JPH034367Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a pre-cleaner that preliminarily removes dust from air supplied to an air cleaner.

<Prior art and its problems> This type of pre-cleaner is usually installed in the air introduction passage of an engine air cleaner, and creates a vortex in the introduced air to remove relatively large mass of dust using centrifugal force. ing. As such a pre-cleaner, there is, for example, one shown in Japanese Utility Model Application Publication No. 118753/1983. In such a precleaner, it is necessary to capture the dust that is pushed toward the inner circumference of the precleaner case by centrifugal force. For example, the dust is collected by dropping it into a dust reservoir from a collection hole formed in the precleaner case. It is starting to be collected.

By the way, since such a pre-cleaner causes a vortex in the air, a vortex sound is generated at this time, which is a cause of noise. Therefore, in order to remove this swirl noise, it is possible to reduce noise by installing a soundproof wall around the outer circumference of the precleaner, but in this case, the soundproofing device would have to be larger and the precleaner would have to be Since the intake port communicates with the outside, there was a problem in that sufficient noise reduction could not be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pre-cleaner based on the principle of air column resonance that uses a dust reservoir as a resonator to significantly reduce noise without adding any additional soundproofing device.

<Means for Solving the Problems> In order to achieve the above object, the present invention is provided in the air introduction passage of the air cleaner, and generates a vortex in the introduced air in the pre-cleaner case, and the centrifugal force generated at this time causes the pre-cleaner to move. In a pre-cleaner configured to collect dust guided in the inner circumferential direction of the case from a dust collection hole formed in the pre-cleaner case to a dust reservoir provided on the outside of the pre-cleaner case, the dust collection hole and The dust reservoir section is connected via a pipe body, and the dust reservoir section is configured to also function as a resonator.

<<Function>> With the above configuration, the present invention uses the dust reservoir as a resonator to effectively muffle the whirlpool sound of air generated within the pre-cleaner case, and also allows the existing dust reservoir to be used also as a resonator. This prevents the addition of a new device to eliminate eddy noise, which also leads to miniaturization of the precleaner.

<<Example>> Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 4 show a precleaner 10 showing an embodiment of the present invention, and this precleaner 10 is installed in an air introduction passage 14 of an engine air cleaner 12.
It is set in. That is, the precleaner 10 has a precleaner case 16 attached to the outer periphery of the air intake side end of the air introduction passage 14, and the precleaner case 16 includes the air introduction passage 1.
An air intake port 18 is formed at the end opposite to the air introduction passage 14, and is separated in the central axis direction by a partition wall 20 which also serves as a closing plate for closing the open end of the air introduction passage 14. The partition wall 20 between the air introduction passage 14 and the pre-cleaner case 16 has a second
As shown in the figure, an opening 22 and a cyclone blade 24 cut and formed from the opening 22 are formed, and a through hole 26 is formed on the outer periphery of the air introduction passage 14 located inside the pre-cleaner case 16. The air is formed in the air intake port 1 of the pre-cleaner case 16 during the air intake stroke of the engine.
8. The air is drawn into the air introduction passage 14 of the air cleaner 12 through the opening 22 of the partition wall 20 and the through hole 26.

On the other hand, at the end of the pre-cleaner case 16 on the air cleaner 12 side (right side in the figure), a dust collection hole 28 is formed in the tangential direction of the inner circumference of the pre-cleaner case 16, as shown in FIG. This dust collection hole 28 is connected to a dust reservoir section 32 via a tube body 30. This dust reservoir part 32 is connected to a container 36 and a cap 38 via a hook 34.
The container 36 can be separated from the cap 38 by removing the hook 34.

Therefore, in the pre-cleaner 10, the air is separated from the partition wall 2.
When passing through the opening 22 of 0, the cyclone blade 24
This generates a vortex along the inner periphery of the pre-cleaner case 16, and this vortex pushes the dust with a relatively large mass towards the inner periphery of the pre-cleaner case 16 by centrifugal force, and finally the dust collection hole 28.
from there to the dust reservoir section 32.

By the way, in the present invention, the length of the tube 30 connecting the dust collection hole 28 and the dust reservoir section 32 and the volume of the dust reservoir section 32 are appropriately adjusted in advance, and the sound introduced from the dust collection hole 28 is reduced. The dust reservoir 32 forms a so-called resonator so as to effectively muffle sound.

Therefore, in the precleaner 10 of this embodiment, the eddy sound generated by the cyclone blades 24 is effectively suppressed when the dust is introduced from the dust collection hole 28 through the pipe body 30 into the dust reservoir section 32. The sound is muffled, and leakage of the eddy sound to the outside as noise is prevented or significantly reduced.

<<Effects of the invention>> As explained above, the precleaner of the present invention functions not only as a dust collecting means but also as a resonator due to the dust reservoir and the tube connecting the dust reservoir to the dust collection hole. Therefore, the resonator function effectively muffles the swirling sound of the precleaner, and prevents or significantly reduces noise generation. In addition, since the dust reservoir can also be used as a resonator, there is no need for a special device for muffling the vortex noise, making it possible to downsize the pre-cleaner and simplify its structure. It has various excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pre-cleaner showing an embodiment of the present invention, FIG. 2 is a sectional view taken from the line - in FIG. 1, and FIG. 3 is a sectional view of the main part taken from the line - in FIG. FIG. 4 is an overall schematic diagram showing an embodiment of the air cleaner equipped with the pre-cleaner of the present invention. 10... Precleaner, 12... Air cleaner, 14... Air introduction passage, 16... Precleaner case, 24... Cyclone blade, 28...
Dust collection hole, 30... pipe body, 32... dust reservoir section.

Claims (1)

[Scope of utility model registration request] A dust collection hole is provided in the air introduction passage of the air cleaner and is formed in the pre-cleaner case to generate a vortex in the introduced air within the pre-cleaner case and collect dust guided in the inner circumferential direction of the case by centrifugal force at this time. In the pre-cleaner configured to collect dust from the dust to a dust reservoir provided on the outside of the pre-cleaner case, the dust collection hole and the dust reservoir are connected through a pipe body, and the dust reservoir also serves as a resonator. Precleaner is characterized by the fact that it did.