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US 7,547,203 B2Granted
Screw compressor
AssigneeBITZER Kuehlmaschinenbau GmbH
InventorRolf Dieterich
Life of this patent
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AssigneeBITZER Kuehlmaschinenbau GmbH
InventorRolf Dieterich
Estimating the term…
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.
Screw compressor for compressing refrigerant in a refrigerant circuit, comprising a compressor housing, a screw rotor receiving means and an inlet channel as well as an outlet channel for the refrigerant to be compressed being provided in said housing, 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 conveying lubricant from a lubricant reservoir acted upon by pressure via a line system to the at least one screw rotor during operation, said lubricant supply comprising a first differential pressure detection element detecting a difference in pressure between the pressure in the outlet channel and a reference pressure influenced by a pressure in the refrigerant circuit, the first differential compressor detection element comprising an actuating device for the valve in the lubricant supply as well as a sensor detecting actuation positions thereof, and a compressor control, said control switching off the drive for the at least one screw rotor when the difference in pressure following a starting phase of the drive is not in an operating pressure range determined by compression of the refrigerant as determined by the first differential compressor detection element.
Screw compressor for compressing refrigerant in a refrigerant circuit, comprising a compressor housing, a screw rotor receiving means and an inlet channel as well as an outlet channel for the refrigerant to be compressed being provided in said housing, 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 conveying lubricant from a lubricant reservoir acted upon by pressure via a line system to the at least one screw rotor during operation, a differential pressure detection element detecting a difference in pressure forming at the lubricant filter, the differential pressure detection element detecting the pressure of the lubricant in the line system in front of a filter member of the lubricant filter and behind the filter member of the lubricant filter, said differential pressure detection element comprising a piston, said piston being acted upon, on the one hand by lubricant prior to passing through a filter member of the lubricant filter and, on the other hand, by lubricant after passing through the filter member of the lubricant filter and a compressor control switching the drive off when the difference in pressure exceeds a threshold value.
Dependencies are inferred from the claim text.