液壓裝置-外文資料翻譯-液壓系統(tǒng)-資料下載頁
2025-01-19 03:46本頁面
【導(dǎo)讀】不作為空氣壓縮機(jī)來用，而某些壓縮機(jī)未作調(diào)整則不可以輸送非壓縮性流體。對(duì)一臺(tái)可以傳送足夠大壓力以供實(shí)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。要么用特殊密封要么緊縮加工間隙。b要真正均勻而非脈沖式輸送。c在運(yùn)行中不存在空穴現(xiàn)象，因?yàn)樽鳛閷?shí)際用途的流體都是非壓縮性的。過輸送管線排出，而不讓它潴留在泵中。意的是入口閥或油門開啟的時(shí)間，這幾乎和油口尺寸一樣重要。這是因?yàn)樵陂g隙容積中被壓縮的任何氣體都將再次膨脹而不是被排放掉。將影響泵的輸出，而且影響可能產(chǎn)生的最高壓力。使階段間有盡可能多的中間冷卻。由于氣體是進(jìn)行絕熱壓縮的而不是等溫過程壓縮的，因此，首先希望減少功和輸出量的損失。其次，由于間隙容積的原因，要減少總體上的輸。盡管標(biāo)準(zhǔn)往復(fù)泵因具有自動(dòng)閥或受壓。彈簧閥能保證這點(diǎn)，但某些旋轉(zhuǎn)式壓縮機(jī)則必須專門配上氣閥來配流，以便獲得預(yù)壓縮，體體積相應(yīng)增加。這是液壓泵在正常情況下所不需要的特性。
【正文】 cially to obtain prepression, and with some it is not possible at all. Without prepression, as soon as the delivery port opens, the gas in the delivery pipe expands back into the pump, and the whole volume has again to be pressed. A rotary pressor with prepression cannot be operated with hydraulic fluid. d. Provision for air or water cooling of the cylinder so that the temperature of the air in the pressor may be kept as near isothermal as possible, and the volume of air being delivered correspondingly increased. This is a feature not normally necessary on a hydraulic pump. e. Means for controlling gas leakages during pression either by piston rings on a reciprocating piston pressor, or fine clearances on the rotary types. f. Adequate inlet valve to prevent throttling of the ining air, with the consequent loss of volumetric efficiency.
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