《无线多功能天然气煤气及缺氧报警自动关闭器设计》.doc

PAGE  PAGE 12 无线多功能天然气煤气及缺氧报警自动关闭器 【摘 要】本系统是用于防止煤气中毒，缺氧装置。分为无线收发的检测部分和控制部分。检测部分置于易发生煤气泄漏及缺氧环境处，控制部分置于煤气开关控制处。当检测部分检测到空气中煤气或烟雾含量超标或氧气含量过低时，控制部分可以关闭煤气开关并启动氧气释放器。本系统结合煤气传感器、CO传感器、氧气传感器为检测部分核心，以PT2262/2272编码解码芯片，辅以相应的外围发射接收模块，作为报警信息通信。再通过接收到信号的状态控制触发报警电路以及煤气开关控制电路、氧气释放电路。该装置功耗低，体积小，成本低，检测灵敏度可调，系统稳定、安全。 【关键词】传感器 煤气 缺氧 报警 开关控制 Wireless Multifunctional Auto-shut Device for Gas and Hypoxia Alarming [Abstract]: This system is used to prevent gas poisoning, hypoxia. It’s divided into the wireless transceiver detection part and the control unit .The detection part is placed in the environment where gas leak and hypoxic are easily happen, the control unit is placed at the gas switch. When the detector detects smoke or gas in the air overweight or low oxygen content, the control part will shut off the switch and activate the oxygen release device. This system combines gas sensors, CO sensor, oxygen sensor for the detection part of the core.PT2262/2272 codec chips, supported by the corresponding external transmitting and receiving modules, used for the communication of alarming information. To receive the signal through state control of gas and triggered alarm circuit switching control circuit, oxygen release circuit. The device is of low power consumption, small size, low cost, sensitivity adjustable, stabile, and safe. [Key Words] Sensor, Gas, Hypoxic, Alarm , Switch control 目录 无线多功能煤气及缺氧报警自动关闭器………………………………………… 1 1. 系统设计…………………………………………………………………………3 1.1 设计目的………………………………………………………….……………..3 1.2 方案简介…………………………………………………….…………………..3 2. 主要部分的工作原理分析…………………………………………………….…3 2.1 系统简介（框图）………………………………………………………………3 2.2 检测部分………………………………………………………………………4 2.2.1传感器检测模块………………………………………………………………..4 2.2.2电压比较器……………………………………….…………………………….5 2.2.3通信模块（发送端）…………………………….…………………………….5 2.3 控制部分…………………………………………………………………………6 2.3.1.1通信模块（接收端）…………………………………………………………6 2.3.1.2 PT2262/2272的编码………………………………………………………..7 2.3.2以CD4025为核心的判断模块………………………………………………...8 2.3.3煤气天然气电磁阀及氧气袋控制开关………………………………………..9 2.3.4