Views: 6 Author: Site Editor Publish Time: 2023-08-07 Origin: Site
From a large industrial country to a strong industrial country, in recent years, with the rapid development of the manufacturing industry, the environmental testing industry also plays an extremely important role in which the temperature humidity chamber is an indispensable piece of testing equipment for manufacturers to confirm the reliability of their products. The temperature humidity chamber is widely used in aerospace, metal, electrical, electronic, plastic, rubber, and other industries to test the quality of products in high temperature, low temperature, or hot and humid environments, and can be used as a basis or reference for product improvement. In the process of using the equipment, the operator's good use of skills and maintenance methods can effectively extend the service life of the temperature and humidity test chamber. To this end, we will explain the basic working principle of this test chamber.
Here is the content list:
Refrigeration system
Heating system
Control system
Humidity system
The temperature humidity chamber refrigeration method is mechanical refrigeration and auxiliary liquid nitrogen refrigeration, mechanical refrigeration using vapor compression refrigeration, the refrigeration method is widely used in artificial refrigeration and is one of the economic refrigeration methods. There are single-stage refrigeration, multi-stage refrigeration, and stacked refrigeration types. They mainly consist of a compressor, condenser, throttling mechanism, and evaporator. As we test the low temperature to reach -55°C, single-stage refrigeration is difficult to meet the requirements, so the general use of stacked refrigeration. It consists of two parts, called the high-temperature part and the low-temperature part, each part is a relatively independent refrigeration system.
The heating system of the temperature humidity chamber is relatively simple compared to the refrigeration system. It consists mainly of a high-power resistance wire. Due to the large heating rate required by the chamber, the heating system of the chamber is relatively large in power, and there is also a heater in the bottom plate of the chamber.
The control part is the core of the temperature humidity chamber, it determines the rate of temperature rise and fall of the test chamber, accuracy, and other important indicators. Most of the existing test chamber controllers use PID control, there are also a small number of PID and fuzzy control combinations of control methods.
The humidity system is divided into humidification and dehumidification two sub-systems. temperature humidity chamber humidification method generally uses steam humidification method, that is, low-pressure steam directly into the test space humidification. This humidification method has a strong humidification capacity, fast speed, and sensitive humidification control, especially when cooling down the temperature is easy to achieve forced humidification. Temperature and humidity cycle test chamber dehumidification there are two ways, respectively, mechanical refrigeration dehumidification and desiccant dehumidification. The mechanical refrigeration dehumidification principle is to cool the air to below the dew point temperature, so that greater than the saturation moisture content of water condensation precipitation, so as to reduce the humidity.
The above is the principle of operation of the temperature humidity chamber. In this article only a brief introduction has been made, if you want to know more comprehensive content, you can contact us for more details.
