发明名称 |
METHOD AND APPARATUS FOR DETECTING SURGE IN CENTRIFUGAL COMPRESSORS DRIVEN BY ELECTRIC MOTORS |
摘要 |
A surge detection apparatus for use in a refrigeration system having a centrifugal compressor driven by an electric motor includes a first pressure transducer for sensing a condenser pressure and a second pressure transducer for sensing an evaporator pressure. A first bandpass digital filter responsive to the condenser pressure and the evaporator pressure is provided for generating a first signal representative of the rate of change of the pressure developed across the compressor. A current transformer is used to sense a current in the electric motor driving the compressor. A second bandpass digital filter responsive to the motor current is provided for generating a second signal representative of the rate of change of the RMS current being drawn by the compressor drive motor. A third signal representative of a differential pressure threshold and a fourth signal representative of a first motor current threshold and a second motor current threshold are provided. A computing device responsive to the first through fourth signals indicates when a valid surge is occurring in the compressor. |
申请公布号 |
DE3568471(D1) |
申请公布日期 |
1989.04.06 |
申请号 |
DE19853568471 |
申请日期 |
1985.11.28 |
申请人 |
YORK INTERNATIONAL CORPORATION |
发明人 |
LOWE, MADELEINE M.;HAGERMAN, ROBERT THOMAS |
分类号 |
F04D27/02;F25B1/00;F25B1/053;G01M99/00;H02H3/44;H02H7/085;(IPC1-7):F04D27/02;F25B49/00 |
主分类号 |
F04D27/02 |
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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