Ventilation type wet and dry bulb temperature measuring device

Abstract

The invention relates to a ventilation type wet and dry bulb temperature measuring device, which comprises a standard air duct, wherein the front end of the standard air duct is provided with a standard flow pipe; a rectification gate is arranged in the standard air duct and at the joint of the standard flow pipe and the standard air flue; a dry bulb thermometer and a wet bulb thermometer are respectively fixed on the outer side of the standard air flue; a temperature bulb of the wet bulb thermometer is coated with a water infiltrated fabric, and the lower end of the fabric is soaked into a water container containing water; the rear end of the standard air flue is connected with a centrifugal fan; the centrifugal fan is connected with a frequency converter; and the frequency converter is connected with a wind speed sensor through a PID (Proportion Integration Differentiation) controller. The Ventilation type wet and dry bulb temperature measuring device disclosed by the invention has the beneficial effect that the device is applicable to the measurement of air dry wet bulb temperatures, and has the advantages of direct indication, convenience in operate, high precision, strong stability, adjustable wind speed and the like.

Description

technical field [0001] The invention relates to an air temperature and humidity testing device, in particular to a ventilated wet and dry bulb temperature testing device. Background technique [0002] Humidity is a physical quantity that expresses the degree of dryness and humidity of the air, and is a scale that expresses the amount of water vapor in the air. If the air humidity in the production and living environment is too high or too low, it will make people feel uncomfortable, which will affect their health, and even affect the normal progress of industrial production and the storage of cultural relics and food. In order to control the humidity of the air well to meet the requirements of production and life, the humidity of the air should be measured, and the air in the room should be effectively controlled through the air conditioning device. However, because the air humidity is too much affected by the external conditions , which brings many difficulties to the prec...

AI Technical Summary

Problems solved by technology

Among the many state parameters of the air, pressure and temperature are easy to measure, moisture content and density are not easy to measure directly, and relative humidity can be measured, but the general method is not accurate enough. Therefore, in order to accurately obtain the air humidity value (usually refers to relative humidity), The use of wet and dry bulb thermometers to measure the state of the air has become the main means commonly used.

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