Secondary throttling middle complete cooling double-working-condition refrigeration system

Abstract

The invention discloses a secondary throttling middle complete cooling double-working-condition refrigeration system. The secondary throttling middle complete cooling double-working-condition refrigeration system can achieve variable flow single-stage steam compression circulation, and can also achieve double-stage compression circulation of variable flow secondary throttling middle complete cooling. The secondary throttling middle complete cooling double-working-condition refrigeration system comprises a plurality of sets of variable flow compression condenser units which are connected among a high-temperature air suction pipeline, a low-temperature air suction pipeline and a middle-pressure liquid supply pipeline in parallel, wherein each variable flow compression condenser unit is composed of a low-pressure constant flow compressor, a low-pressure variable flow compressor, a high-pressure variable flow compressor, a first one-way valve, a second one-way valve, a third one-way valve, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a condenser, an intercooler and a throttling valve. The variable flow compression condenser units can suck air from the high-temperature air suction pipeline to achieve single-stage compression refrigeration circulation to supply liquid to the middle-pressure liquid supply pipeline, and can also suck air from the low-temperature air suction pipeline to achieve secondary throttling middle complete cooling double-stage compression circulation to supply liquid to the middle-pressure liquid supply pipeline.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a two-stage compression refrigeration system with secondary throttling, intermediate complete cooling, dual working conditions, and cooling capacity adjustment by changing the refrigerant flow rate. Background technique [0002] The existing two-stage compression refrigeration system used for freezing cold storage usually uses temperature control to start and stop the compressor. When the temperature of the cold storage reaches the temperature set by the thermostat, the refrigeration system stops working; when the temperature rises to the upper limit set by the thermostat, The cooling system is on. There is a contradiction in such a system. When the temperature difference between startup and shutdown is relatively large, the food stored in the frozen storage will lose water and dryness due to different freezing rates, and food quality will decline; when the temperature diff...

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Problems solved by technology

[0004] For the parallel system of frozen cold storage (lower suction temperature, usually requires a two-stage compression system) and cold storage (higher suction temperature, usually requires a single-stage vapor compression system), it is often necessary to use single and double-stage vapor compression systems. Separately configured, the one-time investment of the system is large, and the adjustment of cooling capacity is completely realized by starting and stopping

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