JP4193966B2 - Uniform flow blowing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a uniform flow that generates a blown airflow from a ventilator installed in a dust generation workplace such as welding, soldering and polishing, a workplace using organic solvents such as painting and cleaning, an endoscope cleaner using glutaral, and the like. The present invention relates to a blowing device.
[0002]
[Prior art]
In a so-called push-pull type ventilator that uses both an airflow blowing device and an exhaust device, a blowing device that blows out a uniform flow with a cross-section perpendicular to the flow and having a constant flow velocity in the cross-section is used. This is desirable because it does not diffuse harmful substances and improves ventilation efficiency.
The book name “Factory Ventilation” published in 1982 (by Taro Hayashi, published by the Society for Air Conditioning and Sanitary Engineering), page 12, lines 4 to 5, includes “Improve accuracy of velocity distribution uniformity ± If it is suppressed to about 20% or less, a uniform flow is obtained, and the cross section thereof is continuous. "
[0003]
Therefore, the applicant of the present invention first has one surface of the box as an air inflow surface, the surface intersecting the air inflow surface as an air blowing surface, and a rectifying plate such as a punching metal plate or a honeycomb plate is disposed on the air blowing surface. A plurality of distribution plates parallel to the air inflow surface are installed inside the box so as to be spaced apart from each other and partially overlap when viewed from the air inflow surface, and the air flowing into the box is distributed A distribution plate type uniform flow blowing device that distributes evenly and rectifies and blows off with a rectifying plate has been proposed as Japanese Patent Laid-Open No. 2000-320883.
[0004]
By the way, in recent years, it has been required to reduce the thickness of the entire apparatus so that it can be easily installed without taking up space at the work site.
However, in the uniform flow blowing device of the distribution plate type like the above-mentioned conventional one, if the thickness of the air flow distribution portion is reduced, the wind speed inside the box increases, and this tendency becomes prominent near the air inflow surface. Then, as shown in FIG. 9, immediately before the distribution plate a located on the most upstream side, the wind speed of the blowout flow becomes extremely fast, and the variation in the wind speed distribution of the blowout flow tends to increase.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a uniform flow blowing device capable of blowing a uniform flow even if the device is thinned while suppressing an increase in the wind speed inside the box.
[0006]
[Means for Solving the Problems]
Uniform flow balloon device of the present invention, parallel to form an air blow-out surface and the front surface of the hollow box body, an air inlet formed on one side surface intersecting the front surface, the interior of the box body, the one other aspects and a plurality of parallel distribution plate opposite the side surface and to the one side, mutually spaced and arranged, said air balloon surface distribution plate on the most downstream side between each distribution plate and the other side the rear face facing in contact with, the most upstream side of the distributor plate small gap to the air blowout surface near the open only, and were spaced from the rear surface of the box body, the distribution plate of the most upstream the distributor plate on the downstream side spaced from the rear surface of the box body, and, when viewed from the one side, the side edge facing the air outlet surface to the distribution plate of the most upstream of the and arranged so as to overlap, form a flow path over to the other side from the air inlet And, to the air blowout surface, a first porous plate, and a second perforated plate, spaced apart from each other and a honeycomb plate has a rectifying member formed by arranging in parallel, the honeycomb plate wherein the box body while being positioned toward the front of the front of the honeycomb panel be those that no air outlet, in order to solve the above problems, erection has been both sides of the peripheral between the one side and the other side in between the surface and the air outlet surface, closing the front sides an outer circumferential portion of the box body, extending from the air inlet of one side of the box body behind on both sides of the closure on the other side of the box body An air flow passage is formed , the rectifying member is accommodated in an inner central portion of the box, and the first porous plate is disposed so as to coincide with the air blowing surface, and the air blowing on the front surface of the honeycomb plate is arranged. The outlet is flush with the front of the closure on both sides Was, it is characterized in.
[0007]
Air flowing from the air inlet to both sides of the box passes through the air flow passage on either side of the box body. The air that has flowed into the central portion of the box is in the middle of flowing toward the other side, hits the distribution plate in order from the most upstream distribution plate, and each time a part of the airflow is guided to the air blowing surface side. With the configuration in which the air flow passages are provided on both sides of the box, the total cross-sectional area of the air circulation portion is widened, and the wind speed in the box is reduced. In addition, the airflow that bounces off the downstream distribution plate is combined with the airflow that has passed through the distribution plate located on the upstream side, and is blocked by the distribution plate that is arranged to block the cross section and flows back to the air inlet side. Without being dispersed toward the air blowing surface. As a result, the wind speed and direction of the air blown from the air blowing surface are uniformly rectified.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 5, the uniform blowout device 1 includes a hollow box 2 having a rectangular parallelepiped shape, and the outer periphery of the front surface of the box 2 is closed (FIG. 2). front and parallel to the air outlet face 3 of the box body 2 that is formed on the inner side (see FIG. 5). An air inlet 5 ′ is formed on one side surface 5 orthogonal to the air blowing surface 3, and a fan 17 is directly connected to the air inlet 5 ′ (FIG. 2).
[0009]
Inside the box 2 are arranged three distribution plates 14, 15, 16 parallel to one side surface 5 and the other side surface 4 opposite to the one side surface 5 (FIGS. 1 and 4).
The distribution plates 14, 15, 16 are formed of rectangular plates, and these distribution plates 14, 15, 16 are one side surface 5 of the box body 2, each distribution plate 14, 15, 16 and the other side surface 4 of the box body 2. Are arranged so as to be spaced from each other (FIGS. 1 and 3).
[0010]
As shown in FIG. 5, among the distribution plates 14, 15, and 16, the first distribution plate 14 located on the most downstream side with respect to the air flow direction is the rear surface facing the air blowing surface 3 of the box 2. 8 and is arranged so that a gap is formed with the air blowing surface 3. The second distribution plate 15 located on the most upstream side is disposed with a slight gap near the air blowing surface 3 and spaced from the rear surface 8 of the box 2. The third distribution plate 16 disposed between the first distribution plate 14 and the second distribution plate 15 is disposed at a distance from the rear surface 8 of the box 2 and is viewed from the side surface 5. Sometimes, one side edge overlaps with the first distribution plate 14 and the other side edge overlaps with the second distribution plate 15.
[0011]
Therefore, inside the box body 2, the flow path extending from the air inlet 5 'on the other side 4 is formed. Further, inside the box body 2, there are other air inlets 5 ′ on one side surface 5 behind the closed front surfaces on both sides between the peripheral surfaces 6, 7 and the outer peripheral portions on both sides of the front surface of the box body 2. An air flow passage 20 extending toward the side surface 4 is formed (FIGS. 1 , 3 and 4 ).
[0012]
On the air blowing surface 3 of the box 2, a first porous plate 10 made of punching metal, a second porous plate 11 made of punching metal, and a honeycomb plate 12 are arranged in parallel with a space therebetween. rectifying member 19 is disposed made, only toward the honeycomb plate 12 on the outside, the front of the honeycomb panel 12 (outer air outlet face 3) is Do the air outlet 13. In the present embodiment, the rectifying member 19 is housed in the inner central portion of the box body 2 , the first porous plate 10 is disposed so as to coincide with the air blowing surface 3, and the air blowing port on the front surface of the honeycomb plate 12 is disposed. 13 is disposed flush with the front surfaces of the closing portions on both sides, and the entire uniform blowout device 1 is thinned (see FIGS. 2, 3 and 5) .
[0013]
(Example)
The dimensions of the box 2 are such that the front surface is 800 mm × 800 mm, the distance between the front surface and the rear surface 8 facing the front surface is 110 mm, and the thickness of the rectifying member 19 accommodated therein is 45 mm. Further, the outer peripheral portion of the front surface of the box body 2 is closed with a width of 50 mm, and an air blowing surface 3 of 700 mm × 700 mm is formed in the center portion.
Further, the first to third distribution plates 14, 15, 16 are arranged at an equal interval of 175 mm, and an air flow passage having a width of 50 mm is provided behind the closed portion on the front surface of the box 2 inside the peripheral surfaces 6, 7. 20 is formed.
[0014]
Air is sent from the fan 17 through the air inlet 5 to the inside of the box 2, and the wind speed at the measurement point obtained by dividing the air outlet 13 into a 100 mm square lattice is measured.
FIG. 6 is a diagram illustrating measurement points of the wind speed at the air outlet 13. There are a total of 36 measurement points of 6 x 6 in the horizontal direction. The position where the air outlet 13 is equally divided is the origin of coordinates, the Z-axis is taken in the direction of the air sent from the air inlet 5, and the air The X axis is taken in the direction from the left to the right of the blowing surface 3.
For comparison with the uniform flow blowing device 1 of the embodiment, the entire front surface of the box body is opened to form an air blowing surface, and three distribution plates are brought into contact with the peripheral surfaces on both sides, so that both sides of the box body The air velocity was measured at a measurement point at the same position as in the above example using an air flow blowing device (comparative example) having the same structure as in the example except that no air flow passage was formed.
[0015]
The measurement results of the comparative example are shown in FIG. In FIG. 7, the horizontal axis represents the X coordinate position of the measurement point, the vertical axis represents the turbulence ratio (turbulence rate) obtained by dividing the wind speed measured at each measurement point by the average value of the measured wind speed, and This is shown by a line graph.
From FIG. 7, the variation in the wind speed distribution at the air outlet of the comparative example is -20% at the measurement point on the Z = −25 cm axis, which is the maximum, and the most upstream distribution plate and the air inlet 5 ′. Only the wind speed on the Z = −25 cm axis in between is lower than the wind speed at other measurement points.
[0016]
On the other hand, in the uniform flow blowing device 1 of the example, as is apparent from the experimental results shown in FIG. 8, at the measurement point on the Z = −25 cm axis, which showed the largest variation, −14 at the maximum. The average variation was 6.5 points.
In addition, the variation in the wind speed distribution at the entire measurement point is only about 14.5% at maximum, and the variation with the average wind speed is within ± 20%, which satisfies the required performance sufficiently. It was.
From this test result, it was found that by forming the air flow passages on both sides of the box body 2, the increase in the wind speed inside the box body 2 was suppressed, and the variation in the wind speed of the blowout flow was improved.
The first to third distribution plates can be perforated plates, or the number of distribution plates can be two.
[0017]
【The invention's effect】
According to the uniform blowout device of the present invention, the total cross-sectional area of the air circulation portion is widened, and the increase in the wind speed inside the box is suppressed, so the variation in the velocity distribution of the blown airflow is ± 20%. It is possible to generate a highly uniform air flow.
[Brief description of the drawings]
FIG. 1 is a front view of a uniform blowout device according to the present invention. FIG. 2 is a perspective view of the same. FIG. 3 is a plan view of the same. FIG. FIG. 6 is a front view of a uniform flow blowing device explaining measurement points in the embodiment. FIG. 7 is a graph showing the wind speed distribution of the comparative example. FIG. 8 is a graph showing the wind speed distribution of the embodiment. Cross-sectional view explaining the air flow inside the flow outlet device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Uniform flow blowing apparatus 2 Box 3 Air blowing surface 4 Other side surface 5 One side surface 5 'Air inflow port 6,7 Circumferential surface 8 Rear surface 10 1st perforated plate 11 2nd perforated plate 12 Honeycomb plate 13 Air outlet 14 First distribution plate 15 Second distribution plate 16 Third distribution plate 17 Fan 19 Rectifying member 20 Air flow passage

Claims (1)

An air blowing surface is formed in parallel with the front surface of the hollow box, an air inflow port is formed on one side surface intersecting with the front surface, and the one side surface and the other side surface opposite to the one side surface are formed inside the box body. such a plurality of distribution plates, the one side surface, and spaced from each other spacing between each distribution plate and the other side, it abuts the most downstream side of the distributor plate to the rear surface facing the air outlet surface, the most upstream only a small gap distribution plate side to the air blow-out surface near the open, and, spaced from the rear surface of the box body are arranged, wherein the distributor plate on the downstream side with respect to the distributor plate of the most upstream The air inlet is disposed with a space from the rear surface of the box body, and when viewed from the one side surface, a side edge facing the air blowing surface overlaps with the most upstream distribution plate. wherein the flow path is formed over the other side surface from the air blowout surface, the A rectifying member comprising a porous plate, a second porous plate, and a honeycomb plate arranged parallel to each other at an interval, and the honeycomb plate is arranged toward the front surface of the box, In the uniform flow blowing device in which the front surface of the honeycomb plate is an air outlet ,
Between the front face of the box member and the peripheral surface of the installation has been both sides between the one side and the other side, closing the front sides an outer circumferential portion of the box body, said box body behind on both sides of the closure forming an air flow passage extending toward the other side surface of the box body from the air inlet aspect,
The rectifying member is housed in the inner central portion of the box, and the first perforated plate is disposed so as to coincide with the air blowing surface, and the air outlets on the front surface of the honeycomb plate are closed on both sides. Placed flush with the front of the
A uniform blowout device characterized by that.

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