毕业设计（论文）_红外自动干手器设计与制作.doc

郑州轻院轻工职业学院 专科毕业设计（论文） 题 目 _红外自动干手器设计与制作 学生姓名 专业班级 学 号 系 别 机 电 工 程 系 指导教师(职称) 完成时间 20 年 月 日 红外自动干手器设计与制作 摘 要 自动干手机是一种高档卫生洁具，广泛应用于宾馆酒店、机场车站、体育场馆等公共场所的洗手间。其工作原理是采用一种红外线控制的电子开关，当有人手伸过来时，红外线开关将电热吹风机自动打开，人离开时又自动将吹风机关闭。 自动干手电路是由红外线发射电路，红外线接收电路，时间延迟电路，吹风机开关电路和电源电路五部分构成的。 在红外线发射电路中，输出电路端Q产生脉冲信号来控制红外线发光二极管发射光脉冲，二极管D1起保护红外发光二极管的作用。 在时间延迟和吹风机开关电路中，当输出端Q输出低电平时，三极管截止，无电流通过。继电器与三极管集电极相连，当有电流驱动时，开关吸合，电磁阀通电，电路闭合，吹风机吹出热风；当无电流驱动时，开关断开，电磁阀不通电，电路断开，吹风机不吹出热风。同时在继电器两端并联一个二极管实现保护，在电路中加入发光二极管D3作为显示电路，显示吹风机是否启动。 关键词：红外线发射器 红外接收放大器 时间延迟电路 电源电路 THE DESIGN OF INFRARED AUTOMATIC HAND DRYER ABSTRACT Automatic hand dryer is a high-grade sanitary ware, which is widely used in the toilets of hotels, airports and railway stations, sports stadiums and other public places. The principle is by using an infrared-control electronic switch, when someone stretches out hands, infrared switch automatically makes the electric hair dryer work, and will automatically turn off when people leaves. The automatic hand dryer is consist of five parts, including the infrared transmitter circuit, infrared receiver circuit, time delay circuit, hair dryer switch circuit and power supply circuit.  In infrared transmitter circuit, output side Q to produce the pulse signal to control the emitted light pulses of infrared light-emitting diodes, the effect of the D1 is to protect the infrared light-emitting diodes. In the time delay and a hairdryer switch circuit, when the output side Q is low, the transistor cuts off, no current passes through. When the relay and transistor collector is connected, current drives and the switch pulls the solenoid valve on power, the circuit is closed, then the hair dryer blows hot air; when the current drives, switch will be off, the solenoid valve is not energized, circuit is disconnect, hair dryer does not blow hot a