JPS588887B2 - filter cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter cylinder having a large number of axial folds formed around the periphery and a dust removal body inside, and aims to provide a filter cylinder that is small and has good performance. .

Conventionally, in a filter tube in which a regular polygonal filter tube is formed using a filter material with a large number of folds bent, and a rotating dust remover is arranged at the center of the tube, an elastic repelling arm provided on the rotary dust remover is used to form a regular polygonal filter tube. The arm bends differently when passing through the center of the group and when passing through the boundary within the fold group, which has the disadvantage that the rotation becomes jerky and not smooth.

The present invention has been made in view of the above points, and an embodiment shown in the drawings will be described below.

The filter tube 1 is formed into a regular hexagonal tube by folding a large number of pleats 2 at a uniform depth into a band of filter material made of resin-treated filter paper or nonwoven fabric, and connecting the ends.

Then, the cylinder 3 is formed so as to wrap around each side of the regular hexagon.

Then, the axial folds 2 are divided into groups equal to the number of sides of the regular hexagon, the inner edge of the folds 2 circumscribes each side of the regular hexagon, and the folds 2 on each side protrude in the same direction for each side. Become.

As seen in FIG. 1, there are a total of six groups of folds 2, from G1 to 06.

Then, this cylindrical body 3 is set in a mold (not shown), and end plates 4 are connected to both ends of the axial folds 2 by injecting molten resin.
, 5 are integrally formed, and reinforcing pieces 6, 6, . . ., connecting the end plates 4, 5 are formed.

Furthermore, reinforcing layers 7, 7, . . . are formed on the inner ridgeline of each fold 2 using the same material as the end plates 4, 5.

Further, instead of the reinforcing layer 7, a diaphragm 8 protruding inside each fold 2 may be inserted.

Reference numeral 9 denotes a rotary dust remover disposed at the center of the cylinder 3, and the dust remover has two pairs of elastic repelling arms 10 that engage the folds 2, and one of the pair of repelling arms When one side faces the center of the side, that is, the center of the fold group, the other side faces the boundary of the fold group, so that the resistance received by both sides is harmonized in strength and weakness, and always shows a substantially uniform sum. .

The angle relationship of the repelling arm that satisfies this relationship can be expressed mathematically as follows.

(However, n=Q, 1, 2,...m-1
) Here, θ is the angle between the pair of repelling arms, and m is the number of angles of the polygon.

In the embodiment shown in FIGS. 2 and 3, four repelling arms 10 are provided at 90° intervals, and in the above equation, m = 5, n = l, set at θ-90°, and the repelling arm 10 at such angular intervals is This means that two pairs of arms are provided point-symmetrically.

The number of pairs of repelling arms and their arrangement are not particularly limited, but
In order to prevent an unbalanced load from being applied to the pivot point of the rotary dust remover 9, the repelling arm 10 is preferably arranged so as not to lose its symmetry around the central axis 11.

As described above, the filter cylinder according to the present invention is formed into a cylindrical shape by arranging a large number of axial folds on each side of a regular polygon, and a reinforcing layer is formed on the inner edge line of each fold to form a cylindrical filter in the axial direction. Both ends of the fold group are integrally connected by a synthetic resin end plate, and at the center of the cylinder there is a repelling arm pointing toward the center of the fold group, and a repelling arm having an angular relationship with the repelling arm pointing toward the boundary between the fold groups. Since the rotary dust removing body is provided with a pair of repelling arms, it is possible to provide a small-sized filter cylinder with good performance.

In addition, the resistance applied to the arm will be almost uniform in strength and weakness, and the rotating dust remover can operate smoothly.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing one embodiment of a filter cylinder of the present invention, and FIGS. 2 and 3 are end views taken from the direction of arrow A in FIG. 1, showing mutually different embodiments. 1... Filter cylinder, G1 to G6... Axial fold group, 4, 5... End plate, 7... Reinforcement layer, 9... ... Rotating dust remover, 10 ... Repelling arm.

Claims (1)

[Scope of Claims] 1. A large number of axial fold groups are arranged on each side of a regular polygon to form a cylindrical shape, and a reinforcing layer is formed on the inner ridge line of each fold to form a cylindrical shape. Both ends are integrally connected by a synthetic resin end plate, and the center of the cylinder has a repelling arm facing the center of the fold group and an angular relationship with the repelling arm pointing toward the boundary between the fold groups. A filter cylinder characterized in that a rotating dust removing body is provided with a pair of naruhajiki arms. 2. The filter cylinder according to claim 1, characterized in that a diaphragm protruding from the ridge line is inserted inside each fold instead of the reinforcing layer.