Air ion detection apparatus

Abstract

The invention discloses an air ion detection apparatus, comprising a cylindrical collection pipe (1), an amplifier box (2) accommodating an amplifier (12), a fan seat (3) accommodating a fan (3), an air-flow guiding-out pipe (4) and an ion induction electrode (5) used for capturing air ions, wherein the air inlet of the air-flow guiding-out pipe (4) is hermetically connected with an opening at the side wall of the collection pipe (1), the air outlet of the air-flow guiding-out pipe (4) is connected with the fan seat (3), and the air-flow guiding-out pipe (4) is transversely connected with the sidewall opening near the fixed end of the collection pipe (1) so as to allow air flow in the collection pipe (1) to transversely flow out. The air ion detection apparatus provided by the invention can effectively shield interfering electromagnetic fields, eliminate air-flow rotation effects and ensure no adhesion and accumulation of air impurities on the ion induction electrode, and cleaning-free long-term operation of the air ion detection apparatus is realized.

Description

technical field [0001] The invention belongs to the field of air ion detection, and in particular relates to an air ion detection device capable of maintaining relatively high cleanliness. Background technique [0002] At present, there are mainly two technologies for the collection and detection of air ion concentration, one is the flat capacitive type, and the other is the coaxial capacitive inline type. [0003] The flat capacitive ion collection device is composed of one or more sets of parallel electrodes, and a voltage is applied to the parallel electrodes to form a space electric field between the parallel electrodes. When the gas flow passes the parallel electrodes, the positive ions in the gas flow are captured by the negative electrode plates and the negative ions are captured by the positive electrode plates. The detection circuit connected to the parallel electrodes detects the electric quantity obtained by the parallel electrode plates and the air volume passin...

AI Technical Summary

Problems solved by technology

Coaxial capacitive in-line ion collection device, because the position of the inner electrode lead-out wire is in front of the fan, the inner electrode lead-out wire will be exposed to the running airflow, which is easy to be polluted, and the stability and accuracy of the long-term operation of the system cannot be guaranteed; in addition, the axial flow When the fan is running, a rotating airflow is generated, and the electric field captures air ions in a rotating path, which will cause ion mobility errors and affect measurement accuracy

[0006] In particular, for the online and long-running air negative ion detection equipment installed in the wild uninhabited area, the cleaning and maintenance tasks caused by the frequent contamination of the equipment by air impurities will consume a lot of manpower and material resources

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