JPH08155238A - Air filter - Google Patents

Abstract

PURPOSE: To facilitate exchanging of a filter material, to make reuse of frames possible and to decrease and recycle the waste by providing respectively a projected part on either one of the inner peripheral face of the side plate of an upper frame or the outer peripheral face of the side plate of a lower frame and a recessed part or a hole on another one and hooking the projected part with the recessed part or the hole. CONSTITUTION: A projected part 3e is provided on either one of the inner peripheral face of the side plate 3a of an upper frame 3 or the outer peripheral face of the side plate 1a of a lower frame 1 and a recessed part or a hole 1e is provided on another one. Then, the projected part 3e is hooked with the recessed part or the hole 1e. In addition, the apex of the projected part 3e is projected from the recessed part or the hole 1e to be hooked. In addition, by pinching a filter material 2 between the upper frame 3 and the lower frame 1, it is possible to facilitate exchanging of the filter material 2 and to reuse the frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter in which a filter medium can be replaced and a frame can be reused.

[0002]

2. Description of the Related Art Heretofore, the following air filters have been known which are capable of replacing a filter medium and reusing a frame. For example, in Japanese Utility Model Laid-Open No. 62-130759, a filter material in which a large number of synthetic resin chips are packed in a net made of a flammable material is composed of four side plates and a rear plate having four vent holes. The filter element, which is formed by inserting the main body into the main body and inserting the main body into the lid body including the four side plates and the rear plate having the four ventilation holes like the main body, is housed in the filter case. A disclosed air filter is disclosed. In addition, Japanese Utility Model Publication No. 5-13385 discloses that a filter member is separable into a three-sided frame formed so that the three sides are fitted therein and a one-sided frame formed so that the remaining one side is formed therein. A leaf spring to be inserted along the inner surfaces of both ends of the three-sided frame is attached to the inner surface of the portion, and each of the leaf springs is provided with a hooking bent portion,
Further, leaf springs that form gaps for inserting the leaf springs are attached to inner surfaces of both end portions of the three-sided frame, and engaging bent portions that engage with the hook bending portions are respectively attached to the leaf springs. An air purifying filter provided is disclosed.

[0003]

In the former case, since the main body containing the filtering material is simply inserted into the lid, the integration of the main body and the lid is insufficient. Further, if the main body and the lid are screwed or screwed together, they can be integrated, but a tool is used at the time of exchanging the filter medium, which requires time and labor for the exchanging work. Further, since the filter medium is simply contained in the main body, a gap is created between the side plate of the main body and the filter medium, and the filter medium moves back and forth and left and right in the main body, so that the contaminated air is contaminated. There is a risk that the gas will flow downstream without passing through the filter media. In the latter case, the three-sided frame and the one-sided frame can be easily integrated without screwing or screwing and the filter can be easily disassembled because only the one-sided frame needs to be separated when replacing the filter. On the other hand, while shortening and reducing labor are required, there are problems that not only the number of component parts of the filter frame increases but the manufacturing process becomes complicated, but also it is difficult to assemble the frame member into the enclosure shape with accurate dimensional accuracy. Further, if the joint portion of the frame member is displaced due to this, not only the airtightness is deteriorated, but also a protrusion is formed on the filter frame, which makes it difficult to insert the filter medium into the three-sided frame at the time of manufacturing or replacing the filter. Alternatively, there is a problem that the filter medium is damaged or deformed.

[0004]

In order to solve the above-mentioned conventional problems, the air filter of the present invention has four side plates which are formed in a surrounding frame and have openings on the upper and lower surfaces and a filter material on the lower surface. A lower frame having an extended frame edge, a filter medium housed in the lower frame, and a frame for holding the filter medium formed on the frame by four side plates and having openings on the upper and lower surfaces. An air filter comprising an upper frame which can be hermetically sealed so as to accommodate the lower frame by extending a side, and a convex portion is formed on one of the inner peripheral surface of the side plate of the upper frame or the outer peripheral surface of the side plate of the lower frame. At the same time, the other part is provided with a recess or hole so that the projection and the recess or hole are engaged with each other. In this case, the convex portion is provided on the inner peripheral surface of the upper frame and the tip of the convex portion is projected from the hole provided on the lower frame, or the convex portion is formed on the inner peripheral surface of the upper frame. It is preferable that the concave portion of the lower frame that engages with the convex portion is configured to protrude inside the lower frame. Further, it is preferable that the upper frame and the lower frame are formed by bending an L-shaped band-shaped plate into a frame shape and joining end portions of the band-shaped plate.

[0005]

The air filter according to the present invention comprises a lower frame having four side plates formed in a frame and having openings on the upper and lower surfaces thereof, and a frame for placing a filter medium extending on the lower surface, and the lower frame. A filter medium housed therein and four side plates are formed in an enclosure to have openings on the upper and lower surfaces, and a frame for pressing the filter medium is extended on the upper surface so that the lower frame can be sealed. Since it consists of the upper frame, the filter medium can be replaced and the frame can be reused. Moreover, the filter frame is not riveted or screwed, and a convex portion is provided on one of the side plate inner peripheral surface of the upper frame or the side plate outer peripheral surface of the lower frame, and a concave portion or hole is provided on the other side. By engaging the convex portion with the concave portion or the hole, the upper frame and the lower frame can be easily integrated, and labor is required for replacing the filter in a short time without using any special tool. Can be replaced without Further, since the filter element housed in the lower frame can be pressed and fixed from the surroundings by the inward protrusion formed by the convex tip of the upper frame protruding from the hole of the lower frame or the concave section of the lower frame, the filter element can move. Can be fixed without. Further, when the strip-shaped plate obtained by bending the upper frame and the lower frame into an L-shape is folded into a frame shape and the end portions of the strip-shaped plate are joined to each other to form the strip-shaped plate, only one joint can be formed and the strip-shaped plate can be formed. The filter frame can be obtained simply by bending the plate into the shape of an enclosure, and the assembling property is good, and it can be assembled into the shape of an enclosure with accurate dimensional accuracy.

[0006]

Embodiments of the air filter of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the air filter of the present invention, which is in a disassembled state. 1 in the figure
Is a lower frame which is formed on the surrounding frame by four side plates 1a, 1a, 1a, 1a, has an upper surface opening 1b and a lower surface opening 1c, and has a filter material mounting frame 1d extending on the lower surface. . still,
An engagement hole 1e is provided at the center of each side plate 1a.

Reference numeral 2 in the drawing is a filter pack-shaped filter medium in which a nonwoven fabric 2a made of synthetic fibers or inorganic fibers is folded and the peaks thereof are fixed by ribbon-shaped spacing members 2b. A sponge 2c made of urethane foam is attached to at least one side of the filter medium 2, that is, one of the long sides in this embodiment.

Reference numeral 3 in the drawing denotes four side plates 3a, 3a,
The upper frame 3 has an upper surface opening 3b and a lower surface opening 3c which are formed in a surrounding frame by 3a and 3a and have a filter material holding frame 3d extending on the upper surface. An engaging projection 3e is provided at the center of each side plate 3a. The upper frame 3 is formed slightly larger so that the lower frame 1 can be housed as a lid. In the figure, 1f and 3f indicate rivets.

FIG. 2 is an enlarged cross-sectional view of an essential part showing a state in which the filter medium 2 is housed in the lower frame 1 and the lower frame 1 is sealed so as to be housed in the upper frame 3. As shown, the protrusion 3e of the upper frame 3
Is engaged with the hole 1e of the lower frame 1 so that the upper frame 3 and the lower frame 1 are firmly integrated, and the projection 3e protruding into the lower frame 1 through the hole 1e presses the filter medium 2 from four directions. In this way, the filter medium 2 is fixed in the lower frame 1 in cooperation with the sponge 2c of the filter medium 2.
Is trying not to move.

By providing a recess 1g projecting inward instead of the hole 1e in the lower frame 1, the same effect can be obtained as shown in FIG. In the drawings, the same members as those in the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof is omitted.

FIG. 4 is a development view of the lower frame 1 having a thickness of about 1
A side plate 1a and a frame edge 1d are integrally formed of a thin steel plate of mm, and a V-shaped cutout portion 1i that opens to about 90 ° C. is formed in the frame edge 1d at a position of a bending line 1h when bent in an L shape. The band-shaped plate 10 provided is prepared, bent along the bending line 1j, and is connected to the rivet fixing holes 1k and 1k provided on the frame side 1d through the rivets 1f to form an enclosing frame. The V-shaped cutout portion 1i is formed by cutting out the V-shaped apex so that the V-shaped apex is inserted into the frame edge 1d side by about 1 to 1.5 mm from the bending line 1h of the frame edge 1d. There is. In this way, by inserting the V-shaped apex into the frame edge 1d side, the frame edge 1d does not bulge outward of the lower frame 1 when the strip plate 10 is bent into the L shape, Frame edges 1d, d of the respective sides that are adjacent to each other through each notch 1i
It can be bent in a state where the two are attached to each other with accurate dimensional accuracy. Further, as shown in FIG. 5, by providing the cutout portion 1m on the opposite side of the folding line 1j of the strip plate 10, the strip plate 10 can be accurately folded along the folding line 1j, and Can be surely prevented from bulging outward. Although not particularly shown, the upper frame 3 is also formed in the shape of a surrounding frame in the same manner as the lower frame.

Further, in the above embodiment, the lower frame 1 and the upper frame 3
Both side plates 1a and 3a are so-called blind plates without notches, but as shown in FIG. 6, for example, a notch portion 1n is provided in the central portion of the side plate 1a of the lower frame 1 leaving a corner portion, The weight may be reduced. The cutout portion 1n for the purpose of reducing the weight is provided at any position as long as the required airtightness can be obtained. When such a notch 1n is provided, it is preferable that the engaging hole 1e and the recess 1g of the lower frame 1 and the protrusion 3e of the upper frame 3 be provided at the corner portion.

Further, in the above embodiment, the projection 3e is provided on the inner peripheral surface of the side plate 3a of the upper frame 3, and the recess 1g or the engaging hole 1e is provided on the outer peripheral surface of the side plate 1a of the lower frame 1. On the contrary, a concave portion or an engaging hole may be provided on the inner peripheral surface of the side plate 3a of the upper frame 3, and a convex portion may be provided on the outer peripheral surface of the side plate 1a of the lower frame 1.

When it is necessary to connect a plurality of air filters, as shown in FIG. 7, for example, a plurality of loops are provided on the side plates 3a, 3a adjacent to the upper frame 3 of the air filters to be connected. By attaching the connecting member 11 such as a so-called laminated fastener composed of a strip and a plurality of hooks, the air filter can be easily connected and separated.

Although the filter medium is in the form of a filter pack in the above embodiment, it may be a dry felt such as synthetic fiber or inorganic fiber. Further, although the upper frame and the lower frame are made of thin steel plates in the above embodiment, they may be made of plastic, cardboard, cardboard or the like. Further, although the upper frame and the lower frame are connected by rivets in the above-described embodiment, the connection is not limited to this. Well, the method is arbitrary. Further, in the above-mentioned embodiment, the upper frame and the lower frame were created by bending the strip-shaped plate, but the invention is not limited to this, and the openings on the upper surface or the lower surface are punched out, and the side portions are fixed by welding or the like. It can also be created. Further, in the above-described embodiment, the convex portion and the concave portion provided on the side plates of the upper frame and the lower frame have one central portion, but they may have a plurality of points, and may have a straight line or a broken line in the vertical or horizontal direction.

[0016]

According to the present invention, the following effects can be obtained. (1) The filter material can be exchanged and the frame can be reused, thereby reducing waste, saving resources and recycling. (2) Assembly and replacement of filters is simplified and time is shortened.
Labor saving can be achieved. (3) There is no displacement of the filter medium, and the upper frame and the lower frame can be integrated.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of an air filter of the present invention.

FIG. 2 is an enlarged cross-sectional view of the relevant part.

FIG. 3 is an enlarged sectional view of an essential part of another embodiment of the air filter of the present invention.

FIG. 4 is a development view of a lower frame of an embodiment of the air filter of the present invention.

FIG. 5 is a development view of a lower frame of another embodiment of the air filter of the present invention.

FIG. 6 is a perspective view of a lower frame of still another embodiment of the air filter of the present invention.

FIG. 7 is a perspective view showing an example of a connected body of the air filter of the present invention.

[Explanation of symbols]

 1 Lower Frame 1a Side Plate 1b Upper Surface Opening 1c Lower Surface Opening 1d Frame Edge 1e Engagement Hole 1f Rivet 1g Recess 1h Bent Line 1i Cutout 1j Folding Line 1k Rivet Fixing Hole 1m Cutout 1n Cutout 2a Non-woven fabric 2b Spacing material 2c Sponge 3 Upper frame 3a Side plate 3b Upper surface opening 3c Lower surface opening 3d Frame edge 3e Projection 3f Rivet 10 Strip plate 11 Connecting member

Claims (4)

[Claims] 1. A lower frame, which is formed in an enclosure by four side plates, has opening portions on the upper and lower surfaces, and extends a frame for filter material placement on the lower surface, and is housed in the lower frame. Air consisting of a filter medium and an upper frame which is formed in an enclosure by four side plates and which has openings on the upper and lower surfaces and extends a frame for pressing the filter medium on the upper surface so as to accommodate the lower frame. A filter, wherein a convex portion is provided on one of the side plate inner peripheral surface of the upper frame or the side plate outer peripheral surface of the lower frame, and a concave portion or hole is provided on the other side, and the convex portion and the concave portion or hole are engaged. An air filter characterized by being adapted to. 2. The air filter according to claim 1, wherein the projection is provided on the inner peripheral surface of the upper frame, and the tip of the projection is projected from a hole provided in the lower frame. . 3. The convex portion is provided on the inner peripheral surface of the upper frame, and the concave portion of the lower frame that engages with the convex portion projects inside the lower frame. 1. The air filter according to 1. 4. The upper frame and the lower frame are formed by bending an L-shaped band-shaped plate into a frame shape and joining end portions of the band-shaped plate. The air filter according to any one of 3 above.