Patent ID: 6394761
Filing Date: 2002-05-28
Classification: F04B

Abstract:
A capacity control apparatus of a capacity variable compressor, the capacity of which varies essentially corresponding to variations of a control pressure as supplied into a pressure control chamber of said compressor, said compressor having an inhalation chamber and a discharge chamber, said capacity control apparatus comprising a pressure control valve having a chamber receiving an axially displaceable valve element co-acting with a valve seat which defines a flow passage between said inhalation chamber and said pressure control chamber of said compressor, and having a force transmitting diaphragm separating said chamber at its axial end opposite to said valve seat from ambient air pressure, and having valve element actuating means loading said valve element via said diaphragm in closing direction of said pressure control valve by a resilient force, the magnitude of which is selectively adjustable, said valve element when seated on said valve seat having a pressure effected area of a certain size, and said diaphragm having a pressure effected area of a certain size,wherein said chamber is connected to said pressure control chamber, wherein said valve seat is connected to said inhalation chamber outside said chamber, the sizes of said pressure effected areas being at least essentially equal, wherein an outer edge portion of said diaphragm is stationarily supported on a circular shoulder of a housing bore of said pressure control valve, said valve element carrying a frustoconical closure element for co-action with a circular inner edge of said valve seat, and wherein said circular shoulder has an inner diameter of essentially the same size as an inner diameter of said valve seat inner edge.