Device and method for cool drying a gas

摘要

A device for cool drying a gas in the direction of flow of the coolant includes a closed cooling circuit with successively a compressor, a condenser and an expansion device and an evaporator that is the primary part of a heat exchanger and that has a secondary part through which the gas to be dried is guided. A bypass pipe in the cooling circuit can be closed by a bypass valve with a valve element and a pressure-sensitive element acting on it that is exposed to a local control pressure in the cooling circuit. A control pressure pipe connects the pressure sensitive element to the closed cooling circuit upstream of the outlet of the evaporator.

主权项

1. A device for cool drying a gas comprising:
a cooling circuit that is closed, the cooling circuit being arranged to contain a coolant to be circulated in the cooling circuit; a compressor arranged to circulate a coolant in the cooling circuit, and in the direction of flow of the coolant successively, a condenser connected to an outlet of the compressor, an expansion device and an evaporator connected to an inlet of the compressor, said evaporator constituting a primary part of a heat exchanger, and having a secondary part through which the gas to be dried is guided; a bypass pipe fluidly connected to the cooling circuit that is closable by a bypass valve comprising a valve element that is movable to a normally closed position under the influence of a spring element and a pressure-sensitive element that acts on the valve element, said pressure sensitive element, via a distinct control pressure pipe, being exposed to a local control pressure in the cooling circuit where the control pressure pipe is connected to the cooling circuit; and wherein the control pressure pipe is connected to the cooling circuit upstream of the outlet of the evaporator.