Suction and exhaust device

Abstract

An air supply and exhaust device, which uses the air blowing outlet 3 on the lower side of the circumferential opening to introduce the air above the predetermined air supply space from the air supply pipe 5 with a predetermined air supply pressure as an air curtain flow outside the predetermined local area. Blow out, and suck the air in the above-mentioned predetermined local area surrounded by the air curtain flow through the air suction port 2a inside the air blowing port 3, and discharge it to the upper part of the air suction pipe 2, and the air suction pipe 2 runs through the air blowing direction The central part of the reverse air supply space extends to the outside. The above-mentioned air blowing space is divided by the partition plate 41 into upper and lower first air blowing spaces 4c where the air from the air blowing pipe 5 is introduced and a second air blowing space 4d that expands in the direction of the air blowing port 3. The first and second air blowing spaces 4c, 4d are communicated with each other through annular rectifying passages 40R, 50R with small passage diameters extending vertically around the outer periphery of the suction pipe 2 . Therefore, the velocity distribution of the airflow blown out from the air outlet is made uniform, and a stable air curtain flow can be formed.

Description

technical field [0001] The present invention relates to an air supply and exhaust device that forms an air curtain flow (air curtain) surrounding the outer periphery of a predetermined local area, and sucks air in the local area in the air curtain flow against it to exhaust air. Background technique [0002] For example, as a ventilation device for ventilating a predetermined local area, on the one hand, it sends air curtain-like air around the outer periphery of the local area, and on the other hand, it sucks the air in the above-mentioned local area in the air curtain flow and discharges it. . The inventors of the present invention will file an application for the above-mentioned ventilator. [0003] For example, Figure 13 One example is shown. [0004] exist Figure 13 Among them, firstly, the symbol 4 is a generally conical external air supply chamber arranged on the upper part of the above-mentioned local area, and a predetermined interval is left below the inner sid...

AI Technical Summary

Problems solved by technology

[0018] That is, in Figure 13 In the structure of the air supply and exhaust device shown, since the outside air is introduced into the wider blowing air rotation space in the above-mentioned outside air blowing chamber 4 through an air supply pipe 5, the dynamic pressure of the introduced air flow is difficult to disperse. , there is a difference in achieving uniform rectification effect on all the rectification surfaces of the above-mentioned rectification plate 6. The part with high dynamic pressure passes through the rectification plate 6 early, while the part with low dynamic pressure passes through slowly.

Therefore, a swirling flow with a uniform flow velocity distribution cannot be generated, and part of the blown flow is chaotic, making it difficult to form a reliable air curtain flow.

[0019] Different from the above-mentioned problems, in general air supply and exhaust devices, the swirling flow generating guide vanes 30a, 30a, ... cannot swirl and blow out the air from the above-mentioned air blowing port 3 to form an air curtain flow, and this problem becomes more significant. question

Images