Variable-capacity scroll-type compressor
First Claim
1. A variable-capacity scroll-type compressor comprising:
- a hermetic casing;
a fixed scroll element and a moving scroll element positioned in the hermetic casing;
a motor coupled to, and for driving the moving scroll element in an orbital motion;
the moving scroll element and the fixed scroll element coacting to form pairs of compression pockets, each defining a volume that decreases towards a center defined by the moving and fixed scroll elements during the orbital motion;
the hermetic casing having, at least one intake chamber located in a low pressure zone for supplying the compression pockets with fluid, and a central outlet passage for receiving fluid compressed in the compression pockets;
a non-return shutter positioned in the central outlet passage, the passage supplying fluid to a high pressure chamber formed in part by the fixed scroll element;
at least one by-pass valve positioned in the low pressure zone, said bypass valve defining a chamber in fluid communication via a first duct with at least one of the compression pockets, said chamber also being in communication with the low pressure zone via a second duct;
the first and second ducts each having an opening proximate the other so that the openings can be closed via a shutter movably positioned in the chamber;
a third duct opening into the chamber for conveying a shutter control fluid; and
wherein the bypass valve defines a special purpose body located in the hermetic casing.
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Accused Products
Abstract
In a compresor at least one bypass valve is arranged in a low-pressure zone inside a casing of the compressor. The bypass valve defines a chamber connected by a first duct to at least one compression pocket situated in the peripheral zone of the compression stage and by a second duct to low-pressure zone, the two ducts opening near one another so that they can be shut off by a shutter which can move in the chamber, being guided by the walls that delimit this chamber, a third duct intended for conveying a shutter-control fluid opening into the lower wall of the chamber of the valve. The shutter is opened by gravity when no control fluid is applied.
50 Citations
9 Claims
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1. A variable-capacity scroll-type compressor comprising:
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a hermetic casing;
a fixed scroll element and a moving scroll element positioned in the hermetic casing;
a motor coupled to, and for driving the moving scroll element in an orbital motion;
the moving scroll element and the fixed scroll element coacting to form pairs of compression pockets, each defining a volume that decreases towards a center defined by the moving and fixed scroll elements during the orbital motion;
the hermetic casing having, at least one intake chamber located in a low pressure zone for supplying the compression pockets with fluid, and a central outlet passage for receiving fluid compressed in the compression pockets;
a non-return shutter positioned in the central outlet passage, the passage supplying fluid to a high pressure chamber formed in part by the fixed scroll element;
at least one by-pass valve positioned in the low pressure zone, said bypass valve defining a chamber in fluid communication via a first duct with at least one of the compression pockets, said chamber also being in communication with the low pressure zone via a second duct;
the first and second ducts each having an opening proximate the other so that the openings can be closed via a shutter movably positioned in the chamber;
a third duct opening into the chamber for conveying a shutter control fluid; and
whereinthe bypass valve defines a special purpose body located in the hermetic casing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification