Patent ID: 6679676
Filing Date: 2004-01-20
Classification: F04C

Abstract:
A vacuum generator device comprising at least one vacuum pump and a temperature control system which controls the temperature of the vacuum pump, the temperature control system having at least one heat exchange circuit in which a heat-conveying liquid circulates and including at least one first circuit portion which is in thermal communication with the pump body of the vacuum pump, including circulation means which causes the heat-conveying liquid to circulate in the heat exchange circuit, and having control means which controls the heat exchange capacity of the heat exchange circuit as a function of a control signal, whereinheat conduction means having thermal conductance that is adjustable by the control means provide thermal communication between the pump body and the first circuit portion; the control means vary the thermal conductance of the heat conduction means so as to maintain the temperature of the pump body in the vicinity of a predetermined reference temperature; the circulation means cause the heat-conveying liquid to circulate permanently in the heat exchange circuit at a flow rate that is not less than the flow rate required for providing sufficient heat exchange under extreme operating conditions of the vacuum pump.