JPS60238111A - Filter element - Google Patents

Abstract

PURPOSE:To obtain a filter element enhanced in filtering capacity and enabled in the achievement of miniaturization, by forming a filter body having a large number of pleats and a cylindrically rounded shape while forming turn-in parts having a depth smaller than that of the aforementioned pleats to the outer peripheral side thereof. CONSTITUTION:A filter body 7 is fabricated by folding composite filter paper 8 being long filter paper in a zigzag state to form a large number of pleats 9 and rounding the pleated filter paper into a cylindrical shape. Further, turn-in parts 10 are formed between pleats 9 provided to the outer peripheral side of the filter body 7 with a turn-in depth smaller than that of the pleats 9. As a result, the density of the composite filter paper 8 is enhanced in both of the outer and inner peripheral sides thereof and filtering capacity thereof is enhanced while the replacing cycle of the filter element using said filter body 7 becomes long. By forming the turn-in parts 10, the outer diameter dimension of the filter body 7 is contracted without lowering the filtering capacity thereof and the miniaturization of the filter element can be attained.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to filter elements used for the filtration of oil and air fluids.

Technical background of the invention and its problems Conventionally, there are filter elements with various structures, and those using filter paper include filter paper wound into a roll or folded into a zigzag shape.

Folded in a zigzag shape has relatively low fluid resistance and can be used in a wide range of applications, and after being folded in a zigzag shape, it is folded into a cylindrical circle, and then folded in a zigzag shape like this to form a large number of pleats. However, in a cylindrically rounded nineplant, the pitch of the folds is smaller on the inner circumferential side and larger on the outer circumferential side.

For this reason, the density of the filter paper is coarser on the outer periphery, and the filtration performance of the plant is lower on the outer periphery.

OBJECTS OF THE INVENTION The present invention was made in view of the above points, and an object of the present invention is to obtain a filter element that can improve filtration performance and achieve miniaturization.

Summary of the Invention The present invention involves folding a long filter paper in a zigzag shape to form a large number of pleats and providing a plant body rolled into a cylindrical shape.
Between the folds on the outer periphery of the plant, creases with a smaller folding depth than these folds are formed to make the filter paper on the outer periphery as dense as the inner periphery to improve filtration performance. The following is a structure in which the outer diameter is reduced while keeping the filtration area constant to improve the size of the filter.

A first embodiment of the present invention will be described based on FIGS. 1 and 2. First, a cylindrical inner cylinder (2) in which a large number of through holes (1) are formed is provided, and end plates (3) are attached to both ends of this inner cylinder (2). A backing (5) having an opening (4) is attached to the center of the end plate (3), and a flange portion (6) is bent around the periphery.

A plant (7) is provided which surrounds the outer peripheral portion of the inner tube (2) while being held on the inner surface of the flange portion (6).

The plant (7) is made by folding a composite filter paper (8), which is a long filter paper, into a zigzag shape to form a large number of pleats (9) and rolling it into a cylindrical shape. Further, between the folds (9) on the outer circumferential side of the plant (7), a folded part (11) is formed with a folded depth smaller than the folded depth of these folds (9).
is formed. The composite filter paper (8) is made by laminating activated filter paper αυ containing activated carbon or Tone Night on top of normal filter paper Q2.

In such a configuration, by forming the folded part α on the outer circumferential side of the plant (7), the density of the composite filter paper (8) is dense on both the outer circumferential side and the inner circumferential side, and the filtration performance is improved. and the replacement cycle of filter elements using this plant (7) becomes longer. Further, by forming the folded part α, the outer diameter of the plant (7) can be reduced to reduce the size without reducing the filtration performance.

Next, a second embodiment of the present invention will be explained based on FIG. In addition, the same parts as those explained in Fig. 1 and Fig. 2 are indicated by the same reference numerals, and the explanation is omitted (the same applies below).
. In this embodiment, a plurality of folded portions a1 are formed between the pleats (9).

Accordingly, the composite filter paper (8) at the outer periphery of the plant (7)
) can be made even denser, further improving filtration performance. Furthermore, further miniaturization can be achieved without reducing filtration performance.

Next, a third embodiment of the present invention will be described based on FIG. 4. In this embodiment, a plurality of folding members are formed between the flaps (9), and the folding depths of these folding parts (11) are varied in size. 7) from the inner circumference to the outer circumference of the composite filter paper (8).
) can be made almost uniform and dense, improving filtration performance. Furthermore, it is possible to achieve miniaturization without reducing filtration performance.

Effects of the Invention The present invention, as described above, involves folding a long filter paper in a zigzag pattern to form a large number of folds, rolling it into a cylindrical shape to form a plant, and inserting these folds between the folds on the outer periphery of the plant. Since the folded part is formed with a small folding depth, the density of the filter paper can be made as dense on the outer circumferential side of the plant as on the inner circumferential side, and therefore, the filtration performance can be improved. Furthermore, even if the outer diameter of the plant is reduced, a sufficient filtration area can be secured by forming the folded part, making the plant and the filter element using this plant more compact without reducing filtration performance. It has the effect of being able to achieve the following.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is an enlarged horizontal sectional view thereof, FIG. 3 is a horizontal sectional view showing a second embodiment of the present invention, and FIG. Figure 7...Plant, 8...
・Composite filter paper (filter paper), 9... pleats, 10... folding part Applicant Nippon Roki Co., Ltd. Figure 33, 7) IL diagram

Claims (1)

[Claims] A long filter paper is folded in a zigzag shape to form a large number of folds, and a cylindrical plant is provided, and these folds are also folded to a depth between the folds on the outer circumferential side of the plant. A filter element characterized by forming a folded part with a small diameter.