JP2018001093A - Air filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air filter device capable of exchanging a filter from a downstream side, without being provided with a maintenance space on an upstream side.SOLUTION: An air filter device 100 is equipped with prefilter holding frames 11 and 11' including prefilters 1 and 1'; main filter holding frames 21 and 21' including medium performance filters 2 and 2'; a filter housing 3 which is provided with recessed portions 4 and 4 storing the prefilter holding frames 11 and 11' and the main filter holding frames 21 and 21' in this order on a downstream side, is provided with air inflow ports 5 and 5' on bottom surfaces of the recessed portions, and in which front surfaces of the prefilter holding frames 11 and 11' abut on peripheral edges of the air inflow ports; and a fastener 7 which is provided at outer edge portions of the recessed portions 4 and 4' of the filter housing 3, and presses the prefilter holding frames and the main filter holding frames on edge portions of the bottom surfaces of the recessed portions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air filter device capable of attaching and removing a filter from the downstream side.

  In a general air conditioner, a mounting frame is provided for each filter, and in order to perform maintenance such as filter replacement, it is necessary to perform from the upstream side (air inflow side) of the intake duct. That is, in the normal filter mounting frame, first, the medium performance filter is installed, the holding frame is installed on the upstream front surface, tightened with bolts, and finally the prefilter is installed on the upstream front surface. In this case, performing maintenance from the downstream side (air outflow side) is difficult to perform maintenance from the downstream side because a space for inserting the prefilter cannot be secured.

Therefore, it is necessary to provide a maintenance space on the upstream side. However, the maintenance space on the upstream side is contaminated by the outside air that flows in, so there is a problem in the working environment, and there is a problem that the area where rust and the like are generated increases because a large space is required.
Furthermore, since one mounting frame is required for each filter, when installing filters in multiple rows and multiple stages in general air conditioning with a large air flow rate, it is necessary to perform filter replacement work for each mounting frame. It was complicated.

On the other hand, Patent Document 1 describes a gas turbine intake filter unit in which a primary filter layer, a secondary filter layer, and a tertiary filter layer are sequentially arranged from the upstream side in the intake duct. In this filter unit, it is described that a filter can be exchanged by providing a space between the secondary filter layer and the tertiary filter layer (paragraph [0011]).
However, there is no description about exchanging the filters constituting the primary filter layer and the secondary filter layer from the downstream side in the intake duct.

Patent Document 2 describes an intake filter that includes a pre-filter and a high-performance filter and has a maintenance space between them, and enters the maintenance space to replace the pre-filter. Is described.
However, since a maintenance space is provided between the pre-filter and the high-performance filter, the replacement of the high-performance filter is performed on the upstream side, and problems such as the above-described work environment occur.

Japanese Patent No. 4532224 JP-A-8-257329

  The main subject of this invention is providing the air filter apparatus which can replace the filter from a downstream, without providing a maintenance space in an upstream.

  In the air filter device of the present invention, a filter holding frame incorporating a filter and a concave portion for housing the filter holding frame are provided on the downstream side, and an air inlet is provided on the bottom surface of the concave portion. A filter housing with which the front surface of the filter holding frame abuts, and a clamp provided on an outer edge portion of the concave portion of the filter housing and pressing the filter holding frame against the edge portion of the bottom surface of the concave portion. The concave portion of the filter housing has a size that slidably accommodates the plurality of filter holding frames, and the air inlet and the fastening tool are provided for each filter holding frame accommodated in the concave portion. ing.

According to the present invention, since the filter holding frame is accommodated in the recess provided on the downstream side of the filter housing, the filter holding frame can be replaced from the downstream side, and there is no need to provide a maintenance space on the upstream side, and the cleanliness on the downstream side is clean. Maintenance work such as filter replacement can be performed in a safe environment.
Further, since it is not necessary to provide a maintenance space on the upstream side, the area where rust or the like is generated due to the contaminated outside air flowing in is reduced.
Since the filter holding frame is housed in the recess of the filter housing and only presses against the air inlet peripheral edge of the bottom of the recess with a tightening tool, the filter housing can be thinned, and the space for the air filter device can be saved. Is possible.
The concave portion of the filter housing has a size that slidably accommodates a plurality of filter holding frames, so that even if there are obstacles on the downstream side, these filter holding frames can be moved from any position on the downstream side. It can be accommodated in a filter housing and slid to be installed at a predetermined position. Further, since a plurality of filters can be easily accommodated in the filter housing, it is excellent in workability such as maintenance.

It is a schematic sectional drawing of the air filter apparatus which concerns on one Embodiment of this invention. It is a schematic perspective view which shows the pre filter holding frame and this filter holding frame in this invention. It is the front view which looked at the air filter apparatus shown in FIG. 1 from the upstream (air inflow side). It is the rear view which looked at the air filter apparatus shown in FIG. 1 from the downstream (air outflow side).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An air filter device 100 according to an embodiment of the present invention shown in FIG. 1 includes a pre-filter holding frame 11 and 11 ′ including pre-filters 1 and 1 ′, and a main filter holding including medium-performance filters 2 and 2 ′. The frames 21 and 21 ′ are accommodated in recesses 4 and 4 ′ provided in two upper and lower stages in the filter housing 3, respectively. A high performance filter can be used instead of the medium performance filter.
The pre-filters 1 and 1 ′ mainly collect dust in the air, and the medium-performance filters 2 and 2 ′ and the high-performance filters are located on the downstream side of the pre-filters 1 and 1 ′, and are finer. It collects dust.

  As shown in FIG. 2, the pre-filter holding frames 11 and 11 ′ and the main filter holding frames 21 and 21 ′ are configured by a frame, and there are edges 111, 111 ′, and 211 around the front surface located on the upstream side. , 211 ′ are formed integrally with the frame, and a similar edge is also formed around the back surface located on the downstream side. Sealing gaskets 8 are attached to the front surfaces of the edges 111, 111 ′, 211, 211 ′. The gasket 8 may be attached to the other surface where the front surfaces of the edge portions 111, 111 ′, 211, 211 ′ face each other.

The filter housing 3 is configured by a frame. This frame body is opened on the upstream side (indicated by arrow A in FIG. 1) and downstream side (indicated by arrow B in FIG. 1) of the air, and the above-described two-stage recesses 4, 4 ′ are formed inside. The plate material 6 bent so as to form is fixed in a substantially vertical posture. For example, the outer peripheral portion of the plate member 6 is fixed to the inner surface of the frame body 3 by welding, screwing, or the like.
An attachment hole 10 for attaching the filter housing 3 to another member (not shown) is provided on the front surface of the frame 3.

  The recesses 4, 4 ′ are provided on the downstream side of the air passing through the filter housing 3, and air inlets 5, 5 ′ are provided on the bottom surfaces of the recesses 4, 4 ′. Pre-filter holding frames 11 and 11 ′ and main filter holding frames 21 and 21 ′ are accommodated in the recesses 4 and 4 ′ in this order. The front surfaces of the prefilter holding frames 11 and 11 ′ are in contact with the peripheral edges 51 and 51 ′ of the air inlets 5 and 5 ′ via the gasket 8.

  Fasteners 7 are attached to the outer edge portions (in this embodiment, upper and lower outer edge portions) of the recesses 4 and 4 ′ of the filter housing 3. The fastening tool 7 includes a long bolt 71 inserted through a through hole (not shown) formed in the outer edge portion of the recesses 4 and 4 ′, and a fixing nut 72 screwed into one end of the long bolt 71 upstream from the outer edge portion. And a contact plate 73 inserted through the long bolt 71 on the downstream side, and a tightening nut 74 screwed into the other end of the long bolt 71 via a washer. The fixing nut 72 may be fixed to the outer edge portion by welding or the like, or may not be fixed.

  One end of the contact plate 73 extending in the vertical direction from the long bolt 71 contacts the downstream surface of the filter holding frames 21 and 21 ′. Then, by tightening the tightening nut 74, the filter holding frames 21, 21 'are placed on the back of the pre-filter holding frames 11, 11', and the pre-filter holding frames 11, 11 'are placed on the bottom of the recesses 4, 4'. The formed air inflow ports 5 and 5 ′ can be pressed and fixed to the peripheral edges 51 and 51 ′ via the gasket 8. This prevents air from flowing out downstream from the air inlets 5 and 5 'without passing through the filter. In this embodiment, the fastening tool 7 is attached above and below the recesses 4 and 4 ′.

  As shown in FIG. 3, air inlets 5 and 5 ′ are formed in two vertical rows and three horizontal rows on the front surface of the filter housing 3 facing the upstream side. That is, when the combination of one pre-filter holding frame 11, 11 ′ and one main filter holding frame 21, 21 ′ is one unit 9, 9 ′, the air inlets 5, 5 ′ are provided for each unit 9, 9 ′. 'Is provided.

And as shown in FIG. 4, the recessed parts 4 and 4 'provided in the back surface of the filter housing 3 facing a downstream side have the space which accommodates the three units 9 and 9' so that a slide is possible in a horizontal direction, respectively. Have.
Therefore, even if the holding frames 11, 11 'and the filter holding frames 21, 21' cannot be accommodated in the recesses 4, 4 'because there is an obstacle on the downstream side of the filter housing 3, there is no obstacle. The pre-filter holding frames 11 and 11 ′ and the main filter holding frames 21 and 21 ′ are placed in the recesses 4 and 4 ′ from the portion, and are accommodated in the recesses 4 and 4 ′ at predetermined positions by sliding in the lateral direction. Can do.
The fastening tool 7 is provided for each of the units 9 and 9 ′ accommodated in the recesses 4 and 4 ′.

  Next, a method of mounting the pre-filter holding frames 11 and 11 ′ and the main filter holding frames 21 and 21 ′ on the filter housing 3 will be described. In the following description, a method for mounting the pre-filter holding frame 11 and the main filter holding frame 21 will be described. However, the pre-filter holding frame 11 ′ and the main filter holding frame 21 ′ can be mounted in the same manner.

The filter housing 3 is attached, for example, in an intake duct (not shown) with the recess 4 on the downstream side. First, the pre-filter holding frame 11 is inserted and placed in the recess 4 from the downstream side, and then the present filter holding frame 21 is inserted and placed.
At this time, when there is an obstacle on the downstream side of the filter housing 3, as described above, the holding frames 11 and 21 are inserted into the recesses 4 from the positions where they can be accommodated, and then slid to a predetermined position. .

In this way, after the pre-filter holding frame 11 and the main filter holding frame 21 are accommodated at predetermined positions in the recess 4, one end of the contact plate 73 of the fastening tool 7 is brought into contact with the back surface of the main filter holding frame 21. Then, it is fixed by tightening with a tightening nut 74.
When removing the pre-filter holding frame 11 and the main filter holding frame 21 from the filter housing 3 for maintenance or the like, the reverse operation described above may be performed.

According to the present embodiment, the pre-filter holding frame 11 and the main filter holding frame 21 can be housed and taken out from the downstream side in the concave portion 4 of the filter housing 3, and maintenance such as filter replacement is performed on the upstream side. Since it is not necessary, the maintenance work can be performed in a clean space on the downstream side from which dust is removed through the filters 1 and 2.
In addition, the pre-filter holding frame 11 and the main filter holding frame 21 accommodated in the recess 4 are pressed and fixed by the fastening tool 7, so that no special fixing tool such as a cam crank is required and the filter can be easily replaced. In addition, the filter housing 3 can be reduced in thickness, and the space of the air filter device can be saved.

  In the present invention, the pre-filter holding frame 11 and the main filter holding frame 21 are separately accommodated in the recess 4 of the filter housing 3, but the two holding frames 11 and 21 integrated in advance are accommodated in the recess 4. The fastening tool 7 may be used for tightening. Moreover, you may use what attached the pre filter 1, 1 'and the medium performance filter 2, 2' in one holding frame.

  Further, the tightening tool is not limited to the above-described embodiment, and various other than the above can be employed.

  Furthermore, in this embodiment, the air inlets 5 and 5 'are formed in the filter housing 3 in two vertical rows and three horizontal rows, but the present invention is not limited to this, and the air inlets 5 and 5' are formed in two or more rows. The number of stages may be one or two or more.

DESCRIPTION OF SYMBOLS 1, 1 'Pre filter 2, 2' Medium performance filter 3 Filter housing 4, 4 'Recess 5, 5' Air inlet 6 Plate material 7 Fastening tool 8 Gasket 9, 9 'Unit 10 Mounting hole 11, 11' Pre filter holding Frame 21, 21 'This filter holding frame 51, 51' Perimeter 71 Long bolt 72 Fixing nut 73 Contact plate 74 Tightening nut

Claims (3)

A filter holding frame with a built-in filter;
A filter housing in which a concave portion for accommodating the filter holding frame is provided on the downstream side, an air inlet is provided on a bottom surface of the concave portion, and a front surface of the filter holding frame is in contact with a peripheral edge of the air inlet;
A clamp that is provided at an outer edge of the recess of the filter housing and presses the filter holding frame against the edge of the bottom of the recess;
The concave portion of the filter housing has a width for slidably accommodating the plurality of filter holding frames,
An air filter device in which the air inflow port and the fastening tool are provided for each filter holding frame accommodated in the recess.   The filter holding frame includes a pre-filter holding frame containing a pre-filter and a main filter holding frame containing a medium performance filter or a high-performance filter, and the pre-filter holding frame and the main filter holding frame in the recess. The air filter device according to claim 1, wherein the air filter device is housed in this order.   Claims in which gaskets are interposed between the peripheral edge of the air inlet and the front surface of the pre-filter holding frame in contact with the peripheral edge, and between the back surface of the pre-filter holding frame and the main filter holding frame. Item 3. The air filter device according to Item 1 or 2.

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