JPH0410886Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to improvement of a filter element.

[Prior art] A chrysanthemum-shaped filter element is made into a cylindrical shape by folding a filter sheet in a zigzag pattern at equal pitches, arranging the folds radially toward the center, and then gluing the edges of the sheet together. It is rolled and widely used as a filter element in air cleaners.

[Problems to be solved by the invention] The problem with this type of filter element is that if the depth of the pleats is made large in order to secure a large filtration area, shape retention is lost, twisting occurs, and the folds stick together. Two problems are that an effective filtration pocket cannot be secured, and that increasing the height lowers the rigidity against loads.

To solve this problem, conventionally, the filter sheet is embossed in a waveform perpendicular to the folding direction to prevent twisting of the pleats, but when the height of the cylinder is high, The effect was also low.

This idea was devised in view of the above problems, and its purpose is to increase the rigidity against loads when the height of the chrysanthemum-shaped filter element is increased, and to prevent twisting of the pleats to create an effective filter pocket. The goal is to ensure that

《Means for solving the problem》 In order to achieve the above purpose, according to this invention,
In a chrysanthemum-shaped filter element that is formed by folding a filter sheet in a zigzag pattern and rolling it into a cylindrical shape with a large number of folds formed by the folding radially arranged toward the center, the filter sheet has a cross section that is substantially horizontal perpendicular to the folding direction. Forming shaped reinforcing pieces by folding,
A feature is that each pleat is divided into a plurality of sections in the height direction by the reinforcing strip.

<<Example>> Hereinafter, an example of this invention will be described in detail with reference to the drawings.

FIGS. 1a and 1b are developed views showing the front and back surfaces of a filter sheet constituting a filter element according to this invention in a folded and unfolded state, and FIG. 2 is a view of FIG. FIG.

In the figure, reference numeral 1 denotes a filter sheet, and the filter sheet 1 has a plurality of folds 1a arranged horizontally at equal pitches and folded in a zigzag shape. Also, approximately in the center of the filter sheet 1 in the longitudinal direction, there is a fold 1a.
A band of reinforcing pieces 2 is formed in the lateral direction and is perpendicular to the horizontal direction.

The reinforcing piece 2 is a band-shaped piece having a substantially trapezoidal cross section by folding the upper and lower parts of the central part in the height direction of the filter sheet 1 into a Z-shape that is symmetrical in the transverse direction.

After forming this reinforcing piece 2, if the pleats 1a are folded, the reinforcing piece 2 will come into close contact with each pleat 1a. In this state, the filter sheet 1 is rolled into a cylindrical shape by gluing both ends. Next, a perforated cylinder (not shown) is fitted to the inner circumference thereof, and end plates 3, 3 are bonded to the end faces in the vertical direction as shown in FIG. 3, thereby completing the filter element 4.

Each pleat 1a of this filter element 4 is divided into upper and lower halves by the band of the reinforcing piece 2 as shown in the figure.

This divided part is divided into three parts by reinforcing piece 2.
It is twice as thick, and therefore, when a load is applied in the vertical direction, the reinforcing piece 2 acts as a node to receive the load, so if the height is the same, it will be compared to the one without the reinforcing piece 2. Large load-bearing performance can be obtained.
Furthermore, the twisting of each fold 1a is regulated by the close contact of the reinforcing piece 2.

In the embodiment, the filter element 4 is divided into two parts in the height direction by one reinforcing piece 2.
It goes without saying that a plurality of reinforcing pieces 2 may be formed and divided into even more sections.

<<Effects of the invention>> As explained in detail in the examples above, according to this invention, the structure as described above provides high rigidity against loads in the height direction, and each pleat does not twist. , a large effective filtration area can be secured.

[Brief explanation of the drawing]

FIGS. 1a and 1b are developed views showing the front and back surfaces of a filter sheet constituting a filter element according to this invention in a folded and unfolded state, and FIG. 2 is a view of FIG. The line sectional view and FIG. 3 are completed perspective views of the filter element. 1... Filter sheet, 1a... Fold, 2... Reinforcement piece, 4... Filter element.

Claims (1)

[Scope of utility model registration request] In a chrysanthemum-shaped filter element that is formed by folding a filter sheet in a zigzag pattern and rolling it into a cylindrical shape with a large number of folds formed by the folding radially arranged toward the center, the filter sheet has a cross section that is substantially horizontal perpendicular to the folding direction. A filter element characterized in that a shaped reinforcing piece is formed by folding, and each pleat is divided into a plurality of sections in the height direction by bands of the reinforcing piece.