基于TEC的低成本医用恒温器的设计与实现

Design and implementation of a low-cost medical thermostat based on TEC

在医药行业,药品配送和标本检验都离不开冷藏箱的使用。该研究基于热电制冷器(thermoelectric cooler, TEC)设计并实现了一种医用恒温器,具有便携、低成本,以及加热和制冷调节的优点。恒温器采用Arduino Nano模块作主控单元,利用低功耗蓝牙实现与移动设备的互连,且开发了一款微信小程序用于远程温度监测和调节。测试结果表明,该医用恒温器温度调节范围可覆盖0~40℃。在环境温度为20~25℃时,一块额定容量为8 000 mAh的锂电池可以让恒温器内容物维持在2℃长达7个小时。在制热模式下消耗的功率不到制冷模式下的一半,且制热系数的最大值比制冷系数的最大值高0.23。研究表明该恒温器的物料成本低于231元,完全能够满足在城市内运送药品或者医用标本的需求。

In the pharmaceutical industry, drug delivery and specimen inspection are inseparable from refrigerator. In this study, a medical thermostat was designed and realized based on the TEC, with advantages of portability, low cost, heating and cooling control. An Arduino Nano module was employed as the control unit, and a low power bluetooth was used for wireless connection with mobile terminators. Besides, a WeChat miniprogram was designed and realized for remote temperature monitoring and control. A test platform was built for testing the performance of thermostat. Test results show that the thermostat could control the temperature between 0 ℃ and 40 ℃. Long-term investigation shows that this thermostat can cool the material inside the medical tube at 2 ℃ for up to 7 hours with a lithium battery with a rated capacity of 8000 mAh when the ambient temperature is set between 20~25 ℃. Test results of power consumption show that the power thermostat consumes in heating mode is less than the half power consumption of thermostat in cooling mode. The maximum COP of heating mode is 0.23 more than that of cooling mode. The material cost of the thermostat is less than ￥231. The thermostat can support the drug or medical sample transportation between the medical facilities within the metropolitan area.