Beijing Electric Power Equipment Factory 1 Overview Heat pipe cooling technology, the invention can be traced in 1942 to apply for and published in 1944, U.S. patent, and in fact was the first successful application of space technology in 1964, the United States, followed by the scientific community in the efforts of various countries, heat pipe technology in the theoretical design, manufacturing processes and application areas have made great development. Currently, as a mature cooling technology, the role of highly efficient heat pipe heat transfer device has been used widely in many industrial fields. 50 years from the last century in China by the Chinese Academy of Mechanics, and other units began to conduct research on this technology, and gradually developed a variety of heat pipe; 80 more units after China’s participation in the application of heat pipe technology, but also in the electronic industry, space technology energy projects in the field was successfully applied.
For the heat pipe cooling technology in the motor application has already been raised, and have achieved certain results, but also developed a number of smaller capacity motor prototype, but most work is still in a pilot study stage, from the practical application has some distance. Researchers or only made high-pressure heat pipe cooler motor feasibility research paper , or only prospect is briefly heat pipe cooling technology in the motor good prospects , but, as in  of 10 A few years ago in the article said in conclusion, “Heat Pipe Cooling of the motor is still in the experimental stage of exploration, testing electrical capacity are relatively small. to achieve the heat pipe in the motor cooling (especially medium and large motors) in industrial applications, also do a lot of theoretical research and experimental analysis. “When we carry out this” high-voltage motor development of heat pipe cooler “topic of research, development process, there is no precedent can be replicated, by our own design and manufacture of motor control base and the success of other industries experience heat pipe technology, relying on strong Liangxiang electrical power plant capacity built, entirely on their own get out a medium and large motor cooling technology, new road.
This end, we apply high voltage motor in large and medium heat pipe cooling technology for the exploratory experiments and applications.
2 medium-sized high-voltage motors in the power plant on the feasibility of application of heat pipe technology
2.1 traditional tube cooler problem
And medium-sized high-voltage electric motor cooling tube currently widely used out of water? Hollow or empty? Empty structure. Running water? Air type condenser is a cooling pipe in the cooling water through the motor in the pressure within the role of hot air flowing through the outer surface of cooling pipe, and tube heat exchange cooling water, cooling the motor to achieve the purpose; empty? Hollow cooler with water? air type condenser heat exchanger principle only, the cooling pipe in the cooling water into the cooling air only.
The use of a space? Air heat exchanger, the cold air cooled motor that is used outside the hot air, heated air through the tube, the cold air take the tube, the main problem is heat transfer area is small, a large flow resistance, cooling the weight of heavier device.
If the use of water? Air heat exchanger, the motor inside the hot air through the tube, the cooling water pipes go, it exists the original main question is:
use on copper pipe cooler for high, otherwise it will result in de-zinc brass corrosion, leading to leakage, water leakage into the motor will cause serious damage to motor accident;
demanding on the cooling water, if water is not clean or silt clog pipes, maintenance of large coolers, cooling tubes to be washed regularly brush and bucket, once the wear and tear caused water leakage into the motor, the Motor accidents cause serious damage;
As the water temperature is low, it is vulnerable to the local wall temperature below the dew point temperature of the air motors, condensate entrained in the air, it will damage the motor insulation.
2.2 uses the heat pipe air cooler advantages
Heat pipe cooler and cooler of the two traditional principles of different heat transfer, using the change of state of the cooling medium heat effect theory, that the cooling liquid into a gaseous medium required by the absorption of heat from the gas changes into a liquid when heat is released. This is a cool new way opened up for the motor cool new way.
Heat pipe cooler instead of the conventional tube-type cooler, will have the following advantages.
A) For the Air? Air heat exchanger:
use the high heat transfer performance of heat pipe, the cold air is converted to heat transfer outside tube heat transfer, making it easy expansion
Heat transfer area, thus reducing the size and weight of the cooler;
Pipe outer flow resistance. B) for water? Air heat exchanger:
Each tube is not water-pipe flow, and in the heat pipe? End of the outflow pipe, a good seal as long as the diaphragm, to prevent water leakage into the motor;
Heat pipes are independent of each heat transfer element, even though water will wear damage, the water will not leak to the air side, which can guarantee the safe operation of the motor, and a small number of heat pipe failure will not the performance of the equipment have any effect. Unlike the tube-type cooler, once leakage, must stop processing;
design and adjustable heat pipe surface temperature, in order to maintain the circulation of air above the dew point temperature to prevent condensation water droplets in the air to ensure the electrical insulation requirements.
2.3 Heat pipe air cooler for motor problems to be solved
As large motor equipment requirements must ensure that security, stability, operation, design and production of heat pipe must meet the stringent reliability requirements.
Heat pipe cooler in the application of high voltage motors, the main technical difficulty is the heat pipe type, materials, technology, size and other design parameters of the calculation and selection, and the actual construction of the modification required in the original motor tube cooler modification of space on the cooling effect should in principle be better than the original cooler, but also take into account such factors as cost control, saving money as much as possible.
From the current heat pipe technology point of view, both the air? Air heat exchanger or water? Air heat exchanger, the design should say more mature, more complete engineering design parameters. From our grasp of the heat pipe technology situation, alternative types of heat pipes, including pipe and working fluid, is able to meet our design requirements.
To ensure long-term reliable electrical work, heat pipe material and the choice of working fluid and the production quality of the detection process, the need for strict control and can not stay hidden quality.
Cooler design capacity, in considering the cooling effect of not less than the original
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