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礦物絕緣防火電纜和硅橡膠電纜比較
硅橡(xiang)(xiang)膠具有較好的彎曲性(xing)(xing)(xing)(xing)能(neng)(neng)和(he)低溫(wen)(wen)(wen)(wen)性(xing)(xing)(xing)(xing)能(neng)(neng),不易損壞和(he)開裂,這些(xie)性(xing)(xing)(xing)(xing)能(neng)(neng)是一(yi)般高(gao)溫(wen)(wen)(wen)(wen)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)不具有的因而硅橡(xiang)(xiang)膠電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)具有較寬的應用范圍,已是高(gao)溫(wen)(wen)(wen)(wen)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)的一(yi)個(ge)亮點。硅橡(xiang)(xiang)膠電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)在高(gao)溫(wen)(wen)(wen)(wen)移動電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、軟電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)、耐高(gao)溫(wen)(wen)(wen)(wen)電(dian)(dian)(dian)(dian)機引接線、低溫(wen)(wen)(wen)(wen)環境高(gao)溫(wen)(wen)(wen)(wen)運行場所。礦(kuang)(kuang)物絕緣防(fang)火(huo)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)與(yu)硅橡(xiang)(xiang)膠電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)特性(xing)(xing)(xing)(xing)二)無機資料超(chao)高(gao)溫(wen)(wen)(wen)(wen)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)無機資料因不具有可擠塑等優(you)(you)良加工(gong)性(xing)(xing)(xing)(xing)能(neng)(neng),因而加工(gong)形(xing)成電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)絕緣較為(wei)困難(nan),附著性(xing)(xing)(xing)(xing)和(he)均勻性(xing)(xing)(xing)(xing)較差,而且絕緣性(xing)(xing)(xing)(xing)能(neng)(neng)比高(gao)分子資料要低,但優(you)(you)異的高(gao)溫(wen)(wen)(wen)(wen)性(xing)(xing)(xing)(xing)能(neng)(neng),能(neng)(neng)夠滿足特種高(gao)溫(wen)(wen)(wen)(wen)行業的需求。信息來自:輸配電(dian)(dian)(dian)(dian)設備網1礦(kuang)(kuang)物絕緣防(fang)火(huo)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)產品...
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雙金屬溫度計的工作原理
通常將(jiang)金(jin)屬(shu)(shu)(shu)(shu)片制成(cheng)螺(luo)旋(xuan)卷(juan)形狀。當(dang)多(duo)層金(jin)屬(shu)(shu)(shu)(shu)片的(de)溫(wen)度(du)(du)(du)(du)改變時(shi),雙金(jin)屬(shu)(shu)(shu)(shu)溫(wen)度(du)(du)(du)(du)計(ji)利用兩種(zhong)(zhong)不同(tong)金(jin)屬(shu)(shu)(shu)(shu)在(zai)(zai)溫(wen)度(du)(du)(du)(du)改變時(shi)膨脹水平不同(tong)的(de)原(yuan)理工作的(de)工業用雙金(jin)屬(shu)(shu)(shu)(shu)溫(wen)度(du)(du)(du)(du)計(ji)主要的(de)元件是(shi)一個用兩種(zhong)(zhong)或(huo)多(duo)種(zhong)(zhong)金(jin)屬(shu)(shu)(shu)(shu)片疊壓在(zai)(zai)一起組(zu)成(cheng)的(de)多(duo)層金(jin)屬(shu)(shu)(shu)(shu)片。為提高(gao)測溫(wen)靈敏(min)度(du)(du)(du)(du)。各層金(jin)屬(shu)(shu)(shu)(shu)膨脹或(huo)收縮量不等,使得螺(luo)旋(xuan)卷(juan)卷(juan)起或(huo)松開。由(you)于(yu)螺(luo)旋(xuan)卷(juan)的(de)一端(duan)固(gu)定(ding)而(er)另(ling)一端(duan)和一可以自(zi)由(you)轉(zhuan)動的(de)指針相(xiang)連,因此,當(dang)雙金(jin)屬(shu)(shu)(shu)(shu)片感受(shou)到溫(wen)度(du)(du)(du)(du)變化(hua)時(shi),指針即(ji)可在(zai)(zai)一圓(yuan)形分度(du)(du)(du)(du)標尺上指示出溫(wen)度(du)(du)(du)(du)來。這種(zhong)(zhong)儀表的(de)測溫(wen)范圍是(shi)200~650℃,允許誤(wu)差(cha)均為標尺兩程(cheng)的(de)1%左右。這種(zhong)(zhong)溫(wen)度(du)(du)(du)(du)計(ji)和棒狀...
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硅橡膠的應用
以(yi)(yi)含氫硅氧烷為交聯劑,室(shi)(shi)溫(wen)硫(liu)(liu)化硅橡膠(jiao)(jiao)一般包(bao)括縮(suo)合(he)(he)型(xing)(xing)(xing)和加成(cheng)型(xing)(xing)(xing)兩(liang)大(da)類。加成(cheng)型(xing)(xing)(xing)室(shi)(shi)溫(wen)膠(jiao)(jiao)是(shi)以(yi)(yi)具(ju)有(you)(you)乙烯(xi)基的(de)線性(xing)聚(ju)硅氧烷為基礎膠(jiao)(jiao)。催化劑存在下于室(shi)(shi)溫(wen)至中溫(wen)下發(fa)生(sheng)交聯反應(ying)而成(cheng)為彈性(xing)體。具(ju)有(you)(you)良好的(de)耐(nai)熱性(xing)、憎水性(xing)、電絕(jue)緣性(xing),同時由于活性(xing)端基的(de)引入(ru),使其(qi)具(ju)有(you)(you)優(you)異的(de)物(wu)理機械性(xing)能,尤(you)其(qi)是(shi)抗(kang)張強(qiang)度、相對伸長(chang)和撕(si)裂強(qiang)度上有(you)(you)了明顯的(de)提高(gao)。適用于多種硫(liu)(liu)化方法,如(ru)輻射硫(liu)(liu)化、過(guo)氧化物(wu)硫(liu)(liu)化及加成(cheng)型(xing)(xing)(xing)硫(liu)(liu)化,廣泛用于耐(nai)熱、防(fang)潮、電絕(jue)緣、高(gao)強(qiang)度硅橡膠(jiao)(jiao)制品等方面。縮(suo)合(he)(he)型(xing)(xing)(xing)室(shi)(shi)溫(wen)硫(liu)(liu)化硅橡膠(jiao)(jiao)是(shi)以(yi)(yi)硅羥(qian)基與其(qi)他活性(xing)物(wu)質之(zhi)間(jian)的(de)縮(suo)合(he)(he)反應(ying)為特...
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工業壓力表的選用、安裝及使用注意事項
一、壓(ya)(ya)力(li)(差(cha)壓(ya)(ya))檢測(ce)(ce)儀(yi)表(biao)的(de)正(zheng)確(que)選(xuan)(xuan)用(yong)壓(ya)(ya)力(li)檢測(ce)(ce)儀(yi)表(biao)的(de)正(zheng)確(que)選(xuan)(xuan)用(yong)主要包(bao)括確(que)定(ding)儀(yi)表(biao)的(de)型式、量程、范(fan)圍、準確(que)度(du)和(he)(he)靈敏度(du)、外形尺寸以及(ji)是(shi)否需(xu)要遠傳和(he)(he)具有其(qi)它(ta)功能,如指示、記錄、調節、報警等(deng)(deng)。選(xuan)(xuan)用(yong)的(de)主要依據(ju):1.工(gong)藝生產過程對測(ce)(ce)量的(de)要求,包(bao)括量程和(he)(he)準確(que)度(du)。在靜態測(ce)(ce)試(或(huo)變(bian)化緩慢)的(de)情(qing)況下,規(gui)定(ding)被測(ce)(ce)壓(ya)(ya)力(li)的(de)zui大值(zhi)(zhi)選(xuan)(xuan)用(yong)壓(ya)(ya)力(li)表(biao)滿刻度(du)值(zhi)(zhi)的(de)三分(fen)(fen)之二;在脈動(dong)(波動(dong))壓(ya)(ya)力(li)的(de)情(qing)況下,被測(ce)(ce)壓(ya)(ya)力(li)的(de)zui大值(zhi)(zhi)選(xuan)(xuan)用(yong)壓(ya)(ya)力(li)表(biao)滿刻度(du)值(zhi)(zhi)的(de)二分(fen)(fen)之一。常用(yong)壓(ya)(ya)力(li)檢測(ce)(ce)儀(yi)表(biao)的(de)準確(que)度(du)等(deng)(deng)級有0.4級、1.0級、1.5級和(he)(he)2.5級4個級...
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兩線制4-20mA變送器工作原理
工業上普遍需要(yao)測量(liang)(liang)各類非(fei)電(dian)物理量(liang)(liang),例如(ru)溫度(du)、壓(ya)力、速度(du)、角度(du)等(deng),都(dou)需要(yao)轉(zhuan)換成模擬(ni)量(liang)(liang)電(dian)信(xin)(xin)號才能(neng)傳(chuan)輸到幾百米外的(de)(de)控(kong)制室(shi)或顯示設(she)備上。這種將物理量(liang)(liang)轉(zhuan)換成電(dian)信(xin)(xin)號的(de)(de)設(she)備稱為(wei)變送(song)器。工業上zui廣泛采用的(de)(de)是(shi)用4~20mA電(dian)流(liu)(liu)來傳(chuan)輸模擬(ni)量(liang)(liang)。采用電(dian)流(liu)(liu)信(xin)(xin)號的(de)(de)原因是(shi)不容易(yi)受干擾(rao)。并且電(dian)流(liu)(liu)源(yuan)內阻無窮大(da),導線電(dian)阻串(chuan)聯在回(hui)路中不影(ying)響精度(du),在普通雙絞(jiao)線上可以(yi)傳(chuan)輸數百米。上限取(qu)20mA是(shi)因為(wei)防爆的(de)(de)要(yao)求:20mA的(de)(de)電(dian)流(liu)(liu)通斷引起的(de)(de)火花能(neng)量(liang)(liang)不足以(yi)引燃瓦斯。下限沒(mei)有取(qu)0mA的(de)(de)原因是(shi)為(wei)了能(neng)檢測斷線:正常工作時不會低...
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簡單介紹膜盒壓力表與膜片壓力表的區別
簡單(dan)介紹膜(mo)盒(he)壓(ya)力表與(yu)膜(mo)片壓(ya)力表的(de)區別采用(yong)膜(mo)盒(he)作為測(ce)(ce)量(liang)微(wei)(wei)小壓(ya)力的(de)敏感元(yuan)件。測(ce)(ce)量(liang)對銅合金不(bu)起(qi)腐(fu)(fu)蝕(shi)作用(yong)、無爆炸危(wei)險氣(qi)體的(de)微(wei)(wei)壓(ya)和(he)負(fu)(fu)壓(ya),廣泛應(ying)用(yong)于鍋爐通風(feng)、氣(qi)體管(guan)道、燃燒裝置等(deng)其他(ta)類似設(she)備上。不(bu)銹鋼膜(mo)盒(he)壓(ya)力表根(gen)據(ju)導壓(ya)系統及外殼均采用(yong)不(bu)銹鋼材料制(zhi)成。應(ying)用(yong)于耐腐(fu)(fu)蝕(shi)要求(qiu)(qiu)較高的(de)工(gong)藝流程(cheng)中(zhong)對各種(zhong)氣(qi)體介質的(de)微(wei)(wei)壓(ya)和(he)負(fu)(fu)壓(ya)的(de)測(ce)(ce)量(liang)。生產不(bu)銹鋼膜(mo)盒(he)壓(ya)力表參照原膜(mo)盒(he)壓(ya)力表的(de)結(jie)構(gou)特點(dian)而研制(zhi)的(de)具有(you)耐腐(fu)(fu)蝕(shi)作用(yong)的(de)微(wei)(wei)壓(ya)表。應(ying)用(yong)于鍋爐通風(feng)和(he)氣(qi)體管(guan)道等(deng)設(she)備上,在耐腐(fu)(fu)要求(qiu)(qiu)較高的(de)工(gong)藝流程(cheng)中(zhong)測(ce)(ce)量(liang)各種(zhong)氣(qi)體介質的(de)微(wei)(wei)壓(ya)和(he)負(fu)(fu)壓(ya)。度等(deng)級(ji):...
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耐高溫電力電纜發展趨勢走向
近些年來,通過引進國(guo)(guo)(guo)外(wai)成套技術、設備(bei)和(he)原材料,我(wo)國(guo)(guo)(guo)電(dian)(dian)力電(dian)(dian)纜制造(zao)業已(yi)經具備(bei)大批量工業化連續生(sheng)產電(dian)(dian)壓(ya)等級(ji)從1kV至220kV各(ge)類規(gui)格和(he)品種交聯聚乙烯(xi)電(dian)(dian)力電(dian)(dian)纜的(de)(de)能(neng)力,產品不僅能(neng)夠*國(guo)(guo)(guo)內需求(qiu),而且(qie)部分(fen)出口海外(wai)。國(guo)(guo)(guo)產線纜產品質量和(he)執行(xing)的(de)(de)標(biao)準已(yi)與*水(shui)平接(jie)軌,絕(jue)大部分(fen)企(qi)業已(yi)通過ISO9000質量保證體系(xi)認證,為我(wo)國(guo)(guo)(guo)城鄉電(dian)(dian)網改造(zao)提供了大量的(de)(de)產品。其中耐高溫(wen)電(dian)(dian)力電(dian)(dian)纜該分(fen)支行(xing)業發(fa)展(zhan)前景被一致看好。國(guo)(guo)(guo)內電(dian)(dian)纜行(xing)業里(li)有些電(dian)(dian)纜公司之所以爭上立塔生(sheng)產線,各(ge)自的(de)(de)目的(de)(de)不同(tong),有的(de)(de)是確實想爭取大型水(shui)力發(fa)電(dian)(dian)站和(he)抽(chou)水(shui)...
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電站常見問題分析
水(shui)電(dian)(dian)廠(chang)機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)溫(wen)測(ce)(ce)量(liang)(liang)系統運行情況直(zhi)接影響整(zheng)個電(dian)(dian)廠(chang)機(ji)組(zu)(zu)(zu)(zu)(zu)是否(fou)能夠安全運行,這因為(wei)機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)溫(wen)測(ce)(ce)量(liang)(liang)系統故障造成誤發信(xin)號會導(dao)致機(ji)組(zu)(zu)(zu)(zu)(zu)事故停機(ji)。這對于(yu)機(ji)組(zu)(zu)(zu)(zu)(zu)壽(shou)命及整(zheng)個電(dian)(dian)網都會造成極(ji)大(da)的(de)(de)影響,因此機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)溫(wen)測(ce)(ce)量(liang)(liang)系統在(zai)水(shui)電(dian)(dian)廠(chang)監控系統中占(zhan)有(you)很(hen)重要的(de)(de)地位。為(wei)了便于(yu)大(da)家(jia)理(li)解(jie)水(shui)電(dian)(dian)廠(chang)機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)溫(wen)測(ce)(ce)量(liang)(liang)系統的(de)(de)結(jie)構(gou),根據我們長時(shi)間服務(wu)水(shui)電(dian)(dian)廠(chang)以及為(wei)水(shui)電(dian)(dian)廠(chang)提供專門(men)的(de)(de)瓦(wa)溫(wen)測(ce)(ce)量(liang)(liang)電(dian)(dian)阻(RTD),我們在(zai)下(xia)(xia)面(mian)將對水(shui)電(dian)(dian)廠(chang)機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)溫(wen)測(ce)(ce)溫(wen)系統結(jie)構(gou)做一個簡(jian)單的(de)(de)描(miao)述。水(shui)電(dian)(dian)廠(chang)機(ji)組(zu)(zu)(zu)(zu)(zu)瓦(wa)一般包括上導(dao)瓦(wa)、下(xia)(xia)導(dao)瓦(wa)、推(tui)力瓦(wa)、水(shui)導(dao)瓦(wa),瓦(wa)的(de)(de)材料有(you)巴氏合金瓦(wa)、俄羅斯...