HK1197930A - Local air purification device - Google Patents

Abstract

A local air purification device (1) is equipped with: a push hood (2) having an airflow opening surface (23) which discharges a purified uniform flow of air; and a guide (3), which is provided on the airflow opening surface (23) side of the push hood (2), and which extends from the airflow opening surface (23) side toward the downstream side of the uniform flow of air and forms an opening surface (31) at the downstream end. The push hood (2) is arranged such that the uniform flow of air discharged from the airflow opening surface (23) passes through the interior of the guide (3) and then collides with an air collision surface (W) downstream from the opening surface (31). With the guide (3) an open region is formed between the opening surface (31) and the air collision surface (W) by arranging the opening surface (31) at a distance from and facing the air collision surface (W). The purified uniform flow of air discharged from the airflow opening surface (23) collides with the air collision surface (W) and flows to the outside of the open region, and thus the interior of the guide (3) and the interior of the open region have higher purity than other regions.

Description

Local air cleaning device

Technical Field

The present invention relates to a local air cleaning device.

Background

Conventionally, a clean bench has been often used as a device for improving the air cleanliness of a local work space. In a general clean bench, a working opening is formed only on the front surface of the bench, and the other surfaces are surrounded to maintain cleanliness. Such a clean air blowing port is disposed in an area surrounded by the clean air blowing port, and an operator performs work by inserting his/her hand from the work opening in the front.

However, since the work opening of the clean bench is narrow, the workability is problematic when the worker performs the assembly work of the precision machine. In addition, when the movement of products and manufacturing parts is accompanied like in a manufacturing line, the whole manufacturing line is put into a clean room, but there is a problem that the equipment is large in scale.

Therefore, a local air cleaning device has been proposed (patent document 1) in which air flow opening surfaces of a pair of exhaust hoods capable of blowing a uniform flow of cleaned air are arranged to face each other, and air flows from the air flow opening surfaces collide with each other, so that a region between the pair of exhaust hoods becomes a clean air space having a higher degree of cleanliness than other regions.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2008-275266

Disclosure of Invention

Problems to be solved by the invention

There are cases where work is performed in a wider clean space according to the kind of work and the flow of work. In addition, the local air cleaning device having a simpler structure may be used to perform the work. Therefore, a local air cleaning device having a simpler structure is desired.

In view of the above problems, an object of the present invention is to provide a local air cleaning device having a simple structure.

Means for solving the problems

In order to achieve the above object, a local air cleaning device according to the present invention includes a hood (push hood) having an air flow opening surface for blowing a cleaned uniform air flow, and a guide plate provided on an air flow opening surface side of the hood, extending from the air flow opening surface side toward a downstream side of the uniform air flow, and having an opening surface formed at a downstream side end portion, wherein,

the hood is configured to cause a cleaned uniform air flow blown from the air flow opening surface to collide with an air collision surface on a downstream side of the opening surface of the guide plate after passing through the guide plate,

forming an open area between the opening surface of the guide plate and the air collision surface by separating and facing the opening surface of the guide plate and the air collision surface;

the cleaned uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open area, so that the cleanliness in the guide plate and in the open area is higher than that in other areas.

Preferably, the opening surface of the guide plate and the air flow opening surface of the exhaust hood have substantially the same shape.

The exhaust hood is formed by connecting a plurality of exhaust hoods, for example.

The flow velocity of the cleaned uniform air flow blown out from the air flow opening surface is preferably 0.2 to 0.5 m/s.

Wherein the width of the opening surface of the guide plate is, for example, 2m or more and less than 10 m. In this case, the distance between the opening surface of the guide plate and the air collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 4 seconds.

Wherein the width of the opening surface of the guide plate is, for example, 1m or more and less than 2 m. In this case, the distance between the opening surface of the guide plate and the air collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 3 seconds.

Wherein the width of the opening surface of the guide plate is, for example, 0.2m or more and less than 1 m. In this case, the distance between the opening surface of the guide plate and the air collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 2 seconds.

Preferably, the air collision surface has a bent portion bent toward the guide plate near a position facing an end of the opening surface of the guide plate.

In such a local air cleaning device, the width of the opening surface of the guide plate is preferably 2m or more and less than 10m, and the distance between the opening surface of the guide plate and the collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 6 seconds.

Further, the width of the opening surface of the guide plate is preferably 1m or more and less than 2m, and the distance between the opening surface of the guide plate and the collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 5 seconds.

Further, the width of the opening surface of the guide plate is preferably 0.2m or more and less than 1m, and the distance between the opening surface of the guide plate and the collision surface is preferably a distance at which a uniform air flow blown out from the opening surface collides with the air collision surface within 3 seconds.

Effects of the invention

According to the present invention, a local air cleaning device having a simple structure can be provided.

Drawings

FIG. 1 is a schematic view showing a local air cleaning apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view showing the configuration of a hood;

FIG. 3 is a diagram showing other examples of the local air cleaning apparatus;

FIG. 4 is a schematic view illustrating the direction of flow of a cleaned uniform air stream;

FIG. 5 is a diagram showing other examples of the local air cleaning apparatus;

FIG. 6 is a diagram showing other examples of the local air cleaning apparatus;

FIG. 7 is a schematic view illustrating the width of the opening face of the guide plate;

FIG. 8 is a schematic view showing a local air cleaning apparatus according to another embodiment;

FIG. 9 is a schematic view showing a local air cleaning apparatus according to another embodiment;

FIG. 10 is a schematic view showing a local air cleaning apparatus according to another embodiment;

FIG. 11 is a schematic view showing a local air cleaning apparatus according to another embodiment;

FIG. 12 is a schematic view showing a measurement position of example 1;

FIG. 13 is a schematic diagram showing conditions of examples 2 to 10;

FIG. 14 is a schematic view showing the measurement positions of examples 2 to 9;

FIG. 15 is a schematic view showing the conditions of examples 11 to 19, reference examples 1 to 9;

FIG. 16 is a schematic view showing the local air-cleaning apparatus of examples 20 and 21 and reference examples 10 and 11 and the measurement position; and

FIG. 17 is a schematic view showing a local air cleaning apparatus and conditions in examples 20 and 21 and reference examples 10 and 11

The reference numbers illustrate:

1. exhaust hood of local air cleaning device 2, 2a

3. Guide plate 21, housing

22. Airflow suction surface 23 and airflow discharge surface (airflow opening surface)

24. Air supply mechanism 25, high performance filter

26. Rectifying mechanism 27 and prefilter

31. Opening surface L and width of opening surface

W: air rushing surface

Detailed Description

The local air cleaning apparatus of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a schematic view showing an example of a local air cleaning apparatus of an embodiment of the present invention.

As shown in fig. 1, the local air cleaning apparatus 1 of the present invention includes a hood 2 disposed to face an air impingement surface W of a wall, a partition plate, or the like, and a guide plate 3 provided to the hood 2.

The hood 2 may be any one having a mechanism for blowing a clean uniform air flow, and may be a hood used in a conventional blow-and-suction type ventilation apparatus as a basic mechanism and provided with a cleaning filter structure.

The uniform air flow and the uniform flow described herein are defined as the same as the uniform flow described in "factory ventilation" (published by the society for air conditioning and health care, 1982) of the woodtaro, and are uniformly and continuously flowing at a gentle wind speed without generating a large vortex. However, the present invention does not provide an air blowing device in which the flow velocity and velocity distribution of air are strictly defined. It is preferable that the velocity distribution of the uniform air flow in a state where, for example, no obstacle is present is within ± 50% of the average value thereof, and further within ± 30%.

The hood 2 of the present embodiment is connected to 9 (longitudinal 3 × transverse 3) hoods respectively by connectors, the airflow opening surfaces of the 9 hoods are in the same direction, and the long sides of the short sides of the hoods are arranged adjacently. Here, since the structures of the hoods connected by the connector are basically the same, the structure of the hood 2 of the present embodiment will be described by describing the structure of one of the hoods 2 a. Fig. 2 shows the configuration of the hood 2 a.

As shown in fig. 2, the casing 21 of the 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 formed of, for example, a surface of the casing 21 having a plurality of holes formed on the entire surface thereof. The air flow suction surface 22 sucks peripheral air, i.e., outdoor air or indoor air, outside the hood 2a from the holes. An air blowing surface (air flow opening surface) 23 is formed on the other surface of the housing 21 facing the air flow suction surface 22. The air flow opening surface 23 is formed by, for example, a surface having a plurality of holes formed on the entire surface of the casing 21. The airflow opening surface 23 blows out a uniform airflow of the clean air formed inside the hood 2a from the hole to the outside of the hood 2 a. The size of the air flow opening surface 23 of the hood 2a is not particularly limited, and is, for example, 1050mm × 850 mm.

The hood 2 is disposed so that the air flow opening surface 23 faces an air collision surface W such as a wall. Here, the state in which the air flow opening surface 23 and the air collision surface W face each other is not limited to the state in which the air flow opening surface 23 and the air collision surface W face each other, and includes, for example, a state in which the air flow opening surface 23 of the hood 2 and the air collision surface W are inclined to a certain degree as shown in fig. 3. The inclination formed by the air flow opening surface 23 of the hood 2 and the air collision surface W is preferably such that the angle formed by the air flow opening surface 23 and the air collision surface W is within about 30 °.

The casing 21 is provided therein with an air blowing mechanism 24, a high-performance filter 25, and a rectifying mechanism 26.

The blower mechanism 24 is disposed on the air flow intake surface 22 side in the casing 21. The air blowing mechanism 24 is constituted by a fan for sucking air, and the like. The air blowing mechanism 24 blows an air flow from the air flow blowing surface 23 while introducing outdoor air or indoor air, which is peripheral air of the hood 2a, from the air flow suction surface 22. The air blowing mechanism 24 is configured to be able to change the flow velocity of the air flow blown out from the air flow opening surface 23 by controlling the suction force of the fan.

The high-performance filter 25 is disposed between the air blowing mechanism 24 and the rectifying mechanism 26. The high-performance filter 25 is formed of a high-performance filter corresponding to a cleaning grade for filtering the introduced ambient air, such as a HEPA filter (high efficiency air filter) or an ULPA filter (ultra low penetration air filter). The high-performance filter 25 cleans the peripheral air introduced by the air blowing mechanism 24 into clean air of a desired level of cleanliness. The clean air obtained by the high-performance filter 25 and cleaned to a desired level of cleanliness is sent to the flow straightening mechanism 26 through the air blowing mechanism 24.

The flow straightening mechanism 26 is disposed between the high-performance filter 25 and the airflow opening surface 23. The rectifying mechanism 26 includes an air resisting body, not shown, and is formed of a punching plate, a net member, or the like. The flow regulating mechanism 26 corrects (regulates) the feed air fed from the high-performance filter 25 with a deviation from the total ventilation amount of the airflow opening surface 23 into a uniform airflow (uniform airflow) with no deviation from the total ventilation amount of the airflow opening surface 23. The rectified uniform air flow is blown out of the entire air flow opening surface 23 to the outside of the hood 2 by the air blowing mechanism 24.

As shown in fig. 2, in the hood 2a, a pre-filter 27 is preferably disposed between the air flow suction surface 22 and the air blowing mechanism 24 in the casing 21. The pre-filter 27 is, for example, a medium performance filter. By disposing the pre-filter 27 between the air intake surface 22 and the air blowing mechanism 24, it is possible to remove large dust contained in the peripheral air sucked into the casing 21 through the air intake surface 22. This makes it possible to remove dust in multiple stages according to the size of dust contained in the ambient air, and to maintain the performance of the high-performance filter 25, which is likely to be clogged, for a long period of time.

In the hood 2a configured as described above, the peripheral air introduced by the air blowing means 24 is cleaned by the pre-filter 27 and the high performance filter 25 to clean air of a desired level of cleanliness. The cleaned clean air is rectified into a uniform air flow by the rectifying mechanism 26. The thus cleaned uniform air flow is blown out from the entire air flow opening surface 23 of the hood 2a in a direction almost perpendicular to the air flow opening surface 23.

One end of the guide plate 3 is disposed on the air flow opening surface 23 side of the hood 2. The guide plate 3 is formed to extend from the air flow opening surface 23 to the downstream side of the uniform air flow blown out from the air flow opening surface 23, and to cover the outer peripheral contour portion of the air flow opening surface 23. For example, when the airflow opening surface 23 is a square, the cross-sectional shape thereof extends like "コ". The open side and the bottom surface of the コ shape form a state surrounding the airflow in a tunnel shape parallel to the flow of the uniform airflow blown out therefrom, including an outer peripheral contour portion facing the blowing direction of the uniform airflow. In the case of no bottom surface, the cross-sectional shape of the guide plate 3 may be formed to extend in a □ shape instead of the コ shape. The guide plates 3 are formed to have an open area with the respective other ends (opening surfaces 31). Here, the opening surface 31 of the guide plate 3 is a hollow end surface, i.e., an opening, surrounded by a peripheral outline portion of a downstream side end portion (a boundary with the open area) of the guide plate 3 extending in a tunnel shape toward a downstream side of the uniform air flow blown out from the air flow opening surface 23. For example, when the floor surface is used as a part of the guide plate 3, when the cross-sectional shape of the guide plate 3 is コ, the opening of the rectangular hollow formed by the downstream side end of the guide plate 3 and the floor surface is the opening surface 31, and when the cross-sectional shape of the guide plate 3 is □, the opening of the rectangular hollow formed by the downstream side end of the guide plate 3 is the opening surface 31.

The guide plate 3 may be made of any material as long as the air flow blown out from the opening surface 31 of the guide plate 3 can be maintained in a clean, uniform air flow from the air flow opening surface 23. Further, if the guide plate 3 can maintain the cleaned uniform air flow from the air flow opening surface 23, the entire periphery of the uniform air flow may not be covered, and for example, a part thereof may be perforated to form a slit.

The guide plate 3 is disposed such that the opening surface 31 faces the air collision surface W. By disposing the opening surface 31 to face the air collision surface W, the air flow blown out from the opening surface 31 collides with the air collision surface W. When the uniform air flow collides with the air collision surface W with the opening surface 31 facing the wall as shown in fig. 4, the behavior of changing to the almost vertical flow direction is shown. By this flow, the air flow colliding with the air collision surface W flows out to the outside of the collision surface. As a result, a clean space is available for the air flow from the collision surface into the end region of the opening surface 31.

Here, the opening surface 31 facing the air collision surface W means: the state where the opening surface 3 faces the air collision surface W is not limited, and for example, as shown in fig. 3, the state where the opening surface 31 of the guide plate 3 is inclined to the air collision surface W is included. Even if the air flow blown out from the opening surface 31 does not collide with the air collision surface W from the front, a clean space can be formed in the space surrounded by the dotted line in fig. 3. The angle formed by the opening surface 31 of the guide plate 3 and the air collision surface W is preferably within about 30 °.

The shape of the opening surface 31 is preferably formed to be almost the same as the air flow opening surface 23. Since the opening surface 31 and the airflow opening surface 23 have almost the same shape, the uniform airflow state blown out from the airflow opening surface 23 can be easily maintained at the opening surface 31. However, the opening surface 31 and the air flow opening surface 23 may not have substantially the same shape, and for example, as shown in fig. 5 and 6, the width of the opening surface 31 may be increased or decreased so that the opening surface 31 and the air flow opening surface 23 have different shapes. Since the state of uniform air flow can be maintained also in this case. In the case of expanding or contracting the width of the opening face 31, (the width of the opening face 31)/(the width of the air flow opening face 23) is preferably 0.6 to 1.4, more preferably 0.8 to 1.2. By setting the air flow rate within this range, the state of the uniform air flow blown out from the air flow opening surface 23 can be maintained at the opening surface 31.

The length b of the guide plate 3 may be a length that can form an open area between the opening surface 31 of the guide plate 3 and the air collision surface W when the opening surface 31 is spaced apart from and opposed to the air collision surface W. It is preferable to set the predetermined length in accordance with the interval X between the air flow opening surface 23 and the air collision surface W of the hood 2, the flow velocity of the uniform air flow blown out from the air flow opening surface 23 (opening surface 31), and the like.

As described later, when the length b of the guide plate 3 is set to 12m and the width of the opening surface 31 is set to 2m or more and less than 10m, it is preferable that the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W is set to be within 4 times the flow velocity (the distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 4 seconds). When the width of the opening surface 31 is 1m or more and less than 2m, it is preferable that the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W is within 3 times the flow velocity (the distance within 3 seconds at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W). Further, when the width of the opening surface 31 is 0.2m or more and less than 10, it is preferable that the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W is set to be within 2 times the flow velocity (the distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 2 seconds). By setting such a distance, the opening area inside the guide plate 3 and between the opening surface 31 and the air collision surface W can be made highly clean.

Here, the width (L) of the opening surface 31 means the diameter of a circle as shown in fig. 7 (a) when the opening surface 31 is circular. The width (L) of the opening surface 31 is, when the opening surface 31 is rectangular, the diameter of the maximum inscribed circle as shown in fig. 7 (b), that is, the length of the short side. The width (L) of the opening surface 31 is the diameter of the largest inscribed circle as shown in FIGS. 7 (c) to (g) when the opening surface 31 is elliptical or polygonal. In addition, the width (L) of the opening surface 31 when the opening surface 3 includes the concave portion is the diameter of the inscribed circle in which the distance between the facing sides is the shortest as shown in fig. 7 (h). The width (L) of the opening surface 31 is the diameter of an inscribed circle in which the distance between the side having the concave portion and the opposite side becomes the shortest distance as shown in fig. 7 (i) in the case where the opening surface is concave.

As shown in fig. 1, the guide plate 3 thus configured is disposed (mounted) so as to face the downstream side of the uniform air flow from the air flow opening surface 23 side of the hood 2, and is disposed so that an opening surface 31 provided at the downstream side end thereof faces the air collision surface W. Here, an open area is formed between the opening surface 3 and the air collision surface W.

In the local air cleaning apparatus 1 configured as described above, the peripheral air in the vicinity of the air flow intake surface 22 obtained by the air blowing mechanism 24 of the hood 2 is cleaned to a desired level of cleanliness via the pre-filter 27 and the high-performance filter 25. Then, the cleaned and cleaned clean air is rectified into a uniform air flow by the rectifying mechanism 26, and the cleaned and uniform air flow is entirely blown out from the air flow opening surface 23 to the guide plate 3.

Here, the flow velocity of the cleaned uniform air flow blown out from the air flow opening surface 23 is preferably 0.3 to 0.5 m/s. When the wind speed is reduced to 0.2 to 0.3m/s in order to suppress power consumption, the inside of the local air cleaning apparatus 1 is contaminated, and when rapid cleaning is desired, the wind speed can be increased to 0.5 to 0.7m/s by appropriate selection. When the air is blown at such an equal flow rate, the cleaned uniform air flow blown from the air flow opening surface 23 is pushed into the guide plate 3 and moves, and the uniform air flow state is easily maintained in the guide plate 3. Further, when the flow rate is decreased, the number of rotations of the fan of the blowing mechanism is suppressed, and thus the noise value and the power consumption can be suppressed. As the amount of air blown decreases, the amount of dust accumulated in the pre-filter 27 and the high-performance filter 25 can be reduced. On the other hand, when contaminants are generated in the cleaning space of the guide plate 3, setting the flow velocity of the uniform air flow to about 0.5m/s makes it possible to more rapidly remove the contaminants in the guide plate 3 and in the open area formed between the guide plate 3 and the air collision surface W than when setting the flow velocity of the uniform air flow to 0.2 m/s. Thus, the flow rate of the uniform air flow can be freely set according to the use application. Further, if the wind speed of the uniform air flow blown out from the air flow opening surface 23 is excessively increased, a vortex portion is generated, and a turbulent flow is generated when the uniform air flow is blown out from the opening surface 31, and there is a possibility that contaminants outside the opening area are caught in the opening area formed between the guide plate 3 and the air collision surface W. Therefore, it is preferable that the speed of the uniform air flow blown out from the air flow opening surface 23 is set to a speed at which no vortex portion is generated.

The cleaned uniform air flow blown out from the guide plate 3 passes through the guide plate 3 while maintaining a uniform air flow, and is blown out from the opening surface 31. The air flow blown out from the opening surface 31 collides with the air collision surface W. The conflicting air flows out of the open area formed between the guide plate 3 and the air conflicting surface W (outside the local air cleaning device 1). As a result, the cleanliness of the area between the air flow opening surface 23 and the air collision surface W (the inside of the guide plate 3, and the open area between the opening surface 31 and the air collision surface W) is higher than the cleanliness of the area other than the local air cleaning device 1.

Here, the present invention is compared with the local air cleaning device described in patent document 1. In comparison, the hoods of the two devices are set to connect 9 (3 pieces in the vertical direction × 3 pieces in the horizontal direction) hoods whose opening areas for air flow are set to 1050mm in the horizontal direction × 850mm in the vertical direction. Further, the flow velocity of the cleaned uniform air flow blown out from the air flow opening surface was set to 0.5 m/s. Here, it is confirmed that the upper limit of the distance between the air flow opening surface 23 and the space to be cleaned in the local air cleaning apparatus described in patent document 1 is about 5.5 m. In contrast, it was confirmed that in the local air cleaning apparatus 1 of the present invention, the distance between the air flow opening surface 23 and the air collision surface W in the cleaning space is as wide as about 20 m. As described above, the local air cleaning device 1 of the present invention has a simple structure and can form a wide cleaning space.

In addition, in the case where the present invention is compared with the open type air cleaning apparatus using the technology described in patent document 1, a relatively wide cleaning space can be obtained even if the wind speed of the uniform air flow blown out from the exhaust hoods having the same area is the same, and the power consumption of the exhaust hoods alone can be reduced even if the power consumption is the same on both sides because the apparatus is not required. Alternatively, when the same cleaning space is cleaned, the wind speed can be reduced more than in patent document 1, and therefore the number of rotations of the fan of the air blowing mechanism can be suppressed, and power consumption can be reduced. Further, since the wind speed can be reduced, the noise generated by the operation of the local air cleaning device can be reduced, and since the amount of air passing through the filter is reduced, the amount of dust accumulated on the filter for obtaining clean air can be reduced, and the degree of consumption can be suppressed. When the open type local air cleaning system of patent document 1 was installed under the above-described conditions, it was confirmed that the power consumption amount was 7200W and the noise value at the center between the air flow opening surfaces 23 arranged to face each other was 75db (a). On the other hand, when the present invention is set under the above-described condition (distance 20m between air flow opening surface 23 and air collision surface W), it is confirmed that power consumption amount is 3600W, and the noise value is the same as the noise value level of patent document 1 at the center between air flow opening surface 23 and air collision surface W. In other words, in patent document 1, a space of about 45 cubic meters is cleaned, and the power consumption for cleaning 1 cubic meter is about 160W. In contrast, the present invention cleans a space of about 166 cubic meters, and the power consumption for cleaning 1 cubic meter is about 22.5W. In the present invention, the distance between the air flow opening surface 23 and the air collision surface W is 20m, and when this distance is increased, the power consumption per unit volume can be further reduced.

Further, in a general clean room, it is not easy to perform a construction work for cleaning the whole room, and in the local air cleaning apparatus 1 of the present embodiment, the hood 2 can be easily moved. In addition, the guide plate 3 provided in the hood 2 may be curved in accordance with the work within a range not affecting the uniform air flow, or the open area formed by the opening surface of the guide plate and the air-collision surface may be moved to any position, and so on, so that the arrangement in the work field is very easily changed.

In addition, when the operator himself/herself enters and exits a general clean room for work in a clean area, the work area of the operator does not change regardless of the extension of the distance between the bottom surface on which the operator works and the ceiling on which the clean air blowing device is mounted. However, since the horizontal flow is used in the local air cleaning apparatus 1, the area in the guide plate 3 is increased, and the working area (floor area) of the worker who works in the cleaning area can be increased by the whole body.

In addition, in the open area of the present embodiment, there is no door for the entry and exit of an operator, a component, or a manufacturing machine, which is required for a general clean room, and the door can be opened to allow the entry and exit of the open area or the entry and exit of the component as needed without reducing the cleanliness in the clean space area. When a general clean room is contaminated, the contaminated air in the clean room is diluted by the clean air supplied to the clean room, and the clean room is slowly cleaned by the exhaust air. Therefore, in the case where the clean room is contaminated, it takes several hours to clean, but in the present invention, even if the inside of the guide plate 3 and the inside of the open area are assumed to be contaminated, the contaminated air is pushed out from the inside of the guide plate by the cleaned uniform air flow blown from the air flow opening surface, and flows outside the guide plate, so that the cleaning can be performed in an extremely short time.

In general clean rooms, clean air supplied to the clean room is discharged from an exhaust port provided in the clean room or from a gap formed between a wall surface of the clean room and a floor surface. This is because the gap is minimized in a general clean room, and the outside polluted air is prevented from entering by making the pressure in the clean room positive. However, in the present invention, unlike the discharge of the purified air between the fine slits of the purification chamber, an open area having a larger width is actively formed, and thus the space formed therein can be cleaned. Therefore, the space formed by it can be cleaned. Therefore, the open area can be used as a clean area for the above-described entrance and exit.

As described above, according to the local air cleaning device of the present embodiment, the cleaning degree of the inside of the guide plate 3 and the open area between the opening surface 31 and the air collision surface W can be made higher than the cleaning degree of the area other than the local air cleaning device 1 by disposing the hood provided with the guide plate 3 so as to face the air collision surface W. Thus, the present invention can provide the local air cleaning device 1 having a simple structure.

The present invention is not limited to the above embodiment, and various modifications and applications are possible. Other embodiments applicable to the present invention will be described below.

In the above embodiment, the present invention has been described by taking as an example the case where the shape of the guide plate 3 provided in the hood 2 is designed to extend straight from the air flow opening surface 23 of the hood 2 to the opening surface 31 of the guide plate, but may be curved as long as the uniform air flow is maintained, as shown in fig. 8, for example. In this case, the inside of the guide plate 3 and the open area between the open surface 31 and the air collision surface W may be made to have higher cleanliness than the area outside the local air cleaning device 1, thereby forming a large clean air space.

In the above embodiment, the present invention has been described by taking an example in which the hood 2 is connected to 9 (3 pieces in the longitudinal direction × 3 pieces in the transverse direction) hoods 2a by connectors, but the number of hoods 2a constituting the hood 2 may be 10 or more, or 8 or less. For example, the hood 2 may be connected to 4 (2 pieces in the longitudinal direction × 2 pieces in the transverse direction) hoods 2a by connectors. When the hoods 2a are connected in this way, the airflow opening surfaces of the hoods 2a are in the same direction, and the short sides and the long sides of the hoods 2a are arranged adjacent to each other. In this case, it is preferable that the side surfaces of the adjacent hoods 2a are connected to each other in a sealed state, or the upper and lower surfaces or the surfaces are connected to each other in a sealed state, by a sealing material such as a packing. In addition, as shown in fig. 9, the hood 2 may be constituted by 1 hood 2 a. In these cases, the open area inside the guide plate 3 and between the open surface 31 and the air collision surface W can be made to have higher cleanliness than the area outside the local air cleaning device 1, whereby the local air cleaning device 1 having a simpler structure can be provided. In the local air cleaning device 1, the bottom surface may not be used as one surface of the guide plate 3, and the cross-sectional shape of the guide plate 3 may be □.

In the above embodiment, the present invention has been described by taking as an example the case where the open area between the opening surface 31 and the air collision surface W is open on the upper surface and both side surfaces are open, but as shown in fig. 10, the end portion of the upper surface of the guide plate 3 may be connected to the air collision surface W, and the open area may be formed only on both side surfaces. In this case, the area between the air flow opening surface 23 and the air collision surface W can be made to have a higher degree of cleanliness than the area outside the local air cleaning device 1, and the local air cleaning device 1 having a simple structure can be provided.

In the above-described embodiments, the present invention has been described taking the case where the air collision surface W is a flat plate such as a wall or a partition plate as an example, but the air collision surface W is not limited to a flat plate. For example, the air impingement surface W is preferably: as shown in fig. 11, a bent portion W1 bent toward the guide plate 3 (hood 2) side is provided at the end of the air collision surface W near the position facing the end of the opening surface 31 of the guide plate 3, and at the side of the air collision surface W. The air collision surface W may have a curved portion W1 in which all of the upper, lower, and side portions are curved toward the guide plate 3. The curved portion W1 may have a smooth curved surface, so that the square corners are rounded (rounded). By providing the air collision surface W with the curved portion W1, it becomes easy to prevent air from flowing in from outside the open area formed between the guide plate 3 and the air collision surface W (outside the local air cleaning apparatus 1). Therefore, the cleanliness of the area between the air flow opening surface 23 and the air collision surface W (the open area inside the guide plate 3 and between the opening surface 31 and the air collision surface W) can be made higher than the cleanliness of the area other than the local air cleaning device 1, and thus the local air cleaning device 1 having a simple structure can be provided. Further, since the distance between the opening surface 31 and the air collision surface W and the shortest distance between the end of the opening surface 31 and the bent portion W1 are increased, a larger clean air space can be further formed.

The hood 2 may be configured to have casters attached to the bottom thereof. In this case, the hood 2 can be easily moved. The guide plate 3 may be a divided unit with casters, may be freely attached to the shape of the hood 2, and may be formed by covering the unit with a plastic sheet. In this case, the construction is easy and the movement is easy. Further, the guide plate 3 may be formed in a bellows-like plastic shed shape which is stretchable in the air flow direction. In this case, the length of the guide plate 3 can be easily changed, the guide plate 3 is bent, and the position of the guide plate 3, that is, the position where the cleaning space is obtained can be changed.

For example, when a clean room is formed in a corner of a room, a side wall or a floor is substituted for a part of the guide plate 3.

When a part of the conveyor-like conveyance line is disposed in the cleaning space, the conveyor-like conveyance line is surrounded into a tunnel shape so as to cover the entire portion of the conveyance line to be cleaned, one end of the surrounded portion is continuously connected to the exhaust hood 2, the other end is opened (opening surface 31), and an air collision surface W is disposed at a position opposite to the other end. In such an example, in the case where the transmission line is disposed along a wall, a wall may be used instead of a part of the guide plate 3.

Examples

Hereinafter, specific examples of the present invention will be given to further explain the present invention in detail.

(example 1)

The local air cleaning apparatus 1 shown in fig. 1 was used to measure cleanliness at measurement positions 1 to 15 (inside the guide plate 3, open area between the open surface 31 and the air collision surface W) shown in fig. 12. Fig. 12 is a plan view of the local air cleaning apparatus 1. The airflow opening surfaces of 9 exhaust hoods 2a (longitudinal 3 pieces × transverse 3 pieces) with transverse 1050mm and longitudinal 850mm are in the same direction, and the long sides of the short sides of the exhaust hoods are adjacently arranged and connected to form the exhaust hoods 2. The opening surface 31 has a width of 3150mm and a height of 2550 mm. The measuring positions 1-15 have a measuring height which is half the height of the hood 2. The cleanliness was measured by measuring the number of dusts having a particle diameter of 0.3um (unit: count/CF) using LASARI-II manufactured by PMS. The cleanliness is evaluated as high cleanliness when the number of particles is 300/CF or less. The length b of the guide plate 3 was 10m, the interval X between the air flow opening surface 23 of the hood 2 and the air collision surface W was 12m, and the flow velocity of the cleaned uniform air flow was 0.5 m/s. For reference, the cleanliness is also measured for the same measurement positions 16-18 outside the local air cleaning device 1. Table 1 shows the results.

TABLE 1

(example 1)

As shown in table 1, it was confirmed that the inside of the guide plate 3 and the open area between the opening surface 31 and the air collision surface W can be provided with a higher degree of cleanliness than the area outside the local air cleaning apparatus 1 by arranging the hood 2 provided with the guide plate 3 to face the air collision surface W. It can be confirmed that: the power consumption amount at this time was 3600W, and the noise value at the center of the air flow opening surface 23 and the air collision surface W was 75dB (A). It was confirmed that the local air cleaning device 1 having a simple structure can be provided thereby.

(examples 2 to 10)

With the local air cleaning device 1 shown in fig. 1, the cleanliness was measured while varying the flow rate of the cleaned uniform air flow, the length b of the guide plate 3, and the interval X between the air flow opening surface 23 of the hood 2 and the air collision surface W as shown in fig. 13. At this time, it was confirmed that the interior of the guide plate 3 was clean in example 1, and in examples 2 to 10, the cleanliness of the opening face 31 was measured at 7 points, i.e., at a position 15cm away from the air collision face W toward the opening face 31 side and at the center of the opening face 31 and the air collision face W, as shown in FIG. 14. Tables 2 to 10 show the results. The measurement point A, D, E is located 15cm downward from the upper edge of the downstream end of the guide plate 3 or the like, and 15cm inward of the air flow at the side edge of the downstream end of the guide plate. The measurement points B and F are located at the middle height between the upper and lower edges of the downstream end of the guide plate 3, and the side edge of the downstream end of the guide plate is located 15cm inward of the air flow. The measurement points C, G are located 15cm above the lower edge of the downstream side end of the guide plate 3, and 15cm inward of the air flow at the side edge of the downstream side end of the guide plate. The measurement points a to G on the air collision surface W side are 15cm upstream of the air flow from the air collision surface W.

TABLE 2

(example 2)

TABLE 3

(example 3)

TABLE 4

(example 4)

TABLE 5

(example 5)

TABLE 6

(example 6)

TABLE 7

(example 7)

TABLE 8

(example 8)

TABLE 9

(example 9)

Watch 10

(example 10)

As shown in table 2 to table 10, it was confirmed that: even if the flow rate of the cleaned uniform air flow, the length b of the guide plate 3, and the interval X between the air flow opening surface 23 of the hood 2 and the air collision surface W are changed, the open area inside the guide plate 3 and between the opening surface 31 and the air collision surface W can be made to have a higher degree of cleanliness than the area outside the local air cleaning device 1. It can be confirmed that the power consumption at this time is 1062-3600W and the noise value at the center of the air flow opening surface 23 and the air collision surface W is 59-75dB (A).

Examples 11 to 19, reference examples 1 to 9)

The local air cleaning apparatus 1 shown in FIG. 1 (exhaust hood 2a of 1050mm in the lateral direction and 850mm in the longitudinal direction: 3 in the longitudinal direction X3 in the lateral direction = 9) was used to measure the cleanliness with the guide plate 3 having the length b of 12m as shown in FIG. 15, for the case where the flow rate of the cleaned uniform air flow and the distance (X-b) between the opening face 31 of the guide plate 3 and the air collision face W were changed (examples 11-13, reference examples 1-3). In addition, cleanliness was measured in the same manner using the local air cleaning device 1 shown in FIG. 9 (exhaust hoods 2 a: 1 each having a transverse direction of 1050mm and a longitudinal direction of 850 mm) (examples 14 to 16, reference examples 4 to 6). Further, cleanliness was measured similarly using the local air cleaning device 1 (hood 2a of 1050mm in lateral direction and 850mm in longitudinal direction: 2 in longitudinal direction x 2 in lateral direction = 4) (examples 17 to 19, reference examples 7 to 9). The cleanliness was measured by measuring the number of dusts having a particle diameter of 0.3um (count/CF) using LASARI-II manufactured by PMS, and the case where the count was 300/CF or less was evaluated as high cleanliness (judged as ≈ C).

As shown in fig. 15, it was confirmed that the distance between the cleanable opening surface 31 and the air collision surface W can be increased by increasing the flow rate of the cleaned uniform air flow, increasing the number of the hoods 2a, and increasing the width (length of the short side) of the opening surface 31. Specifically, it was confirmed that the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W was set to: when the number of the exhaust hoods 2a is 9 (the width of the opening surface 31 is 2650 mm), the flow rate is within a distance of 3 to 4 times the flow rate (the distance within 3 to 4 seconds at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W), and high cleanliness can be obtained in which the opening area inside the guide plate 3 and between the opening surface 31 and the air collision surface W is 300/CF or less. Further, when the number of the hoods 2a is 4 (the width of the opening surface 31 is 1700 mm), a high degree of cleanliness of 300/CF or less in the open area between the opening surface 31 and the air collision surface W can be obtained by setting the flow rate to within 2.4 to 3 times the distance (the distance by which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 2.4 to 3 seconds) when the number of the hoods 2a is 1 (the width of the opening surface 31 is 850 mm), and by setting the flow rate to within 1.6 to 2 times the distance (the distance by which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 1.6 to 2 seconds) when the number of the hoods 2a is 1.

In the present embodiment and the reference example, 300 pieces/CF or less were evaluated as high cleanliness, but for example, 1000 pieces/CF or less were sufficient for evaluation as high cleanliness. In this case, it was confirmed that when the width of the opening surface is 2m or more and less than 10m, the opening area inside the guide plate 3 and between the opening surface 31 and the air collision surface W can be made highly clean by setting the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W to a distance within 4 times of the flow velocity (distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 4 seconds). It was also confirmed that the opening surface width was set to a distance of 3 times or less the flow velocity (distance at which the uniform air flow blown out from the opening surface 31 collided with the air collision surface W within 3 seconds) when the opening surface width was 1m or more and less than 2m, and was set to a distance of 2 times or less the flow velocity (distance at which the uniform air flow blown out from the opening surface 31 collided with the air collision surface W within 2 seconds) when the opening surface width was 0.2m or more and less than 1m, so that the inside of the guide plate 3 and the open region between the opening surface 31 and the air collision surface W could be made highly clean.

Examples 20 and 21, reference examples 10 and 11

The local air cleaning device 1 shown in fig. 16 (hood 2a having a transverse direction of 1050mm and a longitudinal direction of 850 mm: 3 pieces in the longitudinal direction X3 pieces in the transverse direction = 9) having a curved portion W1 curved toward the guide plate 3 (hood 2) side was used, and as shown in fig. 17, the length b of the guide plate 3 was set to 12m, and the cleanliness was measured for the case where the flow velocity of the cleaned uniform air flow was 0.5m/s (example 20, reference example 10) and 0.2m/s (example 21, reference example 11) and the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W was changed. The cleanliness was measured by measuring the number of dusts having a particle diameter of 0.3um (counts/CF) using LASARI-II manufactured by PMS. In addition, the cleanliness was measured at 7 points in total at the opening face 31, the position 15cm away from the air collision face W toward the opening face 31 side, and the measurement points A-G at the center of the opening face 31 and the air collision face W in FIG. 14 in the same manner as in examples 2 to 10. The results are shown in tables 11 to 14. TABLE 11

(example 20)

TABLE 12

(reference example 10)

Watch 13

(example 21)

TABLE 14

(reference example 11)

As shown in example 11, reference example 1, example 20, and reference example 10, it was confirmed that when the side portion of the air collision surface W was provided with the curved portion W1 curved toward the guide plate 3 (hood 2), the distance between the cleanable opening surface 31 and the air collision surface W was increased from 1.5m to 2m, and the shortest distance c between the end portion of the opening surface 31 and the curved portion W1 was also increased to 1.93 m. Further, as shown in example 13, reference example 3, example 21, and reference example 11, it was confirmed that the side portion of the air collision surface W was provided with the bent portion W1 bent toward the guide plate 3 (the hood 2) side, so that the distance between the cleanable opening surface 31 and the air collision surface W was increased from 0.8m to 1.2m, and the shortest distance c between the end portion of the opening surface 31 and the bent portion W1 was also increased to 1.16 m. It was confirmed that the curved portion W1 curved toward the guide plate 3 is provided on the side portion of the air collision surface W, and the local air cleaning device 1 having a simple structure can be provided, and a wider clean air space can be formed.

In the local air cleaning device 1 using the air collision surface W having the curved portion W1 (the number of the hoods 2a is 9 (the width of the opening surface 31 is 2650 mm)), it was confirmed that a high degree of cleanliness of 300/CF or less was obtained by setting the distance (X-b) between the opening surface 31 of the guide plate 3 and the air collision surface W to a distance of 6 times or less of the flow velocity (the distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 6 seconds).

In the local air cleaning apparatus 1 using the air collision surface W having the curved portion W1, when the number of the hoods 2a is 4 (the width of the opening surface 31 is 1700 mm), a distance equal to or less than 5 times the flow rate (a distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 5 seconds) is set, and when the number of the hoods 2a is 1 (the width of the opening surface 31 is 850 mm), a distance equal to or less than 3 times the flow rate (a distance at which the uniform air flow blown out from the opening surface 31 collides with the air collision surface W within 3 seconds) is set, and a high degree of cleanliness equal to or less than 300/CF can be obtained.

The application is based on Japanese patent application No. 2011-. The specification, claims and drawings of japanese patent application No. 2011-.

Claims (11)

1. A localized air cleansing apparatus, comprising:

exhaust hood having air flow opening surface for blowing cleaned uniform air flow, and

a guide plate provided on the side of the air flow opening surface of the hood, extending from the air flow opening surface side to the downstream side of the uniform air flow, and having an opening surface formed at the downstream end,

the exhaust hood is configured to be capable of making a clean uniform air flow blown from the air flow opening surface collide with an air collision surface on a downstream side of the opening surface of the guide plate after passing through the guide plate,

forming an open area between the opening surface of the guide plate and the air collision surface by facing the opening surface of the guide plate and the air collision surface in a spaced manner,

the cleaned uniform air flow blown out from the air flow opening surface collides with the air collision surface and flows out of the open area, so that the inside of the guide plate and the inside of the open area have a high degree of cleanliness as compared with other areas.

2. The localized air cleaning device according to claim 1, wherein the opening surface of the guide plate and the air flow opening surface of the exhaust hood have substantially the same shape.

3. The localized air cleaning device of claim 1 or 2, wherein the exhaust hood is comprised of a plurality of connected exhaust hoods.

4. The localized air cleaning device according to any one of claims 1 to 3, wherein a flow velocity of the cleaned uniform air flow blown out from the air flow opening surface is 0.2-0.5 m/s.

5. The localized air cleaning device according to any one of claims 1 to 4, wherein the width of the opening face of the guide plate is 2m or more and less than 10m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown out from the opening surface and the air collision surface within 4 seconds.

6. The localized air cleaning device according to any one of claims 1 to 4, wherein the width of the opening face of the guide plate is 1m or more and less than 2m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown out from the opening surface and the air collision surface within 3 seconds.

7. The localized air cleaning device according to any one of claims 1 to 4, wherein the width of the opening face of the guide plate is 0.2m or more and less than 1m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown out from the opening surface and the air collision surface within 2 seconds.

8. The localized air cleaning device according to any one of claims 1 to 4, wherein the air scouring surface has a curved portion that is curved toward the guide plate side in the vicinity of a position opposed to the open face end portion of the guide plate.

9. The localized air cleaning device according to claim 8, wherein the width of the opening surface of the guide plate is 2m or more and less than 10m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown by the opening surface and the air collision surface within 6 seconds.

10. The localized air cleaning device according to claim 8, wherein the width of the opening surface of the guide plate is 1m or more and less than 2m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown out from the opening surface and the air collision surface within 5 seconds.

11. The localized air cleaning device according to claim 8, wherein the width of the opening surface of the guide plate is 0.2m or more and less than 1m,

the distance between the opening surface of the guide plate and the air collision surface is the distance between the uniform air flow blown out from the opening surface and the air collision surface within 3 seconds.