JPH02222738A - Classifying collection apparatus of aerosol dispersed component particle - Google Patents

Abstract

PURPOSE:To classify and collect by means of the electrical movability of individual particle by gradually increasing the voltage of collection plate from the inlet side collection chamber of aerosol in the particle collection apparatus to the outlet side collection chamber. CONSTITUTION:When the particles a1-an which are dispersed component of aerosol are precipitated and stuck to a body, the particles are collected on collecting plates 31-3n while being classified by using gravity force, inertia force and electrostatic force. Plural collection chambers A1-An connected in multistage are provided in a main body 1, and communicated with an inlet injection port 21 of the uppermost stage and the discharge port 7 of the lowermost stage, and the injection port communicated with plural neighboring collection chambers with each other. Particle collection plates 31-3n are disposed in the plural collection chamber so as to confront the injection ports 21-2n. And, plural voltage supply source 51-5n the voltage of which is optionally adjustable are respectively connected with the plural collection plate 31-3n. As a result, the dispersed particles of aerosol are classified and collected by the electrical movability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for classifying and collecting particles that are dispersed components of aerosol.

[Conventional technology]

A particle collection device that sorts and collects fine particles uses gravitational and inertial forces when fine particles settle on objects.

There are things that are classified and collected based on the difference in the magnitude of electrostatic force.

A cascade invactor is generally used as a device to collect particles while classifying them according to the purpose.For example, such a device is described in William C. Hines, translated by Hayayo-ya. Aerosol Technology (1985) pp. 116-123, or
It is discussed in detail in pages 60 to 63 of the Aerosol Technology Basic Course Textbook (1983), sponsored by the Aerosol Research Council. In addition, as a method for determining the yield of particles after collection, there is a method that combines an impactor and an electric force and applies a potential difference between collection plates.
It is disclosed in Japanese Patent No. 9643.

In addition, mobility analyzers have traditionally been widely used as devices for collecting particles, which are the dispersed components of aerosols, using electrical mobility. Course Text (11185) No. 13
This is discussed in detail on pages 16 to 16, and related techniques are disclosed, for example, in Japanese Patent Application Laid-Open No. 120651/1983.

[Problem to be solved by the invention]

In a cascade invactor, in which the aerosol flow passes from surface to surface at an increasing speed, it is possible to separate and collect particles with different inertias, but it is not possible to classify and collect particles based on differences in their electrical mobility. There was a problem. In addition, although mobility analyzers can classify particles based on their electrical mobility, they do not have a collection function, so a separate device is required to collect them, and particles with different electrical mobilities can be classified using mobility analyzers. They could not be taken out at the same time.

An object of the present invention is to provide an apparatus that can classify and collect particles, which are dispersed components of an aerosol, according to their individual electrical mobilities.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention aims to reduce the gravitational force, inertial force, and
A device that uses electrostatic force to collect the particles while classifying them onto a collection plate, wherein a plurality of collection chambers are provided in series, and the plurality of collection chambers are an inlet injection port in the uppermost stage; A main body that communicates with a lowermost discharge port and an injection port that communicates between adjacent ones of the plurality of collection chambers, and a particle trap arranged in the plurality of collection chambers opposite to the injection port. The main feature is that it includes a collecting plate and a plurality of voltage supply sources that are connected to each of the plurality of collecting plates and can be adjusted to any voltage.

[Effect]

In the classification and collection device of the present invention, a voltage can be applied to the collection plate, and a Coulomb force acts between the charged aerosol and the collection plate. When the voltage on the collection plate is gradually increased from the collection chamber to the collection chamber on the discharge side, the electric field strength around the collection plate also increases, so as you proceed from the inlet stage to the discharge stage, the voltage on the collection plate increases. can collect particles with low mobility.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a cross-sectional view of a device according to a first embodiment of the present invention, in which particles as an aerosol dispersion component of a single diameter are introduced and are classified and collected according to the number of valence electrons.

First, the configuration of the embodiment will be explained. In this figure, 1 is the aerosol capture device main body (hereinafter referred to as the main body).

As+Ax, . . . A1 are aerosol collection chambers (hereinafter referred to as first, second, . . . n-th stage collection chambers) arranged in the upper and lower directions, and respectively injection ports 21-2n, and collection plates 31-2n facing thereto.
3n are arranged. The collection plates 31-3n are attached to holding members 41-4n made of an insulator, removably attached to the main body 1, and connected to voltage supply sources 51-5n, respectively. The diameters of the injection ports 21 to 2n are the same for each stage, and a hose 6 for supplying aerosol is connected to the tip of the injection port 21 of the collection chamber At in the uppermost stage.

A filter 8 is provided in the lowermost collection chamber A in front of an exhaust lower, and the exhaust lower is connected to a pump (not shown).

Next, the operation of this embodiment will be explained. The dispersed component particles of the aerosol that flow in from the inlet injection port have a diameter d, and are collected by the respective collection plates 31 to 3n as particles at, a2. ...
an is a valence electron of b1 or more, b 1 to b x
, ・= b ll-1~b, pieces (bt>bz・=>b
, ) shall have. The voltage of the collection plates 31 to 3n at each stage is vxe Vzs...■ゎ (V t <Vz...
・<Vn).

First, the speed of the inflowing gas is determined so that the cut-off diameter when no voltage is supplied to each collection plate 31 to 3n is larger than d.

Next, determine the minimum voltage v1 at which particles a1 having a valence electron number b1 or more are collected in the first stage collection chamber A1 by Coulomb force, and the second stage collection chamber A2 has a valence electron number bl. Particles a2. Determine the minimum voltage ■2 at which is collected.

Collection chamber A8 after the third stage. Aa...AE1 also determines the voltage in the same way, and the final stage A++ has the number of gi electrons. −
■ such that particles an ranging from 1 to bfl are collected.

Establish. Particles that are not collected in the final stage collection chamber An are collected by the filter 8. In this way, after the voltages VtwVz...vn are determined, suction of one particle is started, and the suction ends when the appropriate particle can be collected on the collection plate.

Thereafter, by taking out the collection plate and performing weighing or counting, the distribution according to the number of valence electrons can be determined.

In this embodiment, the speed of the inflowing gas is initially determined so that the cut-off diameter when no voltage is supplied to each collection plate 31 to 3n is set to a value larger than d.
You may adjust by the diameter of n or the distance between the injection ports 21 to 2n and the collection plates 31 to 3n.

FIG. 2 is a sectional view of a classification and collection device according to a second embodiment of the present invention. The configuration differs from the first embodiment in that injection port adjustment plates 91 to 9n are detachably attached to the main body so that the diameter of the injection ports 21 to 2n of the collection chambers in each stage can be adjusted. The point is that there is. FIG. 3 is a top view of the nozzle adjustment plate 91. The nozzle adjustment plate 91 has an adjustment nozzle 101 opening in the center, and a drawer and insertion hole on the side for attachment and detachment from the main body 1. A detachable member 11 is attached.

The operation of this embodiment will be explained. If the same adjustment injection ports 101 to 10n are selected for the injection port adjustment plates 91 to 9n of the collection chambers of each stage, as in the first embodiment, when single-diameter particles are allowed to flow in. It is possible to perform classification collection based on the number of valence electrons. From the first stage collection chamber A1 to the nth stage collection chamber A. Adjustment injection port 101 with a diameter that gradually decreases as it progresses to
If the injection ports/adjustment plates 91 to 9n each having an Ion are selected and voltage is not supplied from the voltage supply reducer 5 to the collection plates 31 to 3n, it is possible to have them function as a conventional cascade inductor. Adjustment injection port 101~I
Particles larger than the cut-off diameter determined by the diameter of the on are collected at each stage and separated.

In this embodiment, by replacing the injection port adjusting plates 91 to 9n with the same device, it is possible to perform both classification collection based on the number of valence electrons and collection based on particle size.

〔Effect of the invention〕

According to the present invention, particles that are dispersed components of an aerosol can be classified according to their individual electrical mobilities.

[Brief explanation of the drawing]

1 is a cross-sectional view of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a second embodiment of the present invention, and FIG. 3 is a top view of the injection port adjusting plate of FIG. 2. 2... Injection port, 3... Collection plate, 4... Holding member,
5... Voltage supply source, 9... Jet outlet adjustment plate, 10...
・Adjustment spout. Otsu-\

Claims (1)

[Scope of Claims] 1. A device that uses gravity, inertial force, and electrostatic force when particles, which are dispersed components of an aerosol, are deposited on an object and collects the particles while sorting them on a collection plate, A plurality of collection chambers are arranged in a row in multiple stages, and the plurality of collection chambers are an inlet jet port at the top stage, a discharge port at the bottom stage, and a jet port that communicates between adjacent ones of the plurality of collection chambers. a plurality of particles connected to each of the plurality of collection plates and adjustable to any voltage; A voltage supply source and an aerosol dispersion component particle classification/collection device. 2. In a device that uses gravity, inertial force, and electrostatic force when particles, which are dispersed components of aerosol, are deposited on an object, and collects the particles while sorting them on a collection plate, including a plurality of devices installed in multiple stages. a main body having a collection chamber, wherein the plurality of collection chambers are connected by an inlet nozzle at the top, an outlet at the bottom, and a nozzle that communicates between adjacent ones of the plurality of collection chambers; a particle collection plate disposed in the plurality of collection chambers facing the injection port; a plurality of voltage supply sources connected to each of the plurality of collection plates and adjustable to any voltage; An apparatus for classifying and collecting aerosol dispersed component particles, comprising the inlet injection port and means for changing the diameter of the injection port.