Refrigeration and heating cycle system

Abstract

The invention discloses a cooling and heating cycle system, comprising: a liquid receiver, a compressor, a condenser, an evaporator, a flash evaporator, first and second throttling devices, when the cooling and heating cycle system is under a small load condition When running down, the suction port feeds high-pressure refrigerant into the middle inlet chamber, and the control device controls the conduction between the middle inlet chamber and the middle outlet chamber; when the refrigeration and heating cycle system is stable under heavy load and ultra-low temperature heating conditions, During operation, the suction port feeds medium-pressure refrigerant into the middle air intake chamber, and the control device controls the conduction between the middle air inlet chamber and the middle air outlet chamber; When running under normal conditions, the suction port feeds low-pressure refrigerant into the middle air inlet chamber, and the control device controls the middle air inlet chamber and the middle air outlet chamber to be separated. According to the cooling and heating cycle system of the present invention, rapid cooling and heating can be effectively realized.

Description

technical field [0001] The invention relates to the technical field of refrigeration and heating equipment manufacturing, in particular to a refrigeration and heating cycle system. Background technique [0002] It is pointed out in related technologies that due to changes in the external environment and different user demands, the load requirements of the air conditioning system are also different. Moreover, under harsh environmental conditions, users generally require the air conditioning system to be able to achieve rapid cooling and heating. The load of the air-conditioning system varies greatly, and the requirements and performance of the air-conditioning system also vary greatly. [0003] When the load of the air-conditioning system is heavy, such as ultra-low temperature heating, due to the large specific volume of the refrigerant, the air-conditioning system’s compressor suction mass flow rate decreases, which not only leads to a significant reduction in the heating c...

AI Technical Summary

Problems solved by technology

[0004] However, in cooling operation under intermediate refrigeration and other working conditions, the pressure ratio is small and the single-stage compression efficiency is improved. If two-stage compression is also used, since two cylinders work at the same time, the friction power will increase faster than the cooling capacity. , at the same time, it may also cause over-compression of the refrigerant, resulting in a reduction in the energy efficiency of the two-stage compression

[0005] Under small load conditions, such as intermediate refrigeration conditions, it is easy to have excess cooling capacity, which leads to energy waste. At the same time, under heavy load conditions, such as ultra-low temperature heating, it is prone to insufficient heating capacity, and the efficiency is very low

Moreover, when the user requires the system to achieve rapid cooling and heating, it is impossible to quickly increase the refrigerant flow

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