 41 adjust the running rotating speeds of the first centrifugal fan and the second centrifugal fan according to the received control instruction. When the air compressor is started, the compressed exhaust temperature gradually rises along with the starting time (if the environmental temperature is extremely low in winter and the exhaust temperature cannot rise to 88 ℃, then 2 centrifugal fans do not work), the first centrifugal fan and the second centrifugal fan synchronously start to operate (when the exhaust temperature reaches 88 ℃), the first centrifugal fan and the second centrifugal fan simultaneously operate at the same frequency to stabilize the exhaust temperature at 85 ℃, the first driving unit 30 and the second driving unit 40 reasonably distribute the working state (operation or stop) and the operation rotating speed (frequency) of the first centrifugal fan and the second centrifugal fan according to the set parameter requirements, and therefore the constant-temperature operation of the air compressor can be guaranteed, and the economical and energy-saving operation state of the centrifugal fans can be guaranteed.
When the first permanent magnet motor 32 and the second permanent magnet motor 42 operate at different synchronous frequencies: setting a reasonable operating temperature range: the first permanent magnet motor 32 (driven by the first frequency converter 31) sets the starting temperature of the first centrifugal fan 10 to be 85 ℃, the stopping temperature to be 75 ℃ and the constant running temperature to be 82 ℃; the second permanent magnet motor 42 (driven by the second frequency converter 41) sets the second centrifugal fan 20 start temperature 89 ℃, stop temperature 83 ℃ and constant operating temperature 86 ℃. The controller of the air compressor receives temperature information transmitted by a temperature sensor arranged on the host machine, then converts the temperature information into a corresponding control instruction according to a set temperature parameter requirement and transmits the control instruction to the first frequency converter and the second frequency converter, and the first frequency converter and the second frequency converter adjust the running speed of the centrifugal fan or are in a non-running state according to the received control instruction.
The exhaust temperature of the air compressor gradually rises along with the starting time (if the environmental temperature is extremely low in winter and the exhaust temperature cannot rise to 85 ℃, the first centrifugal fan and the second centrifugal fan do not work), firstly, the first centrifugal fan 10 starts to operate (when the exhaust temperature reaches 85 ℃), if the first centrifugal fan 10 works, the exhaust temperature is stabilized at 82 ℃ or the first centrifugal fan 10 runs at full rotation speed (frequency), and the exhaust temperature does not rise to 89 ℃, then the second centrifugal fan 20 is in a stop state all the time; if the first centrifugal fan 10 enters a full-rotating-speed (frequency) operation state, the exhaust temperature still rises, when the temperature rises to 89 ℃, the second centrifugal fan 20 also enters into operation, the first centrifugal fan and the second centrifugal fan work simultaneously to stabilize the exhaust temperature in a reasonable range, and the first frequency converter and the second frequency converter can reasonably distribute the operating state (operation or stop) and the operating rotating speed (frequency) of the first centrifugal fan and the second centrifugal fan according to set parameter requirements, so that the constant-temperature operation of the air compressor can be ensured, and the economic and energy-saving operation state of the centrifugal fans can be ensured.
The process of stabilizing the exhaust temperature at 85 ℃ or 82 ℃ is as follows:
the temperature sensor detects the exhaust temperature of the air compressor main machine, when the exhaust temperature is higher than 85 ℃, the temperature sensor sends the detected temperature to the air compressor controller, the air compressor controller sends a speed increasing instruction to the first frequency converter 31 and the second frequency converter 41, and the first frequency converter 31 and the second frequency converter 41 control the rotating speed of the first centrifugal fan 10 and the rotating speed of the second centrifugal fan 20 by controlling the first permanent magnet motor 32 and the second permanent magnet motor 42. When the exhaust temperature is lower than 85 ℃, the temperature sensor sends the detected temperature to the air compressor controller, the air compressor controller sends a speed reduction instruction to the first frequency converter 31 and the second frequency converter 41, and the first frequency converter 31 and the second frequency converter 41 control the speed reduction of the first centrifugal fan 10 and the second centrifugal fan 20 by controlling the first permanent magnet motor 32 and the second permanent magnet motor 42.
The air guide cover is provided with a first guide ring 52 and a second guide ring 53 which respectively correspond to the first centrifugal fan 10 and the second centrifugal fan 20, and the first guide ring 52 and the second guide ring 53 are contracted from one end close to the heat exchanger 100 to one end far away from the heat exchanger 100.
The side body of the wind scooper is provided with a detachable maintenance sealing plate 51, in this embodiment, the maintenance sealing plate 51 is used for facilitating maintenance, and the maintenance sealing plate 51 can be detached regularly to maintain the inside of the wind scooper.
The heat exchanger 100 is rectangular; the supporting frame 200 is rectangular, and the right surface of the supporting frame 200 corresponds to the heat exchanger 100 in proportion. In this embodiment, the first and second centrifugal fans are disposed in the supporting frame 200, and the heat exchanger 100 is an aluminum plate-fin heat exchanger 100 in order to match the shape of the rectangular heat exchanger 100.
The supporting frame 200 is provided with a partition plate 220, the partition plate 220 separates the first centrifugal fan 10 from the second centrifugal fan 20, and the partition plate 220 can avoid the interference of the first centrifugal fan 10 and the second centrifugal fan 20.
The front surface and the rear surface of support frame 200 are provided with the observation hole respectively, it has observation shrouding 210 to observe the hole coats, observe shrouding 210 and be transparent glass or transparent plastics or panel beating.
The support frame 200 is provided with a fixed connection plate 230, the fixed connection plate 230 is connected with a first support plate 231 and a second support plate 232, the first support plate 231 and the second support plate 232 are respectively fixed with the first permanent magnet motor 32 and the second permanent magnet motor 42, and the first permanent magnet motor 32 and the second permanent magnet motor 42 are arranged outside the support frame 200.
The supporting frame 200 is arranged in an open top manner, and the supporting frame 200 discharges the first centrifugal fan 10 and the second centrifugal fan 20 through the open top.
The utility model discloses be provided with first centrifugal fan 10 and second centrifugal fan 20 to through lubricating oil and the compressed air in the first centrifugal fan 10 of drive and the cooling of second centrifugal fan 20 flow through heat exchanger 100, with adopt the axial-flow fan cooling heat exchanger 100 compares, and the noise is littleer, and the cooling amount of wind of production is more even, controls first permanent-magnet machine 32, second permanent-magnet machine 42 and then control respectively through first converter 31 and second converter 41 the air compressor machine constant temperature operation can be guaranteed to first centrifugal fan 10 and second centrifugal fan 20's rotational speed, does not receive ambient temperature to influence.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The cooling system of the air compressor is used for cooling lubricating oil and compressed air in the air compressor, the air compressor is provided with an air compressor main machine, the cooling system comprises a heat exchanger, a supporting frame and a fixing frame, and the fixing frame supports the supporting frame and the heat exchanger; the method is characterized in that: the cooling system also comprises a first centrifugal fan, a second centrifugal fan, a first driving unit, a second driving unit and an air guide cover; the first driving unit and the second driving unit respectively drive the first centrifugal fan and the second centrifugal fan; the first centrifugal fan and the second centrifugal fan are arranged in the support frame, the air guide cover is arranged between the support frame and the heat exchanger, and the air guide cover is communicated with the support frame and the heat exchanger, so that the first centrifugal fan and the second centrifugal fan are opposite to the heat exchanger; the air compressor main machine is provided with a temperature sensor for detecting the exhaust temperature of the air compressor, and the first driving unit and the second driving unit control the operation and the operation rotating speed of the first centrifugal fan and the second centrifugal fan according to the exhaust temperature of the air compressor main machine obtained by the temperature sensor.
2. The air compressor cooling system according to claim 1, wherein the first driving unit includes a first inverter for controlling an operation state of a first permanent magnet motor for driving the first centrifugal fan and a first permanent magnet motor; the first permanent magnet motor sets the operating temperature range of the first centrifugal fan, and the first frequency converter sets the constant operating temperature of the first centrifugal fan; the first frequency converter controls the rotating speed of the first centrifugal fan according to the exhaust temperature of the main machine of the air compressor detected by the temperature sensor.
3. The air compressor cooling system as claimed in claim 2, wherein the second driving unit includes a second inverter for controlling an operation state of a second permanent magnet motor for driving the second centrifugal fan and a second permanent magnet motor; the second permanent magnet motor sets the operating temperature range of the second centrifugal fan, and the second frequency converter sets the constant operating temperature of the second centrifugal fan; and the second frequency converter controls the rotating speed of the second centrifugal fan according to the exhaust temperature of the main machine of the air compressor detected by the temperature sensor.
4. The cooling system of the air compressor as claimed in claim 1, wherein the air guiding cover is provided with a first guiding ring and a second guiding ring corresponding to the first centrifugal fan and the second centrifugal fan respectively, and the first guiding ring and the second guiding ring are tapered from one end close to the heat exchanger to one end far away from the heat exchanger.
5. The cooling system of claim 1, wherein the side of the air guiding hood is provided with a removable maintenance closing plate.
6. The air compressor cooling system according to claim 1, wherein the heat exchanger is rectangular; the support frame is cuboid, and the right surface of the support frame corresponds to the heat exchanger in proportion.
7. The cooling system of claim 1, wherein a partition is disposed in the support frame, and the partition separates the first centrifugal fan from the second centrifugal fan.
8. The cooling system of claim 1, wherein the front surface and the rear surface of the supporting frame are respectively provided with an observation hole, the observation hole is covered with an observation sealing plate, and the observation sealing plate is made of transparent glass, transparent plastic or metal plate.
9. The air compressor cooling system according to claim 2, wherein the supporting frame is provided with a fixed connection plate, a first supporting plate and a second supporting plate are connected to the fixed connection plate, the first permanent magnet motor and the second permanent magnet motor are respectively fixed to the first supporting plate and the second supporting plate, and the first permanent magnet motor and the second permanent magnet motor are located outside the supporting frame.
10. The cooling system of the air compressor as claimed in claim 1, wherein the supporting frame is open-topped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962015.0U CN211288028U (en) | 2019-11-13 | 2019-11-13 | Air compressor machine cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921962015.0U CN211288028U (en) | 2019-11-13 | 2019-11-13 | Air compressor machine cooling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211288028U true CN211288028U (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921962015.0U Active CN211288028U (en) | 2019-11-13 | 2019-11-13 | Air compressor machine cooling system |
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| CN (1) | CN211288028U (en) |
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2019
- 2019-11-13 CN CN201921962015.0U patent/CN211288028U/en active Active
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