Compression Apparatus

Abstract

Provided is a compression apparatus that can appropriately cool a motor even in a high-temperature operation environment. A rotating shaft, a main compressor attached to the rotating shaft, and which compresses ambient gases and to emit a compressed gas, a motor attached to an upstream side of the main compressor on the rotating shaft, and which drives the main compressor, a turbine provided at the upstream side of the main compressor, and which expands a part of the ambient gas to generate a low-temperature gas to be used to cool the motor, and a sub compressor provided at the upstream side of the main compressor and at a downstream side of the turbine, and which compresses the low-temperature gas used to cool the motor to pressure equal to the ambient gas, wherein the main compressor generates the compressed gas by mixing and compressing the low-temperature gas compressed by the sub compressor and a part of the remaining ambient gas.

1 . A compression apparatus comprising:
 a first rotating shaft;   a first compressor attached to the first rotating shaft, and adapted to compress an ambient gas to emit a high-pressure compressed gas;   a first motor attached to an upstream side of the first compressor on the first rotating shaft, and adapted to drive the compressor; and   expansion means provided at an upstream side of the compressor, and adapted to expand a part of the ambient gas to generate a low-temperature gas to be used to cool the first motor.   
     
     
         2 . The compression apparatus according to  claim 1 , further comprising:
 a second compressor provided at the upstream side of the first compressor and at a downstream side of the expansion means, and adapted to compress the low-temperature gas used to cool the first motor to a pressure equal to the ambient gas, wherein   the first compressor mixes and compresses the low-temperature gas compressed by the second compressor, and a part of the remaining ambient gas to generate the compressed gas.   
     
     
         3 . The compression apparatus according to  claim 1 , wherein the expansion means is a turbine. 
     
     
         4 . The compression apparatus according to  claim 2 , wherein the turbine is attached to the first rotating shaft, and is driven by the first motor. 
     
     
         5 . The compression apparatus according to  claim 2 , further comprising:
 a second rotating shaft provided independently of the first rotating shaft; and   a second motor attached to the second rotating shaft, wherein   the turbine is attached to the second rotating shaft, and driven by the second motor, and   the expansion means expands a part of the ambient gas to generate the low-temperature gas to be used to cool the first motor and the second motor.   
     
     
         6 . The compression apparatus according to  claims 1  to  5   claim 1 ,
 the compression apparatus being a downhole compression apparatus installed in a gas well, and 
 the compression apparatus further comprising: 
 a power supply device arranged on a ground; 
 a power transmission cable that connects the power supply device and the downhole compression apparatus; 
 a cable protection pipe inserted into the power transmission cable; and 
 a heat exchanger provided between the cable protection pipe and the downhole compression apparatus, and adapted to convert a part of the compressed gas into a low-temperature compressed gas by exchanging heat with a part of the low-temperature gas, and to cause the low-temperature compressed gas to flow into the cable protection pipe. 
 
     
     
         7 . The compression apparatus according to  claim 1 , further comprising:
 a radiator installed on a downstream side of the expansion means; and   a heat transport pipe that connects the first motor and the radiator.   
     
     
         8 . The compression apparatus according to  claim 1 , wherein the expansion means is an expansion valve.