Application of vacuum in high and low temperature test chamber compressors in repair
If the vacuum is not complete before the maintenance of the high and low temperature test chamber, it will leave a "sequel", it is likely to have ice blockage, compressor casing, high temperature, high and low temperature test chamber intermittent cooling, long-term continuous non-stop power consumption And so on.
In order to avoid the above situation, in the vacuum before filling the refrigerant, the high and low temperature test chamber should be vacuumed by the compressor itself in addition to vacuum pumping. Because the high and low temperature test chambers are generally only vacuumed on the process tubes of the compressor or the filter during the repair, only the non-condensable gas on the low or high pressure side of the high and low temperature test chamber can be removed, and the vacuum on the other side is due to It is difficult to carry out the closing of the high and low pressure valves of the compressor and the capillary, which requires the use of the function of the compressor itself to assist in solving. The specific operations are as follows:
Firstly, the vacuum pump is used to evacuate. When the reading of the pressure vacuum gauge drops to -0.1 MPa, the high and low temperature test chamber compressor is started (but the vacuum pump and the connecting valve cannot be closed). At this time, the suction function of the compressor is used to not The condensed gas is pumped into the compressor casing and pumped to the outside by a vacuum pump. Stop the compressor for about 10 to 15 minutes and continue to use the vacuum pump alone. Until the pressure gauge is stabilized at -0.1 MPa after closing the repair valve, it indicates that the vacuum of the high and low temperature test chamber has reached the requirement, and then the high and low temperature test chamber can be filled with the refrigerant.
The use of this method not only eliminates the "sequel", but also speeds up and shortens the time for vacuuming the high and low temperature test chambers.
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