air filter

Abstract

An air filter in which the entire outer circumference of the filter material is surrounded by a box-shaped filter frame, wherein perforations formed along the outer circumference of the air outlet surface and air inlet surface of the filter frame are made so that the filter material can be neatly and easily cut along the perforations. [Solution] An air filter in which the entire outer circumference of a filter material 40 is surrounded by a box-shaped filter frame 10, wherein a strip 30 for cutting is formed along the outer circumference of the air outlet surface 11b and the air inlet surface 11a of the filter frame 10 with perforations 20a, 20b, and the air outlet surface 11b and the air inlet surface 11a are exposed by cutting off this strip 30.

Description

Technical Field

[0001] The present invention relates to an air filter used in an air purifying device. In particular, it relates to an air filter with a filter frame that is optimal for air conditioners such as ceiling-embedded ducts used in the individual decentralized system in building air conditioning, and is easy to handle without damage or contamination of the filter filter medium even in simple packaging.

Background Art

[0002] Regarding an air filter with a filter frame that is easy to handle without damage or contamination of the filter filter medium even in simple packaging, for example, as disclosed in Japanese Utility Model Laid-Open No. 4-33918 (Patent Document 1), in an air filter in which a pleated filter medium is housed inside a packaging box body assembled with paper or the like, two surfaces of the packaging box body corresponding to the upstream side and the downstream side of the filter medium with respect to the fluid to be filtered are easily opened, and an air filter provided with perforations so that an opening surface of the air filter can be obtained has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although the conventional air filter is easy to handle without damage or contamination of the filter filter medium, there is a disadvantage that in the opening operation along the perforations, the perforations are opened in an unintended direction and the packaging box is broken, and an opening surface with a clean outer periphery as designed cannot be obtained. Therefore, there has been a demand for an air filter that can be cleanly opened along the above-mentioned perforations in an air filter housed inside a packaging box body assembled with paper or the like for such a filter medium.

Means for Solving the Problems

[0005] Therefore, after diligent research by the inventors, we have found that the above problem can be solved by replacing the conventional linear perforations with perforations on the strip for tearing. The air filter of the present invention is based on the above findings and is as follows: (1) An air filter in which the entire outer circumference of the filter material is surrounded by a box-shaped filter frame, wherein a strip for cutting is formed by perforations along the outer circumference of the air outlet surface and the air inlet surface of the filter frame, and the air outlet surface and air inlet surface are exposed by cutting off this strip. (2) The air filter according to (1), wherein the corner portion of the strip is rounded. (3) The perforations are of the V-shape type, as described in (1) or (2). (4) The air filter according to (3), wherein the notches in the strip formed by the V-shaped perforations narrow in the direction in which the strip is peeled off. (5) The air filter according to (3) or (4), wherein the corners of the strip are rounded and the perforations are straight at the corners. (6) An air filter according to any one of (1) to (5), wherein finger insertion holes are provided at symmetrical positions on the left and right sides of the band, and a cutting line is provided near the insertion holes along the width direction of the band, so as to divide the total length of the band in the length direction into two. (7) An air filter according to any one of (1) to (6), wherein the filter frame is fitted into an inner box with an outer lid. [Effects of the Invention]

[0006] The air filter of the present invention, instead of using straight perforations, has perforated strips along the outer circumferences of the air outlet and air inlet surfaces of the filter frame. By cutting these strips, the air outlet and air inlet surfaces are revealed. As a result, the strips are neatly cut along the perforations, allowing the air outlet and air inlet surfaces to be formed on the filter frame as designed. Furthermore, compared to straight perforations, which require force to tear off the entire area inside the perforations, the cutting process is extremely easy as only the strip needs to be separated. If a radius is formed at the corner of the strip, cutting work at the corner can be easily performed. In particular, if the perforations are made straight at the corners, cutting at the corners can be easily done. Furthermore, if the perforated surface is of the V-shape type, the perforations will be cut along the V-shape, preventing accidental cutting of the outside of the strip, i.e., the filter frame side. Furthermore, if the notches in the strip formed by the aforementioned angled perforations are made to narrow in the direction in which the strip is peeled off, it becomes less likely that the outer part of the strip, i.e., the filter frame side, will be accidentally cut off. Furthermore, if finger holes are provided symmetrically on both sides of the band, and a cutting line is provided near these holes along the width direction of the band, thereby dividing the total length of the band in half, the band will not become too long, and the cutting process will be easier. Furthermore, if the filter frame is constructed as a box-type structure with an outer lid covering an inner box, the box-shaped filter frame can be easily manufactured, the box can be easily opened and closed, and the filter media can be easily maintained. The air filter of the present invention is suitable for use, for example, as a medium-efficiency air filter or a chemical filter. [Brief explanation of the drawing]

[0007] [Figure 1] Perspective view of the air filter of the present invention [Figure 2] Front view of the air filter of the present invention [Figure 3]Front view of the air filter of the present invention with the cover removed. [Modes for carrying out the invention]

[0008] An embodiment of the air filter according to the present invention will be described with reference to the drawings. Figure 1 shows a perspective view of the air filter of the present invention, Figure 2 shows a front view of the same air filter, and Figure 3 shows a front view of the air filter of the present invention with the cover removed.

[0009] In the figure, 1 shows a box-shaped filter frame 10 made of strong paper, such as corrugated cardboard. In this embodiment, it is configured as a box structure where an outer lid 10b is placed over an inner box 10a. The inner box 10a is provided with an air inlet surface (not shown), and the outer lid 10b is provided with an air outlet surface 11b. Furthermore, by forming two parallel perforations 20a and 20b along the outer circumference of the roughly square-shaped air outlet surface 11b of the outer cover 10b, a strip 30 for tearing is formed between these perforations 20a and 20b. The cover 10c is formed inside perforation 20a, and the filter frame 10 is formed outside perforation 20b. The cover 10c can be removed by cutting along the perforations of the strip 30, revealing the air outlet surface 11b. In the figure, 40 indicates the filter material of the air outlet surface 11b. The filter material 40 is composed of, for example, organic fibers, glass fibers, nanofibers, etc.

[0010] The four corners 30a of the strip 30 are rounded to prevent the filter frame 10 from being torn by unintended cutting when the strip 30 is cut, thereby facilitating the cutting work at the corners 30a. Furthermore, the perforations 20a and 20b are formed as straight perforations at the corner portion 30a, making it easier to cut the product at the corner portion 30a. Outside the corner portion 30, the perforations 20a and 20b are in the shape of a reversed "Z". The notch 30b of the strip 30 formed by these reversed "Z"-shaped perforations 20a and 20b is formed so as to narrow in the peeling direction of the strip 30. Therefore, when the strip 30 is cut along the perforations 20a and 20b, the force applied to the perforations is less likely to reach the filter frame 10 formed on the outside of the strip 30.

[0011] Finger insertion holes 30c and 30c are provided at symmetrical positions on the left and right of the strip 30, and cutting lines 30d and 30d along the width direction of the strip 30 are provided in the vicinity of these insertion holes 30c and 30c, so as to bisect the entire length of the strip 30 in the longitudinal direction. For this reason, the strip 30 does not become too long, and the cutting operation of the strip 30 is easy. Also, by inserting fingers into the finger insertion holes 30c and 30c, the start of cutting the strip 30 becomes easy.

Industrial Applicability

[0012] It is possible to form an air outflow surface and an air inflow surface as designed on the filter frame provided with perforations, and the cutting operation of the strip can also be performed very easily, so it is industrially useful.

Explanation of Reference Numerals

[0013] 10 Filter frame 10a Inner box 10b Outer lid 10c Cover 11a Air inflow surface 11b Air outflow surface 20a Perforation 20b Perforation 30 Strip 30a Corner portion 30b Notch 30c Insertion hole 30d Cutting line 40 Filter medium

Claims

1. An air filter in which the entire outer circumference of the filter material is surrounded by a box-shaped filter frame, wherein a strip for cutting is formed along the outer circumference of the air outlet surface and the air inlet surface of the filter frame with perforations, and the air outlet surface and air inlet surface are exposed by cutting off this strip.

2. The air filter according to claim 1, wherein a radius is formed at the corner portion of the strip body.

3. The air filter according to claim 1, wherein the perforations are of the V-shape type.

4. The air filter according to claim 3, wherein the notches in the strip formed by the aforementioned V-shaped perforations narrow in the direction in which the strip is peeled off.

5. The air filter according to claim 3 or 4, wherein the corner portion of the strip is rounded, and the perforations are straight at the corner portion.

6. An air filter according to any one of claims 1 to 4, wherein finger insertion holes are provided at symmetrical positions on the left and right sides of the band, and a cutting line is provided near the insertion holes along the width direction of the band, thereby dividing the total length of the band in the length direction into two.

7. The air filter according to any one of claims 1 to 4, wherein the filter frame is a box structure in which an outer lid is placed over an inner box.

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