Chinangwa cheDewar vacuum uye kutsiva nenitrogen

TheDewar flaskinotsiviwa nenitrogen panguva yekutsvaira, iyo inotarirwa nemaitiro enitrogen. Kuenzaniswa nemhepo yakajairika, high-purity nitrogen haina oxygen-isina, inenge isina mwando, uye isina mafuta. Iyo ine yakaderera thermal yekuwedzera coefficient, yakaderera thermal conductivity, inononoka kupisa, uye yakaderera kupisa kuunganidza kumhanya, saka inogona kuvimbisa zvakanyanya kupisa kwekushisa kwekuita kweDewar bhodhoro.

1. Kupisa tangi yemukati kusvika ku 250 degrees kuti ivhare, kunyanya kubvumira mhepo mukati kuti iwedzere kupisa uye kuwedzera, kuitira kuti mhepo ibudiswe zvakanyanya sezvinobvira, uye chivharo chepamusoro chinogona kuumbwa mushure mekutonhora.

2. Kana zvichinzi vacuuming process uye welding process level yakanyanya kwazvo, inogona kuve nechokwadi kuti iyo vacuum haina kuparadzwa, uye zvakare inogoneka pasina nitrogen kuzadza, nekuti pasi pemamiriro ekumusoro vacuum, nekuda kwekuti kupisa kwekushisa svikiro idiki, kupisa kwekushisa kunokurumidza. Iko kufamba kunononoka zvakare, izvo zvinogona kuzadzisa kudiwa kwehukama insulation.3. Nitrogen kuzadzwa kunonyanya kushandiswa kubhadhara kana maitiro maviri ari pamusoro apa asina kukura. Chero bedzi imwe nzira inokundikana mumabhodhoro gumi, inofanira kuzadzwa nenitrogen. Mushure mekunge nitrogen yazadzwa, kudzvanywa mubhodhoro kuri pedyo nekumanikidzwa kwakajairika, saka kana iyo welding yemhando isiri yakanaka, mhepo haisi nyore kupinda mukati, uye iyo nitrogen yakazadzwa mubhodhoro inogona kuchengetwa pakutanga kwekushandiswa nekuda kwekuderera kwayo kwekuwedzera kwemafuta coefficient uye yakaderera thermal conductivity. Zvikuru adiabatic.

4. The welding process ndiyo yakakosha nyaya. Kana iyo welding mhando isina kunaka zvakakwana, iyoDewar flaskichakanganiswa nekuwedzera kwekupisa uye kuputika panguva yekushandiswa. Nitrogen inopfachukira muhumburumbira kana yapiswa, uye mweya unobuda mukati kana watonhodzwa. Mushure mekushandiswa kwenguva refu, iyo nitrogen inotsiviwa nemhepo, nokudaro ichiita silinda Kurasikirwa kwekushanda kwekushisa kwekushisa uye nyore kukonzera kukanganisa kwakadai sekuputika kwebhodhoro.