Defrosting arrangement and method for a refrigeration system
阅读：602发布：2024-01-14
专利汇可以提供Defrosting arrangement and method for a refrigeration system专利检索，专利查询，专利分析的服务。并且A defrosting gas is provided in a refrigeration system by compressing a gaseous refrigerant and evaporating controlled amounts of liquid refrigerant carried by the gaseous refrigerant, the latent heat of evaporation being used to defrost the evaporator. The defrosting gas is conducted from the compressor discharge outlet to the evaporator inlet by way of the condenser and the receiver, whereby the accumulation of migratory refrigerant in the receiver is prevented to ensure a sufficient supply of refrigerant in the defrosting circuit throughout the defrosting cycle. Means are provided for operating the system in such a manner.，下面是Defrosting arrangement and method for a refrigeration system专利的具体信息内容。
1. A method of operating a refrigeration system in a defrosting cycle, comprising the steps of directing gaseous refrigerant into a stream thereof, metering liquid refrigerant from a body thereof into said stream at a controlled rate, compressing said stream to provide a defrosting gas, conducting the defrosting gas through a condenser to a receiver, withdrawing the defrosting gas from the receiver and passing it through an evaporator to defrost the evaporator, withdrawing liquid and gaseous refrigerant from the evaporator, returning the liquid refrigerant withdrawn from the evaporator to said body of liquid refrigerant, and re-directing the gaseous refrigerant withdrawn from the evaporator into said stream to repeat said defrosting cycle, said steps being carried out with the condenser inoperative.
2. The method according to claim 1 including the preliminary steps of withdrawing liquid refrigerant from the receiver and passing it through the evaporator, withdrawing the liquid refrigerant from the evaporator, and collecting the liquid refrigerant withdrawn from the evaporator to establish said body of liquid refrigerant.
3. In a refrigeration system including an expansion valve, an evaporator, a compressor, a condenser communicating with the compressor discharge outlet, a receiver communicating with the condenser outlet, an accumulator arranged to receive refrigerant from the evaporator and adapted to direct gaseous refrigerant into a stream thereof, the accumulator having means for collecting a body of liquid refrigerant and means for metering liquid refrigerant from said body at a predetermined rate into said stream of gaseous refrigerant, a suction conduit for conducting said stream to the compressor suction inlet, means forming a defrost passage between the compressor discharge outlet and the evaporator inlet for bypassing gaseous refrigerant from the compressor around the expansion valve to the evaporator, and a defrost valve associated with the defrost passage for controlling the flow of refrigerant therein; the improvement comprising the feature that said means forming said defrost passage comprise the condenser, the receiver, and a defrost conduit interconnecting the receiver outlet and the evaporator inlet.
4. In a refrigeration system including an expansion valve, an evaporator, an accumulator, a compressor, a condenser and a receiver connected in series in a closed refrigeration circuit for normally conducting refrigerant in a refrigerating cycle; the evaporator, accumulator and compressor also being connected in a closed defrost circuit for alternatively conducting refrigerant in a defrosting cycle; the accumulator being adapted to direct relatively low pressure gaseous refrigerant into a stream thereof, the accumulator having means for collecting a body of liquid refrigerant and means for metering liquid refrigerant from said body at a controlled rate into said stream of gaseous refrigerant; a suction conduit for conducting said stream to the compressor suction inlet; a defrost conduit connected in the defrost circuit for bypassing relatively high pressure gaseous refrigerant from the compressor around the expansion valve to the evaporator; and a defrost valve associated with the defrost conduit and movable between a refrigerating position closing the defrost conduit to the passage of refrigerant and a defrosting position opening the defrost conduit to the passage of refrigerant; the improvement comprising the feature that the defrost conduit interconnects the receiver outlet and the evaporator inlet, whereby when the defrost valve is in its defrosting position, a defrost passage for said high pressure gaseous refrigerant is formed between the compressor discharge outlet and the evaporator inlet by the condenser, the receiver and the defrost conduit.
5. In a refrigeration system according to claim 4, wherein said refrigerant is present in the system in an amount sufficient to maintain a predetermined minimum level of liquid refrigerant in the receiver during operation in the refrigerating cycle, the further improvement comprising the feature that the receiver outlet is located substantially below said predetermined minimum level.
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