| 摘要 |
<p>Refrigerating system comprising a condenser (1), an expansion valve (21), an evaporator (2) and a two-stage centrifugal compressor assembly (5) with a built-in valve disk collectorless electric motor (6) whereby the refrigerant gas flowing from the first stage (3) of the compressor to the second stage (4) of the compressor passes through spaces in the motor (6) thereby cooling the motor (6), the expansion valve (21) being regulated by the pressure and the temperature of the refrigerant leaving the evaporator (2) and the speed of the motor (6) being regulated by the temperature of the air oat the exit of the evaporator (2)..</p> |
