A pressure regulation and control system for auto-cascade refrigeration system was designed in order to solve the problem of too high exhaust pressure and exhaust temperature at the starting up process.It is on the basis of three-stage auto-cascade refrigeration system as the research object and including a buffer

an expansion tank

pressure control valve and pipeline.Buffer has the role of easing the impact of high pressure refrigerant gas and stabling the pressure of refrigerant gas.Expansion tank has the effect of receiving and storing refrigerant gas.The bypass branch from buffer may realize high and low pressure bypass through electromagnetic valve and expansion tank.The bypass branch from the upper of the two-phase separator can effectively control and regulation the compressor discharge pressure and exhaust temperature through manual ball valve and flow meter.Through the experimental research

the cabinet with bypass refrigerator system could accelerate initial cooling speed and had the effect of fast cooling refrigerant gas.The system bypass quantity could be adjusted through pressure control valve

and then the system pressure and temperature could be controlled in a reasonable range.It might avoid forced shutdown of pressure control system.