| 摘要 |
Arrangement in an oil-free rotary gas compressor (2) having a high, built-in pressure ratio and provided with means (13) for injecting a vaporizable liquid, preferably water, into the compressor for cooling the gas during the compression process. It is known in high-speed compressors to utilize water injection which is so restricted that the water is completely vaporized, thereby to obtain a good cooling effect. The efficiency of the compressor is limited, however. High compressor efficiencies are obtained by injecting large quantities of water, although the compressor speed must then be considerably reduced, resulting in a lower compressor capacity. A correspondingly high efficiency can be obtained, however, in a high-speed compressor when, in accordance with the invention, the water is injected into the compressor in a weight quantity which in relation to the weight quantity of gas supplied is greater, although not more than about four times greater than that required for complete vaporization of the water during the compression process. |
