JPS6115922Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a filter laminate in which a large number of flat filter paper elements are laminated.

Conventionally, filters that use as filter media an assembly of a large number of laminated filter paper elements with circular or polygonal outer contours have been used to filter lubricating oil in internal combustion engines, etc., and are particularly useful for ensuring the amount of filtrate. It is used where high-quality oil with few impurities is required, and its purpose is to maintain the properties of the oil.

However, this type of conventional filter laminate has the following drawbacks.

In other words, when a large number of filter paper elements of the same shape are stacked, the liquid to be filtered hardly passes through the thickness direction of the filter paper elements, and the liquid is filtered before the filtering capacity of the elements is sufficiently exhausted.
The amount of filtration became extremely small and had to be discarded.

For this reason, various improvements have been made to the shape of the filter paper element, for example, as shown in Japanese Patent Application Laid-Open No. 55-24591, it is an outlet for the filtrate. An apple-shaped opening is formed separately from the central through-hole, but even in this case, the average pore size in the thickness direction of the laminated filter paper elements is the same, and the relatively coarse pore size is used. If a filter paper element is used, the dust collection efficiency is low in the initial state, and the properties of oil, which is the purpose of this type of filter, cannot be maintained well.On the other hand, if a filter paper element is used with a relatively dense pore size, ,
Although the oil after filtration is of good quality, there is a problem in that the filtration passage becomes clogged with dust etc. in a short period of time, and as a result, it becomes impossible to secure the amount necessary to maintain the properties of the oil as a whole.

This idea was devised in view of the problems of conventional laminated filters as mentioned above, and its purpose is to fully utilize the filtration capacity of each laminated element, and also to provide lubricating oil for internal combustion engines. An object of the present invention is to provide a filter laminate suitable for the intended use of a laminate type filter, which maintains the properties of oil in good condition.

Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

1 to 4 show an embodiment of a filter laminate according to this invention.

The filter laminate 10 shown in the figure is composed of a first filter paper element 12 as shown in FIG. 1 and a second filter paper element 14 as shown in FIG.

The first filter paper element 12 has a circular outer peripheral outline, and a circular through hole 16 is bored approximately in the center thereof.

The second filter paper element 14 has a circumferential portion 18 formed to surround a through hole 16' having approximately the same shape as the through hole 16 of the first filter paper element 12.
A plurality of radial protrusions 20 are formed extending from the circumferential portion 18 at equal intervals in the radial direction, and the second filter paper element 1 including the radial protrusions 20
The outer shape of filter paper element 4 is approximately the same as the outer shape of the first filter paper element 12 described above.

Then, the filter laminate 10 is formed by alternately stacking the first filter paper element 12 and the second filter paper element 14 so that the first filter paper element 12 is located on the outside (see FIG. 3). ), vertically adjacent first filter paper elements 12
A residue reservoir 22 is formed between the radial projections 20-20 of the second filter paper element 14 held by the filter paper elements 12-12.

Furthermore, the average pore size of the first filter paper element 12 in the thickness direction is larger than the average pore size of the second filter paper element 14.

Filter laminate 10 configured as described above
When oil such as lubricating oil to be filtered flows into the outer circumference of the filter, in the initial state, the oil flows in the direction of the arrow in FIG. be done.

This is because the filtration distance that permeates the inside of the filter paper is the shortest, so the dust mixed in the oil is removed from the circumferential portion 18 of the second filter paper element 14.
The residue starts to accumulate from the end face of the
However, if dust accumulates to a certain extent, filtration becomes difficult, so as shown by the arrow in FIG. Filtration that passes through the interior of the first filter paper element 12 or filtration that passes through the radial protrusions 20 of the second filter paper element 14 begins, and dust accumulates in the residue reservoir portion 22 in a parabolic state. When the residue accumulation portion 22 is filled with dust, the filtration capacity of the first and second filter paper elements 12 and 14 is almost exhausted.

Therefore, when the filter laminate is used in a cartridge type filter, it can be replaced very economically.

Further, the above-mentioned filter paper elements 12, 14 are provided with one end communicating with the above-mentioned through hole 16, 16' and extending in the radial direction of each filter paper element 12, 14, as shown in FIGS. 1 and 2. If the radial grooves 24, 24' are formed by press working or the like, the primary side, which is the outer peripheral part of the filter laminate 10, and the through holes through which filtered oil, etc. are sent outside. This is desirable because the pressure difference on the secondary side that vertically communicates the filter paper elements 12, 16' can be applied over substantially the entire surface of the filter paper elements 12, 14.

Furthermore, the filter laminate 10 has the first
The average pore size in the thickness direction of the filter paper element 12 is made larger than the average pore size of the second filter paper element 14. As an example, FIG. , the second filter paper element is 8μ (curve A), the first and second filter paper elements 12, 14 are 18μ (curve B), and the first and second filter paper elements 12, 14. 8
The dust collection efficiency and filtration amount of each sample having a pore size of μ (curve C) are measured over time.

The measurement method is to apply a predetermined amount of dust with a predetermined particle size of 1μ.
A circulation system is created in which the oil is poured into 10G oil and passed through a stack of filters made of the same number of filters.The oil is circulated within this system using a pump, and the amount of dust in the oil is measured at predetermined intervals to determine the collection efficiency. The amount of filtration is measured using a flowmeter.

As is clear from the measurement results shown in the figure, the collection efficiency shown in the upper row is due to the fact that in the initial stage, most of the oil passes through the second filter paper element 14 as described above, and the pore size of this is dense. , the oil after filtration is much better than with all of elements 12, 14 having a relatively coarse pore size (curve B), and the efficiency increases over time, with all of elements 12, 14 having a relatively coarse pore size (curve B). The collection efficiency does not decrease as it does with a relatively dense pore size (curve C).

The filtration amount shown in the lower part of the figure is initially set to 18μ for elements 12 and 14 (curve B).
Although it gradually decreases over time, the required amount is maintained in a relatively stable state.

Combining these results, it can be concluded that the filter laminate in which the elements 12 and 14 are configured with pore sizes of 13μ and 8μ, which is an example of the present invention, maintains high dust collection efficiency and achieves the required amount in terms of quantity. This shows that it is possible to secure sufficient amounts.

In addition, in the above embodiment, the elements 12 and 14
Although the outer circumferential contour of is described as being circular, it is of course possible to make it polygonal or to make the through holes 16, 16' in the center polygonal. The pore sizes of the filter paper shown in the above embodiments are preferably within the range of 10 to 18 microns for the first filter paper element 12 and 6 to 8 microns for the second filter paper element 14.

The reason for this is that, as mentioned above, in the initial state, oil flows through the second filter paper element 14, so if the pore size is less than 6 microns, the initial total amount of filtered oil will be insufficient, and if the pore size is 8 microns or more, the amount of filtered oil will be insufficient. Quality deteriorates.

On the other hand, if the pore size of the first filter paper element 12 is set to 10 microns or less, clogging occurs early and the life becomes too short.
This is because if the diameter is more than microns, problems will arise with the quality of the filtered oil.

As explained in detail in the embodiments above, this invention has a laminated body used in a laminated filter in which a circular or polygonal first filter paper element and a second filter paper element provided with radial protrusions are alternately arranged. The first filter paper element is laminated to form a residue reservoir between adjacent first filter paper elements, and the average pore size of the first filter paper element is larger than that of the second filter paper element. In addition, it is possible to fully utilize the filtration capacity of each layered element, and it is possible to obtain a filter laminate suitable for the purpose of use of a filter using this type of laminate.

[Brief explanation of the drawing]

1 to 4 show an embodiment of this invention, in which FIG. 1 is a perspective view of the first filter paper element, FIG. 2 is a perspective view of the second filter paper element, and FIG. 3 is a perspective view of the second filter paper element. FIG. 4, which is a partial cross-sectional view of the filter stack, is a characteristic diagram showing the collection efficiency of the filter stack in the upper row and the filtration amount in the lower row. 10... Filter laminate, 12... First filter paper element, 14... Second filter paper element, 1
6, 16'...Through hole, 18...Circumferential part, 20...
Radio station radial projection piece, 22... Residue reservoir part, 24...
...Radial concave groove.

Claims (1)

[Claims for Utility Model Registration] (1) The liquid to be filtered flows into the outer periphery of a laminate made of a large number of plate-shaped filter paper elements with a through hole in the center, and the filtrate flows through the through hole. In the filter, the laminate includes a first filter paper element having a circular or polygonal outer peripheral outline, and radial protrusions extending at equal intervals in the radial direction from a circumferential portion surrounding the through hole in the center. and a second filter paper element provided with strips are alternately stacked, the diameter of the radial protrusion of the second filter paper element is substantially the same as the outer diameter of the first filter paper element, and A residue reservoir is formed between the radial protrusions of the second filter paper element sandwiched by the adjacent first filter paper element, and the average of the thickness direction of the first filter paper element is A filter laminate characterized in that the pore size is larger than the average pore size of the second filter paper element. (2) Utility Model Registration Scope of Claim 1 The product described in claim 1 is characterized in that the first filter paper element has a pore size of 10 to 18 microns, and the second filter paper element has a pore size of 6 to 8 microns. filter laminate.