Variable inner volume ratio-type inverter screw compressor

US20060039805A1Inactive Publication Date: 2006-02-23DAIKIN IND LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
DAIKIN IND LTD
Publication Date
2006-02-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

Regulating compression capability to a load is performed by an inverter (15) that regulates revolution number of an electric motor (11). This makes unload control in capability regulation unnecessary, preventing operational efficiency from lowering. Further, a capacity control valve for capacity control is eliminated for a simplified valve control mechanism. Regulating a variable inner volume ratio achieves the highest compressor efficiency corresponding to operating condition (capability). When a low inner volume ratio command is issued, a slide valve (19) is moved by a compression section controller (27) in an axial direction toward the electric motor (11). This advances completion time of a compression step to advance discharge of a compressed gas. When a high inner volume ratio command is issued, the slide valve (19) is moved in an axial direction toward a piston (25), which delays time of completion of compression step to delay discharge of a compressed gas.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a variable inner volume ratio-mode inverter screw compressor in which an inner volume ratio, the ratio between suction capacity and discharge capacity of a screw compressor, is made variable. BACKGROUND ART

[0002] There is conventionally provided a variable inner volume ratio-mode inverter screw compressor shown in FIG. 7 (for example, see JP 3159762 B2) as a variable inner volume ratio-mode inverter screw compressor in which an inner volume ratio thereof is variable.

[0003] According to this variable inner volume ratio-mode inverter screw compressor, when the inner-volume ratio is required to be changed, a stepping motor 1 rotates a rod 2 to cause a variable VI (inner volume ratio) valve 3 to move backward, for example. At that time, a capacity controlling valve 4 moves backward together with the variable VI valve 3 moving backward, and when the variable VI valve 3 is fixed at a new set position, the capacity controlling valve...

Claims

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