Self-cascade refrigeration system with double-stage compression function

Abstract

The invention discloses a self-cascade refrigeration system with a double-stage compression function. The self-cascade refrigeration system is characterized in that a compressor (1) is provided with an intermediate air supplement port, refrigerants adopt two non-azeotropic refrigerants, an exhaust port of the compressor is sequentially connected with a condenser (3) and a gas-liquid separator (4),the high-boiling-point refrigerant discharged from the lower part of the gas-liquid separator sequentially flows through a heat regenerator (6), a first throttling component (7), a condensation evaporator (8) to a port A of a three-way valve (9), the low-boiling-point refrigerant discharged from the upper part of the gas-liquid separator sequentially flows through the condensation evaporator (8),a second throttling component (10), an evaporator (2), a rectifying pipe (11) arranged in the gas-liquid separator and the heat regenerator (6) and then is mixed with the refrigerant discharged froma port B of the three-way valve and then is returned to an air suction port of the compressor, and a port C of the three-way valve is connected with the air supplement port of the compressor. According to the system, the structure is simple, the power consumption can be effectively reduced, the refrigerating capacity can be improved, the lower temperature can be prepared, and the efficiency can beimproved.

Description

technical field

[0001] The invention relates to a refrigeration system, in particular to a self-cascading refrigeration system with two-stage compression. Background technique

[0002] Self-cascading refrigeration technology has been widely used in the field of low-temperature refrigeration, and can produce low temperatures from -40°C to -150°C. It is most widely used in cryogenic tanks and natural gas liquefaction. However, the current self-cascading refrigeration technology usually consists of two to three independent compression refrigeration cycles with different working temperature zones, resulting in a multiple increase in system components, increasing production costs and making the refrigeration system more complex, with low efficiency and energy consumption. Major issues need to be improved. Contents of the invention

[0003] In order to solve the above-mentioned problems in the prior art, the present invention proposes a self-cascading refrigeration system with...

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