A refrigeration unit comprising a cooling circuit having a compressor, a condenser and an evaporator, and said unit including a hot gas valve and a hot gas bypass passage bypassing the condenser and forming a defrost circuit, so that when the evaporator is frosted upon operation by means of the cool
A refrigeration unit comprising a cooling circuit having a compressor, a condenser and an evaporator, and said unit including a hot gas valve and a hot gas bypass passage bypassing the condenser and forming a defrost circuit, so that when the evaporator is frosted upon operation by means of the cooling circuit, constant quantity refrigerant is circulated around the defrost circuit to perform a defrosting operation.
대표청구항▼
A refrigeration unit operable in a cooling mode and a defrost mode, comprising: a compressor, an evaporator, a cooling circuit including a condenser, said cooling circuit for supplying hot gas discharged from said compressor to said condenser through a discharged gas line and returning said hot gas
A refrigeration unit operable in a cooling mode and a defrost mode, comprising: a compressor, an evaporator, a cooling circuit including a condenser, said cooling circuit for supplying hot gas discharged from said compressor to said condenser through a discharged gas line and returning said hot gas through said evaporator to said compressor, said cooling circuit comprising a liquid reservoir portion at a portion thereof which includes said condenser a hot gas by-pass passage for supplying hot gas discharged from said compressor to said evaporator by-passing said condenser, a hot gas valve means for controlling opening and closing of said hot gas by-pass passage and for controlling opening and closing of said discharged gas line, a hot gas valve control means for causing, responsive to initiation of a pumping down operation, said hot gas valve means to close said hot gas by-pass passage and to open said discharged gas line and for causing, responsive to completion of said pumping down operation, said hot gas valve means to open said hot gas by-pass passage and to close said discharged gas line, a defrost circuit for supplying hot gas through said hot gas valve means to said evaporator and for returning said hot gas to said compressor, a constant quantity refrigerant flow-out means including a first stop valve mounted in said cooling circuit downstream of said condenser, means for closing said first stop valve, responsive to completion of a said cooling mode, to enable said pumping down operation to begin such that refrigerant is sealed in said liquid reservoir portion, said constant quantity refrigerant flow-out means for supplying a predetermined constant amount of refrigerant from said liquid reservoir portion to said defrost circuit, responsive to completion of said pumping down operation, whereby a defrosting operation is performed with said predetermined constant amount of refrigerant being supplied to the defrost circuit, said constant quantity refrigerant flow-out control mechanism further including a communication passage which by-passes said first stop valve and allows the liquid reservoir portion of the cooling circuit for sealing refrigerant in the pumping-down operation to communicate with a low pressure side of the compressor, and a second stop valve which is mounted in said communication passage and supplies a predetermined constant amount of refrigerant only into said defrost circuit out of an entire amount of refrigerant sealed in said liquid reservoir.
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이 특허에 인용된 특허 (4)
Vogel Kenneth E. (Mound MN) Powlas Jerome D. (Minneapolis MN), Head pressure control for heat reclaim refrigeration systems.
Scaringe, Robert P.; Cole, Gregory S.; Lambert, Daniel; Staples, Daniel, Apparatus for crankcase pressure regulation using only ambient air or coolant temperature.
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