TH2809B - Two-stage pressure relief for protection of gas compressors in refrigeration systems. - Google Patents

Abstract

The operation and controls are disclosed for the operation of the cooling system. In order to prevent an overload of the gas compressor inside the cooling system during start-up. When the refrigeration system stops operating the refrigerant Which flows from the condenser to the evaporator inside the cooling system is effectively blocked. And the gas compressor will continue to operate for the first specified period of time enough to reduce the refrigerant in the evaporator. Until the first level is defined Subsequently, before the start-up of the refrigeration system, the gas compressor is re-operated during the refrigerant flow. From the condenser to the evaporator is extracted. In order to send the refrigerant out of the evaporator Which causes The refrigerant pressure inside the evaporator flows into the gas compressor when the refrigeration system starts the first pressure level. This two-stage pressure reduction can ensure that no Cooling the liquid from the machine to perform the operation again.

Claims (2)

1. System of cooling system that consists of A gas compressor that pressurizes the refrigerant in a gas state that is sent to the gas compressor from the evaporator. It also contains an expansion valve that is used to control the flow of refrigerant from the condenser to the evaporator. Which the system consists of - Forcing the tongue to expand and close completely This prevents the flow of refrigerant from the condenser to the evaporator. Every time the cooling system stops operating - the operation of the gas compressor in the refrigeration system for a period of time which is sufficient to cause the refrigerant pressure in the evaporator to drop to the first established pressure after Where the expansion valve is closed completely with a step-by-step closing control and - having the gas compressor in the refrigeration system run for a second time which is sufficient to bring the refrigerant pressure inside the evaporator to a specified second pressure; While keeping the expansion valve in the fully closed position prior to the restart of the stopped cooling system. 2. Control system operation of cooling system It consists of a gas compressor for applying pressure to the refrigerant in the condition of the gas being fed to the gas compressor. From an evaporator, which receives the refrigerant from another condenser, the system consists of - Expansion valve to control the flow of refrigerant from the condenser to the evaporator. The expansion valve can be completely closed to prevent the refrigerant flow from the condenser to the evaporator and - control system for shutdown. And the operation of the cooling system by moving the valve assembly to a completely closed position every time the cooling system stops operation and to produce And send the first control signal to the gas compressor inside the cooling system To allow the gas compressor to operate for an initial period sufficient to bring the refrigerant pressure inside the evaporator down to the predetermined first pressure every time the refrigeration system stops operating. And the tongue set moves into a completely sealed state with that control system. And to produce and transmit a second control signal to the gas compressor inside the cooling system While keeping the extended tongue in a fully closed position In order to keep the gas compressor operating for a second time This is sufficient to reduce the refrigerant pressure inside the evaporator to a predetermined second pressure before the control system starts operation of the refrigeration system.