WO2020040273A1

WO2020040273A1 - Local air purification device

Info

Publication number: WO2020040273A1
Application number: PCT/JP2019/032945
Authority: WO
Inventors: 鈴木　剛人; 信哉前田
Original assignee: 興研株式会社
Priority date: 2018-08-24
Filing date: 2019-08-23
Publication date: 2020-02-27
Also published as: JP7401915B2; JPWO2020040273A1; TW202019545A

Abstract

This local air purification device (1) is provided with: a push hood (2) having an air flow open surface (23) for blowing out a purified uniform air flow; a guide (3) which is provided on the air flow open surface (23) side of the push hood (2), extends the uniform air flow from the air flow open surface (23) side toward a downstream side, and forms an open surface (31) on a downstream-side end section; and a first laminar flow generation device (41) which is arranged inside the guide (3) and blows out a laminar flow (41a) in a direction approximately perpendicular to the direction in which the uniform air flow is blown out from the air flow open surface (23). The first laminar flow generation device (41) moves dust generated inside the guide (3) to the peripheral edge of the inside of the guide (3) by means of the laminar flow (41a) blown out in the approximately perpendicular direction, and the push hood (2) discharges the dust, moved to the peripheral edge of the inside of the guide (3) by the first laminar flow generation device (41), out of the guide (3) by the uniform air flow blown out from the air flow open surface (23).

Description

Local air purifier

The present invention relates to a local air cleaning device.

Conventionally, a clean bench is often used as a device for improving the air cleanliness of a local work space. In a general clean bench, only a surface in front of a workbench has an opening for work, and other surfaces are enclosed to maintain cleanliness. In such a clean bench, a clean air outlet is disposed in the enclosure, and an operator works by putting his / her hand through a front working opening.

However, since the working opening of the clean bench is narrow, there is a problem in the workability when an operator performs assembling work of a precision machine or the like. In addition, when products and manufactured parts are moved, as in a production line, measures such as putting the entire line in a clean room have been taken.However, this has the problem that the equipment becomes large-scale. is there.

For this reason, a pair of push hoods that can blow out a uniform flow of purified air are arranged so that the air flow opening surfaces thereof face each other, and the air flows from the respective air flow opening surfaces collide with each other. A local air cleaning device has been proposed which can make a region between push hoods as a clean air space having higher cleanliness than other regions (Patent Document 1).

In addition, the air flow opening surface of one push hood is arranged so as to face an air collision surface such as a wall, and the air flow from the air flow opening surface collides with the air collision surface. A local air cleaning device has been proposed that can make a region between the above and the other region a clean air space having higher cleanliness than other regions (Patent Document 2).

JP 2008-275266 A JP 2013-068396 A

By the way, when an operator works in the above-mentioned clean air space or activates a production line arranged in the clean air space, dust may be generated. The conventional local air cleaning device moves generated dust to the downstream side (for example, the air collision surface side facing the air flow opening surface) by the air flow blown out from the air flow opening surface, and after a while, clean air Could be discharged from space. However, when working on the downstream side simultaneously with the generation of dust, there is also a demand for quick discharge from the work space.

The present invention has been made in view of the above problems, and it is an object of the present invention to maintain high cleanliness in a working space in which a work is actually being performed by moving dust generated by the work in the clean air space to the outside of the working space. It is an object of the present invention to provide a local air cleaning device capable of performing the following.

In order to achieve the above object, the local air cleaning device according to the first aspect of the present invention includes:
A push hood having an air flow opening surface for blowing out a purified uniform air flow;
A guide that is provided on the airflow opening surface side of the push hood, extends from the airflow opening surface side toward the downstream side of the uniform airflow, and forms an opening surface at a downstream end.
The push hood is arranged such that a uniform air stream, which is blown out from the airflow opening surface, passes through the guide and then strikes an air collision surface downstream of the opening surface of the guide. And, by facing the opening surface of the guide away from the air collision surface to form an open area between the opening surface of the guide and the air collision surface,
The purified uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, so that other air flows in the guide and the open region. In a local air purification device that has a higher cleanness compared to the area,
A first laminar flow generator that is disposed downstream of a position where dust is generated in the guide and that blows out a laminar flow in a direction substantially perpendicular to a direction in which the uniform air flow is blown out from the air flow opening surface. With
The first laminar flow generation device moves the dust generated in the guide to a peripheral edge in the guide by a laminar flow blown out in the substantially orthogonal direction,
The push hood is configured to discharge the dust moved to a peripheral edge in the guide by the first laminar flow generation device out of the guide by a uniform airflow blown out from the airflow opening surface.

The local air cleaning device according to the second aspect of the present invention includes:
A push hood having an air flow opening surface for blowing out a purified uniform air flow;
A guide that is provided on the airflow opening surface side of the push hood, extends from the airflow opening surface side toward the downstream side of the uniform airflow, and forms an opening surface at a downstream end.
The push hood is arranged such that a uniform air stream, which is blown out from the airflow opening surface, passes through the guide and then strikes an air collision surface downstream of the opening surface of the guide. And, by facing the opening surface of the guide away from the air collision surface to form an open area between the opening surface of the guide and the air collision surface,
The purified uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, so that other air flows in the guide and the open region. In a local air purification device that has a higher cleanness compared to the area,
A first laminar flow generator that is disposed downstream of a position where dust is generated in the guide and that blows out a laminar flow in a direction substantially perpendicular to a direction in which the uniform air flow is blown out from the air flow opening surface. With
In the guide, a hole is formed at a position where a laminar flow blown from the first laminar flow generator collides with the guide,
The first laminar flow generating device discharges dust generated in the guide from the hole to the outside of the guide by a laminar flow blown in a direction substantially orthogonal to the guide.

In the local air cleaning device according to the first aspect,
At a peripheral edge in the guide, a position where a laminar flow blown out from the first laminar flow generation device collides with the guide, and is located downstream of the first laminar flow generation device, A second laminar flow generator that blows out a laminar flow substantially parallel to a direction in which the uniform air flow is blown out from the air flow opening surface toward the opening surface,
The second laminar flow generator blows out the laminar flow substantially in parallel with a flow velocity higher than the flow velocity of the uniform air flow,
The second laminar flow generating device discharges the dust moved to the periphery in the guide by the first laminar flow generating device out of the guide by the laminar flow blown out in substantially parallel.

Further, in the local air cleaning device according to the first and second aspects,
A flow rate of the laminar flow blown in the substantially orthogonal direction by the first laminar flow generator is 3 to 25 times a flow rate of the uniform air flow blown out by the push hood.

Further, in the local air cleaning device according to the first and second aspects,
The first laminar flow generator sucks air upstream of the first laminar flow generator in the uniform airflow.

ADVANTAGE OF THE INVENTION According to this invention, the local air purification apparatus which can maintain high cleanliness in the working space which is actually working by moving the dust generated by the work in the clean air space to the outside of the working space. Can be provided.

FIG. 2 is a diagram illustrating an example of a local air cleaning device according to the first embodiment. It is a figure showing the structure of a push food. FIG. 2 is a diagram illustrating an example of a local air cleaning device according to the first embodiment. It is a figure showing an example of a local air cleaning device concerning Embodiment 2. FIG. 13 is a diagram illustrating an example of a local air cleaning device according to a third embodiment. FIG. 14 is a diagram illustrating an example of a local air cleaning device according to a fourth embodiment. FIG. 4 is a plan view of the local air cleaning device according to Embodiments 1 to 3. FIG. 2 is a side view of the local air cleaning device according to the first embodiment. FIG. 9 is a side view of the local air cleaning device according to the second embodiment. FIG. 13 is a side view of the local air cleaning device according to the third embodiment. FIG. 13 is a side view of the local air cleaning device according to the fourth embodiment. FIG. 13 is a side view of the local air cleaning device according to the fourth embodiment. FIG. 13 is a side view of the local air cleaning device according to the fourth embodiment. FIG. 14 is a side view of the local air cleaning device according to the fifth embodiment. FIG. 14 is a side view of the local air cleaning device according to the fifth embodiment. FIG. 14 is a side view of the local air cleaning device according to the fifth embodiment. FIG. 13 is a side view of the local air cleaning device according to the sixth embodiment. It is a top view of the local air purifier which concerns on Example 7. FIG. 14 is a side view of the local air cleaning device according to the seventh embodiment. It is a top view of the local air purifier which concerns on Example 7. FIG. 14 is a side view of the local air cleaning device according to the seventh embodiment.

Hereinafter, the local air cleaning device of the present invention will be described with reference to FIGS.

(Embodiment 1)
As shown in FIG. 1, a local air cleaning device 1 according to the present embodiment includes a push hood 2 arranged to face an air collision surface W such as a wall or a screen, and a guide provided on the push hood 2. 3 and a first laminar flow generator 41 disposed in the guide 3. FIG. 1 is a diagram of the local air cleaning device 1 viewed from a side. In the present embodiment and the embodiments described below, a table 5 is arranged in the guide 3, and a device 6 as a dust generation source that generates dust is installed on the table 5. The air cleaning device 1 will be described.

FIG. 1 shows a state in which the device 6 generates dust and the first laminar flow generating device 41 is not operating. An arrow (for example, arrow 28) in FIG. 1 indicates a flow of a uniform airflow blown from the push hood 2. The color of the arrow indicates the degree of contamination in the guide 3. The darker the arrow, the more dust there is at that location. In FIG. 1, at the same height as the dust generating device 6, the dust is moving in the guide on a uniform air flow, and the clean air space in the guide is most contaminated.

The uniform air flow and the uniform flow here are synonymous with the uniform flow described in Taro Hayashi, “Factory Ventilation” (The Society of Air Conditioning and Sanitary Engineers, issued in 1982). This refers to the flow at a slight wind speed that does not produce any wind. However, the present invention does not intend to provide an air blowing device in which the flow velocity and velocity distribution of air are strictly defined. The uniform air flow preferably has, for example, a variation in velocity distribution in the absence of an obstacle within ± 50%, and more preferably ± 30% of the average value.

The push hood 2 only needs to have a mechanism for blowing out a purified uniform air flow. The push hood 2 has a basic structure of a push hood conventionally used in a push-pull ventilator and has a cleaning filter provided therein. A structure can be adopted.

The push hood 2 of the present embodiment has nine (three by three) horizontal push hoods 2a whose air flow opening surfaces are in the same direction, and the short sides of the push hood 2a The sides are arranged and connected so as to be adjacent to each other. FIG. 2 shows the structure of the push hood 2a. The structure of the other connected push hood 2a is basically the same.

As shown in FIG. 2, the housing 21 of the push hood 2a is formed in a substantially rectangular parallelepiped shape, and an air flow suction surface 22 is formed on one surface thereof. The air flow suction surface 22 is, for example, a surface in which a plurality of holes are formed on one entire surface of the housing 21. In the air flow suction surface 22, outside air and room air, which are ambient air outside the push hood 2a, are taken in from the holes. On the other surface of the housing 21 opposite to the air flow suction surface 22, an air blowing surface (air flow opening surface) 23 is formed. The air flow opening surface 23 is, for example, a surface in which a plurality of holes are formed on one entire surface of the housing 21. In the air flow opening surface 23, a uniform air flow of clean air formed in the push hood 2a is blown out of the push hood 2a from this hole. The size of the airflow opening surface 23 of the push hood 2a is not particularly limited, but is, for example, 1050 mm × 850 mm.

The push hood 2 is arranged such that the air flow opening surface 23 faces an air collision surface W such as a wall. Here, that the air flow opening surface 23 faces the air collision surface W is not limited to a state in which the air flow opening surface 23 of the push hood 2 and the air collision surface W face each other. 2 includes a state where the airflow opening surface 23 and the air collision surface W are slightly inclined. It is preferable that the inclination between the air flow opening surface 23 and the air collision surface W of the push hood 2 is within a range of about 30 ° between the air flow opening surface 23 and the air collision surface W.

In the housing 21, an air blowing mechanism 24, a high-performance filter 25, and a rectifying mechanism 26 are arranged.

風 The blower mechanism 24 is disposed on the side of the airflow suction surface 22 in the housing 21. The blowing mechanism 24 includes a fan for blowing air and the like. The blower mechanism 24 takes in outside air or room air, which is the air around the push hood 2a, from the airflow suction surface 22 and blows out the airflow from the airflow opening surface 23. Further, the blower mechanism 24 is formed so as to vary the flow velocity of the airflow blown from the airflow opening surface 23 by controlling the blowout force of the fan.

(4) The high-performance filter 25 is disposed between the blower mechanism 24 and the rectifier mechanism 26. The high-performance filter 25 is composed of a high-performance filter according to a cleaning level such as a HEPA filter (High Efficiency Particulate Air Filter) or an ULPA filter (Ultra Low Penetration Air Filter) for filtering the taken-in surrounding air. . The high-performance filter 25 purifies the surrounding air taken in by the blower mechanism 24 to clean air of a desired cleaning level. The clean air that has been cleaned to a desired cleaning level by the high-performance filter 25 is sent to the rectifying mechanism 26 by the blowing mechanism 24.

The rectifying mechanism 26 is disposed between the high-performance filter 25 and the airflow opening surface 23. The rectifying mechanism 26 includes an air resistor (not shown), and is formed of a punching plate, a net member, or the like. The rectification mechanism 26 blows air that is blown from the high-performance filter 25 and has a bias in the amount of air flow to the entire airflow opening surface 23, and makes the airflow uniform to the entire airflow opening surface 23 without bias in the amount of airflow. (Rectified) to the air flow (uniform air flow). This rectified uniform airflow is blown out of the push hood 2 from the entire airflow opening surface 23 by the blowing mechanism 24.

In the push hood 2a, as shown in FIG. 2, it is preferable that a pre-filter 27 is disposed between the air flow suction surface 22 in the housing 21 and the blower mechanism 24. As the pre-filter 27, for example, a medium-performance filter is used. By disposing the pre-filter 27 between the air flow suction surface 22 and the air blowing mechanism 24, relatively large dust contained in the surrounding air sucked into the housing 21 through the air flow suction surface 22 can be removed. Thus, the performance of the high-performance filter 25 in which clogging or the like easily occurs can be maintained for a long period of time.

In the push hood 2a configured as described above, the surrounding air taken in by the blowing mechanism 24 is purified by the pre-filter 27 and the high-performance filter 25 into clean air of a desired cleaning level. Then, the purified clean air is rectified into a uniform air flow by the rectification mechanism 26. The uniform airflow thus cleaned is blown out from the entire airflow opening surface 23 to the outside in a direction substantially perpendicular to the airflow opening surface 23 of the push hood 2a.

The flow rate of the uniform air flow blown out from the air flow opening surface 23 is preferably 0.2 to 0.7 m / s. By blowing at a flow velocity in this range, the uniform air flow moves so as to be pushed out in the guide 3 and the state of the uniform air flow is easily maintained in the guide 3.

The guide 3 has one end provided on the airflow opening surface 23 side of the push hood 2. The guide 3 is provided on the air flow opening surface 23, extends from the air flow opening surface 23 toward the downstream side of the uniform air flow blown from the air flow opening surface 23, and covers the outer peripheral contour of the air flow opening surface 23. It is formed as follows. For example, when the shape of the airflow opening surface 23 is a quadrangle, the airflow opening surface 23 is formed so as to have a U-shaped cross section. The open side of the U-shape and the floor surface include an outer peripheral portion in the direction of the uniform airflow, and the periphery of the airflow in parallel with the flow of the uniform airflow blown therefrom. It is in a state of surrounding in a tunnel shape. The guide 3 is formed so as to have an open area between the guide 3 and the other end (opening surface 31). In the case where the shape of the airflow opening surface 23 is a quadrangle, the cross-sectional shape may be extended and formed so as to be not a U-shape but a square shape.

The guide 3 can be formed of any material as long as the air flow blown from the opening surface 31 can maintain a state of a clean and uniform air flow from the air flow opening surface 23. It is possible. Further, the guide 3 does not need to completely cover the entire periphery of the uniform air flow as long as the state of the purified uniform air flow from the air flow opening surface 23 can be maintained. A hole may be partially formed or a slit may be formed.

The guide 3 is arranged such that the opening surface 31 thereof faces the air collision surface W. By arranging the opening surface 31 so as to face the air collision surface W, the airflow blown from the opening surface 31 collides with the air collision surface W. For example, when the opening surface 31 is directly opposed to the wall, the uniform air flow exhibits a behavior of changing the direction of the flow substantially perpendicularly upon collision with the air collision surface W. By flowing in this manner, the airflow that has collided with the air collision surface W flows out of the surface where the collision has occurred. As a result, a clean air space is obtained in a region from the surface where the air flow has hit to the end of the opening surface 31.

It is preferable that the shape of the opening surface 31 is formed to be substantially the same as the shape of the airflow opening surface 23. This is because by making the opening surface 31 and the airflow opening surface 23 substantially the same shape, it is easy to maintain the state of the uniform airflow blown from the airflow opening surface 23 at the opening surface 31.

As shown in FIG. 1, the guide 3 configured as described above is provided (attached) from the airflow opening surface 23 side of the push hood 2 toward the downstream side of the uniform airflow, and has a downstream end. The opening surface 31 provided in the portion is disposed so as to face the air collision surface W. Thereby, an open area is formed between the opening surface 31 and the air collision surface W.

The first laminar flow generator 41 blows out a laminar flow in a direction substantially perpendicular to the direction in which the uniform air flow is blown out from the air flow opening surface 23. Then, the first laminar flow generator 41 moves the dust generated in the guide 3 to the peripheral edge in the guide 3 by a laminar flow blown in a direction substantially perpendicular to the dust.

FIG. 3 shows a state in which the first laminar flow generator 41 blows out the laminar flow 41a.

Here, “substantially orthogonal” indicates that the direction in which the uniform air flow is blown out (the direction of arrow 28) and the direction in which the laminar flow 41a is blown out form an angle of about 90 °, for example, ± 10 °. A degree of error is allowed.

{Circle around (3)} The peripheral edge in the guide 3 is a peripheral edge side (upper, lower, left and right end sides) of a surface perpendicular to the flow of the uniform airflow. For example, when the guide 3 is formed to extend in a U-shape, the peripheral edges in the guide 3 are the ceiling inside the guide 3, the both side surfaces inside the guide 3, and the floor. When the guide 3 is formed to extend in a square shape, the peripheral edge in the guide 3 is a ceiling inside the guide 3, a side surface inside the guide 3, and a bottom inside the guide 3.

The first laminar flow generating device 41 is disposed in the guide 3 on the downstream side of the dust generating device 6. The first laminar flow generator 41 moves the dust, which has been flown by the uniform airflow, toward the ceiling in the guide 3 by blowing the laminar flow 41a upward. It is desirable that the first laminar flow generation device 41 is close to the position where dust is generated.

The first laminar flow generator 41 may be any device that can generate a laminar flow. Those that generate turbulence such as electric fans are not suitable because they diffuse dust.

クロス Typically, a cross flow fan (or a line flow fan) is employed as the first laminar flow generator 41. As shown in FIG. 3, the cross flow fan arranged downstream of the table 5 draws in the downstream air 41b of the uniform air flow and blows out the laminar flow 41a. The first laminar flow generation device 41 includes a punching plate and a mesh filter at an intake port that sucks the air 41b. Further, the first laminar flow generator 41 includes a plate-shaped member having a honeycomb structure at an outlet for blowing out the laminar flow 41a. By providing a plate-shaped member having a honeycomb structure at the outlet, it is possible to reduce variations in the wind speed in the width direction of the laminar flow 41a.

The first laminar flow generator 41 always blows out the laminar flow 41a while the uniform air flow is blown out. The flow rate of the laminar flow 41a blown in a direction substantially orthogonal to the first laminar flow generator 41 is preferably 3 to 25 times, and more preferably 5 to 20 times the flow rate of the uniform air flow blown by the push hood 2. Yes, and more preferably 5 to 15 times.

設定 By setting the flow velocity of the laminar flow 41a in the above range, the dust can be moved to the periphery of the guide 3 before the dust is caused to flow downstream by the uniform air flow.

層 The thickness of the laminar flow 41a blown out by the first laminar flow generator 41 is preferably from 50 mm to 200 mm.

設定 By setting the thickness of the laminar flow 41a in the above range, the dust can be moved out of the working space. When the thickness is smaller than the above range, the dust cannot be sufficiently moved, and the dust is caused to flow downstream. If the thickness is larger than the above range, the uniform air flow flowing in the horizontal direction is affected.

It is preferable that the width of the laminar flow 41a blown out by the first laminar flow generator 41 fluctuates in accordance with the width of the dust generation source (device 6). Is preferable.

幅 By setting the width of the laminar flow 41a as described above, it is possible to prevent the dust from flowing downstream from the position where the dust is generated. In addition, the laminar flow 41a is covered with the airflow flowing laterally of the laminar flow 41a, and the airflow on the back side (downstream side) of the laminar flow 41a joins the uniform airflow while being attracted by the uniform airflow. If the dust source is too wide, the airflow behind is not sufficiently attracted to a uniform airflow. If the air flow is not sufficiently induced, for example, when the uniform air flow is 0.3 m / s, the central flow velocity of the rear air flow is 0.1 m / s, and the uniform air flow is not maintained in that portion. . Therefore, the width of the laminar flow 41a blown out by the first laminar flow generator 41 needs to be set to a width that allows the lateral and rear airflows to join the uniform airflow.

(4) The push hood 2 discharges the dust moved to the peripheral edge in the guide 3 by the first laminar flow generator 41 to the outside of the guide 3 by a uniform airflow blown out from the airflow opening surface 23.

粉 As shown in FIG. 3, the dust moved to the ceiling side of the guide 3 is discharged out of the guide 3 along the ceiling, riding on a uniform air flow. Although the ceiling side of the guide 3 is contaminated, the degree of contamination at the height of the table 5 on which the device 6 for generating dust is placed can be reduced. In the open area of FIG. 3, the arrow of the uniform air flow is described in the upward direction, but the invention is not limited thereto, and the uniform air flow in the open area is also blown out in the horizontal direction. .

Generally, work is rarely performed on the periphery of the guide near the ceiling, side, and floor of the guide, and work is performed using other places as work spaces. That is, according to the present embodiment, by moving the dust out of the work space that does not hinder the work, it is possible to maintain high cleanliness in the work space that is actually being worked.

局所 In addition, the local air cleaning device 1 of the present embodiment moves the dust out of the work space by the laminar flow blown out from the first laminar flow generator 41, instead of sucking the dust. In general, when dust is moved by a blown laminar flow, it can be moved far with a small flow rate as compared with the case where dust is moved by suction. Therefore, according to the present embodiment, the dust can be moved to the outside of the work space with a small flow rate, so that the power required for discharging the dust generated during the work can be reduced.

Further, in the local air cleaning device without the first laminar flow generation device 41, in a situation where dust (contaminants) is generated in the guide, the flow velocity of the uniform air flow is set to 0.5 m / s. It has been confirmed that by setting the air flow rate to about the same level, dust can be eliminated more quickly than when the flow velocity of the uniform air flow is set to 0.2 m / s. That is, in the local air cleaning device in which the first laminar flow generation device 41 is not disposed, it is necessary to increase the flow velocity of the uniform air flow in order to quickly remove the dust. On the other hand, in the local air cleaning device 1 of the present invention, the uniform air flow can be quickly eliminated at a flow velocity of 0.3 m / s.

In the local air cleaning device without the first laminar flow generating device 41, in order to quickly move the dust from inside the guide, the flow velocity of the uniform air flow must be set fast. Since the air cleaning device 1 moves the dust to the outside of the working space by the laminar flow blown out from the first laminar flow generating device 41, it is not necessary to set the flow velocity of the uniform air flow fast. Therefore, the local air cleaning device 1 of the present embodiment can set the flow velocity to be low, so that the noise value and the power consumption can be suppressed, and the load on the pre-filter 27 and the high-performance filter 25 is reduced. be able to.

Note that the direction of the laminar flow 41a blown out by the first laminar flow generator 41 is not limited to the upward direction, and may be any direction as long as the laminar flow can be moved to the peripheral edge in the guide.

The first laminar flow generator 41 may blow the laminar flow 41a in accordance with the timing at which dust is generated. For example, the first laminar flow generator 41 has a function of detecting the generation of dust, and when the number of dusts exceeds a predetermined first threshold, the first laminar flow generator 41 blows out the laminar flow 41a. You may do so. Then, when the number of dusts falls below a predetermined second threshold value, the first laminar flow generator 41 may stop blowing the laminar flow 41a. According to such a configuration, it is possible to maintain high cleanliness during actual work with less power as compared with a case where a laminar flow is constantly blown out.

In the above-described embodiment, the present invention has been described by exemplifying a case in which the device 6 for generating dust is installed on the table 5 arranged in the guide 3, but, for example, on the floor downstream of the airflow opening surface 23. The present invention can be applied to a case where a device 6 for generating dust is installed, and is limited to a case where the device 6 is installed on a table 5 arranged in the guide 3. is not.

For example, when a device 6 that generates dust is installed on the floor, the first laminar flow generating device 41 is disposed downstream of the device 6 and above the device 6, and blows out a laminar flow downward. Alternatively, the dust may be moved toward the floor.

In the above-described embodiment, the present invention has been described by taking as an example a case where the device 6 as a dust generation source that generates dust is installed in the guide 3. However, the local air cleaning device 1 having no dust generation source is described. It is possible to apply to.

Further, the local air cleaning device is not limited to the local air cleaning device 1 in which the push hood 2 and the air collision surface W are arranged to face each other. For example, a pair of push hoods 2 oppose each other. It is also possible to use the local air cleaning device 1 arranged such that the push hoods 2 are provided with the guides 3 respectively.

(Embodiment 2)
As shown in FIG. 4, the local air cleaning device 1 according to the present embodiment includes a push hood 2 arranged to face an air collision surface W such as a wall or a screen, and a guide provided on the push hood 2. 3 and a first laminar flow generator 41 disposed in the guide 3.

プッシュ The push hood 2 and the first laminar flow generating device 41 of the present embodiment have the same configuration as that of the first embodiment, and thus the description is omitted. Hereinafter, a configuration of the guide 3 that is different from that of the first embodiment will be described.

穴 In the guide 3, a hole is formed at a position where the laminar flow 41a blown out from the first laminar flow generator 41 collides with the guide 3.

The size of the hole is desirably larger than the collision surface of the laminar flow 41a when the laminar flow 41a collides with the guide 3 where no hole is formed.

穴 By forming a hole of the above size, it is possible to prevent the dust moved by the laminar flow 41a from colliding with the inside of the guide 3 and staying in the guide 3, and efficiently discharging the dust outside the guide 3.

穴 The shape of the hole may be various shapes such as a circle and a rectangle, but it is preferable that the shape is similar to the shape of the laminar flow 41a blown out by the first laminar flow generator 41.

For example, as shown in FIG. 4, when the first laminar flow generator 41 blows out the laminar flow 41a upward, the hole 32 is formed at the position of the ceiling where the laminar flow 41a collides. The first laminar flow generator 41 discharges the dust generated in the guide 3 from the hole 32 of the guide 3 by a laminar flow 41a that blows out in a substantially perpendicular direction.

According to the present embodiment, the dust can be quickly discharged out of the guide without moving the dust to the downstream side in the guide, so that the contamination on the downstream side can be prevented. In the present embodiment, the flow rate of the laminar flow 41a blown in a direction substantially orthogonal to the first laminar flow generator 41 is preferably 3 to 25 times the flow rate of the uniform air flow blown out by the push hood 2. 5 to 20 times is more preferable, and 15 to 20 times is more preferable.

(Embodiment 3)
As shown in FIG. 5, the local air cleaning device 1 according to the present embodiment includes a push hood 2 arranged to face an air collision surface W such as a wall or a screen, and a guide provided on the push hood 2. 3, a first laminar flow generator 41 disposed in the guide 3, and a second laminar flow generator 42 disposed in the guide 3.

プッシュ The push hood 2, the guide 3, and the first laminar flow generator 41 of the present embodiment have the same configurations as those of the first embodiment, and thus the description will be omitted. Hereinafter, the second laminar flow generator 42 will be described.

２The second laminar flow generator 42 has the same function as the first laminar flow generator 41. The second laminar flow generating device 42 is located at a position near the position where the laminar flow 41a blown out from the first laminar flow generating device 41 collides with the guide 3 at the peripheral edge in the guide 3, and It is arranged downstream of the device 41.

The second laminar flow generator 42 blows out the laminar flow 42a toward the opening surface 31 substantially in parallel with the direction in which the uniform air flow is blown out from the air flow opening surface 23.

Here, “substantially parallel” means that the direction in which the uniform air flow is blown out and the direction in which the laminar flow 42a is blown out form an angle of approximately 0 °. For example, an error of about ± 10 ° is allowed. You.

{Circle around (2)} The second laminar flow generator 42 blows out the laminar flow 42a substantially in parallel with the flow velocity higher than the flow velocity of the uniform air flow. For example, if the flow velocity of the laminar flow 42a blown out by the second laminar flow generator 42 is about 30 to 40 times the uniform air flow, dust can be discharged out of the guide 3 before diffusing into the working space.

クロス A cross-flow fan is typically used as the second laminar flow generator 42. As shown in FIG. 5, the cross flow fan arranged on the ceiling of the guide 3 sucks the air 42b below it and blows out the laminar flow 42a.

Thus, the second laminar flow generator 42 discharges the dust moved to the periphery in the guide 3 by the first laminar flow generator 41 to the outside of the guide 3 by the laminar flow 42a which blows out substantially in parallel. As a result, the time during which the dust stays in the guide 3 can be shortened.

According to this embodiment, dust can be quickly discharged out of the guide without deforming the guide, and high cleanliness can be maintained in the working space where the work is actually being performed.

Further, according to the present embodiment, the dust can be effectively moved to the periphery in the guide by the attraction effect of the fast airflow blown out from the second laminar flow generator, and furthermore, the dust does not fall to a low position. Can be

(Embodiment 4)
As shown in FIG. 6, the local air cleaning device 1 according to the present embodiment includes a push hood 2 arranged to face an air collision surface W such as a wall or a screen, and a guide provided on the push hood 2. 3 and a first laminar flow generator 41 disposed in the guide 3.

プッシュ Since the push hood 2 and the guide 3 of the present embodiment have the same configuration as that of the first embodiment, the description is omitted. Hereinafter, the first laminar flow generator 41 will be described.

クロス Typically, a cross flow fan (or a line flow fan) is employed as the first laminar flow generator 41. As shown in FIG. 6, the cross flow fan arranged on the downstream side of the table 5 sucks the air 41c on the upstream side of the uniform air flow and blows out the laminar flow 41a. The first laminar flow generation device 41 includes a punching plate and a mesh filter at an intake port that sucks the air 41c. Further, the first laminar flow generator 41 includes a plate-shaped member having a honeycomb structure at an outlet for blowing out the laminar flow 41a.

The local air cleaning device 1 according to the present embodiment has the same effect as the local air cleaning device 1 according to the first embodiment, and is better than the local air flow cleaning device 1 according to the first embodiment in the reduction rate of the number of dusts. Results can be obtained.

The configuration having the first laminar flow generation device 41 of the present embodiment is not limited to the configuration shown in FIG. The first laminar flow generation device 41 of the present embodiment can be replaced with the first laminar flow generation device 41 of the second and third embodiments.

Hereinafter, specific examples of the present invention will be shown, and the present invention will be described in more detail.

(Example 1)
Using the local air cleaning device 1 of FIG. 3, the number of dust particles was measured at a plurality of measurement positions at different distances and heights.

FIG. 7 is a plan view of the local air cleaning device 1 according to the first embodiment.

The push hood 2 of the local air cleaning device 1 has a push hood 2a having a width of 1050 mm and a length of 850 mm in which the air flow opening surfaces are in the same direction, and the short sides and the long sides of the push hood 2a are adjacent to each other. (3 × 3 × 9), and the size of the opening surface 31 is 3150 mm in width and 2570 mm in height. In the local air cleaning device 1, the purified uniform air flow flows at a flow velocity of 0.3 m / s, and a clean air space is formed.

As described above, in the local air cleaning device 1 in which the uniform air flow is flowing, the device 6 installed on the table 5 uses 5.0 × 10 ⁷ to 6.7 × 10 ⁷ [pieces / m ³ ]. Generated atmospheric dust. The device 6 blows out atmospheric dust by a pump. The height of the table 5 is 800 mm.

第 The first laminar flow generator 41 is located at a position close to the device 6 and downstream thereof. In the plane of FIG. 7, the center of the first laminar flow generation device 41 and the center of the device 6 are on a straight line 7 extending in the x direction, and each center is located at a position 900 mm from the side surface of the guide in the y direction. The first laminar flow generation device 41 transmits a laminar flow 41a having a thickness (x direction in FIG. 7) of 55.7 mm and a width (y direction in FIG. 7) of 760 mm from the top at a flow velocity of 2.1 m / s or 4.6 m / s. I blew out.

測定 The measurement position of the number of dusts in the local air cleaning device 1 of FIG. 3 will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, on the straight line 7, the distance from the upstream end of the first laminar flow generator 41 to the downstream side of the uniform air flow in the uniform air flow is 1000 mm, 2000 mm, 3000 mm, and 4000 mm. The point at 5000 mm was taken as the measurement position in the x direction (hereinafter, referred to as “distance direction”). In addition, points at distances of 0 mm, 900 mm, and 1800 mm from the straight line 7 in the y direction were measured positions in the depth direction.

FIG. 8 shows a side view of the local air cleaning device 1. At each measurement position on the plane shown in FIG. 7, a point at a height from the floor of 400 mm, 800 mm, 1500 mm, or 2200 mm was defined as a measurement position in the height direction.

From the above, the number of dust [pieces / m ³ ] was measured at a total of 60 measurement positions in five distance directions, three in the depth direction, and four in the height direction. Measurements of the number of dust [pieces / ^{m 3]} uses a PMS Co. LASAIR-II, was measured dust particle number size 0.1 [mu] m [pieces / ^{m 3]} at each measurement position. The measurement results are shown in a class representing the degree of cleanliness of ISO14644-1. Classes representing cleanliness are classified into “Class 1” to “Class 9” based on the number and particle size of dust. “Class 1” indicates that the measured number of dust particles [pieces / m ³ ] is the smallest, and thus indicates that the cleanliness is the highest. As the class number goes up by one, the measured dust count [pieces / m ³ ] goes up by one digit, thus indicating lower cleanliness. Generally, the class required for a clean room is said to be “class 5” or lower. Table 1 shows the measurement results.

In Table 1, “upward FAN OFF” indicates a case where the first laminar flow generator 41 does not blow out laminar flow. In addition, at a point of 0 mm in depth, better results were obtained under the condition of a flow velocity of 2.1 m / s than at a flow velocity of 4.6 m / s. Was not measured.

As shown in Table 1, at 800 mm in the vicinity of the height of the table 5, the device 6 for generating dust compared with the case where the laminar flow is not blown out under both the conditions of the flow velocity of 2.1 m / s and 4.6 m / s. It was confirmed that the cleanliness was improved on the downstream side of. That is, it was confirmed that the work space could be prevented from being contaminated on the downstream side of the dust generating device 6. Also, at a height of 2200 mm and 1500 mm, the number of dusts on the downstream side of the dust generating device 6 is lower than that in the case where the laminar flow is not blown out under the conditions of the flow velocity of 2.1 m / s and 4.6 m / s. / M ³ ] was confirmed to increase. That is, it was confirmed that the dust was moved to the ceiling side of the guide 3 outside the working space on the downstream side of the dust generating device 6. In addition, at 800 mm and 400 mm height, cleanliness of class 5 or less could be confirmed at any of the distances under the conditions of the flow rates of 2.1 m / s and 4.6 m / s. A better result was obtained under the condition of a flow velocity of 2.1 m / s. In the case where there is a ceiling as in Example 1, if the flow velocity of the laminar flow to be blown up is high, reflection occurs and dust is diffused, so that a better result was obtained under the condition of a flow velocity of 2.1 m / s. Conceivable.

(Example 2)
Using the local air cleaning device 1 shown in FIG. 4, the number of dust particles was measured at a plurality of measurement positions at different distances and heights.

The method of measuring the push hood 2 and the cleanliness of the local air cleaning device 1 is the same as that of the first embodiment. Further, similarly to the first embodiment, the flow velocity of the uniform air flow is 0.3 m / s, and the flow velocity of the laminar flow 41a generated by the first laminar flow generator 41 is 2.1 m / s or 4.6 m / s. Met. The number of atmospheric dust generated from the device 6 was 3.3 × 10 ⁷ to 4.0 × 10 ⁷ [pieces / m ³ ].

測定 The measurement position of the number of dusts in the local air cleaning device 1 of FIG. 4 will be described with reference to FIGS. 7 and 9.

The measurement position of the plane is the same as in the first embodiment (FIG. 7). FIG. 9 shows a side view of the local air cleaning device 1. The measurement position in the height direction is the same as in the first embodiment (FIG. 8).

Here, the hole 32 formed in the guide 3 is provided at a position where the laminar flow 41 a blown out from the first laminar flow generator 41 collides with the guide 3. In detail, a straight line passing through the upstream end of the first laminar flow generator 41 in the distance direction (x direction in FIG. 7) in the vertical direction (toward the ceiling of the guide 3 in FIG. 8) corresponds to a hole corresponding to the ceiling of the guide 3. Was the starting point. The shape of the hole 32 formed in the guide 3 was rectangular, and was 500 mm long (x direction in FIG. 7) and 1000 mm wide (y direction in FIG. 7).

From the above, the number of dust [pieces / m ³ ] was measured at a total of 60 measurement positions in five distance directions, three in the depth direction, and four in the height direction. As in the case of the first embodiment, the measurement result is represented by a class representing the cleanliness of ISO14644-1. Table 2 shows the measurement results.

As shown in Table 2, at the heights of 800 mm and 400 mm, the flow rate of 2.1 m / s and 4.6 m / s both under the condition that the laminar flow is not blown and the downstream side of the device 6 that generates dust , It was confirmed that the cleanliness was improved. That is, it was confirmed that the work space could be prevented from being contaminated on the downstream side of the dust generating device 6. In addition, even at a height of 1500 mm, it was confirmed that the cleanliness was improved at 4.6 m / s. In addition, at a height of 2200 mm, it was confirmed that the number of dust [pieces / m ³ ] increased on the downstream side of the dust generating device 6 under both the conditions of a flow velocity of 2.1 m / s and 4.6 m / s. That is, it was confirmed that the dust was moved to the vicinity of the ceiling outside the work space on the downstream side of the dust generating device 6. In addition, at the height of 800 mm and 400 mm, the cleanliness of class 4 or less of ISO14644-1 could be confirmed at any flow rate of 2.1 m / s and 4.6 m / s at any distance. A better result was obtained under the condition of about 4.6 m / s. At 4.6 m / s, cleanliness of class 5 or less was confirmed even at a height of 1500 mm. In the case where there is a hole in the ceiling as in Example 2, it was confirmed that a higher flow rate of the laminar flow to be blown up gave better results. Furthermore, comparing the conditions of Example 1 with a flow velocity of 2.1 m / s and the conditions of 4.6 m / s of Example 2, at a height of 800 mm, the condition of 4.6 m / s of Example 2 is better. , Class 3 or less, and the number of dust particles [pieces / m ³ ] was small. That is, it was confirmed that the dust was quickly discharged out of the guide 3 as compared with the example 1.

(Example 3)
Using the local air cleaning device 1 shown in FIG. 5, the number of dusts was measured at a plurality of measurement positions at different distances and heights.

The method of measuring the push hood 2 and the cleanliness of the local air cleaning device 1 is the same as that of the first embodiment. Further, similarly to the first embodiment, the flow velocity of the uniform air flow is 0.3 m / s, and the flow velocity of the laminar flow 41a generated by the first laminar flow generator 41 is 2.1 m / s or 4.6 m / s. Met. The number of atmospheric dust generated from the apparatus 6 was 2.9 × 10 ⁷ to 4.8 × 10 ⁷ [pieces / m ³ ].

The second laminar flow generating device 42 applies a laminar flow 42a having a thickness (x direction in FIG. 7) of 55.7 mm and a width (y direction in FIG. 7) of 760 mm toward the opening surface 31 of the guide. Blowing was performed at 5 m / s or 11.5 m / s.

The measurement position of the number of dusts in the local air cleaning device 1 of FIG. 5 will be described with reference to FIGS.

The measurement position of the plane is the same as in the first embodiment (FIG. 7). FIG. 10 shows a side view of the local air cleaning device 1. The measurement position in the height direction is the same as in the first embodiment (FIG. 8).

Here, the second laminar flow generator 42 is located at a position close to the position where the laminar flow 41 a blown out from the first laminar flow generator 41 collides with the guide 3, and is higher than the first laminar flow generator 41. It was located downstream. As shown in FIG. 10, the position in the distance direction where the second laminar flow generator 42 is arranged is such that the distance from the upstream end of the first laminar flow generator 41 to the downstream direction of the uniform airflow is 1000 mm. It is a point of. In the plane of FIG. 7, the center of the second laminar flow generator 42 is on the straight line 7, and the center is located 900 mm in the depth direction from the side surface of the guide 3.

From the above, the number of dust [pieces / m ³ ] was measured at a total of 60 measurement positions in five distance directions, three in the depth direction, and four in the height direction. As in the case of the first embodiment, the measurement result is represented by a class representing the cleanliness of ISO14644-1. Table 3 shows the measurement results when the flow velocity of the laminar flow 42a blown out by the second laminar flow generator 42 is 9.5 m / s, and Table 4 shows the measurement results when the flow velocity is 11.5 m / s.

Note that the laminar flow 42a blown from the second laminar flow generator 42 is blown out from the first laminar flow generator 41 at a point of 0 mm in depth under both the conditions of the flow velocity of 9.5 m / s and 11.5 m / s. Since better results were obtained under the condition of the flow velocity of 2.1 m / s than the flow velocity of 4.6 m / s of the laminar flow 41a, the depth of 900 mm and 1800 mm were not measured at the flow velocity of 4.6 m / s. Was.

As shown in Tables 3 and 4, at 800 mm and 400 mm near the height of the table 5, both the conditions of the flow velocities of 2.1 m / s and 4.6 m / s compared to the case where the laminar flow was not blown out. It was confirmed that the degree of cleanliness was improved on the downstream side of the device 6 that generates the odor. That is, it was confirmed that the work space could be prevented from being contaminated on the downstream side of the dust generating device 6. Also, at a height of 2200 mm and 1500 mm, it was confirmed that the number of dust [pieces / m ³ ] increased on the downstream side of the dust generating device 6 under the conditions of the flow velocity of 2.1 m / s and 4.6 m / s. did. That is, it was confirmed that the dust was moved to the ceiling side of the guide 3 outside the work space on the downstream side of the dust generating device 6. Further, at the heights of 800 mm and 400 mm, it was possible to confirm the cleanliness of class 5 or less of ISO14644-1 at any distance. Further, when comparing the conditions of Example 1 with the conditions of 11.5 m / s of Example 3, at a height of 800 mm, the conditions of 11.5 m / s of Example 3 have more classes 3 or less, and the [Pcs / m ³ ] was confirmed to be small. That is, it was confirmed that the dust was quickly discharged to the outside of the guide 3 without applying a deformation such as making a hole to the guide 3.

(Example 4)
In the local air cleaning device 1 of FIG. 5, the number of dusts was measured at a plurality of measurement positions while changing the position of the second laminar flow generator 42.

The method of measuring the push hood 2 and the cleanliness of the local air cleaning device 1 is the same as that of the first embodiment. As in the first embodiment, the flow velocity of the uniform air flow was 0.3 m / s, and the flow velocity of the laminar flow 41a generated by the first laminar flow generator 41 was 2.1 m / s. The number of atmospheric dust generated from the apparatus 6 was 5.0 × 10 ⁷ to 6.7 × 10 ⁷ [pieces / m ³ ].

Further, the second laminar flow generator 42 applies a laminar flow 42a having a thickness (x direction in FIG. 7) of 55.7 mm and a width (y direction in FIG. 7) of 760 mm toward the opening surface 31 of the guide. It blew off at 5 m / s.

The position of the second laminar flow generator 42 will be described with reference to FIGS. 11A to 11C. The second laminar flow generator 42 was arranged at three different positions with respect to the first laminar flow generator 41. First, as shown in FIG. 11A, the second laminar flow generator 42 was disposed 1000 mm downstream from the upstream end of the first laminar flow generator 41. Specifically, the laminar flow 42a of the second laminar flow generator 42 was arranged to be blown from a position 1000 mm downstream from the upstream end of the first laminar flow generator 41. Second, as shown in FIG. 11B, the second laminar flow generator 42 was disposed directly above the first laminar flow generator 41. Specifically, in the distance direction (x direction in FIG. 7), the upstream end of the first laminar flow generator 41 and the upstream end of the second laminar flow generator 42 are arranged to be the same. The third one was disposed 1000 mm upstream from the upstream end of the first laminar flow generator 41, as shown in FIG. 11C. Specifically, the laminar flow 42a of the second laminar flow generator 42 was arranged to be blown from a position 1000 mm upstream from the upstream end of the first laminar flow generator 41.

11A to 11C, the measurement positions of the number of dusts [pieces / m ³ ] in the local air cleaning device 1 are points at a distance of 1000 mm, a depth of 0 mm, a height of 400 mm, 800 mm, 1500 mm, and 2,200. That is, the number of dust [pieces / m ³ ] was measured at a total of 12 measurement positions of three positions of the second laminar flow generator 42, one in the distance direction, one in the depth direction, and four in the height direction. As in the case of the first embodiment, the measurement result is represented by a class representing the cleanliness of ISO14644-1. Table 5 shows the measurement results.

In addition, in Table 5, the position of the second laminar flow generator 42 shown in FIG. 11A is the ceiling FAN position + 1000 mm, the position of the second laminar flow generator 42 shown in FIG. 11B is the ceiling FAN position 0 mm, and FIG. 11C. The position of the second laminar flow generator 42 is defined as the ceiling FAN position-1000 mm.

As shown in Table 5, when the height is 800 mm and 400 mm, when the second laminar flow generator 42 is arranged downstream of the first laminar flow generator 41 (FIG. 11A), it shows the highest cleanliness. It was confirmed. This is because the laminar flow 42a of the second laminar flow generator 42 disposed directly above (FIG. 11B) and the upstream side (FIG. 11C) pushes down dust below the second laminar flow generator 42. Can be

(Example 5)
In the local air cleaning device 1 having the first laminar flow generator 41 having different suction port positions, the number of dust particles was measured.

FIGS. 12A to 12C are side views of the local air cleaning device 1. The first laminar flow generation device 41 of the local air cleaning device 1 of FIGS. 12A to 12C is located at a position close to the device 6 and downstream thereof, and the center of the first laminar flow generation device 41 and the device 6 was arranged on the same straight line. The first laminar flow generation device 41 in FIG. 12A sucks the downstream air 41b and blows out the laminar flow 41a. The first laminar flow generator 41 in FIG. 12B sucks the air 41c on the upstream side and blows out the laminar flow 41a. The first laminar flow generator 41 in FIG. 12C sucks air 41d from the floor and blows out laminar flow 41a.

The measuring method of the push hood 2 and the number of dusts of the local air cleaning device 1 of FIGS. 12A to 12C is the same as that of the first embodiment. The flow velocity of the uniform air flow was 0.3 m / s, and the number of atmospheric dust generated from the device 6 was 5.0 × 10 ⁷ to 6.7 × 10 ⁷ [pieces / m ³ ].

The measurement position of the dust in the local air cleaning device 1 of FIGS. 12A to 12C is such that the distance from the downstream end of the first laminar flow generator 41 to the downstream side of the uniform air flow in the uniform air flow is 1000 mm. The height from the floor was 800 mm, and the position on a straight line passing through the center of the first laminar flow generation device 41 and the device 6 was defined as the measurement position.

において At the above measurement positions, the number of dust particles was measured when the outlet size of the first laminar flow generator 41 in FIGS. 12A to 12C was 25 mm, 50 mm, 100 mm, and the blowing air speed was 1 m / s to 6 m / s. As in the case of the first embodiment, the measurement result is represented by a class representing the cleanliness of ISO14644-1. Table 6 shows the measurement results.

において In Table 6, “OFF” indicates a case where the first laminar flow generating device 41 is not blowing out a laminar flow, and “ON” indicates a case where the first laminar flow generating device 41 is blowing out a laminar flow. As shown in Table 6, the laminar flow is blown out under the conditions of the upstream intake (FIG. 12B) among the conditions of the downstream intake (FIG. 12A), the upstream intake (FIG. 12B), and the floor intake (FIG. 12C). It was confirmed that the cleanliness was most improved as compared with the case where no cleaning was performed. Further, under the condition that the position of the intake air is the upstream intake air (FIG. 12B), the cleanness is most improved when the outlet size is 50 mm out of 25 mm, 50 mm, and 100 mm as compared with the case where the laminar flow is not blown out. Make sure you do. That is, it was confirmed that the outlet size was preferably 50 mm. In addition, the highest cleanliness was confirmed under the condition that the position of the intake air was the upstream intake air, the outlet size was 50 mm, and the outlet wind speed was 4 m / s.

(Example 6)
The number of dust particles was measured at a plurality of measurement positions at different distances and heights using the local air cleaning device 1 including the first laminar flow generator 41 having the suction port located on the upstream side.

FIG. 13 is a side view of the local air cleaning device 1 including the first laminar flow generation device 41 in which the suction port is located on the upstream side.

The measuring method of the push hood 2 and the number of dusts of the local air cleaning device 1 of FIG. 13 is the same as that of the first embodiment. The flow velocity of the uniform air flow was 0.3 m / s, and the number of atmospheric dust generated from the device 6 was 5.0 × 10 ⁷ to 6.7 × 10 ⁷ [pieces / m ³ ].

As shown in FIG. 13, the distance from the downstream end of the first laminar flow generator 41 to the downstream side of the uniform air flow is 1000 mm, 2000 mm, 3000 mm, and the height from the floor is 800 mm, 1200 mm. The position on a straight line passing through the center of the first laminar flow generator 41 and the device 6 was defined as the measurement position.

において At the above measurement position, the number of dust particles was measured when the size of the outlet of the first laminar flow generator 41 in FIG. 13 was 50 mm and the blowing wind speed was 2 m / s to 4 m / s. As in the case of the first embodiment, the measurement result is represented by a class representing the cleanliness of ISO14644-1. Table 7 shows the measurement results.

In Table 7, “OFF” indicates a case where the first laminar flow generating device 41 is not blowing out a laminar flow, and “ON” indicates a case where the first laminar flow generating device 41 is blowing out a laminar flow. As shown in Table 7, at a height of 800 mm and 1200 mm, the condition at a wind speed of 4 m / s is better than the condition at a wind speed of 2 m / s and 3 m / s as compared to a case where a laminar flow is not blown out. It was confirmed that the cleanliness was improved. That is, it was confirmed that the blowing speed of the first laminar flow generator 41 was preferably 4 m / s.

(Example 7)
The wind speed in the local air cleaning device 1 when the first laminar flow generator 41 emitted a laminar flow was measured.

The push hood 2 of the local air cleaning device 1 of FIGS. 14A, 14B, 15A and 15B has a push hood 2a having a width of 1050 mm and a length of 850 mm in the same direction as that of the push hood 2a. The short side and the long side are arranged so that they are adjacent to each other and connected (15 vertically 3 × 5 horizontally). The size of the opening surface 31 is 5250 mm in width and 2570 mm in height. is there. The uniform air flow blown out from the push hood 2 flows at a flow rate of 0.3 m / s, and a clean air space is formed.

14A and 14B show a plan view and a side view of the local air cleaning device 1 when the first laminar flow generator 41 blows out the laminar flow 41a upward, and FIGS. 15A and 15B show the first laminar flow. FIG. 3 shows a plan view and a side view of the local air cleaning device 1 in a case where the generator 41 blows out a laminar flow 41a in a horizontal direction (y direction).

The table 5 is located at the center of the local air cleaning device 1 in the y direction, and the first laminar flow generation device 41 shown in FIGS. 14A, 14B, 15A, and 15B is a position close to the table 5 and It was located downstream. As shown in FIGS. 14A and 14B, the center of the first laminar flow generator 41 that blows out laminar flow upward and the center of the table 5 are located on the straight line 8. As shown in FIGS. 15A and 15B, the first laminar flow generator 41 that blows out laminar flow in the horizontal direction is located at the downstream end of the table 5.

In the case of the first laminar flow generator 41 that blows out a laminar flow upward, as shown in FIG. 14A, the downstream side of the uniform laminar air flow from the downstream end of the first laminar flow generator 41 in the uniform laminar air flow ( The points at distances of 1000 mm, 2000 mm, and 3000 mm to the x direction) were taken as measurement positions in the distance direction. In addition, points at which the distance from the straight line 8 in the y direction is −400 mm, 0 mm, and +400 mm were determined as measurement positions in the depth direction. In addition, as shown in FIG. 14B, points at heights from the floor of 400 mm, 800 mm, 1200 mm, and 1600 mm were measured positions in the height direction.

In the case of the first laminar flow generator 41 that blows out a laminar flow in the lateral direction, as shown in FIG. 15A, the downstream side of the uniform laminar flow from the downstream end of the first laminar flow generator 41 in the uniform airflow ( The points at distances of 1000 mm, 2000 mm, and 3000 mm to the x direction) were taken as measurement positions in the distance direction. Further, points at distances of 0 mm, 400 mm, 800 mm, and 1200 mm from the outlet of the first laminar flow generator 41 in the y direction were measured positions in the depth direction. In addition, as shown in FIG. 15B, points at 400 mm, 800 mm, and 1200 mm from the floor were measured positions in the height direction.

風 Wind speed [m / s] was measured at the above measurement position. Table 8 shows the measurement results in the case of the first laminar flow generator 41 that blows out laminar flow upward, and Table 9 shows the measurement results in the case of the first laminar flow generator 41 that blows out laminar flow in the horizontal direction.

In Table 8, “upstream airflow ON” indicates a case where the first laminar flow generator 41 blows out a laminar flow upward, and “upstream airflow OFF” indicates that the first laminar flow generator 41 does not blow out a laminar flow. Show the case. As shown in Table 8, it was confirmed that the wind speed distribution was within ± 50% under the condition of “upstream air flow ON” and the condition of “upstream air flow OFF”. Further, it was confirmed that there was almost no difference in the distribution of the airflow between the condition of “upstream airflow ON” and the condition of “upstream airflow OFF”.

In Table 9, "lateral airflow ON" indicates a case where the first laminar flow generator 41 blows out laminar flow in the horizontal direction, and "lateral airflow OFF" indicates that the first laminar flow generator 41 does not blow out laminar flow. Show the case. As shown in Table 9, it was confirmed that the wind speed distribution was within ± 50% under the conditions of “sideways airflow ON” and “sideways airflow OFF”. In addition, it was confirmed that there was almost no difference in the airflow distribution between the condition of “lateral airflow ON” and the condition of “lateral airflow OFF”.

よう As shown in Tables 8 and 9, it was confirmed that the direction of the laminar flow of the first laminar flow generator 41 and the presence or absence of the laminar flow did not affect the wind speed distribution. That is, it was confirmed that the laminar flow blown out by the first laminar flow generator 41 did not affect the flow of the uniform air flow.

The present invention allows various embodiments and modifications without departing from the broad meaning and scope of the present invention. Further, the above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications made within the scope of the claims and the scope of the invention equivalent thereto are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2018-157443 filed on Aug. 24, 2018. The specification, claims and drawings of Japanese Patent Application No. 2018-157443 are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 1

Local air cleaner

2, 2a Push hood 21 Housing 22 Air flow suction surface 23 Air blowing surface (air flow opening surface)
24 blower mechanism 25 high-performance filter 26 rectifier mechanism 27 pre-filter 28 arrow 3 guide 31 opening surface 32 hole 41 first laminar flow generator 41a

laminar flow

41b, 41c, 41d air 42 second laminar flow generator 42a laminar flow 42b air 5 Table 6 Equipment 7, 8 Straight line W Air collision surface

Claims

A push hood having an air flow opening surface for blowing out a purified uniform air flow;
A guide that is provided on the airflow opening surface side of the push hood, extends from the airflow opening surface side toward the downstream side of the uniform airflow, and forms an opening surface at a downstream end.
The push hood is arranged so that a uniform air stream, which is blown out from the air flow opening surface, passes through the guide and then collides with an air collision surface on the downstream side of the opening surface of the guide. And, by facing the opening surface of the guide away from the air collision surface, to form an open area between the opening surface of the guide and the air collision surface,
The purified uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, thereby causing another inside of the guide and the inside of the open region to flow through the inside of the guide and the inside of the open region. In a local air purification device that has a higher cleanness compared to the area,
A first laminar flow generator that is disposed downstream of a position where dust is generated in the guide and that blows out a laminar flow in a direction substantially perpendicular to a direction in which the uniform air flow is blown out from the air flow opening surface. With
The first laminar flow generation device moves the dust generated in the guide to a peripheral edge in the guide by a laminar flow blown out in the substantially orthogonal direction,
The push hood discharges the dust moved to the periphery in the guide by the first laminar flow generation device to outside of the guide by a uniform airflow blown out from the airflow opening surface. Air purifier.
A push hood having an air flow opening surface for blowing out a purified uniform air flow;
A guide that is provided on the airflow opening surface side of the push hood, extends from the airflow opening surface side toward the downstream side of the uniform airflow, and forms an opening surface at a downstream end.
The push hood is arranged such that a uniform air stream, which is blown out from the airflow opening surface, passes through the guide and then strikes an air collision surface downstream of the opening surface of the guide. And, by facing the opening surface of the guide away from the air collision surface to form an open area between the opening surface of the guide and the air collision surface,
The purified uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open region, so that other air flows in the guide and the open region. In a local air purification device that has a higher cleanness compared to the area,
A first laminar flow generator that is disposed downstream of a position where dust is generated in the guide and that blows out a laminar flow in a direction substantially perpendicular to a direction in which the uniform air flow is blown out from the air flow opening surface. With
In the guide, a hole is formed at a position where a laminar flow blown from the first laminar flow generator collides with the guide,
The local air cleaning device, wherein the first laminar flow generating device discharges dust generated in the guide to the outside of the guide from the hole by a laminar flow that is blown in a direction substantially orthogonal to the guide.
At a peripheral edge in the guide, a position where a laminar flow blown out from the first laminar flow generation device collides with the guide, and is located downstream of the first laminar flow generation device, A second laminar flow generator that blows out a laminar flow substantially parallel to a direction in which the uniform air flow is blown out from the air flow opening surface toward the opening surface,
The second laminar flow generator blows out the laminar flow substantially in parallel with a flow velocity higher than the flow velocity of the uniform air flow,
The said 2nd laminar flow generator discharges the dust moved to the periphery in the said guide by the said 1st laminar flow generator to the outside of a said guide by the said laminar flow which blows out substantially in parallel. Item 2. The local air cleaning device according to Item 1.
The flow rate of the laminar flow blown in the substantially orthogonal direction by the first laminar flow generator is 3 to 25 times the flow rate of the uniform air flow blown out by the push hood. The local air cleaning device according to any one of claims 1 to 4.
The local air according to any one of claims 1 to 4, wherein the first laminar flow generator sucks air upstream of the first laminar flow generator in the uniform airflow. Purification equipment.