Unipolar particle charging device and method integrating free ion trapping function
A charging device and particle technology, applied in the direction of electrostatic separation, electrode structure, particle charging/ionization field, etc., can solve the problems that the accuracy of particle charging is affected, the ionization efficiency of the discharge needle is affected, and the discharge needle has particle deposition, etc. Achieve the effects of simple structure, convenient operation, and improved charging efficiency
Active Publication Date: 2018-10-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology
The existing charging device usually directly ionizes the atmosphere, which is easy to pollute the discharge needle, resulting in particle deposition on the discharge needle, affecting the ionization efficiency of the discharge needle, requiring regular cleaning and cannot be used for a long time; in addition, there is no Free ion removal, which will affect the accuracy of the measurement results of the particle charge
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[0032] The present invention will be further described below in conjunction with accompanying drawing:
[0033] Such as figure 1 A unipolar particle charging device with integrated free ion trapping function is shown, including an outer cavity, an inner cavity embedded in the outer cavity, a discharge needle 22 installed in the inner cavity, passing through the The high-voltage electrode 21 connected to the discharge needle 22 behind the outer cavity and the inner cavity, and the collecting electrode 17 installed on the inner cavity after passing through the outer cavity. One end of the high-voltage electrode 21 is connected to a discharge needle, and the other end is connected to a high-voltage power supply. Because many ions are generated when the discharge needle discharges, only a small part of these ions is in contact with the particles and attached to the particles, and most of the rest of the ions are free ions. In order to avoid affecting the measurement results of t...
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The invention relates to a unipolar particulate matter charging device and method with a free ion trapping function. The device comprises an outer cavity body, an inner cavity body, a spray point, a high voltage electrode and a trapping electrode. The outer cavity body comprises an outer cavity body front cover, an outer cavity body back cover and a first hollow cavity. A particulate matter inlet is formed in the outer cavity body front cover. A charging particulate matter outlet is formed in the outer cavity body back cover. The inner cavity body comprises an inner cavity body front cover, an inner cavity body back cover and a second hollow cavity. An ion injection port is formed in the inner cavity body front cover. A clean air inlet which communicates with the second hollow cavity is formed in the inner cavity body back cover. The spray point, the particulate matter inlet, the ion injection port and the charging particulate matter outlet are coaxially arranged. The area between the particulate matter inlet and the ion injection port is a particulate matter charging area. The area between the first hollow cavity and the second hollow cavity is a free ion trapping area. According to the unipolar particulate matter charging device with the free ion trapping function, the defects of the prior art can be overcome, and efficient charging of air particulate matter is achieved.
Description
technical field [0001] The invention relates to the technical field of atmospheric particle charging, in particular to a unipolar particle charging device and method with integrated free ion trapping function. Background technique [0002] In the technical field of atmospheric particle charging, the electric mobility of the particles is usually used to realize the deflection and separation of the particles, and finally realize the measurement of the concentration of the particles. To characterize the electrical mobility of particles, it is necessary to charge the particles first, and then enter the electrotransfer tube for separation and detection. Only by accurately measuring the internal and external charging efficiency and loss efficiency can the inversion of particle concentration be completed. Therefore, particle charging is the most basic and important part of the particle measurement system. [0003] In the process of charging atmospheric particles, particles can be...
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IPC IPC(8): B03C3/38B03C3/41B03C3/45
CPCB03C3/38B03C3/41B03C3/45
Inventor 刘建国余同柱杨义新桂华侨张礁石余赛芬杜朋王文誉程寅王杰陆亦怀刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI