Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
159 words
A refrigerating system comprising a compressor having a discharge line and an intake line, a condenser connected to the discharge line of said compressor, a receiver for receiving condensed refrigerant from said condenser, a plurality of evaporators each provided with an expansion valve, a liquid line extending from said receiver to each of said expansion valves and evaporators, a return line extending from said evaporators to the intake line of the compressor, means for selectively defrosting said evaporators by the use of hot refrigerant gas from the discharge line of the compressor, a line extending from the discharge line of the compressor to said receiver and having a pressure reducing valve therein operable to maintain the pressure in said receiver and liquid line lower than the pressure in the discharge line of the compressor, and means operable during defrost and responsive to a reduction in pressure in the receiver forincreasing the pressure in the discharge line of the compressor.
Claim 2
Dependent Claim
159 words
A refrigerating system comprising a compressor having a discharge line and an intake line, a condenser connected to the discharge line of said compressor, a receiver for receiving condensed refrigerant from said condenser, a plurality of evaporators each provided with an expansion valve, a liquid line extending from said receiver to each of said expansion valves and evaporators, a return line extending from said evaporators to the intake line of the compressor, means for selectively defrosting said evaporators by the use of hot refrigerant gas from the discharge line of the compressor, a line extending from the discharge line of the compressor to said receiver and having a pressure reducing valve therein operable to maintain the pressure in said receiver and liquid line lower than the pressure in the discharge line of the compressor, and means operable during defrost and responsive to a reduction in pressure in the receiver forincreasing the pressure in the discharge line of the compressor.
Claim 3
Dependent Claim
59 words
A refrigerating system as defined in claim 1 wherein said means for maintaining liquid refrigerant in the receiver and liquid line under substantially constant pressure includes a line extending from said compressor discharge line to said receiver and has a valve therein responsive to a pressure below that which will actuate said pressure responsive valve in said liquid line.
Claim 4
Dependent Claim
30 words
A refrigerating system as defined in claim 1 wherein a heat reclaiming coil is provided together with means for selectively connecting said heat reclaiming coil in series with said condenser.
Claim 5
Dependent Claim
33 words
A refrigeration system as defined in claim 1 wherein means are provided for delivering gaseous refrigerant to each of said evaporators at a pressure exceeding the liquid line pressure for defrosting said evaporator.
Claim 6
Dependent Claim
60 words
A refrigerating system as defined in claim 1 wherein there are a plurality of compressors and a plurality of evaporators, the compressor capacity being in excess of that required to satisfy the refrigerant load of said evaporators under low ambient temperature conditions and means are provided for rendering at least one of said compressors inoperative under low ambient temperature conditions.
Claim 7
Dependent Claim
72 words
A refrigerating system as defined in claim 4 wherein there are a plurality of evaporators which may be defrosted by the delivery of gaseous refrigerant thereto, meaNs for sensing the pressure of the refrigerant in the receiver, and valve means responsive to the operation of said sensing means operable to maintain the pressure at which refrigerant is discharged from the compressor above the pressure applied to liquid refrigerant in said liquid line.
Claim 8
Dependent Claim
39 words
A refrigerating system as defined in claim 5 wherein said means for rendering at least one of said compressors inoperative is responsive to the pressure of refrigerant gas in a suction line leading from said evaporators to said compressors.
Claim 9
Dependent Claim
44 words
A refrigerating system as defined in claim 7 wherein said sensing means is operable to control the pressure at which gaseous refrigerant is discharged from said compressor and a pressure sensing line extends from said receiver to said sensing means to actuate the same.