JPH0842417A - Air cleaner - Google Patents

Abstract

PURPOSE:To eliminate any hindrance of a silencing action by installing a swirl vane on an inner wall at the tip of a suction pipe of an air cleaner, forming intake outside air into a swirl flow, while installing an exhaust port in a sense of the forward direction of this swirl flow on a pipe wall in the midway of a suction pipe and exhausting bulky dust and simultaneously setting a position of the exhaust port so as to make a distance from a pipe end become the specified value to length of the suction pipe. CONSTITUTION:A swirl vane 8 is installed on an inner wall at the tip of a suction pipe 2 of an air cleaner 1, turning intake outside air as in an arrow B, and bulky dust is exhausted in keeping it in the turning direction intact from an exhaust port 9 installed in an incline 10. In this case, this exhaust port may be installed plurally. Since a position of this exhaust port 9 is 1/2<n>L (n = integer) to suction pipe length L, it will not hinder the silencing effect of this air cleaner. Thus, there is almost nothing an expanded part in the suction pipe, so any burden on a filter element 6 is reduced as the air cleaner that is installable in a narrow space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner used for intake air of an internal combustion engine.

[0002]

2. Description of the Related Art A cyclone is provided in front of an intake pipe in order to remove coarse dust and water droplets by centrifugal separation before filtering dust of intake air with a filter medium in an air cleaner. No. 57-198555), or a suction pipe in which the tip end is enlarged and swirl vanes are provided (for example, Japanese Utility Model Laid-Open No. 56-45154).

[0003]

The former cyclone device has a large size, and the latter cyclone device has an enlarged suction pipe tip, which may not be mounted in a narrow space such as an automobile engine room. Further, the latter type has a large tip weight of the suction pipe, which causes a problem in the seismic resistance of the air cleaner.

[0004]

The air cleaner according to the present invention is provided with a swirl vane on the inner wall of the tip of the suction pipe for generating swirl flow in the suction air, and the distance from the end face of the suction pipe is 1/2 ⁿ (the length of the suction pipe). The suction pipe at the position of (n = integer) is provided with a discharge hole that opens in the direction in which the swirling flow advances.

[0005]

The air sucked into the suction pipe travels as a swirl flow by the swirl vanes at the inlet portion thereof. Of the dust contained in the air, particularly coarse particles and water droplets are strongly subjected to centrifugal force, swirl along the inner wall of the suction pipe, and are discharged from the discharge hole opened in that direction. Since the direction of the discharge hole is substantially the same as the flow direction of the swirling flow, the discharge of coarse dust and the like is efficiently ejected, and on the contrary, the outside air is hardly sucked from the discharge hole.

If a hole is provided at an arbitrary position on the wall of the suction pipe, the sound deadening effect of the air cleaner may be impaired. However, the position of the discharge hole is 1 mm from the end face of the suction pipe. By setting / 2 ⁿ (n = integer), the silencing action can be prevented, or it can be used as a tuning hole for silencing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In an air cleaner 1 for an internal combustion engine made of synthetic resin shown in FIG. 1, a body 3 having an intake pipe 2 and a cover 5 having an outlet pipe 4 sandwich a filter element 6 between their open ends. Then, they are joined by the clip 7. A plurality of swirl vanes 8 are formed at the tip of the suction pipe 2. Each swirl vane 8 rises in the axial direction from the inner wall of the distal end portion of the suction pipe 2, has a twist angle, and makes the outside air (arrow A) advancing straight into the swirl flow (arrow B). The suction pipe 2 is provided with a protrusion 11 having an inclined wall 10 having an outlet hole 9 opened therein. The inclined wall 10 is oriented in the direction perpendicular or nearly perpendicular to the advancing direction of the swirling flow (arrow B), and therefore the discharge hole 9 is opened in the advancing direction of the swirling flow.

The outside air sucked in as shown by an arrow A becomes a swirling flow by the swirl vane 8, and dust and water droplets contained in the outside air are also subjected to centrifugal force in the radial direction of the suction pipe, and especially for coarse dust and water droplets having a large mass. Centrifugal force works strongly, these are suction pipes 2
Since it advances along the inner wall of the sheet, it is discharged from the discharge hole 9 which is open in the direction of movement. The air containing the remaining fine dust advances in the direction of arrow C, is filtered by the filter element 6 and is sent out in the direction of arrow D toward the engine body.

The position of the discharge hole 9 is 1/2 L from the end face of the tip with respect to the suction pipe length L. In addition to the discharge hole 9, a protrusion 13 having the same distance 1 / 2L from the end face and having the discharge hole 12 may be provided at another position on the circumference. Or may be provided with a protrusion 15 of the same shape having a discharge hole 14 to the position of 1/2 ² L i.e. 1 / 4L from the base end side end surface of the suction pipe.
Further, unlike the illustrated discharge hole 16, a protruding portion may not be provided, and a discharge hole inclined with respect to the axial direction and the radial direction may be formed directly in the pipe wall. These discharge holes 12, 14, 1
The function of 6 is the same as that of the discharge hole 9. The number of these discharge holes may be one or plural in the suction pipe 2.

It is generally said that if a hole is provided at an arbitrary position in the suction pipe, it will hinder the muffling action of the air cleaner.
If an opening is provided at a position of 1/2 ⁿ L with respect to the suction length L as in this example, it acts like a tuning hole (for example, Japanese Utility Model Laid-Open No. 1-95566) that effectively suppresses noise. It can also promote the silencing effect. It does not become a hole that hinders the silencing effect at least.

[0011]

According to the present invention, coarse dust and water droplets are efficiently discharged from the intake air to the outside of the intake system by providing a swirl blade at the tip of the intake pipe and an inclined discharge hole at a specific position of the intake pipe. Therefore, the load on the filter element is reduced and the service life is extended. Moreover, since the structure is simple and there is almost no enlarged portion of the suction pipe, there is no layout problem when mounting in a narrow space, and no problem with vibration resistance. Furthermore, it can also be used as a tuning hole that does not hinder the muffling effect of the air cleaner, and makes the muffling effect effective under some conditions.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

[Explanation of symbols]

 8 swirl vanes 9, 12, 14, 16 discharge hole 10 inclined wall 11, 13, 15 protrusion

Claims (1)

[Claims] 1. A suction-shaped swirl vane that swirls the intake air is provided on the inner wall of the tip of the suction pipe, and the distance from the end face of the suction pipe is 1/2 ⁿ (n = integer) of the suction pipe length. An air cleaner in which a suction hole is provided in the suction wall of the suction pipe at the position, and the discharge hole opens in the traveling direction of the swirling flow.