JP7401915B2 - local air purification device - Google Patents

Description

TECHNICAL FIELD The present invention relates to local air purification devices.

Conventionally, a clean bench has often been used as a device to improve air cleanliness in a local work space. In a typical clean bench, only the surface in front of the workbench is open for work, and the other surfaces are enclosed to maintain cleanliness. In such a clean bench, a clean air outlet is arranged within the enclosure, and the worker works by inserting his/her hand through the work opening in the front.

However, since the working opening of the clean bench is narrow, there is a problem in workability when a worker performs work such as assembling a precision machine. Additionally, in cases where products and manufactured parts are moved, such as on a production line, measures have been taken to put the entire line inside a clean room, but this poses the problem of making the equipment large-scale. be.

For this reason, by arranging the airflow opening surfaces of a pair of push hoods that can blow out a uniform flow of purified air and making the airflow from each airflow opening surface collide, A local air cleaning device has been proposed that can make the area between the push hoods a clean air space with a higher degree of cleanliness than other areas (Patent Document 1).

In addition, by arranging the air flow opening surface of one push hood to face an air collision surface such as a wall, and colliding the air flow from the air flow opening surface with the air collision surface, the push hood and the air collision surface A local air cleaning device has also been proposed that can make the area between the two areas a clean air space with a higher degree of cleanliness than other areas (Patent Document 2).

JP2008-275266A Japanese Patent Application Publication No. 2013-068396

By the way, when a worker works in the above-mentioned clean air space or operates a production line arranged in the clean air space, dust may be generated. Conventional local air purification devices move generated dust to the downstream side (for example, to the air impingement surface facing the air flow opening surface) by the air flow blown out from the air flow opening surface, and after a while, clean air is generated. It was possible to eject it from the space. However, when working downstream at the same time dust is generated, there is a desire to quickly remove it from the work space.

The present invention has been made in view of the above-mentioned problems, and aims to maintain a high level of cleanliness in the work space where work is actually performed by moving dust generated by work in the clean air space to outside the work space. The purpose of the present invention is to provide a local air purification device that is capable of

In order to achieve the above object, the local air purification device according to the first aspect of the present invention includes:
a push hood having an airflow opening surface that blows out a purified uniform airflow;
a guide provided on the airflow opening side of the push hood, extending from the airflow opening side toward the downstream side of the uniform airflow, and forming an opening surface at the downstream end;
The push hood is arranged such that the purified uniform air flow blown out from the airflow opening passes through the guide and then impinges on an air impingement surface on the downstream side of the opening of the guide. and forming an open area between the opening surface of the guide and the air collision surface by arranging the opening surface of the guide away from and facing 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 area, thereby causing the inside of the guide and the open area to flow into other areas. In a local air purification device that provides a high degree of cleanliness compared to the area,
a first laminar flow generating device disposed downstream of a position where dust is generated in the guide, and blowing out a laminar flow in a direction substantially perpendicular to the direction in which the uniform airflow is blown out from the airflow opening surface; Equipped with
The first laminar flow generating device moves dust generated within the guide to a peripheral edge within the guide by a laminar flow blown out in the substantially orthogonal direction;
The push hood is characterized in that the dust moved to the periphery of the guide by the first laminar flow generating device is discharged out of the guide by a uniform air flow blown out from the air flow opening surface.

The local air purification device according to the second aspect of the present invention includes:
a push hood having an airflow opening surface that blows out a purified uniform airflow;
a guide provided on the airflow opening side of the push hood, extending from the airflow opening side toward the downstream side of the uniform airflow, and forming an opening surface at the downstream end;
The push hood is arranged such that the purified uniform air flow blown out from the airflow opening passes through the guide and then impinges on an air impingement surface on the downstream side of the opening of the guide. and forming an open area between the opening surface of the guide and the air collision surface by arranging the opening surface of the guide away from and facing 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 area, thereby causing the inside of the guide and the open area to flow into other areas. In a local air purification device that provides a high degree of cleanliness compared to the area,
a first laminar flow generating device disposed downstream of a position where dust is generated in the guide, and blowing out a laminar flow in a direction substantially perpendicular to the direction in which the uniform airflow is blown out from the airflow opening surface; Equipped with
A hole is formed in the guide at a position where the laminar flow blown out from the first laminar flow generator collides with the guide,
The first laminar flow generation device is characterized in that dust generated within the guide is discharged from the hole to the outside of the guide by a laminar flow blown out in the substantially orthogonal direction.

In the local air purification device according to the first aspect,
located at a peripheral edge within the guide at a position close to a position where the laminar flow blown out from the first laminar flow generation device collides with the guide and downstream of the first laminar flow generation device; further comprising a second laminar flow generator that blows out a laminar flow toward the opening surface substantially parallel to the direction in which the uniform airflow is blown out from the airflow opening surface,
The second laminar flow generator blows out a laminar flow in the substantially parallel direction at a flow rate faster than the flow rate of the uniform air flow,
The second laminar flow generating device is characterized in that the dust moved to the periphery of the guide by the first laminar flow generating device is discharged out of the guide by the laminar flow blown out substantially in parallel.

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

Further, in the local air purification device according to the first and second aspects,
The first laminar flow generation device is characterized in that it sucks air on the upstream side of the first laminar flow generation device in the uniform air flow.

According to the present invention, there is provided a local air purification device that can maintain a high degree of cleanliness in the work space where work is actually being performed by moving dust generated by work in the clean air space to outside the work space. can be provided.

1 is a diagram showing an example of a local air purification device according to Embodiment 1. FIG. It is a figure showing the structure of a push hood. 1 is a diagram showing an example of a local air purification device according to Embodiment 1. FIG. FIG. 3 is a diagram showing an example of a local air purification device according to a second embodiment. 7 is a diagram illustrating an example of a local air purification device according to a third embodiment. FIG. It is a figure showing an example of a local air cleaning device concerning Embodiment 4. 1 is a plan view of a local air cleaning device according to Examples 1 to 3. FIG. 1 is a side view of a local air purification device according to Example 1. FIG. FIG. 2 is a side view of a local air purification device according to a second embodiment. FIG. 7 is a side view of a local air purification device according to Example 3. FIG. 4 is a side view of a local air purification device according to a fourth embodiment. FIG. 4 is a side view of a local air purification device according to a fourth embodiment. FIG. 4 is a side view of a local air purification device according to a fourth embodiment. FIG. 7 is a side view of a local air purification device according to Example 5. FIG. 7 is a side view of a local air purification device according to Example 5. FIG. 7 is a side view of a local air purification device according to Example 5. FIG. 7 is a side view of a local air purification device according to a sixth embodiment. FIG. 7 is a plan view of a local air purification device according to Example 7. FIG. 7 is a side view of a local air purification device according to Example 7. FIG. 7 is a plan view of a local air purification device according to Example 7. FIG. 7 is a side view of a local air purification device according to Example 7.

Hereinafter, the local air purifying device of the present invention will be explained with reference to FIGS. 1 to 15.

(Embodiment 1)
As shown in FIG. 1, the local air purifying 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 within the guide 3. FIG. 1 is a side view of the local air purification device 1. As shown in FIG. In this embodiment and the embodiments described below, a table 5 is disposed inside the guide 3, and a device 6 as a dust generation source that generates dust is installed on the table 5, as an example. The air purifying device 1 will be explained.

FIG. 1 shows a state in which the device 6 generates dust and the first laminar flow generator 41 is not operating. The arrows in FIG. 1 (eg, arrow 28) indicate the flow of the uniform airflow blown out of the push hood 2. Further, the color of the arrow indicates the degree of contamination within the guide 3. The darker the color of the arrow, the more dust there is. In FIG. 1, at the same height as the device 6 generating dust, the dust moves within the guide on a uniform air flow, and the clean air space within the guide is most contaminated.

The uniform air flow and uniform flow mentioned here are synonymous with the uniform flow described in "Factory Ventilation" by Rintaro (published by the Society of Air Conditioning and Sanitary Engineers in 1982), and are uniformly continuous and have large vortex parts. A flow with a slight wind speed that does not occur. However, the present invention does not attempt to provide an air blowing device in which the air flow velocity and velocity distribution are strictly defined. It is preferable that the uniform airflow has a variation in velocity distribution within ±50%, more preferably within ±30%, with respect to the average value in the absence of obstacles, for example.

The push hood 2 may be of any type as long as it has a mechanism for blowing out a uniform stream of purified air, and the push hood 2 has a basic structure of the push hood conventionally used in push-pull type ventilation devices and has a cleaning filter installed inside. structure can be adopted.

In the push hood 2 of this embodiment, the nine push hoods 2a (3 vertically x 3 horizontally) have their airflow openings in the same direction, and the short sides of the push hoods 2a The edges are arranged and connected so that they are adjacent to each other. FIG. 2 shows the structure of the push hood 2a. Note that the structures of the other connected push hoods 2a are basically the same.

As shown in FIG. 2, the housing 21 of the push hood 2a is formed into 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 over one entire surface of the housing 21. In the air flow suction surface 22, ambient air outside the push hood 2a or indoor air is taken in through this hole. Furthermore, an air blowing surface (airflow opening surface) 23 is formed on the other surface of the housing 21 that faces the airflow suction surface 22 . The airflow opening surface 23 is, for example, a surface in which a plurality of holes are formed over one entire surface of the housing 21 . At the air flow opening surface 23, a uniform air flow of clean air formed within the push hood 2a is blown out from the hole to the outside of the push hood 2a. The size of the air flow opening surface 23 of the push hood 2a is not particularly limited, but is, for example, 1050 mm x 850 mm.

The push hood 2 is arranged such that its airflow opening surface 23 faces an air collision surface W such as a wall. Here, the expression that the air flow opening surface 23 faces the air collision surface W is not limited to the state in which the air flow opening surface 23 of the push hood 2 and the air collision surface W directly face each other. This also includes a case where the airflow opening surface 23 of No. 2 and the air collision surface W are slightly inclined. The angle between the air flow opening surface 23 and the air collision surface W of the push hood 2 is preferably within a range of about 30 degrees.

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

The air blowing mechanism 24 is arranged within the housing 21 on the airflow suction surface 22 side. The blowing mechanism 24 includes a fan for blowing out air. The blower mechanism 24 takes in outside air or indoor air, which is the air surrounding the push hood 2a, from the airflow suction surface 22 and blows out an airflow from the airflow opening surface 23. Further, the blower mechanism 24 is configured to be able to vary the flow velocity of the airflow blown out from the airflow opening surface 23 by controlling the blowout force of the fan.

The high-performance filter 25 is arranged between the blower mechanism 24 and the rectifier mechanism 26. The high-performance filter 25 is composed of high-performance filters depending on the cleanliness level, such as a HEPA filter (High Efficiency Particulate Air Filter) and a ULPA filter (Ultra Low Penetration Air Filter) for filtering the surrounding air taken in. . The high-performance filter 25 purifies the surrounding air taken in by the blower mechanism 24 to a desired cleaning level. The clean air that has been purified to a desired cleaning level by the high-performance filter 25 is sent to the rectification mechanism 26 by the blower mechanism 24 .

The rectifying mechanism 26 is arranged between the high performance filter 25 and the air flow opening surface 23. The rectifying mechanism 26 includes an air resistance body (not shown), and is formed from a punching plate, a net member, or the like. The rectifying mechanism 26 converts the air blown from the high-performance filter 25, which has a biased ventilation amount over the entire airflow opening surface 23, into a uniform airflow system that has an even ventilation amount over the entire airflow opening surface 23. Correct (rectify) the air flow to a uniform air flow (uniform air flow). This rectified uniform airflow is blown out from the entire airflow opening surface 23 to the outside of the push hood 2 by the blowing mechanism 24.

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

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

Note that the flow velocity of the uniform airflow blown out from the airflow opening surface 23 is preferably 0.2 to 0.7 m/s. This is because by blowing out at a flow velocity within this range, a uniform airflow moves as if being pushed out within the guide 3, and it is easy to maintain a uniform airflow state within the guide 3.

One end of the guide 3 is provided on the air flow opening surface 23 side of the push hood 2. Further, the guide 3 is provided on the airflow opening surface 23 , extends from there toward the downstream side of the uniform airflow blown out from the airflow opening surface 23 , and covers the outer peripheral contour of the airflow opening surface 23 . It is formed like this. For example, when the airflow opening surface 23 has a rectangular shape, it is stretched so that its cross-sectional shape is U-shaped. The open side of this U-shape and the floor surface include the outer circumferential contour in the direction of the uniform air flow, and the circumference of the air flow parallel to the flow of the uniform air flow discharged from there. It will be surrounded by a tunnel. The guide 3 is formed to have an open area between it and the other end (opening surface 31). Note that when the airflow opening surface 23 has a rectangular shape, the cross-sectional shape may be stretched so as to have a square shape instead of a U shape.

The guide 3 can be formed of any material as long as the airflow blown out from the opening surface 31 can maintain a clean, uniform airflow state from the airflow opening surface 23. It is possible. Further, the guide 3 does not need to completely cover the entire circumference of the uniform air flow, as long as it is possible to maintain a clean uniform air flow from the air flow opening surface 23. A hole may be formed in a part or a slit may be formed.

The guide 3 is arranged so that its opening surface 31 faces the air collision surface W. Since the opening surface 31 is arranged to face the air collision surface W, the air flow blown out from the opening surface 31 collides with the air collision surface W. For example, when the opening surface 31 is directly opposed to a wall, when the uniform air flow collides with the air collision surface W, the direction of the flow changes almost vertically. By flowing in this way, the airflow that has collided with the air collision surface W flows out to the outside of the collided surface. As a result, a clean air space is obtained in the area from the surface where the airflow collides to the end of the opening surface 31.

The shape of the opening surface 31 is preferably formed to have substantially the same shape as 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 a uniform airflow state blown out from the airflow opening surface 23 at the opening surface 31.

As shown in FIG. 1, the guide 3 configured in this way is provided (attached) toward the downstream side of the uniform airflow from the airflow opening surface 23 side of the push hood 2, and is attached to the downstream end thereof. The opening surface 31 provided in the section is arranged 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 a uniform airflow is blown out from the airflow opening surface 23 . Then, the first laminar flow generator 41 moves the dust generated within the guide 3 to the periphery within the guide 3 using a laminar flow blown out in a substantially perpendicular direction.

FIG. 3 shows how the first laminar flow generator 41 blows out the laminar flow 41a.

Here, "substantially orthogonal" refers to the direction in which the uniform air flow is blown out (the direction of the arrow 28) and the direction in which the laminar flow 41a is blown out, forming an angle of approximately 90°, for example, ±10°. A certain degree of error is allowed.

Further, the periphery inside the guide 3 is the periphery side (top, bottom, left and right end sides) of a plane perpendicular to the flow of uniform airflow. For example, when the guide 3 is formed to extend into a U-shape, the periphery inside the guide 3 is the ceiling inside the guide 3, both side surfaces inside the guide 3, and the floor. Further, when the guide 3 is formed to be stretched in a square shape, the periphery inside the guide 3 is the inner ceiling of the guide 3, the inner side surface of the guide 3, and the inner bottom of the guide 3.

The first laminar flow generating device 41 is arranged within the guide 3 on the downstream side of the device 6 that generates dust. The first laminar flow generator 41 moves the dust that has been swept away by the uniform air flow toward the ceiling inside the guide 3 by blowing out the laminar flow 41a upward. Note that it is desirable that the first laminar flow generator 41 be located close to a position where dust is generated.

The first laminar flow generator 41 may be any device that can generate laminar flow. Items that generate turbulent flow, such as electric fans, are not suitable as they will spread the dust.

As the first laminar flow generator 41, a cross flow fan (or line flow fan) is typically employed. As shown in FIG. 3, the crossflow fan disposed downstream of the table 5 sucks in air 41b on the downstream side of the uniform airflow and blows out a laminar flow 41a. The first laminar flow generator 41 includes a punching plate and a mesh filter at an intake port for sucking air 41b. Further, the first laminar flow generator 41 includes a plate-like member having a honeycomb structure at an outlet for blowing out the laminar flow 41a. By providing the outlet with a plate member having a honeycomb structure, it is possible to reduce variations in wind speed in the width direction of the laminar flow 41a.

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

By setting the flow velocity of the laminar flow 41a within the above range, the dust can be moved to the periphery of the guide 3 before being swept downstream by the uniform air flow.

Further, the thickness of the laminar flow 41a blown out by the first laminar flow generator 41 is preferably 50 mm to 200 mm.

By setting the thickness of the laminar flow 41a within the above range, dust can be moved out of the work space. If it is thinner than the above range, the dust cannot be moved sufficiently and the dust will be washed downstream. Also, if it is thicker than the above range, it will affect the uniform airflow flowing in the horizontal direction.

Further, it is preferable that the width of the laminar flow 41a blown out by the first laminar flow generation device 41 varies according to the width of the dust generation source (device 6), and furthermore, the width of the dust generation source is at least 200 mm left and right. It is preferable to add the width of .

By setting the width of the laminar flow 41a as described above, it is possible to prevent dust from flowing downstream from the position where dust is generated. Note that the laminar flow 41a is covered by the airflow flowing beside the laminar flow 41a, and the airflow on the back side (downstream side) of the laminar flow 41a merges with the uniform airflow while being attracted by the uniform airflow. If the dust source is too wide, the airflow behind it will not be sufficiently attracted to the uniform airflow. If it is not sufficiently attracted, for example, if the uniform airflow is 0.3m/s, the flow velocity at the center of the rear airflow will be 0.1m/s, and the uniform airflow will not be maintained in that part. . 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 merge into a uniform airflow.

The push hood 2 discharges the dust moved to the periphery of the guide 3 by the first laminar flow generating device 41 to the outside of the guide 3 by a uniform air flow blown out from the air flow opening surface 23.

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 in 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 dust generating device 6 is placed can be reduced. Although the arrow of the uniform airflow is shown upward in the open area in FIG. 3, the uniform airflow in the open area is not limited to this, but can also be blown out horizontally. .

Generally, work is rarely performed on the periphery of the guide near the ceiling, side surfaces, and floor of the guide, and work is performed using areas other than these as work spaces. That is, according to the present embodiment, by moving dust outside the work space where it does not interfere with work, a high level of cleanliness can be maintained within the work space where work is actually being performed.

In addition, the local air purifying device 1 of this embodiment does not suck in dust, but moves the dust out of the work space using a laminar flow blown out from the first laminar flow generator 41. In general, compared to moving dust by suction, when dust is moved by a laminar flow blown out, it is possible to move the dust farther with a smaller flow rate. Therefore, according to this embodiment, the dust can be moved out of the work space with a small flow rate, so the power required to discharge the dust generated during work can be reduced.

In addition, in a local air cleaning device that does not include the first laminar flow generator 41, in a situation where dust (contaminants) is generated within the guide, the flow velocity of the uniform air flow is reduced to 0.5 m/s. It has been confirmed that by setting the uniform air flow velocity to 0.2 m/s, dust can be removed more quickly than when the uniform air flow velocity is set to 0.2 m/s. In other words, in a local air cleaning device in which the first laminar flow generator 41 is not arranged, it is necessary to increase the flow velocity of the uniform air flow in order to quickly remove dust. On the other hand, in the local air purifying device 1 of the present invention, the uniform air flow can be quickly removed at a flow rate of 0.3 m/s.

In a local air cleaning device that does not include the first laminar flow generator 41, the flow velocity of the uniform air flow must be set quickly in order to quickly move dust from within the guide. Since the air purifying device 1 moves dust out of the work space by the laminar flow blown out from the first laminar flow generating device 41, there is no need to set the flow velocity of the uniform air flow quickly. Therefore, the local air purifying device 1 of the present embodiment can set the flow velocity to be low, so that the noise level and power consumption can be suppressed, and the load on the pre-filter 27 and the high-performance filter 25 can be 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, but may be in any direction as long as it can be moved to the periphery within the guide.

Further, the first laminar flow generator 41 may be configured to blow out the laminar flow 41a in accordance with the timing when 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 dust exceeds a predetermined first threshold, the first laminar flow generator 41 blows out the laminar flow 41a. You can do it like this. Then, when the number of dust particles falls below a predetermined second threshold value, the first laminar flow generator 41 may stop blowing out the laminar flow 41a. According to such a configuration, it is possible to maintain a high degree of cleanliness during actual work with less power than when blowing out a laminar flow all the time.

In the above embodiment, the present invention has been explained using an example in which the device 6 that generates dust is installed on the table 5 disposed in the guide 3. It is possible to apply the present invention even when the device 6 that generates dust is installed in the guide 3, and it is limited to the case where the device 6 is installed on the table 5 placed inside the guide 3. isn't it.

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

In the above embodiment, the present invention has been explained using an example in which the device 6 as a dust generation source that generates dust is installed in the guide 3, but the local air purifying device 1 does not have a dust generation source. It is possible to apply it to

Further, the local air purification device is not limited to the local air purification device 1 arranged such that the push hood 2 and the air collision surface W face each other; for example, a pair of push hoods 2 are arranged facing each other. A local air purifying device 1 may be used in which each push hood 2 is provided with a guide 3.

(Embodiment 2)
As shown in FIG. 4, the local air purifying 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 within the guide 3.

The push hood 2 and the first laminar flow generator 41 of this embodiment have the same configurations as those of the first embodiment, so a description thereof will be omitted. Hereinafter, the configuration of the guide 3 that is different from the first embodiment will be explained.

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 preferably larger than the collision surface of the laminar flow 41a when the laminar flow 41a collides with the guide 3 without holes.

By forming the holes of the above size, the dust moved by the laminar flow 41a can be prevented from colliding with the inside of the guide 3 and remaining inside the guide 3, and can be efficiently discharged to the outside of the guide 3.

The shape of this hole can be various shapes such as circular or rectangular, but it is desirable 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 a laminar flow 41a upward, a hole 32 is formed at a position in the ceiling where the laminar flow 41a collides. The first laminar flow generating device 41 discharges dust generated within the guide 3 from the hole 32 of the guide 3 using a laminar flow 41a that is blown out in a substantially perpendicular direction.

According to this embodiment, the dust can be quickly discharged outside the guide without moving the dust to the downstream side within the guide, thereby preventing contamination on the downstream side. In this embodiment, the flow velocity of the laminar flow 41a blown out in a substantially orthogonal direction by the first laminar flow generator 41 is preferably 3 to 25 times the flow velocity of the uniform air flow blown out by the push hood 2. More preferably 5 to 20 times, and even more preferably 15 to 20 times.

(Embodiment 3)
As shown in FIG. 5, the local air purifying 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 generation device 41 disposed within the guide 3, and a second laminar flow generation device 42 disposed within the guide 3.

The push hood 2, the guide 3, and the first laminar flow generator 41 of this embodiment have the same configurations as those of the first embodiment, so a description thereof will be omitted. The second laminar flow generator 42 will be explained below.

The 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 on the periphery of the guide 3, and It is arranged downstream of the device 41.

The second laminar flow generator 42 blows out a laminar flow 42a toward the opening surface 31 substantially parallel to the direction in which the uniform airflow is blown out from the airflow 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°, and for example, an error of approximately ±10° is allowed. Ru.

Further, the second laminar flow generator 42 blows out a laminar flow 42a substantially in parallel at a flow rate faster than the flow rate 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 that of the uniform air flow, the dust can be discharged out of the guide 3 before being diffused into the work space.

A cross flow fan is typically employed as the second laminar flow generator 42. As shown in FIG. 5, the crossflow fan placed on the ceiling of the guide 3 sucks air 42b below and blows out a laminar flow 42a.

In this way, the second laminar flow generator 42 discharges the dust moved to the periphery inside the guide 3 by the first laminar flow generator 41 to the outside of the guide 3 by the laminar flow 42a that is blown out substantially in parallel. Thereby, the time that dust stays in the guide 3 can be shortened.

According to this embodiment, dust can be quickly discharged outside the guide without deforming the guide, and high cleanliness can be maintained in the work space during actual work.

Further, according to the present embodiment, the attraction effect of the fast airflow blown out from the second laminar flow generator allows the dust to be effectively moved to the periphery of the guide, and furthermore, it is possible to prevent the dust from falling to a low position. It can be done.

(Embodiment 4)
As shown in FIG. 6, the local air purifying 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 within the guide 3.

The push hood 2 and guide 3 of this embodiment have the same configurations as those of the first embodiment, so a description thereof will be omitted. The first laminar flow generator 41 will be explained below.

As the first laminar flow generator 41, a cross flow fan (or line flow fan) is typically employed. As shown in FIG. 6, the crossflow fan disposed downstream of the table 5 sucks in air 41c on the upstream side of the uniform airflow and blows out a laminar flow 41a. The first laminar flow generator 41 includes a punching plate and a mesh filter at an intake port for sucking air 41c. Further, the first laminar flow generator 41 includes a plate-like member having a honeycomb structure at an outlet for blowing out the laminar flow 41a.

The local air purification device 1 of this embodiment has the same effect as the local air purification device 1 of Embodiment 1, and is better than the local air flow purification device 1 of Embodiment 1 in terms of the reduction rate of the number of dust particles. You can get good results.

Note that the configuration including the first laminar flow generator 41 of this embodiment is not limited to the aspect shown in FIG. 6. The first laminar flow generation device 41 of this embodiment can be replaced with the first laminar flow generation device 41 of the second and third embodiments.

Hereinafter, the present invention will be explained in more detail by showing specific examples of the present invention.

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

FIG. 7 shows a plan view of the local air purifying device 1 in Example 1.

The push hood 2 of the local air purifying device 1 has a push hood 2a with a width of 1050 mm and a length of 850 mm so that its air flow opening faces are in the same direction and the short sides and long sides of the push hood 2a are adjacent to each other. They are arranged and connected (9 pieces, 3 pieces vertically x 3 pieces horizontally), and the size of the opening surface 31 is 3150 mm in width and 2570 mm in height. Inside the local air purification device 1, the purified uniform air flow flows at a flow rate of 0.3 m/s, forming a clean air space.

In the local air purifying device 1 where a uniform air flow flows in this way, from the device 6 installed on the table 5, 5.0×10 ⁷ to 6.7×10 ⁷ [pieces/m ³ ] of atmospheric dust. The device 6 blows out atmospheric dust using a pump. The height of the table 5 is 800 mm.

Further, the first laminar flow generating device 41 was placed close to the device 6 and on the downstream side thereof. In the plane of FIG. 7, the center of the first laminar flow generator 41 and the center of the device 6 were on a straight line 7 extending in the x direction, and each center was located 900 mm from the guide side surface in the y direction. The first laminar flow generator 41 generates 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 rate of 2.1 m/s or 4.6 m/s. I burst out laughing.

The measurement position of the number of dust particles in the local air purifying device 1 shown in FIG. 3 will be explained using FIGS. 7 and 8.

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

FIG. 8 shows a side view of the local air purification device 1. At each measurement position on the plane shown in FIG. 7, points at heights of 400 mm, 800 mm, 1500 mm, and 2200 mm from the floor were defined as measurement positions in the height direction.

As described above, the number of dust particles [pieces/m ³ ] was measured at a total of 60 measurement positions: 5 in the distance direction, 3 in the depth direction, and 4 in the height direction. The number of dust particles [pieces/m ³ ] was measured using LASAIR-II manufactured by PMS, and the number of dust particles [pieces/m ³ ] having a particle diameter of 0.1 μm at each measurement position was measured. The measurement results are shown in ISO14644-1 cleanliness classes. Classes representing cleanliness are divided into "Class 1" to "Class 9" based on the number and particle size of dust particles. "Class 1" indicates the lowest number of measured dust particles [pieces/m ³ ], and therefore indicates the highest degree of cleanliness. As the class number increases by one, the measured dust count [pieces/m ³ ] increases by one digit, thus indicating lower cleanliness. Generally, the required class for a clean room is said to be "Class 5" or lower. The measurement results are shown in Table 1.

In Table 1, "UPWARD FAN OFF" indicates a case where the first laminar flow generator 41 is not blowing out laminar flow. In addition, at a point with a depth of 0 mm, better results were obtained under conditions of a flow velocity of 2.1 m/s than with a flow velocity of 4.6 m/s, so for a flow velocity of 4.6 m/s, positions at depths of 900 mm and 1800 mm were obtained. No measurements were taken.

As shown in Table 1, at a height of 800 mm near the height of the table 5, the dust generating device 6 It was confirmed that the cleanliness level was improved on the downstream side. That is, it was confirmed that contamination of the work space could be prevented on the downstream side of the device 6 that generates dust. Furthermore, at heights of 2200 mm and 1500 mm, the number of dust particles [ It was confirmed that the number of particles/m ³ ] increased. That is, it was confirmed that on the downstream side of the device 6 that generates dust, the dust was moved to the ceiling side of the guide 3 outside the work space. Further, at heights of 800 mm and 400 mm, cleanliness of class 5 or lower was confirmed at both flow speeds of 2.1 m/s and 4.6 m/s. Note that better results were obtained under the condition of a flow rate of 2.1 m/s. When there is a ceiling as in Example 1, if the velocity of the laminar flow is high, reflection will occur and the dust will be dispersed, so better results were obtained with a flow velocity of 2.1 m/s. Conceivable.

(Example 2)
Using the local air purification 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 push hood 2 of the local air purification device 1 and the method of measuring the cleanliness are the same as in the first embodiment. Further, as in Example 1, 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 particles generated from the device 6 was 3.3×10 ⁷ to 4.0×10 ⁷ [pieces/m ³ ].

The measurement position of the number of dust particles in the local air purifying device 1 shown in FIG. 4 will be explained using FIGS. 7 and 9.

The measurement position on the plane is the same as in Example 1 (FIG. 7). FIG. 9 shows a side view of the local air purification device 1. The measurement position in the height direction is also the same as in Example 1 (FIG. 8).

Here, the hole 32 formed in the guide 3 was provided at a position where the laminar flow 41a blown out from the first laminar flow generator 41 collides with the guide 3. In detail, the position where 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 (direction to the ceiling of the guide 3 in FIG. 8) hits the ceiling of the guide 3 is the hole. It was used as the starting point. The hole 32 formed in the guide 3 was rectangular and had a length of 500 mm (in the x direction of FIG. 7) and a width of 1000 mm (in the y direction of FIG. 7).

As described above, the number of dust particles [pieces/m ³ ] was measured at a total of 60 measurement positions: 5 in the distance direction, 3 in the depth direction, and 4 in the height direction. As in Example 1, the measurement results are shown in classes representing cleanliness according to ISO14644-1. The measurement results are shown in Table 2.

As shown in Table 2, at heights of 800 mm and 400 mm, for both flow velocity conditions of 2.1 m/s and 4.6 m/s, compared to the case where no laminar flow is blown out, the downstream side of the device 6 that generates dust It was confirmed that cleanliness improved. That is, it was confirmed that contamination of the work space could be prevented on the downstream side of the device 6 that generates dust. Furthermore, it was confirmed that the cleanliness was improved at 4.6 m/s even at a height of 1500 mm. Further, at a height of 2200 mm, it was confirmed that the number of dust particles [pieces/m ³ ] increased on the downstream side of the device 6 that generates dust under both conditions of 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 device 6 that generates dust. In addition, at heights of 800 mm and 400 mm, we were able to confirm the cleanliness of ISO 14644-1 class 4 or lower at both flow speeds of 2.1 m/s and 4.6 m/s. Generally, better results were obtained under the condition of 4.6 m/s. Furthermore, at 4.6 m/s, cleanliness of class 5 or lower was confirmed even at a height of 1500 mm. It was confirmed that when there is a hole in the ceiling as in Example 2, better results can be obtained if the laminar flow is blown up at a higher flow rate. Furthermore, when comparing the condition of flow velocity 2.1 m/s in Example 1 and the condition of 4.6 m/s in Example 2, at a height of 800 mm, the condition of 4.6 m/s in Example 2 is better. It was confirmed that there were many particles of class 3 or lower, and the number of dust particles [pieces/m ³ ] was small. That is, compared to Example 1, it was confirmed that dust was quickly discharged to the outside of the guide 3.

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

The push hood 2 of the local air purification device 1 and the method of measuring the cleanliness are the same as in the first embodiment. Further, as in Example 1, 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 particles generated from the device 6 was 2.9×10 ⁷ to 4.8×10 ⁷ [pieces/m ³ ].

Further, the second laminar flow generator 42 directs a laminar flow 42a having a thickness (x direction in FIG. 7) of 55.7 mm and a width (y direction of FIG. 7) of 760 mm toward the opening surface 31 of the guide at a flow rate of 9.7 mm. It blew out at 5 m/s or 11.5 m/s.

The measurement position of the number of dust particles in the local air purifying device 1 shown in FIG. 5 will be explained using FIGS. 7 and 10.

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

Here, the second laminar flow generation device 42 is located closer to the position where the laminar flow 41a blown out from the first laminar flow generation device 41 collides with the guide 3, and is closer to the position than the first laminar flow generation device 41. placed on the downstream side. 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 air flow is 1000 mm. This is the point. Further, in the plane of FIG. 7, the center of the second laminar flow generator 42 was on the straight line 7, and the center was located 900 mm from the side surface of the guide 3 in the depth direction.

As described above, the number of dust particles [pieces/m ³ ] was measured at a total of 60 measurement positions: 5 in the distance direction, 3 in the depth direction, and 4 in the height direction. As in Example 1, the measurement results are shown in classes representing cleanliness according to 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 under both conditions of flow velocity of 9.5 m/s and 11.5 m/s of the laminar flow 42a blown out from the second laminar flow generation device 42, the laminar flow 42a blown out from the first laminar flow generation device 41 at a depth of 0 mm. Since better results were obtained under the conditions of a flow velocity of 2.1 m/s than with the flow velocity of 4.6 m/s of the laminar flow 41a, measurements at depths of 900 mm and 1800 mm were not performed for a flow velocity of 4.6 m/s. Ta.

As shown in Tables 3 and 4, at 800 mm and 400 mm near the height of table 5, under both flow velocity conditions of 2.1 m/s and 4.6 m/s, dust It was confirmed that the cleanliness level was improved downstream of the device 6 that generates . That is, it was confirmed that contamination of the work space could be prevented on the downstream side of the device 6 that generates dust. In addition, at heights of 2200 mm and 1500 mm, it was confirmed that the number of dust particles [pieces/m 3 ] increases on the downstream side of the device 6 that generates dust under both flow velocity conditions 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 device 6 that generates dust. Furthermore, at both heights of 800 mm and 400 mm, cleanliness levels of ISO 14644-1 class 5 or lower were confirmed. Furthermore, when comparing the 11.5 m/s condition of Example 1 and Example 3, at a height of 800 mm, the 11.5 m/s condition of Example 3 has more dust particles of class 3 or below. It was confirmed that [pieces/m ³ ] was small. That is, it was confirmed that the dust could be quickly discharged outside the guide 3 without making any deformation of the guide 3 such as making holes.

(Example 4)
In the local air purifying device 1 of FIG. 5, the position of the second laminar flow generator 42 was changed and the number of dust particles was measured at a plurality of measurement positions.

The push hood 2 of the local air purification device 1 and the method of measuring the cleanliness are the same as in the first embodiment. Further, as in Example 1, 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 particles generated from the device 6 was 5.0×10 ⁷ to 6.7×10 ⁷ [pieces/m ³ ].

Further, the second laminar flow generator 42 directs 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 at a flow rate of 11.7 mm. It blew out at 5 m/s.

The position of the second laminar flow generator 42 will be explained using FIGS. 11A to 11C. The second laminar flow generator 42 was placed 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 placed 1000 mm downstream from the upstream end of the first laminar flow generator 41. Specifically, the arrangement was such that the laminar flow 42 a of the second laminar flow generation device 42 was blown out from a position 1000 mm downstream from the upstream end of the first laminar flow generation device 41 . Second, as shown in FIG. 11B, the second laminar flow generator 42 was placed directly above the first laminar flow generator 41. Specifically, 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 in the distance direction (x direction in FIG. 7). The third one was placed 1000 mm upstream from the upstream end of the first laminar flow generator 41, as shown in FIG. 11C. Specifically, the arrangement was such that the laminar flow 42 a of the second laminar flow generation device 42 was blown out from a position 1000 mm upstream from the upstream end of the first laminar flow generation device 41 .

In FIGS. 11A to 11C, the measurement positions of the number of dust particles [pieces/m ³ ] in the local air purifying device 1 were set to distance 1000 mm, depth 0 mm, height 400 mm, 800 mm, 1500 mm, and 2200 points. That is, the number of dust particles [pieces/m ³ ] was measured at a total of 12 measurement positions: 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 Example 1, the measurement results are shown in classes representing cleanliness according to ISO14644-1. The measurement results are shown in Table 5.

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

As shown in Table 5, at heights of 800 mm and 400 mm, the highest cleanliness is exhibited when the second laminar flow generator 42 is placed downstream of the first laminar flow generator 41 (FIG. 11A). It was confirmed. This is thought to be because the laminar flow 42a of the second laminar flow generator 42 located directly above (FIG. 11B) and upstream (FIG. 11C) sweeps away the dust below the second laminar flow generator 42. It will be done.

(Example 5)
The number of dust particles was measured in the local air purifying device 1 having the first laminar flow generating device 41 with the suction port located at different positions.

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

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

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

At the above measurement position, the number of dust was measured when the outlet size of the first laminar flow generator 41 of FIGS. 12A to 12C was 25 mm, 50 mm, and 100 mm, and the blowing wind speed was 1 m/s to 6 m/s. As in Example 1, the measurement results are shown in classes representing cleanliness according to ISO14644-1. The measurement results are shown in Table 6.

In Table 6, "OFF" indicates that the first laminar flow generator 41 is not blowing out a laminar flow, and "ON" indicates that the first laminar flow generator 41 is blowing out a laminar flow. As shown in Table 6, among the conditions of downstream intake (Figure 12A), upstream intake (Figure 12B), and floor intake (Figure 12C), the laminar flow is blown out under the condition of upstream intake (Figure 12B). It was confirmed that the cleanliness was improved the most compared to the case without. In addition, under the condition that the intake position is on the upstream side (Figure 12B), the cleanliness is improved the most when the outlet size is 50 mm among 25 mm, 50 mm, and 100 mm, compared to when no laminar flow is blown out. It was confirmed that That is, it was confirmed that 50 mm is suitable for the outlet size. In addition, the highest cleanliness was confirmed under the conditions that the intake position was on the upstream side, the outlet size was 50 mm, and the outlet air speed was 4 m/s.

(Example 6)
Using the local air purifying device 1 equipped with the first laminar flow generator 41 with the suction port located on the upstream side, the number of dust particles was measured at a plurality of measurement positions at different distances and heights.

FIG. 13 is a side view of the local air purifying device 1 including the first laminar flow generating device 41 whose suction port is located on the upstream side.

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

As shown in FIG. 13, the distances from the downstream end of the first laminar flow generator 41 to the downstream side of the uniform airflow are 1000 mm, 2000 mm, and 3000 mm, and the heights from the floor are 800 mm and 1200 mm. The measurement position was defined as a position on a straight line passing through the centers of the first laminar flow generator 41 and the apparatus 6.

At the above measurement position, the number of dust particles was measured when the outlet size of the first laminar flow generator 41 in FIG. 13 was 50 mm and the outlet air speed was 2 m/s to 4 m/s. As in Example 1, the measurement results are shown in classes representing cleanliness according to ISO14644-1. The measurement results are shown in Table 7.

In Table 7, "OFF" indicates that the first laminar flow generator 41 is not blowing out a laminar flow, and "ON" indicates that the first laminar flow generator 41 is blowing out a laminar flow. As shown in Table 7, at heights of 800 mm and 1200 mm, the conditions where the wind speed is 4 m/s are better than the conditions where the wind speed is 2 m/s and 3 m/s, compared to the case where no laminar flow is blown out. It was confirmed that cleanliness improved. That is, it was confirmed that the blowing wind speed of the first laminar flow generator 41 is preferably 4 m/s.

(Example 7)
The wind speed inside the local air purifying device 1 was measured when the first laminar flow generating device 41 blew out a laminar flow.

The push hood 2 of the local air purifying device 1 shown in FIGS. 14A, 14B, 15A, and 15B has a push hood 2a with a width of 1050 mm and a length of 850 mm, with the air flow opening surfaces of the push hood 2a being in the same direction. They are arranged and connected (3 vertically x 5 horizontally, 15 pieces) so that the short sides and long sides are adjacent to each other, and the size of the opening surface 31 is 5250 mm in width and 2570 mm in height. be. The uniform air flow blown out from the push hood 2 flows at a flow rate of 0.3 m/s, forming a clean air space.

14A and 14B show a plan view and a side view of the local air purifying 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 41a. 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 sideways (in the y direction) are shown.

The table 5 is located at the center of the local air purifying device 1 in the y direction, and the first laminar flow generator 41 of FIGS. placed on the downstream side. As shown in FIGS. 14A and 14B, the center of the first laminar flow generator 41 that blows out a laminar flow upward and the center of the table 5 are located on the straight line 8. Further, as shown in FIGS. 15A and 15B, the first laminar flow generator 41 that blows out a laminar flow laterally 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, from the downstream end of the first laminar flow generator 41 in the uniform air flow to the downstream side of the uniform air flow ( Points at distances of 1000 mm, 2000 mm, and 3000 mm in the x direction were defined as measurement positions in the distance direction. Further, points at distances of -400 mm, 0 mm, and +400 mm from the straight line 8 in the y direction were taken as measurement positions in the depth direction. Further, as shown in FIG. 14B, points at heights of 400 mm, 800 mm, 1200 mm, and 1600 mm from the floor were taken as measurement positions in the height direction.

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

The wind speed [m/s] was measured at the above measurement position. Table 8 shows the measurement results for the first laminar flow generator 41 that blows out a laminar flow upward, and Table 9 shows the measurement results for the first laminar flow generator 41 that blows out a laminar flow sideways.

In Table 8, "upward airflow ON" indicates the case where the first laminar flow generation device 41 blows laminar flow upward, and "upward airflow OFF" indicates that the first laminar flow generation device 41 does not blow out laminar flow. Indicate the case. As shown in Table 8, it was confirmed that the wind speed distribution was within ±50% under the conditions of "upward airflow ON" and "upward airflow OFF". Furthermore, it was confirmed that there was almost no difference in airflow distribution between the conditions of "upward airflow ON" and the "upward airflow OFF" condition.

In Table 9, "sideways airflow ON" indicates the case where the first laminar flow generator 41 blows out laminar flow sideways, and "sideways airflow OFF" indicates that the first laminar flow generator 41 does not blow out laminar flow. Indicate 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". Furthermore, it was confirmed that there was almost no difference in airflow distribution between the conditions of "sideways airflow ON" and "sideways airflow OFF".

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.

Note that various embodiments and modifications of the present invention are possible without departing from the broad spirit and scope of the present invention. Moreover, the embodiments described above 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 indicated by the claims rather than the embodiments. Various modifications made within the scope of the claims and the meaning 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 August 24, 2018. The entire specification, claims, and drawings of Japanese Patent Application No. 2018-157443 are incorporated herein by reference.

According to the present invention, there is provided a local air purification device that can maintain a high degree of cleanliness in the work space where work is actually being performed by moving dust generated by work in the clean air space to outside the work space. can be provided.

1 Local air cleaning device 2, 2a Push hood 21 Housing 22 Air flow suction surface 23 Air blowing surface (air flow opening surface)
24 Air blowing mechanism 25 High performance filter 26 Rectification 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 Device 7, 8 Straight line W Air collision surface

Claims (5)

a push hood having an airflow opening surface that blows out a purified uniform airflow;
a guide provided on the airflow opening side of the push hood, extending from the airflow opening side toward the downstream side of the uniform airflow, and forming an opening surface at the downstream end;
The push hood is arranged such that the purified uniform air flow blown out from the airflow opening passes through the guide and then impinges on an air impingement surface on the downstream side of the opening of the guide. and forming an open area between the opening surface of the guide and the air collision surface by arranging the opening surface of the guide away from and facing 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 area, thereby causing the inside of the guide and the open area to flow into other areas. In a local air purification device that provides a high degree of cleanliness compared to the area,
The guide is disposed downstream of a position where dust is generated, has a width corresponding to the width of the dust generation source, and has a width relative to the direction in which the uniform airflow is blown out from the airflow opening surface. comprising a first laminar flow generator that blows out a laminar flow in a substantially orthogonal direction;
The first laminar flow generating device moves dust generated within the guide to a peripheral edge within the guide by a laminar flow blown out in the substantially orthogonal direction;
The push hood is characterized in that the dust moved to the periphery of the guide by the first laminar flow generator is discharged to the outside of the guide by a uniform air flow blown out from the air flow opening surface. Air purification device. a push hood having an airflow opening surface that blows out a purified uniform airflow;
a guide provided on the airflow opening side of the push hood, extending from the airflow opening side toward the downstream side of the uniform airflow, and forming an opening surface at the downstream end;
The push hood is arranged such that the purified uniform air flow blown out from the airflow opening passes through the guide and then impinges on an air impingement surface on the downstream side of the opening of the guide. and forming an open area between the opening surface of the guide and the air collision surface by arranging the opening surface of the guide away from and facing 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 area, thereby causing the inside of the guide and the open area to flow into other areas. In a local air purification device that provides a high degree of cleanliness compared to the area,
The guide is disposed downstream of a position where dust is generated, has a width corresponding to the width of the dust generation source, and has a width relative to the direction in which the uniform airflow is blown out from the airflow opening surface. comprising a first laminar flow generator that blows out a laminar flow in a substantially orthogonal direction;
A hole is formed in the guide at a position where the laminar flow blown out from the first laminar flow generator collides with the guide,
The local air purifying device is characterized in that the first laminar flow generating device discharges dust generated within the guide to the outside of the guide through the hole using a laminar flow blown out in the substantially orthogonal direction. located at a peripheral edge within the guide at a position close to a position where the laminar flow blown out from the first laminar flow generation device collides with the guide and downstream of the first laminar flow generation device; further comprising a second laminar flow generator that blows out a laminar flow toward the opening surface substantially parallel to the direction in which the uniform airflow is blown out from the airflow opening surface,
The second laminar flow generator blows out a laminar flow in the substantially parallel direction at a flow rate faster than the flow rate of the uniform air flow,
A claim characterized in that the second laminar flow generator discharges the dust moved to the periphery of the guide by the first laminar flow generator to the outside of the guide by the laminar flow blown out substantially in parallel. Item 1. The local air purification device according to item 1. Claims 1 to 3, wherein the flow velocity of the laminar flow blown out by the first laminar flow generator in the substantially orthogonal direction is 3 to 25 times the flow velocity of the uniform air flow blown out by the push hood. The local air purification device according to any one of the above. 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 air flow. Purification equipment.

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