Anti-low temperature freezing oil self-cascading refrigeration system and its control method

Abstract

Embodiments of the present invention provide an anti-low temperature freezing oil self-cascading refrigeration system and its control method, which relate to the field of refrigeration technology and can solve the problem that lubricating oil enters the evaporator unit through an intermediate regenerator to form a lubricating oil ice block. The system includes a compression refrigeration device, an intermediate regenerator, a first throttling unit, and an evaporator unit; the heat inflow inlet of the intermediate regenerator is connected with the first outlet of the compression refrigeration device through a pipeline, and the heat outflow outlet of the intermediate regenerator passes through The first throttling unit is connected to the inlet of the evaporator unit; the first cold inlet of the intermediate regenerator communicates with the outlet of the evaporator unit through a pipeline, and the cold outlet of the intermediate regenerator communicates with the outlet of the compression refrigeration device through a pipeline. Inlet connection; the second outlet of the compression refrigeration device communicates with the second cold flow inlet of the intermediate regenerator through the antifreeze oil unit; when the system starts, the antifreeze oil unit opens and enters a bidirectional conduction state; Closed to enter the one-way conduction state.

Description

Technical field [0001] The invention relates to the technical field of refrigeration, in particular to a low-temperature freezing oil self-cascade refrigeration system and a control method thereof. Background technique [0002] When making lower temperatures, cascade refrigeration cycles are widely used. The cascade refrigeration cycle is composed of a classic cascade refrigeration cycle and a self-cascade refrigeration cycle. In the classic cascade refrigeration cycle, the increase in the number of cascade stages will make the structure more complicated, the efficiency lower, and the cost increase. The self-cascade refrigeration system has become a hot research topic due to its simple structure, high reliability, long life and low cost. The self-cascade refrigeration system is mainly used to produce temperatures below -40℃. It adopts single-stage compression, natural separation, and multi-stage cascade methods of a single compressor and mixed working fluids. Choose a suitable w...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides an anti-low temperature freezing oil self-cascading refrigeration system and its control method, which can solve the problem that lubricating oil enters the evaporator unit through the intermediate regenerator to form ice blockage of lubricating oil

Images