毕业设计（论文）-超细水雾手提灭火器的研制.doc

超细水雾手提灭火器的研制

摘要
细水雾灭火技术以其环保性好、灭火迅速、耗水量低、破坏性小以及适用面宽等特点,已成为国际消防领域关注研究的热点之一。将细水雾应用在移动灭火器上具有重大的社会和经济效益。
本文以水为灭火介质,利用气体挤压和液体雾化技术,研制超细水雾手提灭火器。本文分析了气泡雾化的可行性和产生方法,进行了灭火器的总体设计,设计选择了气瓶和压力水罐等辅助系统,设计了气液双路扳机阀,设计了一种气泡雾化喷嘴,最后再试验的基础上做出了一套产品样机。本文重点对气泡雾化技术进行了设计研究,首先,在总结前人理论研究的基础上从两相流理论出发确定了气泡雾化喷嘴的如下重要参数:喷嘴喉部尺寸、喷嘴气孔数、气孔直径、进水孔数目、进水孔直径。在理论上论证了气泡雾化喷嘴雾化的可能性,并且设计了一系列的不同几何参数的喷嘴零件。其次,对设计加工的试件,采用不同方案的试验。验证理论设计的可靠性,通过实验确定了喷嘴喉部尺寸、喷嘴气孔数、气孔直径、气孔分布、水孔数目、水孔直径,使得喷嘴能够满足灭火器的总体要求。
关键词:细水雾,喷嘴,两相流,灭火器,阀门
Design on Back-Pack Fire Extinguishing Unit of Water Mist

Abstract
The advantages of water mist suppression technology, including environment benefit, fast extinguishment, low water consumption and wide practicability, have received considerable attention in international fire science research field. A studying and designing on pack-back fire extinguishing unit of water mist was conducted. Above all, as the paper calculated the system, we choose the gas bottle and water tank which can working in condition of high pressure. Then, we designed a two-path deadline valve. In order to develop a new technique path for new method of producing water mist, we designed an effervescent atomizer based on fluid mechanics of effervescent atomization. At the last we designed a product of fire extinguishing unit. Effervescent atomization is a new method of producing water mist with two-phase fluid. This design includes two parts:
Firstly, based on the review of study done before and the theory of two-phase flow, some important parameters of the effervescent atomizer, including the throat diameter, the number of gas holes and the diameters and distributions, the number of water holes and diameters , were determined. The feasibility of the effervescent atomizer was proved theoretically, and a series of atomizer parts, with different geometrical parameters, were designed and made.
Secondly, tests were carried out with those test units for different scheme. These tests were to verify the reliability of the t