Rotary valve for gas sampling

Abstract

The invention provides a rotary valve for gas sampling. The rotary valve comprises a valve body, a motor, a motor support frame and a main body frame with a gas passage. One end of the valve body is communicated with the motor, and the other end of the valve body extends into the main body frame and is matched with a through hole formed in the main body frame; and the motor is detachably connectedto the motor support frame, and the motor support frame is fixedly connected with the main body frame. The valve body comprises a first steering valve, a through hole penetrating the first steering valve is formed in the first steering valve, the diameter of the through hole is matched with the diameter of the gas passage, and a waste gas guide-out surface is arranged on the first steering valveand is not intersected with any point on the through hole of the first steering valve. According to the rotary valve for gas sampling, the rotation angle of the first steering valve is driven by the motor, so that the collected gas is controlled to enter a waste gas pipeline or a collecting pipeline, and compared with an existing solenoid valve control, the rotary valve for gas sampling has the beneficial effects of light weight and sufficient miniaturization and modularization and is suitable for being widely popularized in the technical field of gas sampling.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a rotary valve for gas sampling. Background technique [0002] Gas sampling technology collects gas through a gas sampling device. After collecting the gas into a fixed vessel, the components and unknowns in the gas are determined through detection instruments. The reasonable collection of samples is very important for the whole inspection process, which directly affects the accuracy of the final analysis results. [0003] Whether it is the collection of industrial gas samples such as chemical waste gas or the collection of human breathing gas, because in some experiments, the gas samples are not all collected, there may be some waste gases that are irrelevant to the detection, which need to be excluded Take the exhaled breath of human beings as an example. As a way to reflect the health status of the human body, the breathed air of the human body can reflect some importan...

AI Technical Summary

Problems solved by technology

[0004] There are more or less certain defects in the collection devices of the prior art. For example, CN205228882U "A kind of end-expiration sampling device" ensures the quantitative collection of the collected gas through the cooperation of the two-way valve one and the two-way valve two. Announcement No. CN110226931A "A Breath Analysis Device and Its Application Method" adopts multiple valve control including "three-way valve", "first valve" and "second valve". It is also heavy, inconvenient to carry, not lightweight enough and miniaturized. At the same time, the large number of valves also means that there are more gas residues in the subject in the valve body, which will also lead to inaccurate data collection for the next subject.

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