A standard ventilated psychrometer

Abstract

The invention discloses a standard ventilation psychrometer. The standard ventilation psychrometer is characterized in that a dry bulb thermometer and a wet bulb thermometer are mounted on a ventilation structural body respectively through a dry bulb insulation mounting sleeve and a wet bulb insulation mounting sleeve, a dry bulb anti-radiation sleeve and a wet bulb anti-radiation sleeve respectively cover the dry bulb thermometer and the wet bulb thermometer, and the dry bulb anti-radiation sleeve and the wet bulb anti-radiation sleeve are connected with the ventilation structural body respectively through a dry bulb insulation connecting pipe and a wet bulb insulation connecting pipe; a water-supply cooling device comprises a stainless steel bushing, a first water-feeding sleeve, a second water-feeding sleeve, a third water-feeding sleeve, an insulator and a water storage container, wherein the first water-feeding sleeve is arranged on the outer wall of the stainless steel bushing, the second water-feeding sleeve clings to the inner wall of the stainless steel bushing through the insulator, the third water-feeding sleeve is arranged on the outer wall of the wet bulb anti-radiation sleeve, is immersed into the water storage container through water diversion lines of the three water-feeding sleeves and is integrated with a wet bulb water-feeding sleeve on the wet bulb thermometer through an extending segment introduced by the second water-feeding sleeve so that water is fed into the wet bulb water-feeding sleeve through the second water-feeding sleeve. The standard ventilation psychrometer reaches a level that the measuring error is less than + / -1% RH.

Description

technical field [0001] The invention relates to a standard ventilating psychrometer, in particular to a standard ventilating psychrometer adopting the dry-wet bulb method. Background technique [0002] The dry wet bulb method plays an important role in the humidity measurement method, and the standard ventilated psychrometer of the dry wet bulb method has long been used as the standard for verifying other hygrometers. The current standard ventilation psychrometer is divided into first-class standard and second-class standard. The first-class standard has a large size and is a large-scale equipment. It is mainly used under laboratory conditions for the measurement of humidity value transfer, and is not suitable for humidity measurement in general work. Compared with the first-class standard ventilated psychrometer, the second-class standard ventilated psychrometer has smaller dimensions, which can be used not only for the measurement of humidity value transfer, but also for ...

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Problems solved by technology

This is reflected in: the current standard ventilated psychrometer, the wet bulb radiation shield adopts a double-layer structure and the inner and outer surfaces are polished. Although this method can effectively reduce the impact of external radiation on the direct radiation of the wet bulb thermometer, the temperature of the radiation shield is always If it is higher than the wet bulb temperature, it will generate radiation heat transfer to the wet bulb thermometer, resulting in inaccurate measurement of the wet bulb temperature; the current standard ventilated psychrometer, the water temperature for the water jacket on the wet bulb is basically the same as the temperature of the measured air, that is higher than the wet bulb temperature, which introduces an error in the measurement of the wet bulb temperature

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