JPH09323010A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fluff from causing between two filter mediums. SOLUTION: When an upper casing 11 and a lower casing 12 each in the shape of an almost rectangular shallow dish forming an inlet port 11a and an outlet port 12a respectively are made to face each other and between flange parts 11b, 12b thereof, the edge parts of a filter medium part 20 are held and vibration-welded, since the filter medium part 20 is formed with an inserted plate 21 being inserted between two filter mediums 22, 23, the filter medium parts 22, 23 do not directly come into contact with each other, and fluff is not caused even when vibration is applied, and damage is reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a filter,
In particular, the present invention relates to a filter in which the edge of a filter medium is sandwiched between the edges of a casing to be welded and held.

[0002]

2. Description of the Related Art Conventionally, as a filter of this kind, FIG.
The following are known. In the figure, the two filter media 1 and 2 have their edges sandwiched between the upper casing 3 and the lower casing 4, and the filter media 1 are secured between the upper and lower casings 3 and 4 by vibration welding. , 2 are sandwiched and held.

[0003]

In the conventional filter described above, the two filter media 1 and 2 are rubbed together by vibration welding while directly facing each other. Since the filter media 1 and 2 are made of a fibrous material, the fibers are pressed against each other and rub against each other, which causes a problem that fluffing occurs. The present invention has been made in view of the above problems, and an object of the present invention is to provide a filter capable of suppressing fluffing of a filter medium.

[0004]

In order to achieve the above object, the invention according to claim 1 is a housing in which a pair of casings having an inlet and an outlet are vibration welded with their open ends facing each other. And a plurality of filter media whose edges are sandwiched between the open ends of the casing so as to be interposed between the flow paths flowing out from the inlet to the outlet, the plurality of filters being provided. The sandwiching plate is sandwiched between the edges of the filter medium.

The invention according to claim 2 is the same as claim 1.
In the filter described in (3) above, a concavo-convex shape is formed in a portion of the holding plate that faces the filter medium. Further, the invention according to claim 3 is the filter according to claim 1 or claim 2, wherein a meshing member that cooperates with the opposing surfaces of the holding plate and the edge portion of the casing to prevent the edge portion of the filter medium from coming off. It is configured to have a shape.

[0006]

In the invention according to claim 1 configured as described above, a plurality of filter media can be sandwiched between the open ends of the casing at the time of assembling, and a sandwich plate is sandwiched between these filter media. Each of the filter media is sandwiched between the casing and the sandwich plate when the casings are vibrated and welded together. That is, the filter media are not directly rubbed with each other and fluffing does not occur. On the other hand, after welding, when the liquid to be filtered passes from the inlet to the outlet of the housing, the liquid to be filtered passes through the filter medium to remove dust and the like. At this time, no fluff is generated on the filter medium, and the scattered fiber components do not flow out.

Further, in the invention according to claim 2 configured as described above, the concavo-convex shape is formed on the surface of the holding plate which faces the filter medium, and when the filter medium is sandwiched, the filter medium becomes It is pressed and bites, and the relative position of the sandwiching plate and the filter medium does not shift. Further, in the invention according to claim 3 configured as described above, the filter medium is sandwiched so that the sandwiching plate and the edge portion of the casing mesh with each other, and the filter media bite into each other so that the relative positions do not shift.

[0008]

As described above, according to the present invention, since the filter media are prevented from directly rubbing against each other, it is possible to provide a filter capable of suppressing fluff and preventing scattered fibers from flowing out. According to the second aspect of the present invention, the positional deviation between the holding plate and the filter medium is eliminated, and it is not necessary to prevent the edge surface on the casing side from being displaced, so that the shape can be made simple. Further, according to the third aspect of the invention, the displacement is not generated by biting the filter medium, and when the vibration is applied, the displacement amount between the holding plate and the casing is smaller than the displacement amount between the casings. It is possible to avoid overloading the filter medium.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a filter according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a sectional view showing an edge portion. In FIG. 1, a resin housing 10 is formed in a hollow shape by facing a substantially rectangular shallow dish-shaped upper casing 11 and a lower casing 12 to each other, and from an inlet 12 a formed in the lower casing 12 to an upper casing. A series of communication passages leading to the outlet 11a formed in 11 are formed. Here, the lower casing 12 has a flange portion 12b which is formed in a flange shape outwardly along the opening surface, and similarly the upper casing 11
Also has a flange portion 11b and is airtightly fixed by vibration welding as described later.

In the present embodiment, the hollow housing 10 is formed by the two upper and lower casings 11 and 12, which are fixed to each other to form a series of flow passages. It may be a pair of casings, one of which has a cup shape and the other of which has a lid shape, or one in which the cylinders are simply connected with their open ends facing each other. It doesn't matter. Further, although each of the inlet 12a and the outlet 11a is also formed one by one, it may be increased if necessary, and the shape thereof may be appropriately modified by making it flat like a pipe. is there. Further, these attachment positions do not necessarily need to have the inlet port formed in the lower casing 12 and the outlet port formed in the upper casing 11, and can be appropriately changed according to the filtering direction, and each casing 11 , 12 may also be formed at positions as required. It should be noted that if the introduction port is formed at the bottom of the oil tank in which the filter is housed, the amount of oil used can be reduced.

When the upper casing 11 and the lower casing 12 are made to face each other, the filter medium portion 20 is interposed so as to cross the both. As shown in FIG. 4, the filter medium portion 20 includes a resin sandwiching plate 21, and a first filter medium 22 and a second filter medium 23 arranged on both sides of the sandwiching plate 21. The clamping plate 21 is formed with turret parts 21a1, 21a2 projecting to the upper surface side and the lower surface side, and a through hole 21b (21b1) is formed at the center of the top of each of the turret parts 21a (21a1, 21a2) as shown in FIG. , 21b2) are formed, and an annular protruding wall 21c (21c1, 21c2) is formed on the top surface on the inner side of the through hole 21b.
Is formed.

On the other hand, in each of the first filter medium 22 and the second filter medium 23, the communication holes 22a, 2 through which the projecting wall 21c can be inserted at a position corresponding to one of the through holes 21b1, 21b2.
3a is formed, and the first filter medium 22 has a communication hole 2
The protruding wall 21c1 can be inserted into 2a and the second filter material 2
For No. 3, the protruding wall 21c2 can be inserted into the communication hole 23a. When placed on the turret parts 21a1, 21a2, respectively, from the communication holes 22a, 23a, the projecting wall 21c
1, 21c2 are projected, and the ring-shaped welding plates 24, 24 can be welded and fixed from above to fix the first filter medium 22 and the second filter medium 23 in close contact with the holding plate 21.

That is, the welding plate 24 is the same as the protruding wall 21c.
1, 21c2 outer diameter and the through hole 21b1,
21b2 is formed in a ring shape including an inner edge having a diameter smaller than that of 21b2, and a low protruding wall 24a is provided at a position facing the protruding walls 21c1 and 21c2, and the turret portion 21a is provided on the inner edge portion.
It is provided with a high projecting wall 24b projecting to the side. Here, even if the protruding wall 24b is higher, the protruding wall 21c and the protruding wall 2
4a does not reach the surface of the turret portion 21a.

When the welding plates 24, 24 are vibrated while being pressed against the respective turret parts 21a1, 21a2, the projecting walls 21c1, 21c2 are melted by frictional heat, and the welding plates 24, 24 gradually become turret parts 21a1, 21a.
2, the first filter medium 22 and the second filter medium 23 are strongly pressed and fixed. In addition, when the welding is completed, the projecting wall 24b on the high side formed on the welding plate 24 is the turret portion 2
It comes into contact with 1a1, 21a2.

On the other hand, the sandwiching plate 21, the first filter medium 22 and the second filter medium 23 have the same outer shape, and the edges thereof are the flange portions 11 of the upper casing 11 and the lower casing 12.
The size is such that it is sandwiched between b and 12b. Therefore, the upper casing 11 and the lower casing 12 are made to face each other by sandwiching the filter medium portion 20 therebetween,
The edge portions of the sandwiching plate 21, the first filter medium 22, and the second filter medium 23 are flange portions 11b of the upper casing 11 and the lower casing 12,
It is sandwiched between 12b. In this state, the holding plate 21 is sandwiched between the edges of the first filter medium 22 and the second filter medium 23 at the same time, and the first filter medium 22 and the second filter medium 23 are not in direct contact with each other. A large number of small projections 21d are formed on the sandwiching plate 21 so as to protrude downward.

The flange portions 11b, 12b of the upper casing 11 and the lower casing 12 have a diameter slightly larger than the edge portion of the filter medium portion 20, and vibration welding is possible in the same manner as the facing surface between the welding plate 24 and the turret portion 21a. Has become. That is, the flange portion 11b of the upper casing 11 is provided with the projecting wall 11b1 in the middle of the radial direction and the projecting wall 11b2 on the inner side, and the flange portion 12b of the lower casing 12 is projecting at a position facing the projecting wall 11b2. The wall 12b2 is provided and the protruding wall 12b3 is provided at the outermost edge. Flange part 11
When b and 12b are faced to each other, the protruding wall 11b1 of the upper casing 11 abuts on the flange portion 12b of the lower casing 12, a gap is formed between the inner protruding walls 11b2 and 12b2, and the outer protruding wall 12b3 is also formed. It does not hit the flange portion 11b. When vibration is applied to the flange portions 11b and 12b while applying pressure,
The projecting wall 11b1 and the flange portion 12b in the middle rub against each other to generate frictional heat, and are gradually melted and fixed.

When vibration welding is performed in this manner, the protruding wall 11
In the portion inside b2 and 12b2, the first filter medium 22 is pressed against the flange portion 11b on the upper surface side, and the second filter medium 23 is pressed against the flange portion 12b on the lower surface side. Therefore,
Each of them is vibrated while being sandwiched between the sandwiching plate 21, and is gradually and strongly pressed. If it is a conventional one, at this time, the first filter medium 22 and the second filter medium 2
Since they are in direct contact with each other, they act so that they are pressed against each other and rubbed against each other when vibration is applied, and fluffing occurs between them. The fibers are scattered due to the fluffing, and the strength is reduced accordingly, and the strength is reduced at the edge portions sandwiched by the flange portions 11b and 12b. This makes it necessary to set a shorter lifetime than the original lifetime according to the strength of other parts.

However, in this embodiment, the holding plate 21 is sandwiched between the edges of the first filter medium 22 and the second filter medium 23, so that the first filter medium 22 and the second filter medium 23 are directly connected to each other. No contact and no fluffing. In addition, since the sandwiching plate 21 is interposed between the filter plates 2,
Since the amount of movement of the upper and lower surfaces due to vibration is halved for 2 and 23, fluffing is less likely to occur and damage to the fibers is also reduced. In the present embodiment, the sandwiching plate 21
Is formed into a plate shape that traverses the entire surface of the housing 10, but at least the filter medium 22, which is sandwiched,
It suffices if it is interposed between the edges of 23. For example, FIG.
And in what is shown in FIG. 8, the holding plate 25 is formed in a frame shape,
The upper and lower first filter media 26 and the second filter media 27 are sandwiched between the edges. The second filter material 27 has a through hole 27a corresponding to the introduction port 12a of the lower casing 12.
And the welding plate 28 can be welded and fixed by the welding plate 28. Further, through holes 26b and 27b are formed at positions where the first filter medium 26 and the second filter medium 27 face each other, and the edges are bonded and fixed. ing. Even in such a configuration, by sandwiching the filter medium portion 20 between the upper casing 11 and the lower casing 12 so as to face each other, the sandwiching plate 2
5 and the edges of the first filter medium 26 and the second filter medium 27 are sandwiched between the flange portions 11b and 12b of the upper casing 11 and the lower casing 12, and even if vibration welding is performed, the first filter medium 26 and the second filter medium 27 are directly attached to each other. It does not come into contact with and does not fluff.

Further, annular ribs 21e (21e1, 21e2) are provided on the upper and lower edges of the holding plate 21, respectively.
When the edge of the filter medium portion 20 is strongly sandwiched between the flange portions 11b and 12b, the rib 2 is formed.
1e1 and 21e2 bite into the first filter medium 22 and the second filter medium 23 and can be firmly fixed. In the present embodiment, the ribs 21e are formed only on the side of the holding plate 21, but it is sufficient if the ribs 21e are formed so as to cut into the filter medium by forming the uneven shape, and as shown in FIG. 9, the flange portion 11b is formed. , 1
By forming the ribs 11b4 and 12b4 on the side of 2b as well, the ribs 11b4 and 12b4 may be formed so as to bite into the first filter medium 22 and the second filter medium 23 to make it difficult to come out. Further, since it is only necessary to bite into the filter medium, even if a concave portion is formed, its corner portion bites into and becomes difficult to come out. Needless to say, instead of the rib shape, a large number of small protrusions may be formed. Basically, when unevenness is formed on both sides, it becomes a meshing shape, and the retaining effect is great.

It is sufficient that the filter media do not come into direct contact with each other, and it is not always necessary to sandwich one sandwich plate 21 between the two filter media 22 and 23. For example, as shown in FIG.
It is also possible to use three filter media 29 as shown in FIG. 0 and sandwich the sandwiching plate 21 between them. Next, the operation of this embodiment having the above configuration will be described. The housing 10 configured as shown in FIG. 2 is immersed in the oil pan inside the automatic transmission, and the outlet 11a formed in the upper casing 11 is connected to an oil pump (not shown). When the engine is started and the oil pump is driven, the dirty oil in the oil pan is sucked into the housing 10 through the inlet 12a of the lower casing 12. The oil passes through the filter medium portion 20 interposed between the upper casing 11 and the lower casing 12, and there are two routes at this time. One is a path that passes through the second through hole 21b2 of the holding plate 21 from the inlet 12a and then passes through the first filter medium 22 as shown by arrow A in FIG. 2, and the other is the arrow B. As shown in (1), it is a path that first passes through the second filter medium 23 and then passes through the first through hole 21b1 of the holding plate 21. In any case, one of the first filter medium 22 and the second filter medium 23 is passed while passing through the filter medium section 20. The first filter medium 22 and the second filter medium 23 are superposed on both sides of the sandwiching plate 21, and the filter medium portion 2 is substantially integrated.
While configuring 0, the oil will pass through only one of them, and the filtration area will be approximately twice the cross-sectional area. When passing through the route indicated by arrow B, the second filter medium 2
Although 3 is pressed against the sandwiching plate 21, sticking can be prevented by the small protrusion 21d.

Further, in the case of the construction shown in FIG. 7, the oil sucked from the inlet 12a enters between the first filter medium 26 and the second filter medium 27, and the oil passing through the first filter medium 26 on the upper surface is The oil that has been guided to the outlet 11a as it is and passed through the second filter material 27 on the lower surface is the through holes 26a, 27
It is led out to the outlet 11a while passing through b and flowing upward. In this way, the upper casing 11 having a substantially rectangular shallow plate in which the outlet 11a and the inlet 12a are formed, respectively.
And the lower casing 12 face each other, and the flange portion 1 thereof
When sandwiching the edge portion of the filter medium portion 20 between 1b and 12b and performing vibration welding, the filter medium portion 20 includes two filter mediums 22, 2
Since the holding plate 21 is sandwiched between the three,
The filter media 22 and 23 do not come into direct contact with each other, and fluff does not occur even when vibration is applied, and damage can be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view of a filter according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the filter.

FIG. 3 is a cross-sectional view of an edge portion of the filter.

FIG. 4 is an exploded perspective view of a filter medium portion used in the present filter.

FIG. 5 is a cross-sectional view showing a welding process of the turret portion in the filter medium portion.

FIG. 6 is a cross-sectional view showing a welding completed state of the turret portion in the filter medium portion.

FIG. 7 is a cross-sectional view of a filter according to another embodiment.

FIG. 8 is an exploded perspective view of a filter medium portion used in the filter.

FIG. 9 is a cross-sectional view of an edge portion of a filter according to a modification.

FIG. 10 is a cross-sectional view of an edge portion of a filter according to a modification.

FIG. 11 is a sectional view of an edge portion of a conventional filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Upper casing 11a ... Outlet port 11b ... Flange part 12 ... Lower casing 12a ... Inlet port 12b ... Flange part 20 ... Filter material part 21 ... Clamp plate 22 ... First filter medium 23 ... Second filter medium 25 ... Clamp plate 26 ... first filter material 27 ... second filter material 29 ... filter material

Claims (3)

[Claims] 1. A housing in which a pair of casings having an inlet and an outlet are welded by vibration with their open ends facing each other and a flow passage flowing out from the inlet to the outlet. A filter comprising a plurality of filter media whose edges are sandwiched between the opening ends of the casing, wherein a sandwiching plate is sandwiched between the edges of the plurality of filter media. . 2. The filter according to claim 1, wherein a concavo-convex shape is formed in a portion of the holding plate that faces the filter medium. 3. The filter according to claim 1 or 2, wherein a meshing shape is formed on the surfaces of the sandwiching plate and the edge of the casing that face each other so as to prevent the edge of the filter medium from coming off. A filter characterized by that.