Scroll-type compressors
AssigneeSanden Corporation
InventorsNorio Kitano, Yasuomi Matsumoto
Life of this patent
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Abstract
A scroll-type compressor has a piston valve mechanism for controlling the feeding of lubricating oil to slidable parts of the compressor. The piston valve mechanism includes a cylinder bore that connects a medium pressure chamber and a low pressure chamber, and a piston valve and a spring accommodated with the cylinder bore. The spring resiliently biases the piston valve toward the medium pressure chamber. The piston valve is driven by a pressure difference between the medium pressure chamber and the low pressure chamber, and by the spring. In one embodiment, an inwardly stepped, narrowed portion formed in the cylinder bore engages the piston valve to prevent further compression of the spring.
Claims7
A scroll-type compressor comprising a piston valve mechanism for controlling a flow of lubricating oil within said compressor comprises:
- a cylinder bore for establishing fluid communication between a medium pressure chamber and a low pressure chamber;
- and
- a piston valve and a spring accommodated within said cylinder bore, wherein said piston valve is driven by a pressure difference between said medium pressure chamber and said low pressure chamber, and by said spring that biases said piston valve toward said medium pressure chamber, and wherein a stroke limiting mechanism limits movement of said piston valve against said spring.
Dependencies are inferred from the claim text.