JPH023765Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> The present invention relates to a filter element, and in particular, the present invention is a filter element in which a filter material made of two sheets of filter paper is wound spirally on the outer peripheral surface of an inner cylinder. The present invention relates to a filter element which is configured to be able to filter out even minute filter particles, and which can significantly suppress a decrease in filtration efficiency due to clogging.

<<Prior Art>> A conventional filter element is formed by bending a sheet-like filter material into a serpentine shape or a pleat shape. By the way, in order to be able to reliably filter out even minute filter particles with this type of filter element,
In addition to increasing the filtration area as much as possible,
It is necessary to make the distance through which the non-filtered body passes, that is, the filtration length, as long as possible. To this end, what has generally been done in the past is to first expand the filtration area by folding a sheet-like filter material into a bellows-like or pleat-like shape, and then folding such a bellows-like or pleated filter element. The idea was to connect multiple stages in series to ensure the seal length.

≪Problems that the invention seeks to solve≫ However, such a conventional configuration had the disadvantage that the shape of the element itself became large and the structure of the casing that housed the multiple stages of elements became complicated. . Furthermore, for example, when the oil filter element in the lubrication system of an automobile engine becomes clogged, it is common practice to replace the element together with the casing. In other words, most of these types of filter elements are disposable. Therefore, the configuration must be as simple as possible and cost-effective. However, with the conventional configuration as described above, it has been difficult to provide a low-cost filter element that is easily disposable.

In addition, in the case of conventional filter elements, the distance between the primary side and the secondary side is too large due to the intention of ensuring a large filtration length. was becoming difficult. For this reason, even though the filter element still has a filtration function, the pressure difference is not spread over the entire filter medium, and the filter element has often been forced to be replaced or discarded.

≪Means and actions for solving the problem≫ The present invention has been made in view of the above, and aims to simplify the structure of the element and casing and reduce costs, as well as to reliably separate even the minute filter particles. Furthermore, in order to maximize the pressure difference between the primary side and the secondary side and extend the service life of the element, the filter element is made by winding two sheets of filter paper in a spiral shape. , one of the filter papers is cut out in a substantially U-shape at predetermined intervals to form a plurality of alternating pillar parts and pocket parts, and at each location where the pillar parts and the other filter paper face each other, Provided is a filter element in which a groove is formed in one of the filter papers, the groove being orthogonal to the longitudinal direction of the filter paper, one end opening at one side edge of the filter paper, and the other end not reaching the other side edge. It is something to do.

<<Example>> Preferred embodiments of this invention will be described below with reference to the accompanying drawings.

Figures 1a, b, and c, Figures 2 and 3 show an embodiment of the filter element of the present invention, and the filter element 1 includes a sheet-like first filter paper 2 and a second filter
As shown in FIGS. 3 and 4, the filter papers 3 of
Turn it around.

The first filter paper 2 has a plurality of grooves 5 on one side (on the outer peripheral surface). Each groove 5 extends perpendicularly from one side edge of the filter paper 2 and terminates at a position that does not reach the other side edge.

The formation interval of each groove 5 is as shown in FIGS.
The spacing is set so that when the wires are wound around the inner tube 4 in the state shown in the figure, they are lined up on the same radial line.

Therefore, the distance between the grooves increases toward the outside. The grooves 5 are formed by compressing the filter paper using a press or the like. The second filter paper 3 consists of a base 3a and pillars 6 extending from the base 3a toward the other side edge.The pillars 6 are formed at positions corresponding to the grooves 5 of the first filter paper 2, and between each pillar 6. A substantially U-shaped pocket 7 is formed. Therefore, when the second filter paper 3 is superimposed on the first filter paper 3, the openings of each groove 5 (excluding the openings at the upper side edges) are closed by the corresponding pillars 6.

Here, the first filter paper 2 and the second filter paper 3 are fixed together with an adhesive, and a spacer may be inserted into the pocket 7 as appropriate. Further, the grooves 5 may be provided on both sides of the first filter paper 2 so as to form both sides of each column 6.

4a and 4b show another embodiment of the present invention, in which grooves 5 are formed on the back surface of the columns 6 of the second filter paper instead of forming the grooves on the first filter paper 2. This is different from the example.

FIG. 5 shows an example of the use of the filter element 1 of the present invention, in which the element 1 is used as an oil filter used in the lubrication system of an internal combustion engine, and the element 1 is applied to a so-called bypass element 23. be done. The oil filter 10 is generally composed of a mounting base 12 fixed to an engine main body side (not shown), and a cartridge type oil filter main body 13 detachably mounted on the mounting base 12.

The mounting base 12 is fixed to the engine body side (not shown), and has an inlet port 14 for introducing oil into the casing of the oil filter body 13, a full flow outlet port 15, and a bypass outlet port 1.
6.

A tubular full flow passage 17 is disposed in the full flow outlet port 15 of the mounting base 12, a tubular male threaded member 18 is fitted on the outer periphery of the full flow passage 17, and a full flow passage is provided inside the male threaded member 18. Outside of 17 the bypass outlet port 16 is defined. Bypass outlet port 1
6 is connected to the oil pan.

The Orfilter main body 13 includes a cylindrical casing 1 with a sealed structure and a base plate 20 at the lower end.
1, a full flow element 22 and a bypass element 23 that are housed vertically within the cylindrical casing 11.

A male screw member 18 is provided on the inner periphery of the base plate 20.
Female threaded portion 2 that is screwed together with the upper threaded portion 18b on the outer periphery
0a is formed, and the female threaded part 20a is connected to the upper threaded part 1.
8b, the entire oil filter main body 13 is configured to be removably mounted on the mounting base 12.

A plurality of openings 25 that communicate between the inlet port 14 and the inside of the casing 11 are formed through the plate surface of the base plate 20, and a check valve 25a that is opened and closed by the flow pressure of oil is provided.

The full flow element 22 has a relatively coarse filter paper, takes in oil introduced into the cylindrical casing 11 from the outer circumference, guides it to the inner circumference of the inner cylinder 27, and has a tubular structure communicating with the inner circumference 27. It is configured to discharge into the full flow passage 17.

The bypass element 23 is located between the full flow element 22 and the base plate 20.
It is arranged coaxially outside the full flow passage 17. The bypass element 23 is held between an inner cylinder 30 with one end open and the other end bent outward, and an outer cylinder 31 with one end open and the other end bent inward. An inverted cup-shaped cylindrical body 34 is fixed therebetween to form a space 37 between the lower end of the bypass element 23 and the outer cylinder 31, and a through hole 36 is bored in the cylindrical body 34 to form a bypass outlet. The port 16 and the space 37 are communicated with each other.

Note that numerals 40 and 35 shown in the figure are packing for separating the primary side and the secondary side of the elements 22 and 23.

In the above configuration, in the oil filter 10 shown in FIG. 5, the oil supplied into the cylindrical casing 21 from the inlet port 14 through the opening 25 of the base plate 20 passes through the full flow element 22 as one path. It is filtered and reaches the full flow outlet port 15, and is supplied to the engine and other lubricating parts from the port 15. It also passes through the bypass element 23 as the other route, reaches the bypass outlet port 16, and is returned to the oil pan (not shown). It can be done.

In the bypass element 23, oil enters the pocket 7 as shown by the arrow in FIG.
Furthermore, it penetrates into each of the filter papers 2 and 3 from both sides of the first filter paper 2 and the base 3a of the second filter paper 3, which are the filter materials, and moves inside the filter papers 2 and 3 to the secondary side. exits into the space 37 from the end on the side where is located.

At this time, the fine filtration particles contained in the oil are
When the oil passes through the filter papers 2 and 3, it is filtered out.

Since the impurities filtered out during the passage of the oil accumulate and are retained in the pocket 7, the space in which the impurities accumulate increases and the filtration efficiency improves. Also, Pocket 7
By providing the filter paper 3, the distance between the primary side and the secondary side becomes the width of the base 3a, and each column 6 has a groove 5 with one end communicating with the secondary side. The negative pressure on the next side is effectively transmitted to the entire surface of the pocket 7 via the groove 5 (including the case shown in FIG. 4), further increasing the efficiency of utilizing the pressure difference. In addition, since the groove 5 formed by compression using a press or the like has a higher density of filter paper elements on the bottom surface,
This makes it difficult for liquid to penetrate in the direction across the groove 5. Therefore, part of the filtrate that permeates through the filter papers 2 and 3 is inside the groove space defined by the groove 5 and the second filter paper 3 (first filter paper 2 in FIG. 4). 2
It flows toward the next side, functions as a passage for the filtrate, and allows the filtrate to permeate and pass through smoothly.

The example of use of the filter element of the present invention is not limited to that shown in FIG. 5, but it can also be used as a high-precision filter element that needs to filter out particularly fine dust.

<<Effects of the invention>> As described above, the filter element of the present invention not only simplifies the structure of the element and casing and lowers costs, but also reliably separates even the minute filter particles, and further improves the efficiency between the primary side and The service life of the element can be extended by making maximum use of the pressure difference between the secondary sides.

[Brief explanation of the drawing]

Figures 1a, b, c to 3 show one embodiment of the present invention, and Figures 1a, b, and c are sectional views taken along line X-X of the first filter paper, second filter paper, and a. 2 is a cross-sectional view of the filter element, FIG. 3 is a vertical sectional view, and FIG. 4 a and b are other embodiments of the present invention and their Y-
The Y cross-sectional view and FIG. 5 are explanatory diagrams showing an example of the use of the filter element of the present invention. DESCRIPTION OF SYMBOLS 1... Filter element, 2... First filter paper, 3... Second filter paper, 3a... Base, 4... Inner cylinder, 5... Groove, 6... Pillar, 7... Pocket.

Claims (1)

[Claims for Utility Model Registration] (1) A filter element in which two sheets of filter paper are wound in a spiral shape, with approximately U-shaped notches placed at a predetermined interval on one side of the filter paper and arranged alternately. A plurality of pillar parts and a pocket part are formed in succession, and at each point where the pillar part and the other filter paper face each other, a pocket part is formed, which is perpendicular to the longitudinal direction of the filter paper, and one end is attached to one side edge of the filter paper. A filter element characterized in that one of the filter papers is formed with a groove that is open and whose other end does not reach the other side edge. (2) The spiral filter element is formed at intervals such that each of the pillar portions forms a line along the radial line, as set forth in claim 1 of the utility model registration claim. filter element.