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Maanshan constant temperature and humidity test box operation system_Hefei Boyi Instrument Equipment Co., Ltd.

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Operation system of Maanshan constant temperature and humidity test box

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Operation system of Maanshan constant temperature and humidity test box


是指能同时施加温度、湿度应力的试验箱。 Constant temperature and humidity test box refers to a test box that can simultaneously apply temperature and humidity stress. With the development of China's industrial products, in recent years, China has introduced a large number of test systems from abroad, which has played an important role in the development and shaping of China's industrial products. However, due to its own complexity, the test box appeared in operation. Many problems have arisen, and problems cannot be solved in time, which greatly prolongs the test cycle and affects the product development. The reason for these phenomena is that they do not understand the working principle of the comprehensive test.
恒温恒湿试验箱 由制冷系统,加热系统,控制系统,温度系统空气循环系统,和传感器系统等组成,上述系统分属电气和机械制冷两大方面。 Working principle: The constant temperature and humidity test chamber is composed of a refrigeration system, a heating system, a control system, a temperature system air circulation system, and a sensor system. The above systems belong to two major aspects of electrical and mechanical refrigeration. The following is a preliminary description of the working principle and working process of several major systems.
1. Refrigeration system: The refrigeration system is one of the key parts of the comprehensive test chamber. Generally speaking, the refrigeration methods of the test box are mechanical refrigeration and auxiliary liquid nitrogen refrigeration. Mechanical refrigeration uses vapor compression refrigeration. They are mainly composed of compressors, condensers, throttling mechanisms and evaporators. To reach -55 ° C, single-stage refrigeration is difficult to meet the requirements, so the refrigeration method of the test box generally uses cascade refrigeration. 恒温恒湿试验箱 的制冷系统由两部分组成,分别称为高温部分和低温部分,每一部分是一个相对独立的制冷系统。 The refrigeration system of the constant temperature and humidity test chamber produced by our company (Shanghai Shangqun Electronic Technology Co., Ltd.) consists of two parts, which are called high temperature part and low temperature part, and each part is a relatively independent refrigeration system. The evaporation of the refrigerant in the high temperature part absorbs the heat from the refrigerant in the low temperature part and vaporizes; the evaporation of the refrigerant in the low temperature part absorbs heat from the object to be cooled (air in the test chamber) to obtain the cooling capacity. An evaporative condenser is used between the high temperature part and the low temperature part. It is both a condenser in the high temperature part and a condenser in the low temperature part. The high temperature part of the refrigerant in the STH series test box uses medium temperature refrigerant, and the low temperature part of the refrigerant uses low temperature refrigerant. The temperature inside the box can reach -70-150 ℃.
2. Heating system: Compared with the refrigeration system, the heating system of the test chamber is relatively simple. It is mainly composed of high-power resistance wires. Because the heating rate required by the test box is large, the power of the heating system of the test box is relatively large, and a heater is also provided on the bottom plate of the test box.
3. Control system: The control system is the core of the comprehensive test box, which determines the important indexes such as the heating rate and accuracy of the test box. At present, most of the controllers of the test box use PID control, and a small number of them use a combination of PID and fuzzy control. Because the control system basically belongs to the category of software, and in the process of using this part, generally no problems occur.
4. Temperature system: The temperature system is divided into two subsystems: humidification and dehumidification.
The humidification method of the test box generally adopts the steam humidification method, that is, the low-pressure steam is directly injected into the test space for humidification. This humidification method has a high humidification capacity, fast speed, and sensitive humidification control, and it is easy to achieve forced humidification especially when the temperature is lowered.
   的除湿方式有两种:机械制冷除湿和干燥除湿。 There are two types of dehumidification in the constant temperature and humidity test box: mechanical refrigeration and dehumidification. The dehumidification principle of mechanical refrigeration and dehumidification is to cool the air to below the dew point temperature, so that the water vapor greater than the saturated moisture content condenses and precipitates, which reduces the humidity. Dryer dehumidification is to use air pump to extract the air in the test chamber, inject the dry air, and send the humid air to the recyclable dryer for drying. After drying, it is sent to the test chamber again. . 0℃一下。 Now most of the integrated test chambers use the former dehumidification method and the latter dehumidification method, which can make the dew point temperature reach 0 ° C. Suitable for occasions with special requirements, but the cost is more expensive.
恒温恒湿试验箱 的传感器主要是温度和湿度传感器。 5. Sensor system: The sensors in the constant temperature and humidity test box are mainly temperature and humidity sensors. Temperature sensors are more commonly used in platinum groups and thermocouples. There are two methods for measuring humidity: dry-wet bulb thermometer method and solid-state electronic sensor direct measurement method. Due to the low accuracy of the dry-wet bulb method, current test chambers are gradually replacing solid-state sensors with dry-wet bulbs to measure humidity.
6. Air circulation system: The air circulation system generally consists of a centrifugal fan and a motor that drives it. It provides air circulation in the test chamber.

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