JP2002079024A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter suitable an air filter of an automobile engine wherein the merit of an elastic material of a seal part is maintained, and wherein the efficiency of air inflow are not deteriorated by improving the durability of a parts of filter elements contacted with a case. SOLUTION: An end part sealing member 7 made of an elastomer material is arranged at one end 18 of filter elements 11, a projecting part 7a is formed by projecting the end part sealing member 7 to the inside of the filter elements 11, a seal ring 8 made of urethane foam is installed at the top of the seal ring 8, and the close ring 8 is sealed to the outer surface of a protruding part 5a of an air outlet 5 protruded into the housing 2. Therefore, the durability of contact parts is improved and an air filtering function due to the seal ring 8 is added by bringing the seal ring 8 into contact with the inner surface of the housing 2 without being the end part sealing member 7 into contact directly with the housing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a filter device (for example, an air filter device for an engine of an automobile or the like).

[0002]

2. Description of the Related Art An air filter element of an engine of an automobile or the like is constructed by arranging a foldable filter paper or the like outside an annular support having a large number of air holes. An annular support of the structure is also provided on the inside and outside of the filter paper, some of which are configured to increase the mechanical strength against compression.

[0003] Both are disposed in the housing of the air filter, and both ends of the annular support are sealed and sealed to the inner wall surface of the housing. The annular support inside one end serves as an outlet for the air taken in. The filtered air is connected to the intake system of the engine.

The sealing of the filter element in the housing is performed by pressing the end of the filter element axially against the inner wall surface of the end of the housing, and between the end of the filter element and the inner wall surface of the end of the housing. A gasket is provided to prevent air from leaking from the end of the filter element.

As the pressure contact mechanism, a bolting method or a latch type is used, but it is required that the filter element be strong enough not to break under the action of the pressure contact force. Therefore, both the filter element and the housing are reinforced to obtain the required strength, which hinders weight reduction and cost reduction.

Therefore, as a sealing structure of a filter element in which an annular support is provided inside and outside the filter paper as described above, a flexible elastomeric material is provided between both ends of the filter element and the inner wall surface of the housing end. Some are configured to be sealed.

However, the elastomer material is made of a urethane foam material having a relatively soft and rubber-like consistency. At the end of the filter element on the air outlet side, the elastomer material is also annularly inwardly into the inner annular support. Protruded,
The structure is also in close contact with the outer surface of the air outlet member.

[0008]

However, in the filter element sealing structure using the elastomer material, since the elastomer material is a flexible material, the housing for pressing the filter element can be fastened by a simple method. The annular support member and the housing of the filter element can also be made of a lightweight and inexpensive material and have the required strength, so that the cost can be reduced, but there are the following problems.

That is, on the air outlet side of the housing,
Since the end side of the annular support for supporting the filter element is applied to the sealed area, the area for forming the filter element is narrowed by that much, and the air introduction efficiency is reduced. Therefore, in order to make up for this loss, it is necessary to increase the size of the entire filter device, which is a factor that hinders weight reduction.

In addition, since the elastomer material is soft, an excessive force is easily applied between the annularly projecting elastomer portion and the air outlet member particularly in the above-mentioned sealing region due to vibration generated when the air filter is used, thereby increasing strength. In some cases, the elastomer portion that is weak to the surface may be easily damaged, and in some cases, the sealing function may be deteriorated, or the deterioration may occur over time (deterioration of elastic force or deterioration due to temperature overheating).

It is an object of the present invention to provide a filter device in which the durability of a portion where a support member of a filter element is in close contact with a case is improved while retaining the advantages of a filter device using a material such as an elastomer. It is in.

[0012]

That is, the present invention relates to a filter device in which a cylindrical filtering member is disposed in a case,
An elastic portion is attached to at least one of the one end portion and the other end portion of the filter member, and the elastic portion extends on the inner peripheral surface of the filter member.On the inner side of the extension portion, An additional member made of a filtering material is provided in close contact with the inner surface of the case, and at the same time as the filtration by the filtering member, a substance flowing between the elastic portion of the filtering member and the case is also filtered through the additional member. (Hereinafter, referred to as a first filter device of the present invention)
It is related to.

According to the first filter device of the present invention, the elastic portion extends on the inner peripheral surface of the filter member, and the additional member provided on the inner side of the elastic portion comes into close contact with the inner surface of the case. The elastic member is protected by the additional member, and at the same time as the original filtration by the filtering member, the additional member also filters a substance flowing between the elastic portion and the case, and the additional member also functions as a filtering material. Therefore, the filtration efficiency of the device can be increased. Therefore, by forming the elastic portion from a flexible material, the filter member can be easily fixed, and the area occupied by the elastic portion on the cylindrical inner peripheral surface of the filter member can be effectively used for filtration. .

The present invention is also a filter device in which a cylindrical filtering member is disposed in a case, wherein an elastic portion is attached to at least one of one end and the other end of the filtering member.
The elastic portion extends on the inner peripheral surface of the filter member, and a low elastic portion or an inelastic portion having lower elasticity than the elastic portion is disposed on the inner side of the extending portion. The present invention relates to a filter device (hereinafter, referred to as a second filter device of the present invention) in which an elastic portion or an inelastic portion is in close contact with the inner surface of the case.

According to the second filter device of the present invention, a low elastic portion or a non-elastic portion having lower elasticity than the elastic portion is provided on the inner side of the extended elastic portion, and this is provided on the inner surface of the case. , So that the elastic part is protected,
By forming the low elasticity portion or the non-elasticity portion with a material having higher durability, the force applied to the elastic portion can be reduced, and the deterioration with time can be prevented. If the low elasticity portion or the non-elasticity portion has a filtering function, the filtering efficiency can be increased as in the case of the first filter device described above, and the elastic portion occupies the cylindrical inner peripheral surface of the filtering member. The area can be used effectively.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first filter device described above comprises:
The additional member is in close contact with the surface of the air discharge portion of the case,
It is desirable to be configured as an air filter device.

In the above-mentioned second filter device, the low-elasticity portion or the non-elasticity portion is made of a filtering material, and has a function of filtering a substance flowing between the end of the filtering member and the case. It is desirable to have.

Thus, the low-elasticity portion or the non-elasticity portion is in close contact with the surface of the air discharge portion of the case, and can be configured as an air filter device.

Here, the "elastic portion" is a concept indicating a portion made of a material having a property of generating a restoring force even when deformed by an external force.

Hereinafter, embodiments of the present invention will be described specifically. In the following description, the first filter device will be described as an example. However, in the following description, the same applies to the first and second filter devices unless otherwise specified.

FIG. 1 shows an air filter device 1 for an automobile engine using a first filter device.
FIG. 4 is a cross-sectional view in which a half (upper part in FIG. 3) of a line cross-section is omitted.

As shown in FIG. 1, this air filter device is provided with an air intake port 4 on a side surface of a housing 2 made of a hard material such as a metal, for example, and is provided in an axial direction orthogonal to the air intake port 4 (upper side in FIG. 1). ), An air outlet 5 is provided at an end thereof, a part of the air outlet 5 is extended in a direction opposite to the outlet to form a projecting portion 5a in the housing 2, and an outer peripheral surface of the projecting portion 5a. The close contact ring of the end sealing member to be described later comes into close contact therewith. On the ceiling 2b of the housing 2, as shown in FIG. 3, for example, linear ribs 21 are formed in four directions so as to hold the filter element in a predetermined place.

A cover 3 is provided at the other end of the housing 2. The housing 2 and the cover 3 are bolted with a gasket 6 interposed between flanges 2a and 3a projecting outward from the respective ends. Be combined.

A filter element 11 is disposed in the housing 2. The filter element 11 is configured by disposing a foldable filter paper 15 between an inner cylinder 13 and an outer cylinder 12 which are annular supports. A gap 17 is formed at a predetermined interval between the outer peripheral surface of the housing 2 and the inner wall of the housing 2, and a flow path of the air flowing from the air intake 4 is formed.

As shown in the figure, one end 18 (upper side in FIG. 1) of the filter element 11
An end sealing member 7 made of an elastomer material (such as urethane foam) having a soft and rubber-like consistency is disposed, and the end sealing member 7 closes one end 18 of the filter element 11, and the outside of the filter element 11 is closed. The flange 7b is engaged with the outer cylinder 12 of the filter element 11, and the inner side thereof is extended on the inner surface 16 of the inner cylinder 13 of the filter element 11, and the projection 7
a, and a close contact ring 8 made of urethane foam is provided at the tip thereof, as shown in FIG. 1 and FIG.

The close-contact ring 8 made of urethane foam has a three-dimensional skeletal structure in which the foam film is completely removed to constitute a three-dimensional skeletal filtration mechanism, and has excellent porosity and excellent air permeability, oil resistance, heat resistance, etc. In the molding step of the end sealing member 7, after setting the close ring 8 in a mold in advance, the molten urethane foam for the end sealing member 7 is injected into the mold. The protrusion 7a of the end sealing member 7 is formed so that a part of the close ring 8 is embedded therein.

As described above, the same material (urethane foam) is used for the end sealing member 7 and the close ring 8.
The sealing ring 8 is different in that the foam film is removed and has air permeability, and the one end sealing member 7 has no air permeability due to the presence of the foam film.

In the case of the second filter device, the close contact ring 8 is formed of urethane foam or the like, and is partially embedded in the projection 7a of the end sealing member 7 as in the first filter device. Molded.

Thus, the close contact ring 8 is firmly and tightly contacting the outer surface of the protruding portion 5a of the air outlet 5 protruding into the housing 2, and the end sealing member 7 is pressed against the ceiling 2b of the housing 2. However, as described above, the ribs 21 provided on the ceiling 2b of the housing 2 form gaps 17a on both sides of the ribs 21 as shown in FIG. An air passage is also formed between the sealing member 7.

The other end 1 of the filter element 11
A gasket 9 made of an elastomer material similar to the above and disposed on the entire bottom surface of the filter element 11 is disposed on a lower portion 9 (the lower side in FIG. 1). Is the filter element 1 on the gasket 9 formed in the thick portion 9a.
The other end 19 of the filter element 11 is hermetically sealed so that the other end 19 of the filter element 11 is embedded.

Therefore, as shown in FIG. 1 and FIG. 2 (enlarged view in the vicinity of the close ring 8 in FIG. 1), the air intake 4
A flows from the filter element 11 into the gap 17 between the filter element 11 and the inner wall of the housing 2, flows mainly through a large number of ventilation holes 14 provided in the outer cylinder 12 of the filter element 11, and is filtered by the filter 15. After that, the housing 2 is passed through a vent hole 14 provided in the inner cylinder 13.
And is introduced from an air outlet 5 into an intake system (not shown).

However, as shown, the air A flowing into the gap 17 between the filter element 11 and the inner wall of the housing 2 is partially
Also flows into the gaps 17a formed on both sides of the rib 21 of
This air A is filtered by the close ring 8 and flows into the air outlet 5 side. Accordingly, it is possible to compensate for a decrease in air inflow (or filtration) efficiency due to the one end side of the inner cylinder 13 being closed by the end sealing member 7, and to reduce the efficiency of the filter element 11, which is the original filtration unit. The burden is reduced, and the size of the entire apparatus can be reduced.

FIG. 5 shows a mechanism in which the close contact ring 8 is firmly and closely contacted with the protruding portion 5a of the air outlet 5. FIG. FIG.
(A) before contact, (b) during contact, and (c) after close contact.

That is, the filter element 11 is mounted in the housing 2 by removing the cover 3 of the housing 2 (see FIG. 1) and inserting the filter element 11 through the opening in the direction of the arrow shown in FIG. It is tightened with the bolt 10. Therefore, when the filter element 11 and the air outlet 5 are
The positional relationship with b is as shown in FIG.

FIG. 5B shows a state where the two have begun to contact each other at the next stage. As shown in FIG. 5A, the inner diameter D ₂ of the annular close-contact ring 8 is different from that of the filter element 1.
1 is reduced in diameter by the elasticity of the protrusion 7a of the end sealing member 7 disposed at one end, and the outer diameter D _{1 of the} protrusion 5a of the air outlet 5 is reduced.
Narrower than.

However, as shown in FIG. 5 (b), when the filter element 11 is further pushed into the housing 2, the tip of the protruding portion 5a of the air outlet 5 is made of a flexible material as shown by a horizontal arrow. The end sealing member 7 of the
It is easily engaged by pushing and spreading. On this occasion,
As shown in FIG. 5A, the engagement can be facilitated by providing an inclined surface 5b as shown by an imaginary line in the protruding portion 5a of the air outlet 5.

Then, as shown in FIG. 5C, after the connection, the close ring 8 is pressed against the outer surface of the protruding portion 5a by the restoring force of the compressed end sealing member 7, and is tightly fixed. As described above, since the filter element 11 can be easily fitted into a predetermined position when the filter element 11 is mounted in the housing 2, for example, the dimensional accuracy of the end sealing member 7 and the engagement with the air outlet 5 are reduced or Design becomes so easy that it can be ignored.

FIG. 6 shows the filter element 11 described above.
FIG. 2 is a perspective view of FIG.

As shown in the figure, the outer cylinder 12 and the inner cylinder 13 are provided with a large number of ventilation holes 14, and a filter 15 made of foldable filter paper is disposed between the outer cylinder 12 and the inner cylinder 13. 18 is sealed by the end sealing member 7, and the end sealing member 7
On the inner side of the projection 7a, a close contact ring 8 is provided with a part thereof embedded therein.
Is entirely sealed by the gasket 9 on the other end 19 side.

According to the present embodiment, the gaps 17a are formed on both sides of the ribs 21 provided on the ceiling 2b of the housing 2, and the air A flowing from the gaps 17a is brought into close contact with the ring 8
Therefore, the filtration efficiency is increased, and the reduction in the air inflow efficiency due to the end sealing member 7 can be compensated. Further, since the end sealing member 7 is protected from contacting the inner surface of the case by the close contact ring 8 without directly contacting the inner surface of the case, the end sealing member 7 made of the elastomer material is made of a flexible material of the elastomer material. , While preventing the end sealing member 7 from being damaged or deteriorated. as a result,
It is possible to solve the problem that the elastomer material having a low strength is easily damaged and the sealing function is deteriorated due to the deterioration.

The above embodiment can be modified based on the technical idea of the present invention.

For example, in the above-described embodiment, the end sealing member 7 made of an elastomer material is provided at one end of the filter element 11 which is a filtering member.
May be provided at both ends of the housing 2, and the air outlet may be provided with a similar end sealing member.

Further, the embodiment is applied to the filter device in which the air flows in from the air inlet 4 and flows to the air outlet 5 through the filter element 11, but is configured to flow in the opposite direction. The present invention can also be applied to other filter devices.

The material of the close ring 8 may be other than urethane foam, or may be a non-elastic material or a material having a lower elasticity than the above-mentioned elastomer material. Any of them may be stronger and more durable than the above-mentioned elastomer material.

Although the embodiment uses a material having an air filtering function for the close ring 8, a material having no filtering function may be used. Also in this case, the durability of the close contact portion can be increased by using a material having a lower elasticity or an inelasticity than the elastomer material.

Further, the above-mentioned end sealing member 7 is made of the same material (for example, a photo-curing elastomer), and is locally irradiated with light by a laser or the like to change the physical properties of the close contact portion to be cured. A low elasticity or inelastic close contact portion may be formed.

Although the air filter device of the embodiment is configured for an automobile engine, the air filter device can be applied to all engines other than an automobile, and can also be applied to purify other fluids such as gas and liquid. be able to.

The shape, structure, material and the like of the air filter device according to the embodiment may be any suitable one other than the embodiment.

[0049]

As described above, in the filter device of the present invention, the elastic portion is extended on the inner peripheral surface of the filter member, and the first filter device is formed of the filter material on the inner side of the elastic portion. Since the additional member and the second filter device are provided with a low elasticity portion or an inelasticity portion and these are in close contact with the inner surface of the case,
The elastic part is protected by an additional member or the like, and the substance flowing between the elastic part and the case can be filtered by the additional member, so that the filtration efficiency of the device can be increased and the elastic part can be made flexible. By forming the filter member from the material, the filter member can be easily fixed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along line II of FIG. 3) of a part of an air filter device according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a plan view of the air filter device.

FIG. 4 is an enlarged cross-sectional view of a part of a cross section taken along line II in FIG. 3;

5A and 5B show a mechanism of close contact of a close portion in the air filter device, wherein FIG. 5A shows a state before contact, FIG.
(C) is a state after close contact.

FIG. 6 is a cutaway perspective view of a part of the filter element of the air filter device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air filter device 2 ... Housing 2a, 3a ... Flange 2b ... Ceiling 3 ... Lid 4 ... Air intake 5 ... Air outlet 5a ... Projection part 5b ... Slope surface 6, 9 ... Gasket 7 ... End sealing member 7a ... Protrusion 7b, 9b ... Flange 8 ... Close contact ring 9a ... Thick portion 10 ... Bolt 11 ... Filter element 12 ... Outer cylinder 13 ... Inner cylinder 14 ... Vent hole 15 ... Filter (filter paper) 16 ... Inner surface 17, 17a ... Gap 18 ... One end part 19 ... other end section 21 ... rib D ₁ ... projecting outside diameter D _2, ... closely ring inner diameter A ... air

Claims (5)

[Claims] 1. A filter device in which a cylindrical filtering member is disposed in a case, wherein an elastic portion is attached to at least one of one end and the other end of the filtering member, and the elastic portion is attached to the filtering portion. An additional member made of a filtering material is provided in close contact with the inner surface of the case, and is provided on the inner side of the extended portion on the inner peripheral surface of the member. A filter device configured to filter a substance flowing between the elastic portion of the filtering member and the case through the additional member. 2. The filter device according to claim 1, wherein the additional member is in close contact with a surface of an air discharge portion of the case, and is configured as an air filter device. 3. A filter device in which a cylindrical filtering member is disposed in a case, wherein an elastic portion is attached to at least one of one end and the other end of the filtering member, and the elastic portion is attached to the filtering portion. The low elasticity portion or the inelasticity portion having a lower elasticity than the elasticity portion is disposed on the inner side of the extension portion. Is in close contact with the inner surface of the case. 4. The filter according to claim 3, wherein the low elasticity portion or the inelasticity portion is made of a filtering material, and has a function of filtering a substance flowing between the end portion of the filtering member and the case. Filter device as described. 5. The filter device according to claim 3, wherein the low elasticity portion or the inelasticity portion is in close contact with a surface of the air discharge portion of the case, and is configured as an air filter device.