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低氣壓環境對產品性能的影響
來源: bibil.cn 時間:2020-10-30
    許(xu)多產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)的(de)試驗報告及實地考察(cha)都(dou)反映出氣(qi)(qi)壓(ya)降(jiang)低(di)(di)對(dui)產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)性(xing)(xing)(xing)能(neng)(neng)有重要(yao)影響,氣(qi)(qi)壓(ya)降(jiang)低(di)(di)對(dui)產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)的(de)直接影響主要(yao)是氣(qi)(qi)壓(ya)變化產(chan)(chan)(chan)(chan)(chan)生(sheng)的(de)壓(ya)差(cha)作用(yong)。它對(dui)密(mi)封(feng)產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)的(de)外殼會(hui)產(chan)(chan)(chan)(chan)(chan)生(sheng)一個壓(ya)力,在這個壓(ya)力作用(yong)下會(hui)使密(mi)封(feng)破壞(huai),降(jiang)低(di)(di)產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)的(de)可(ke)靠(kao)性(xing)(xing)(xing)。然而,氣(qi)(qi)壓(ya)降(jiang)低(di)(di)的(de)主要(yao)作用(yong)還在于因(yin)氣(qi)(qi)壓(ya)降(jiang)低(di)(di)伴隨(sui)著大氣(qi)(qi)密(mi)度的(de)降(jiang)低(di)(di),由此會(hui)使產(chan)(chan)(chan)(chan)(chan)品(pin)(pin)的(de)性(xing)(xing)(xing)能(neng)(neng)受到很大的(de)影響。對(dui)產(chan)(chan)(chan)(chan)(chan)晶性(xing)(xing)(xing)能(neng)(neng)的(de)影響主要(yao)有三方(fang)面。

    1、散熱產品的溫升隨(sui)大氣壓降低面增加

    電工電子產品有相(xiang)當一(yi)部分是(shi)發(fa)熱(re)(re)產品,如電機、變(bian)壓(ya)器、接觸器、電阻器等。這些產品在使(shi)用中(zhong)要(yao)消耗一(yi)部分電能(neng)變(bian)成為(wei)熱(re)(re)能(neng),這樣產品會發(fa)熱(re)(re),溫(wen)度(du)(du)升(sheng)高。產品因發(fa)熱(re)(re)而使(shi)溫(wen)度(du)(du)升(sheng)高,這溫(wen)度(du)(du)升(sheng)高部分稱之為(wei)溫(wen)升(sheng)。散熱(re)(re)產品的(de)溫(wen)升(sheng)隨(sui)(sui)大氣壓(ya)的(de)降低(di)而增(zeng)加,隨(sui)(sui)海撥高度(du)(du)的(de)增(zeng)加面增(zeng)加。導致產品的(de)性能(neng)下降或運(yun)行不穩定等現象出現。

    2、低氣壓對密封產品的影響

    低(di)氣壓(ya)對(dui)密封(feng)產(chan)品(pin)(pin)的(de)影響主要是由于(yu)大氣壓(ya)的(de)變化形成壓(ya)差。壓(ya)差引起一個從高壓(ya)指向(xiang)低(di)壓(ya)的(de)力。在該力作用下,使(shi)氣體流動(dong)來達到平衡(heng)。而(er)對(dui)于(yu)密封(feng)產(chan)品(pin)(pin),其外(wai)殼將承受(shou)此力。此力可以使(shi)外(wai)殼變形、密封(feng)件破裂造(zao)成產(chan)品(pin)(pin)失效。

    3、低(di)氣壓對電性能的影(ying)響

    海撥高度增加氣(qi)(qi)壓(ya)(ya)降(jiang)低(di),對電(dian)(dian)(dian)(dian)(dian)工電(dian)(dian)(dian)(dian)(dian)子產(chan)(chan)(chan)品(pin)的(de)(de)電(dian)(dian)(dian)(dian)(dian)氣(qi)(qi)性能也會(hui)(hui)產(chan)(chan)(chan)生(sheng)影(ying)響。特別(bie)是以(yi)(yi)空(kong)氣(qi)(qi)作為絕(jue)緣(yuan)(yuan)介(jie)質(zhi)(zhi)的(de)(de)設(she)備,低(di)氣(qi)(qi)壓(ya)(ya)對設(she)備的(de)(de)影(ying)響更(geng)為顯著(zhu)。在正常(chang)大(da)氣(qi)(qi)條件下,空(kong)氣(qi)(qi)可以(yi)(yi)是較好的(de)(de)絕(jue)緣(yuan)(yuan)介(jie)質(zhi)(zhi).許多電(dian)(dian)(dian)(dian)(dian)氣(qi)(qi)產(chan)(chan)(chan)品(pin)以(yi)(yi)空(kong)氣(qi)(qi)為絕(jue)緣(yuan)(yuan)介(jie)質(zhi)(zhi)。這些產(chan)(chan)(chan)品(pin)用于高海撥地區或作為機載設(she)備時,由于大(da)氣(qi)(qi)壓(ya)(ya)降(jiang)低(di),常(chang)常(chang)在電(dian)(dian)(dian)(dian)(dian)場(chang)較強的(de)(de)電(dian)(dian)(dian)(dian)(dian)極附近(jin)產(chan)(chan)(chan)生(sheng)局(ju)部放電(dian)(dian)(dian)(dian)(dian)現(xian)象,稱(cheng)之為電(dian)(dian)(dian)(dian)(dian)暈。更(geng)嚴重的(de)(de)是,有時會(hui)(hui)發生(sheng)空(kong)氣(qi)(qi)間隙擊穿。這意味著(zhu)設(she)備的(de)(de)正常(chang)工作狀(zhuang)態被破壞。

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