JPS60149836A - Ventilating fan with dust removing device - Google Patents

Abstract

PURPOSE:To improve dust removing efficiency by a method wherein an air flow is generated by an axial-flow blower, dust is separated by centrifugal force, then the cleaned discharging air is discharged to a discharging pipe by utilizing central negative pressure. CONSTITUTION:At the operation of an axial-flow blower 1, the air contained indoor dust is introduced into a turning flow generating cylinder 2 from the axial- flow blower 1. Then the turning air flow is generated after passed through the inclined roof 13 fixed in an annular space 12, the dust is moved upward by the centrifugal force along the inner wall of the turning flow generating cylinder 2 and a guide cylinder 14. The dust passed through the guide cylinder 14, drawn into an annular groove caused by the negative pressure in an annular groove 15, turned in a turning air flow introducing pipe 16, then drawn into a duct 4, further, introduced into a dust separating cylinder 3. The air separated from the dust after passed through the guide cylinder 14 is discharged toward the outside through a discharging pipe 17. A duct 5 is opened upward at the center of the discharging pipe 17, the air separated from the dust is flowed arround the discharging pipe 17, accordingly, the central negative pressure is acted in the duct 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a ventilation fan that is mounted on the roof of a factory or the like.

A variety of mineral, vegetable, and animal dust is generated inside factories and other buildings, and these are removed by dust collectors installed inside the buildings, but complete dust removal is difficult. Some of it is released outside by ventilation fans installed in the building, causing pollution in the neighborhood.

The present invention is a ventilation fan equipped with a dust removing device that is designed to prevent such pollution and is used by being attached to the roof or wall of a building.

The configuration is explained using a drawing: an axial flow blower (1), a swirling flow generating tube (2) installed above the blower, and a dust duster connected to the swirling flow generating tube through ducts (4) and (5). It consists of a separation tube (3). The swirling flow generating cylinder (2) is formed to have a larger diameter in the middle, and a hollow cylinder (11) with a closed conical bottom is provided concentrically at the bottom of the cylinder to form an annular space (12). ) is formed. This annular space* has a plurality of inclined blades (13) arranged radially. Above the inclined blades, there is a guide cylinder (14) whose diameter decreases as it goes toward the base. It is attached to the inner wall of the swirl flow generating tube (2) to form an annular groove (15) between the swirl flow generating tube (2) and the swirl flow generating tube (2) is attached to the outer circumference of the annular groove. The swirling air guide pipe (16) is cut out and communicated with the annular groove (15).
) is provided. In addition, the swirling flow generating cylinder (2) G has an exhaust pipe (with a diameter smaller than that of the swirling flow generating cylinder) (
A downward annular groove (18) is formed by protruding the groove (17). The dust separation tube (3) consists of a swirling introduction part (19) connected to the swirling wind guide pipe (16) by a duct (4), a lower dust part (20), and an air bleed pipe (21). 21
) is drawn downward from the lower edge of the turning introduction part (19),
The upper part thereof is connected to a duct (5). Duct (5
) is drawn into the center of the exhaust pipe (17) above the swirl flow generating node (2) and opens upward. Note that (22) is a cover attached to the device of the present invention.

Next, the usage mode of the ventilation fan with a dust removal device of the present invention will be explained. FIG. 1 is a longitudinal cross-sectional view of a ventilation fan with a dust removal device according to the present invention, and FIG. 2 is a cross-sectional view of FIG. 1 taken along line A-A.

When the axial blower (1) attached to the roof (not shown) is operated, the air containing dust inside the building is sent from the axial blower (1) to the swirling flow generator tube (2). When the dust passes through the sloped roof (13) attached to the annular space (12), it becomes a swirling airflow, and the dust is generated by centrifugal force.
It rises along the mf21 and the inner wall of the guide tube (14).

The dust that has passed through the guide tube (14) is drawn into the annular groove (15), which has a negative pressure as described later, and further enters the swirling wind guide tube (16) where it swirls. It is drawn into the duct (4) and enters the dust separation tube (3). The air that has passed through the guide 'Wl (14) and from which dust has been removed is
It is discharged to the outside through the exhaust pipe (17). Exhaust pipe (1
The lower end of 7) protrudes into the swirling flow generating cylinder (2) and forms a downward annular groove (18), so that the guide cylinder (14)
The rising dust is prevented from entering the exhaust pipe (17) and falls into the annular groove (15), where it swirls along the inner wall of the swirling flow generating cylinder (2). pipe (16
).

The dust drawn into the swirl introduction part (19) of the dust separation cylinder (3) loses its swirling force while swirling and falls into the dust part (20). The air from which dust has been separated during dust separation (3) is drawn into the bleed pipe (21), and then passed through the duct (5).
) into the exhaust pipe (17).

The duct (5) opens upward at the center of the exhaust pipe (17), and as mentioned above, the dust-removed air flows through the exhaust pipe (17).
), a central negative pressure will work inside the duct (5). Therefore, the bleed pipe (21), the duct (4), and the swirling air guide pipe (16) communicate with the duct (5).
Then, negative pressure acts on the annular groove (15), and dust is drawn into the annular groove (15) more efficiently.

As shown in Figure 2, the swirling wind guide 'iR' (16) is
From this point, the annular groove (15) is gradually enlarged so that its cross-sectional area becomes maximum at the connection part with the duct 4).
Dust is drawn in efficiently.

Further, the turning introduction part (19) is configured such that its cross section is the largest at the connecting part with the duct l-+41, and its cross section becomes smaller as it goes in the turning direction.

A removable bottom may be attached to the lower part of the dust part (20), but since removing dust on the roof or at a high altitude is dangerous, a flexible hose ( (not shown) and pull it into the building.
If the lower end is closed, the dust will fall into the flexible hose and can be easily removed.

As described above, the ventilation fan with a dust removal device of the present invention generates airflow using an axial blower, separates dust by centrifugal force, and discharges purified exhaust gas to the exhaust pipe using the central load. Since dust is efficiently guided to the dust separation chamber, it has the characteristic of extremely high dust removal efficiency.

In addition, since the only driving part is the motor of the axial blower and there are no other parts to drive, there is no need for maintenance other than removing accumulated dust, and there is no need to use water like a shower set. Therefore, there is no need to worry about rust, the service life is long, and there are no running costs.

In addition, since the structure is simple and compact, it does not take up much space, and although it is inexpensive, it has high dust removal efficiency and is extremely useful in terms of pollution prevention and economically.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a ventilation fan with a dust removal device according to the present invention, and FIG. 2 is a cross-sectional view taken along line A'-A in FIG. 1. 1; Axial blower, 2. Swirling flow generating cylinder, 3; Dust separation cylinder, 4, 5; Duct, 11; Inner cylinder, 13; Slanted vane, 14; Guide cylinder, 16; Swivel wind guide pipe, 17; Exhaust
Pipe, 19; Swivel introduction part, 20, Dust collection, 21;
Qi '13' Patent Applicant NT Gi Co., Ltd. 01 Ear chart procedure amendment May 22, 1980 To the Commissioner of the Japan Patent Office 2 Title of the invention Ventilation fan with dust removal device 3, Relationship to the person making the amendment Case Patent applicant City Heim Shin-Osaka No. 903 No. 4, date of amendment order April 4, 1980 LI (shipment date April 24, 1982)
5. Subject of correction

Claims (1)

[Claims] It consists of an axial flow blower 11), a swirling flow generating tube (2) attached above it, and a dust separation front connected to the swirling flow generating tube by tallites (4) and (5); ) is formed to have a larger diameter at the middle part, and a hollow inner cylinder (11) with a conical shape at the bottom is provided concentrically to form an annular space (12). A plurality of inclined vanes (13) are attached radially in this annular space; on one side of the inclined vanes, a swirling flow generating cylinder ( 2), and an annular groove (
15), and a swirling air guide pipe (16) is provided on the outer periphery of this annular groove by cutting out the swirling flow generating tube (2) around the entire circumference and communicating with the annular groove (15). An exhaust pipe (17) with a smaller diameter than the generator cylinder (2) projects to form a downward annular groove (18);
) consists of a swirling introduction part (19) connected to the swirling air guide pipe (16) by a duct (4), a lower dust reservoir (20), and an air bleed pipe (2).
1), the bleed pipe (21) is a swirl introduction part (19)
The duct (5) is drawn downward from the lower edge of the
), and the duct 5) is drawn into the center of the exhaust pipe (17) and opens upward to form a ventilation fan for the dust removal device.