Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Reexamination Certificate
2005-12-02
2009-06-16
Denion, Thomas E (Department: 3748)
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
C418S270000, C418S097000, C418S002000, C418S087000, C418S089000, C418SDIG001
Reexamination Certificate
active
07547203
ABSTRACT:
In order to improve a screw compressor for compressing refrigerant in a refrigerant circuit, comprising a compressor housing, in which a screw rotor receiving means and an inlet channel as well as an outlet channel for the refrigerant to be compressed are provided, at least one screw rotor arranged in the screw rotor receiving means, a drive for the at least one screw rotor and a lubricant supply which conveys lubricant from a lubricant reservoir acted upon by pressure via a line system at least to the at least one screw rotor during operation, in such a manner that the operation and the monitoring of the screw compressor are reliable it is suggested that a valve be provided in the line system of the lubricant supply, this valve being controllable by way of a difference in pressure between the pressure in the outlet channel and a reference pressure influenced by a pressure in the refrigerant circuit and opening when the screw rotor is compressing refrigerant as well as closing when the screw rotor is not compressing refrigerant.
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Bitzer Kuehlmaschinenbau GmbH
Davis Mary A
Denion Thomas E
Reinhart Boerner Van Deuren P.C.
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