{"id":676612,"date":"2024-11-29T00:48:18","date_gmt":"2024-11-28T23:48:18","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=676612"},"modified":"2024-11-29T00:48:18","modified_gmt":"2024-11-28T23:48:18","slug":"cach-ro-le-nhiet-ngan-dong-co-qua-nhiet","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/cach-ro-le-nhiet-ngan-dong-co-qua-nhiet\/","title":{"rendered":"C\u00e1ch r\u01a1-le nhi\u1ec7t ng\u0103n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">R\u01a1-le nhi\u1ec7t ng\u0103n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t b\u1eb1ng c\u00e1ch ng\u1eaft \u0111i\u1ec7n khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n an to\u00e0n, b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/cach_ro-le_nhiet_ngan_dong_co_qua_nhiet.png\" alt=\"C\u00e1ch r\u01a1-le nhi\u1ec7t ng\u0103n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>C\u00e1ch r\u01a1-le nhi\u1ec7t ng\u0103n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t (thermal engineering), m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng gi\u00fap b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 kh\u1ecfi qu\u00e1 nhi\u1ec7t l\u00e0 r\u01a1-le nhi\u1ec7t. R\u01a1-le nhi\u1ec7t l\u00e0 m\u1ed9t lo\u1ea1i c\u00f4ng t\u1eafc t\u1ef1 \u0111\u1ed9ng, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ng\u1eaft k\u1ebft n\u1ed1i d\u00f2ng \u0111i\u1ec7n khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 m\u1ee9c an to\u00e0n. D\u01b0\u1edbi \u0111\u00e2y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u chi ti\u1ebft v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a r\u01a1-le nhi\u1ec7t v\u00e0 vai tr\u00f2 c\u1ee7a n\u00f3 trong vi\u1ec7c ng\u0103n ch\u1eb7n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t.<\/p>\n<h2>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a r\u01a1-le nhi\u1ec7t<\/h2>\n<p>R\u01a1-le nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean nguy\u00ean l\u00fd gi\u1ea3n n\u1edf nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u. B\u00ean trong r\u01a1-le nhi\u1ec7t th\u01b0\u1eddng c\u00f3 m\u1ed9t t\u1ea5m kim lo\u1ea1i g\u1ed3m hai ho\u1eb7c nhi\u1ec1u l\u1edbp kim lo\u1ea1i kh\u00e1c nhau g\u1ecdi l\u00e0 &#8220;bi-metal&#8221;. C\u00e1c l\u1edbp kim lo\u1ea1i n\u00e0y c\u00f3 h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t kh\u00e1c nhau, ngh\u0129a l\u00e0 khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, ch\u00fang s\u1ebd gi\u00e3n n\u1edf v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00e1c nhau.<\/p>\n<p>V\u00ed d\u1ee5, khi \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng, nhi\u1ec7t l\u01b0\u1ee3ng sinh ra s\u1ebd \u0111\u01b0\u1ee3c truy\u1ec1n t\u1edbi r\u01a1-le nhi\u1ec7t. N\u1ebfu nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u0111\u1ed9ng c\u01a1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng an to\u00e0n, t\u1ea5m bi-metal b\u00ean trong r\u01a1-le s\u1ebd u\u1ed1n cong do s\u1ef1 gi\u00e3n n\u1edf kh\u00f4ng \u0111\u1ec1u c\u1ee7a c\u00e1c l\u1edbp kim lo\u1ea1i. Khi t\u1ea5m bi-metal u\u1ed1n cong \u0111\u1ebfn m\u1ed9t m\u1ee9c \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh, n\u00f3 s\u1ebd k\u00edch ho\u1ea1t c\u00f4ng t\u1eafc v\u00e0 ng\u1eaft k\u1ebft n\u1ed1i d\u00f2ng \u0111i\u1ec7n, t\u1eeb \u0111\u00f3 ng\u1eebng cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho \u0111\u1ed9ng c\u01a1.<\/p>\n<h2><u>L\u1ee3i \u00edch c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng r\u01a1-le nhi\u1ec7t<\/u><\/h2>\n<ul>\n<li>B\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 kh\u1ecfi h\u1ecfng h\u00f3c do qu\u00e1 nhi\u1ec7t.<\/li>\n<li>Gi\u1ea3m thi\u1ec3u nguy c\u01a1 ch\u00e1y n\u1ed5 v\u00e0 tai n\u1ea1n c\u00f4ng nghi\u1ec7p.<\/li>\n<li>N\u00e2ng cao tu\u1ed5i th\u1ecd v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n.<\/li>\n<li>Ti\u1ebft ki\u1ec7m chi ph\u00ed b\u1ea3o tr\u00ec v\u00e0 s\u1eeda ch\u1eefa \u0111\u1ed9ng c\u01a1.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i r\u01a1-le nhi\u1ec7t<\/h2>\n<p>C\u00f3 nhi\u1ec1u lo\u1ea1i r\u01a1-le nhi\u1ec7t kh\u00e1c nhau, m\u1ed7i lo\u1ea1i c\u00f3 \u01b0u \u0111i\u1ec3m v\u00e0 \u1ee9ng d\u1ee5ng ri\u00eang:<\/p>\n<ol>\n<li><b>R\u01a1-le nhi\u1ec7t ki\u1ec3u b\u00edm:<\/b> S\u1eed d\u1ee5ng t\u1ea5m bi-metal \u0111\u1ec3 ng\u1eaft k\u1ebft n\u1ed1i d\u00f2ng \u0111i\u1ec7n khi qu\u00e1 nhi\u1ec7t. Lo\u1ea1i n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb gia d\u1ee5ng v\u00e0 c\u00f4ng nghi\u1ec7p nh\u1eb9.<\/li>\n<li><b>R\u01a1-le nhi\u1ec7t ki\u1ec3u nhi\u1ec7t \u0111i\u1ec7n:<\/b> S\u1eed d\u1ee5ng m\u1ed9t h\u1ee3p ch\u1ea5t \u0111\u1eb7c bi\u1ec7t c\u00f3 t\u00ednh ch\u1ea5t \u0111i\u1ec7n nhi\u1ec7t, khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, h\u1ee3p ch\u1ea5t n\u00e0y s\u1ebd t\u1ea1o ra \u0111i\u1ec7n \u00e1p \u0111\u1ec3 k\u00edch ho\u1ea1t c\u00f4ng t\u1eafc. Lo\u1ea1i n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 y\u00eau c\u1ea7u \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/li>\n<li><b>R\u01a1-le nhi\u1ec7t ki\u1ec3u ch\u1ea5t l\u1ecfng:<\/b> S\u1eed d\u1ee5ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong m\u1ed9t \u1ed1ng kim lo\u1ea1i. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng, ch\u1ea5t l\u1ecfng gi\u00e3n n\u1edf v\u00e0 t\u1ea1o \u00e1p su\u1ea5t \u0111\u1ec3 k\u00edch ho\u1ea1t c\u00f4ng t\u1eafc. Lo\u1ea1i n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng HVAC (Heating, Ventilation, and Air Conditioning).<\/li>\n<\/ol>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>R\u01a1-le nhi\u1ec7t l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n kh\u1ecfi nguy c\u01a1 qu\u00e1 nhi\u1ec7t. Nh\u1edd v\u00e0o nguy\u00ean l\u00fd gi\u1ea3n n\u1edf nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u bi-metal, r\u01a1-le nhi\u1ec7t c\u00f3 th\u1ec3 ng\u1eaft k\u1ebft n\u1ed1i d\u00f2ng \u0111i\u1ec7n m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 m\u1ee9c an to\u00e0n. Vi\u1ec7c s\u1eed d\u1ee5ng r\u01a1-le nhi\u1ec7t kh\u00f4ng ch\u1ec9 gi\u00fap t\u0103ng \u0111\u1ed9 b\u1ec1n v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a thi\u1ebft b\u1ecb m\u00e0 c\u00f2n \u0111\u1ea3m b\u1ea3o an to\u00e0n cho ng\u01b0\u1eddi s\u1eed d\u1ee5ng v\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R\u01a1-le nhi\u1ec7t ng\u0103n \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t b\u1eb1ng c\u00e1ch ng\u1eaft \u0111i\u1ec7n khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n an to\u00e0n, b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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