The heat dissipation problem of frequency converter in underground room has become a key consideration

by:V&T Technologies     2019-11-15
The installation system of the shaft encoder uses two sets of high-speed and low-speed shaft encoders to monitor the running speed and running position of the winch. (A) The high-speed shaft encoder is installed at the non-shaft extension end of the motor: since there is no output shaft at the back end of the motor, we have adopted the method of opening holes on the rear end cover and installing a transition shaft, the transition shaft and shaft encoder are connected by a plastic elastic coupling. In this way, the system vibration problem caused by the different transition axes is avoided, and at the same time, the shaft encoder can be prevented from being damaged due to the large swing of the transition axes; (B) The low-speed shaft encoder is installed on the upper end of the pointer drive screw of the mechanical archway depth indicator. Due to the high position of the upper end of the lead screw and the inconvenience of mechanical drilling, we use the clamp coupling to connect the encoder with the lead screw. The shaft encoder is installed in this position, simple and reliable, does not destroy the original mechanical structure, and has the failure protection function of the depth indicator. The heat dissipation inverter of the inverter continuously generates heat while providing variable frequency power supply. It is a large heat source, and the heating power can generally reach about 3 of its output power. The temperature is too high, which not only causes damage to the inverter itself, but also affects the normal operation of other equipment on site. Wangzhuang mine main shaft lifting machine room, for the upper and lower double-layer structure, the upper layer is equipped with hoist, reducer, motor, etc. and driver console. The lower layer is a semi-basement structure. Due to the limitation of the upper layer space, the inverter can only be installed in the basement. The problem of heat dissipation of frequency converters in underground rooms has become one of the key considerations. A total of two options were considered: one was to install a high-power air conditioner in the basement to cool the indoor air; The second is on the basement side wall (Inverter rear position) Open the hole and drain the heat of the inverter directly to the outside. Considering that there are no personnel working in the basement, the installation of air conditioning costs and waste of energy, we adopted scheme 2: five ventilation holes were excavated on the side wall of the basement, and according to the size of the exhaust air outlet of the frequency converter, homemade exhaust duct; The inverter adopts the forced air cooling mode, comes with the cooling fan, is installed under the inverter cabinet, and uses the cooling fan provided by the inverter to directly discharge the hot air generated by the inverter to the outside.
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