JPH029863Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter assembly for purifying fluid, and more particularly to a means for fixing an edge of a filter frame and a flange frame.

Filter assemblies that purify fluids such as air are widely used in various fields including air conditioning.

As shown in FIG. 1, this type of filter assembly houses a filter material 3 in a cylindrical filter frame 2 whose one end face is closed by a fixed frame 1, and a filter material 3 is housed in the filter frame 2 at the other end. It is assembled by fitting the flange frame 4 around the edges, and there has been a desire for an assembly that is easy to assemble and easy to handle.

The assembly configuration of the filter frame 2 and flange frame 4 of this filter assembly is as shown in FIG.
A clamp member having a U-shaped cross section is held in a state where the end of the filter frame 2 is mounted and engaged with the inner plate 4b of the flange frame 4 which is bent into a substantially U-shape from both sides of the base plate portion 4a. 5 is elastically pushed between the upper surface of the filter frame 2 and the outer plate 4c of the flange frame 4, and the filter frame 2 is fixed to the inner plate 4b of the flange frame 4 by pressure contact force of the clamp member 5. be.

Note that the inner plate 4b of the flange frame 4 is bent outward from the end to form a filter holding plate portion 4d.
is formed. Further, a sealing material 6 is provided on the inner surface of the filter frame 2 to prevent fluid leakage. The end of the filter material 3 is connected to this sealing material 6.
The front peripheral portion of the filter material 3 is brought into contact with the filter holding plate portion 4d, so that the filter material 3 is held.

This filter material 3 is a so-called pleated type filter sheet that is folded in a zigzag manner, and the plurality of filter materials 3 are arranged in the filter frame 2 so that the pleats are lined up in a direction transverse to the processing gas flow. ing. Adjacent folds are kept at a predetermined distance, for example, via a spacer member.

Since this arrangement of the filter material 3 is well known, its details will be omitted.

In the assembly structure shown in FIG. 2, since the assembly frame is formed by three members, the filter frame 2, the flange frame 4, and the clamp member 5, the rigidity of the assembly frame can be increased, and the filter Although the assembly can be easily handled, the clamp member 5 is always required to secure the filter frame 2 and the flange frame 4, and it is not only troublesome to manufacture this clamp member 5, but also requires a large number of parts. The disadvantage was that there were a large number of points and it was not possible to reduce production costs.

In order to overcome these drawbacks, an improved filter assembly as shown in FIG. 3 has recently been used. This improved filter assembly has an edge of the side surface 2a of the filter frame bent at an acute angle.
Furthermore, make an obtuse angle halfway with the tip 2
It is characterized in that the elastic locking piece 7 is formed by bending it into steps. As shown in FIG. 3, the assembly structure of the filter frame 2 and flange frame 4 of this improved filter assembly is as shown in FIG. The lower surface of the end of the portion 2a is mounted and engaged with the inner plate 4b, and the elastic locking piece 7 is elastically pressed against the outer plate 4c, so that its tip portion is locked with the end surface of the folded portion 4c' of the outer plate 4c. It is.

However, in the case of this improved filter assembly, the clamping member 5 required for the old type assembly shown in FIG. However, since the rigidity of the assembly frame consisting of both frames 2 and 4 is weakened, the assembly frame may bend or wobble while handling the filter assembly. There was a problem that it was difficult to handle. Therefore, in order to alleviate the above-mentioned problems even a little in this improved assembly, it is necessary to use a special material with high rigidity as the material for the frames 2 and 4, which increases the material cost and weight. This caused an inconvenience.

Furthermore, as described above, since the tip of the elastic locking piece 7 is locked to the tip of the folded portion 4c' of the outer plate 4c, the shape of the elastic locking piece 7, that is, the length and bending angle of the elastic locking piece 7 is There is a constraint that it must be manufactured with high precision. However, it is extremely difficult to process the shape of the elastic locking piece 7 with high precision, which involves bending, and for this reason, the length of the elastic locking piece 7 is too short. The outer end may not be able to lock onto the tip of the folded portion 4c', or the length of the elastic locking piece 7 may be too long for the outer end to fully fit into the tip of the folded portion 4c'. There was a problem that the engagement with ' was not carried out effectively.

Furthermore, even if the engagement between the elastic locking piece 7 and the folded portion 4c' is carried out conveniently,
Since the plate thickness of the folded portion 4c' is relatively thin, the stability of the engagement between the two is poor, and there is a problem that the engagement is easily disengaged due to vibration or the like.

This idea was devised in view of the above circumstances, and its purpose is to stably maintain the press-fixed state between the filter frame and the flange frame, and to provide a filter assembly that is easy to manufacture and handle. The purpose is to provide three-dimensionality.

In order to achieve the above object, the present invention includes a filter frame having a cylindrical shape with both ends open and consisting of circumferential side plates;
A filter material housed in the filter frame, and a filter holding plate portion that has a substantially U-shaped cross section that frames the periphery of the open end of the filter frame, and that is bent from its inner plate and comes into contact with the end surface of the filter material. A filter assembly comprising a flange frame having a flange frame, wherein an elastic band is formed on a circumferential side plate of the filter frame, and is bent at an acute angle from an end thereof toward the outside, and is elastically pushed into a U-shaped cross-section of the flange frame. In addition to providing a stopper piece, a locking groove is formed in the circumferential direction on the outer plate of the U-shaped cross section of the flange frame, which is bent outwardly and into which the outer end of the elastic locking piece locks. The structure is as follows.

An embodiment of the present invention will be described below with reference to FIG. Incidentally, here, the same members as those shown in FIGS. 1 to 3 are given the same reference numerals, and the explanation thereof will be simplified.

Therefore, the flange frame 4 shown in FIG.
Similar to the conventional one shown in FIG. 3 and FIG.
The outer plate 4c is bent into a U-shaped portion, and a folded portion 4c' is provided at the tip of the outer plate 4c to ensure safety in handling. A conventional flange frame 4 is provided at the inner position of the folded portion 4c'.
A locking groove 8, which cannot be seen in the figure, is provided around the periphery. This locking groove 8 is formed by bending the wall surface of the outer plate 4c into a substantially square cross-section by pressing or the like so as to bulge outward.

Note that, as in the conventional case, the end portion of the inner plate 4a is bent outward to form the filter material holding portion 4d.

On the other hand, the filter frame 2 has an elastic locking piece 7 formed by bending the end of the side surface 2a outward at an acute angle. The height of the elastic locking piece 7, that is, the shortest distance from the outer end of the elastic locking piece 7 to the side surface portion 2a, is designed to be larger than the distance between the inner and outer plates 4b, 4c.

Therefore, in assembling the filter frame 2 and the flange frame 4, one end of the filter frame 2 is closed by the fixed frame 1, and the filter materials 3 are accommodated in a well-known arrangement form. This is done by elastically inserting the edge between the inner and outer side plates 4b, 4c of the flange frame 4. By inserting the filter frame 2, the inner surface of the side surface 2a of the filter frame 2 is mounted and engaged with the inner plate 4b, and the elastic locking piece 7 is arranged between the inner and outer plates 4b and 4c in an elastically deformed state. , the outer end of the elastic locking piece 7 is in the locking groove 8.
Fixation of both frames 2 and 4 is achieved by elastically locking the frames 2 and 4.

In this way, the outer end of the elastic locking piece 7 enters into the locking groove 8 and is locked, so the shape of the elastic locking piece 8 does not have to be manufactured with high precision, and as shown in FIG. The locking can be performed reliably even without folding the frame into stages, and the fixed engagement between the frames 2 and 4 will not come off due to external forces such as vibrations.

In addition, since the locking groove 7 is bent and formed on the outer plate 4c, it becomes like a kind of reinforcing rib and the rigidity of the flange frame 4 can be increased.Therefore, the stiffness of the filter assembly is strengthened and the It becomes possible to facilitate the handling of the assembly.

Furthermore, due to the increased rigidity provided by the locking groove 8, it is possible to ensure the rigidity of the assembly to withstand use without using special expensive materials for both frames 2 and 4, thereby reducing material costs and weight. is also possible.

Since the present invention is made as detailed above, it is possible to stably maintain the press-fixed state between the filter frame and the flange frame, and it also facilitates handling of the filter assembly and reduces manufacturing costs. This is extremely useful in practice.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of the filter assembly, Figure 2 is a perspective view of the filter assembly.
The figure is a sectional view of the assembled configuration of a conventional filter assembly.
FIG. 3 is a cross-sectional view of another conventional filter assembly, and FIG. 4 is a cross-sectional view of the filter assembly according to an embodiment of the present invention. 1...Fixed frame, 2...Filter frame, 2a...
Side part, 3... Filter material, 4... Flange frame, 4a... Base plate part, 4b... Inner plate, 4c
...Outer plate, 4d...Filter holding plate part, 4
c'...Folded part, 5...Clamp member, 6...
Sealing material, 7... elastic locking piece, 8... locking groove.

Claims (1)

[Scope of utility model registration request] A filter frame having a cylindrical shape with both ends open and made of a circumferential side plate, a filter material housed in the filter frame, and a substantially U-shaped cross section that frames the periphery of the open end of the filter frame, and is foldable from the inner plate. A filter assembly comprising a flange frame having a filter holding plate portion bent and abutting the end surface of the filter material, wherein the flange frame is bent at an acute angle outward from the end portion of the peripheral side plate of the filter frame. An elastic locking piece is provided that is elastically pushed into the U-shaped cross section of the frame, and an elastic locking piece is provided inside the outer plate of the U-shaped cross section of the flange frame that is bent so as to bulge outward. A filter assembly characterized in that a locking groove whose end is locked is formed in a circumferential direction.