JP2513220B2 - Cyclone type air cleaner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cyclone which first removes coarse dust from air supplied to a combustion chamber of an internal combustion engine by centrifugal separation and then filters fine dust with a filter element. Formula air cleaner.

[Prior Art] Generally, in a cyclone type air cleaner of this type, as described in JP-A-61-255258, an inlet is provided in a tangential direction of the casing, and sucked air is provided between the casing and the filtration element. By forcibly swirling and guiding the swirling flow to the end face below the casing, coarse dust in the air sucked from the inlet was centrifugally separated and collected in the lower part of the casing. Then, the dust collected in the lower portion of the casing is provided on the end surface of the casing by utilizing the intake pulsation during low rotation (for example, idling rotation) when the rotation speed (rotation speed per unit time) of the internal combustion engine is small. It was discharged from the dust discharge hole to the dust pan attached to the lower part of the casing.

[Problems to be Solved by the Invention] However, in the conventional cyclone type air cleaner as described above, dust is not discharged to the dust pan unless the internal combustion engine is rotated at a low speed for a long period of time, and thus accumulated in the casing. The volume of dust is large. Therefore, the accumulated dust may blow back due to a sudden change in the rotation speed of the internal combustion engine, vibration, etc., and the blown back dust may adhere to the filter element to shorten the life of the filter element. .

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cyclone type air cleaner having a high dust discharging effect.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cylindrical casing, a filtering element disposed in the casing, and a tangential direction of a cylindrical wall of the casing. An inlet for generating a swirling flow between the casing and the filtering element to suck air into the casing, an outlet provided in the casing and opened at an outlet of the filtering element, and the casing And a dust discharge hole for discharging dust centrifugally separated by the swirl flow, and the swirl flow flowing into the casing from the inlet in a spiral shape toward the dust discharge hole. The technical means comprises an inclined portion provided on the lower end surface of the casing.

[Operation] In the present invention having the above configuration, when the outlet is connected to the intake port of the internal combustion engine and the engine is started, the outside air is sucked into the casing from the inlet. At this time, by the inlet attached to the casing in the tangential direction,
The inflowing air becomes a forced swirl flow between the casing and the filter element, and the swirl flow descends toward the lower end surface of the casing. That is, the air sucked into the casing spirally swirls and flows toward the lower end surface of the casing. Then, the air that spirally swirls and is supplied below the casing flows along the inclined portion provided in the lower portion of the casing and is guided to the discharge hole.

On the other hand, the air that has flowed into the casing swirls between the casing and the filtration element, and coarse dust contained in the air is pressed against the inner wall surface of the casing by centrifugal force, which causes swirling flow and gravity. As a result, it descends toward the lower end surface of the casing along the inner wall surface. Then, the dust that has descended below the casing is guided to the discharge hole along the inclined portion provided in the lower portion of the casing.

As described above, since the air that has flowed into the casing and the dust separated by the centrifugal force are guided to the discharge hole by the inclined portion, they are guided to the discharge hole by the pressure of the air guided to the discharge hole. Dust is discharged from the discharge hole.

EFFECTS OF THE INVENTION According to the present invention, by providing the inclined portion which is inclined toward the discharge hole in a spiral shape, even when the internal combustion engine has a high rotation speed other than a low rotation speed or a middle rotation speed, the casing is provided in the casing. Since the dust can be discharged from the discharge hole by the flow of the air that is taken in, the dust discharging effect can be enhanced as compared with the conventional case.

Further, as a result, the accumulation of dust inside the casing is prevented, so that the blowback of dust due to the accumulation of dust is prevented, and the life of the filter element can be extended.

[Embodiment] Next, a cyclone type air cleaner of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a side sectional view of a cyclone type air cleaner.

A cyclone type air cleaner 1 for an internal combustion engine includes a casing 4 including a cylindrical case 2 and a bottom plate 3, and the casing 4 includes an inlet 5 serving as an air inlet in a tangential direction of a cylindrical wall, and a casing. An outlet 6 that serves as an air outlet is provided at the center of the upper end surface of 4. The inlet 5 and the outlet 6 are respectively opened in the casing 4, the inlet 5 is communicated with the outside air, and the outlet 6 is communicated with the intake port of the internal combustion engine. The inlet 5 is different from the casing 4 in
It is attached to the casing 4 with an inclination angle from obliquely above.

In addition, a hollow cylindrical filter element 7 for filtering fine dust is disposed in the casing 4. A U-shaped support 8 is provided in the hollow portion for fixing the filtering element 7 in the casing 4 and fixing the bottom plate 3 on the lower end surface of the casing 4 to the case 2.

The U-shaped support body 8 has its upper end fixed to the inner peripheral surface of the outlet 6 by spot welding or the like, and its lower end fixed to the bottom plate 3 with a fastener 9.

The upper end of the filter element 7 is held by the end plate 10, and the lower end thereof is held by the end plate 11.
A gasket 12 seals between the inner surface of the casing 4 and the casing 4, and a gasket 13 seals between the end plate 11 and the bottom plate 3. A gasket 14 seals between the outer peripheral end surface of the casing 4 and the outer peripheral end surface of the bottom plate 3.

At the outer peripheral position of the bottom plate 3, a dust discharge hole communicating with the outside is provided.
15 is opened, and the dust discharge hole 15 is provided with a rubber dust discharge valve 16 having a slit.
This dust discharge valve 16 is provided with a slit 16a which is closed when the pressure applied to the dust discharge hole 15 becomes a negative pressure.

Further, the bottom plate 3 is spirally formed between the outer peripheral surface of the filtration element 7 and the inner peripheral surface of the casing 4 along the inner peripheral surface of the casing 4 toward the dust discharge valve 16 as shown in FIG. It has an inclined portion 17 that is inclined. The spiral inclined portion 17 is provided by pressing the bottom plate 3.

On the other hand, on the inner peripheral surface of the casing 4, as shown in FIG. 2, a guide plate 18 having a substantially disc shape is provided so that the passage cross-sectional area of the opening of the inlet 5 is directed toward the downstream of the inflowing air flow. The filter element 7 is fixed at an angle toward the tangential direction of the filter element 7 so that the filter element 7 can be smoothly reduced. The guide plate 18 accelerates the air flowing from the inlet 5 when flowing into the casing 4. Further, air can flow in from a position farther from the center of the casing 4, and the guide plate 18 blocks a part of the filter element 7 from the air flow path of the air flowing in from the inlet 5. The air flowing in from does not directly contact the filter element 7. Therefore, when the filter element 7 is directly hit by the inflowing air,
The pressure loss of the filter element 7 is eliminated.

Next, the operation of the cyclone type air cleaner 1 will be described.

When the outlet 6 is connected to the intake port of the internal combustion engine and the engine is started, the outside air is sucked into the casing 4 from the inlet 5. At this time, the inflowing air is accelerated by the inlet 5 and the guide plate 18, which are attached to the casing 4 in a tangential direction and at an inclination angle from diagonally above, and spirally swirls to rotate the casing 4. It flows toward the lower end face. The air that swirls spirally and is supplied below the casing 4 flows along an inclined portion 17 provided in the lower portion of the casing 4 and is guided to the dust discharge hole 15.

On the other hand, the air that has flowed into the casing 4 swirls between the casing 4 and the filtration element 7, and coarse dust contained in the air is pressed against the inner wall surface of the casing 4 by a centrifugal force, so that the swirling flow acts. And due to the action of gravity, it descends toward the lower end surface of the casing 4 along the inner wall surface. Then, the dust that has descended below the casing 4 is
It is guided to the dust discharge hole 15 along the spiral inclined portion 17 provided in the lower portion of the casing 4.

At this time, when the rotation of the internal combustion engine increases and the flow velocity of the air sucked from the inlet 5 into the casing 4 increases, the flow of the intake air is increased by the inclined portion 17 due to the dust discharge hole 15
Is guided to open the slit 16a of the dust discharge valve 16 by expanding it. As a result, the dust guided to the dust discharge hole 15 is discharged from the dust discharge valve 16.

Further, when the internal combustion engine has a low rotational speed and is at a low speed, the intake pulsation causes the slit 16a of the dust discharge valve 16 to spread and open, and the dust introduced into the dust discharge hole 15 is discharged to the dust discharge valve.
Emitted from 16.

When the air from which the coarse dust has been centrifugally separated passes through the filter element 7, the fine dust that has not been centrifugally separated is removed and cleaned. The purified air passes through the central portion of the filter element 7, passes through the outlet 6, and is sucked into the combustion chamber of the internal combustion engine.

As described above, by providing the bottom plate 3 with the spiral inclined portion 17, the dust discharging effect is further enhanced. Further, since the dust discharge effect is enhanced, the amount of dust accumulated on the bottom plate 3 also serving as a dust pan is reduced, and the accumulated dust is blown back due to a sudden change in the rotational speed of the internal combustion engine, vibration, etc. Very unlikely to adhere to. As a result, the life of the filter element 7 is extended.

The flow of air taken into the cyclone type air cleaner 1 is shown by solid arrows in FIGS. 1 and 2.

 FIG. 4 shows a second embodiment of the present invention.

In this embodiment, the spiral inclined portion 17 is formed separately from the bottom plate 3 and fixed to the bottom plate 3 by spot welding or the like.

In the above embodiment, the inlet to the casing,
By installing with an inclination angle from diagonally above,
Although the swirl flow is guided to the bottom plate, an inclined plate may be provided inside the outlet of the inlet or inside the casing to guide the swirl flow to the bottom plate.

Further, the flow of the air flowing into the casing is accelerated by the guide plate, but it may be accelerated by narrowing the outlet of the inlet.

Further, the dust discharging effect can be further improved by adjusting the suction inclination angle of the air flowing into the casing from the inlet, the attachment angle of the guide plate, and the inclination angle of the spiral inclined portion.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention.
The figure is a side sectional view of a cyclone type air cleaner, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a perspective view of a spiral inclined portion, and FIG. 4 is a second embodiment of the present invention. FIG. 3 is a perspective view showing an example and showing a spiral inclined portion. In the figure, 1 ... Cyclone type air cleaner, 4 ... Cylindrical casing, 5 ... Inlet, 6 ... Outlet, 7 ... Filtration element, 15 ... Dust discharge hole, 17 ...
... Spiral slope

Claims (1)

(57) [Claims] 1. A cylindrical casing comprising: (a) a cylindrical casing; (b) a filter element disposed in the casing; (c) a tangential direction of a cylindrical wall of the casing;
An inlet for generating a swirling flow between the casing and the filtering element to suck air into the casing; (d) an outlet provided in the casing and opened at an outlet of the filtering element; e) a dust discharge hole provided on the lower end face of the casing for discharging dust centrifugally separated by the swirl flow; and (f) the swirl flow flowing into the casing from the inlet, A cyclone type air cleaner comprising: an inclined portion provided on a lower end surface of the casing which is spirally guided toward