The energy-saving valve energy-saving valve can correspond to the pressure change characteristic of the rotary compressor when the rotary compressor is started and stopped, and functions to prevent the "work fluid migration" and balance the suction and discharge pressure of the compressor. Countermeasures Adopted A large number of studies at home and abroad have shown that there is energy loss in the method of controlling the cooling capacity by using start and stop. At present, there are two main solutions for small refrigeration systems. Frequency conversion technology using frequency conversion technology is a new type of electric drive speed control technology that has been rapidly developed in recent years. Since this technology has many obvious advantages, it has developed very rapidly. It has been applied to various industrial fields, including the field of refrigeration and air conditioning.
When the compressor is working, the low pressure valve is opened, the high pressure valve is also opened, and the refrigeration cycle works normally. When the operation stops, the low pressure valve closes due to the air flow stop. When the compressor is started again, the Ps pressure drops rapidly, the low pressure valve opens, and the high pressure valve opens and operates normally. This process consumes power but does not generate cooling. Further, during the shutdown, the refrigerant continues to flow into the evaporator, and part of the liquid refrigerant vaporizes, causing an increase in the amount of gaseous refrigerant, which causes the evaporation pressure to rise. It can be seen that the energy-saving valve can well avoid the problem of "work migration" and reduce the energy loss caused by the shutdown.
It can be seen from the research results of various aspects that the small-scale refrigeration system with the start-stop as the energy regulation mode, the phenomenon of "work migration" is the root cause of energy loss during the start-stop process. By changing the way of opening and stopping, it can reduce or even prevent this from happening, effectively improving the running performance of small refrigeration equipment and improving energy efficiency.