【正文】
h the delivery line, instead of leaving it taped in the pump. g. Adequate inlet valve or port provision to enable the pump to create a good suction, or alternatively, as in the case of aircraft, to operate at high altitude, and with relatively thick fluids. It should be noted that the time of opening of the inlet valve or port is almost as important as the size of the port. The main requirements of a good pressor are: a. the smallest possible clearance volume patible with mechanical clearance。 d)缸體氣冷或水冷措施,使得壓縮機中氣體溫度盡可能保持等溫狀態(tài),而被輸送的氣體體積相應(yīng)增加。 b)除低壓泵外,要有兩個或更多的壓縮階段。 c 在運行中不存在空穴現(xiàn)象,因為作為實際用途的流體都是非壓縮性的。對一臺可以傳送足夠大壓力以供實際使用的液壓泵能力的主要要求是: a 控制流體泄漏的措施。 一臺良好壓縮機的主要要求是: a)與機械間隙相適應(yīng)的盡可能小的間隙容積。盡管標(biāo)準(zhǔn)往復(fù)泵因具有自動閥或受壓彈簧閥能保證這點,但某些旋轉(zhuǎn)式壓縮機則必須專門配上氣閥來配流,以便獲得預(yù)壓縮,而另一些泵則全然不可能做到。 this is because any gas pressed in the clearance volume will expand again instead of b