Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Reexamination Certificate
2005-06-01
2010-02-23
Kramer, Devon C (Department: 3746)
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
C417S288000, C251S063600
Reexamination Certificate
active
07665973
ABSTRACT:
An apparatus for changing capacity of a multi-stage compressor comprises: a first cylinder provided with a first suction and a first discharge port, and divided into a first suction chamber and a first compression chamber by a first rolling piston which orbits and a first vane which makes a linear movement in contact with the first rolling piston; a second cylinder provided with a second suction port and a second discharge port, and divided into a second suction chamber and a second compression chamber by a second rolling piston which orbits and a second vane which makes a linear movement in contact with the second rolling piston; a middle bearing inserted between the first cylinder and the second cylinder, having a bypass hole to allow communication between the compression chambers of the first cylinder and the second cylinder, and having a valve hole for communication in the middle of the bypass hole; a sliding valve slidingly coupled to the valve hole of the middle bearing, and selectively opening or closing the bypass hole; and a pressure switching unit for selectively supplying discharge pressure to one side of the sliding valve, thereby changing a capacity using all the plural compression units, and obtaining power saving effect suitable for the saving mode.
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English language Abstract of JP 7-54782.
U.S. Appl. No. 11/111,850 to Hwang et al., which was filed on Apr. 22, 2005.
Kasture Dnyanesh
KED & Associates LLP
Kramer Devon C
LG Electronics Inc.
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