JPS597576Y2 - air purifier - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air cleaner that is conveniently applied to internal combustion engines, air pumps, etc., and is intended to stably supply clean air even when used at high temperatures.

In the conventional type, as shown in FIGS. 1 and 2, a gasket 5 is provided between the cap 1 made of synthetic resin and the upper end plate 4 of the annular filtration element 3; A gasket 5' is arranged between the case 2 and the lower end plate 4' of the filter element 3, respectively.

Further, in order to seal between the cap 1 and the case 2 and the filter element 3, a bolt 6 is inserted inside the filter element 3 and passes through the cap 1 and the case 2 in the axial direction.
A nut 7 screwed into the nut 7 tightens the cap 1 and the case 2 to each other at the center thereof, and a plurality of clamps 8 are attached to the outer peripheral wall of the case 2.
This allows the case 2 and the cap 1 to be tightened together also at their outer peripheries.

However, the cap 1 and case 2 made of resin are
When the temperature rises under a load, the cap 1 and the case 2 undergo creep deformation in the height direction of the filtration element 3, and as a result, the tightening pressure acting on the gasket 5.5' decreases, causing the cap 1 and the case 2 to deform in the height direction of the filtration element 3. Case 2 and filtration element 3
The seal between the

In order to prevent this, the upper surface of cap 1 and case 2
A plurality of radial ribs 10 and 11 are provided protruding from the lower surface of the cap 1 and the case 2 to prevent thermal deformation between the cap 1 and the case 2.

As described above, in the conventional air cleaner, the cap 1 and the case 2 of the casing that house the filter element 3 are provided with a plurality of radial ribs 10, 11, so the shape is complicated, and furthermore, these ribs 10, 11 Since extra resin material is required for the provision of , the cost increases accordingly.

In addition, the ribs 10 and 11, which cause high costs,
We cannot expect much effect from providing this.

In other words, most of these types of air purifiers are for vehicles, and the engine room of the vehicle often reaches a high temperature, so the cap 1 and case 2 of the air purifier are heated by the ribs 10 and 1.
Even if it is reinforced with 1, thermal deformation is unavoidable.

Moreover, large vibrations are applied to the air cleaner while the vehicle is running, which induces deformation of the cap 1 and the case 2.

In addition, since the cap 1 and the case 2 are assembled in a bent state in order to press the gaskets 5, 5' and the end plates 4, 4', the outer periphery of the casing is deformed and a gap is generated. It also has the disadvantage that intake noise from the intake system leaks.

The present invention has been developed with the aim of solving the above problems, and its gist is to press the filtration element gasket to the filtration element end plate by tightening the resin cap and the case, and to remove the filtration element from the filtration element. Instead of sealing the clean side and non-clean side of the filter, one end of the filtration element is airtightly joined to the resin cap, eliminating the seal on the cap side and connecting the lower end of the filtration element to the end plate. The end plate is airtightly joined to the end plate, and an annular side seal surface is formed on the inside or outside of the filtration element. The structure is such that sealing is achieved by pressing the material against the surface.

3 and 4 show an air purifier for an internal combustion engine according to an embodiment of the present invention, in which reference numeral 20 denotes a cap 21 made of a synthetic resin such as polypropylene, and a case made of a similar synthetic resin. 22, and a ring-shaped (including circular and polygonal ring-shaped) filtration element 24 is housed inside the casing.

The annular filter element 24 is made of filter paper, nonwoven fabric, etc.
Its upper end is airtightly joined to the flat portion 21 b of the cap 21 by heat welding, and its lower end is hermetically joined to an annular end plate 26 made of synthetic resin such as polypropylene by heat welding.

An annular side seal surface 26 a that is substantially perpendicular to the end plate 26 is integrally installed on the inner peripheral side of the end plate 26 .

An annular step 22 e is integrally formed in the case 22 so as to correspond to the side seal surface 26 a, and the tip of the step 22 e is elastically deformed to the side seal surface 26 a. A pressure-contacting annular rubber side seal gasket 29 is adhered.

An opening 22b is formed in the center of the case 22, and the opening 22b is attached to an outer end 50 of an intake passage of the engine (for example, an air intake port of a carburetor) via a gasket 53.

Further, a plurality of spiders 23 extend obliquely upward from the vicinity of the opening 22b to the inner surface of the central portion 21C of the cap 21, and the upper ends of these spiders 23 are integrally connected in a ring shape.

When installing the casing 20, this ring-shaped connecting portion 22
A stud bolt 51 protruding axially from the inside of the outer end 50 of the engine intake passage is passed through the center hole 22 g of the center hole 22 g of the cap 21 and the center hole 21 C of the center part of the cap 21 . Screw the nut 52 together and tighten.

Outer periphery 21a of cap 21 and outer periphery 22a of case
are loosely fitted together and tightened with a plurality of metal clamps 30.

In addition, an intake passage 22 for air intake is provided on the outer periphery of the case 22.
d is integrally shaped.

In the above structure, the non-clean air is purified by the flow filter element 24 as shown in FIG.
b to the combustion chamber of the internal combustion engine.

In the air cleaner of the present invention, the side seal mechanism 26 is less susceptible to thermal deformation in the vertical direction of the casing.
Since the side seal surface 26a is adopted, even if the case 22 is slightly deformed downward due to thermal deformation, for example, the side seal surface 26a
As long as the side seal gasket 29 is in contact within the height dimension, the seal is secured.

In addition, since the upper end of the element 24 is hermetically joined to the cap 21, leakage from the seal between the clean side 27 and the non-clean side 28 is prevented due to deformation of the cap 21.
4 or the cap 21 is not broken.

5 and 6 show another embodiment of the side seal mechanism, in which a side seal gasket 29 has an annular tongue piece 29 extending from its lower end toward the outer circumference of the case 22.
A is integrally shaped, and a plurality of protrusions 29b for receiving the end plate 26 are integrally formed on this tongue piece 29a.

In this embodiment, the vertical vibration of the end plate 26 due to the vibration of the element 24 can be alleviated by the convex portion 29b.

FIG. 7 shows a further embodiment of the present invention in which a recess 22h is provided to improve assembly and facilitate adhesive application work when adhering the side seal gasket 29 to the step 22e of the case 22. This is an example.

The present invention is not limited to the above-mentioned embodiments, and the filtration element 24 and the cap 21 may be airtightly joined with an adhesive, and the end plate 26 and the filtration element 24 may be hermetically joined with an adhesive. May be joined.

Further, the end plate 26 may be made of iron material, and the gasket 2
9 may be made of elastic resin.

Further, the annular side sealing surface 26a may be provided outside the end plate 26 (outside the element 24).

In summary, according to the present invention, one end of the filtration element is hermetically joined to the cap, and the other end of the filtration element is airtightly joined to the cap and case, which constitute a casing for housing an annular filtration element. An end plate is airtightly joined to the end plate, and an annular side sealing surface is formed on the side surface of this end plate, while an annular side sealing gasket is fixed to the above case, and this gasket is attached to the side sealing surface of the end plate. Because they are in elastic pressure contact, even if the Hewei resin cap and case are thermally deformed in the height direction of the filtration element, the seal between the side seal surface and the side seal gasket is not affected by the thermal deformation. Moreover, since the airtight joint between the cap side and the end of the filter element is not affected by thermal deformation, the airtightness between the filter element, the cap, and the case is maintained.

In addition, since this invention can eliminate airtightness as described above, there is no need to thicken the thickness of the cap and case by forming reinforcing ribs on the cap and case, resulting in weight reduction and cost reduction. can contribute to

Furthermore, unlike conventional structures, the present invention does not have a structure in which a load is applied in the height direction of the filtration element to compress the gasket and maintain airtightness, so there is no bending of the cap and case that occurs when such loads are applied. It is possible to eliminate the problems of poor airtightness and sound leakage caused by a gap that occurs at the mounting portion between the cap and the case due to this bending.

[Brief explanation of drawings]

1 and 2 are an axial sectional view and a top view, respectively, of a conventional air cleaner for an internal combustion engine, and FIGS. 3 and 4 are axial sectional views, respectively, of an air cleaner for an internal combustion engine according to an embodiment of the present invention. The sectional view, partially cutaway top view, and Figures 5 and 7 are shown in Figure 3.
This is a modification of the seal gasket portion of the embodiment shown in FIGS. and 4, and FIG. 6 is a perspective view of the seal gasket shown in FIG. 5. 21... Catfish of casing 20, 22.
...Same case, 24...Filtering element, 26...End plate, 26 a...Annular side seal surface, 29...Annular side seal gasket.

Claims (1)

[Scope of utility model registration request] A resin cap, an annular filtration element hermetically joined to the cap at one end, and an annular side seal surface hermetically joined to the other end of the filtration element on the inside or outside of the filtration element. with an end plate,
comprising a resin case attached to the clean air supply source side, and an annular side seal gasket fixed to a portion of the case corresponding to the side seal surface of the end plate,
The filtration element is housed in the case by attaching the cap to the case, and in the housed state, the side seal gasket comes into pressure contact with the side seal surface of the end plate of the filtration element. An air purifier characterized in that a clean side and a non-clean side of a filtration element are sealed.