JPH0640974B2 - Dust collector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dust collector that removes dust, metal particles, metal ions, etc. in the air.

(Prior Art) In the fields of electronics industry, machine industry, chemical industry, etc., a dust collector is used to remove dust in the room air and fine particles such as metal particles and metal ions.

As this dust collecting device, a filter (usually a so-called HEPA filter having a capture rate of 99.995% of fine particles having a particle size of 0.1 μm) is conventionally used, and air passes through the filter to obtain the fine particles in the air. It is generally used to capture the light on a filter. Further, there is also used an electrostatic precipitator in which air is ionized by forming a high-voltage electrostatic field and performing corona discharge so that fine particles in the air charged by the ions are attached to the positive electrode plate.

(Problems to be Solved by the Invention) However, in recent years, due to development of, for example, laser processing and electric discharge processing, metal particles and metal ions having a particle diameter of 0.1 μm or less are generated, and these fine particles can be reliably captured. Although a dust collector is required, it has been difficult to capture fine particles having a particle diameter of 0.1 μm or less in any of the above-mentioned conventional dust collectors.

An object of the present invention is to provide a dust collector that can effectively capture even fine particles having a particle size of 0.1 μm or less.

(Means for Solving Problems) The present invention is characterized in that a conventional electrostatic precipitator uses only an electric field, but also uses a magnetic field.

According to the present invention, there is provided a dust collector including a charging unit that forms an unequal electric field and a magnetic field and a dust collecting unit that forms an unequal electric field and a magnetic field in a case having an air inlet and an air outlet.

(Operation) The fine particles existing in the air introduced into the case are affected by the unequal electric field and magnetic field formed in the charging means,
Due to the action of the magnetic field, ionization is promoted as the resident time in the magnetoelectric field becomes longer. The sufficiently ionized fine particles are captured by the dust collecting means. Since the dust collecting means also has an equal electric field and a magnetic field, the action of the magnetic field prolongs the standing time in the magnetic electric field. Therefore,
The dust collecting means efficiently captures fine particles that are sufficiently ionized and have a long residence time.

(Example) Hereinafter, the present invention will be specifically described based on illustrated examples.

1 to 3 show an embodiment of the dust collecting apparatus according to the present invention. FIG. 1 is a schematic sectional view of the structure, and FIG. 2 is a perspective view showing a charging means and a dust collecting means. The figure is a plan view of the charging means and the dust collecting means. In the figure, 1 is a case of a dust collector, which is provided with an air inlet 1a and an air outlet 1b. Reference numeral 2 denotes a blower arranged at the air inlet 1a, which introduces indoor air into the case 1. Numeral 3 is a charging means arranged at the latter stage of the blower 2, and as shown in FIGS. 2 and 3, a plurality of load electrode plates 3a made of a conductive magnetic material and arranged at intervals. , And a plurality of discharge electrodes 3b arranged between the load electrode plates 3a ,. In the charge means 3, the discharge electrodes 32, ... Are connected to the plus side of the power source 4 and the load electrode plates 31, ... are connected to the minus side, respectively, as shown in FIG. 3, and a high voltage is applied between the two electrodes. This creates unequal electric and magnetic fields between the poles.

Denoted at 5 is a dust collecting means disposed downstream of the charging means 3 and is composed of a plurality of dust collecting electrode plates 5a, which are made of a conductive magnetic material and are arranged at intervals. The dust collecting means 5
, The dust electrode plates 5a, ... Are alternately connected to the plus side and the minus side of the power source 6, respectively, as shown in FIG. A uniform electric field and magnetic field are generated in.

The dust collecting apparatus according to this embodiment is configured as described above, and the electric field and magnetic field generated by the charging means 3 and the dust collecting means 5 are parallel to each other.

Next, the operation of this embodiment will be described.

The air introduced into the case 1 from the air inlet 1a by the blower 2 enters between the load electrode plates 3a, ... Of the charging means 3.
Since the unequal electric field and the magnetic field are formed between the load electrode plates as described above, the air containing the introduced fine particles is affected by the magnetic field and the unequal electric field. First, in the action by the magnetic field, the charged or polarized particles are subjected to the action of the magnetic field with respect to the velocity component in the direction perpendicular to the magnetic field, the velocity thereof is reduced with respect to the flow velocity of air, and the particles tend to stop in the electromagnetic field. or,
Particles that are not charged or polarized are also ionized and polarized by the magnetic field. The thus polarized and ionized fine particles are subjected to the action of an unequal electric field and are attracted to a strong electric field to be further ionized. The air containing the ionized fine particles then enters between the dust collecting electrode plates 5a, ... Of the dust collecting means 5.
Since the equal electric field and magnetic field are formed between the dust collecting plates as described above, the ionized fine particles present in the introduced air are given a force to move along the electric field,
Fine particles having polarities corresponding to the respective dust collecting electrode plates 5a, ... Are adsorbed and captured. At this time, since a magnetic field is formed between the dust collecting electrode plates 5a, ... As described above, the particles crossing the magnetic field try to stop in the electromagnetic field due to the reduced flow velocity as described above. , The efficiency of being captured by the dust collecting electrode plates 5a ,.

FIG. 4 shows another embodiment according to the present invention and is a perspective view of the charging means and the dust collecting means. In the figure, 30
Is a charging means, and a plurality of magnet plates 31 are arranged substantially parallel to each other at intervals, and a plurality of magnet plates 31 are arranged between the respective magnet plates at predetermined intervals via insulating parts 32 and are arranged substantially parallel to each other. The plurality of load electrode plates 33, ..., And the plurality of discharge electrode plates 34, ... Arranged in the space A formed by the respective load electrode plates 33 ,. It is composed of and. Each discharge electrode 34 of the charging means 30 is connected to the plus side of the power source, and the load electrode plate 33 is connected to the minus side of the power source, similarly to the discharge electrode 3b in the above-mentioned embodiment, and a high voltage is applied between both electrodes. By applying, an unequal electric field is formed between both electrodes. Therefore, in the spaces A formed by the load electrode plates 33, ... And the magnet plates 31 ,.

Reference numeral 50 denotes a dust collecting means, and a plurality of magnet plates 51, ... Arranged substantially parallel to each other at intervals, and insulating members 52 ,. .. are arranged in parallel with each other. In addition, the plurality of dust collecting electrode plates 53 of the dust collecting means 50.
Are alternately connected to the positive side and the negative side of the power source as in the above-mentioned embodiment, and by applying a high voltage between the both electrodes, a uniform electric field is formed between the two electrodes. Therefore, in each space B formed by the dust collecting electrode plates 53, ... And the magnet plates 51 ,.

The present embodiment is configured as described above, and the charging means 30
The fine particles existing in the air introduced into the space A are subjected to the action of a magnetic field and an unequal electric field. That is, when the particles cross a magnetic field at a right angle, a voltage is generated and polarization or ionization energy is given. The Lorentz force acts on this electric charge, and the fine particles make a rotational movement in a direction perpendicular to the direction of the air flow, and try to stop in the magnetic field. Since the unequal electric field is formed here, the fine particles are attracted to the strong electric field and given sufficient ionization energy to be further ionized. As described above, in the charging means 3, the ionization efficiency is enhanced by the presence of the magnetic field, and the fine particles existing in the air are sufficiently ionized. The air containing fine particles ionized by passing through the charging means 30 then enters the space B of the dust collecting means 50. Since a uniform electric field is formed in the space B, the ionized fine particles present in the introduced air are given a force to move along the electric field, and the dust collecting electrode plates have corresponding polarities. Particles are adsorbed and captured. At this time, since the magnetic field is formed in the space B as described above, the fine particles that cross the magnetic field undergo the rotational movement as described above, and the particles in the space B in the electric field of the magnetic field are present. Because it takes longer time
The efficiency of being captured by the dust collecting electrode plates 53, ...

The present invention has been described above based on the illustrated embodiments, but the present invention is not limited to those shown in the embodiments, and various modifications are possible within the scope of the gist of the present invention.
They are not excluded from the scope of the present invention.

(Effects of the Invention) As described above, the dust collector according to the present invention is configured to form the magnetic field and the electric field in the charging means and the dust collecting means 5. The residence time becomes long, the ionization of the fine particles can be promoted in the charging means, and the trapping efficiency of the sufficiently ionized fine particles can be improved in the dust collecting means. Therefore, magnetic particles and diamagnetic particles, which cannot be captured by the conventional electrostatic precipitator using only the electric field, can be captured by the action of the magnetic field, and the particle size is 0.1
It becomes possible to capture fine particles of μm or less. Therefore, it is possible to capture metal particles and metal ions generated during laser processing or electric discharge processing, which have been conventionally difficult.

[Brief description of drawings]

1 to 3 show an embodiment of a dust collecting apparatus according to the present invention, FIG. 1 is a schematic sectional view of the structure, FIG. 2 is a perspective view of a charging means and a dust collecting means, and FIG. Is a plan view of the charging means and the dust collecting means, and FIG. 4 is a perspective view of the charging means and the dust collecting means showing another embodiment of the present invention. 1 ... Case, 2 ... Blower, 3, 30 ... Charging means,
3a, 33 ... Load electrode plate, 3b, 34 ... Discharge electrode, 31
...... Magnetic plate, 5,50 ...... Dust collecting means, 5a, 53 ...... Dust collecting electrode plate, 51 ...... Magnetic plate.

Claims (5)

[Claims] 1. A case having an air inlet and an outlet,
A dust collecting apparatus comprising: a charging unit that forms an unequal electric field and a magnetic field; and a dust collecting unit that forms an unequal electric field and a magnetic field. 2. The charging means is composed of a plurality of load electrode plates made of a conductive magnetic material and arranged substantially parallel to each other, and discharge electrodes arranged between the load electrode plates. The dust collector according to claim (1). 3. The charging means comprises a plurality of magnet plates arranged substantially parallel to each other, a plurality of load electrode plates arranged substantially parallel to each other with a wire connecting member interposed therebetween, The dust collecting apparatus according to claim (1), wherein the dust collecting apparatus is configured by a discharge electrode disposed in a space formed by each load electrode plate and each magnet plate. 4. The dust collecting means is constituted by a plurality of dust collecting electrode plates made of a conductive magnetic material and arranged substantially in parallel with each other. Dust collector. 5. The dust collecting means comprises a plurality of magnet plates arranged substantially parallel to each other, and a plurality of dust collecting electrode plates arranged substantially parallel to each other with a wire connecting member interposed therebetween. The dust collector according to claim (1), characterized in that it is constituted by: