JPH0526295Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for preventing water from being sucked into the air cleaner together with atmospheric air in an air cleaner for an internal combustion engine.

[Prior Art and its Problems] In an air cleaner for an internal combustion engine, when atmospheric air is sucked into the air cleaner, water such as rainwater may be sucked in together with the atmospheric air.

Therefore, Japanese Utility Model Application Publication No. 60-110668 as a prior art discloses that a drain box is provided in the middle of the atmospheric air intake pipe to the air cleaner, and the inside of the drain box is formed into a zigzag passage with a plurality of partition plates. , proposes to separate the water sucked in together with the intake air into the air cleaner in the drain box.

However, forming a zigzag passage inside the drain box using multiple partition plates has a good separation performance for the water that is sucked in together with the intake air to the air cleaner, but the flow of atmospheric air is Since the direction is changed several times within the engine, there is a problem in that the flow resistance of the air is large, which in turn increases the intake resistance of the air to the internal combustion engine, resulting in a decrease in the output of the internal combustion engine.

Also, Utility Model Application No. 60-87365 as another prior art
The publication states that a drainage box equipped with a partition plate for gas-liquid separation is connected to the tip of the atmospheric air intake pipe to the air cleaner, and an atmospheric air intake port is opened horizontally on the side of this drainage box. It is described that the device is provided in such a manner that atmospheric air is taken in from the horizontal atmospheric air intake port.

However, in this case, the air flowing into the draining box from the horizontal atmospheric air intake port collides with the partition plate, causing a sudden change in direction from a horizontal flow to a downward flow. At the lower end of the partition plate, the air flow suddenly changes direction from a downward flow to an upward flow, and due to this two sudden direction changes,
The same problems as those described above were caused by the increased resistance of the air flow.

The present invention provides an apparatus that can reliably separate water with little air flow resistance.

[Means for solving problems]

In order to achieve this purpose, the present invention has the tip of the atmospheric air intake pipe to the air cleaner in an internal combustion engine oriented horizontally and connected to the side of a drain box, and the bottom plate of the drain box has a drain hole. On the other hand, a slit-shaped atmospheric air inlet that opens upward is provided on the side of the draining box at a portion farther from the opening of the atmospheric air intake pipe, and a slit-shaped atmospheric air intake port that opens upward is provided at a portion of the draining box that is lower than the top surface of the atmospheric air intake pipe. A partition plate is provided in the drainage box and extends in a direction substantially perpendicular to the axis of the atmospheric air intake pipe. The inlet pipe is provided to communicate with the bottom of the drain box, and the lower end of the partition plate is curved in the direction of the atmospheric air intake pipe.

[Functions and effects of the idea]

In this configuration, the air flowing into the draining box from the atmospheric air inlet that opens upward flows from above in a downward direction due to the presence of the partition plate, and then flows from below upward at the lower end of the partition plate. After changing its direction into a flow, it flows out from the atmospheric air intake pipe toward the air cleaner, while the water separated from the air in the draining box accumulates at the bottom of the draining box, and then flows through the drain hole provided in the bottom plate of the draining box. is discharged outside.

In this case, by configuring the atmospheric air inlet to open upward instead of sideways as in the prior art, the number of changes in the air flow direction within the draining box is reduced by one time; By configuring the upwardly opening atmospheric air inlet into a slit shape extending in a direction substantially perpendicular to the axis of the atmospheric air intake pipe, the flow velocity of atmospheric air flowing into the draining box is slowed down. The flow resistance inside the draining box can be reduced, and by locating the atmospheric air inlet at a location lower than the top surface of the draining box, the atmospheric air inlet is substantially Since it is inclined toward the top surface and its cross-sectional area increases, the air inflow resistance when atmospheric air flows into the atmospheric air inlet is This can be reduced compared to when the opening is opened.

In addition, by curving the lower end of the partition plate in the direction of the atmospheric air intake pipe, it is possible to gently change the direction of the air flow from a downward flow to an upward flow, The resistance required for direction change can be reliably reduced compared to the above-mentioned prior art.

Therefore, according to the present invention, although the intake of water into the air cleaner can be reliably prevented by the drainage box, the atmospheric air intake port is opened upward and has a slit shape, and the atmospheric air intake port is provided with a drainage box. The combination of the fact that the box is located lower than the top of the box and the bottom edge of the partition plate is curved can greatly reduce the flow resistance of atmospheric air when it passes through the box, which reduces internal combustion. This has the effect of reliably reducing a decrease in output due to an increase in intake resistance in the engine.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates an air cleaner for an internal combustion engine (not shown), and reference numeral 2 indicates the air cleaner 1.
The atmospheric air intake pipes are oriented generally horizontally, and reference numeral 3 indicates a drain box connected to the tip of the atmospheric air intake pipes 2.

A drain hole 5 is bored in the bottom plate 4 of the drain box 3, and the atmospheric air intake pipe 2 of the drain box 3 is provided with a drain hole 5.
A slit-shaped atmospheric air intake port 7 that opens upward is provided on the side surface of the more distant part, and extends in a direction substantially perpendicular to the axis 2a of the atmospheric air intake pipe 2 at a lower part of the draining box 3 than the top plate 6. Provided as follows.

On the other hand, a partition plate 8 that is vertical and extends in a direction substantially perpendicular to the axis 2a of the atmospheric air intake pipe 2 is inserted into the drain box 3 from the atmospheric air intake port 7. By positioning the lower end 8a appropriately above the upper surface of the bottom plate 4 of the draining box 3, the atmospheric air intake port 7 and the atmospheric air intake pipe 2 are configured to communicate with each other at the bottom of the draining box 3. do.

Further, the lower end 8a of the partition plate 8 is curved toward the atmospheric air intake pipe 2.

The partition plate 8 is detachably attached to the top plate 6 of the drainer box 3 with bolts 9 or the like.

In this configuration, air flowing into the draining box 5 from the atmospheric air inlet 7 flows downward from above due to the presence of the partition plate 8, and then flows upward from below at the lower end of the partition plate 8. After changing the flow direction to the flow direction, the water flows out from the atmospheric air intake pipe 2 to the air cleaner side, while the water taken in together with the atmospheric air is separated from the air and accumulates at the bottom of the drain box 3. The water is drained out of the drain box 3 through the drain hole 5.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view, and FIG. 2 is a partially cutaway plan view of FIG. 1. 1...Air cleaner, 2...Atmospheric air intake pipe,
3...Draining box, 4...Bottom plate, 5...Drain hole, 6
...Top plate, 7... Atmospheric air inlet, 8... Partition plate, 8a... Lower end of partition plate.

Claims (1)

[Scope of utility model registration request] The tip of the atmospheric air intake pipe to the air cleaner in an internal combustion engine is oriented horizontally and connected to the side of a drain box, and a drain hole is provided in the bottom plate of the drain box. A slit-shaped atmospheric air inlet that opens upward is provided on the side surface of the air intake pipe at a portion farther from the opening, and extends in a direction substantially perpendicular to the axis of the atmospheric air intake tube at a portion lower than the top surface of the draining box. set up so that
and a partition plate extending in a direction substantially perpendicular to the axis of the atmospheric air intake pipe is provided in the draining box so that the atmospheric air intake port and the atmospheric air intake pipe communicate with each other at the bottom of the draining box, A water suction prevention device for an air cleaner for an internal combustion engine, characterized in that the lower end of the partition plate is curved in the direction of the atmospheric air intake pipe.