JPH05285312A - Filter element - Google Patents

Abstract

PURPOSE:To improve the filter performance of a filter element by folding both the end edges along the zigzag folding direction of a filter paper, winding both the folded parts inwards and sticking abutted surfaces of both the folded parts to each other. CONSTITUTION:A slender filter paper 7a is prepared and both its end edges along the longitudinal direction are folded on the same side to form folded parts 12. Next, the filter paper 7a is folded in a zigzag in the longitudinal direction to form a wall of the prescribed size. Further, when the filter paper 7a is wound and abutted surfaces 12a of both the folded parts 12 are stuck to each other and both the ends are joined by an adhesive, the filter paper 7a is turned into a filter medium 7 in the form of a cylinder. And the filter medium 7 has a lot of walls regularly arranged on both the inner and outer peripheries. And since inside each wall, the folded parts 12 are interposed in each wall, the filter papers 7 are separated a little not attached to each other and so the filter medium has small resistance and excels in permeability of fluid. Filter medium fixtures 8, 9 consist of ring plate parts 8a, 9a and cylindrical projected parts 8b, 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element for filtering fluid such as oil and air.

[0002]

2. Description of the Related Art As shown in FIG. 11, a conventional filter element for filtering oil or the like is a filter medium fixing tool 2, which is a ring-shaped plate on the upper and lower end surfaces of a filter medium 1 having a cylindrical contour. 3 is adhered, and annular elastic bodies 4 and 5 made of rubber or the like are adhered to the surfaces of the filter medium fixing tools 2 and 3.

As shown in FIG. 12, the filter medium 1 is formed by bending a filter paper 1a in a zigzag shape (A in the same figure) and winding it in a tubular shape (B in the same figure), and using metal fittings 6 or the like at both ends thereof. Made by sticking.

[0004]

However, the filter medium 1 of the conventional filter element described above is formed by simply zigzag folding and winding a sheet-shaped filter paper 1a as shown in FIG. When adhering to the filter medium fixing tools 2 and 3, the inside of the folds of the filter medium 1 is not uniform. Filter medium 1
If the folds are uneven and the pitch is non-uniform, the filtration performance is deteriorated.

Further, in order to divide the filter medium 1 into a dust side and a clean side, the upper and lower end surfaces of the cylindrical filter medium 1 are
It is necessary to seal the entire surface with the filter material fixing tools 2 and 3 and the adhesive. For this reason, as shown in FIG. 11, when used as a filter element, a dead zone a which does not contribute to the filtration of the fluid occurs.

An object of the present invention is to solve the above problems.

[0007]

In order to solve the above-mentioned problems, the first aspect of the present invention provides a filter element having a filter medium formed by zigzag-folding a filter paper and winding the filter paper in a tubular shape. Both ends along the zigzag fold direction are bent, and the two folded pieces are wound inside, and the contact surfaces of the bent pieces are adhered to each other. The invention of 2 adopts the constitution of the filter element in which the filter medium fixing tool having a diameter smaller than the outer diameter of the end face is adhered to both end faces of the filter medium in the 1st invention, and the 3rd aspect of the present invention is The filter medium fixing device in the second aspect of the invention employs a structure of a filter element in which the abutting surfaces of the bent pieces of the filter medium are adhered to each other by the elastic sealing agent and the same elastic sealing agent.

[0008]

In the first aspect of the present invention, both ends of the filter paper along the zigzag direction are bent and the abutting surfaces of the bent pieces are adhered to each other, so that the filter paper is wound into a tubular shape. In this case, the folds of the filter medium are arranged at a constant pitch not only on the outer circumference but also on the inner circumference. Therefore, the entire area of the filter paper can be used as the filtration area, and the fluid is spread over the entire surface of the filter paper, so that the filtering performance is improved.

Further, since the contact surfaces of the bent pieces are adhered to each other, if the inner peripheral surface of the tubular filter medium is the clean side, the other outer peripheral surface and both end surfaces are used as the dust side. be able to.

In the second aspect of the invention, since the filter medium fixing tool having a diameter smaller than the outer diameter of the end faces is adhered to both end faces of the filter medium, the fluid can also pass through the both end faces of the filter medium. Therefore, the dead zone is reduced and the filtration efficiency is improved.

In the third aspect of the present invention, since the filter medium fixing member is formed of the elastic sealant, when the filter element is loaded in the case, it is elastically supported in the case without using the sealant separately. And, the sealing property can be secured. Further, since the contact surfaces are adhered to each other by the same elastic sealant, the adhering and the molding of the filter medium fixing tool can be performed at the same time, and the manufacturing process of the filter element can be simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a filter element according to the present invention will be described below with reference to the drawings.

Embodiment 1 As shown in FIGS. 1, 2 and 3, the filter element 6 comprises a cylindrical filter medium 7 and filter medium fixing tools 8 and 9 adhered to both end faces of the filter medium 7. , And sealing members 10 and 11 adhered to the filter medium fixing tools 8 and 9.

In the filter material 7, the filter paper 7a is zigzag-folded,
In addition, it is wound in a cylindrical shape, and the end face has a chrysanthemum shape. This filter medium 7 is manufactured by the process as shown in FIG.

That is, first, an elongated filter paper 7a is prepared,
Both edges along the longitudinal direction are bent to the same side to form a bent piece 12 (Fig. 4A). Next, the filter paper 7a is zigzag-folded in the longitudinal direction to form folds of a predetermined size (FIG. 4B).

Then, the filter paper 7a is wound so that both the bent pieces 12 are located inside. Further, prior to winding, an adhesive is applied to the exposed surface to be the contact surface 12a of both bent pieces. As this adhesive, solvent adhesive, pressure sensitive adhesive,
Either a heat sensitive adhesive or a reactive adhesive may be used.

The filter paper 7a is wound, and both the bent pieces 12 are wound.
The filter paper 7a becomes the cylindrical filter material 7 by adhering the contact surfaces 12a of the above and fixing both ends with stoppers (not shown) or joining them with an adhesive. The filter material 7 has a large number of folds regularly arranged on both the inner circumference and the outer circumference thereof. In addition, since the folding pieces 12 are provided inside each of the folds, the filter papers 7a are slightly separated from each other without adhering to each other. Therefore, the resistance is reduced and the fluid permeability is excellent.

The filter medium fixing tools 8 and 9 include ring-shaped plate portions 8a and 9a and a cylindrical protruding portion 8 provided on the inner periphery thereof.
b and 9b. These filter medium fixing tools 8 and 9 are
The plate portions 8a and 9a are brought into contact with the end surface of the filter medium 7, and the cylindrical protruding portions 8b and 9b are applied to the filter medium 7 so as to enter the central hole 13 of the filter medium 7 and bonded with an adhesive.

The filter medium fixtures 8 and 9 are smaller than the outer diameter of the end face of the filter medium 7, so that the fluid also contacts the end face of the filter medium 7 as shown in FIG. 2 and the dead zone b is reduced. .

The seal members 10 and 11 are annular members made of, for example, rubber, which have elasticity and sealing properties, and are adhered to the surfaces of the filter medium fixing tools 8 and 9. As shown in FIG. 3, the filter element 6 is housed in a filter case 14 and is used for filtering a fluid.

In FIG. 3, reference numeral 15 indicates a mounting portion of the filter, and the filter case 14 is screwed into the mounting portion 15. In this case 14, one filter medium fixing tool 9 of the filter element 6 is
Connected to the fluid outlet 16 of the both seal members 10, 11
Are in close contact with the inner surface of the case 14 and the surface of the mounting portion 15, respectively. In addition, the fluid guide hole 17 of the attachment portion 15 is blocked from the central hole 13 of the filter element 6 by the lower sealing member 11, so that the filter medium 7 is divided into a clean side and a dust side.

When filtering a fluid such as oil,
As shown in FIG. 3, when the engine or the like is started, the fluid flows into the case 14 through the fluid guide hole 17 of the attachment portion 15 and passes through the filter medium 7 of the filter element 6 from its dust side to its clean side. And filtered. Then, from the central hole 13 of the filter element 6 to the case 14
Go outside and return to the engine.

The filter medium fixing tools 8 and 9 may be of a size so as to cover the entire end faces of the filter medium 7. Since the pleats of the filter material 7 have a uniform pitch, the resistance is small. The filter material fixing tools 8 and 9 are integrally formed of an elastic material such as rubber and
You may make it adhere | attach on both end surfaces of. In that case, the seal members 10 and 11 may be omitted.

The filter medium fixing tools 8 and 9 are omitted, and the sealing member 1 is used.
Only 0 and 11 may be provided and this may be directly bonded to the end surface of the filter medium 7. The seal members 10 and 11 are omitted, and the filter medium fixture 1
It is also possible to form an annular protrusion on the surface of the case 0, 11 and directly contact the inner surface of the case 14.

Example 2 As shown in FIG. 5, this filter element 18
Includes a filter medium 19 having the same structure as in Example 1,
A filter medium fixture 20 made of an elastic sealant is provided at one end, and a filter medium fixture 21 made of a rigid plate is provided at the other end.
have.

One of the filter medium fixing tools 20 is made of silicone rubber,
It is made of an elastic material such as fluorine rubber and acrylic rubber, and like the filter material fixing tools 8 and 9, a ring-shaped plate portion 20.
It has a and a tubular portion 20b, and is adhered to the end surface of the filter medium 19 with an adhesive. The filter material fixture 20 is
As in the examples described later, the filter medium 19 may be inserted into a molding die, and liquid silicone rubber or the like may be cast into the molding to form the filter.

The other filter medium fixing tool 21 is a disk formed by press-molding a metal plate, and is applied and bonded to the end surface of the filter medium 19 so as to close the central hole 22 of the filter medium 19. The plate portion of the filter medium fixing device 20 and the other filter medium fixing device 21 are
In order to reduce the dead zone b (see FIG. 2), it is smaller than the outer diameter of the filter medium 19. However, even if the outer diameter of the filter medium 19 is the same, since the folds of the filter medium 19 are uniform,
It is possible to obtain a predetermined filtration performance.

Thus, the filter element 18 is
As shown in FIG. 5, the compression coil spring 25 is housed in the case 23 similar to that of the first embodiment and is attached to the attachment portion 24 side of the filter element 18 from the disc-shaped filter medium fixture 21 side to the case 23. It is pressed toward the ceiling of. The filter medium 19 is divided into a dust side and a clean side because the filter medium fixture 20 on one side contacts the inner wall surface of the case 23 and the filter medium fixture 21 on the other side shields the central hole 22. The fluid such as the above flows into the case 23 through the fluid guide hole 26 of the mounting portion 24, passes through the filter medium 19 from the dust side to the clean side, and is purified and then flows out of the case 23.

The filter element 18 may be housed in the case 27 as shown in FIG. 6 in reverse. In this case, the compression spring 28 is provided on the ceiling side of the case 27, and the fluid outflow hole 29 is provided on the attachment portion 30 side of the filter. Then, the filter medium 19 is pressed downward by the compression coil spring 28 from the disc-shaped filter medium fixing tool 21 side, and the ring-shaped filter medium fixing tool 20 contacts the attachment site 30 side, so that the dust side and the clean side are formed. It is supposed to be divided into.

Embodiment 3 As shown in FIG. 7, this filter element 31
Is a structure in which filter medium fixing tools 33 and 34 made of an elastic sealant are adhered to both ends of a filter medium 32 having the same structure as the filter medium 7 of the first embodiment.

In this case, the abutting surfaces of the bent pieces of the filter medium 32 are joined together by the adhesive property of the elastic sealant constituting the filter medium fixing tools 33, 24. Each filter medium fixing device 33, 34 is
Similar to the filter medium fixing device 20, a ring-shaped plate portion 33
a, 34a and tubular portions 33b, 34b,
It is adhered to the end surface of the filter medium 32. Both filter medium fixing tools 33,
The plate portions 33a and 34a of the reference numeral 34 are in the dead zone b.
(See FIG. 2) to reduce the outer diameter of the filter medium 32. However, even if the outer diameter of the filter medium 32 is the same, since the folds of the filter medium 32 are uniform, a predetermined filtering performance can be obtained.

As shown in FIG. 8, the filter medium fixing tools 33 and 34 are prepared by inserting the filter medium 32 into a molding die 35, and using a solvent type sealing agent such as liquid silicone rubber, fluorine rubber, acrylic rubber or the like, and a heat sensitive type. It is molded by casting a sealant, a reactive sealant, etc. therein. These materials to be cast have releasability from the mold.

The molding die 35 has a first hollow portion 35a for receiving the bent piece 36 of the filter medium 32, and a second hollow portion 35b for molding the filter medium fixing tool 34. At the time of molding, as shown in FIG. 8, a filter paper folded in a zigzag shape and wound in a tubular shape is used as a first cavity portion 35 a of the molding die 35.
Then, for example, a liquid silicone sealant is poured into the second cavity 35b by using a pipe 38 or the like. The sealant is solidified in the second cavity 35b, and the filter medium fixture 34
To form. Further, the liquid sealing agent simultaneously enters between the contact surfaces 36a of the bent piece 36 of the filter paper in the first cavity 35a and joins the contact surfaces 36a to each other.

The filter medium fixing tool 33 is attached to the other end face of the filter medium 32 in the same manner as described above. The filter medium fixing tools 33, 34 molded in this way have elasticity, and when housed in the case 37 as shown in FIG. 7, it is not necessary to separately prepare a seal member.

Thus, the filter element 31 is
As shown in FIG. 7, it is housed in a case 37 similar to that in the first embodiment, and is provided for fluid filtration. Embodiment 4 As shown in FIGS. 9 and 10, this filter element 39 is molded in the same manner as in Embodiment 3, but in this case one filter medium fixing device 40 has an annular thin piece 41.
Are integrally molded.

The thin piece 41 is projected in the radial direction from the plate portion 40a of the filter medium fixing device 40, and covers the fluid guide hole 43 of the mounting portion 42 of the filter. Therefore, the thin piece 41 functions as a check valve and can prevent the reverse flow of the fluid as shown in FIG.

The filter medium fixing tool 42 having the thin pieces 41 may be formed by preliminarily molding and adhering it to the filter medium 44, not only by the above-mentioned molding method. The filter medium 44 has the same structure as in the above embodiment.

[0038]

EFFECTS OF THE INVENTION According to the present invention, the spacing between the folds of the filter medium can be made constant, and the filter papers of the folds can be prevented from adhering to each other, so that the filter area of the filter medium can be effectively used.
And the resistance can be reduced. Therefore, the filtration performance can be improved.

According to the second aspect of the present invention, since the filter medium fixing device is smaller than the end face of the filter medium, the end face of the filter medium can also be used as the filtering portion. Therefore, the filtration efficiency can be further improved. Moreover, since the filter medium fixing device becomes smaller, the filter can be made smaller and lighter accordingly.

According to the third aspect of the present invention, the bending piece of the filter medium can be adhered and the filter medium fixing tool can be formed at the same time, and the number of assembly steps can be reduced and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing one half of a filter element according to the present invention.

FIG. 2 is a full sectional view of the filter element.

FIG. 3 is a half sectional view of a filter in which the filter element is housed.

FIG. 4 is a diagram showing a manufacturing process of a filter medium of the filter element, FIG. 4 (A) is a perspective view of a filter paper in which a bent piece is being formed, and FIG. 4 (B) is a perspective view of a zigzag-folded filter paper; FIG. 3C is a partially cutaway perspective view of the filter paper wound in a tubular shape.

FIG. 5 is a half sectional view of a filter accommodating a filter element of another embodiment.

FIG. 6 is a half sectional view of a filter in which the filter element of the other embodiment is housed in another case.

FIG. 7 is a half sectional view of a filter accommodating a filter element according to another embodiment.

FIG. 8 is an overall cross-sectional view showing a manufacturing process of the filter element.

FIG. 9 is a half sectional view of a filter accommodating a filter element according to another embodiment.

FIG. 10 shows a local portion of the filter, FIG. 10 (A) is a cross-sectional view in which the thin piece blocks the fluid guide hole, and FIG. 10 (B) is a cross-sectional view in which the thin piece opens the fluid guide hole. ..

FIG. 11 is a full sectional view of a conventional filter element.

FIG. 12 shows a manufacturing process of the conventional filter element, and FIG. 12 (A) is a perspective view of a zigzag-folded filter paper;
FIG. 3B is a plan view of the filter paper wound in a tubular shape.

[Explanation of symbols]

 7a ... Filter paper 7 ... Filter material 6 ... Filter element 12 ... Bent piece 12a ... Abutting surface of the bent piece 8, 9, 20, 21, 33, 34 ... Filter material fixing tool

Claims (3)

[Claims] 1. A filter element having a filter medium obtained by zigzag-folding a filter paper and winding it in a tubular shape, wherein both edges of the filter paper are bent along the zigzag-folding direction, and the both folded parts are folded. A filter element, characterized in that it is wound with the bending piece inside and the contact surfaces of the bending pieces are adhered to each other. 2. The filter element according to claim 1, wherein a filter medium fixing tool having a diameter smaller than an outer diameter of the end face is adhered to both end faces of the filter medium. 3. The filter element according to claim 2, wherein the filter medium fixing member is formed of an elastic sealant, and the abutting surfaces of the bent pieces of the filter medium are bonded to each other by the same elastic sealant. ..