Kodi thermostat ndi chiyani?
Owongolera kutentha ali ndi mayina osiyanasiyana, monga kusintha kwa kutentha, zotetezera kutentha ndi zowongolera kutentha. Malinga ndi mfundo yogwirira ntchito, imatha kugawidwa mumtundu wa jumper thermostat, thermostat yamadzimadzi, mtundu wa pressure thermostat ndi electronic type thermostat. Pazida zamakono zowongolera mafakitale, digito thermostat ndi mtundu womwe umagwiritsidwa ntchito kwambiri. Malinga ndi kapangidwe kake, wowongolera kutentha amatha kugawidwa kukhala wowongolera kutentha wophatikizika ndi wowongolera kutentha wa modular.
Kodi ma thermometers ndi chiyani?
Thupi loyezera kutentha ndi gawo lomwe limasintha chizindikiro cha kutentha kukhala chizindikiro chamagetsi, ndipo nthawi zambiri chimayikidwa mu gawo lodziwika la chinthu cholamulidwa kuti chiyang'ane kutentha kwake. Pankhani yoyang'anira mafakitale, ma thermometers omwe amagwiritsidwa ntchito nthawi zambiri amaphatikiza ma thermocouples, ma resistors amafuta, ma thermistors ndi masensa osalumikizana. Mwa iwo, atatu oyamba ndi ma thermometers olumikizana.
1. Thermocouple
Mfundo yoyezera kutentha kwa thermocouples imachokera ku Seebeck effect (thermoelectric effect). Pamene zitsulo ziwiri za zipangizo zosiyana (kawirikawiri ma conductor kapena semiconductors, monga platinamu-rhodium, faifi tambala-chromium-nickel-silicon ndi zipangizo zina zophatikizidwa) zimapanga chipika chotsekedwa ndikugwiritsa ntchito kutentha kosiyana ku malekezero awo awiri olumikiza, mphamvu ya electromotive imapangidwa pakati pawo. zitsulo ziwiri. Kuzungulira kotereku kumatchedwa "thermocouple," pamene zitsulo ziwirizi zimatchedwa "electrode yotentha," ndipo chifukwa cha mphamvu ya electromotive imatchedwa "thermoelectric motive force." Ma Thermocouples amadziwika ndi kusiyanasiyana kwawo koyezera kutentha, kuyankha mwachangu, komanso kukana kugwedezeka kwamphamvu.
2. Kukana kutentha
Kukaniza kwamafuta ndi gawo lomwe limasintha chizindikiro cha kutentha kukhala chizindikiro chamagetsi, ndipo mfundo yake yogwirira ntchito imachokera makamaka pamikhalidwe yakusintha kwachitsulo ndi kutentha. Makamaka, matenthedwe resistors amapezerapo mwayi pa chitsulo ichi kuyeza kutentha.
Poyang'anira mafakitale, mitundu yomwe imagwiritsidwa ntchito kwambiri yokana kutentha imaphatikizapo platinamu, mkuwa ndi faifi tambala. Pakati pawo, kukana kwa platinamu ndikofala kwambiri. Kukaniza kwamafuta kumakhala ndi mawonekedwe a kutentha kwabwino, magwiridwe antchito okhazikika komanso kulondola kwambiri pankhani ya kutentha kwabwinobwino. Choncho, m'malo ogwiritsira ntchito kutentha kwapakati, osagwedezeka komanso zofunikira zolondola kwambiri, kugwiritsa ntchito kukana kwa platinamu nthawi zambiri kumakondedwa.
3. Thermistor
Thermistor ndi gawo lomwe limasintha chizindikiro cha kutentha kukhala chizindikiro chamagetsi, ndipo mfundo yake yogwirira ntchito imadalira makamaka kukana kwa semiconductor kusinthasintha ndi kutentha. Makamaka, ma thermitors amapezerapo mwayi pazigawo za semiconductors kuyeza kutentha. Poyerekeza ndi kukana kwa kutentha, kukana kwa thermistor kumasintha kwambiri ndi kusintha kwa kutentha, kotero kutentha kwake kumakhala kocheperako (-50 ~ 350 ℃).
Ma thermistors amagawidwa mu NTC thermistors ndi PTC thermistors. Ma thermitors a NTC ali ndi coefficient yoyipa ya kutentha, ndipo kukana kwawo kumachepa kutentha kumawonjezeka. PTC thermistor ili ndi kutentha kwabwino, ndipo mtengo wake wokana udzawonjezeka ndi kuwonjezeka kwa kutentha. Chifukwa cha mawonekedwe ake apadera a kutentha kwa kutentha, thermistor ili ndi ntchito zosiyanasiyana pakuwona kutentha, kudziwongolera, zipangizo zamagetsi ndi zina.
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