JP2513229B2 - Air cleaner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cyclone type air cleaner used in automobiles, particularly trucks.

[Conventional technology]

The conventional cyclone type air cleaner is actually 58-1148
As shown in Japanese Patent Publication No. 66, air containing dust is introduced from an inlet connected in a tangential direction in a cylindrical casing, and this air is formed between the casing and a filter body housed in the casing. It is forcibly swirled in the swirling flow passage, the centrifugal force at this time separates the dust contained in the air by the centrifugal force, the air separated from this dust passes through the filter (filter), and then the outlet. It is designed to be introduced into the intake passage of the engine from.

The dust separated in the swirl flow passage is due to its own weight,
Alternatively, it is forcibly dropped to the bottom of the casing, that is, the lower part of the swirl flow passage by the guide plate, and is removed to the outside from the dust valve installed in the lower part of the casing, or it is stored in the dust cup from the notch opening in the bottom of the casing. It was supposed to be done.

[Problems to be solved by the invention]

However, as in the above-mentioned conventional case, the dust separated in the swirling flow path is dropped to the casing bottom surface by its own weight,
There is a problem that the discharge efficiency is not good in the case of discharging the dropped dust. That is, the dust separated by the centrifugal force due to the swirl in the swirl flow passage is in the swirl flow atmosphere while falling on the bottom surface of the casing due to its own weight, and therefore, the dust during the fall may be swept back into the swirl flow and be mixed into the air. However, there is a defect that the performance of discharging the separated dust is low.

Further, in the case where the dust separated by the swirling flow is forcibly guided to the bottom surface of the casing by the guide plate, the guide plate is particularly required, the number of parts increases, the structure becomes complicated, and the guide plate is installed in the swirling flow passage. Therefore, there is also a drawback that the casing becomes large.

An object of the present invention is to provide an air cleaner that employs a simple structure and that has good discharge efficiency of separated dust, and thus has high dust separation efficiency as a whole.

[Means for solving problems]

In the present invention, a dust discharge hole is opened on the downstream side of the inlet in the casing in the swirling flow direction, the doub discharge hole is elongated along the axial direction of the casing, and the dust discharge hole is tangential to the casing. It is characterized in that a dust guide tube of a dust collector extending in the direction is connected.

[Action]

According to the present invention, the air introduced through the inlet is swirled in the swirling flow passage between the casing and the filter, and the swirling flow separates the dust contained in the air by the centrifugal force. Is discharged from the dust discharge hole through the dust guide tube to the dust collector by the inertia of the swirling flow. Since the dust discharge hole is elongated along the axial direction of the casing, it is possible to effectively guide the swirling dust in the casing in a swirling flow, thus improving the discharge efficiency of the separated dust. Become.

〔Example〕

The present invention will be described below based on an embodiment shown in FIGS. 1 to 7.

In the figure, reference numeral 1 denotes a casing of a cyclone type air cleaner for an internal combustion engine, which has a cylindrical shape with its upper end closed and its lower end opened. An inlet 2 for sucking external air is tangentially extended to and connected to a side wall of the casing 1, and the inlet 2 is open in the casing 1. Guide plate 3 in inlet 2
As shown in FIG. 1, the guide plate 3 has a function of constricting the inlet 2 so that the cross-sectional area of the flow passage is gradually decreased toward the intake downstream direction.

An outlet 4 for discharging intake air introduced from the inlet 2 is connected to an upper closed wall of the casing 1 and is located at the center, and the outlet 4 is open at the center of the casing 1. A U-shaped support 5 is fixed to the outlet 4, and the U-shaped support 5
Is located in the center of the casing 1.

Further, the outlet 4 is connected to an intake passage of an internal combustion engine (not shown).

The lower end opening of the casing 1 is closed by a closing plate 6 so that it can be opened and closed. The closing plate 6 is detachably attached to the lower end of the U-shaped support 5 with a thumbscrew 7.

A gasket 8a is interposed between the lower end opening edge of the casing 1 and the peripheral edge of the closing plate 6 to maintain airtightness.

A filter body 9 (filter) is housed in the casing 1. The filter body 9 has a cylindrical shape that surrounds the U-shaped support body 5, is substantially concentrically provided in the casing 1, and is sandwiched between the upper end wall of the casing 1 and the closing plate 6. Worn. Gaskets 8b and 8c are provided on the upper and lower ends of the filter body 9 to maintain airtightness between the upper end wall of the casing 1 and the closing plate 6.

A donut-shaped space is formed between the inner surface of the casing 1 and the outer surface of the filter body 9, and this space constitutes a swirl flow passage 10. The downstream end of the inlet 2 communicates with the swirl flow passage 10.

A dust discharge hole 11 is formed on the side wall of the casing 1 downstream of the inlet 2 in the swirling flow direction.
The dust discharge hole 11 is formed on the downstream side of the inlet 2 in the swirling flow direction by about 1/4 or 3/4 of the circumference of the casing 1.
Reference numeral 11 denotes an elongated opening extending over the entire axial length of the casing 1.

A dust collector 12 is connected to the dust discharge hole 11. The dust collector 12 is composed of a dust guide tube 13 and a dust exhaust valve 14 attached to this tip. The dust guide tube 13 is connected to the doub discharge hole 11 described above,
In this case, the dust guide tube 13 is connected along the tangential direction of the casing 1 so as to extend downstream of the swirling flow. Further, the dust guide tube 13 is narrowed so that the cross-sectional area of the flow path is gradually reduced toward the downstream side. Dust valve 14 attached to the tip of this throttle
Has a cup shape made of rubber or the like as shown in FIGS. 5 and 6, and has a slit 15 at the lower end. The slit 15 automatically opens when the inside of the casing 1 receives a positive pressure due to the intake pulsation pressure or a vibration.

 The operation of the configuration of this embodiment will be described.

When the internal combustion engine is operated, the air passage (not shown) has a negative pressure, and the air in the air cleaner casing 1 is sucked into the intake passage from the outlet 4 connected to this intake passage. Therefore, the inside of the casing 1 has a negative pressure, and the outside air is sucked from the inlet 2.

The outside air introduced from the inlet 2 flows into the swirl flow passage 10 formed between the inner surface of the casing 1 and the outer surface of the filter body 9. In this case, the outside air introduced from the inlet 2 is forcibly swirled in the swirling flow passage 10 by the inlet 2 and the guide plate 3 which are tangentially connected to the casing 1. Therefore, the dust component mixed in the outside air receives the centrifugal force, and along the inner surface of the casing 1,
It flows in a swirling flow. Since the dust discharge hole 11 is formed on the downstream side of the swirl flow of the casing 1, the dust swirled along the inner surface of the casing 1 flows into the dust discharge hole 11 by the inertial force. Therefore, the dust is separated and discharged by the dust discharge hole 11, and the air separated from the dust continues to swirl, but passes through the filter body 9 due to the negative pressure in the intake passage and is sucked out from the outlet 4 to the intake passage. It goes without saying that the air is purified as it passes through the filter body 9.

The dust that has flowed into the dust discharge hole 11 further flows to the tip of the dust guide tube 13 of the dust collector 12 due to inertial force, and is temporarily retained in the dust discharge valve 14. Then, when the inside of the casing 1 receives a positive pressure due to the intake pulsation pressure or receives vibration, the slit 15 of the dust exhaust valve 14 automatically opens, whereby the dust accumulated in the dust exhaust valve 14 It is discharged to the outside.

According to the above-described embodiment, the dust component mixed in the outside air introduced from the inlet 2 is forcibly swirled in the swirl flow passage 10 and is separated by the centrifugal force. Flows along the inner surface of the. Casing 1
Since the dust discharge hole 11 is opened on the downstream side of the swirl flow, the dust swirled along the inner surface of the casing 1 flows into the dust discharge hole 11 as it is due to inertial force. That is, the dust flows into the dust discharge hole 11 due to the inertia of the swirling flow without waiting for the drop due to its own weight, and therefore the separability from the air becomes excellent.

Therefore, the air guided to the outlet 4 through the filter body 9 becomes purified air with less dust components.

In this case, since the dust discharge hole 11 is opened in a slender shape along substantially the entire axial direction of the casing 1,
The dust flowing in the circumferential direction along the inner surface of the casing 1 is satisfactorily introduced without giving inflow resistance. Moreover, since the dust discharge hole 11 has an elongated shape, the casing 1
It does not significantly increase the diameter of.

In addition, the dust introduced into the dust guide tube 13 through the dust discharge hole 11 is the dust discharge valve 14 attached to the tapered tip.
It is temporarily stored in and is discharged when the slit 15 is opened. Since the dust valve 14 has a check valve structure for preventing air from entering from the outside, there is no concern that dust temporarily stored and blown back into the casing 1 through the dust guide tube 13.

Then, since the dust that has entered through the dust discharge hole 11 is guided to the dust discharge valve 14 by the swiveling inertia, in the case of the conventional gravity drop method, the dust discharge valve had to be located below the lower surface of the casing. Compared to the point, the dust valve 14 can be installed higher than the lower surface of the casing,
Ingress of water is prevented.

FIG. 7 is a characteristic diagram showing the cyclone efficiency of the conventional product of the self-weight drop type and the product of the present invention of the rotary inertia separation type. The product of the present invention is recognized to have a capacity improvement of about 50% compared to the conventional product. .

The present invention is not limited to the above embodiment, and the shape of the dust guide tube may be a tapered shape 80 as shown in FIG. 8 or a non-tapered shape as shown in FIG. The shape may be 90.

〔The invention's effect〕

As described above, according to the present invention, the dust contained in the air is separated by the centrifugal force in the process in which the air introduced through the inlet is swirled in the swirling flow passage between the casing and the filter body, and this separation is performed. Due to the inertia of the swirling flow, the generated dust is discharged from the dust discharge hole to the dust collector through the dust guide tube. Since the dust discharge hole is opened in the casing, the dust swirling along the inner surface of the casing can be effectively guided, and the efficiency of discharging the separated dust is improved. Moreover, a special guide plate or the like for forcibly discharging the separated dust is unnecessary, and the structure is simple.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a cross sectional view, FIG. 2 is a side view showing a partial vertical cross section, and FIG.
Fig. 4 is a perspective view of the main part, Fig. 4 is a view in the direction of arrow IV in Fig. 3, Figs. , Figures 8 and 9
Each of the drawings is a perspective view showing another embodiment of the present invention. 1 ... Casing, 2 ... Inlet, 3 ... Guide plate,
4 ... Outlet, 9 ... Filter body, 10 ... Swirling flow passage, 11 ... Dust discharge hole, 12 ... Dust extractor, 13 ... Dust guide tube, 14 ... Dust valve.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A cylindrical casing is provided with a cylindrical filter body by forming a swirling flow passage between the casing and an inner surface of the casing, and the casing is provided with an inlet extending in a tangential direction. Is provided with an outlet communicating with the center of the air, and the air introduced through the inlet is swirled in a swirling flow passage between the casing and the filter body, and the swirling flow separates dust contained in the air by centrifugal force. In the air cleaner in which the air from which the dust has been separated passes through the filter body and is sent out from the outlet, a dust discharge hole is formed in the casing on the downstream side of the swirl flow with respect to the inlet, and the dust is discharged. The exhaust hole is elongated along the axial direction of the casing, and the dust exhaust hole is tangential to the dust guide tube of the dust collector. An air cleaner that is connected with a heater.