JPH02157549A - Artificial whirlwind type hood and its utilization method - Google Patents

Abstract

PURPOSE:To reduce a size of an air discharging hood, reduce a pressure loss and eliminate an air blowing pipe and an air blowing air blower by a method wherein air is sucked from a suction port arranged at an axial direction of a tornado-like wall formed to be in continuous with a circumferential edge of a plate-like wall with the wall surface being gradually directed toward a center part and an artificial tornado is axially generated at a central axis with air sucked from the air suction port. CONSTITUTION:As an air blower arranged at a downstream side of a suction pipe 7 is operated, contaminated air D is sucked from an air suction port 4 of an artificial tornado hood 1. The contaminated air D is flowed along an inner wall surface gradually directed toward a center of a tornado-like wall 3 in continuity with the plate-like wall 2, resulting in that the air becomes whirling air. The whirling air is sucked by a suction port 5 arranged in a terminal box 6, so that a circular negative pressure core E is formed within the circulating air stream. A circular artificial tornado H is formed under a formation of the negative pressure core E. The contaminated air D is not leaked from the contaminated air generating source due to this artificial whirlwind H and then the air is rapidly discharged out of the system by the suction pipe 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an artificial tornado type hood and its usage.

[Prior Art] As shown in Fig. 11, a conventional exhaust hood a is installed above a source where toxic gases, dust, etc. (hereinafter simply referred to as contaminated air) are generated. , an air suction port d is provided at the bottom of a cone-shaped hood body C, and an air suction port e is provided at the top of the hood body C. The exhaust hood a removes contaminated air from the source by suctioning air with a blower (not shown) installed downstream of the suction pipe f connected to the suction port e. is sucked in through the air suction port d and expelled to the outside through the suction port e.

When sucking in this contaminated air, the suction wind speed distribution at the air suction port d is fast at the center of the air suction port d and slow at the periphery, as shown by the curve y in Figure 12. However, if the suction wind speed around the air suction port d is slower than the required control wind speed V, the arrow in Figure 11 will appear. As in 1iiH, contaminated air generated from the source leaks from the exhaust hood a.

Therefore, in the conventional exhaust hood a, it is necessary to provide the required controlled wind speed V to prevent contaminated air from leaking and to be sucked in from the air suction port d. It will be suctioned,
Furthermore, in order to minimize the amount of air sucked in, the 11 dimension of the hood body C is increased.

In addition, as a method of increasing the suction wind speed around the air suction port d using the conventional exhaust hood a, that is, as a method of reducing the suction air volume by ensuring the above-mentioned required control wind speed V, there is a method as shown in Fig. 13. , there is a baffle plate G in the center of the hood body C.
There is also a method of arranging an exhaust hood a° to reduce the suction air volume while ensuring the required control wind speed V.

In addition, as shown in Fig. 14, a conventionally known artificial tornado type hood a" (see Japanese Patent Application Laid-Open No. 112, No. 112, No. 60-96846)
The artificial tornado type hood a" causes an artificial tornado H in the hood body C by blowing out air using the blowing air vibe h, and the artificial tornado 11 sucks contaminated air from the air suction port d. Therefore, this artificial tornado type hood a" The required control wind speed V at the suction port d becomes average, and there is no need to increase the suction wind speed more than necessary in order to obtain the required control wind speed V in the surrounding area, as in the conventional exhaust hood a. Problem to be Solved by the Invention 1 However, in the exhaust hood a shown in FIGS. 11 and 12 as described above, in order to secure the required control wind speed V,
It is necessary to suck in an extra amount of air in the shaded area in FIG. For this reason, exhaust gas treatment devices such as blowers and dust collectors are all thick (which increases both the manufacturing cost and running cost of the device. Also, the shape of the exhaust hood a is also large.
As shown in Fig. 2, the dimension 8 becomes larger, and if this exhaust hood a is installed indoors, there will be greater restrictions on the ceiling height.

Furthermore, in the exhaust hood a° shown in FIG. 13, a large baffle plate g is placed in the center of the hood body C, resulting in a large pressure loss and the need for a blower with a large suction pressure. Both manufacturing costs and running costs will be high.

Furthermore, in the artificial tornado type hood a'' shown in Fig. 14, air is blown out from the blow-off air vibe h to cause an artificial tornado H inside the hood body C, so a blow-off air vibe is required, and a blower for blowing out the air is also required. In addition, since it is necessary to discharge the amount of air blown out from the blow-off air vibrator h, the size of the exhaust gas treatment equipment such as the suction blower and dust collector increases accordingly, and the manufacturing cost and running cost of the equipment also increase. It gets expensive.

Therefore, 1. the present invention was made in view of the above circumstances, and the 8 dimensions of the exhaust hood are small, the pressure loss is small, and neither a blowing air vibrator nor a blower for blowing out air is required, and a blower for suction and a dust collector are not required. The purpose of the present invention is to provide an artificial tornado type hood that can be made smaller together with a wandering gas treatment device such as the above.

[Means for Solving the Problems 1] In order to solve the above problems, the artificial tornado type hood of the present invention includes a plate-shaped wall for receiving air to be exhausted, and a wall surface extending from the periphery of the plate-shaped wall at the center. With a spiral wall formed to gradually move towards.

The spiral wall includes a suction port located in the axial direction of the central portion of the spiral wall, and an air suction port formed by the tip of the spiral wall, and air is sucked from the suction port. The air sucked in from the air suction port gradually flows along the wall surface toward the center of the spiral wall to form a swirling airflow, thereby generating an artificial tornado in the axial direction of the center. It is. This artificial tornado type hood is
It may be arranged on the side or above a source where toxic gas, dust, etc. are generated to suck and exhaust the toxic gas, dust, etc. generated from the source.

[Function 1] According to the above configuration, when air is sucked from the suction port, the air enters from the air suction port, hits the plate-like wall, and flows along the spiral wall formed with the wall surface facing the center. A swirling airflow is formed, and a negative pressure area is formed in the center of the swirling airflow by suction of air from the suction port, but this negative pressure area partially covers the negative pressure core along the center of the swirling airflow. The centrifugal force of these swirling airflows and the centripetal force of a part of the negative pressure core balance, creating a continuous artificial tornado toward the suction port. Obtain the suction wind speed and the contaminated air will be quickly removed.

In addition, an artificial tornado-style hood is placed on the side or above the source of toxic gases, dust, etc., so when air is sucked in from the suction port, a continuous artificial tornado is created towards the suction port. This makes it possible to quickly remove toxic gases, dust, etc. by obtaining a uniform maximum suction wind speed over the entire peripheral edge of the air suction port.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 1 to 10.

FIG. 1 is a plan view of the artificial tornado type hood of the present invention, and FIG. 2 is a sectional view taken along the line II--II in FIG. 1. In both figures, l indicates an artificial tornado type hood, and the artificial tornado type hood l is a one-circular shaped hood for sucking up and exhausting contaminated air from sources that generate harmful gases, dust, etc. A plate-shaped wall 2, a spiral wall 3 connected to the plate-shaped wall 2, an air suction port 4 formed by the peripheral edge of the tip of the spiral wall 3, and a central axis of the spiral wall 3. It consists of a terminal box 6 having a suction port 5 located in the direction, and a suction vibrator 7 connected to the terminal box 6.

The plate-like wall 2 is for receiving contaminated air entering from the air suction port 4, and has a circular shape and is approximately flat.
Fg is made. The spiral wall 3 is continuous to the periphery of the plate-like wall 2.

The spiral wall 3 is formed so that its wall surface is gradually directed toward the center, and the contaminated air flowing from the air suction port 4 flows along the inner wall surface gradually toward the center, causing the swirling. Air current is easily generated. These spiral walls 3 and the plate-shaped wall 2 form a space 8 having a substantially spiral cross section. This space 8 is created by operating an air blower i (not shown) on the downstream side of the suction port 5.
It is formed to have enough space to hold the swirling airflow when contaminated air enters from the circular air suction port 4 and flows along the inner wall surface of the spiral wall 3. has been done.

The terminal box 6 has a side wall 9 inside the spiral wall 3.
9, 1O and a bottom wall 11 extending from the spiral wall 3. The side wall 9.9 of this terminal box 6 is provided with the suction port 5. The axial direction of the suction port 5 substantially coincides with the axial direction of the center of the spiral wall 3. Further, the suction vibrator 7 is provided on the spiral wall 3 located on the upper surface of the terminal box 6, and a blower (not shown) is connected downstream of the suction vibrator 7.

Next, the state of use of the artificial tornado type hood I having the above structure will be explained.

First, a damper (not shown) provided on the suction vibrator 7
When the blower installed on the downstream side of the suction vibrator 7 is operated at a predetermined opening degree, contaminated air is sucked in from the air suction port 4 of the artificial volume hood 1.
Since the air flows along the inner wall surface gradually toward the center of the spiral wall 3 connected to the plate-like wall 2, it becomes a swirling air current. Since the inside of this swirling airflow is sucked by the suction port 5 provided in the terminal box 6, an annular negative pressure core portion E is formed in each of the swirling airflows. These negative pressure core parts E
As a result, a circular artificial tornado H is created as shown in Figure 1.
is formed. As shown in Figure 3, due to this circular artificial tornado H, the contaminated air from the contaminated air source is
As shown in the conventional example in Figure 1, arrow! 11R (without leaking to the outside), the air is quickly discharged to the outside by the suction vibrator 7 at an approximately uniform maximum wind speed over the entire peripheral edge of the circular air suction port 4. In other words, the circular air The suction wind speed at the suction port 4 is as shown by a curve y'', where the required control wind speed V at one periphery is the fastest (and slightly slower at the center).

Therefore, since the necessary control wind speed V is secured in the peripheral area and contaminated air is sucked in, the contaminated air does not leak to the outside, and there is no need to suck in more contaminated air than necessary. Since the wind speed is slow, it is possible to reduce the amount of air sucked in compared to when sucking in at the average wind speed.

In this embodiment, the artificial tornado type hood l of the present invention is provided above the source of contaminated air, but the invention is not limited to this, and may be provided to the side or below.

5 and 6 show other embodiments of the artificial tornado type hood of the present invention. This example and Figures 1 to 4
The difference from the embodiment shown in the figure is that terminal boxes 6 are provided at four locations every 90 degrees around the entire circumference of the spiral wall 3.
A suction port 5 is provided in the side wall 9.9 of each terminal box 6, and the four terminal boxes 6 are connected to a collection box 13 via a collection duct 12 formed in a cross shape. 13
is connected to the suction vibrator 7 penetrated through the approximate center of the plate-like wall 2. Therefore, this artificial tornado-type hood i
° is such that artificial tornadoes H are stably formed in the spaces 8 within the spiral wall 3, each heading towards the suction port 5 of the terminal box 6. Other configurations and operations are similar to those of the embodiment shown in FIGS. 1 to 4, so reference numerals are attached to the drawings and explanation thereof will be omitted.

7 and 8 show another embodiment of the artificial tornado type hood of the present invention, and the artificial tornado type hood of this embodiment 1"
The difference from the embodiment shown in FIGS. 1 to 4 is that a spiral wall 3 is connected to a rectangular plate-like wall 2, so that the overall shape is rectangular. Note that the shape of this plate-like wall 2 is not particularly limited and may be elliptical or polygonal.Other configuration 1 functions are the same as in the embodiment shown in FIGS. 1 to 4. Therefore, reference numerals are attached to the drawings and explanation thereof will be omitted.

Figure 9 and Figure 1O show another embodiment of the artificial tornado type hood of the present invention.
The difference from the embodiment shown in FIGS. 1 to 4 is that the terminal box 6 is provided in four locations, similar to the embodiment shown in FIGS. 5 and 6, and the overall shape of the hood is different from the embodiment shown in FIGS. It has a rectangular shape as shown in Figures 7 and 8.Other configurations and functions are the same as those in the embodiment shown in Figures 1 to 4, so reference numbers are attached to the drawings for explanation. omitted.

Effects of the Invention 1 As detailed above, the artificial tornado type hood of the present invention includes a plate-shaped wall for receiving air to be exhausted, and a wall surface that extends along the periphery of the plate-shaped wall and gradually moves toward the center. A spiral wall formed as shown in FIG. When air is sucked from the suction port, the contaminated air enters from the air suction port and flows along the spiral wall whose wall surface gradually moves toward the center, forming a swirling airflow. A negative pressure area is formed in the center by suction of air from the suction port, and this negative pressure area forms part of the negative pressure core along the center of the swirling airflow, and the centrifugal force and negative pressure of these swirling airflows create a negative pressure area. The centripetal force of a part of the core is balanced, and a continuous artificial tornado is generated toward the suction port, and this artificial tornado achieves a uniform maximum suction wind speed over the entire periphery of the air suction port, removing contaminated air. will be promptly eliminated. Therefore, there is no need to suck in excess air or install baffles in order to obtain the required controlled wind speed, so the exhaust gas treatment equipment such as the suction blower and dust collector can be made smaller, and pressure loss can also be reduced. In addition, since the H dimension of the hood can be reduced, it does not take up space when installed indoors, and neither a blowing air pipe nor a blower for air blowing is required, so the configuration is simple. Therefore, it can be made smaller, and both manufacturing cost and running cost can be reduced.

Furthermore, if the artificial tornado hood described above is placed to the side, above, or below the source of toxic gas dust, etc., and air is sucked in from the suction port, in addition to the above-mentioned effects, continuous An artificial tornado is generated stably, a uniform suction wind speed is obtained over the entire surface of the air suction port, and toxic gases, dust, etc. can be quickly and stably removed.

[Brief explanation of the drawing]

Figures 1 to 1O show examples of the artificial tornado type hood of the present invention and its usage. Figure 1 is a plan view of the artificial tornado type hood of the present invention, and Figure 2 is the same as that of Figure 1. A sectional view taken along line II-II, Fig. 3 is a side view showing how the artificial tornado type hood is used, Fig. 4 is a schematic diagram showing the required control wind speed, Fig. 5
6 is a sectional view taken along the line Vl-Vl in FIG. 5, FIG. 7 is a plan view showing another embodiment of the invention, and FIG. 8 is a plan view showing another embodiment of the invention. 7 is a sectional view taken along line ■-Vl, FIG. 9 is a plan view showing another embodiment of the present invention, FIG. 1O is a sectional view taken along line XX in FIG. 9, and FIG. 4 and a side view of the circular shape in the conventional example, FIG. 12 is a schematic diagram of FIG. 4 and the circular shape in the conventional example, and FIGS. 13 and 14 are cross-sectional views of the conventional example. 1.1', l", lo"...Artificial tornado type hood 2...Plate wall 3...Spiral wall 4...Air suction port 5...
Suction port H...Artificial tornado

Claims (2)

[Claims] (1) A plate-shaped wall for receiving air to be exhausted, a spiral wall formed along the periphery of the plate-shaped wall so that the wall surface gradually moves toward the center, and a It consists of a suction port located in the central axial direction and an air suction port formed by the tip of the spiral wall. The artificial tornado type hood is characterized in that the air flows along a wall surface gradually moving toward the center of the spiral wall to form a swirling air current, thereby generating an artificial tornado in the axial direction of the center. (2) The artificial tornado type hood according to claim (1) is disposed on the side or above the source where toxic gas, dust, etc. are generated, and the toxic gas, dust, etc. generated from the source is disposed. How to use an artificial tornado type hood that suctions and exhausts air.