JPS6315577Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cleaner that communicates with a carburetor to filter intake air and guide it to the carburetor.

Conventionally, in portable small two-stroke engines such as chemical sprayers, in order to increase output,
Because the intake timing was advanced, fuel was blown back during operation, and this fuel adhered to the air cleaner, causing it to become clogged faster, causing various problems such as poor acceleration and difficulty in restarting. For this reason, an attempt was made to prevent fuel from blowing back into the air cleaner by installing a blowback prevention plate in the intake passage, but the position, size, configuration, etc. of the plate were inappropriate and the blowback prevention was not sufficiently prevented. Nakatsuta.

In this invention, the interior of the air cleaner is divided by a partition wall, and the partition wall is provided to spray the blown back fuel, so that it can also serve as a blow back prevention plate and can be provided over a large area. By flowing around the lower end of the wall, the intake passage is long and curved to buffer blowback air against the air cleaner and prevent blowback fuel from adhering to the air cleaner.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is an air cleaner, which is constructed as follows. That is, the main body case 7 connected to the intake port 5 of the carburetor 3, and the main body case 7
An outer wall 13 is formed by a lid part 11 that is removably engaged with and fixed by bolts 9, and the interior is divided into a first chamber 17 and a second chamber 19 by a partition wall 15. . Reference numeral 21 denotes an opening provided in the outer wall 13 at a position facing the partition wall 15 in the upper part of the first chamber 17, and communicates with an intake port (not shown) of the carburetor 3. Reference numeral 23 denotes a filter body which is supported in the second chamber 19 by support pieces 25, 25 protruding from the partition wall 15 via a bottom portion 27 for an appropriate distance, and is sandwiched between the filter body 23 and the lid portion 11. Reference numeral 29 indicates a communication path that communicates between the intermediate part 27 and the first chamber 17 at the lower end of the partition wall 15 in a direction parallel to the partition wall 15;
The chamber 19 communicates with the atmosphere through an intake hole provided in the lid 11 at a position facing the partition wall 15. 33 is a drain plug provided at the bottom of the first chamber 17.

In the above embodiments, the engine (not shown)
Due to the suction force, the air enters the second chamber 19 from the intake holes 31, 31, ..., passes through the filter body 23,
After passing through the gap 27, the communication path 29, and the first chamber 17, it is sucked into the vaporizer 3 through the opening 21. When this intake air blows back, the blowback air collides with the partition wall 15 and is buffered, changes its direction and heads downward, and then changes its direction and enters the second chamber 19 through the communication path 29. Since the passage between them is long and the direction changes, the blowback wind is buffered and slows down, and it takes time. During this time, the engine (not shown) changes from the blowback state to the suction state and moves in the opposite direction. The air cleaner 23
The engine turns back before the blowback wind reaches the engine, and the contained fuel adheres to the inner wall of the first chamber 17.
One part enters the gap 27 and adheres to the inner wall, flows down along the wall surface and accumulates at the bottom, is vaporized again by the intake air, and is sucked into the engine.

Since the present invention has the configuration as described in the claims, the partition wall also serves as a blowback prevention plate, so that the blowback prevention plate can have a large area, and the passage for the blowback wind to reach the filter body can be increased. The filter is long and bent to prevent blowback wind from blowing against the filter, thereby preventing engine malfunction due to clogging of the filter.

Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention. Explanation of the symbols representing the main parts of the drawing, 3...
Vaporizer, 13... Outer wall, 15... Partition wall, 17...
...First chamber, 19...Second chamber, 21...Opening, 2
3...filter body, 27...intermediate section, 29...communicating passage, 31...intake hole.

Claims (1)

[Scope of utility model registration request] The interior is divided into a first chamber 17 and a second chamber 19 by a partition wall 15, and a vaporizer 3 is installed on the outer wall 13 of the first chamber 17 at a position facing the partition wall 15.
A filter body 23 is provided in the second chamber 19 via an appropriate gap 27 between the partition wall 15 and the gap 27 at the lower end of the partition wall 15. The partition wall 15 of the second chamber 19 is provided in communication with the first chamber 17.
An air cleaner characterized in that intake holes 31, 31, . . . communicating with the atmosphere are provided on the outer wall 13 at a position facing the air cleaner.