JPH08215524A - Filter - Google Patents

Abstract

PURPOSE: To provide a filter having a log life enabling to eatch and remove coarse dust and fine dust in a dust-containing gas by oneself. CONSTITUTION: The filter consists of a casing 10 for allowing the dust-containing gas to pass through, a filter medium 15 spirally arranged in the casing 10 and dust catching parts 2 for catching the coarse dust arranged in the inside wall of the casing 10. The casing 10 has a square form and the dust catching parts 2 are arranged at corner parts 101 of the casing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for removing dust in a gas such as air.

[0002]

2. Description of the Related Art Conventionally, in order to reliably collect dust of various sizes such as fine dust and coarse dust over a long period of time, filters with different performances are provided in multiple stages, and coarse dust is generated by sequentially passing gas. A dust collecting device for sequentially removing dust is widely known.

As the dust collecting device 89, for example, as shown in FIG.
A pre-filter 891 for collecting coarse dust 45 is arranged at the most upstream side of the gas flow, and a medium performance filter 892 for collecting dust having a particle size smaller than that of the coarse dust 45 is arranged immediately downstream thereof. There is a device.

And, at the most downstream side of the duct 890,
High-performance filter 893 for collecting the fine dust 46
Is provided. Further, in the figure, reference numeral 899 is a suction blower.

On the other hand, a filter for separating and removing coarse dust by centrifugal force is also proposed in Japanese Utility Model Laid-Open No. 62-72110.

[0006]

[Problems to be Solved] However, in the filter using the centrifugal separation as described above, since the outlet is directly opened on the side surface of the casing, dust is allowed to pass through, and a further filter is required. There was a problem. Moreover, there is also a problem that a considerable physique is required to satisfactorily settle the dust.

Further, the coarse dust and the fine dust just collected on the surface of the spiral filter are wound up by the spiral flow formed by the centrifugal force, and the coarse dust and the fine dust are scattered in the filter. There is a risk. If this phenomenon occurs, the expected filtering performance cannot be obtained with the above filter.

In view of the above problems, the present invention is intended to provide a filter which can collect and remove coarse dust and fine dust in the dust-containing gas independently and has a long life.

[0009]

The present invention relates to a casing that allows a gas containing dust to pass therethrough, a filter medium spirally arranged in the casing, and a dust trap for collecting coarse dust disposed on the inner wall of the casing. And a collecting section (hereinafter referred to as a first invention).

The gas flows in parallel to the central axis of the spiral of the spirally arranged filter medium. Next, in arranging the filter medium in a spiral shape in the casing in the filter, for example, it is preferable to assemble a preformed spiral filter medium into a desired casing. In this case, the filter can be easily manufactured. The spiral filter medium is
For example, a wavy filter medium in which peaks and valleys are formed alternately
It can be constructed by arranging it around the support column (Figs. 1 to 3).

At this time, between the wavy filter material and the support,
It is preferable to bond and fix with an adhesive or the like so that a gap is not generated. In addition, when the spiral filter medium is assembled to the casing, it is preferable that the spiral filter medium be bonded and fixed with an adhesive so that the inner wall of the casing is sealed.

The filter medium may be made of a non-woven fabric made of electret fiber, glass fiber or the like. In addition, epoxy-based,
Urethane adhesives can be used.

Next, the dust collecting portion can be constructed as a separate body from the casing. When the casing has a square shape, it is preferable that the dust collecting portion is arranged at a corner portion of the casing.
In the above-mentioned angular casing, by arranging the filter media in a spiral shape, spaces are naturally created at the corners. Therefore, the dust trap is placed in this space. As a result, the coarse dust trapped in this space can be completely trapped, and the deterioration of the filtering performance of the filter due to the re-scattering of the coarse dust can be prevented.

The gas outlet side of the casing is preferably closed by a filter medium. As a result, the filtered gas can be prevented from flowing out of the filter while containing the fine dust.

Next, a filter different from the above will be described below. It is characterized in that it comprises a casing through which a gas containing dust passes and a filter medium spirally arranged in the casing, and the outlet side of the gas in the casing is closed by the filter medium. There is a filter (hereinafter referred to as the second invention).

Further, on the gas outlet side, it is preferable to bond the filter medium and the filter medium or the filter medium and the casing with an adhesive or the like. As a result, the filtered gas can be prevented from flowing out of the filter while containing the fine dust.

[0017]

In the filter of the first invention,
The filter medium is spirally arranged in the casing. Therefore, the dust-containing gas flowing into the filter flows along the general shape of the spiral filter medium, forming a spiral flow inside the filter. In the above spiral flow, centrifugal force acts on coarse dust in the gas (cyclone effect),
It is trapped on the inner wall of the casing. On the other hand, fine dust in the gas is generated when the gas passes through the filter medium itself.
By the filtering action in the filter medium, it is collected in the filter medium.

As a result, one filter can collect and remove coarse dust and fine dust at the same time.
In addition, since coarse dust does not accumulate on the surface of the filter medium, it is possible to prevent damage to the filter due to pressure loss and deterioration of filtration performance. Therefore, it is possible to obtain a long-life filter that can be used without maintenance for a long period of time.

Further, in the second aspect of the invention, when the gas is discharged from the filter, it always passes through the filter medium. Therefore, it is possible to collect fine dust, which has a particularly small particle size and is difficult to filter only by the cyclone effect in the spiral flow, by the filtering action of the filter medium itself.

As described above, according to the present invention, the coarse dust and the fine dust in the dust-containing gas can be collected and removed independently, and a filter having a long life can be provided.

[0021]

【Example】

Embodiment A filter according to an embodiment of the present invention will be described with reference to FIGS. The filter 1 of this example includes a casing 10 for passing a dust-containing gas 40 containing coarse dust and fine dust, a spiral filter medium 15 spirally arranged in the casing 10, and an inner wall of the casing 10. And a dust collecting section 2 for collecting coarse dust.

The filter 1 of this example is arranged transversely in a duct through which a gas such as air flows. The filter 1 is preferably arranged in a duct in which gas flows in the gravity direction, but it may be a horizontal duct.

A spiral filter medium 1 is obtained by pleating the casing 10 in advance and then processing the pleat into a spiral shape.
5 are arranged. The spiral filter medium 15 is formed by spirally winding a corrugated filter medium 150 made of electret fiber around a core member 159 having a plate-shaped cross section arranged along the axial direction of the casing 10. Then, the spiral filter material 15 and the core material 15
9 and 9 are adhered and fixed by an epoxy adhesive.

FIG. 1 shows the inflow surface 11 into which the dust-containing gas 40 flows. The inflow surface 11 is orthogonal to the central axis of the spiral in the spiral filter medium 15. Therefore, the dust-containing gas 40 flows in parallel to the central axis. Inflow surface 1
In No. 1, the corrugated filter medium 150 and the casing 10 are not completely closed, but open at the start of the spiral.

FIG. 2 shows the discharge surface 12 of the clean gas 49. The discharge surface 12 is orthogonal to the central axis of the spiral in the spiral filter medium 15. On the discharge surface 12, the wavy filter medium 1
The end portion 151 and the outer portion 153 of 50 are adhesively fixed to the inner wall of the adjacent casing 10, and the inner portion 152 of the wavy filter medium 150 is epoxy-based with the other portion of the wavy filter medium 150 that is adjacent on the discharge surface 12. It is adhesively fixed with an adhesive. As a result, the downstream side of the casing 10 is completely closed by the wavy filter medium 150.

Then, in the spaces of the four corners 101 formed by the casing 10 and the spiral filter medium 15, a dust trap composed of a triangular prism-shaped frame 20 as shown in FIGS. The collecting portions 2 are arranged respectively.

The dust collecting section 2 is composed of a triangular tube 20 whose cross section is an isosceles right triangle. The triangular tube 20
Has an inlet opening at a portion intersecting with the spiral filter medium 150, and further has an inlet collecting net 22 at the opening. As shown in FIG. 2, the corner portion 101 is the exit surface 1 of the filter 1.
2, that is, on the lower surface of the casing 10, it is closed by disposing the dust collecting portion 2.

Next, the function and effect of the filter 1 of this example will be described. In the filter 1, the dust-containing gas 40 containing coarse dust and fine dust is filtered as follows.

First, as shown in FIG.
The dust-containing gas 40 flows into the inside of the filter 1 through the inflow surface 11. At this time, since the inflow surface 11 is orthogonal to the central axis of the spiral of the spiral filter medium 15, the inflow surface 11 flows in parallel to the axial direction of the casing 10. Then, the inflowing dust-containing gas 40 is guided by the spiral filter medium 15 to easily form the spiral flow 42.

That is, the dust-containing gas 40 passes through the spiral filter medium 15 and forms a spiral flow 42 along the shape of the spiral filter medium 15 in the casing 10. Then, in the spiral flow 42, the dust-containing gas 40
Centrifugal force acts on the coarse dust inside. Therefore, due to the cyclone effect, the coarse dust is ejected to the outside,
It gradually moves to the inner wall side of the casing 10.

Here, in the filter 1 of this example, since the spiral filter medium 15 is arranged in the casing 10 having a rectangular parallelepiped shape, the corner portion 101 of the casing 10 presents a space. Therefore, the coarse dust naturally causes the corner portion 101.
Accumulated in the dust collecting part 2 of the dust collecting part 2, passes through the entrance collecting net 22 of the dust collecting part 2 and enters the triangular tube 20, and further below the dust collecting part 2 due to the weight of the coarse dust itself. To be trapped. In addition, since the triangular tube 20 is closed at both ends, the coarse dust trapped in the dust collecting section 2 is not discharged.

By the way, the dust-containing gas 40 contains fine dust which is difficult to be collected by the cyclone effect. However, at the exit surface 12, the wavy filter material 15
0, the casing 10, and the corrugated filter media 150 are completely closed.

Therefore, when the dust-containing gas 40 passes through the outlet face 12, a filtered flow 41 passing through the corrugated filter medium 150 is formed. In the filtered flow 41, a normal filtering action occurs, and fine dust is collected by the wavy filter medium 150. As a result, clean clean gas 49 containing neither coarse dust nor fine dust is discharged from the outlet surface 12 of the filter 1.

Therefore, the filter 1 can be used alone to collect and remove coarse dust and fine dust at the same time. Further, since coarse dust does not accumulate on the surface of the corrugated filter medium 150, pressure loss or the like does not occur and the filter 1 is not damaged or the filtering performance is not deteriorated. Further, the filter 1 of this example can be used without maintenance for a long time and has a long life.

Therefore, according to this example, the coarse dust and the fine dust in the dust-containing gas can be collected and removed independently, and a long-life filter can be provided.

When the coarse dust has accumulated in the triangular cylinder 20 to some extent, the triangular cylinder 20 is removed, the coarse dust is discarded, and the dust is set again as described above. Therefore, it is possible to completely prevent re-scattering of the coarse dust in the dust collecting portion 2.

The triangular tube 20 of the dust collecting section 2 may also collect the coarse dust on the lowermost filter medium 150, so that the lower end of the triangular tube 20 may protrude from the filter 1 toward the downstream side. . Further, the triangular tube 20 may be divided for each layer of the filter medium 150.

[Brief description of drawings]

FIG. 1 is a plan view of an inflow surface of a filter according to an embodiment.

FIG. 2 is a plan view of the discharge surface of the filter in the embodiment.

FIG. 3 is an explanatory view of a spiral flow and a filtration flow of dust-containing gas inside the filter in the example.

FIG. 4 is a perspective view of a coarse dust collecting unit in the embodiment.

5 is a sectional view taken along the line AA in FIG.

FIG. 6 is an explanatory view of a filtering device in a conventional example.

[Explanation of symbols]

 1. ． ． Filter, 10. ． ． Casing, 15. ． ． Spiral filter medium, 150. ． ． Wavy filter medium, 40. ． ． Dust-containing gas, 45. ． ． Coarse dust, 2. ． ． Dust collector,

Claims (4)

[Claims] 1. A casing which allows a gas containing dust to pass therethrough, a filter material spirally arranged in the casing, and a dust collecting portion for collecting coarse dust arranged on an inner wall of the casing. A filter characterized by that. 2. The filter according to claim 1, wherein the casing has a square shape, and the dust collecting portion is arranged at a corner portion of the casing. 3. The filter according to claim 1, wherein the gas outlet side of the casing is closed by the filter medium. 4. A casing which allows a gas containing dust to pass therethrough, and a filter medium spirally arranged in the casing, wherein the gas outlet side of the casing is closed by the filter medium. A filter characterized by that.