Variable displacement compressor with variable angle wobble plate and wobble angle control unit

A variable displacement wobble plate type compressor comprising:

• a suction chamber for a refrigerant;
• a plurality of cylinder bores arranged so as to surround an axial drive shaft and having therein associated reciprocatory pistons disposed so as to draw the refrigerant from the suction chamber and to then discharge the refrigerant after compression in a discharge chamber;
• a crankcase having defined therein a chamber communicating with the cylinder bores and containing therein a drive plate mounted in such a manner that it is capable of rotating with the axial drive shaft as well as changing an inclination thereof with respect to the axial drive shaft and a non-rotating wobble plate held by the drive shaft;
• a plurality of connecting rods connected between the wobble plate and pistons;
• a first passageway means for communicating said chamber of said crankcase with said discharge chamber;
• a first valve means arranged in said first passageway, means, for opening and closing said first passageway means, said first valve means including a valve seat provided in said first passageway means, a valve element cooperable with said valve seat to open and close said first passageway means, a resilient element constantly urging said valve element toward said valve seat and an actuating element operable to move said valve element away from said valve seat against said resilient element;
• a second passageway means for fluidly communicating said chamber of said crankcase with said suction chamber;
• a second valve means arranged in said second passageway means, for varying the opening of said second passageway means, said second valve means including a valve chest provided in said second passageway means, a valve element cooperable with said valve chest to extend and narrow said second passageway means, and an actuating element operable to move said valve element toward and away from said valve chest;
• valve control means for controlling the operation of said first valve means in response to a change in fluid pressure in said chamber of said crankcase with respect to a predetermined pressure level, said valve control means moving said first valve means to a first position opening said first passageway means when pressure in said chamber of said crankcase is less than said predetermined pressure level, and to a second position closing said first passageway means when said pressure in said chamber of said crankcase is larger than said predetermined pressure level,
• said second valve means being operatively connected to said valve control means, said valve control means moving said second valve means to a first position narrowing said second passageway means when pressure in said chamber of said crankcase is less than said predetermined pressure level, and to a second position expanding said second passageway means when said pressure in said chamber of said crankcase is larger than said predetermined pressure level;
• said actuating element of said first valve means and said actuating element of said second valve means being formed in an integral element arranged on a common rod member operatively connected to said valve control means;
• said valve control means further including pressure sensitive resilient means responsive to the change in said fluid pressure in said chamber of said crankcase with respect to said predetermined pressure level, said pressure sensitive resilient means being operatively connected to said rod member of said first and second valve means, thereby moving both said actuating elements of said first and second valve means,
• said pressure sensitive resilient means having a pressure sensitive chamber means connected to said chamber of said crankcase, a bellows means forming therein an atmospheric chamber communicated with an atmosphere, a spring means arranged in said atmospheric chamber for applying a predetermined force to extend said bellows means, and a plate means attached to said bellows means and said rod element of said first and second valve means.