美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)就(jiu)是(shi)利(li)用(yong)正壓(ya)氣(qi)源(yuan)產(chǎn)(chan)生負(fu)壓(ya)的壹(yi)種(zhong)新型(xing),,清(qing)潔,經(jīng)濟(ji),小(xiao)型(xing)的真(zhen)空(kong)元(yuan)器(qi)件,這使得(de)在有壓(ya)縮空(kong)氣(qi)的地(di)方(fang),或(huo)在壹個(ge)氣(qi)動(dong)系統(tǒng)(tong)中同(tong)時(shi)需(xu)要(yao)正負(fu)壓(ya)的地(di)方(fang)獲(huo)得(de)負(fu)壓(ya)變(bian)得(de)十分容易和(he)方(fang)便(bian).美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)廣(guang)泛應用(yong)在工業(yè)(ye)自(zi)動(dong)化(hua)中機(ji)械(xie),電(dian)子(zi),包(bao)裝(zhuang),印刷(shua),塑(su)料及(ji)機器(qi)人等(deng)領域(yu).真(zhen)空(kong)發(fā)生(sheng)器(qi)的傳(chuan)統(tǒng)用(yong)途是(shi)吸(xi)盤(pan)配(pei)合,進(jin)行(xing)各種(zhong)物料的吸(xi)附(fu),搬(ban)運(yun),尤其(qi)適(shi)合於(yu)吸(xi)附易碎,柔(rou)軟,薄(bo)的非(fei)鐵,非金屬(shu)材料或球型(xing)物(wu)體(ti).在這類(lei)應(ying)用(yong)中,壹(yi)個(ge)共(gong)同(tong)特點(dian)是(shi)所(suo)需(xu)的抽(chou)氣(qi)量小(xiao),真空(kong)度要求不(bu)高(gao)且為(wei)間(jian)歇(xie)工作.美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的抽(chou)吸(xi)機理(li)和(he)影響(xiang)其(qi)工作性能因(yin)素(su)的分(fen)析(xi)研究(jiu),對(dui)正負(fu)壓(ya)氣(qi)路(lu)的設(she)計(ji)和(he)選(xuan)用(yong)有著不(bu)可忽視(shi)的實(shi)際(ji)意(yi)義.真(zhen)空(kong)發(fā)生(sheng)器(qi)快易(yi)優(yōu)自(zi)動(dong)化(hua)選(xuan)型(xing)有(you)收(shou)錄(lu)。美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)安裝(zhuang)使用(yong)註意(yi)事(shi)項 1、附帶(dai)機(ji)械(xie)式真(zhen)空(kong)開關的類(lei)型(xing)。
2、真(zhen)空(kong)發(fā)生(sheng)器(qi)簡(jian)單構(gou)造，使(shi)用(yong)壽命長。
3、有耐(nai)化(hua)學(xue)藥品(pin)、耐(nai)瓦斯用(yong)材質(zhi)，可在各種(zhong)環(huán)境使用(yong)。真空(kong)發(fā)生(sheng)器(qi)所(suo)產(chǎn)(chan)生的真(zhen)空(kong)度可達(da)90Kpa以(yi)上，可按客(ke)戶要(yao)求定(ding)制化(hua)批(pi)量生產(chǎn)(chan)。
遲滯(zhi)，OP [mm]：2
當考慮泄(xie)漏時(shi),美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的特(te)性(xing)曲(qu)線對(dui)正確(que)確(que)定(ding)真(zhen)空(kong)發(fā)生(sheng)器(qi)非常(chang)重要.泄(xie)漏有時(shi)是(shi)不(bu)可避免的,當有泄漏時(shi)確(que)定(ding)真(zhen)空(kong)發(fā)生(sheng)器(qi)的大(da)小(xiao)的方(fang)法(fa)如(ru)下:把(ba)名(ming)義吸(xi)入(ru)流量與泄(xie)漏流量相加(jia),可查出(chu)真(zhen)空(kong)發(fā)生(sheng)器(qi)的大(da)小(xiao).
其(qi)中VG-010-00-00系列(lie)尺寸緊湊(cou)，易於安裝(zhuang)。它(ta)們(men)采用(yong)輕(qing)質結構(gou)，可在車(che)間(jian)空(kong)氣(qi)中運(yun)行(xing)，因(yin)此使(shi)用(yong)起來(lai)非(fei)常經(jīng)(jing)濟(ji)。這些Gast真(zhen)空(kong)發(fā)生(sheng)器(qi)無需(xu)移動(dong)部(bu)件，只(zhi)需極少(shao)的維(wei)護(hu)，操(cao)作非常(chang)安(an)靜。
通過調節(jié)(jie)入(ru)口壓(ya)力來控(kong)制真空(kong)水(shui)平(ping)，並(bing)且(qie)可以通(tong)過控制入(ru)口壓(ya)力來開(kai)啟(qi)和(he)關閉發(fā)電(dian)機(ji)，而(er)不(bu)是(shi)通(tong)過排放到大氣(qi)來(lai)調節(jié)(jie)真空(kong)管線。在規(guī)(gui)定(ding)的入(ru)口壓(ya)力下實(shi)現(xiàn)(xian)高性(xing)能和(he)低(di)噪(zao)音(yin)。
按噴管出口馬(ma)赫數(shù)(shu)M1(出(chu)口流速(su)與當?shù)芈?sheng)速(su)之比)分類(lei),真(zhen)空(kong)發(fā)生(sheng)器(qi)可分為(wei)亞(ya)聲(sheng)速(su)噴管型(xing)(M1<1),聲(sheng)速(su)噴管型(xing)(M1=1)和(he)超聲(sheng)速(su)噴管型(xing)(M1>1).亞(ya)聲(sheng)速(su)噴管和(he)聲(sheng)速(su)噴管都是(shi)收(shou)縮噴管,而(er)超聲(sheng)速(su)噴管型(xing)必(bi)須(xu)是(shi)先(xian)收(shou)縮後擴張(zhang)形噴管(即Laval噴嘴(zui)).為(wei)了(le)得(de)到大(da)吸入(ru)流量或高(gao)吸(xi)入(ru)口處壓(ya)力,美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)都設計(ji)成(cheng)超聲(sheng)速(su)噴管型(xing).
GAST嘉(jia)仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)對於(yu)不(bu)可壓(ya)縮空(kong)氣(qi)氣(qi)體(ti)(氣(qi)體(ti)在低(di)速(su)進(jin),可近似認(ren)為(wei)是(shi)不(bu)可壓(ya)縮空(kong)氣(qi))的連續(xù)性方(fang)程(cheng)：
A1v1= A2v2
式(shi)中A1,A2----管道的截面(mian)面(mian)積,m2
v1,v2----氣(qi)流流速(su),m/s
由上(shang)式可知(zhi),截面(mian)增大,流速(su)減小(xiao);截面(mian)減小(xiao),流速(su)增大(da).
對於(yu)水(shui)平(ping)管路,按不(bu)可壓(ya)縮空(kong)氣(qi)的伯(bo)努裏(li)理(li)想能量方(fang)程(cheng)為(wei)
P1+（1/2）*ρv1^2=P2+(1/2)ρv2^2
式(shi)中P1,P2----截面(mian)A1,A2處相應的壓(ya)力,Pa
v1,v2----截面(mian)A1,A2處相應的流速(su),m/s
ρ----空(kong)氣(qi)的密度(du),kg/m3
由上(shang)式(shi)可知(zhi),流速(su)增大(da),壓(ya)力降(jiang)低(di),當v2>v1時(shi),P1>P2.當v2增加到(dao)壹(yi)定(ding)值(zhi),P2將小(xiao)於壹個大氣(qi)壓(ya)務(wu),即產(chǎn)(chan)生負(fu)壓(ya).故(gu)可用(yong)增大(da)流速(su)來獲(huo)得(de)負(fu)壓(ya),產(chǎn)(chan)生吸(xi)力.
美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的參(can)數(shù)(shu)：
①空(kong)氣(qi)消(xiao)耗(hao)量:指從(cong)噴管流出的流量qv1.
②吸入(ru)流量:指從(cong)吸(xi)口吸(xi)入(ru)的空(kong)氣(qi)流量qv2.當吸入(ru)口向(xiang)大氣(qi)敞(chang)開(kai)時(shi),其(qi)吸入(ru)流量大,稱為(wei)大(da)吸(xi)入(ru)流量qv2max.
③吸入(ru)口處壓(ya)力:記為(wei)Pv.當吸入(ru)口被(bei)*封閉(如(ru)吸(xi)盤吸著工件),即吸入(ru)流量為(wei)零(ling)時(shi),吸(xi)入(ru)口內(nèi)(nei)的壓(ya)力低(di),記(ji)作Pvmin.
④吸著響(xiang)應時(shi)間(jian):吸(xi)著響(xiang)應時(shi)間(jian)是(shi)表(biao)明(ming)真(zhen)空(kong)發(fā)生(sheng)器(qi)工作性能的壹(yi)個(ge)重要參(can)數(shù)(shu),它(ta)是(shi)指(zhi)從(cong)換向閥(fa)打開(kai)到(dao)系統(tǒng)(tong)回(hui)路(lu)中達(da)到(dao)壹個(ge)必要(yao)的真(zhen)空(kong)度的時(shi)間(jian).
美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的性(xing)能與噴管的小(xiao)直徑,收縮和(he)擴散管的形(xing)狀(zhuang),通(tong)徑及(ji)其(qi)相應位(wei)置和(he)氣(qi)源(yuan)壓(ya)力大小(xiao)等諸(zhu)多(duo)因(yin)素(su)有關(guan).
①大(da)吸(xi)入(ru)流量qv2max的特(te)性(xing)分析(xi):較(jiao)為(wei)理(li)想的美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的qv2max特(te)性(xing),要求在常用(yong)供(gong)給壓(ya)力範圍(wei),qv2max處於大值,且(qie)隨(sui)著P01的變(bian)化(hua)平(ping)緩.
②吸入(ru)口處壓(ya)力Pv的特(te)性(xing)分析(xi):較(jiao)為(wei)理(li)想的美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的Pv特(te)性(xing),要求在常用(yong)供(gong)給壓(ya)力範圍(wei)內(nèi)(nei)(P01=0.4---0.5MPa),Pv處於小(xiao)值,且隨(sui)著Pv1的變(bian)化(hua)平(ping)緩.
③在吸入(ru)口處*封閉的條(tiao)件(jian)下,對特(te)定(ding)條(tiao)件(jian)下吸入(ru)口處壓(ya)力Pv與吸(xi)入(ru)流量之間(jian)的關(guan)系如(ru)圖3所(suo)示.為(wei)獲(huo)得(de)較為(wei)理(li)想的吸(xi)入(ru)口處壓(ya)力與吸(xi)入(ru)流量的匹配(pei)關(guan)系,可設計(ji)成(cheng)多(duo)級美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)串聯(lián)(lian)組合在壹起.
④擴(kuo)散管的長度應保(bao)證噴管出口的各(ge)種(zhong)波系充分發(fā)展(zhan),使(shi)擴(kuo)散管道出(chu)口截面(mian)上能獲(huo)得(de)近似的均(jun)勻(yun)流動(dong).但(dan)管道過長,管壁(bi)摩(mo)擦(ca)損(sun)失(shi)增(zeng)大(da).壹般管道長為(wei)管徑的6---10倍(bei)較為(wei)合理(li).為(wei)了(le)減少(shao)能量損(sun)失(shi),可在擴散管直管道的出(chu)口加(jia)壹個(ge)擴張(zhang)角為(wei)6°---8°的擴(kuo)張(zhang)段.
⑤吸著響(xiang)應時(shi)間(jian)與吸(xi)附(fu)腔的容積有(you)關(包(bao)括(kuo)擴散腔(qiang),吸(xi)附管道及(ji)吸盤(pan)或(huo)密閉艙(cang)容積等(deng)),吸附(fu)表面(mian)的泄(xie)漏量與所(suo)需(xu)吸(xi)入(ru)口處壓(ya)力的大(da)小(xiao)有關.對壹定(ding)吸(xi)入(ru)口處壓(ya)力要求來(lai)說,若吸附(fu)腔的容積越小(xiao),響(xiang)應時(shi)間(jian)越短;若吸入(ru)口處壓(ya)力越高,吸附容積越小(xiao),表面(mian)泄漏量越小(xiao),則吸著響(xiang)應時(shi)間(jian)亦越短;若吸附(fu)容積大(da),且吸(xi)著速(su)度要(yao)快,則(ze)美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的噴嘴(zui)直徑應越大.
⑥美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)在滿(man)足使(shi)用(yong)要求的前(qian)提下應減小(xiao)其(qi)耗(hao)氣(qi)量(L/min),耗(hao)氣(qi)量與壓(ya)縮空(kong)氣(qi)的供(gong)給壓(ya)力有關(guan),壓(ya)力越大,則真空(kong)發(fā)生(sheng)器(qi)的耗(hao)氣(qi)量越大.因(yin)此在確(que)定(ding)吸(xi)入(ru)口處壓(ya)力值的大(da)小(xiao)時(shi)要(yao)註(zhu)意(yi)系統(tǒng)(tong)的供(gong)給壓(ya)力與耗(hao)氣(qi)量的關(guan)系,壹(yi)般美國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)所(suo)產(chǎn)(chan)生的吸(xi)入(ru)口處壓(ya)力在20kPa到10kPa之(zhi)間(jian).此(ci)時(shi)供(gong)表壓(ya)力再增加,吸入(ru)口處壓(ya)力也不(bu)會(hui)再降(jiang)低(di)了(le),而(er)耗(hao)氣(qi)量卻增(zeng)加(jia)了(le).因(yin)此降(jiang)低(di)吸(xi)入(ru)口處壓(ya)力應從(cong)控制流速(su)方(fang)面(mian)考慮.
⑦有時(shi)由(you)於(yu)工(gong)件的形(xing)狀(zhuang)或(huo)材(cai)料的影(ying)響(xiang),很難獲(huo)得(de)較低(di)的吸(xi)入(ru)口處壓(ya)力,由於(yu)從吸(xi)盤邊(bian)緣(yuan)或(huo)通過工件(jian)吸入(ru)空(kong)氣(qi),而(er)造成(cheng)吸入(ru)口處壓(ya)力升(sheng)高(gao).在這種(zhong)情(qing)況(kuang)下,就(jiu)需(xu)要正確(que)選(xuan)擇(ze)美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi)的尺寸,使其(qi)能夠(gou)補償(chang)泄漏造成(cheng)的吸(xi)入(ru)口處壓(ya)力升(sheng)高(gao).由(you)於很難知(zhi)道泄(xie)漏時(shi)的有(you)效(xiao)截面(mian)積,可以通(tong)過壹個(ge)簡(jian)單的試(shi)驗來(lai)確(que)定(ding)泄(xie)漏造成(cheng)的吸(xi)入(ru)口處壓(ya)力升(sheng)高(gao).由(you)於很難知(zhi)道泄(xie)漏時(shi)的有(you)效(xiao)截面(mian)積,可以通(tong)過壹個(ge)簡(jian)單的試(shi)驗來(lai)確(que)定(ding)泄(xie)漏量.試驗回(hui)路(lu)由(you)工件(jian),美(mei)國GAST嘉仕(shi)達(da)真(zhen)空(kong)發(fā)生(sheng)器(qi),吸盤(pan)和(he)真空(kong)表組成(cheng),由真(zhen)空(kong)表的顯(xian)示讀數(shù)(shu),再查真(zhen)空(kong)發(fā)生(sheng)器(qi)的性(xing)能曲(qu)線,可很容易知(zhi)道泄(xie)漏量的大(da)小(xiao)。
上壹篇
介紹美(mei)國GAST馬達(da)的故(gu)障(zhang)分(fen)析 下壹篇(pian)
SEL-2414變(bian)壓(ya)器(qi)監(jiān)控(kong)器(qi)的功(gong)能詳細(xi)介紹
