VACUUM SYSTEM真空系(xi)統
雙級真(zhen)(zhen)空(kong)泵(beng)組(zu)冷凍干燥(zao)過程中(zhong)所需要的真(zhen)(zhen)空(kong)泵(beng)及(ji)相關閥門(men)組(zu)成的真(zhen)(zhen)空(kong)泵(beng)組(zu)，真(zhen)(zhen)空(kong)系(xi)統安裝在(zai)機架上。
真空系統配置包括帶(dai)有隔離閥的雙真空泵(beng)并(bing)聯(lian)運行，一(yi)旦控(kong)制壓力(li)達到要(yao)求(qiu)，一(yi)臺真空泵(beng)停(ting)止，轉為備份。雙泵(beng)系統在周期(qi)中自動切換。
The vacuum pump group composed of vacuum pump and related valves in the freeze-drying process of the two-stage vacuum pump group, the vacuum system is installed on the frame.
Vacuum system configuration includes double vacuum pump with isolation valve running in parallel. Once the control pressure meets the requirements, a vacuum pump stops and is converted to backup. The double pump system switches automatically during the cycle.
真空(kong)泵內部的(de)連(lian)接(jie)和與(yu)(yu)冷(leng)阱的(de)連(lian)接(jie)通過AISI304L 不銹鋼管。真空(kong)系統與(yu)(yu)冷(leng)凝器之間使(shi)用(yong)全(quan)自動(dong)(dong)、氣動(dong)(dong)蝶(die)閥(fa)(fa)使(shi)真空(kong)系統與(yu)(yu)凍干機隔(ge)離。如果出(chu)現停電(dian)事(shi)故，閥(fa)(fa)門自動(dong)(dong)關閉以防止真空(kong)系統污染(ran)冷(leng)凝器并減(jian)少(shao)了在(zai)(zai)恢復來電(dian)之前由于壓(ya)力升高導致的(de)產品損失。每臺真空(kong)泵在(zai)(zai)泵進(jin)口(kou)都安(an)裝(zhuang)自動(dong)(dong)蝶(die)閥(fa)(fa)，可(ke)以確(que)保系統在(zai)(zai)作為‘備份泵’或停電(dian)時(shi)有效的(de)隔(ge)離。在(zai)(zai)冷(leng)阱的(de)隔(ge)離閥(fa)(fa)與(yu)(yu)泵之間安(an)裝(zhuang)有一個 Pirani 探頭。每臺泵的(de)進(jin)口(kou)上(shang)都預留帶(dai)閥(fa)(fa)門的(de)接(jie)口(kou)，在(zai)(zai)系統檢(jian)查、維護時(shi)可(ke)以安(an)裝(zhuang)Pirani 探頭。
Vacuum pump internal connection and cold trap connection through AISI304L stainless steel pipe. The vacuum system and condenser are fully automatic, and the pneumatic butterfly valve separates the vacuum system from the freeze-drying machine. In the event of a power outage, the valve is automatically closed to prevent the vacuum system from polluting the condenser and to reduce the loss of the product due to increased pressure before resuming the incoming call. Each vacuum pump is equipped with an automatic butterfly valve at the inlet of the pump to ensure that the system is effectively isolated as a backup pump or as a power outage. A Pirani probe is installed between the cold trap isolation valve and the pump. The interface with valve is reserved on the inlet of each pump Pirani probe can be installed during system inspection and maintenance.
Vacuum Measurement and Control真空測量(liang)和(he)控(kong)制
箱體(ti)上(shang)裝有一個真空探頭。探頭輸出信(xin)號給PLC 及記錄(lu)儀，以(yi)顯示在SCADA 系統上(shang)并控制。
真空(kong)的(de)自動控制可以根據用(yong)(yong)戶的(de)選擇(ze)采用(yong)(yong)兩個(ge)系(xi)統來實(shi)現：
? 摻氣 -通(tong)過調節閥和由PLC 數(shu)字輸出控(kong)(kong)制(zhi)的(de)通(tong)斷(duan)電磁(ci)隔離閥以受(shou)控(kong)(kong)的(de)速率向箱體內輸入氣體（空氣或選擇的(de)其它氣體－通(tong)過控(kong)(kong)制(zhi)面(mian)板可以選擇相關閥門）。
? 真空(kong)節流- 通過控制安(an)裝在冷(leng)阱和真空(kong)系統之(zhi)間的真空(kong)隔離(li)閥。
The chamber is supplied with a vacuum gauge (see item 26). The gauge output is fed to the PLC for control purposes, recorded on the chart recorder and displayed within the Lyomax Compact system.
Automatic vacuum control is achieved by either of two systems according to user selection:
?Gas bleed - a gas (air or selected gas – the appropriate valve is selected via the control panel) is fed into the chamber at a rate controlled via a modulating valve (see item 27) and on/off solenoid isolation valve controlled by a digital PLC output.
?Vacuum throttling - by controlling the vacuum isolation valve installed between the condenser and vacuum system.
Leak Tightness泄漏率
由箱體和冷凝(ning)器及相關(guan)管(guan)路、閥門、入口過濾(lv)器（如安(an)裝(zhuang)）及儀表組成的系統泄漏率(lv)對(dui)于不凝(ning)性氣體，可保持0.03mbarl/s 或(huo)更高。
The complete process system comprising chamber, condenser and associated pipework, valves, inlet filters (when fitted) and instruments shall have a leak rate of 0.03mbarl/s or better for non-condensable gases.
