JPH0375433A - Zone forming device - Google Patents

Abstract

PURPOSE:To reduce the cost and simplify handling and erection work by a method wherein a thin film stream radially flows outward from the whole circumference of a guide member, and a zone surrounded by the stream is formed within a space on the face side of the guide member. CONSTITUTION:When a spouting stream generating device 2 operates, a spouting stream A impinges upon the center of an umbrella-like guide inner plans 1a of a guide member 1 and distributed along the guide plane 1a to form a stream B. The stream B flows toward the circumference 1c, turns into a thin film stream C from the circumference 1c, and flows slightly downward, that is, it radially flows toward the space on the face side of the guide member 1. The annular spouting stream C increases in diameter as it flows forth, then reduces in diameter gradually and converges into a stream F. A local closed space surrounded by the stream C. i.e., a zone 3, is formed within a space 4, and recirculating streams D are generated inside the zone 3. The pressure in the zone 3 surrounded by the stream C is lower than that in the space 4 because the stream C has an entrainment. Thereby, the cost is reduced and erection work is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a zone forming device suitable for forming a zone surrounded by an air current in the atmosphere.

(Prior art) The radioactive dust removal device shown in FIG.
It is known from the publication No. 11700.

In this radioactive dust removal device, the air purified by the processing device 01 is energized by blowing mO2, and the air is energized through the double duct 03.
The air is supplied to the center of the umbrella-shaped hood 07 through a limited passage 06 between the outer tube 04 and the inner tube 05, and is diffused radially in the process of passing through the internal flow path 013 to absorb the air at the outer periphery. The air is blown downward from the air outlet 08 as an air curtain 09. A local work space 011 surrounded by this air curtain 09 is formed within the chamber 10, and the work space 0
Contaminated air in 11 is sucked into inner pipe 05 through air intake port 012 that opens downward at the center lower surface of umbrella-shaped hood 07 and is transferred to processing device 01, where it is converted into contaminated solids and purified air. Separated.

(Problems to be Solved by the Invention) In the conventional device described above, air is blown downward in the form of a film from the air outlet 08 on the outer periphery of the umbrella-shaped hood 07; Since the amount of air drawn in from the air intake port 012 is equal to the amount of contaminated air sucked in from the air intake port 012, a short-circuit flow is likely to occur between the outlet air flow and the intake air flow. Not only is it difficult to form, but in order to enlarge this local working space 011, an umbrella-shaped hood 0 is required.
7 must be made large, or the flow velocity of the film-like air flow blown out from the air outlet 8 must be extremely increased.

Furthermore, since the structure of the umbrella-shaped hood 07 is complicated and the double duct 03 has to be used, there are problems such as not only increased cost but also troublesome handling and installation work.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and the gist thereof is to provide a jet flow generating means for generating a jet of fluid, and a jet flow generated from the jet flow generating means. a guide member having an umbrella-shaped guide surface for diffusing and adhering the jet flow from the center toward the outer periphery; The zone forming device is characterized in that a zone surrounded by a film-like fluid flow flowing out in a direction is formed in a space on the ventral side of the guide member.

A wall surface can be disposed on the ventral side of the guide member and directly facing the guide member with a predetermined distance therebetween.

The jet generating means can be arranged on the ventral side or the dorsal side of the guide member.

The guide member can be provided with a cover plate that covers the umbrella-shaped guide surface.

A diffuser plate can be disposed to directly face the jet flow discharged from the jet flow generation means, and its peripheral edge can be opposed to the umbrella-shaped guide surface of the guide member with a gap therebetween.

The jet flow generating means can be equipped with a centrifugal impeller.

The umbrella-shaped guide surface of the guide member can be a rotating surface about the central axis of the guide member.

(Function) The [1Φ jet jet discharged from the jet generating means spreads from the center toward the outer periphery while adhering to the umbrella-shaped guide surface of the guide member, and spreads from the entire circumference of the outer periphery to the ventral side of the guide member, Moreover, it flows out in the form of a film in the radial direction. This membranous fluid stream attracts each other to form a zone surrounded by this fluid stream in the space on the ventral side of the guide member.

(Example) A first embodiment of the invention is shown in FIG.

In FIG. 1, ``■'' is an umbrella-shaped guide member, and 2 is a jet generating means for generating a jet of fluid, which is disposed on the back side of the guide member 1. This jet flow generating means 2 is a cylindrical casing 2
1, an impeller 22 disposed coaxially therewithin, a motor 23 for driving the impeller 22, and a stay 24 for fixing the motor 22 to the casing 21. The guide member 1 and the jet generating means 2 are supported in the space 4 by appropriate means such as hanging from the ceiling or supported by a support.

When the jet generating means 2 is operated, the jet A discharged from the jet collides with the central part of the umbrella-shaped guide surface 1a on the back side of the guide member 1 and diffuses into the flow B attached to the guide surface 1a. It flows toward the outer peripheral edge 1C, becomes a thin film-like annular jet C from the outer peripheral edge 1c, and flows diagonally downward, that is, the guide member l.
It flows out toward the ventral side and in the radial direction. and,
This annular jet C expands its diameter as it advances, then decreases its diameter, and merges again to form a flow E, so that a locally closed space surrounded by this jet C, that is, a zone 3 becomes a space 4.
A recirculation flow D occurs within zone 3.

That is, since the annular jet C has the property of attracting and dragging the surrounding air, that is, has entrainment, the pressure in the zone 3 surrounded by the jet C becomes smaller than the pressure in the space 4. Thus, the jets C attract each other, the streamlines of the jets C are bent, and the streamlines of the jets C are determined so that this negative pressure and the centrifugal force acting on the jets N/JLC are balanced.

FIG. 2 shows a second embodiment of the present invention, in which a wall surface 5 such as a floor or the ground is disposed on the ventral side of the guide member 1 so as to face it directly at a predetermined distance, A zone 3 is formed between this wall surface 5 and the guide member 1. The other configurations are the same as in the first embodiment.

The annular jet C collides with the wall surface 5 and splits into a flow F that diffuses outward along the wall surface 5 and a flow G that enters inward toward the zone 3. Flow G entering this zone 3
This reduces the negative pressure in zone 3 and thus the size of zone 3 becomes larger than without wall 5.

FIG. 3 shows a third embodiment of the present invention, which differs from the first and second embodiments in that the jet generating means 2 is disposed on the ventral side of the guide member l. However, the other configurations are the same.

In this third embodiment, the jet A discharged from the jet generating means 2 collides with the central portion of the umbrella-shaped guide surface 1b on the ventral side of the guide member 1 and flows along this guide surface 1b. Since the jet generating means 2 sucks air from within the zone 3, the negative pressure within the zone 3 is larger than that of the first and second embodiments, and therefore the size of the zone 3 is larger than that of the first and second embodiments. 2
It is smaller than the embodiment.

FIG. 4 shows a fourth embodiment of the present invention, in which a cover plate 11 is provided above the umbrella-shaped guide surface 1a on the back side of the guide member l with a slight gap therebetween. The inner circumferential edge of the covering plate 11 is connected to the outlet end of the casing 21 of the jet flow generating means 2.

In this fourth embodiment, since the flow B along the umbrella-shaped guide surface 1a is not affected by external disturbances, such as air fluctuations in the space 4, the film-like jet flow C flowing out from the outer peripheral edge 1c is The thickness can be made uniform and therefore zone 3
completely cut off from Space 4.

FIG. 5 shows a fifth embodiment of the present invention, in which a diffuser plate 6 is disposed so as to directly face the jet stream A discharged from the jet stream generating means 1, and the peripheral edge of the diffuser plate 6 is It is opposed to the umbrella-shaped guide surface 1b on the ventral side of the guide member 1 with a slight gap therebetween. The inner peripheral edge of the guide member 1 is connected to the outlet end of the casing 21 of the jet flow generating means 2.

In this fifth embodiment, the jet A discharged from the jet generating means 2 collides with the diffusion plate 6, diffuses, is guided by the diffusion plate 6, and travels along the umbrella-shaped guide surface 1b on the ventral side of the guide member 1. It becomes a flow.

This fifth embodiment is less affected by external disturbances, and since the jet generating means 2 sucks air from the space 4, the size of the zone 3 does not become smaller.

FIG. 6 shows a sixth embodiment of the present invention, in which the jet generating means 2 is disposed on the ventral side of the guide member 1, and
The fifth point is that the airflow flows along the umbrella-shaped guide surface 1a on the dorsal side of the
This embodiment is different from the embodiment of , but is similar in other respects.

A seventh embodiment of the present invention is shown in FIG. 7, in which the jet generating means 2 includes a centrifugal impeller 9 driven by a motor 8. In FIG.

In this seventh embodiment, the airflow flowing out from the centrifugal impeller 9 flows along the umbrella-shaped guide surface 1a on the back side of the guide member 1.

FIG. 8 shows an eighth embodiment of the present invention, in which the umbrella-shaped guide surface 1a on the back side of the guide member 1 is a conical surface. The shape of the guide surface affects the diameter of zone 3 and the position of the confluence of jets C, but it may be a conical surface, spherical surface, hyperboloid surface, etc. as long as it is a rotating surface around the central axis of the guide member 1. .

The case where a zone surrounded by air currents is formed in the atmosphere has been explained above, but it is of course possible to form a zone in any fluid such as gas or liquid, not just air, by a jet of this fluid. be.

(Effects of the Invention) In the present invention, the jet flow discharged from the jet flow generating means is spread from the center toward the outer periphery of the guide member while being attached to the umbrella-shaped guide surface of the guide member, and from the outer periphery of the guide member. Because a zone surrounded by a film-like fluid flow flowing ventrally and in the radial direction is formed in the space on the ventral side of the guide member, it Large diameter zones can be easily formed.

By arranging a wall surface directly facing the guide member at a predetermined distance on the ventral side thereof, a large diameter zone can be formed between the guide member and the wall surface.

The jet generating means can be disposed on the dorsal side or the ventral side of the guide member, and when disposed on the ventral side, the diameter of the zone can be made larger than when disposed on the dorsal side.

Further, by providing a covering plate that covers the umbrella-shaped guide surface, the thickness of the film-like fluid flow flowing out from the outer peripheral edge of the guide member can be equalized, and therefore, the zone can be reliably shielded from the space.

If a diffusion plate is disposed to directly face the jet stream discharged from the jet generation means, and its peripheral edge faces the umbrella-shaped guide surface of the guide member with a gap in between, this diffusion plate can direct the fluid to the umbrella-shaped guide surface of the guide member. It can be placed along the surface.

[Brief explanation of drawings]

1 to 8 are cross-sectional views showing embodiments of the present invention, respectively. FIG. 9 is a partially cutaway side view of an example of a conventional device. Guide member--1, umbrella-shaped guide surface-la, lb, outer peripheral edge-
4c-. Jet flow generating means-2, film-like fluid flow-C, zone-1st
figure

Claims (8)

[Claims] (1) comprising a jet generating means for generating a jet of fluid, and a guide member having an umbrella-shaped guide surface for diffusing and adhering the jet discharged from the jet generating means and guiding it from the center toward the outer periphery; A zone surrounded by a film-like fluid flow flowing out from the entire circumference of the outer peripheral edge of the guide member toward the ventral side of the guide member and in the radial direction is formed in the space on the ventral side of the guide member. A zone forming device characterized by: (2) A wall surface directly facing the guide member is provided on the ventral side thereof at a predetermined distance from the guide member, and a zone is formed between the guide member and the wall surface. zone forming device. (3) The zone forming device according to claim (1) or (2), wherein the jet flow generating means is arranged on the back side of the guide member. (4) The zone forming device according to claim (1) or (2), wherein the jet generating means is disposed on the ventral side of the guide member. (5) The zone forming device according to any one of claims (1) to (4), wherein the guide member is provided with a cover plate that covers the umbrella-shaped guide surface. (6) Claim (1) characterized in that a diffuser plate is disposed to directly face the jet stream discharged from the jet stream generation means, and its peripheral portion faces the umbrella-shaped guide surface of the guide member with a gap therebetween. The zone forming device according to (4). (7) The zone forming device according to any one of claims (1) to (6), wherein the jet flow generating means includes a centrifugal impeller. (8) Claims (1) to (1) characterized in that the umbrella-shaped guide surface of the guide member is a rotating surface around the central axis of the guide member.
7) Zone forming device as described.