Doubly-fed wind generator slip ring chamber cooling structure

Abstract

The invention relates to a doubly-fed wind generator slip ring chamber cooling structure. The cooling structure comprises a shell with a polygonal longitudinal section, an air inlet window is fixedly installed on the lateral lower portion of the shell, a first air guide plate and a second air guide plate are installed on the inner side of the air inlet window, an air channel is formed between the first air guide plate and the second air guide plate, and a first cover plate is fixedly installed on the lateral upper portion of the shell. A third air guide plate is installed on the inner side of the first cover plate, the front edge of the third air guide plate partially extends into the brush frame of the sliding ring chamber, a back plate is fixedly installed on the rear end face of the shell, an air outlet hole is formed below the back plate, and a cooling medium circulation air path is formed among the first air guide plate, the second air guide plate, the third air guide plate, the sliding ring and the brush frame. According to the slip ring chamber cooling structure, the air guide plates are effectively combined with the brush frame ring plate and the slip ring to form a tight air path structure, so that most of the cooling medium flows through the surfaces of each group of carbon brushes and slip rings and does not flow in the peripheral space between the brush holder and the slip ring chamber shell, and the temperature of the slip rings and the carbon brushes is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind power generators, and relates to a cooling structure for a double-fed wind power generator slip ring chamber. Background technique [0002] The doubly-fed wind turbine adopts a wound rotor structure. The rotor side is connected to the inverter through the slip ring brush frame. During operation, the friction between the slip ring and the carbon brush in the slip ring chamber will cause friction loss, and the contact between the carbon brush and the slip ring will cause friction loss. The voltage drop will cause electrical loss, and the heat generated by the loss will cause the temperature of the slip ring and carbon brush to rise. Excessive temperature will cause premature aging and damage to peripheral components. When the temperature trip limit is reached, it will cause shutdown. Therefore, we must think The method is to cool down the slip ring and carbon brush, and take away the generated heat in ...

AI Technical Summary

Problems solved by technology

[0002] The doubly-fed wind turbine adopts a wound rotor structure. The rotor side is connected to the inverter through the slip ring brush frame. During operation, the friction between the slip ring and the carbon brush in the slip ring chamber will cause friction loss, and the contact between the carbon brush and the slip ring will cause friction loss. The voltage drop will cause electrical loss, and the heat generated by the loss will cause the temperature of the slip ring and carbon brush to rise. Excessive temperature will cause premature aging and damage to peripheral components. When the temperature trip limit is reached, it will cause shutdown. Therefore, we must think Ways to cool slip rings and carbon brushes, and take away the generated heat in time

[0003] The existing technical solutions generally use air cooling, one is to install an independent cooling fan on the cover plate of the slip ring chamber to blow air into the slip ring chamber, which increases the cost, increases the electrical wiring, and the wind field control strategy, and the toner blowing caused by it is difficult to clean up and requires maintenance. Trouble; the other is that a fan that rotates with the shaft is installed on the generator shaft, and an air inlet is left on the side plate of the slip ring chamber. The suction generated by the fan continuously draws in the cold air at the air inlet of the slip ring chamber. The hot air flows through the slip ring brush holder, and then exhausts the hot air from the other side of the fan. As the power of the double-fed wind turbine increases, on the one hand, the mechanical loss and electrical loss caused by the slip ring and carbon brush increase. The increase in the number of groups of carbon brushes results in more attachments to the slip ring brush holder and increased wind resistance, which makes the cooling medium flow in the outer peripheral space cavity formed between the brush holder and the slip ring chamber shell, causing the slip ring with the most serious heat to rub against the carbon brush Surface cannot be effectively cooled, the temperature is too high

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