液壓裝置-外文資料翻譯-液壓系統(tǒng)(專業(yè)版)
【正文】 泵內(nèi)無預(yù)壓力，一旦輸氣閥口打開，管線中氣體膨脹而回到泵內(nèi) ，泵內(nèi)全部流體不得不再次被壓縮。要么用特殊密封要么緊縮加工間隙。相反，不僅將影響泵的輸出，而且影響可能產(chǎn)生的最高壓力。 this is because any gas pressed in the clearance volume will expand again instead of being discharged, and will thus adversely affect not only the output of the pump, but the maxium pressure that can be achieved. b. Except on lowpressure pumps, two or more stages of pression with as much intercooling between stages as possible. This is desirable, firstly, to reduce the wastage of work and output due to the gas being pressed adiabatically instead of isothermally and, secondly, to reduce the overall loss of output due to clearance volume. c. Prepression of the air in the pump up to the pressure of the delivery line. Although the normal reciprocating pump with an automatic or springload delivery valve will ensure this some of the rotary pressors have to b
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