JPH0811526A - Dust filter - Google Patents

Abstract

PURPOSE:To prolong a span of service life in a dust filter by racing the reducing of ventilation resistance, and decreasing the lowering of a collection rate when used for months. CONSTITUTION:A dust filter 1 is provided with a grating part 15 electrified to a first filter part 2, while it installs a second filter part 3 capturing particles by means of filtration after being coupled with the first filter part 2. The grating part is little in air-flow resistance, adsorbing these particles in the air. Thus, these particles are filtered by the second filter part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting filter having a long service life by reducing ventilation resistance and reducing a decrease in dust collecting rate after long-term use.

[0002]

2. Description of the Related Art A conventional air purifier mainly charges particles in the air by corona discharge, and collects the particles at the dust collecting electrode by Lorentz force generated by an electric field between the particles and the dust collecting electrode. There is an electric air purifier that operates, and a forced air purifier that simply filters particles in the air with a dust filter.

The electric air purifier has a high dust collection rate for collecting particles in the air as compared with the above-mentioned forced air purifier, and has a long life because there is little clogging in the dust collection filter. There are advantages. In general, an industrial electric air purifier performs negative corona discharge in which particles in the air are likely to grow. In addition, since a large amount of ozone is generated during negative corona discharge, household electric air purifiers are often used that perform positive corona discharge.

However, since such an electric air purifier requires a high voltage for corona discharge, a special voltage converter is required for a vehicle such as an automobile which has only a low voltage. Is.

Therefore, an air purifying apparatus used for an automobile, etc., forcibly sucks in air by a fan,
Forced air purifiers that filter air with dust filters in the equipment are often used. This forced air purifier has a dust collecting filter 21 as shown in FIG. 4 which has an enlarged dust collecting area by pleating in order to pass air through the dust collecting filter to remove particles in the air and filter the air. Alternatively, the first dust collecting filter 31, the second dust collecting filter 32, and the third dust collecting filter 33 as shown in FIG. The idea was to extend the life by preventing clogging.

Further, as a method of obtaining the above-mentioned effect without changing the structure of the dust collecting filter, when the clogging of the dust collecting filter is detected and the dust collecting rate becomes equal to or less than the set value, the The flow was reversed to blow off the particles on the dust collecting filter.

[0007]

However, by using the pleated dust collecting filter, the filtering area of the dust collecting filter can be increased and the dust collecting ability can be improved. However, in the pleated dust collecting filter, There is a limit to the ratio of the area to be increased because the ventilation resistance increases.
On the other hand, using a dust collection filter laminated in multiple layers
Generally, since the ventilation resistance of a dust collecting filter is proportional to the dust collection rate, simply stacking layers adds the ventilation resistance, and the ventilation resistance was also increased. Therefore, the use of these dust collection filters results in increased ventilation resistance, which reduces the amount of air that passes through the dust collection filter and reduces the dust collection rate, or does not reduce the amount of air drawn in. You either needed a higher power fan.

[0008] Therefore, an object of the present invention is to provide a dust collecting filter having a long life by reducing the ventilation resistance and reducing the deterioration of the dust collecting rate after long-term use.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to a first filter portion charged with air for allowing particles in the air to be electrically adsorbed, and the first filter portion. A dust collecting filter having a structure in which a second filter unit for filtering particles in the air larger than the mesh of the filter unit is combined, wherein the first filter unit is a belt-shaped band formed by weaving electrically treated fibers. A plurality of lattice portions are provided by a sheet.

[0010]

The dust collecting filter of the present invention constructed as described above operates as follows.

Particles in the air that pass through the dust collecting filter of the present invention pass through the first lattice-shaped filter portion in which the fibers are charged, so that the charge of the electrostatically charged particles and the first filter portion. Particles in the air can be adsorbed to the lattice portion of the first filter portion according to the Lorentz force generated according to the strength of the electric field between the lattice portions of the. Further, for example, particles having a small amount of electrostatic charge or particles having a large weight of particles may be adsorbed to the lattice part of the first filter unit by the Lorentz force generated between the lattice part of the first filter unit and the charges of the particles. Since it cannot be performed, it passes through the first filter unit. And
Of the particles that have passed through the first filter unit as described above, the second
Particles larger than the size of the mesh of the filter part will be filtered by the second filter part. In the case where the second filter unit is installed upside down so that air passes through to the first filter unit, coarse dust is filtered by the second filter unit to remove coarse dust, and then finer dust is generated by the first filter unit. To remove.

On the other hand, the air passing through the lattice portion of the first filter portion is collected because the turbulent flow of air is rectified within the size of the lattice portion by the lattice portion of the first filter portion. It reduces the generation of vortices that increase the ventilation resistance after passing through the dust filter. In addition, from the second filter section to the first
Even when the filter is installed upside down so that air can pass through, the air is rectified by the first filter as in the case described above.

Therefore, in the dust collecting filter of the present invention, the ventilation resistance of the second filter portion is mainly used, and further, since the vortex is not generated in the air passing through the lattice portion of the first filter portion, the ventilation resistance can be reduced. it can. Further, in the dust collecting filter of the present invention, static electricity particles in the air are adsorbed by the lattice portion of the first filter portion, and particles in the air larger than the size of the second filter portion by the second filter portion. Since it is filtered, it is possible to reduce the decrease in the dust collection rate after long-term use.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

The dust collecting filter 1 of this embodiment has a first filter portion 2 which is charged to allow air to pass through in the direction of the arrow and electrically adsorb particles in the air, as shown in FIG. The second for further passing the air after passing through the first filter unit 2 and filtering particles in the air larger than the eyes
It has a filter part 3.

In the first filter portion 2, a strip-shaped sheet 13 is formed by laminating a large number of electrically charged polypropylene fibers as shown in FIG. 2 in the air flow direction (arrow).
Weaving the sheet, and forming cuts 11 in the belt-shaped sheet 13 at regular intervals, and further cutting 1 of the other sheet 13
A grid-like lattice portion 15 is provided by fitting with each other. The second filter portion 3 is made of a non-woven fabric or the like that is in contact with the end surface of the lattice portion 15 of the first filter portion 2 and is arranged so as to be orthogonal to the air flow direction as shown in FIG.

The lattice portion 15 is provided by weaving the above-mentioned fibers each having the same dimension as the first filter portion 2 one by one or combining a plurality of boxes having the same size as one lattice portion 15. However, in this case, since it is not necessary to provide the notch 11, a simpler structure can be obtained.
Further, although polypropylene was used as the fiber of the sheet 13 that constitutes the first filter portion 2 in the examples, it does not necessarily have to be a polyolefin-based substance, and the permittivity is high and the electric charge charged in a short period decreases. If not, other high molecular weight organic and mechanically stable organisms may be used. Further, the lattice portion 15 of the first filter portion is not necessarily a quadrangle, has a rectifying action with respect to the flow of air, and may have a circular shape, a hexagonal shape, a triangular shape or the like as long as the dust collection rate is not reduced. In this case, the structural strength of the first filter portion 2 can be increased. The second filter portion 3 may be of a sponge type, a mesh type, or the like, and may be coated or sealed with a deodorant substance such as activated carbon. First
The filter part 2 and the second filter part 3 can be attached either by loose fitting or by sewn together with an adhesive, a fixing metal fitting, a screw and a fiber, or by fixing a cover or the like to the surface of the first filter part 2. However, it may be installed optimally according to the application.

This dust collecting filter operates as follows.

The turbulence of the air sucked in from the direction from the front to the back of FIG.
By passing through 5, the generation of air vortices, which is a cause of increasing the ventilation resistance, is reduced, and the air is rectified within the range of the lattice portion 15. Further, since the first filter portion is provided with the lattice portion 15, the ventilation resistance is small. On the other hand, the particles in the air that are sucked in from the direction from the front to the back in FIG. 1 are the charges of the particles electrostatically charged by the first filter unit 2 and the electric field between the lattice unit 15 of the first filter unit 2. Particles in the air are adsorbed by the lattice portion 15 of the first filter portion 2 according to the Lorentz force generated according to the strength. Also,
For example, particles having a small amount of static electricity or particles having a large weight are charged by the Lorentz force generated between the lattice portion 15 of the first filter unit 2 and the charges of the particles by the first filter unit 2.
Since it cannot be adsorbed to the lattice portion 15 of the first filter portion 2, it passes through the first filter portion 2. Then, among the particles that have passed through the first filter unit 2 as described above, particles larger than the mesh size of the second filter unit 3 will be filtered by the second filter unit 3.

The turbulence of the air sucked in from the direction of the arrow from the back to the front in FIG. 1 causes the vortex of the air, which causes the ventilation resistance to increase by passing through the lattice portion 15 of the first filter portion 2. Is reduced and is rectified within the range of the lattice portion 15. Further, since the first filter portion is provided with the lattice portion 15, the ventilation resistance is small. On the other hand, particles in the air that are sucked in from the direction of the arrow from the back to the front in FIG. 1 are larger than the size of the mesh of the second filter unit 3, and the particles of the second filter unit 3 are filtered. Particles smaller than the size of pass through the second filter unit 3. Then, the small particles that have passed through the first filter unit 2
The particles are attracted to the lattice portion 15 of the first filter portion 2 according to the Lorentz force generated according to the electric charge of the particles charged by static electricity and the strength of the electric field between the lattice portions 15 of the first filter portion 2.

By constructing and operating as described above, the present filter has a small ventilation resistance in the first filter portion, and further has a lattice portion in the first filter portion to rectify the turbulence of air and generate a vortex by the ventilation resistance. Since it prevents the increase of air flow, the ventilation resistance can be reduced. In addition, this filter increases the dust collection rate because the second filter filters the remaining particles in the air after adsorbing the electrostatically charged particles in the air by the charged first filter unit. be able to.
Further, since the present filter is composed of the first filter portion and the second filter portion, the rigidity is further increased and the filter can be easily attached and detached and handled.

[0022]

As described above, in the dust collecting filter of the present invention, the ventilation resistance is reduced by providing the first filter portion with the lattice portion, and the turbulent flow of the air to be filtered is rectified by the lattice portion. Since the generation of air vortices is reduced, ventilation resistance can be reduced. When this filter is installed in the air passage of the air conditioner, noise can be reduced by the air rectifying action, and further, by installing this filter in front of a heat exchanger through which air passes, heat can be reduced. Since the air flowing through the exchanger can be made uniform, the heat exchange rate can also be improved. Also, this filter is
Since the first filter portion provided with the charged grid portion adsorbs electrostatically charged particles in the air and the second filter portion filters the remaining particles in the air, the dust collection rate can be increased. At the same time, the life can be extended. Further, since the present filter is composed of the first filter portion and the second filter portion, the structural rigidity can be increased, and therefore the handling becomes easy.

[Brief description of drawings]

FIG. 1 is a drawing for explaining a structure of a dust collecting filter of the present invention.

FIG. 2 is a drawing for explaining a configuration of a first filter portion of the dust collecting filter of the present invention.

FIG. 3 is a drawing for explaining a configuration of a second filter portion of the dust collecting filter of the present invention.

FIG. 4 is a view for explaining the structure of a conventional dust collection filter.

FIG. 5 is a drawing for explaining the configuration of a conventional dust collection filter.

[Explanation of symbols]

1, 21 ... Dust collection filter, 2 ... First filter part, 3 ... Second filter part, 13 ... Sheet, 15 ... Lattice part, 31 ... First dust collection filter, 32 ... Second dust collection filter, 33 ... Three
Dust filter.

Claims (1)

[Claims] 1. A first filter part (2) which is charged in order to allow air to pass therethrough and to electrically adsorb particles in the air,
A dust collecting filter having a structure in which a second filter part (3) for filtering particles in the air larger than the eyes of the first filter part (2) is combined, wherein the first filter part (2) is A dust collecting filter, wherein a plurality of lattice portions (15) are provided by a belt-shaped sheet (13) formed by weaving electrically treated fibers.