JP2598331Y2 - Unit type filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit type filter capable of reducing the size of a filter device and replacing only a pre-filter.

[0002]

2. Description of the Related Art
As shown in FIG. 4, the filter device 1 is provided with a filter frame upstream of a main unit type filter 3 in which a main filter 2 that is folded in a filter frame 4 and further folded in a W shape is housed. There is a filter 5 in which a pre-unit type filter 7 containing a pre-filter 6 made of a filter material having a lower filtration efficiency than the main filter 2 is arranged.

However, in this filter device 1, it is necessary to secure a large space extending in the depth direction in the filter device 1 in order to arrange the two pre-unit type filters 3 and the main unit type filter 7. was there. Since the pre-unit type filter 3 and the main unit type filter 7 are replaced at different times, the filter unit 1 is designed so that the pre-unit type filter 3 and the main unit type filter 7 can be exchanged independently. It was necessary to provide a mounting structure for each of the pre-unit type filter 3 and the main unit type filter 7.

In order to solve the above problem, the present inventor manufactured a unit type filter using a two-layer structure filter having a dense / dense structure, whereby one unit type filter was replaced with a main unit type filter and a pre-unit type filter. We considered adding both functions of the filter.

However, the filter using the two-layer structure filter has two types of layers having different densities, and the thickness of the filter is increased by the amount of the laminated layers, so that it is difficult to fold the filter at a small pitch. After all, the scale of the unit type filter itself using the two-layer structure filter has become large.

In this unit type filter,
Thickness and density are different between the dense layer side that has the function of the main filter and the coarse layer side that has the function of the pre-filter. Therefore, there is a possibility that the filtration efficiency varies depending on the location, and a portion that is easily clogged may be formed.

Further, in this unit type filter, since the main filter dense layer and the pre-filter coarse layer are laminated and integrated, only the main filter dense layer or only the pre-filter coarse layer cannot be replaced. In addition, the entire unit filter has to be replaced with the replacement time of the pre-filter coarse layer having a short service life.

The present invention has been made in view of such circumstances, and a single unit-type filter has both functions of a pre-filter and a main filter, and can reduce the size of a filter device. It is another object of the present invention to provide a unit type filter in which only the pre-filter can be replaced.

[0009]

In order to achieve the above object, a first aspect of the present invention is a unit type filter having a pre-filter disposed upstream of a folded main filter. On one side of
A strong material is laminated, and the pre-filter is folded along the folded shape of the main filter , is superposed on the main filter, and is provided detachably independently of the main filter. The feature of the unit type filter is as follows.

[0010] The invention of the second aspect has a gist of a unit type filter characterized in that an edge of the prefilter is reinforced with resin.

Hereinafter, the unit type filter of the present invention will be described in more detail with reference to the drawings. As shown in FIGS. 1, 2 and 3, the unit filter 11 of the present invention has a main filter 12 fixed in a filter frame 15 and a pre-filter disposed in the filter frame 15 on the upstream side of the main filter 12 as well. And a filter 13.

The main filter 12 is obtained by increasing the surface area of the filter medium by folding the filter medium made of nonwoven fabric or the like (primary folding) and then further folding it into a W shape (secondary folding). The folded shape of the main filter 12 may be a secondary folding process or may be only a primary folding process depending on the required size of the filter function and the scale of the filter device.

The pre-filter 13 is made of a filter material having a lower filtration efficiency than the main filter 12, and collects coarse dust upstream of the main filter 12. The pre-filter 13 is folded in accordance with the folded shape of the main filter 12 so that the pre-filter 13 can be polymerized without gaps with the main filter 12. For example, when the main filter 12 is folded and folded in a W shape as shown in FIGS. 1 and 3, the folded shape of the pre-filter 13 is a W shape, and the main filter 12 is in a W shape. When only the folding process is performed, the shape becomes the same. If the main filter 12 is only subjected to the fold processing, the pre-filter 13 also has a shape obtained by performing only the fold processing. When the main filter 12 is folded and folded into a W shape, the pre-filter 13 is only folded into the W shape because the folded shape of the pre-filter 13 is sufficient if the main filter 12 can be overlapped with no gap. It may be folded in the same manner as the main filter 12 and folded into a W shape.

The pre-filter 13 is self-supporting, and can be attached and detached independently of the main filter 12 alone. Unit type filter 11 shown in FIGS. 1 and 2
The pre-filter 13 can be inserted into or taken out of a gap 14 formed between the upstream side of the main filter 12 fixed in the filter frame 15 and the filter frame 15.

Since the pre-filter 13 is folded in itself, it is structurally self-supporting, and can prevent deformation due to wind pressure when the unit-type filter 11 is used. In order to obtain sufficient independence (shape retention) to make it detachable ,
The pre-filter 13 is formed by laminating a reinforcing material 16 such as a plastic net or a wire mesh on one surface of the pre-filter 13.
13 is reinforced. Further, a plastic plate may be attached to the edge of the pre-filter 13 or the entire edge may be impregnated with a resin to reinforce the pre-filter 13, so that the pre-filter 13 can be attached to and detached from the unit-type filter 11. Become smoother. The plastic plate may be attached to the pre-filter with an adhesive such as a hot melt resin.However, the plastic plate is covered with a PVC leather or the like to enhance decorativeness, and the PVC leather is sewn to the pre-filter, A plastic plate may be attached to the prefilter.

[0016]

EXAMPLES Example 1 A web composed of acrylic fiber and polyclar fiber having a fineness of 2 denier and a polyvinylidene chloride adhesive bonded to a web having a basis weight of 120 g / m ² and a thickness of 1 mm was melt-blown on a nonwoven fabric having a fiber diameter of 10 μm. The following polypropylene fibers are laminated to produce a nonwoven fabric having a basis weight of 40 g / m ² , a filter medium made of these two nonwoven fabrics is produced, and then the filter medium is subjected to a fold processing as shown in FIG. The main filter 12 was obtained.

On the other hand, a nonwoven fabric having a basis weight of 70 g / m ² and a thickness of 3 mm obtained by bonding a web made of nylon fibers having a fineness of 20 denier with a polyvinyl chloride adhesive is used. The pre-filter 13 was obtained by folding the filter material obtained by thermocompression bonding the arranged polyethylene net 16 and bonding the same to the folded shape of the main filter 12.

The main filter 12 is connected to a filter frame 15
After being adhered and stored in the contact surface with the filter frame 15, the upstream side of the main filter 12 and the filter frame 15
The pre-filter 13 was inserted into the gap 14 provided between the pre-filter 13 and the unit-type filter 11.

Example 2 A unit-type filter was obtained in exactly the same manner as in Example 1 except that an acrylic resin plate having a width of 10 mm was adhered to the peripheral edge of the prefilter 13 of Example 1 with a hot melt resin. . The pre-filter of this unit type filter could be attached and detached more smoothly than that of Example 1.

[0020]

According to the present invention, the above-mentioned structure is provided.
In the unit type filter described ,
A reinforcing material is laminated on one surface, and the pre-filter is folded along the folded shape of the main filter and polymerized on the main filter, and is provided detachably independently of the main filter. Therefore, both functions of the pre-filter and the main filter can be provided by one unit-type filter, and the depth of the filter device to which the unit-type filter is attached can be reduced. Further, since only the pre-filter can be replaced, the main filter can be used up to the service life.

In the unit filter according to the second aspect, since the edge of the prefilter is reinforced with resin, the prefilter is attached to the unit filter.
Removal can be made smoother.

[Brief description of the drawings]

FIG. 1 is an enlarged plan view showing a unit type filter of the present invention.

FIG. 2 is an enlarged front view of the same.

FIG. 3 is an assembly perspective view showing a state where a pre-filter is to be inserted into a gap between an upstream side of a main filter and a filter frame.

FIG. 4 is an enlarged plan view showing a filter device equipped with a conventional unit-type filter.

[Explanation of symbols]

 12: Main filter 13: Pre-filter 14: Gap 15: Filter frame 16: Reinforcing material

Claims (2)

(57) [Scope of request for utility model registration] 1. A unit filter having a pre-filter disposed upstream of a folded main filter, wherein a reinforcing material is laminated on one surface of the pre-filter , and the pre-filter has a folded shape of the main filter. Is folded along and polymerized on the main filter,
A unit type filter which is detachably provided independently of the main filter. 2. The unit-type filter according to claim 1, wherein an edge of said pre-filter is reinforced with a resin.