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鍍膜設(shè)備真空系統(tǒng)的設(shè)計(jì)
目前在各種真空鍍膜設(shè)備上所配用的真空系統(tǒng)不但結(jié)構(gòu)各不相同,而且系統(tǒng)的抽氣特性也隨其工作對(duì)象的不同而有很大的差別.歸納起來主要有如下幾種系統(tǒng)。
定片式機(jī)械真空泵的維修
定片泵的結(jié)構(gòu)全為組合式,與小五片相似。其排氣閥是彈子式的,定片泵啟動(dòng)和正常使用必須遵守一定規(guī)程,也應(yīng)規(guī)定按期換油制度。
補(bǔ)充水對(duì)水環(huán)真空泵性能的影響
水環(huán)真空泵在運(yùn)行時(shí),源源不斷地供給補(bǔ)充水是必不可少的條件。不同的泵在不同的工況下,都要求不同的補(bǔ)充水水量,過大或過小的水量,對(duì)泵的工作都會(huì)產(chǎn)生不良的影響,此外,補(bǔ)充水水壓對(duì)補(bǔ)充水水量和泵的容積損失有重要影響。最后,為了使補(bǔ)充水傳給水環(huán)的能量能有效地對(duì)氣體作功,使效率提高,補(bǔ)充水應(yīng)該在液體對(duì)氣體作功結(jié)束時(shí),也就是在壓縮腔的最高點(diǎn)進(jìn)入,這樣水環(huán)獲得充分的能量,在下次循環(huán)回轉(zhuǎn)時(shí)又可重新開始工作。
保持真空泵真空度嚴(yán)密性的方法
為保持真空泵嚴(yán)密性,加強(qiáng)檢測手段,在真空泵生產(chǎn)制造過程中,力求設(shè)備漏點(diǎn)盡可能少。對(duì)結(jié)合點(diǎn)進(jìn)行探傷檢查,另外在設(shè)計(jì)上盡量減少現(xiàn)場安裝時(shí)的結(jié)合點(diǎn),使現(xiàn)場安裝工作的焊接量盡可能少。此外,進(jìn)入系統(tǒng)的空氣量不但與蒸汽量有關(guān),更主要的與處于真空狀態(tài)下的各個(gè)設(shè)備的嚴(yán)密性和安裝質(zhì)量有關(guān)。
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