Test chambers PERFORMANCE large products, operating at low temperatures

摘要

The invention relates to test engineering, namely to the test chambers for bulky articles that operate at low temperatures. Camera proposed for testing operability of large products, operating at low temperatures, comprising a liquid coolant supply conduits with a shutoff valve, a device for uniform distribution of refrigerant and instrumentation that provide test process. The novelty of the proposed chamber is that the apparatus for the uniform distribution of refrigerant is in the form of upper and lower row of trays disposed relative to each other with the opposite slope 1,5-15 ° relative to the horizon and suspended by fixing the perimeter of the test article in the region 500-600 mm from its surface. experienced workers trials were conducted large-sized products, operating at low temperatures in the proposed cell. Tests have shown that the refrigerant evaporates intensively with bunk trays and; gently displaces the warm air upwards; uniform (soft) refrigerant supply eliminates turbulent flow and, as a consequence, admixing of warm air. Application structure bunk trays spaced at 500-600 mm from the surface of the article allows for smooth cover product coming refrigerant that eliminates surface damage of the test product when in contact with the refrigerant. Variation trays slope angle of 1.5 to 15 ° enables to select (change) of cooling the camera mode changing inclination angle: angle of slope at high - more refrigerant flow of cooling speed or higher; respectively, at a smaller angle of slope - lower rate of cooling. In general, the proposed test chamber construction provides a large-sized cooling the article to a temperature of -50 ° for 5 hours from the temperature difference at the ends of articles ± 2 ° C.