| 摘要 |
<p>The present invention relates to commercial upright type refrigerators. Generally, the frame structure and the door frames are made of metal because of the durability and appearance of that material and the ease with which it may be manufactured. Most metals, however, are superior conductors of heat. It has become the practice to provide a submerged electrical heating wire located within the door mounting frame structure which, when supplied with electrical current generates a small amount of heat, adequate to prevent condensation. The heater wires do not consume a large amount of energy relative to the total energy consumed by most refrigerators, nevertheless it is desirable to conserve energy by providing a door frame mounting structure which is thermally as efficient as possible. The present invention utilizes a thermal barrier between the cold portion and the warm portion of the frame in combination with a divided thermal conduction path extending from an intermediate portion into the cold portion. The divided path comprises a thick load-bearing section through which conduction is impeded by the thermal barrier, in parallel with a thinner sealing face plate section exposed to the air outside the refrigerator and electrically heated to prevent condensation. In this way condensation is prevented and the heat load on the refrigerator is minimized.</p> |
