JPH0728893Y2 - Fold filter element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a filter element formed by pleating a sheet-shaped filter medium.

[Prior Art] Conventionally, as a filter paper type filter element used as an oil filter, an air filter, etc., the inner and outer surfaces of a sheet-shaped filter medium are alternately bent so that peaks and valleys are alternately continuous in the circumferential direction. It is known that a pleat group is formed to form a hollow, substantially tubular body as a whole. This type of filter element is generally widely used in which a filter chamber is formed by fixing end plates (end plates) that partition the inside and outside of the main body to both ends of the filter medium in the height direction of the main body. It is housed and used.

[Problems to be solved by the device]

In the conventional filter element as described above, the end plate fixed to the filter medium needs to have a size corresponding to the maximum outer diameter of the tubular body.

The present invention is an improvement to such a conventional fold-fold filter element to secure a wide filtration area, realize cost reduction by downsizing the end plate, and have excellent pressure resistance and shape retention. It is intended to provide an improved filter element.

[Means for Solving the Problems]

The present invention has solved the above-mentioned problems by improving the pleated structure of the conventional filter element.

That is, according to the present invention, the inner and outer surfaces of the sheet-like filter medium (1) are alternately bent to form a group of pleats in which peak portions (2) and valley portions (3) are alternately continuous in the circumferential direction to form a hollow body. In the substantially cylindrical filter element of (3), a triangular folding part (4) surrounded by a folded valley fold (4) and a folded mountain fold (5) between the crest (2) and the trough (3). 6) is formed, and a fold group (8) is formed on both sides in the height direction of the main body, the fold group (8) extending obliquely toward the inner peripheral side of the main body by the folding portion (6). .

〔Example〕

An embodiment of the filter element according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the filter element according to the present invention, and FIG. 2 is a development view showing the folds of the folds of the sheet-like filter medium 1, the solid line shows the fold formation folds, and the broken line shows the valleys. The fold forming folds are shown.

As shown in FIG. 2, a fold line for forming each fold is formed on the rectangular sheet-shaped filter medium 1 made of filter paper, non-woven fabric, etc., and the fold line is formed by bending the fold line according to each fold line. By winding and joining the longitudinal ends of the filter medium 1, the filter element body as shown in FIG. 1 is completed. As shown in FIG. 2, the rectangular sheet-shaped filter medium 1 is formed with crest forming folds 2a and trough forming folds 3a alternately in parallel in the longitudinal direction at regular intervals. The size of the filter medium, the crease spacing, etc. can be arbitrarily changed according to the purpose and application of the completed filter element. Between the ridge forming folds 2a and the valley forming folds 3a, a folded valley fold forming fold is formed from one point on the ridge forming fold 2a toward the valley forming fold 3a. 4a and the folding ridge 5a for forming the folding folds are formed, and the triangular folding portion 6 is formed. The folding fold forming folds 7a forming one side of the triangular folding portion 6 form a mountain portion by bending the folds. Triangular folding parts 6 are formed on both sides of the filter medium in the lateral direction (main body height direction). The position can be determined as needed, and three or more positions may be provided in the lateral direction. Then, by bending along each folding line to form a fold and winding this, a hollow cylindrical body main body as shown in FIG. 1 is formed. That is, by the triangular folding part 6 surrounded by the folding valley folds (4) and the folding mountain folds (5), two points between the short direction of the mountain portion (2) and the valley portion (3) which are alternately continuous are provided. A group of pleats 8 extending obliquely toward the peripheral side of the body is formed. In this embodiment, the folded-back portion 9 is formed at the end portion of the filter medium 1 in the lateral direction, but the treatment of the end portion is not particularly limited, and the folded-back portion 9 is further subjected to pleating. Alternatively, it may be cut.

In the filter element body configured as described above,
An end plate that separates the inside and the outside of the main body is fixed to the end of the tubular body in the height direction with an adhesive or the like to form a filter element.

[Effect of device]

According to the present invention, a group of pleats extending obliquely toward the inner peripheral side of the main body is formed on both sides in the height direction of the main body, and since the inner diameter of the mounting portion of the end plate can be reduced, the end plate is The size is small and the amount of adhesive is small, so the cost is low. In addition, since the bent corners are formed by the folds that extend in the diagonal direction, the pressure resistance and shape retention are also better than those of conventional products. And improved
It has the effect of extending the product life.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the filter element according to the present invention, and FIG. 2 is a developed view showing the fold line of the pleats of the sheet-shaped filter medium 1. 1 …… Sheet filter material, 2 …… Mountain part, 3 …… Tanibe part, 4 …… Folded valley folds, 5 …… Folded mountain folds, 6 …… Folded part, 8 …… Sloped folds

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F02M 37/22 J

Claims (1)

[Scope of utility model registration request] 1. A sheet-like filter medium (1) is alternately bent at its inner and outer surfaces to form a group of pleats in which crests (2) and troughs (3) are alternately arranged in the circumferential direction to form a substantially hollow body as a whole. In the tubular filter element, a triangular folded portion (6) surrounded by a folded valley fold (4) and a folded mountain fold (5) between the ridge (2) and the valley (3). And a fold group (8) extending obliquely toward the inner peripheral side of the main body by the folding section (6) is formed on both sides in the height direction of the main body.