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安信精密

新聞中心 / NEWS

淺析空調壓縮機過載保護技術


  空調壓縮機易受電壓、制冷系統工況的影響,在不良的使用環境中,壓縮機容易燒毀。作為空調器成本最高的部件,壓縮機的保護技術成為空調技術領域必須關注的一個重要課題。
 
  在現有的壓縮機的保護技術中使用最多的是用電流互感器或溫度傳感器檢測技術,前者是利用電流互感器感應壓縮機主電路的電流,通過電流的檢測獲知壓縮機電流,當電流超過設定值時,通過軟件的控制斷開主回路保護壓縮機,電流互感器可以裝在室內機或室外機中;溫度傳感器檢測技術是在壓縮機的表面安裝一個溫度傳感器,通過檢測壓縮機的溫度來保護壓縮機,由于壓縮機線圈在內部,其表面與外部的溫升相差甚遠,溫度測量誤差較大,在瞬間的過流中,保護效果不理想。以上兩種技術需要單片機控制,而且在室內機與室外機之間要增加一至兩條連接線,制造成本較高。
 
  從有關的實驗中發現,壓縮機燒毀往往出現在缺少制冷劑并在惡劣的使用環境工況下,壓縮機線圈溫度與進氣壓力、制冷劑的數量有關。本文主要討論在常用的空調器室內機的軟件、硬件不變的情況下,利用壓力開關作為壓力檢測器件,在室外機的閑置的空間增加一個檢測的電控板,通過對壓縮機的壓力檢測實現壓縮機的過載保護。采用這種方案,無需對空調器的原有電路進行更改,通用性極強,可應用于不同型號的空調器,而且室內機無需變化。

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