A railway monitoring system firstly includes an optical fiber. A first part of the fiber is attachable to one of a pair of tracks of a rail, and a characteristic of the first part of the fiber is variable in correspondence to variance of a characteristic of said one track where the first part of fib.....
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一种有个人通风装置的室内通风系统，由先有技术的通风装置和装在椅子上的个人通风装置组成。所述装在椅子上的个人通风装置，由和供气总管道相连接的可以兼作椅脚和扶手支撑的直管道、可以兼作扶手的横管道、位于横管道上的空气流量调节装置、可自由弯曲的软管和位于该软管顶端的风嘴组成。室外输入的空气用先有技术进行过滤、除臭、加热或冷却、消毒、优化、泵送到地面的供气总管道后，由直管道通向横管道，再经过横管道上的空气流量调节装置调节成所需的风量进入软管，最后由软管末端的风嘴喷向使用者的呼吸部位。本发明消除了先有技术中出风口离呼吸部位太远的缺点，从而减少环境空气中的污染物混入吸气的份量，减少整个通风系统的能耗，又减少.....
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One kinds of shape memory alloys are driven by the non-wheel motor mechanism, comprising: a main body frame, which forms a receiving space; turning portion, provided on one side of the body frame can be rotated relative to the main frame and including a ratchet (3 ); and a mobile portion, provided o.....
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本发明涉及一种煤粉喷嘴装置，连接煤粉混合气体输入装置和炉膛，包括主体，主体内设有一次风喷嘴、二次风喷嘴、三次风喷嘴和中央混合气室，一次风喷嘴、二次风喷嘴和三次风喷嘴并行设置；一次风喷嘴与中央混合气室连通，以煤粉、空气和煤粉燃烧产生的烟气为主要成分的主气流从一次风喷嘴和中央混合气室进入炉膛；二次风喷嘴与一次风喷嘴连通，以空气或/和助燃剂为主要成分的二次气流从二次风喷嘴和一次风喷嘴的主气流会合再经过中央混合气室进入炉膛；以空气和煤粉燃烧产生的烟气为主要成分的三次气流从三次风喷嘴进入炉膛；本发明的煤粉喷嘴装置通过调整主气流、二次气流和三次气流的大小和成分比例来调整火焰大小，并使煤粉达到最高燃烧率。
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The invention discloses a gas burner for controlling mixing, comprising a burner body. The rear end surface of the burner body is provided with a mixed gas nozzle and a secondary air nozzle, and a gas channel and a primary air channel which are both communicated with the mixed gas nozzle are arrange.....
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