Cooling system capable of defrosting

  • US 10,655,893 B2
  • Filed: 02/12/2016
  • Issued: 05/19/2020
  • Est. Priority Date: 02/13/2015
  • Status: Active Grant
First Claim
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1. A cooling system capable of defrosting, which is adapted for cooling a working fluid, comprising:

  • a cooling device having a compressor provided with a motor, a condenser, an expander, an evaporator, a cooling channel, at least one additional condenser, and a coolant flowing in the cooling channel to pass through the compressor, the condenser, the at least one additional condenser, the expander and the evaporator and flow back through the at least one additional condenser to the compressor in succession;

    an inverter electrically connected with the motor of the compressor for controlling a rotary speed of the motor;

    a power factor corrector electrically connected with the inverter for outputting a direct current power to the inverter to drive the motor to rotate;

    a controller electrically connected with the inverter to control the rotary speed of the motor according to a mass flow of the working fluid;

    a defrosting unit having a defrosting channel, in which the coolant that flows from the compressor flows through the evaporator and the at least one additional condenser to the compressor, and a switch disposed on the cooling channel and located between the compressor and the condenser in fluid communication with the defrosting channel to conduct the coolant to flow in one of the cooling channel and the defrosting channel; and

    a pipe disposed by the at least one additional condenser and the evaporator in a way that the working fluid flows in the pipe and passes by the at least one additional condenser to be pre-cooled by thermally exchanging with the coolant that flows in the cooling channel from the evaporator back through the at least one additional condenser and passes by the evaporator to thermally exchange with the coolant that flows in the cooling channel in the evaporator so as to be cooled down and to be directed to a device under test,wherein in a defrost mode, the coolant flowing in the defrosting channel continuously flows from the compressor through the evaporator and the at least one additional condenser and back to the compressor such that a part of the pipe corresponding between the evaporator and the at least one additional condenser is defrosted.

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