JPS592819Y2 - For air purification filtration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air purifying filtration element that is conveniently used, for example, in automobiles.

A conventionally well-known element of this type has a structure as shown in FIG.
It is equipped with

However, in the conventional method described above, it is necessary to make the pitch a of the pleats 1a of the filter medium 1 uniform in terms of filtration performance, so the filter medium 1 is attached to a metal pitch guide jig to make the pitch a uniform However, when adhering the end plate 3 to the upper and lower ends of the filter medium 1 and the lower end of the metal reinforcing member 2, the operator must transport the pitch guide jig, and this jig is It has the disadvantage of being heavy and inconvenient to transport.

Further, the pitch guide jig is expensive, and furthermore, it is very troublesome and troublesome to attach the filter medium 1 to the pitch guide jig.

Therefore, the current situation is that conventional elements have no choice but to be expensive.

Therefore, in view of the above points, the present invention aims to provide an air purifying filtration element in which the pitch of the folds of the filter medium can be made uniform by changing the shape of the filter medium without using a pitch guide jig. It is a purpose.

An example in which the present invention is applied to an automobile will be described below.

In FIGS. 2 to 6, reference numeral 1 denotes an annular filter medium mainly made of synthetic fibers made by mixing thermoplastic fibers such as polyester with rayon or the like.

This filter medium 1 has a large number of folds 1a with a wave-shaped cross section on the contaminated air inflow side (outer circumferential side), and has a large number of folds 1a with a corrugated cross-sectional shape on the contaminated air inflow side (outer circumferential side), and has a large number of folds 1a on the clean air outflow side (
It has a large number of bag parts 1b formed by overlapping both ends in the axial direction of bent parts of a large number of pleated parts 1a and fixing them by ultrasonic welding on the inner peripheral side).

Note that the fixed portion is indicated by 1C.

Next, the method for manufacturing the filter medium 1 will be explained as follows.

That is, as shown in FIG. 4, a sheet mainly made of synthetic fibers as described above is once folded to form a large number of pleats 1a, and both ends of every other bent portion of the pleats 1a are overlapped. The two ends are compressed in the direction of the arrow to fit them together, and then both ends are welded using high frequency welding to melt Bossester, which is a thermoplastic fiber in the synthetic fibers, and the two ends are fixed together to form the bag portion 1b.
form.

Thereafter, this sheet is bent into an annular shape so that the pleats 1a are on the outer circumferential side and the bag portions 1b are on the inner circumferential side, and one end of the sheet and the other end are connected by tightening an aluminum clip. .

Through the above steps, a filter medium 1 having pleats 1a and bag portions 1b is obtained.

2 is a metal annular reinforcing member, and this reinforcing member 2 is provided with a large number of through holes 2a.

This reinforcing member 2 is arranged outside the folds 1a of the filter medium 1.

Reference numeral 3 denotes an end plate made of, for example, a single-cell foamed urethane resin. It is something that unifies.

Reference numeral 4 denotes a metal case that houses the filter element 5 having the above structure, and has a contaminated air introduction pipe 6.

7 is a metal lid, and this metal lid 7 is detachably attached to the case 4.

Reference numeral 8 denotes an annular rubber gasket, which is adhesively fixed to the bottom of the metal case 4 and the inner surface of the metal lid 7.

Then, due to the load when the metal lid 7 is attached to the metal case 4, the gasket 8 is elastically pressed against the end plate 3 of the filtration element 5, and airtightness between the top and bottom of the filtration element 5 is maintained. .

Note that the metal case 4 is fixed to a carburetor (not shown) of an automobile engine.

Next, the operation of the above configuration will be explained.

Contaminated air flows from the outer periphery to the inner periphery of the filter medium 1 as shown by the arrow in FIG. 4a to the vaporizer.

By the way, in the above embodiment, the folds 1a are formed on the outer circumference of the annular filter medium 1, and the bag portions 1b are formed on the inner circumference. Since the bag part 1b is pulled at the border of the part 1b and the tension is restricted by the bag part 1b having both ends fixed, the individual pitches a of the many pleat parts 1a are uniform.

Therefore, there is no need to use a pitch guide jig to even out the individual pitches a of the large number of pleats 1a.

In the above embodiment, the end plate 3 is attached to the folded portion 1a of the filter medium 1.
Since only both ends in the axial direction are provided, there is an advantage that the material for the end plates can be saved and the weight of the filter element 5 itself can be reduced.

The present invention is not limited to the above embodiments, but can be modified in various ways as described below.

(1) As a method for fixing both ends of the bent portions of the folds of the filter medium 1, when thermoplastic fibers are used as the material of the filter medium 1, microwave welding or the like may be used in addition to the above-mentioned ultrasonic welding.

Furthermore, when thermoplastic fibers that are melted by these welding methods are not used (for example, natural fibers), they may be fixed with an adhesive.

(2) Although the reinforcing member 2 is used in the above embodiment, the reinforcing member 2 can be omitted by changing the shapes of the case 4 and the lid 7.

(3) The present invention is not limited to use in automobiles, and it goes without saying that the structure of the present invention can also be applied to filter elements for agricultural engines and the like.

As described above, the present invention includes an annular filter medium having a large number of folds with a wave-shaped cross section, and overlaps both ends of the bent portions of the folds on the inner circumferential side of the filter medium in the axial direction. Since it is fixed, by making it into an annular shape, the tensile force that acts on the many folds on the outer circumference is regulated by the many fixed parts on the inner circumference, so that the individual pitches of the many folds are equalized. Therefore, there is no need to use a pitch guide jig to equalize the individual pitches of a large number of pleats as in the past, and the use of this pitch guide jig has the excellent effect of eliminating the conventional drawbacks. There is.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing a conventional filtration element.
FIG. 2 is a partially cutaway plan view showing one embodiment of the filter element according to the present invention, FIG. 3 is a perspective view showing a part of the filter medium 1 shown in FIG. 2, and FIG. FIG. 5 is a sectional view taken along line A-A in FIG. 2, and FIG. 6 is an air cleaner for automobile engines equipped with an embodiment of the filter element of the present invention. It is a sectional view showing a container. 1... Filter medium, 1a... Fold section, 1b.
...Bag part, 1C...Fixed part.

Claims (1)

[Scope of utility model registration request] An air purifier comprising an annular filter medium having a large number of folds bent in a wave-like cross-sectional shape, and having both ends in the axial direction of the bent portions of the folds on the inner circumferential side of the filter medium overlapped and fixed together. filtration element.