发明名称 |
Oil free screw compressor operating at variable speeds and control method therefor |
摘要 |
An oil free screw compressor having a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided in a pipe branching off midway an air pipe connecting between the high-pressure stage compressor body and the low-pressure stage compressor body, and a high-pressure stage blow-off two-way valve is provided in a pipe branching off from a discharge air pipe provided on a discharge side of the high-pressure stage compressor body. During no-load operation, a controller gives a command to the inverter to make the rotational speed of the motor a set lower limit rotational speed, and also gives an open command to the low-pressure stage blow-off two-way valve.
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申请公布号 |
US2003180150(A1) |
申请公布日期 |
2003.09.25 |
申请号 |
US20030389769 |
申请日期 |
2003.03.18 |
申请人 |
NISHIMURA HITOSHI;OHTA HIROSHI |
发明人 |
NISHIMURA HITOSHI;OHTA HIROSHI |
分类号 |
F04C18/16;F04C23/00;F04C28/02;F04C28/06;F04C28/08;F04C28/24;F04C29/04;(IPC1-7):F04B49/06 |
主分类号 |
F04C18/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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