JP2022156673A - filter unit - Google Patents

Abstract

To provide a filter unit that has an effect of preventing the entry of foreign substances for a long period, and can be easily attached and maintained.SOLUTION: A filter unit 1 includes a filter body 2 that has an opening portion 2a opened in one direction and a deep portion 2b closed on the opposite side to the opening portion 2a, and has a recessed form as a whole, and an installing portion 3 that has a frame portion 31 attached with the opening portion 2a. With respect to an opening area of the opening portion 2a attached to the frame portion 31, an opening area of the deep portion 2b in parallel with a surface formed by the frame portion 31 becomes small.SELECTED DRAWING: Figure 1

Description

The present invention relates to a filter unit that prevents entry of foreign matter such as insects and dust.

Ducts are generally used to supply and exhaust air in air conditioning equipment, ventilation equipment, smoke exhaust equipment, and the like. Since the duct connects the indoor space with the outdoor space, foreign substances such as insects and dust may enter the indoor space through the duct.

Conventionally, a technique of attaching a filter to an air supply/exhaust port of an air conditioner to prevent insects from entering has been disclosed (Patent Document 1). The net filter described in Patent Document 1 has a mesh bag having a magnet at the end of the net filter body. In this way, the use of magnets facilitates replacement and maintenance of the net filter, and is economically advantageous because it can be used repeatedly.

Utility Model Registration No. 3221683

A filter with a small opening must be used to collect foreign matter such as microscopic insects and dust. A filter with a small opening has a large pressure loss, resulting in an increase in power consumption and cost.

In addition, the net filter described in Patent Literature 1 has a planar portion that collects intruded foreign matter. When foreign matter is collected on such a planar portion, the planar portion is gradually covered with the collected foreign matter, and the area through which air passes is reduced. Therefore, frequent maintenance is required, and many of the filters that prevent foreign matter from entering are installed in places where it is difficult to remove and attach them. Therefore, the filter may be deformed during maintenance, or a gap may be formed during installation, and the effect of preventing foreign matter from entering has diminished.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter unit that has the effect of preventing the intrusion of foreign matter over a long period of time and that can be easily installed and maintained.

A filter unit according to the present invention has an opening that opens in one direction and a closed inner part on the opposite side of the opening, and has a concave filter body as a whole, and a frame that attaches the opening. and an installation portion having a smaller opening area of the back portion parallel to the plane formed by the frame portion than the opening area of the opening attached to the frame portion. It is characterized by

The filter unit according to the present invention has the effect of preventing foreign matter from entering for a long period of time, and can be easily installed and maintained.

An example of the filter unit of 1st Embodiment is shown. Figure 2 shows a cross-section of the filter unit of the first embodiment attached to a tubular member; An example of the filter unit of 2nd Embodiment is shown. Fig. 3 shows a cross-section of the filter unit of the second embodiment attached to a tubular member; An example of the filter unit of 3rd Embodiment is shown. Fig. 4 shows a cross-section of the filter unit of the third embodiment attached to a tubular member;

A filter unit 1 according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the filter unit 1 of the first embodiment.

The filter unit 1 of the first embodiment includes a filter body 2 that prevents entry of foreign matter such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

The filter main body 2 has a function of allowing air to pass through and preventing foreign matter such as insects and dust from entering. The filter main body 2 of the first embodiment is configured in a mesh shape such as a net. The filter main body 2 is not limited to the net, and may be a non-woven fabric or the like. The filter body 2 has an opening 2a opened in one direction and a closed inner part 2b opposite to the opening 2a, and has a concave shape as a whole. The shape of the opening 2 a may be matched with the shape of the installation portion 3 .

The filter main body 2 may have a concave shape as a whole before installation, or may have a concave shape when the inner part 2b is pushed by the air current.

The installation portion 3 has a frame portion 31 that conforms to the cross-sectional shape of a channel such as a duct to be installed, and a stop portion 32 that contacts the channel and stops the frame portion 31 . The frame part 31 is formed in the inner peripheral shape of the flow path such as an annular shape or a rectangular shape using a rod-like or tubular member. The frame portion 31 of the first embodiment is formed in a square shape.

The stop 32 contacts the channel to prevent the frame 31 from moving relative to the channel. The stop portion 32 of the first embodiment extends from at least a portion of the frame portion 31 toward the filter body 2 and has a biasing force in a direction away from the filter body 2 .

The opening 2 a of the filter body 2 is attached to the frame 31 . The filter main body 2 is formed so that the opening area of the inner part 2b parallel to the plane formed by the frame part 31 is smaller than the opening area of the opening part 2a attached to the frame part 31 . Hereinafter, "the opening area in the cross section parallel to the plane formed by the frame portion 31" is simply referred to as the "opening area".

The filter main body 2 of the first embodiment is formed such that the opening area gradually decreases from the opening 2a toward the deep portion 2b. Even if the opening area increases or decreases from the opening 2a to the back 2b, it is sufficient that the back 2b is finally smaller than the opening 2a. It should be noted that there may be a plurality of back portions 2b, and if there are a plurality of opening areas, the respective opening areas should be added.

FIG. 2 shows a cross section of the filter unit 1 of the first embodiment attached to the tubular member 4 .

The filter unit 1 of the first embodiment is attached to the inner periphery of a tubular member 4 having a square cross section. At the time of attachment, the stop portion 32 is folded toward the filter body 2 and inserted into the tubular member 4 . The filter body 2 is installed so that the outer periphery of the frame portion 31 contacts the inner periphery of the tubular member 4 with almost no gap. With the filter main body 2 installed on the tubular member 4 , the stop portion 32 presses the tubular member 4 with an urging force. Therefore, since the filter unit 1 always applies a biasing force to the tubular member 4 and is firmly installed, it hardly moves even with a strong air current.

FIG. 3 shows an example of the filter unit 1 of the second embodiment.

A filter unit 1 of the second embodiment includes a filter body 2 that prevents entry of foreign matter such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

The frame portion 31 of the second embodiment is formed in an annular shape. Therefore, the opening 2a of the filter body 2 is circular. The stop portion 32 of the second embodiment is a magnet attached along at least a portion of the frame portion 31 .

Other configurations of the filter body 2 are the same as those of the first embodiment.

FIG. 4 shows a cross section of the filter unit 1 of the second embodiment attached to the tubular member 4 .

The filter unit 1 of the second embodiment is attached to the inner periphery of a metal tubular member 4 having an annular cross section. During installation, the magnet stop 32 is inserted inside the metal tubular member 4 . The filter body 2 is installed so that the outer periphery of the frame portion 31 contacts the inner periphery of the tubular member 4 with almost no gap. With the filter body 2 installed on the tubular member 4 , the stopper 32 is adhered to the tubular member 4 by magnetic force. Therefore, since the filter unit 1 is always adhered to the tubular member 4 by magnetic force and firmly installed, it hardly moves even with a strong air current.

FIG. 5 shows an example of the filter unit 1 of the third embodiment.

The filter unit 1 of the third embodiment includes a filter body 2 that prevents entry of foreign matter such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

The frame portion 31 of the third embodiment is formed in an annular shape, but has a cut portion 31a that is partially cut. In addition, the frame portion 31 has an urging force that tends to expand toward the outer periphery. Therefore, the frame portion 31 by itself expands from the cut portion 31a.

In the third embodiment, the opening 2a of the filter body 2 and the frame 31 are attached in an annular shape having the same diameter as the tubular member to which they are attached. Therefore, the diameter of the frame 31 attached to the opening 2a of the filter body 2 is the same or substantially the same as the diameter before cutting.

Other configurations of the filter body 2 are the same as those of the first and second embodiments. In addition, in the filter unit 1 of the third embodiment, the frame portion 31 constitutes the stopper portion 32 .

FIG. 6 shows a cross section of the filter unit 1 of the third embodiment attached to the tubular member 4 .

The filter unit 1 of the third embodiment is attached to the inner periphery of a tubular member 4 such as a spiral tube having an annular cross section. At the time of attachment, both end portions are overlapped from the cut portion 31a so that the diameter of the frame portion 31 becomes small, and the frame portion 31 is inserted into the inner circumference of the tubular member 4. As shown in FIG. The filter body 2 is installed so that the outer periphery of the frame portion 31 contacts the inner periphery of the tubular member 4 with almost no gap. In a state in which the filter body 2 is installed on the tubular member 4, the frame portion 31 having the function of the stopper portion 32 is applied with an urging force on the outer peripheral side. Therefore, since the filter unit 1 always presses the tubular member 4 with an urging force and is firmly installed, it hardly moves even with a strong air current.

In the filter unit 1 of this embodiment, the frame portion 31 is installed on the upstream side with respect to the airflow A, and the filter main body 2 is installed on the downstream side. Therefore, foreign matter such as insects entering from the outside is collected in the inner portion 2b of the filter body 2. As shown in FIG.

A filter with a small opening must be used to collect foreign matter such as microscopic insects and dust. A filter with a small opening has a large pressure loss, resulting in an increase in power consumption and cost.

Further, in the prior art filter described in Patent Document 1, the trapping portion corresponding to the deep portion 2b of the present embodiment is flat. Therefore, the collected foreign matter fills the flat surface. As a result, the gap between the filters gradually becomes smaller, resulting in a decrease in the amount of ventilation.

In the filter unit 1 of this embodiment, foreign substances such as insects are collected in the deep portion 2b. Since the filter body 2 is three-dimensional, the surface area of the filter body 2 is large compared to the plane surface of the prior art filter described in Patent Document 1. Therefore, the filter unit 1 of the present embodiment can suppress a decrease in the ventilation amount even if the filter has a small opening, and the pressure loss is small. Therefore, the filter unit 1 of the present embodiment has the effect of preventing foreign matter from entering for a long period of time, and can reduce the frequency of maintenance.

Moreover, the filter unit 1 of this embodiment has a structure that can be attached to and detached from the inner periphery of the tubular member 4 without interfering with existing equipment, and can be easily maintained.

As described above, the filter unit 1 of the present embodiment has an opening 2a that opens in one direction and a closed inner part 2b that is opposite to the opening 2a, and has a generally concave filter body 2, and an opening and an installation portion 3 having a frame portion 31 for mounting the portion 2a, wherein the opening area of the back portion 2b parallel to the plane formed by the frame portion 31 is larger than the opening area of the opening portion 2a attached to the frame portion 31. is formed so that Therefore, it is possible to suppress a decrease in the amount of ventilation, and it is effective in preventing foreign matter from entering for a long period of time, and maintenance can be easily performed.

In addition, in the filter unit 1 of the present embodiment, the installation portion 3 has a stop portion 32 for installing the filter body 2 on the inner circumference of the tubular member 4 . Therefore, it can be easily attached to the tubular member 4 in a space-saving manner without interfering with existing equipment.

Further, in the filter unit 1 of the present embodiment, the stop portion 32 extends from at least a portion of the frame portion 31 toward the filter body 2 side and has a biasing force in a direction away from the filter body 2 . Therefore, it is a structure that can be easily attached to and detached from the tubular member 4, and can be easily maintained.

Moreover, in the filter unit 1 of the present embodiment, the stopper 32 is a magnet attached to at least a portion of the frame 31 . Therefore, it is a structure that can be easily attached to and detached from the tubular member 4, and can be easily maintained.

In addition, in the filter unit 1 of the present embodiment, the frame portion 31 has an urging force that tends to expand toward the outer periphery. Therefore, it is a structure that can be easily attached to and detached from the tubular member 4, and can be easily maintained.

It should be noted that the present invention is not limited by this embodiment. That is, in describing the embodiments, many specific details are included for the purposes of illustration, but those skilled in the art may make many variations and modifications to these details.

DESCRIPTION OF SYMBOLS 1... Filter unit 2... Filter body 2a... Opening part 2b... Deep part 3... Installation part 31... Frame part 32... Stopping part 4... Tubular member

Claims (5)

a generally concave filter body having an opening that opens in one direction and a closed inner part on the opposite side of the opening;
an installation portion having a frame for attaching the opening;
with
The filter unit is formed so that an opening area of the inner part parallel to a plane formed by the frame part is smaller than an opening area of the opening attached to the frame part. 2. The filter unit according to claim 1, wherein the installation portion has a stop portion for installing the filter body on the inner circumference of the tubular member. 3. The filter unit according to claim 2, wherein the stopper extends from at least a portion of the frame toward the filter body and has a biasing force in a direction away from the filter body. 3. The filter unit according to claim 2, wherein the stopper is a magnet attached to at least a part of the frame. 3. The filter unit according to claim 2, wherein the frame has an urging force that tends to spread outward.

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