JPH0518575A - Local gas discharger - Google Patents

Abstract

PURPOSE:To efficiently discharge contaminated air without diffusing by disposing a vortex flow-generating guide blade at a suction side of a blower fan. CONSTITUTION:An exhaust hole 14 is provided at a ceiling 13 above a contaminated air generating place 12 near a floor 11. An axial flow blower fan 15 is disposed in the hole 14, and vortex flow-generating guide blades 16 are disposed at the suction side, i.e., the lower side of the fan 15. The blades 16 are twisted at a certain angle to the flow of the air to be sucked to the fan 15, and a thickness of a generated vortex is controlled by regulating the angle. The vortex S is generated immediately at the lower side of the fan 15 by the blades 16 to reach the floor 11. Accordingly, the contaminated air can be efficiently discharged without diffusing, and since the vortex flow is generated, it does not need occupy a space between the ceiling and the floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for exhausting polluted air containing smoke, oil mist, and gas generated by welding work in a factory with a high ceiling.

[0002]

2. Description of the Related Art As an apparatus of this type, as shown in FIG. 4, an exhaust hole (34) is provided in a ceiling (33) above a place (32) where polluted air is generated.
In addition to the one shown in FIG. 4 in which the blower fan (35) is arranged in the exhaust hole (34) and the vertical duct (37) with the lower end canopy hood (36) is contaminated with air, Office (32)
There is known one shown in FIG. 5 which is arranged between the exhaust port and the exhaust hole (34).

[0003]

The problem shown in FIG. 4 is as follows.
By the time the contaminated air reaches the exhaust hole (34), it will diffuse throughout the building. In order to reduce the concentration of polluted air below a certain level, a large amount of air must be exhausted, which requires a great amount of power.

In the structure shown in FIG. 5, the generated contaminated air is sucked into the canopy hood (36) before being diffused and is sent to the exhaust hole (34) through the duct (37), so that the contaminated air is efficiently exhausted. can do. However, if a crane is installed in the building, the duct (37) may interfere with the traveling of the crane.

An object of the present invention is to provide a local exhaust system capable of efficiently exhausting air without occupying a space between a ceiling and a floor and diffusing contaminated air.

[0006]

A local exhaust system according to the present invention is a local exhaust system in which an exhaust hole is provided in a ceiling above where polluted air is generated, and a blower fan is arranged in the exhaust hole. A guide vane for generating a vortex is disposed on the suction side of the.

Further, it is preferable that an auxiliary blower fan for strengthening the generated vortex and a guide blade are arranged between the location where the polluted air is generated and the guide blade.

[0008]

In the local exhaust device according to the present invention, since the vortex generating guide vanes are arranged on the suction side of the blower fan,
A swirl is generated by the guide vanes in the air sucked into the blower fan, and the generated swirl reaches the place where the contaminated air is generated. It is discharged from the hole.

Further, when the auxiliary blast fan for enhancing generated vortex and the guide blade are arranged between the polluted air generating place and the guide blade, the generated vortex is reinforced by the auxiliary blow fan and the guide blade.

[0010]

Embodiments of the present invention will be described below with reference to FIGS.

Referring to FIG. 1, an exhaust hole (14) is provided in a ceiling (13) above a location (12) where polluted air is generated near the floor (11). An axial blower fan (15) is arranged in the exhaust hole (14). On the suction side of the blower fan (15), that is, on the lower side, a vortex flow generation guide blade (16) is arranged. Guide vane (16)
Is twisted at a certain angle with respect to the flow of wind sucked into the fan (15), and the thickness of the vortex generated by adjusting the angle is controlled.

A swirl (S) is generated just below the fan (15) by the guide vanes (16). The generated vortex (S) is on the floor (1
Although it reaches 1), this is due to Helmholtz's law that the strength of the vortex (S) (cut area of vortex system × vorticity) is universal depending on place and time.

The polluted air generated near the floor (11) is caught in the generated vortex (S) and does not diffuse, so that the exhaust hole (1)
4) It is immediately guided until it is discharged through the exhaust hole (14). Referring to FIG. 2, as in FIG. 1, an exhaust hole (14) is provided in the ceiling (13) above the location (12) near the floor (11) where polluted air is generated, and the exhaust hole (14) is provided in the exhaust hole (14). The fan (15) is arranged, the guide vanes (16) are arranged under the fan (15), and in addition to this, between the polluted air generation place (12) and the guide vanes (16), An auxiliary blower fan (21) for strengthening the generated vortex and a guide blade (22) are arranged. An auxiliary guide vane (22) is provided on each of the suction side and the discharge side of the auxiliary blower fan (21).

When the ceiling (13) is relatively high, the center of the generated vortex (S) may be displaced from the polluted air generation point (12), but it is lower than the ceiling and the polluted air generation point (12). If there is the auxiliary blower fan (21) and the guide blades (22) near the position (), the deviation can be prevented.

Referring to FIG. 3, the auxiliary blower fan (2
1) and guide vanes (22) have multiple contaminated air generation locations (12)
They are located above each.

As described above, when there are a plurality of auxiliary blower fans (21) and guide blades (22), the respective auxiliary blower fans are provided.
A plurality of vortices (S) are generated by the (21) and the guide vanes (22), and the generated vortices (S) merge into one exhaust hole.
It is sucked into (14). Therefore, it is possible to reliably prevent and supplement the diffusion of the contaminated air in a relatively wide range.

[0017]

According to the present invention, a swirl flow is generated by the guide vanes in the air sucked by the blower fan, and the generated swirl reaches the place where the contaminated air is generated. Therefore, the contaminated air is entrained in the swirl. Since it is discharged from the exhaust hole together with the air sucked into the blower fan, the contaminated air can be efficiently discharged without diffusing, and it is necessary to occupy the space between the ceiling and the floor in order to generate swirl. Absent.

Further, when the generated vortex is strengthened by the auxiliary blower fan and the guide vanes, the contaminated air can be exhausted more efficiently.

[Brief description of drawings]

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

FIG. 2 is a layout diagram showing another embodiment of the present invention.

FIG. 3 is a layout configuration diagram showing still another embodiment of the present invention.

FIG. 4 is a layout configuration diagram showing a conventional example.

FIG. 5 is an arrangement configuration diagram showing another conventional example.

[Explanation of symbols]

12 Locations where polluted air is generated 13 ceiling 14 Exhaust hole 15 fans 16 guide vanes 21 Auxiliary fan 22 Auxiliary guide blade

Claims (2)

[Claims] 1. An exhaust hole (14) is provided in a ceiling (13) above a polluted air generation place (12), and a blower fan (15) is provided in the exhaust hole (14).
The local exhaust system in which the vortex generating guide vanes (16) are disposed on the suction side of the blower fan (15). 2. The auxiliary blower fan (21) and the guide vane (22) for enhancing the generated vortex flow are arranged between the polluted air generating place (12) and the guide vane (16). Local exhaust ventilation.