| 摘要 |
<p>PURPOSE:To obtain a low-cost and easily-maintained heat insulating device by partitioning a heat insulation box into two chambers and by providing a reversible fan and a unidirectional rotating fan to a distribution part between both the chamber and a filter to another distribution part between both the chambers and the air. CONSTITUTION:When an electronic equipment 15 is not in operation and heat insulation is necessary because of the cold air, the contact of a low-temperature detection switch (SW)11 is closed, and a reversible fan 22 turns counterclockwise to suck air into a chamber wherein the equipment 15 is installed, sending an air flow straightened by straightening vanes 17 and 18 to a unidirectional rotating fan 23. With the SW11 closed, the fan 23 turns clockwise to distribute the air from the fan 22 to a suction heater 10. A hot wind passed through the heater 10 is sent to the equipment 15 side via a straightening vane 19 and sucked by the fan 22 via a straightening vane 20 to circulate. When the temperature in the heat insulation box 1 rises up to a prescribed temperature, the SW11 is opened to turn off the fans 22 and 23 and heater 10, holding the inside of the box at a required temperature. As the temperature rises owing to the operation of the electronic equipment, the high-temperature SW12 is closed to turn the fans 22 and 23 clockwise, and the outside air flows in via the filter 21 while the inside air is exhausted via the filter 24.</p> |
