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超声波液位开关在粘稠介质液位控制中的应用
2020-11-12
  

摘要:超声波液位开关利用超声波发射、接收换能器之间介质变化时引起声阻抗变化的原理来进行液位的监测。和其它液位开关相比,超声波液位开关的液位测试只与被测介质的声阻抗参数有关,与介质的粘度无关,因此克服了其它液位开关受介质粘度影响的缺点,产品可广泛应用于石油、化工、食品、饮料等行业。

关键词:超声波,液位开关,声阻,粘稠介质

Abstract:The change of medium between ultrasonic transmitting and receiving transducer leads to the change of the acoustic impedance, and ultrasonic liquid level switch uses the principle for liquid level monitoring. Compared to other liquid level switches, level test of ultrasonic liquid level switch is only related to the acoustic impedance parameters of the measured medium, which has nothing to do with the viscosity of the medium. The ultrasonic liquid level switch overcomes the shortcomings that other liquid level switches are affected by the medium viscosity, and these products have been widely used in petroleum, chemical industry, food, beverage and other industries.

Key words: ultrasonic, liquid level switch,acoustic resistance, viscous medium

1引言

YEWEIKAIGUANBAOKUOFUQIUYEWEIKAIGUAN、YINCHAYEWEIKAIGUAN、DIANRONGSHIYEWEIKAIGUANYIJIZHENGZAIXINGQIDECHAOSHENGYEWEIKAIGUANDENG。

YIZHIYILAI,DABUFENYEWEIKAIGUANDUIZHANDUDADEJIEZHIJINXINGYEWEIJIANCESHI,DOUCUNZAIFANYINGSHIJIANZHIHOU、SHANGXIADONGZUODIANLUOCHADA、SHIYONGSHOUMINGDUAN、JIYICHANSHENGWUBAOJINGDENGCELIANGWENTI。

FUQIUYEWEIKAIGUANZHUYAOTONGGUOFUQIUDESHANGXIASHENGJIANGLAIJIANCEYEMIANDEBIANHUA,ZAICELIANGZHANCHOUXINGHUOZHEHANZAZHIYETISHI,RONGYIZAOCHENGFUQIUDUSAI,CHANSHENGFUZISHANGFUHEXIAJIANGMANXIANXIANG。

YINCHAYEWEIKAIGUANZHUYAOTONGGUOCELIANGLIANGGEZHENDONGYINCHAJIANJIEZHIBIANHUASHIGONGZHENPINLVDEBIANHUALAIJIANCEYEWEIDEBIANHUA。YINCHAYEWEIKAIGUANZAICELIANGZHANDUJIEZHISHI,CHATIRONGYIBEIZHANLIANZAIYIQIDECHAJIANWULIAODUIJI,CONGERCHANSHENGWUBAOJING。

电容式液位开关通过检测液面或者散料高度变化时电容值的变化来测量液位或料位的高度。当测量粘稠介质时容易形成开关杆体挂料,从而影响模拟量的输出而产生误报警[2]

ERCHAOSHENGBOYEWEIKAIGUANLIYONGCHAOSHENGBOZAIKONGQIHEYETIZHONGDECHUANBOTEXINGLAIJIANCEYETIDEYEWEI,KEYIKEFUZHANCHOUJIEZHIYEWEIDECELIANGKONGZHIWENTI,ZUIDADONGLIZHANDUKECELIANGDAO7000mpa.s,SHISHIYOU、HUAGONGXINGYEGAOZHANCHOUDUYETIYEWEICELIANGKONGZHIDEYOUXUANCHANPIN。BINGQIEQIJIEGOUJINGQIAO,MEIYOUJIXIEBUJIAN,XINGNENGWENDINGKEKAO。ANZHUANGFANGSHIDUOYANG,JIKEDINGBUANZHUANG,YEKECEBUANZHUANG,HAIYOULIANGDIANSHIJIEGOU,KEYIMANZUGEZHONGGONGKUANG。

2产品原理

CHAOSHENGBOYEWEIKAIGUANLIYONGCHAOSHENGBOZAIKONGQIHEYETIZHONGDECHUANBOTEXINGLAIJIANCEYETIDEYEWEI。YOUYUHUANNENGQIBIAOMIANCAILIAODESHENGZUKANG(SHENGZUKANGZ=MIDUρ*SHENGSUC)YUKONGQIDESHENGZUKANGXIANGCHAJUDA,SHENGBOZAIKONGQIZHONGDEFASHE、JIESHOUKUNNAN;ERQIESHENGBOZAIQITIZHONGCHUANBOSHIDESHUAIJIANYEBIYETIZHONGDADEDUO,YINCI,SHENGBOZAIKONGQIZHONGCHUANBOSHIJIHUMEIYOUXINHAO,ERZAIYETIZHONGCHUANBOSHIXINHAOHENQIANG。TONGGUOJIANCESHENGBOJIESHOUXINHAODEDAXIAOHUOQIANGDUKEYIYONGLAIJIANCEYEWEI。

WEILEDADAOYEWEIJIANCEDEMUDE,SHEJIDECHAOSHENGBOYEWEIKAIGUANCHUANGANQICAIYONGLERUTU1SUOSHIDEAOCAOXINGJIEGOU。

TU1 CHAOSHENGBOYEWEIKAIGUANCHUANGANQISHIYITU

       图中,凹槽二端的内壁面上分别安装了一个超声发射晶片和一个超声接收晶片,用于超声波的发射和接收。当凹槽内存在液体时,液位开关电路检测到的声波接收信号强度较大,而当凹槽内存在气体(空气)时,液位开关电路检测到的声波接收信号极为微弱[1]。液位开关电路根据检测到的声波信号的强度不同来实时判断液位,并相应地输出继电器开关信号来控制液位。

3超声波液位开关的优点分析

    CHAOSHENGBOYEWEIKAIGUANJUYOURUXIAYOUDIAN:

(1)XIANGYINGSUDUKUAI:CHAOSHENGBOYEWEIKAIGUANLIYONGYETIHEKONGQISHENGZUKANGDEBUTONG,LAIKUAISUZHUNQUEDEQUFENSHIFOUYOUYEDAODACESHIDIAN,FANYINGLINGMIN。

(2)WUCHAXIAO:DANGYETICHONGMANAOCAOSHI,LIKEJIUHUIBEIJIANCEWEIYOUYEZHUANGTAI;DANGYETILIKAIAOCAOSHANGMIANDEYIGEMIANSHI,LIKEJIUHUIBEIJIANCEWEIWUYEZHUANGTAI。ZHEIYANGSHANGXIAYEWEIDELUOCHADIANHENXIAO,JIBENBAOCHIYIZHI,ZHONGFUXINGWUCHA±2mm。

(3)SHIYONGSHOUMINGZHANG:YETIJIEZHIDEZHANDUDUICHAOSHENGBOKAIGUANDEYINGXIANGHENXIAO,JIBENBUYONGBAOYANG;ERQIEKAIGUANWEIQUANDIANZIBUJIAN,MEIYOUJIXIEBUJIAN,KECHANGNIANSHIYONGBUYONGWEIHU。

(4)LIANJIEFANGSHIDUOYANG:RUTU2SUOSHI,CHAOSHENGBOYEWEIKAIGUANDEJIEGOUYOUDINGZHUANGJIEGOU、CEZHUANGJIEGOUHELIANGDIANSHIJIEGOU(LIANGDIANSHIJIEGOUKECELIANGKONGZHILIANGGEYEWEIBAOJINGDIAN)。ANZHUANGFANGSHIBAOKUOLUOWENLIANJIE、FALANLIANJIEHEWEISHENGXINGLIANJIE,MANZUGEZHONGGONGKUANGYAOQIU。

 

TU2 KAIGUANJIEGOU:DINGZHUANGJIEGOU、CEZHUANGJIEGOU、LIANGDIANSHIJIEGOU、MINIWEISHENGXING

4产品应用情况

CHAOSHENGBOYEWEIKAIGUANBUFENJIEZHIJULISHUOMING:

名称

温度

动力粘度(mPa.s)

纸胶水

30

3000

洗洁精

22

1470

糖浆

70

4000

工业胶

25

7000

原油

30

829

CHAOSHENGBOYEWEIKAIGUANLIYONGJIEZHISHENGZUKANGYUANLIJINXINGCESHI,KEYICELIANGGAOZHANDUDEYETI。DANSHI,RUGUOJIEZHIZHONGHUNYOUDALIANGDEKELIWUHUOQIPAO,HUIYINGXIANGCELIANGXIAOGUO,BUJIANYIZAILEISIGONGKUANGXIAYINGYONG。

5产品的发展前景

目前,超声波液位开关多为国外品牌,如SOR、Gems、TE、MOBREY等公司产品,由于国外的超声波液位开关价格高、服务滞后、无法定制,制约了市场的需求[3]。江苏1分快三计划科技有限公司2016年研制成功的超声波液位开关,填补了国内空白,成功应用于油品储罐、化工设备、制胶设备和食品机械等领域,其性能稳定,反应灵敏,解决了其它液位开关不能用于粘稠介质液位测量的问题,使过程控制自动化成为可能,既提高了设备的安全性,也降低了工人的劳动强度。

参考文献:

[1]LIUYANYAN. CHAOSHENGBOYEWEIJIDEYANJIU[D].BEIJINGHUAGONGDAXUE,2007.

[2] CAIWENZHI. YEWEIYIBIAODEXUANZE[J]. DIANSHIJIE,1999,(03):8-10.

[3]LIUQING. JINRUSHISHOUFAYITICHAOSHENGBOYEWEIJIANCEYANJIU[D].GUANGXISHIFANDAXUE,2015.

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