Ionization device of self-cleaning two-dimensional flow type structure used for gas detection

Abstract

The invention relates to the technical field of ionization chambers, specifically to an ionization device of a self-cleaning two-dimensional flow type structure used for gas detection. The ionization device is characterized in that the device includes an ionization chamber and an ultraviolet lamp which are connected, and an included angle between a propagation direction of ultraviolet light emitted by the ultraviolet lamp and a flow direction in the ionization chamber is 90 degrees. The ionization device provided by the invention has the characteristics that repeated use is convenient, and vapor influence is reduced.

Description

technical field [0001] The invention relates to the technical field of ionization chambers, in particular to a self-cleaning two-dimensional flow structure ionization device for gas detection. Background technique [0002] The ionization chamber is the core part of the gas detection PID. Looking at the entire development process of the PID, it is actually a process of continuous updating and optimization of the ionization chamber. The structure of the ionization chamber directly affects the external volume and detection efficiency of the PID. Therefore, it is necessary to adopt a design Reasonable ionization chamber structure. [0003] During the development of the PID ionization chamber, the structure of the ionization chamber is often called AxialFlow (axial flow) structure, such as figure 1 shown. The outer shape of the AxialFlow structure is cylindrical, the inside is the positive electrode, and the outside is the negative electrode. o Angle, but in the actual applica...

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Problems solved by technology

[0004] (1) Inconvenient for repeated use: Because the propagation direction of ultraviolet light is parallel to the flow direction of gas in the ionization chamber, the gas to be tested is easy to remain in the ionization chamber when it flows through the ionization chamber, and some pollutants are also lost during the flow of the gas to be measured. It is brought into the ionization chamber and accumulated on the surface of the lamp. Therefore, after using the PID to detect the gas to be tested, the remaining gas to be tested and residual substances must be thoroughly removed before it can be used for secondary use. The PID with this structure is in the Frequent and repeated cleaning work during use is inevitable

[0005] (2) Water vapor has a great influence: PID will have a certain amount of water vapor in various operating environments, and in the process of ultraviolet lamp irradiation, water vapor will absorb part of the ultraviolet light, just like driving in a foggy day. Moisture in the air absorbs the same light as the headlights of a car, making it impossible for the driver to see distant objects in the illuminated area even when the headlights are turned on

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