中國電磁閥技術的新發展問題-上海高壓閥門廠(集團)有限公司_u赢电竞

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中國電磁閥技術的新發展問題

作者 : 上海高壓閥門廠(集團)有限公司   文章來源 : 上海高壓閥門廠(集團)有限公司    時間:2016-06-27

電磁閥作為自動化儀表的一種執行器,近年來用量急劇上升。本文分析了電磁閥的主要特點,并側重應用的角度對國内成熟技術的發展動态作簡要綜述,分别在精簡化、智能化、通用化、專用化方向作了考察,并略對影響電磁閥技術發展的社會因素作點探讨。

(1)外漏堵絕,内漏易控,使用安全。

内外洩漏是危及安全的要素。其它自控閥通常将閥杆伸出, 由電動、氣動、液動執行機構控制閥芯的轉動或移動。這都要解決長期動作閥杆動密封的外洩漏難題; 唯有電磁閥是用電磁力作用于密封在隔磁套管内的鐵芯完成,不存在動密封,所以外漏易堵絕。電動閥力矩控制不易,容易産生内漏,甚至拉斷閥杆頭部;電磁閥的結構型式容易控制内洩漏,直至降為零。所以,電磁閥使用特别安全,尤其适用于腐蝕性、有毒或高低溫的介質。

(2)系統簡單,便接電腦,價格低謙。

電磁閥本身結構簡單 , 價格也低 , 比起調節閥等其它種類執行器易于安裝維護。更 顯著的是所組成的自控系統簡單得多 , 價格要低得多。由于電磁閥是開關信号控制, 與 工控計算機連接十分方便。在當今電腦普及 , 價格大幅下降的時代 , 電磁閥的優勢就更 加明顯。

(3)動作快遞,功率微小,外形輕巧。

電磁閥響應時間可以短至幾個毫秒,即使是先導式電磁閥也可以控制在幾十毫秒内。由于自成回路,比之其它自控閥反應更靈敏。設計得當的電磁閥線圈功率消耗很低,屬節能産品;還可做到隻需觸發動作,自動保持閥位,平時一點也不耗電。電磁閥外形尺寸小,既節省空間, 又輕巧美觀。

(4)調節精度受限,适用介質受限。

電磁閥通常隻有開關兩種狀态,閥芯隻能處于兩個極限位置,不能連續調節,(力圖突破的新構思不少,但還都處于試驗試用階段)所以調節精度還受到一定限制。

電磁閥對介質潔淨度有較高要求,含顆粒狀的介質不能适用,如屬雜質須先濾去。另外, 粘稠狀介質不能适用,而且,特定的産品适用的介質粘度範圍相對較窄。

(5)型号多樣,用途廣泛。

電磁閥雖有先天不足,優點仍十分突出,所以就設計成多種多樣的産品,滿足各種不同的需求,用途極為廣泛。電磁閥技術的進步也都是圍繞着如何克服先天不足,如何更好地發揮固有優勢而展開。

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