| 摘要 |
PURPOSE: To provide the cooling device of a power distribution panel having a good cooling efficiency and an improved operation reliability. CONSTITUTION: An inverter device 7 is arranged in a wind tunnel 5. The inverter device 7 is constituted of, for example, a transistor 7A and the transistor 7A is mounted on a cooling fin 7B. Temperature relays 8 and 9 are also mounted on the cooling fin 7B. A push-in fan 6 and a suction fan 10 are installed at the entrance and exit sides of the wind tunnel 5, respectively, and the operation is switched by operating the temperature relay 9. A flow-dividing path is provided at an exhaust exit, the suction fan 10 is provided at one exhaust path, and a movable plate 11 closing when the suction fan 10 operates is installed at an exhaust path directly leading to the outside of a power distribution panel. When the capacity of the push-in fan 6 decreases, the suction fan 10 is switched on to maintain an expected cooling capacity. |
