Filter unit

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

Technical Field

[0001] The present invention relates to a filter unit for preventing the intrusion of foreign matters such as insects and dust.

Background Art

[0002] Generally, in air conditioning equipment, ventilation equipment, or smoke exhaust equipment, etc., a duct is used to supply and exhaust air. Since the duct connects the inside and the outside of the room, foreign matters such as insects and dust may enter the room from the outside through the duct.

[0003] Conventionally, a technique of attaching a filter to the air supply and exhaust ports of an air conditioner so as to prevent the intrusion of insects 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, by using a magnet, the replacement and maintenance of the net filter are facilitated, and it can be repeatedly used, which is economically advantageous.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In order to collect minute foreign matters such as insects and dust, a filter with a small mesh size must be used. A filter with a small mesh size has a large pressure loss, leading to an increase in power consumption and cost.

[0006] In addition, the net filter described in Patent Document 1 has a flat portion for collecting the intruding foreign matter. When foreign matter is collected on such a flat portion, the flat portion is gradually covered with the collected foreign matter, and the area for allowing air to pass through decreases. Therefore, frequent maintenance is required. However, filters for preventing the intrusion of foreign matter are often installed in locations where removal and installation are difficult. Therefore, during maintenance, the filter may be deformed, or gaps may occur during installation, resulting in a reduced effect of preventing the intrusion of foreign matter.

[0007] An object of the present invention is to provide a filter unit that has an effect of preventing the intrusion of foreign matter over a long period and can be easily attached and maintained.

Means for Solving the Problems

[0008] The filter unit according to the present invention includes a filter body having an opening that opens in one direction and a closed back portion on the side opposite to the opening, and the filter body has a concave shape as a whole, and an installation portion having a frame portion for attaching the opening. The opening area of the back portion parallel to the surface formed by the frame portion is formed to be smaller than the opening area of the opening attached to the frame portion.

Effects of the Invention

[0009] The filter unit according to the present invention has an opening that opens in one direction and a closed back portion on the side opposite to the opening, and the filter body has a concave shape as a whole, and an installation portion having a frame portion for attaching the opening. It is provided with The opening area of the back portion parallel to the surface formed by the frame portion is formed to be smaller than the opening area of the opening attached to the frame portion. The frame portion is formed in an annular shape of a tubular shape to be attached a member and having the same diameter as the opening of the filter body and has a cut portion that is cut in part. ​ It has a biasing force that tends to expand outward. This is the gist of the invention.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0011] Hereinafter, a filter unit 1 according to an embodiment of the present invention will be described with reference to the drawings.

[0012] FIG. 1 shows an example of the filter unit 1 of the first embodiment.

[0013] The filter unit 1 of the first embodiment includes a filter body 2 that prevents the intrusion of foreign matters such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

[0014] The filter body 2 has a function of allowing air to pass through and preventing the intrusion of foreign matters such as insects and dust. The filter body 2 of the first embodiment is configured in a mesh shape such as a net. The filter body 2 is not limited to a net, and may be a non-woven fabric or the like. The filter body 2 has an opening 2a that opens in one direction and a closed inner portion 2b on the side opposite to the opening 2a, and has a concave shape as a whole. The shape of the opening 2a may be adapted to the shape of the installation portion 3.

[0015] Note that the filter body 2 may be concave as a whole before installation, or may become concave when the inner part 2b is pushed by the airflow.

[0016] The installation part 3 has a frame part 31 adapted to the cross-sectional shape of the flow path such as a duct to be installed, and a fixing part 32 that contacts the flow path to fix the frame part 31. The frame part 31 is formed into the inner peripheral shape of the flow path such as an annular shape or a rectangular shape using a rod-shaped or tubular member. The frame part 31 of the first embodiment is formed in a rectangular shape.

[0017] The fixing part 32 contacts the flow path so that the frame part 31 does not move relative to the flow path. The fixing part 32 of the first embodiment extends from at least a part of the frame part 31 toward the filter body 2 and has a biasing force in a direction away from the filter body 2.

[0018] The opening 2a of the filter body 2 is attached to the frame part 31. The filter body 2 is formed such that the opening area of the inner part 2b parallel to the surface formed by the frame part 31 is smaller than the opening area of the opening 2a attached to the frame part 31. Hereinafter, the "opening area in the cross-section parallel to the surface formed by the frame part 31" is simply referred to as the "opening area".

[0019] The filter body 2 of the first embodiment is formed such that the opening area gradually decreases from the opening 2a toward the inner part 2b. Note that even if the opening area increases or decreases from the opening 2a to the inner part 2b, it is only necessary that the inner part 2b is finally smaller than the opening 2a. Note that there may be a plurality of inner parts 2b, and in the case of a plurality, the opening areas may be added together.

[0020] FIG. 2 shows a cross-section of the filter unit 1 of the first embodiment attached to the tubular member 4.

[0021] The filter unit 1 of the first embodiment is attached to the inner circumference of a tubular member 4 having a square cross-section. When attaching, the fixing portion 32 is folded toward the filter body 2 side and inserted into the inside of the tubular member 4. The filter body 2 is installed on the inner circumference of the tubular member 4 such that the outer circumference of the frame portion 31 contacts with almost no gap. In the state where the filter body 2 is installed on the tubular member 4, the fixing portion 32 presses the tubular member 4 by an urging force. Therefore, the filter unit 1 always applies an urging force to the tubular member 4 and is firmly installed, so that it hardly moves even in a strong air flow.

[0022] FIG. 3 shows an example of the filter unit 1 of the second embodiment.

[0023] The filter unit 1 of the second embodiment includes a filter body 2 that prevents the intrusion of foreign matters such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

[0024] 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 fixing portion 32 of the second embodiment is a magnet attached along at least a part of the frame portion 31.

[0025] The configuration of the other filter body 2 is the same as that of the first embodiment.

[0026] FIG. 4 shows a cross-section of the filter unit 1 of the second embodiment attached to the tubular member 4.

[0027] The filter unit 1 of the second embodiment is attached to the inner circumference of a metal tubular member 4 having an annular cross-section. When attaching, the fixing portion 32 of the magnet is inserted into the inside of the metal tubular member 4. The filter body 2 is installed on the inner circumference of the tubular member 4 such that the outer circumference of the frame portion 31 contacts with almost no gap. In the state where the filter body 2 is installed on the tubular member 4, the fixing portion 32 is adhered to the tubular member 4 by magnetic force. Therefore, the filter unit 1 is always adhered to the tubular member 4 by magnetic force and is firmly installed, so that it hardly moves even in a strong air flow.

[0028] FIG. 5 shows an example of the filter unit 1 according to the third embodiment.

[0029] The filter unit 1 according to the third embodiment includes a filter body 2 that prevents the intrusion of foreign matters such as insects and dust, and an installation portion 3 that installs the filter body 2 in a flow path such as a duct.

[0030] The frame portion 31 according to the third embodiment is formed in an annular shape, but has a cut portion 31a that is partially cut. Further, the frame portion 31 has a biasing force that tends to expand toward the outer peripheral side. Therefore, the frame portion 31 alone will expand from the cut portion 31a.

[0031] In the third embodiment, the opening 2a of the filter body 2 and the frame portion 31 are attached in an annular shape having the same diameter as the diameter of the tubular member to be attached. Therefore, the diameter of the frame portion 31 in the state of being attached to the opening 2a of the filter body 2 is the same as or substantially the same as the diameter before cutting.

[0032] The configuration of the other filter body 2 is the same as that of the first and second embodiments. In the filter unit 1 according to the third embodiment, the frame portion 31 constitutes the stopper portion 32.

[0033] FIG. 6 shows a cross section of the filter unit 1 according to the third embodiment attached to the tubular member 4.

[0034] The filter unit 1 according to the third embodiment is attached to the inner circumference of a tubular member 4 such as a spiral tube having an annular cross section. At the time of attachment, both ends are overlapped from the cut portion 31a so that the diameter of the frame portion 31 becomes smaller, and it is inserted into the inner circumference of the tubular member 4. The filter body 2 is installed so that the outer circumference of the frame portion 31 is in almost contact with the inner circumference of the tubular member 4 without a gap. In the state where the filter body 2 is installed in the tubular member 4, the frame portion 31 having the function of the stopper portion 32 has a biasing force applied to the outer peripheral side. Therefore, the filter unit 1 always presses the tubular member 4 with a biasing force and is firmly installed, so that it hardly moves even in a strong air flow.

[0035] In the filter unit 1 of this embodiment, a frame portion 31 is installed on the upstream side with respect to the air flow A, and the filter main body 2 is installed on the downstream side. Therefore, foreign matters such as insects that have invaded from the outside are collected in the inner part 2b of the filter main body 2.

[0036] In order to collect minute foreign matters such as insects and dust, a filter with a small mesh size must be used. A filter with a small mesh size has a large pressure loss, leading to an increase in power consumption and cost.

[0037] Also, in the filter of the prior art described in Patent Document 1, the collection portion corresponding to the inner part 2b of this embodiment was flat. Therefore, the collected foreign matters fill the plane. Then, the gaps of the filter gradually become smaller, and the ventilation volume decreases.

[0038] In the filter unit 1 of this embodiment, foreign matters such as insects are collected in the inner part 2b. Since the filter main body 2 is three-dimensional, the surface area of the filter main body 2 is larger than the flat surface of the filter of the prior art described in Patent Document 1. Therefore, the filter unit 1 of this embodiment can suppress a decrease in the ventilation volume and has a small pressure loss even if it is a filter with a small mesh size. Therefore, the filter unit 1 of this embodiment has the effect of preventing the intrusion of foreign matters over a long period of time and can reduce the frequency of maintenance.

[0039] Also, the filter unit 1 of this embodiment has a structure that can be attached and detached to the inner periphery of the tubular member 4 without interfering with existing equipment, and can be easily maintained.

[0040] As described above, the filter unit 1 of the present embodiment includes a filter body 2 having an opening 2a that opens in one direction and a closed inner part 2b on the side opposite to the opening 2a, and the filter body 2 has a concave shape as a whole, and an installation part 3 having a frame part 31 for attaching the opening 2a. The opening area of the inner part 2b parallel to the surface formed by the frame part 31 is formed to be smaller than the opening area of the opening 2a attached to the frame part 31. Therefore, it is possible to suppress a decrease in the ventilation volume, and there is an effect of preventing the intrusion of foreign matter over a long period of time, and maintenance can be easily performed.

[0041] Further, in the filter unit 1 of the present embodiment, the installation part 3 has a fixing part 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 with a small space without interfering with existing equipment.

[0042] Further, in the filter unit 1 of the present embodiment, the fixing part 32 extends from at least a part of the frame part 31 toward the filter body 2 side and has a biasing force in a direction away from the filter body 2. Therefore, it has a structure that can be easily attached to and detached from the tubular member 4, and maintenance can be easily performed.

[0043] Further, in the filter unit 1 of the present embodiment, the fixing part 32 is a magnet attached to at least a part of the frame part 31. Therefore, it has a structure that can be easily attached to and detached from the tubular member 4, and maintenance can be easily performed.

[0044] Further, in the filter unit 1 of the present embodiment, the frame part 31 has a biasing force that tends to expand toward the outer peripheral side. Therefore, it has a structure that can be easily attached to and detached from the tubular member 4, and maintenance can be easily performed.

[0045] Note that the present invention is not limited by this embodiment. That is, in the description of the embodiment, a lot of specific detailed content is included for the purpose of illustration, but those skilled in the art may make various variations and changes to these detailed contents.

Description of Symbols

[0046] 1…Filter unit 2…Filter body 2a…Opening 2b…Inner part 3…Installation part 31…Frame part 32…Stopping part 4…Tubular member

Claims

1. A filter body having an opening that opens in one direction and a closed back portion on the side opposite to the opening, and being concave as a whole, and An installation portion having a frame portion for attaching the opening, Comprising, The opening area of the back portion parallel to the surface formed by the frame portion is formed to be smaller than the opening area of the opening attached to the frame portion, The frame portion Is formed in an annular shape with the same diameter as the tubular member to be attached and the opening of the filter body, Has a cut portion that is cut in part, Has a biasing force that tends to expand to the outer peripheral side, A filter unit characterized by this.

2. The installation portion has an annular cross-section and is attached to the inner circumference of a tubular member having irregularities formed in the axial direction, The filter unit according to claim 1, characterized by this.

3. The installation portion When installing, starting from the cut portion, both ends are overlapped so that the diameter of the frame portion becomes smaller, and it is inserted into the inner circumference of the tubular member, The outer circumference of the frame portion is installed so as to contact the concave portion of the inner circumference of the tubular member, Due to the biasing force of the frame portion toward the outer peripheral side, the outer circumference of the frame portion always presses the tubular member with the biasing force, The filter unit according to claim 2, characterized by this.

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