JPS6229051Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is used for air cleaners for automobile engines,
This invention relates to improvements in filter paper type filter elements used in filtration devices such as oil filters and fuel filters.

《Prior art and its problems》 As is well known, the conventional filter element used in the above-mentioned filtration device is formed by folding a long strip of filter paper multiple times at a certain length to form a bellows shape. The filter paper is erected between parallel donut-shaped end plates so as to form a hollow cylinder as a whole. In other words, the first
As shown in the figure, a large number of continuous rectangular filter papers 2, 2, . . . are arranged in a chrysanthemum shape through bent ridges 1, 1, . It is erected in the shape of a cylinder 4.

In this type of filter element, in order to increase the filtration area, the outer diameter R1 of the hollow cylinder 4 is
by increasing the inner diameter R2 and increasing the area of each filter paper 2, 2, . . . and by increasing the arrangement density of each filter paper 2, 2, .
2. There is a means to increase the number of... If the above-mentioned dimensions R1 and R2 are limited by other factors, the latter method must be used exclusively.

Even if the arrangement density of filter papers is increased, it is necessary to leave a gap between adjacent filter papers to allow good circulation of the fluid to be filtered. This provides an upper limit on the filter paper array density.

In the conventional chrysanthemum-like element shown in Figure 1,
The filter papers 2, 2, ... are arranged almost radially and are point symmetrical with respect to the center, so the arrangement pitch P1 of the folded ridges 1, 1, ... on the inner circumference side is the outer circumference. Its arrangement pitch on the side is smaller than P2. In other words, the arrangement density of the filter papers 2, 2, . . . is higher on the inner circumferential side and lower on the outer circumferential side.

Therefore, even if the arrangement density of filter papers 2, 2, ... is set to the maximum allowable value on the inner circumference side, the filter paper arrangement on the outer circumference side will be coarser than on the inner circumference side, so there will be no waste on the outer circumference side. It creates space.

A situation in which such wasted space occurs is shown, for example, in Japanese Patent Publication No. 57-39808, and in the filter element disclosed in this publication, the filter paper is arranged in parallel in a plurality of areas divided in the circumferential direction. A wedge-shaped support element is fitted into the wedge-shaped part that is formed when the parts are gathered together.

However, in the element disclosed in the same publication, the wedge-shaped support element is made of a non-permeable metal material or plastic material, and therefore the filtration area cannot be increased as in the conventional chrysanthemum-shaped element described above.

[Purpose of the invention] The purpose of this invention is to eliminate the difference in the arrangement density of the filter paper in the hollow cylindrical space, eliminate any wasted space, and effectively increase the filtration area by increasing the arrangement density of the filter paper. An object of the present invention is to provide a filter element that can be increased in size.

<<Structure of the invention>> The filter element of the present invention achieves the above object by dividing the hollow cylinder into four or more parts in the radial direction, making the filter paper arrangement in each partial region rotationally symmetrical, and A starting filter paper on one end side included in the area is located on a radial line, and each of the filter papers connected thereto are arranged in parallel with a constant interval, and are connected to the starting filter paper on the radial line of another adjacent partial area. It is said that

<<Embodiment>> FIG. 2 shows a filter element according to an embodiment of the present invention. In the filter element shown in this figure, a large number of rectangular filter papers 12, 12, . These filter papers 12, 1
The basic structure is the same as the conventional one, in that the space occupied by 2... forms the hollow cylinder 14 as a whole.

The arrangement pattern of the filter paper 12 in this embodiment is divided into four equal parts 14a, 14b, 1 by dividing the hollow cylinder 14 at 90 degrees each on a virtual plane in the radial direction.
It is set separately into 4c and 14d. The filter paper arrangement in each of the partial regions 14a to 14d has a rotationally symmetrical pattern, with the angles only changed by 90 degrees.

In each of the partial areas 14a to 14d, the filter papers 12, 12, . The starting end is connected to the filter paper on the radial line of the partial area. Bent ridge 1
1 does not have a sharp edge as shown in Figure 1,
The filter paper 12 has a gentle ridge forming a cylindrical surface, and adjacent filter papers 12 are erected in parallel with a distance d between them.

The lengths between the two opposing folded ridges 11 and 11 in the rectangular filter paper 12 are not equal, and gradually increase and decrease as shown in the figure in accordance with the partition planes forming each of the partial areas 14a to 14d.

In addition, the ends of the filter paper 12 located at both ends of adjacent partial regions have a connecting portion 1 that forms a substantially right-angled ridge.
5 in a row.

In this embodiment, each portion obtained by dividing the hollow cylinder 14 into four equal parts is a unit of the filter paper arrangement pattern.
The present invention is not limited to this, and the filter paper arrangement pattern may be set in four or more partial areas. In any case, according to the present invention, the arrangement density of the filter papers 12, 12, . . . can be made uniform over the entire area of the hollow cylinder 14.

<<Effects of the invention>> As explained in detail above, in the filter element according to this invention, the arrangement density of the filter papers in the hollow cylindrical space becomes uniform, and by increasing this arrangement density, the overall filtration area can be increased compared to the conventional filter element. It is clearly larger than that of the same size.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional filter element, and FIG. 2 is a schematic diagram of a filter element according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11...Bending ridge part, 12... Filter paper, 13... End plate, 14... Hollow cylinder, 15... Connection part.

Claims (1)

[Scope of utility model registration request] A filter element in which a large number of rectangular filter papers, connected via folded ridges, are densely arranged vertically between two parallel end plates, and the space occupied by these filter papers forms a hollow cylindrical shape as a whole, and the filter paper arrangement in each partial region obtained by dividing the hollow cylinder into four or more partial regions by imaginary planes in the radial direction is rotationally symmetrical, and the starting filter paper included therein is located on a radial line and each filter paper connected to it is arranged in parallel at a constant interval and connected to the starting filter paper on the radial line of another adjacent partial region.