JPH024326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter element used for filtering fluids such as oil and air.

BACKGROUND ART Conventionally, there are various types of filter elements, one of which is a type using filter paper. A filter element using filter paper is constructed by winding the filter paper into a roll or by folding the filter paper in a zigzag pattern to form a large number of pleats and then rolling it into a cylindrical shape. In a filter element that is folded in a zigzag pattern to form a large number of pleats and then rolled into a cylindrical shape, the pitch of the pleats is small on the inner circumference and large on the outer circumference. For this reason,
The density of the filter paper becomes coarse at the outer periphery, and sufficient filtration performance cannot be exhibited due to insufficient filtration area.

Therefore, in order to improve the filtration performance of a filter element that is folded in a zigzag pattern to form a large number of folds, as described in Japanese Patent Application Laid-Open No. 60-238111, folds are folded into the tops of the folds that protrude toward the outer periphery. Some have shallow M-shaped folds.

Problems to be Solved by the Invention In a filter element in which M-shaped folds with a shallow folding depth are formed, the folds with a deep folding depth sandwiched between the M-shaped folds tend to be in a close contact state, and this close contact causes There may be a portion where the filtration effect cannot be exerted, resulting in a decrease in filtration performance.

Means for Solving the Problem A long filter paper is warped in the longitudinal direction and folded in a zigzag pattern to form a large number of pleats, and after forming the pleats, it is rolled into a cylindrical shape. The pleats that are convex toward the inner periphery of the cylindrical shape are used as inclined pleats in which the folding depths at both ends of the pleat are different, and the folding depth becomes shallower from one end to the other end. Inclined pleats with increasing folding depth are arranged alternately.

Function The inclined pleats that are convex toward the inner periphery of the cylinder have a larger distance between adjacent inclined pleats at their tips, thereby preventing the inclined pleats from coming into close contact with each other.

Embodiment An embodiment of the present invention will be described based on the drawings.
First, a long filter paper 1 is provided, and a large number of orthogonal fold lines 2 are provided on this filter paper 1 in a direction perpendicular to the longitudinal direction of the filter paper 1, which are parallel to each other and arranged at regular intervals. . Next, an inclined folding line 3 is provided which bisects a portion sandwiched between a pair of adjacent orthogonal folding lines 2 and has a predetermined inclination angle α with respect to the orthogonal folding line 2.
Note that the pair of inclined folding lines 3 located across the orthogonal folding line 2 are provided line-symmetrically with respect to the orthogonal folding line 2.

Next, the filter paper 1 is folded in a zigzag shape along the orthogonal folding line 2 and the inclined folding line 3, thereby forming a large number of folds 4 and a large number of inclined folds 5, which are folds. Here, the folds 4 having the sloped folding line 3 at the top are folds 4.
The folding depth is constant from the upper end to the lower end. On the other hand, the orthogonal folding line 2
The inclined pleats 5 have different folding depths at both ends of the inclined pleats 5, with the folding depth gradually increasing from the upper end side to the lower end side, and the inclined pleats 5 having the folding depths gradually increasing from the upper end side to the lower end side. Inclined pleats 5 whose folding depths gradually become shallower are arranged alternately. Then, the filter paper 1 formed by folding these pleats 4 and inclined pleats 5 is rolled into a cylindrical shape with the pleats 4 convex toward the outer circumference, and is attached to the outer circumference of an inner pipe (not shown). It is being

A large number of through holes (not shown) are formed in the wall surface of the inner pipe, and end plates are provided at both upper and lower ends of the inner pipe to cover the upper and lower ends of the filter paper 1 rolled into a cylindrical shape. 6 is fixed.
A flange portion 7 for holding both upper and lower ends of the pleats 4 is formed at the peripheral edge of the end plate 6, and an opening 8 communicating with the inside of the inner pipe is formed at the center of one end plate 6. There is.

In such a configuration, when the filter 9, which is made by rolling up the filter paper 1 with the pleats 4 and the inclined pleats 5 and attaching it to the outer periphery of the inner pipe, is installed at a predetermined installation location in the filtration device, fluid containing dirt and dust is removed. passes through the filter paper 1 from the outer circumferential side of the filter 9 to reach the inner circumferential side of the cylindrical filter paper 1, and further reaches the inside of the inner pipe through the through hole of the inner pipe. Then, when the fluid passes through the filter paper 1, dirt, dust, etc. contained in the fluid are removed, and the fluid from which the dirt, dust, etc. have been removed flows out from the openings 8.

Here, when the filter paper 1 is rolled up into a cylindrical shape, the sloped pleats 5 which become convex toward the inner circumference are the sloped pleats 5 whose folding depth becomes shallower from the upper end side to the lower end side.
and inclined pleats 5 whose folding depth becomes deeper from the upper end side to the lower end side are arranged alternately, and regarding one inclined pleat 5, the folding depth at one end is shallow and the folding depth at the other end is small. It's getting deeper.
Therefore, the elasticity of the shallowly folded portion of the inclined pleat 5 prevents the deep folded portion of the adjacent inclined pleat 5 from coming into contact with each other, and the inclined pleats 5 are prevented from coming into close contact with each other. Deterioration of filtration performance is prevented. Then, the deep folding depth portions of the inclined pleats 5 are adjacent to every other inclined pleat 5, and the intervals between the deep folding depth portions of the inclined pleats 5 become large. Therefore, even when the pleats 4 and the inclined pleats 5 are made dense, the inclined pleats 5 are prevented from coming into close contact with each other, and the density of the filter paper 1 as a whole can be made dense, increasing the filtration area. . Therefore, the filtration performance is improved and the replacement cycle of the filter 9 is lengthened. Furthermore, since sufficient filtration performance can be obtained even if the outer diameter of the filter 9 is reduced, the size of the filtration device can be reduced by reducing the outer diameter of the filter 9.

Note that when the filter paper 1 is unfolded, the upper and lower edges of the filter paper 1 are not straight lines but have an uneven shape as shown in FIG. You can punch it out, or
A rectangular filter paper may be folded and then cut so that the upper and lower ends thereof are parallel to each other.

Alternatively, a rectangular filter paper may simply be folded in. In that case, the shape of the end plate is approximately dish-shaped to match the shape of the deep folded part of the inclined pleats 5, and the end plate is protruded upward. The shallow folded portions of the inclined pleats 5 are adhered within the recesses formed on the outer periphery of the dish-shaped end plate via resin or the like.

Although a cylindrical inner pipe is used in this embodiment, the shape of the outer circumferential part of the inner pipe may be a shape in which approximately the center in the vertical direction is bulged so that the tops of the inclined folds 5 come into contact. In this case, the holding state of the filter paper 1 rolled into a cylindrical shape becomes even more stable.

Effects of the Invention The present invention provides that when a filter paper formed by folding a large number of folds as described above is rolled up into a cylindrical shape, the folds are convex toward the inner circumference, and the folding depths are different at both ends of the folds. In addition to the sloped pleats, the sloped pleats have a folding depth that gradually becomes deeper from one end to the other, and the sloped pleats that have a folding depth that gradually becomes shallower from one end to the other end are arranged alternately. Even when the spacing is narrowed, it is possible to prevent the inclined pleats from coming into close contact with each other. Therefore, the density of the filter paper can be made denser, the filtration area can be increased, and the filtration performance can be improved. This has the effect of making it possible to downsize the filtration device while maintaining filtration performance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing a partially cut away filter paper formed with pleats and rolled into a cylindrical shape; FIG. 2 is a perspective view showing a filter; Figure 3 is a developed view of the filter paper, Figure 4
The figure is a perspective view showing a state in which the filter paper is folded in a zigzag shape. 1...filter paper, 4...folds, 5...slanted pleats (folds).

Claims (1)

[Claims] 1. A long filter paper is folded in a zigzag shape in the longitudinal direction to form a large number of folds, and the filter paper is rolled into a cylindrical shape, and the folds, which are convex toward the inner circumference of the cylinder, are folded at both ends. The slanted pleats have different folding depths, and the slanted pleats have a folding depth that gradually becomes shallower from one end to the other, and the slanted pleats have a folding depth that gradually becomes deeper from one end to the other end. A filter element featuring