JPS61226557A - Air cleaner - Google Patents

Abstract

PURPOSE:To release restriction on the fixing space thus to protect the functional parts by forming the lower space communicatable to the clean side at the bottom of case. CONSTITUTION:Lower space 8 is formed by a partition board 7 and the bottom board 1b of case 1. A lead-out port 20 for feeding secondary air of the exhaust gas purification system, an intake air temperature sensor 18 and a lead-out port 21 for returning the gas leaked through the crank case to a carburetor 10 are provided on the bottom board 1b. The cold or warm air led from a negative pressure intake air temperature regulator 17 will enter into the dusty side or an intermediate section space 9 then pass through a filtering element 4 from the underside and led through the clean side or the upper space 6 a communication port 13, a central tube 4b, the lower space 8 and a lead-out tube 11 to the carburetor 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air cleaner used for air purification of an internal combustion engine installed in a vehicle such as an automobile.

[Conventional technology]

Conventionally, in this type of axial flow air purifier, air introduced from an air introduction pipe enters the upper space of a filtration element, and the filtration element removes dust, as disclosed in Japanese Patent Application Laid-Open No. 57-140617. , removes dust, etc., and guides clean air into the space below the filtration element.
Furthermore, a so-called downflow type (air flows from top to bottom with respect to the filtration element) was used to introduce clean air into the cassobretor that continues into the lower space.

However, with such a downflow type, if muddy water or air with a high moisture content is introduced from the outside air,
There was a problem with water passing through the filter element and entering the carburetor.

On the other hand, as disclosed in Japanese Utility Model Application No. 59-123656, a large air pipe is opened into the lower space of the filtration element, the introduced air is passed through the filtration element from the bottom to the top, and the air is filtered from the upper space. A so-called upflow type air cleaner is known in which air is drawn into a carburetor through a vent pipe provided in the center of the element.

With such a configuration, the water droplets that have entered or the water droplets that have aggregated on the filter element stay on the case bottom plate due to gravity, so it is possible to avoid the problem of the water droplets being sucked into the carburetor.

On the other hand, air purifiers are equipped with an intake air temperature control device to keep the intake air temperature as constant as possible and allow the engine to operate normally. ). In addition, piping that introduces secondary air sent into high-temperature exhaust gas as an exhaust gas purification system, and piping for reducing blow-by gas that leaks from the engine's combustion chamber into the crankcase are also installed on the clean side of the air purifier. It is connected to the.

Therefore, in the above-mentioned upflow type air purifier, since the clean side is located at the top, the functional components need to be attached to the top surface of the air purifier.

[Problem that the invention seeks to solve]

However, in general vehicles, especially passenger cars, the bonnet is close above the air purifier, and considering the need to provide a safe space in consideration of engine vibrations, etc.
It is almost impossible to provide the functional parts above. In addition, if it is exposed upward, it is often damaged during assembly or maintenance (this is not desirable for the protection of functional parts, and furthermore, the routing of piping from functional parts becomes complicated, which is undesirable for the appearance). The problem was that there was no.

[Means for solving problems]

In order to solve the above problems, the present invention provides a space communicating with the clean side at the bottom of the case of an upflow type air purifier.

[For production]

In the present invention, since the lower space communicating with the clean side is formed at the bottom of the case as described above, functional components can be disposed on the lower surface, and a structure provided on the upper surface can be avoided.

〔Effect of the invention〕

Therefore, by adopting the configuration of the present invention, by arranging the functional components on the lower surface, it is possible to alleviate the installation space constraints, and at the same time, it is possible to protect the functional components.
Furthermore, the piping from the functional parts can be easily routed, and it has excellent effects in terms of appearance.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 (al, (bl) is a cross-sectional view explaining the structure of the first embodiment of the present invention and its A-A cross-sectional plan view; 1 is a case made of a resin or steel plate with a circular cross section; 2 is a case made of a resin or steel plate; It is a cap made of the same material that covers the top surface of case I,
The case 1 and the cap 2 are detachably attached to each other by clamps (not shown) provided at several places on the outer edge of the upper end of the case 1 and by fixing the fixing screw 3 in the center to the attaching bolt 3a. There is.

Reference numeral 4 denotes a filter element made of filter paper non-woven fabric, etc., and as disclosed in Japanese Patent Application Laid-open No. 140617/1982, the upper and lower ends are bent so as to form alternating peaks and valleys, and the whole is in a circular shape. The manufactured filtration element has a
An end plate 4a made of resin is provided on the body. Further, a cylindrical resin center tube 4b is provided at the center thereof. End plate 4a of filter element 4 and upper end 1a of case 1
and is sealed and fixed via a gasket 5,
An upper space 6 is formed by the filter element 4 and the cap 2.

Reference numeral 7 denotes a partition plate made of a resin or steel plate that partitions the space below the filter element of the case 1 into upper and lower parts, and has the same circular shape as the case 1. The outer peripheral part 7a of this partition Fi7 is fixed to the side part 1c of the case l by adhesive or welding,
Furthermore, it is sealed with a sealant or the like. A lower space 8 is partitioned between this partition plate 7 and the bottom plate 1 of the case 1.
is formed over the entire circumference of the bottom of the case, and similarly a hollow space 9 partitioned by the filter element 4 and the partition plate 7 is formed. An air outlet pipe 11 is connected to the center of the bottom surface of the case l for guiding clean air to a carburetor 10 provided directly below the air cleaner and supplying air-mixed fuel to the engine 19.

At the center of the partition plate 7 is a central tube 4 of the filter element 4.
A hole 7b corresponding to the diameter of b is provided, and this hole 7
The filtration element 4 is placed on the gasket 12 disposed on the inner periphery of the cap 2 by passing the center hole provided in the center of the upper surface 4c of the center cylinder 4b through the mounting bolt 3a. The cap 2 is mounted by passing a sleeve 3c made of a steel plate provided in the center and whose outer periphery is covered by a cylindrical rubber member 3b through the mounting port 3a, and the entire body is tightened and fixed by a fixing nut 3. . Note that the recess 7C provided on the partition plate 7 is provided to prevent deformation of the partition plate 7 during tightening, as shown in Fig. 1 (b).
), it is provided only on a part of the entire circumference. Of course, a plurality of recesses or ribs may be provided to achieve the purpose of reinforcement.

A plurality of communication ports 13 for communicating the upper space 6 and the lower space 8 are provided in the upper surface portion 4C of the central cylinder 4b of the filtration element 4.

Reference numeral 14 denotes an air introduction pipe connected to the side surface 1c of the body 1 and communicates with the intermediate space 9. Therefore, this intermediate space 9 is a dusty side in which air from which dirt and dust have not been removed is present, and the lower space 8 that communicates with the upper space 6 through the communication port 13 and the central cylinder 4b is the one where the filtration element 4 is Forms a clean side where clean air exists after passing through. Note that the portion of the partition plate 7 facing the air introduction pipe 14 has a downwardly inclined shape as shown in FIG. .

At the tip of the air introduction pipe 14, there is a negative pressure type for selectively introducing cold air and warm air from the cold air intake 15 and the warm air intake 16 in order to keep the intake air temperature as constant as possible and rotate the engine normally. An intake air temperature control device 17 is provided, and an intake air temperature sensor 18 is provided to operate the device.
is arranged in the lower space 8, which is the clean side, and is attached to the bottom of the case l.

In addition, the bottom plate 1b of the body 1 is provided with an engine 19 that carries secondary air sent into high-temperature exhaust gas as an exhaust gas purification system.
An outlet 20 of a pipe introduced into the exhaust manifold portion 19a of the engine 19 and an outlet 21 of a return pipe that returns gas (vibro gas) leaking into the crankcase from a combustion chamber (not shown) of the engine 19 to the carburetor 10.
are provided for each.

Next, the present invention will be explained in detail.

The suction port 15 or 1 is controlled by the negative pressure type intake air temperature control device 17.
The cold air or warm air switched in from 6 enters the middle space 9 which is the dusty side, passes through the filtration element 4 from bottom to top, and is filtered. 4b, the lower space 8, and the outlet pipe 11 into the carburetor 10.

Next, other embodiments of the present invention will be described. Figure 2 (a
), (bl is a sectional view and a BB sectional plan view of the second embodiment of the present invention, in which the peripheral edge of the partition plate 70 in the first embodiment is extended upward into a cylindrical shape. A side surface portion 7d is formed at the upper end thereof, and a claw portion 7e is fixed to the upper end portion of the case 1 by adhesive or welding.Thereby, a ventilation portion 30 with a double structure is formed over the entire circumference of the side surface portion of the case l. The end plate 4 of the filtration element 4 and the gasket 5 are also provided with a communication part at a position that coincides with the ventilation part 30, and the structure is such that the cap 2 is tightened and fixed by bolts 3. The rest of the structure is the same as that of the first embodiment.Therefore, the upper space 6 and the lower space 8
In addition to the air port 13 provided in the center tube 4b, the air vents 30 communicate with each other through the ventilation section 30, which has the effect of significantly reducing the ventilation resistance of the air passing through the air purifier.

3 o(al, (bl) are a cross-sectional view and a plan view thereof for explaining the third embodiment of the present invention, in which the communication port 13 of the center cylinder 4b in the first embodiment is eliminated, and the side surface of the case is The structure includes a communication pipe 31 that communicates between the upper space 6 and the lower space 9. That is, the elongated hole 32 provided in the cap 2 communicates with the lower space 8 of the side IC of the case 1. The holes 33 provided in this manner are connected to each other by a resin or metal disconnection cross-shaped communication pipe 31.Thereby, the air intake passage into the engine 19 forms a two-stage expansion muffler. However, it has the effect of reducing intake noise.A two-stage expansion silencer is composed of a tube that has two expansion parts whose cross-sectional area increases, and in this case,
Of the ventilation system formed by the air inlet 14, the intermediate space 9, the upper space 6, the communication pipe 4b, the lower space 8, and the outlet pipe 11, the intermediate, upper space, and lower space form an expansion section. .

FIG. 4 shows the results of measuring intake noise of the conventional downflow type (solid line A), the first embodiment of the present invention (dotted chain line B), and the third embodiment of the present invention (dashed line C). It is something. It is clear that the third embodiment has the lowest noise level.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1(a) and 1(b) are a sectional view illustrating the configuration of a first embodiment of the present invention, and FIG. (a) and (b) are cross-sectional views explaining the configuration of the second embodiment and B-B in the same figure (a).
FIG. 3 (81, fb) is a sectional view and a plan view illustrating the configuration of the third embodiment, and FIG. 4 is a conventional downflow type, and FIG. It is a characteristic diagram which shows the measurement result of the noise level of. DESCRIPTION OF SYMBOLS 1... Case, 2... Cap, 4... Filtration element, 6... Upper space, 7... Partition plate, 8...
・Lower space, 9...Middle space, 13...Communication port,
14...Air introduction pipe.

Claims (1)

[Scope of Claims] An air purifier comprising an axial flow type filtration element that filters fluid in the axial direction of the body in a body consisting of a case and a cap, wherein the space below the filtration element of the case is arranged vertically. an upper space on the downstream side of the filtration element formed between the filtration element and the cap; a lower space on the downstream side of the filtration element formed between the partition plate and the case bottom plate; a communication part that communicates between an intermediate space on the upstream side of the filtration element and the upper space and the lower space, which is formed between the filtration element and the partition plate; and a communication part that is attached to the side surface of the case and communicates with the intermediate space An air purifier comprising: an air introduction section that communicates; and an air outlet section that is provided on the bottom plate of the case and that guides clean air from the lower space to the internal combustion engine.