JP2541967Y2 - Cyclone type air cleaner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cyclone type air cleaner used in an engine of a vehicle for dusty areas, in which a mechanism for separating dust by a centrifugal effect is combined with an air cleaner.

[0002]

2. Description of the Related Art FIGS. 5A to 5C show a conventional cyclone-type air cleaner.
No. 467). In the conventional air cleaner 1 shown in FIGS. 5 (a) and 5 (c), an inlet pipe 3 is connected to the side surface of a cylindrical outer cylinder 2 so as to be able to communicate with the inside. A cylindrical filter element 4 is provided. A disk-shaped lid is fixed to both ends of the outer cylinder 2, and an outlet pipe 5 is connected to one of the lids so as to be able to communicate with the inside. Guide vanes (cyclone blades) 6 are disposed at an air inlet portion on the inner periphery of the outer cylinder 2, and air W flowing from the inlet pipe 3 is spirally formed on the inner surface of the cylindrical outer cylinder 2 by the guide vanes 6. (A spiral flow is generated), and most of the moisture and dust in the air W are separated by centrifugal force. Further, the air W is cleaned by the filter element 4 and supplied to the engine through the outlet pipe 5. In the air cleaner 1, the width m of the swirl flow path 7 at the air inlet is extremely narrower than the diameter M of the inlet pipe 3, so that the air W flowing from the inlet pipe 3 is reduced to the width m of the swirl flow path 7. There is a disadvantage that the airflow resistance when flowing in is large.

The conventional air cleaner 11 shown in FIG. 5 (b) eliminates the drawbacks of the air cleaner 1 having a large air flow resistance and reduces the air flow resistance. Air cleaner
The 11 inlet pipe 13 has a neutral shaft with an air cleaner
The downstream flow path 18 of the inlet pipe 13 is sequentially narrowed so as to be offset from the outer cylinder 12 of FIG. While the air W flowing from the inlet pipe 13 is swirled at a high speed on the inner surface of the outer cylinder 12, most of the moisture and dust are separated by centrifugal force. Therefore, the air W flowing into the swirling flow path 17 has a reduced airflow resistance as compared with the air cleaner 1. Further, the air W is cleaned by the filter element 14 and supplied to the engine through the outlet pipe 15.

[0004]

[Problem to be Solved by the Invention] If the neutral axis of the inlet pipe 13 is offset from the outer cylinder 12 of the air cleaner 11 as in the conventional cyclone type air cleaner 11, the air flow resistance is reduced and good results are obtained. Can be However, the length from the center of the outer cylinder to the outer end of the inlet pipe is L in the case of the air cleaner 1, but the length is
In the case of 11, it is [L + ΔL], which is larger by ΔL. Depending on the position of the air cleaner in the vehicle, there are cases where the length cannot be increased by ΔL even if the length is to be increased by ΔL due to interference with the bed of the vehicle. In this case, if the guide blades (cyclone blades) are removed, the ventilation resistance is reduced, but the cyclone efficiency is reduced.

In the present invention, the neutral axis of the inlet pipe cannot be offset from the outer cylinder of the air cleaner due to the mounting position of the cyclone type air cleaner on the vehicle (the length from the center of the outer cylinder to the outer end of the inlet pipe). Is not increased by ΔL.) In this case, it is a technical problem to reduce the airflow resistance without removing the guide vanes and performing the offset without offsetting.

[0006]

According to the present invention, an inlet pipe is connected to a side surface of a cylindrical outer cylinder, and a cylindrical filter element is provided inside the outer cylinder. In a cyclone type air cleaner in which an outlet pipe is connected to a lid at an end of an outer cylinder, an expansion part 29 having a shape having a smooth curve and sequentially expanding and sequentially reducing is formed in a downstream portion of the inlet pipe. is there. Note that guide vanes (cyclone blades) can be provided at the air inlet portion on the inner periphery of the outer cylinder.

[0007]

[Function] The air flowing from the inlet pipe flows in with low airflow resistance and spirals at high speed on the inner surface of the cylindrical outer cylinder. Most of the water and dust in the air are separated by centrifugal force. Is done. Further, the air is cleaned by the filter element and supplied to the engine through the outlet pipe.

[0008]

FIG. 1 shows a cyclone type according to an embodiment of the present invention.
An air cleaner 21 is shown, and an inlet pipe 23 is connected to a side surface of a cylindrical outer cylinder 22 so as to be able to communicate with the inside.
A cylindrical filter element 24 is disposed inside the filter. A disc-shaped lid is fixed to both ends of the outer cylinder 22, and an outlet pipe 25 is connected to one of the lids so as to be able to communicate with the inside. In order to reduce the airflow resistance when the air W flowing from the inlet pipe 23 flows into the swirl flow path 27, an expansion having a smooth curve and a gradually expanding and gradually reducing shape is provided downstream of the inlet pipe 23. Form part 29. As shown in FIG. 1, the inflated portion 29 has a maximum swelling at a portion slightly above the center of the outer cylinder 22, and has a length from the center of the outer cylinder 22 to the outer end (maximum inflated portion) of the inlet pipe. Is L ′. Inlet pipe 23
W flows from the swirl channel under low ventilation resistance
27, and a cylindrical outer cylinder
It is spirally turned at high speed on the inner surface of 22 (spiral flow is generated),
Most of the moisture and dust in the air W are separated by centrifugal force. Further, the air W is cleaned by the filter element 24 and supplied to the engine through the outlet pipe 25.

FIGS. 2 (a) and 2 (b) show cross sections taken along the line AA of FIG. 1, and there are cases where the cross section of the expanded portion 29 is arc-shaped (a) and where it is substantially rectangular (b). FIG. 3 is a graph showing the relationship between the amount of expansion (L'-L) of the expanding portion 29 and the airflow resistance, wherein the inner diameter of the inlet pipe 23 is 109.6 mm,
Under the conditions of 272.3 mm, the length of the outer cylinder 22 of 364 mm, the cyclone blade mounting angle of 0 ° (reference position), and the air flow rate of 143 m ³ / min, the expansion amount of the expansion portion in FIG. This was obtained by an experiment conducted. Compared to the ventilation resistance of 284 mmAq when the expansion amount is 0, it is 24 when the expansion amount is 17.5 mm.
It was 3 mmAq, indicating that the ventilation resistance was reduced by about 15%.

FIG. 4 shows an example in which the cyclone type air cleaner 21 of the present invention is mounted on a small truck.
In this case, it is mounted at a position between the loading platform 30 and the cabin 31. If the conventional air cleaner 11 is used to reduce the ventilation resistance and the neutral axis of the inlet pipe 13 is offset from the outer cylinder of the air cleaner 11, the length from the center of the outer cylinder 12 to the outer end of the inlet pipe 13 is L + ΔL And the space of the air cleaner 11 is larger than the air cleaner 1 by ΔL, and the space between the carrier 30 and the cabin 31 is Δ
It becomes longer by L, and the carrier 30 becomes smaller by that amount. Since it is not allowed to make the bed 30 small only for the purpose of reducing the airflow resistance of the air cleaner, the conventional air cleaner 11 cannot be mounted. Therefore, looking at the possibility of mounting the cyclone type air cleaner 21 of the present invention, the length from the center of the outer cylinder 22 to the outer end (expanded portion 29) of the inlet pipe 23 is L ', and the length L' Is much shorter than the length L + ΔL and the length L (air cleaner 1
Is very close to). (In the air cleaner 21 used in the experiment of FIG. 3, the expansion amount is 12.3 mm for the inner diameter of the outer cylinder 22 of 272.3 mm.
7.5 mm. Therefore, a light truck equipped with the air cleaner 1 may be replaced with the air cleaner 21 instead of the air cleaner 1.
It is possible to install the air cleaner 21 without changing the space between the carrier 30 and the cabin 31.
There is an advantage that the ventilation resistance can be reduced.

[0011]

[Effect of the Invention] According to the present invention, the neutral axis of the inlet pipe cannot be offset from the outer cylinder of the air cleaner due to the mounting position of the cyclone type air cleaner on the vehicle (from the center of the outer cylinder to the outer end of the inlet pipe). In the case where the length cannot be increased by ΔL.), The length from the center of the outer cylinder to the outer end of the inlet pipe is changed from L without the offset to L ′ without offset, although the offset is not performed. L ′ is considerably shorter than the length L + ΔL when offset.) The same reduction in airflow resistance as when offset is obtained is obtained. And since the lengths L and L 'are very close lengths, the air cleaner of the present invention is mounted within the range of the mounting layout of the conventional air cleaner without offset, without losing the function of the cyclone type air cleaner. It is possible to reduce the ventilation resistance.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a graph showing a relationship between an expansion amount of an inlet pipe and a ventilation resistance.

FIG. 4 is a diagram showing a vehicle mounting position of the air cleaner of the present invention.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 21 Cyclone type air cleaner 22 Outer cylinder 23 Inlet pipe 24 Filter element 29 Inflated part

Claims (1)

(57) [Scope of request for utility model registration] An inlet pipe is connected to a side surface of a cylindrical outer cylinder, a cylindrical filter element is provided inside the outer cylinder, and an outlet pipe is connected to a lid at an end of the outer cylinder. The cyclone type air cleaner according to claim 1, wherein an inflatable portion having a smooth curve and having a shape gradually increasing and decreasing sequentially is formed in a downstream portion of the inlet pipe.