JP2000042308A - Liquid treating filter element and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal the both ends of a filter medium with end plates by integrally forming a resin end plate in which a resin layer of specified thickness is present on the end face of the chrysanthemum-shaped filter medium on the both ends of the filter medium as a filter element for treating a fluid capable of making it incinerated. SOLUTION: Plural projecting pieces 11c thinner than a tube body and having a window hole 11d inside are extended to the outside at the both upper and lower ends of an inner tube 11 forming a frame cylinder with the plural annular parts 11a and vertical columns 11b made of a synthetic resin, a filter medium 12 formed by folding filter paper or nonwoven fabric is wound around the inner tube 11 in a chrysanthemum-shaped cylinder and the both ends are held between the upper and lower projecting pieces 11c. A resin layer formed in a chrysanthemum shape and having a thickness at least corresponding to that of the projecting piece 11c on the end face is made to exist on the both ends of the medium 12 to integrally form an end plate 13 made of the same resin as the inner tube 11 and the both ends of the filter medium 12 are surely sealed by these end plate 13.

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 purifying engine lubricating oil and fuel, and a method for producing the same.

[0002]

2. Description of the Related Art Filters for purifying liquids such as lubricating oils and fuels for vehicle engines are generally disposable types in which a cylindrical filter element is housed in an iron plate case. In recent years, from the viewpoint of preventing environmental pollution and reusing parts, a filter element in which only the filter element is replaceable and which can be incinerated has been adopted.

FIG. 6 shows an example of such a case, and a hat-shaped upper case 1 attached to an engine block.
And a cup-shaped lower case 2 and a filter element 3 housed therein. Both the upper and lower cases are made of casting (aluminum, cast iron, etc. or synthetic resin (nylon, polyethylene, polypropylene, etc.), The upper case 1 has an inflow path 1d and an outflow path 1e for liquid, has a main body 1a fixed to the engine block, and a central path 1f communicating with the outflow path 1e, and supports the upper end of the filter element 3 via a packing 5. A downward facing boss 1c,
It consists of a cylindrical wall portion 1b provided with a female screw 1g inside.

The cup-shaped lower case 2 has an external thread 2g on the outer periphery of the open upper end, and is screwed to the upper case 1, and has a double cylinder upward boss 2a formed in the center of the bottom. And the filter element 3
The peripheral edge of the base plate of the tenon-shaped holder 4 that supports the lower end of the mortar via a packing 5 is detachably engaged with the mortar and is mounted on the inner cylinder of the boss 2a.

[0005] The filter element 3 has strength and heat resistance as described later, and a filter medium 3b obtained by pleating a filter paper or a nonwoven fabric in a wavy shape around a cylindrical inner tube 3a made of a flammable synthetic resin. End plate 3 made of the same synthetic resin as inner tube 3a
c, a packing 5 made of a flexible rubber material is applied to the upper and lower ends of the inner tube 3a, and then fitted into the boss 1c of the upper case 1 and fitted to the holder 4 in the lower case 2. It is inserted and stored in the case.

In use, lubricating oil or fuel on the engine side is taken into the lower case 2 from the inflow passage 1d, and is purified by crossing the filter element 3 from the surrounding area.
Central road 1 of boss 1c of upper case 1
f and the outflow path 1e, and is sent to the engine side. Then, when the filter medium 3b is clogged with the lapse of a predetermined period, the lower case 2 is unscrewed and removed from the upper case 1 and the filter element 3 is pulled out from the lower case 1 and replaced with a new one. It has been done.

The filter element 3 is formed as follows. That is, the inner tube 3a
Is a synthetic resin having mechanical strength and heat resistance, such as polyamide, polyacetal and polypropylene, which has heat resistance and is flammable, and is formed into a frame having a predetermined diameter and height as shown in FIG. Around it, a series of filter paper or nonwoven fabric having the same width as the height of the inner tube 3a is pleated and wrapped in a wavy shape, and a filter material 3b is wound into a chrysanthemum flower-shaped cylindrical shape, and is surrounded by a rubber string S or the like as indicated by a dotted line. Temporarily.

On the other hand, a protrusion 5 fitted in the inner tube 3a and a depth 5 for receiving the end face of the cylindrical filter medium 3b.
mm and a heat plate P
Pellets (diameter 1 to 1.5 mm, length 2 to 3 mm) or particles (diameter 1 to 1.5) made of the same synthetic resin as the inner tube 3a are placed in the annular groove Db of the aluminum forming jig D arranged above. 2mm) shaped resin material m
And heat it with a heat plate P (about 3
(00 ° C.) and, if necessary, irradiate infrared rays from above to melt.

When the resin material m is sufficiently melted, FIG.
A jig D is attached to one end of the inner tube 3a as shown in FIG.
And one end face of the filter medium 3b is fitted into the annular groove Db, and one end face of the tube and the filter medium is brought into contact with the molten resin material m, while a pressing plate T is brought into contact with the opposite end face. The filter medium 3b is gently pushed into the molten resin by the piston rod Ta to form an end plate 3c made of synthetic resin which waits for solidification of the molten resin and closes one end of the inner tube 3a and the filter medium 3b. Then, the annular groove Db of the jig D is again filled with pellets or particulate resin material m and melted, and the inner tube 3a and the filter medium 3b are turned over.
The other end plate 3c is formed by repeating the operation of inserting into the molten resin in b.

[0010]

When forming end plates made of synthetic resin at both ends of the filter element 3 as described above, the inner tube 3a and the filter medium 3b are formed.
In general, the same resin as that of the inner tube 3a is welded from the viewpoint of the adhesive property with respect to the inner tube 3a. However, the same resin as the inner tube 3a is welded, but the synthetic resin used for the inner tube 3a is melted. In the state, the viscosity is high and a film is formed on the surface that comes into contact with the air. Therefore, if the filter medium 3b attached to the inner tube 3a is simply placed on the molten resin, the filter medium 3b does not enter the resin well, so the holding plate However, since the inner tube 3a does not have a means for supporting the filter medium 3b at a fixed position, when the assembled body of both is pressed and inserted into the molten resin, As shown in Fig. 8, the end of the folded fold of the chrysanthemum-shaped filter medium penetrates through the resin layer or solidifies in a rolled-up state, resulting in insufficient sealing. Tend to cause fluid leakage when the internal pressure is applied, there are problems such as requiring a separate packing.

Therefore, the present invention is intended to prevent the filter material from penetrating or curving through the resin layer even when the assembled body of the inner tube and the pleating filter material is inserted under pressure into the same synthetic resin molten resin as the inner tube. Instead, form an end plate with a resin layer of a predetermined thickness on the end surface of the filter material forming a chrysanthemum flower, integrally with both ends of the filter material, measure the connection with the inner tube, and seal both ends of the filter material with the end plate. As an issue.

[0012]

The first object of the present invention is to provide a filter element for fluid treatment, in which a window frame or a rod is provided at both ends of a frame cylindrical or porous cylindrical inner tube made of synthetic resin. A plurality of protruding pieces or an annular protruding piece having many through holes are provided so as to protrude outward, and the width around the inner tube is smaller than the height of the inner tube by almost twice the thickness of the protruding piece. A filter material obtained by pleating a filter paper or a nonwoven fabric is wound in a chrysanthemum flower shape, and at both ends of the filter material, a resin layer corresponding to at least the thickness of the protruding piece is present on each end face to form an end plate made of a synthetic resin. The second feature is that, at one end of a frame cylindrical or porous cylindrical inner tube made of synthetic resin, a plurality of window frame-shaped or rod-shaped projections or an annular projection having many through holes is provided. Each outside A filter medium made by pleating a filter paper or nonwoven fabric with a width smaller than the height of the inner tube by almost twice the wall thickness of the protruding piece from the inner tube is wound around the inner tube in a chrysanthemum flower shape, and the inner periphery of the inner tube is wound around the inner tube. At both ends, at least a resin layer corresponding to the thickness of the protruding piece is present on each end surface to form an end plate made of a synthetic resin. Around the inner tube provided with a plurality of projecting pieces having a window frame shape or a rod shape or an annular projecting piece having many through holes at at least one end, the thickness of the projecting piece is approximately 2 mm thicker than the height of the inner tube. A filter medium with a width twice as small as the filter paper or a non-woven fabric pleated is wrapped in a chrysanthemum-shaped cylindrical shape, and a pellet, particle or powder synthetic resin is formed in the annular groove of a forming jig having a central projection and an annular groove. A predetermined amount of material is filled, the resin material is heated and melted, and one end face of the filter medium supported by the protruding pieces of the inner tube is pushed into the molten resin material, and at least the thickness of the protruding pieces is provided on the end face of the filter medium. The resin material layer to be cooled and solidified is extracted from the molding jig, the inner tube and the filter medium are inverted, and the end face on the inverted side is pushed into the molten resin material in the annular groove of the molding jig, and then inverted. A resin material layer corresponding to at least the thickness of the protruding piece is also present on the end surface of the filter medium on the side of the let-off side, and cooled and solidified, and end plates made of synthetic resin are integrally molded at both ends of the filter medium. is there.

[0013]

FIG. 1 is a cross-sectional view of one example of a filter element 10 according to the present invention, and FIG. 2 is a perspective view of an inner tube 11 used for the filter element 10. A plurality of annular portions 11a and vertical column portions 1 made of synthetic resin having mechanical strength, heat resistance, and flammability, such as polyamide, polyacetal, and polypropylene, as shown in FIG.
1b, a frame having a predetermined diameter and height is formed in a frame cylindrical shape, and around the upper and lower annular portions 11a, a thickness smaller than the thickness in the height direction (for example, about half of the annular portion 11a). so,
Trapezoidal, square, elliptical, semicircular or other window frame-shaped or rod-shaped projecting pieces 11c having window holes 11d provided on the inner side are provided with a plurality of projecting pieces 11c whose outer surfaces coincide with the end faces of the annular portion 11a. They are provided at intervals in the circumferential direction.

Around the inner tube 11, a filter material 12 formed by corrugating a series of filter papers or non-woven cloths having a width corresponding to the height between the inner surfaces of the upper and lower protruding pieces 11c is formed in a chrysanthemum shape. It is wound in a tubular shape, and at its upper and lower ends,
End plates 13 made of the same synthetic resin as the inner tube 11 so that at least a resin layer corresponding to the thickness of the protruding piece 11c is present on each end surface of the filter medium 12, are integrally formed. The upper and lower ends are securely sealed by the resin end plate 13.

FIGS. 3 (a) and 3 (b) show a process of integrally forming the end plate 13 at the end of the filter medium 12, and the filter medium 12 is formed around the inner tube 11 as a chrysanthemum flower. When the filter medium 12 is wound around, both ends of the filter medium 12 are sandwiched by upper and lower protruding pieces 11c, and the middle of the filter medium 12 is temporarily fixed with a rubber string S or the like as shown by a dotted line, while being placed on the heat plate P. A pellet (1 to 1.5 m in diameter) made of the same synthetic resin as the inner tube 11 is placed in the annular groove Db of the forming jig D made of luminium as described above.
m, length 2-3 mm) or particles (diameter 1-2 m)
A predetermined amount of the m) -shaped resin material m is filled, heated with a heat plate P (about 300 ° C.) and, if necessary, irradiated with infrared light from above using a lamp or the like to be melted.

When the resin material m is completely melted, FIG.
A jig D is attached to one end of the inner tube 11 as shown in FIG.
And one end face of the filter medium 12 with the protruding piece 11c is fitted into the annular groove Db so that one end face of the inner tube and the filter medium is brought into contact with the molten resin material m, while a presser is placed on the opposite end face. The plate T is brought into contact with the piston rod T
The inner tube 11 and the filter medium 12 are lightly pushed into the molten resin material m by a.

At this time, the end of the chrysanthemum flower-shaped filter material 12 enters the molten resin material m while being supported by the plurality of projections 11c, and penetrates and curls the molten resin material as before. Is prevented and the inner tube 11
And the outer surface of each projecting piece 11c abuts against the bottom surface of the annular groove Db of the jig, and between the chrysanthemum-shaped end face of the filter medium 12 and the window hole 11d of each projecting piece 11c or between the projecting pieces 11c. A resin layer corresponding to the thickness of the projecting piece 11c including the gap is formed.

Thus, the molten resin is awaited to be solidified, extracted from the molding jig D, and then the annular groove Db of the molding jig D is again filled with pellets or particulate synthetic resin material m and melted. By repeating the operation of inverting the inner tube 11 and the filter medium 12 and pressing the other end face into the molten resin material m in the annular groove Db of the molding jig D, both ends of the filter medium 12 are shown in FIGS. As shown in FIG. 4, an end plate 13 for integrally sealing the end surfaces of the filter medium 12 together with the inner tube 11 is integrally formed.

The filter element 10 thus produced is connected to the upper and lower annular portions 11a of the inner tube 11.
When the filter medium 12 is clogged, a packing made of a flexible rubber material is applied, and the filter medium 12 is used by being fitted to the downward boss portion of the filter upper case and fitted to the holding tool in the lower case as described above. Then, the upper and lower cases are separated and replaced with a new filter element.

In the above example, the inner tube 11
As shown in FIG. 5, the main body is formed in a frame cylindrical shape with a plurality of annular portions 11a and vertical column portions 11b, and a plurality of projecting pieces 11c are provided on the upper and lower annular portions 11a. The main body is made of a porous cylindrical inner tube 11 ', and its upper and lower ends are thinner than the main body and have many through holes 11d'.
May be provided so as to protrude outward. In the above example, the inner tube 11 (11 ') is provided with the protruding pieces 11c (11c' at the upper and lower ends. However, the filter medium 12 and the inner tube 1
3 (b), the position of the filter medium 12 with respect to the inner tube 11 (11 ') is determined if both are coupled at one end as shown in FIG.
1c (11c ') may be provided only on the side on which the integral molding operation is performed first (in this case, the width of the filter medium is equal to the height of the inner tube 11 (11') as in the above-described example, and the protruding pieces 11c (11c ') are used). )), Which is smaller by almost twice as large as the thickness of))). However, as in the above example, the projection 11c
If (11c ') is provided at both ends, the positioning of the filter medium 12 in the width direction is easy and reliable, so that the quality is stabilized. On the other hand, when the protruding piece 11c (11c ') is provided only at one end, the filter medium can be disposed on the inner tube from the axial direction, which is advantageous in that the production can be automated.

If the resin material m for forming the end plate 13 is a powdery material of 50 μm to 300 μm,
The porosity is smaller than that of pellets or particles.
In the molding of No. 3, an end plate 13 with less air inclusion and higher airtightness can be obtained.

[0022]

According to the present invention, since the filter element for fluid treatment is constructed as in claims 1 and 2, there is a synthetic resin layer having a predetermined thickness on the end face of the chrysanthemum-shaped filter medium. In addition, both ends of the filter medium can be reliably sealed, and even if internal pressure is applied during use, the reliability of the filter element can be enhanced without causing fluid leakage. In the case where the projections are provided at both ends of the inner tube as in claim 1, since the positioning in the width direction of the filter medium is easy and reliable, the quality can be stabilized, and as in claim 2, When the protrusion is provided only at one end of the inner tube, the filter medium can be disposed on the inner tube from the axial direction, which is advantageous in automating the production. Further, since the manufacturing method is configured as in claim 3, even if the assembled body of the inner tube and the filter medium is inserted under pressure into the molten resin material, the filter medium is supported at a fixed position by the upper and lower projecting pieces. The end plate having the resin layer of a predetermined thickness on the end face is easily formed integrally at both ends of the filter material without causing the filter material to penetrate the resin material or cause the curl as before. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of a filter element according to the present invention.

FIG. 2 is a perspective view of an example of an inner tube.

FIG. 3 (a) is an explanatory view showing a state where an assembled body of an inner tube and a filter medium according to the present invention is inserted into a molding jig. (B) Explanatory drawing of the state where the said assembled body was pressure-inserted in the shaping | molding jig.

FIG. 4 is an explanatory view showing a state in which an end plate is formed on the filter medium of the present invention.

FIG. 5 is a perspective view of a modified example of the inner tube.

FIG. 6 is a sectional view of a filter using a conventional filter element.

FIG. 7A is an explanatory view before a conventional assembly of an inner tube and a filter medium is inserted into a molding jig. (B) Explanatory drawing of the state where the conventional assembled body was inserted into a molding jig.

FIG. 8 is an explanatory view showing a state in which an end plate is formed on a conventional filter medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Filter element 11, 11 'Inner tube 11a Annular part 11b Vertical column part 11c, 11c' Protrusion piece 11d, 11d 'Window hole 12 Filter material 13 End plate

Claims (3)

[Claims] 1. A plurality of window frame-shaped or rod-shaped projections or annular projections having a large number of through-holes projecting outward from both ends of a cylindrical or porous cylindrical inner tube made of synthetic resin. Provided around the inner tube is a filter material obtained by pleating a filter paper or non-woven fabric with a width smaller than the height of the inner tube by almost twice the thickness of the protruding piece in a chrysanthemum flower shape, and wrapping around the both ends of the filter material A filter element for liquid treatment, characterized in that an end plate made of a synthetic resin is formed by providing a resin layer corresponding to at least the thickness of the projecting piece on each end face. 2. A plurality of window frame-shaped or rod-shaped projections or an annular projection having a large number of through-holes is provided at one end of a frame cylindrical or porous cylindrical inner tube made of synthetic resin so as to project outward. Around the inner tube, a filter medium obtained by pleating a filter paper or a nonwoven fabric with a width smaller than the height of the inner tube by almost twice the wall thickness of the protruding piece is wound in a chrysanthemum-shaped cylindrical shape. A filter element for liquid treatment, wherein an end plate made of a synthetic resin is formed by providing at least a resin layer corresponding to the thickness of a protruding piece on each end face. 3. An inner tube, which is made of a synthetic resin and has at least one end provided with a plurality of window frame-shaped or rod-shaped protrusions or an annular protrusion having a large number of through-holes. Approximately 2 thicker protruding pieces than height
A filter medium with a width twice as small as the filter paper or a non-woven fabric pleated is wrapped in a chrysanthemum-shaped cylindrical shape, and a pellet, particle or powdery synthetic resin material is formed in an annular groove of a forming jig having a central projection and an annular groove. Is filled in a predetermined amount, the resin material is heated and melted, and one end face of the filter medium supported by the protruding pieces of the inner tube is pushed into the molten resin material, and at least the thickness of the protruding pieces on the end face of the filter medium is equivalent to the thickness. Cooling and solidifying the resin material layer,
This is removed from the molding jig, the inner tube and the filter medium are inverted, the end face of the inverted side is pushed into the molten resin material in the annular groove of the molding jig, and the end face of the filter medium is inverted. A method for manufacturing a filter element for liquid treatment, comprising cooling and solidifying a resin material layer at least corresponding to the thickness of the protruding piece, and integrally forming end plates made of synthetic resin at both ends of the filter material.