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微(wei)波枯燥(zao)体系

微波枯燥体系

     微波枯燥体系首要由微波发生器(包含直流电源、微波管等)、导波装配、微波利用装配(或称财产微波炉体)及冷却体系、传动体系、节制体系及宁静掩护体系等局部构成。微波管由直流电源供给高压并转化为微波能;也能够或许接纳财产交换电源(50Hz、380V)经三相全波桥式整流电路,由多抽头的高压变压器和整流硅堆发生平直的高压直流电。今朝,用于加热枯燥的微波管首要是磁控管和速调管。

     1  电(dian)(dian)(dian)(dian)(dian)源(yuan)  电(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)首要(yao)使(shi)命(ming)是(shi)供(gong)给微(wei)波督(du)任务所(suo)须(xu)要(yao)的(de)(de)(de)(de)直流(liu)(liu)高压(ya)电(dian)(dian)(dian)(dian)(dian)源(yuan),对(dui)(dui)非包装衰落(luo)波管还需供(gong)给直流(liu)(liu)磁场电(dian)(dian)(dian)(dian)(dian)源(yuan)。接(jie)纳(na)的(de)(de)(de)(de)直流(liu)(liu)电(dian)(dian)(dian)(dian)(dian)源(yuan)都(dou)是(shi)经常利用的(de)(de)(de)(de)整流(liu)(liu)电(dian)(dian)(dian)(dian)(dian)源(yuan)情势,但对(dui)(dui)各类差别型号的(de)(de)(de)(de)微(wei)波管,按照它们的(de)(de)(de)(de)特征、利用前提和功率(lv)巨细的(de)(de)(de)(de)差别,对(dui)(dui)电(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)请(qing)求也差别。小功率(lv)的(de)(de)(de)(de)微(wei)波加(jia)热(re)器,常接(jie)纳(na)单(dan)相(xiang)全波整流(liu)(liu)或单(dan)相(xiang)半(ban)(ban)波倍压(ya)整流(liu)(liu)电(dian)(dian)(dian)(dian)(dian)源(yuan)。单(dan)相(xiang)半(ban)(ban)波倍压(ya)整流(liu)(liu)电(dian)(dian)(dian)(dian)(dian)路中变压(ya)器选用漏磁变压(ya)器,其特色是(shi)当(dang)电(dian)(dian)(dian)(dian)(dian)源(yuan)电(dian)(dian)(dian)(dian)(dian)压(ya)降(jiang)低(di)、负(fu)载(zai)电(dian)(dian)(dian)(dian)(dian)源(yuan)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)增大时,由于(yu)漏磁的(de)(de)(de)(de)感(gan)化可(ke)主动坚持负(fu)载(zai)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不变,这就使(shi)磁控督(du)任务不变。这类电(dian)(dian)(dian)(dian)(dian)路体积小、经济(ji)、不变、宁静靠得住。

      用于大功率(lv)微波枯燥器的电(dian)(dian)源,都接纳三相全波桥式(shi)整流(liu)电(dian)(dian)路。由于它发生的电(dian)(dian)压(ya)靠近(jin)于平直的直流(liu)电(dian)(dian)压(ya),是(shi)以请求电(dian)(dian)源的内阻(zu)越(yue)小越(yue)好。如许(xu),当磁控(kong)管一般任务前后,即电(dian)(dian)源空(kong)载(zai)和(he)有载(zai)环境下,直流(liu)高压(ya)变(bian)更(geng)不大,使(shi)磁控(kong)管了作(zuo)不变(bian)。若(ruo)是(shi)电(dian)(dian)路内阻(zu)过大,会致(zhi)使(shi)电(dian)(dian)源电(dian)(dian)压(ya)过大,出格是(shi)在空(kong)载(zai)状况下杏(xing)能够或(huo)许(xu)致(zhi)使(shi)磁控(kong)管起振时发生非(fei)π情(qing)势振荡。

      2  微(wei)波管  磁(ci)控管由铜(tong)制成(cheng)(cheng)的(de)(de)(de)空芯阳(yang)极(ji)(ji)(具备谐振(zhen)腔(qiang)布局)和位于此(ci)中(zhong)间的(de)(de)(de)发射电(dian)(dian)(dian)(dian)子的(de)(de)(de)阴极(ji)(ji)构成(cheng)(cheng),本色上是一个置于恒定磁(ci)场的(de)(de)(de)二极(ji)(ji)管。当阴极(ji)(ji)与阳(yang)极(ji)(ji)之间存在有必然的(de)(de)(de)直流电(dian)(dian)(dian)(dian)届(jie)时,从阴极(ji)(ji)发射的(de)(de)(de)电(dian)(dian)(dian)(dian)子受阳(yang)极(ji)(ji)正电(dian)(dian)(dian)(dian)位感(gan)化而(er)朝阳(yang)极(ji)(ji)加快(kuai)活(huo)动,在彼此(ci)垂(chui)直的(de)(de)(de)电(dian)(dian)(dian)(dian)场、磁(ci)场的(de)(de)(de)感(gan)化下,电(dian)(dian)(dian)(dian)子从电(dian)(dian)(dian)(dian)场中(zhong)取得能(neng)量并做圆周(zhou)活(huo)动,在阳(yang)极(ji)(ji)谐振(zhen)腔(qiang)的(de)(de)(de)感(gan)化下发生所需的(de)(de)(de)微(wei)波能(neng)。若使只的(de)(de)(de)频次更高或在大功率的(de)(de)(de)场所下则常接纳(na)速调(diao)管。速调(diao)管由电(dian)(dian)(dian)(dian)子枪(qiang)(包含阴极(ji)(ji)、热子、聚速电(dian)(dian)(dian)(dian)极(ji)(ji))、谐振(zhen)腔(qiang)及输(shu)出(chu)、输(shu)出(chu)讨论和搜集(ji)极(ji)(ji)等构成(cheng)(cheng)。

      3  波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)  微(wei)波(bo)(bo)(bo)(bo)管(guan)发生的(de)(de)微(wei)波(bo)(bo)(bo)(bo)经(jing)由进程波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)传(chuan)输给利用装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei),即(ji)波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)是一种(zhong)导(dao)(dao)(dao)(dao)波(bo)(bo)(bo)(bo)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)。从狭(xia)义上讲(jiang),但(dan)凡(fan)能(neng)(neng)够(gou)或(huo)许指导(dao)(dao)(dao)(dao)电(dian)磁波(bo)(bo)(bo)(bo)传(chuan)输的(de)(de)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)都(dou)可作(zuo)为(wei)波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)。人们熟习的(de)(de)双(shuang)线(xian)传(chuan)输线(xian)和同轴(zhou)电(dian)缆都(dou)是导(dao)(dao)(dao)(dao)波(bo)(bo)(bo)(bo)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)。可是,当(dang)频(pin)次(ci)较高时(shi),用双(shuang)线(xian)传(chuan)输线(xian)作(zuo)为(wei)导(dao)(dao)(dao)(dao)波(bo)(bo)(bo)(bo)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)的(de)(de)消耗将急剧(ju)增大,同时(shi)电(dian)磁波(bo)(bo)(bo)(bo)向(xiang)外(wai)(wai)辐射的(de)(de)景象(xiang)也将逐(zhu)步较着。若是改用同轴(zhou)电(dian)缆作(zuo)为(wei)导(dao)(dao)(dao)(dao)波(bo)(bo)(bo)(bo)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei),电(dian)磁波(bo)(bo)(bo)(bo)向(xiang)外(wai)(wai)辐射的(de)(de)能(neng)(neng)够(gou)或(huo)许性固然(ran)削减,但(dan)当(dang)频(pin)次(ci)持续(xu)进步时(shi)能(neng)(neng)量消耗将愈(yu)(yu)来愈(yu)(yu)大以(yi)(yi)致(zhi)没法一般(ban)任务。是以(yi)(yi),为(wei)了(le)削减传(chuan)输耗,并避免电(dian)磁波(bo)(bo)(bo)(bo)向(xiang)外(wai)(wai)辐射,接纳空心(xin)的(de)(de)导(dao)(dao)(dao)(dao)电(dian)金属装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)作(zuo)为(wei)传(chuan)输电(dian)磁能(neng)(neng)量的(de)(de)导(dao)(dao)(dao)(dao)波(bo)(bo)(bo)(bo)装(zhuang)(zhuang)(zhuang)配(pei)(pei)(pei)。最经(jing)常利用的(de)(de)矩形波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)又(you)分(fen)为(wei)直(zhi)管(guan)波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)、波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)分(fen)支(或(huo)T型讨论)、弯波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)和扭波(bo)(bo)(bo)(bo)导(dao)(dao)(dao)(dao)等。  

      4  利用(yong)装(zhuang)配(pei)(pei)  微波能发生后,经波导(dao)传输出(chu)利用(yong)装(zhuang)配(pei)(pei),今朝(chao)利用(yong)装(zhuang)配(pei)(pei)的(de)(de)首要情(qing)(qing)势(shi)(shi)有多模微波炉、单模谐振腔和行波型利用(yong)装(zhuang)配(pei)(pei)3种(zhong)情(qing)(qing)势(shi)(shi)。波导(dao)自身也可作为(wei)利用(yong)装(zhuang)配(pei)(pei),由(you)(you)(you)于在波导(dao)中间(jian)的(de)(de)电场(chang)强度(du)最大(da),能够(gou)或(huo)许让物(wu)料(liao)(liao)经由(you)(you)(you)进程(cheng)该强电场(chang)地区而获得(de)有用(yong)的(de)(de)加热,如加热丝状物(wu)料(liao)(liao)。按照物(wu)料(liao)(liao)经由(you)(you)(you)进程(cheng)利用(yong)装(zhuang)配(pei)(pei)的(de)(de)体例(li),其(qi)又能够(gou)或(huo)许分为(wei)持续(xu)式和间(jian)歇式两种(zhong)。

 

 

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