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VACUUM SYSTEM真空系統(tǒng)

雙級真空泵組冷凍干燥過程中所需要的真空泵及相關閥門組成的真空泵組，真空系統(tǒng)安裝在機架上。

真空系統(tǒng)配置包括帶有隔離閥的雙真空泵并聯運行，一旦控制壓力達到要求，一臺真空泵停止，轉為備份。雙泵系統(tǒng)在周期中自動切換。

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.

真空泵內部的連接和與冷阱的連接通過AISI304L 不銹鋼管。真空系統(tǒng)與冷凝器之間使用全自動、氣動蝶閥使真空系統(tǒng)與凍干機隔離。如果出現停電事故，閥門自動關閉以防止真空系統(tǒng)污染冷凝器并減少了在恢復來電之前由于壓力升高導致的產品損失。每臺真空泵在泵進口都安裝自動蝶閥，可以確保系統(tǒng)在作為‘備份泵’或停電時有效的隔離。在冷阱的隔離閥與泵之間安裝有一個 Pirani 探頭。每臺泵的進口上都預留帶閥門的接口，在系統(tǒng)檢查、維護時可以安裝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真空測量和控制

箱體上裝有一個真空探頭。探頭輸出信號給PLC 及記錄儀，以顯示在SCADA 系統(tǒng)上并控制。

真空的自動控制可以根據用戶的選擇采用兩個系統(tǒng)來實現：

? 摻氣 -通過調節(jié)閥和由PLC 數字輸出控制的通斷電磁隔離閥以受控的速率向箱體內輸入氣體（空氣或選擇的其它氣體－通過控制面板可以選擇相關閥門）。

? 真空節(jié)流- 通過控制安裝在冷阱和真空系統(tǒng)之間的真空隔離閥。

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

由箱體和冷凝器及相關管路、閥門、入口過濾器（如安裝）及儀表組成的系統(tǒng)泄漏率對于不凝性氣體，可保持0.03mbarl/s 或更高。

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.