JPS62129116A - Filter element - Google Patents

Abstract

PURPOSE:To enhance the filter performance and prepare an element of long life by disposing a plurality of ribs in a row crossing rectangularly a straight line passing through the center of element. CONSTITUTION:A plurality of ribs 13 are provided in a row crossing rectangularly a diametral line (d) passing through the center of element 12. An imaginary line (i) formed with each of the outer ends of the said ribs 13 forms a circular arc, and the unit rib row (u) formed with a plurality of ribs 13 are formed opposedly facing the said diametral line (d). By the said arrangement, the spaces between the ribs formed on the filter element 12 can be narrowed to form lots of ribs and enlarge filter area. Thus, the element having a higher filter performance and a longer life can be prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filter element, and particularly to a filter element used in an oil filter for internal combustion engines or a line filter for hydraulic piping.

[Conventional technology]

Oil filters for internal combustion engines and line filters for hydraulic piping are used to remove dust mixed in circulating oil.

The filter usually has a structure in which a cartridge-shaped filter element formed by folding paper is housed in an airtight container made of metal.

Conventional filter elements are made by winding paper into a cylindrical shape or forming pleats bent into a mountain shape, as shown in Figures 7 and 8 (Figure 7 is a perspective view and Figure 8 is a plan view). The cylindrical element 1 has a chrysanthemum-shaped cross section, and oil, which is the fluid to be filtered, flows from the outer end to the inner end of the cylindrical element 1 as shown by the arrow. At this time, the oil is filtered by the Niremen l-1, and only clean oil from which dust has been removed is discharged from the outlet 2 of the element 1.

(Problems to be Solved by the Invention) However, in the filter element formed in a chrysanthemum shape as described above, the chevron-shaped folds are formed radially from the center, as shown in the plan view of FIG. Therefore, the interval W between the folds formed on the outer end side increases as the diameter of the outer cylinder of the filter element increases.As a result, it is not possible to form a large number of pleats, and the filtration area is reduced. There was a problem that it was not possible to move the filter element back many times.Also, when trying to reduce the diameter of the inner cylinder of the filter element to increase the excess area, the folds formed on the inner end side interfere with each other. It was not possible to increase the number of pleats, and it was not possible to increase the filtration area of Kyu 8Z.

Roughly speaking, if the filter paper is formed in a chrysanthemum shape as shown in FIG. 1, as the Ti permeating fluid enters from the outer end to the inner end, it will be gradually narrowed down and the flow path area will decrease.
The flow velocity of the fluid to be filtered is gradually increased, that is, the flow velocity in each part of the element is not uniform, so the flow path resistance on the Niremen 1i door paper is not uniform, and the flow rate partially passes through the door paper. There is a problem that uniform filtration is impossible due to the difference in the

The present invention was devised in view of the above circumstances, and its purpose is to achieve improvement in filtration performance by expanding the filtration area and to maintain good filtration performance over a long period of time. The objective is to provide a filter element that can

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a filter element formed by forming a large number of pleats or winding a core into a cylindrical shape, in a direction perpendicular to at least one diameter line passing through the center of the element. The invention is characterized in that a plurality of pleats are arranged in a row, and unit pleat rows are formed facing each other, with imaginary lines formed at the outer ends of these pleats having an arc shape.

[For production]

The filter element according to the present invention has a plurality of folds arranged in a row in a direction perpendicular to at least one diameter line passing through the center of the element, thereby reducing the interval between the folds formed on the outer end side. Therefore, a large number of pleats can be formed, and a large filtration area can be obtained. As a result, filtration performance can be improved, and a longer life can be achieved by increasing the filtration area. Moreover, it is possible to suppress the phenomenon in which the flow velocity increases as the fluid to be filtered enters from the outer end of the element to the inner end, so a uniform flow velocity can be maintained in each part of the element, enabling uniform filtration. .

(Embodiment of the Invention) Hereinafter, an embodiment of a filter element according to the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 shows a sectional view of the oil filter, and the oil filter 10 includes an oil filter case 11, a filter element 12 housed in the oil filter case 11, and a bottom cover 15 that supports the filter element 12. and a reinforcing inner cylinder 16 of the element.

The filter element 12 is made by folding a sheet of door paper to form a large number of pleats and winding it into a cylindrical shape; a plurality of folds 1 in a direction perpendicular to at least one diameter line d passing through the center of 12;
3 are arranged in a row. The imaginary line i formed by each outer end of the plurality of pleats 13 has an arc shape, and the plurality of pleats 1
The unit pleat row U composed of 3 is formed opposite to the diameter line d. Here, FIG. 3 shows a case where a plurality of grooves 13 are arranged in a row in a direction perpendicular to a diameter line d passing through the center of the filter element 12.
The figure shows a case where a plurality of pleats 13 are arranged in a row in directions perpendicular to two mutually orthogonal diameter lines d passing through the center of the filter element 12, and each unit pleat row U constituted by a plurality of pleats 13. are formed opposite to the diameter line d.

The distance W between adjacent flaps 13.13 of the filter element 12 shown in FIGS. 3a3 and 4 is constant, and this distance W is set to a relatively small dimension. Moreover, since the slope of the pleats from the outer end to the inner end of the element is gentle, the rate of decrease in the flow path area from the outer end to the inner end is set small.

Next, the operation of the filter element according to the present invention configured as described above will be explained.

In FIGS. 1 and 2, oil sucked in from the oil intake port 15 formed in the bottom cover 15 of the oil filter 0 flows into the oil filter case 11 via the check valve 17 as shown by the arrow. . Then, the oil flows from the outer end of the filter element 12 toward the inner end, passes through the filter element 12, and flows into the center of the oil filter case 11. At this time, clean oil from which dust has been removed by being filtered by the filter element 12 is passed through the oil outlet 11 at the bottom of the oil filter.
It is sent to the lubrication process from o.

〔Experimental result〕

Next, experimental results of the filter element according to the present invention will be explained in comparison with a conventional filter element. The filter element is made of 80% link material and 20% rayon.
%, paper thickness 0.85M, density 0.18g/cd filter paper.

The oil filter used in the experiment has an outer diameter of φ65 and a height of 6
It is 5#. The outer diameter of the filter element installed inside this oil filter is φ59, the outer diameter of the reinforcing inner cylinder of the element is φ27, and the element height is 49#.

The table below compares the conventional filter element (illustrated in FIG. 7) formed with a chrysanthemum-shaped cross section and the filter element according to the present invention (illustrated in FIGS. 3 and 4) under the above design conditions. do. Note that the interval (pitch) between the folds of the filter element is 2.5M on the inner end side.

As is clear from the table above, the conventional filter element cannot secure a filtration area of 435 ci Ll, but the filter element of the present invention, as shown in Fig. 3, has a filtration area of 698 cd,
The one shown in Fig. 4 has an excess area of 567 ci, and both can increase the excess area by about 50% compared to the conventional type.

Next, using the above filter element, JISD3904
Performance tests were conducted under the conditions shown below. The oil used at this time was an additive-free oil equivalent to SAE #30, and the oil temperature was 80°C.
The test flow rate is 10 fi/min.

Figures 5 and 6 show the results of this experiment.

FIG. 5 shows the change in filtration efficiency with respect to elapsed time. In the figure, the horizontal axis represents the elapsed time (flour).
, the vertical axis represents the filtration efficiency (%), the broken line represents the conventional filter element, and the solid line represents the filter element of the present invention. As is clear from Figure 5, i
The filtration efficiency of the element of the present invention is approximately 5% higher than that of the conventional element.

Moreover, FIG. 6 shows the change in pressure loss with respect to elapsed time, and in the figure, the horizontal axis represents the elapsed time (llo
ur), the vertical axis is the pressure loss (Ky/cd),
The broken line shows the conventional filter element, and the solid line shows the filter element of the present invention. As is clear from FIG. 6, the pressure loss of the element of the present invention is dramatically reduced over time compared to the conventional element.

〔Effect of the invention〕

As is clear from the description of the embodiments above, according to the present invention, the interval between the folds formed on the filter element can be narrowed, so a large number of folds can be formed, and the filtration area can be increased. It can be made large. As a result, the filtration performance can be improved, and since the amount of dust collected per unit area of the filter paper is constant, the life of the element is extended by the increase in the filtration area.

In the present invention, in a comparison where the filtration flow is the same, the flow rate passing through the element becomes slower as the filtration area increases, resulting in an increase in filtration efficiency.

Furthermore, according to the present invention, it is possible to prevent the flow rate from increasing as the fluid to be filtered enters from the outer end side of the element to the inner end side of the element, so that a uniform flow rate can be maintained in each part of the element, resulting in uniform filtration. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a front view of the right half of an oil filter equipped with a filter element according to the present invention. Figure 2 is a cross-sectional plan view of the right half of the same oil filter.
3 and 4 are plan views of the filter element according to the present invention, FIG. 5 is a diagram showing the filtration efficiency of the filter element, FIG. 6 is a diagram showing the pressure loss of the filter element, and FIG. 7 is a diagram of the conventional filter element. FIG. 8 is a perspective view of the filter element, and FIG. 8 is a plan view of the filter element. DESCRIPTION OF SYMBOLS 10... Oil filter, 11... Oil filter case, 12... Filter element, 13... Crease, 15... Bottom cover. Applicant's agent: Sato-O No. 1, No. 2, 83, Fig. 4, Moema (Hour), No. 5, Elapsed time (Hour), Fig. 6, Funeral drawing, Fig. 8, Procedures, No. 11, Seisho Showa February 3, 61

Claims (1)

[Claims] In a filter element formed by winding a filter paper with many pleats into a cylindrical shape, a plurality of pleats are arranged in a row in a direction perpendicular to at least one diameter line passing through the center of the element. A filter element characterized in that unit pleat rows are formed facing each other with virtual lines formed at each outer end having a circular arc shape.