VOC (Volatile organic compound) release cabin with air inlet flow compensation control system and control method

Abstract

The invention discloses a VOC (volatile organic compound) release cabin with an air inlet flow compensation control system and a control method. The VOC release cabin comprises cabin body, a air inlet pipeline connected with the air inlet of the cabin body, and an air exhaust pipeline connected with the exhaust port of the cabin body, and also comprises the air inlet flow compensation control system for carrying out compensation control on air inlet flow, and a mass flow controller for controlling volume flow of dry air and a humidifier for humidifying dry air in the air inlet pipeline, which are sequentially connected with the air inlet pipeline, wherein the cabin body is provided with a temperature sensor for detecting the temperature inside the cabin body and a humidity sensor for detecting the humidity in the cabin body, the temperature sensor and the humidity sensor are connected with the signal input end of a controller, and the mass flow controller is connected with the signal input / output end of the controller. The VOC release cabin further comprises a pressure sensor for detecting atmospheric pressure, which is connected with the signal input end. The VOC release cabin can accurately control air volume flow actually required in the cabin body, and is high in measuring accuracy.

Description

technical field [0001] The invention relates to a volatile organic compound detection system, and more specifically relates to a VOC release cabin with an intake flow compensation control system and a control method. technical background [0002] The volatile organic compound detection system is used to detect the volatile organic compound (VOC, that is, the tested substance) contained in the product to detect whether the volatile organic content of the product meets the requirements of the relevant standards. The traditional VOC release cabin is in One standard atmospheric pressure, Under the condition of , set the required dry air volume flow Q in the cabin in the controller 0 , through the controller to control the volume of the VOC release chamber, but it does not take into account the different altitudes and atmospheric pressure, nor does it take into account the influence of the temperature and humidity in the VOC release chamber. Due to the different atmospheric pr...

AI Technical Summary

Problems solved by technology

[0002] The volatile organic compound detection system is used to detect the volatile organic compound (VOC, that is, the tested substance) contained in the product to detect whether the volatile organic content of the product meets the requirements of the relevant standards. The traditional VOC release cabin is in One standard atmospheric pressure, Under the condition of , set the required dry air volume flow Q in the cabin in the controller 0 , through the controller to control the volume of the VOC release chamber, but it does not take into account the different altitudes and atmospheric pressures, nor does it take into account the influence of the temperature and humidity in the VOC release chamber

Due to the different atmospheric pressure in various places and the temperature and vapor pressure changes in the VOC release cabin, the volume flow Q of dry air required in the cabin will be set in the controller. 0 Deviating from the actual required dry air volume flow Q in the cabin 1 , causing a deviation in the test accuracy of the VOC release chamber, the temperature in the chamber is generally The influence of the above is about 10%, and the error of air pressure is also large when the altitude is high

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