CN101610661A - Liquid-cooled fully sealed high-efficiency radiating electronic cabinet - Google Patents
Liquid-cooled fully sealed high-efficiency radiating electronic cabinet Download PDFInfo
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- CN101610661A CN101610661A CN 200810094045 CN200810094045A CN101610661A CN 101610661 A CN101610661 A CN 101610661A CN 200810094045 CN200810094045 CN 200810094045 CN 200810094045 A CN200810094045 A CN 200810094045A CN 101610661 A CN101610661 A CN 101610661A
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- 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
- H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
- H05K7/20609—Air circulating in closed loop within cabinets wherein heat is removed through air-to-liquid heat-exchanger
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- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The present invention relates to a kind of heat dissipation technology that is applied to the totally-enclosed electronic cabinet, particularly be applied to the heat dissipating method and the heat abstractor of high-power electronic device of the need totally-enclosed of outdoor adverse circumstances.The present invention adopts the liquid circulation cooling device, the heat that cooling fluid produces when working by the liquid cooling heat radiator absorbed power element that is arranged at main frame inside, and be transported in the outside high-efficiency radiator of main frame by the cooling fluid that recycle liquid pump will absorb heat, the blower fan of high-efficiency radiator is implemented forced air cooling to it, to realize the purpose of high efficiency and heat radiation.Wherein, main frame adopts totally-enclosed casing structure, to realize the purpose of waterproof, protection against the tide, dustproof and electromagnetic shielding.Adopt the device of this heat dissipation technology, have that power is big, volume is little, easy temperature control system, noise is low, cost is low, the heat exchange efficiency advantages of higher.
Description
Technical field
The present invention relates to the heat dissipation technology and the heat abstractor of the totally enclosed electronic equipments cabinet of a kind of needs, the heat dissipating method of particularly a kind of waterproof that is used for the powerful electronic equipment of outdoor or other adverse circumstances, protection against the tide, dustproof, electromagnetic shielding cabinet and use the heat abstractor of this method.
Background technology:
Along with the develop rapidly of markets such as Digital Television, mobile communication and technology, the electronic equipment that is operated in open air or other adverse circumstances is more and more paid close attention to by the user, as in, low power transmitter, transponder, base station, repeater etc.Be operated in outdoor just can more close required overlay area, reduced the power demand of equipment, do not need to build machine room, reduce networking cost greatly, the energy has been saved in the minimizing electromagnetic pollution, helps environmental protection.
These electronic equipments that are operated in outdoor and other adverse circumstances have higher demand to waterproof, protection against the tide, dustproof, electromagnetic shielding, require to be operated in the airtight cabinet environment.The electronic equipment of work in the closed case, because a large amount of heat-generating electronic elements produces very high heat, general power is big more, the dissipation energy that produces is just big more, temperature in the cabinet is just high more, and temperature is high more, and also can with the rising of temperature drift about with regard to short more, working point parameter the useful life of electronic component, and Performance And Reliability will sharply descend.Therefore, the heat radiation of the electronic equipment of work just becomes a very crucial technology in the closed case.
These traditional electronic equipments generally are as cabinet with a cast aluminium shell, the cast aluminium shell is cast with fin dress radiation tooth, or makees backboard with a very big radiator, surrounds a closed case with metallic plate, heat-generating electronic elements is fixed on the radiator, by natural air cooled the heat radiation.This heat dissipating method has significant limitation, and the one, bulky, very heavy; The 2nd, power is little, and adopting overall dimensions as digital television repeater is 600mm*420mm*210mm, the cast aluminium cabinet of 22Kg, and power output 20W, ambient temperature are in the time of 25 ℃, and the maximum temperature at shell fin place has reached 45 ℃.
In view of the defective that exists in the above-mentioned known technology, inventor's foundation working experience for many years, Computer Simulation and experiment through a large amount of have proposed the present invention.
Summary of the invention:
Technical problem to be solved by this invention is, require waterproof, protection against the tide, dustproof, deficiency that the electromagnetic shielding cabinet exists at being operated in high-power electronic device in outdoor and other adverse circumstances, a kind of radiating effect that improves is provided, the useful life of improving the electronic equipment reliability of operation and improving electronic equipment, reduce the electronic equipment volume, make it miniaturization, microminiaturization, be convenient to processing, the heat abstractor of the heat dissipating method of the high-power electronic device that cost is low and this method of use.
Above-mentioned technical problem of the present invention is realized by following technical scheme.
A kind of heat dissipation technology that is applied to the totally-enclosed electronic cabinet particularly is applied to the heat dissipating method and the heat abstractor of high-power electronic device of the need totally-enclosed of outdoor adverse circumstances.Adopt the liquid circulation cooling device, cooling fluid is the heat that produces by the liquid cooling inner radiator absorbed power element work that is arranged at totally-enclosed electronics mainframe box inside, and be transported in the outer heat abstractor of main frame outside by the cooling fluid that recycle liquid pump will absorb heat, the blower fan of outer heat abstractor is implemented forced air cooling to it, to realize the purpose of high efficiency and heat radiation, wherein, main frame adopts totally-enclosed casing structure, with realize preventing dust, the purpose of waterproof.
Described high-power electronic device heat dissipating method is characterized in that: the liquid-solid phase point of the cooling fluid in the described circulation fluid cooling device is not less than subzero 30 ℃, and boiling point is not less than 90 ℃.
Described high-power electronic device heat dissipating method is characterized in that: the cooling fluid in the described circulation fluid cooling device is 30%～60% the ethylene glycol aqueous solution, and adds certain proportion anticorrisive agent and stabilizer, also can adopt water or oil.
Described high-power electronic device heat dissipating method is characterized in that: described circulation fluid is by the described radiating tube radiator that studs with fin, through radiator fan forced air cooling heat radiation cooling.
Described outer heat abstractor comprises: annexes such as cooling fluid, water pump, outer radiator, radiator fan, expansion tank, water pipe are formed, and it is characterized in that:
Be provided with the circulation fluid passage in the described radiator;
Water pump pressurizes to cooling fluid, guarantees that it circulates in cooling system; Cooling fluid is by external interface, the internal pipeline inner radiator of flowing through; The large power, electrically sub-element is fixed on the inner radiator, and the heat that produces during work passes to cooling fluid in its pipeline by inner radiator, has absorbed the cooling fluid of heat, and radiator cools off outside return flow line and interface enter.
The expansion tank of described outer heat abstractor places the most significant end of outer radiator, comprising: compositions such as expansion tank, liquid injection port, expansion tube, overflow pipe, blowdown pipe, Liquid level scale.Cooling fluid is injected expansion tank and is full of whole loop through expansion tube through liquid injection port, and expansion tube links to each other with primary path, and the cooling fluid of expanded by heating is back to expansion tank through expansion tube; Overflow pipe is used to discharge the unnecessary cooling fluid that surpasses predetermined water level in the expansion tank; When being used to safeguard, blowdown pipe gets rid of cooling fluid; Liquid level scale can be estimated liquid level.
Heat abstractor in the high-power electronic device according to claim 5, it is characterized in that: described radiator is rectangle radiating tube or square-outside and round-inside radiating tube, and described high-power electronic device is fixedly arranged on the outer surface of described radiating tube; The radiating tube of described formation radiator is a plurality of, is connected to become the series connection coil-type radiator with the U-shaped pipe to each other; Or two ends are connected to become the multitube parallel radiator with many siphunculus; The endoporus of described radiating tube is provided with longitudinal fin.
Described totally-enclosed electronics mainframe box adopts the full-closed structure design, adopts rubber weather strip to wrap up in metallic conduction net pressing sealing outward between machine box door and the cabinet, to realize the effect of geomantic omen, dustproof and electromagnetic shielding; Between cooling water pipe and the cabinet, and between I/O mouth, policing port, power port and the cabinet, adopt flange, rubber weather strip to wrap up in sealing and fixing such as metallic conduction net, screw, nut outward, to realize the effect of geomantic omen, dustproof and electromagnetic shielding.
The invention has the advantages that:
Adopt liquid cooling that the high-power electronic device that needs are operated in the closed case is cooled off, have that volume is little, easy temperature control system, noise is low, cost is low, advantage such as heat exchange efficiency height, power are big.
In order to illustrate method of the present invention, apparatus structure, effect better, enumerate specific embodiment now and also be described in detail in conjunction with the accompanying drawings.
Description of drawings
The totally-enclosed high efficiency and heat radiation cabinet of Fig. 1 liquid-cooled schematic diagram.
The outer radiator overall pattern of Fig. 2.
The outer radiator body figure of Fig. 3
Fig. 4 expansion tank
Fig. 5 inner radiator
Heating panel in Fig. 6
Fig. 7 full-closed electronic main frame
Embodiment
The present invention is to provide a kind of full-closed electronic cabinet that needs waterproof, protection against the tide, dustproof and electromagnetic shielding and heat dissipating method and heat abstractor, this method and apparatus adopts full-closed electronic cabinet main frame and the separate formula method for designing of external heat sink cabinet, so that realize the totally-enclosed of electronic cabinet main frame; Heat-generating electronic elements is fixed on the inner radiator of main frame inside, inner radiator is to be made by the metal material of high-termal conductivity such as aluminium, copper etc., the heat that produces is exported in the outer radiator by the circulation fluid cooling of inner radiator inside and cools off, with the purpose of realization high efficiency and heat radiation.
The liquid-solid phase point of the cooling fluid in the described circulation fluid cooling device is not less than subzero 20 ℃, and boiling point is not less than 90 ℃.Thereby reach the operating temperature range of control cooling fluid, avoid Yin Wendu to cross low or too high and cause component failure.Specifically be to adopt 30%～60% the ethylene glycol aqueous solution, and adding certain proportion anticorrisive agent and stabilizer, adopt 30%～60% the ethylene glycol aqueous solution, and add the certain proportion anticorrisive agent and stabilizer is done cooling fluid, can reduce the corrosion of cooling fluid, prolong the useful life of cooling system the metal surface.
Described circulating cooling liquid cools off by the air blast cooling of described outer radiator.
The present invention also provides a kind of and adopts the full-closed electronic cabinet of above-mentioned heat dissipating method and be the device of this case radiation.Fig. 1 is the structural representation of full-closed electronic cabinet of the present invention and heat abstractor.As shown in the figure, full-closed electronic cabinet of the present invention and heat abstractor comprise; Full-closed electronic cabinet main frame 1.1 and outer radiator 1.2.
Described full-closed electronic cabinet main frame comprises casing 7.1, inner radiator 7.2, shield gasket bar 7.3, door 7.4 compositions as shown in Figure 7.
Described inner radiator as shown in Figure 5, comprise circulating cooling liquid outlet 5.1, seal washer 5.2, circulating cooling liquid pipeline 5.3, interior heating panel 5.4, heat-generating electronic elements 5.5, flange 5.6, circulating cooling liquid inlet 5.7, and other electronic components that are contained on the circuit board are formed, circulating cooling liquid pipeline 5.3 is welded on the interior heating panel 5.4, formation, circulating cooling liquid pipeline, and can bear certain pressure, flange 5.6 is integrally welded with circulating cooling liquid pipeline 5.3.
Heating panel as shown in Figure 6 in described, interior heating panel 6.1 is made by metal alloy compositions such as copper, the aluminium etc. of high thermal conductivity, and have some through holes 6.2 at interior heating panel, in axial direction have the fin of triangle or other shapes on the through-hole wall, to increase area of dissipation.
Described outer radiator is made up of air inlet 2.1, outer radiator 2.2, motor 2.3, fan 2.4, shell 2.5 as shown in Figure 2.
Described outer radiator is made up of fin shape fin 3.1, metal tube 3.2, circulating cooling liquid inlet 3.3, expansion tank 3.4, recycle liquid pump 3.5, circulating cooling liquid outlet 3.6 as shown in Figure 3.
Described expansion tank is made up of circulating cooling liquid liquid injection port 4.1, expansion tank 4.2, Liquid level scale 4.3, expansion tube 4.4, overflow pipe 4.5, blowdown pipe 4.6 as shown in Figure 4.
Operation principle:
Heat-generating electronic elements 5.5 produces a large amount of heats when work, on the interior heating panel 5.4 that heat is made by high heat conduction (as copper, aluminium alloy), interior heating panel conducts heat to the cooling fluid that circulates in vivo again, the cooling fluid that has absorbed heat has circulation to tuck in pump the metal tube 3.2 in the outer radiator of flowing through of exerting pressure, metal tube conduct heat to it closely contact by on the fin shape fin 3.1, motor 2.3 drives fan 2.4 and rotates, metal tube 3.2 and fin shape fin 3.1 are carried out forced air cooling, to realize the purpose of heat radiation.
Described expansion tank 3.4 is used for storage and compensation cycle cooling fluid.When circulating cooling liquid during at expanded by heating, dilated unnecessary cooling fluid is back in the expansion tank 4.2 through expansion tube 4.4 in the pipeline; When the cooling fluid in the expansion tank 4.2 exceeded set liquid level, circulating cooling liquid was located through overflow pipe 4.5 rows; When equipment being safeguarded or change cooling fluid, open blowdown pipe 4.6 and seal old circulating cooling liquid discharge.
Electronics mainframe box 1.1 is bent by sheet metal and forms, and the seam crossing welding must not have the slit; Shield and seal with sealing rubber strip and wire netting between door and the casing; Be connected and sealed by flange, rubber gasket between inner radiator pipe and the cabinet, for waterproof, protection against the tide, the dustproof and electromagnetic shielding purpose that realizes the electronic cabinet main frame.
Claims (7)
1, a kind of heat dissipation technology that is applied to the totally-enclosed electronic cabinet particularly is applied to the heat dissipating method and the heat abstractor of high-power electronic device of the need totally-enclosed of outdoor adverse circumstances; Adopt the liquid circulation cooling device, cooling fluid is the heat that produces by the liquid cooling inner radiator absorbed power element work that is arranged at totally-enclosed electronics mainframe box inside, and be transported in the outer heat abstractor of main frame outside by the cooling fluid that recycle liquid pump will absorb heat, the blower fan of outer heat abstractor is implemented forced air cooling to it, to realize the purpose of high efficiency and heat radiation, wherein, main frame adopts totally-enclosed casing structure, to realize the purpose of waterproof, protection against the tide, dustproof and electromagnetic shielding.
2, the heat dissipating method of totally-enclosed electronic cabinet according to claim 1 is characterized in that: the liquid-solid phase point of the cooling fluid in the described circulation fluid cooling device is not less than subzero 30 ℃, and boiling point is not less than 90 ℃.
3, the heat dissipating method of totally-enclosed electronic cabinet according to claim 1, it is characterized in that: the cooling fluid in the described circulation fluid cooling device is 30%～60% the ethylene glycol aqueous solution, and add certain proportion anticorrisive agent and stabilizer, also can adopt water or oil.
4, the heat dissipating method of totally-enclosed electronic cabinet according to claim 1 is characterized in that: described circulation fluid is by the described radiating tube radiator that studs with fin, through radiator fan forced air cooling heat radiation cooling.
5, outer heat abstractor according to claim 1 comprises: annexes such as cooling fluid, water pump, outer radiator, radiator fan, expansion tank, water pipe are formed, and it is characterized in that:
Be provided with the circulation fluid passage in the described radiator;
Water pump pressurizes to cooling fluid, guarantees that it circulates in cooling system; Cooling fluid is by external interface, the internal pipeline inner radiator of flowing through; The large power, electrically sub-element is fixed on the inner radiator, and the heat that produces during work passes to cooling fluid in its pipeline by inner radiator, has absorbed the cooling fluid of heat, and radiator cools off outside return flow line and interface enter;
The expansion tank of described outer heat abstractor places the most significant end of outer radiator, comprising: compositions such as expansion tank, liquid injection port, expansion tube, overflow pipe, blowdown pipe, Liquid level scale.Cooling fluid is injected expansion tank and is full of whole loop through expansion tube through liquid injection port, and expansion tube links to each other with primary path, and the cooling fluid of expanded by heating is back to expansion tank through expansion tube; Overflow pipe is used to discharge the unnecessary cooling fluid that surpasses predetermined water level in the expansion tank; When being used to safeguard, blowdown pipe gets rid of cooling fluid; Liquid level scale can be estimated liquid level.
6, the heat abstractor of totally-enclosed electronic cabinet according to claim 5 is characterized in that: described radiator is rectangle radiating tube or square-outside and round-inside radiating tube, and described high-power electronic device is fixedly arranged on the outer surface of described radiating tube; The radiating tube of described formation radiator is a plurality of, is connected to become the series connection coil-type radiator with the U-shaped pipe to each other; Or two ends are connected to become the multitube parallel radiator with many siphunculus; The endoporus of described radiating tube is provided with longitudinal fin.
7, adopt the full-closed structure design according to the described totally-enclosed electronics of claim 1 mainframe box, adopt rubber weather strip to wrap up in metallic conduction net pressing sealing outward between machine box door and the cabinet, to realize the effect of geomantic omen, protection against the tide, dustproof and electromagnetic shielding; Between cooling water pipe and the cabinet, and between I/O mouth, policing port, power port and the cabinet, adopt flange, rubber weather strip to wrap up in sealing and fixing such as metallic conduction net, screw, nut outward, to realize the effect of geomantic omen, dustproof and electromagnetic shielding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810094045 CN101610661A (en) | 2008-06-20 | 2008-06-20 | Liquid-cooled fully sealed high-efficiency radiating electronic cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810094045 CN101610661A (en) | 2008-06-20 | 2008-06-20 | Liquid-cooled fully sealed high-efficiency radiating electronic cabinet |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105376966A (en) * | 2014-09-01 | 2016-03-02 | 宜昌迪森智能科技有限公司 | Dustproof electric appliance cabinet |
| CN106500034A (en) * | 2016-11-10 | 2017-03-15 | 武汉通畅汽车电子照明有限公司 | A kind of headlight for automobile heat abstractor and its heat dissipating method |
| CN106679245A (en) * | 2016-07-08 | 2017-05-17 | 长沙麦融高科股份有限公司 | Double-temperature mixed cold source air conditioner system based on heat pipe heat conduction |
| CN107193338A (en) * | 2017-04-25 | 2017-09-22 | 罗飞 | Space accounting small host computer and desktop computer |
| CN107498566A (en) * | 2017-10-10 | 2017-12-22 | 上海丞士机器人有限公司 | A kind of Intelligent lifesaving circle robot |
| CN107914025A (en) * | 2017-12-28 | 2018-04-17 | 南京信息职业技术学院 | Conduction cooling integral turning tool for dry cutting |
| CN108600799A (en) * | 2018-04-18 | 2018-09-28 | 深圳市奈士迪技术研发有限公司 | A kind of Intelligent Digital video transformation box with temperature with high efficiency function |
| CN108868994A (en) * | 2018-08-22 | 2018-11-23 | 南京世界村汽车动力有限公司 | A kind of engine cooling system |
| CN109041528A (en) * | 2018-08-20 | 2018-12-18 | 南京理工大学 | Electronic board between the high heatsink welding entrucking of integrated form |
| CN109640590A (en) * | 2018-12-28 | 2019-04-16 | 河南城建学院 | A kind of circulating water cooling system of electric power controller |
| CN110750141A (en) * | 2019-09-19 | 2020-02-04 | 中国船舶重工集团公司第七0七研究所 | Closed heat radiation structure of high-power magnetic disk array |
| CN112216901A (en) * | 2020-10-13 | 2021-01-12 | 陈良华 | Thermal expansion type anti-overheating automatic cooling safety battery pack |
| CN112648170A (en) * | 2020-12-31 | 2021-04-13 | 蒲友强 | Oilless air compression equipment |
| CN113131677A (en) * | 2021-04-17 | 2021-07-16 | 东营科技职业学院 | New energy automobile motor monitoring device that generates heat |
| CN114046249A (en) * | 2021-11-22 | 2022-02-15 | 力达（江西）机电有限公司 | Heat radiation assembly for air compressor |
| CN114115391A (en) * | 2021-10-13 | 2022-03-01 | 郑州德玛电气有限公司 | Embedded cabinet circulating temperature control system and use method |
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2008
- 2008-06-20 CN CN 200810094045 patent/CN101610661A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105376966A (en) * | 2014-09-01 | 2016-03-02 | 宜昌迪森智能科技有限公司 | Dustproof electric appliance cabinet |
| CN106679245A (en) * | 2016-07-08 | 2017-05-17 | 长沙麦融高科股份有限公司 | Double-temperature mixed cold source air conditioner system based on heat pipe heat conduction |
| CN106500034A (en) * | 2016-11-10 | 2017-03-15 | 武汉通畅汽车电子照明有限公司 | A kind of headlight for automobile heat abstractor and its heat dissipating method |
| CN107193338B (en) * | 2017-04-25 | 2020-10-23 | 罗飞 | Computer host and desktop computer with small space occupation ratio |
| CN107193338A (en) * | 2017-04-25 | 2017-09-22 | 罗飞 | Space accounting small host computer and desktop computer |
| CN107498566A (en) * | 2017-10-10 | 2017-12-22 | 上海丞士机器人有限公司 | A kind of Intelligent lifesaving circle robot |
| CN107914025A (en) * | 2017-12-28 | 2018-04-17 | 南京信息职业技术学院 | Conduction cooling integral turning tool for dry cutting |
| CN107914025B (en) * | 2017-12-28 | 2024-05-03 | 南京信息职业技术学院 | Conduction cooling integral turning tool for dry cutting |
| CN108600799A (en) * | 2018-04-18 | 2018-09-28 | 深圳市奈士迪技术研发有限公司 | A kind of Intelligent Digital video transformation box with temperature with high efficiency function |
| CN108600799B (en) * | 2018-04-18 | 2020-12-22 | 嘉兴市佳丝宝喷织股份有限公司 | Intelligent digital video conversion box with high-efficient cooling function |
| CN109041528B (en) * | 2018-08-20 | 2020-04-21 | 南京理工大学 | Integrated high-heat-dissipation electronic billboard for welding workshop |
| CN109041528A (en) * | 2018-08-20 | 2018-12-18 | 南京理工大学 | Electronic board between the high heatsink welding entrucking of integrated form |
| CN108868994A (en) * | 2018-08-22 | 2018-11-23 | 南京世界村汽车动力有限公司 | A kind of engine cooling system |
| CN109640590A (en) * | 2018-12-28 | 2019-04-16 | 河南城建学院 | A kind of circulating water cooling system of electric power controller |
| CN110750141B (en) * | 2019-09-19 | 2024-02-23 | 中国船舶重工集团公司第七0七研究所 | Airtight heat radiation structure of high-power disk array |
| CN110750141A (en) * | 2019-09-19 | 2020-02-04 | 中国船舶重工集团公司第七0七研究所 | Closed heat radiation structure of high-power magnetic disk array |
| CN112216901A (en) * | 2020-10-13 | 2021-01-12 | 陈良华 | Thermal expansion type anti-overheating automatic cooling safety battery pack |
| CN112216901B (en) * | 2020-10-13 | 2021-08-20 | 湖南盛利高新能源科技有限公司 | Thermal expansion type anti-overheating automatic cooling safety battery pack |
| CN112648170A (en) * | 2020-12-31 | 2021-04-13 | 蒲友强 | Oilless air compression equipment |
| CN113131677B (en) * | 2021-04-17 | 2022-07-05 | 东营科技职业学院 | New energy automobile motor monitoring device that generates heat |
| CN113131677A (en) * | 2021-04-17 | 2021-07-16 | 东营科技职业学院 | New energy automobile motor monitoring device that generates heat |
| CN114115391A (en) * | 2021-10-13 | 2022-03-01 | 郑州德玛电气有限公司 | Embedded cabinet circulating temperature control system and use method |
| CN114115391B (en) * | 2021-10-13 | 2023-01-31 | 郑州德玛电气有限公司 | Embedded cabinet circulating temperature control system and use method |
| CN114046249A (en) * | 2021-11-22 | 2022-02-15 | 力达（江西）机电有限公司 | Heat radiation assembly for air compressor |
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Open date: 20091223 |