JP2014016156A - Cleaned air blowoff device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaned air blowoff device capable of being easily installed.SOLUTION: A cleaned air blowoff device includes a push hood 2 that has an airflow blowoff surface blowing off a cleaned uniform airflow. The push hood 2 is provided with a lateral air blowoff part 28 for generating an impinging airflow of cleaned air to a peripheral wall adjacent in the peripheral edge direction of the airflow blowoff surface 23 of the push hood 2, which is formed when the push hood 2 is installed.

Description

  The present invention relates to a clean air blowing device.

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

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

  For this reason, the air flow opening surfaces of a pair of push hoods (clean air blowing devices) capable of blowing a uniform flow of purified air are arranged to face each other, and the air flow from each air flow opening surface is arranged. There has been proposed a local air cleaning device capable of making a region between a pair of push hoods into a clean air space having a higher cleanliness than other regions by causing collision (Patent Document 1).

JP 2008-275266 A

  By the way, when the clean air blowing device that blows out the clean air of the local air purifying device is placed on the floor, if the clean air blowing device and the floor surface are not in close contact with each other so as to be in an airtight state, they are attracted by the air current and cleaned Air may be caught between the clean air blowing device and the floor. In addition, when a clean air blowing device is attached with a guide and it is intended to convey clean air far away, the clean air must be in close contact so that the connection between the clean air blowing device and the guide is in an airtight state. There is a risk of getting caught in between. Thus, there is a possibility that labor may be required to install the clean air blowing device of the local air cleaning device. For this reason, the clean air blowing apparatus which can be installed easily is calculated | required.

  This invention is made | formed in view of the said situation, and it aims at providing the clean air blowing apparatus which can be installed easily.

In order to achieve the above object, a clean air blowing device according to the first aspect of the present invention comprises:
A push hood having an air flow blowing surface for blowing a cleaned uniform air flow;
The push hood is provided with a side air blowing portion for generating a collision air flow of clean air against a peripheral wall adjacent in the peripheral direction of the air flow blowing surface of the push hood formed when the push hood is installed. It is characterized by that.

The clean air blowing device according to the second aspect of the present invention is:
A push hood having an air flow blowing surface for blowing a cleaned uniform air flow;
The push hood is characterized in that a side air blowing portion for blowing a purified uniform air flow is provided on all sides of the air flow blowing surface.

It is preferable that the said side air blowing part is formed over the peripheral direction of the said airflow blowing surface of the surface in which the said side air blowing part is provided.
The push hood is formed by connecting a plurality of push hoods, for example.
The flow rate of the purified uniform air flow blown out from the air flow blowing surface is preferably 0.1 to 1.0 m / s.
The flow rate of the purified uniform air flow blown out from the air flow blowing surface is preferably 0.2 to 0.5 m / s.

  ADVANTAGE OF THE INVENTION According to this invention, the clean air blowing apparatus which can be installed easily can be provided.

It is a figure which shows the clean air blowing apparatus of this invention. It is a figure which shows the structure of a push hood. It is a figure for demonstrating the flow of the airflow between the conventional push hood and a floor surface. It is a figure for demonstrating the flow of the airflow between the push hood of this invention, and a floor surface. It is a figure which shows the structure of the push hood of other embodiment. It is a figure which shows the structure of the push hood of other embodiment. It is a figure which shows the measurement position of a dispersion | variation test. It is a figure for demonstrating the apparatus and measurement position of Examples 1-4 and Comparative Examples 1-8. It is a figure for demonstrating the apparatus and measurement position of Example 5 and Comparative Example 9. FIG. FIG. 10 is a diagram for explaining measurement positions in Example 6.

  Hereinafter, a clean air blowing device of the present invention will be described with reference to the drawings.

  FIG. 1 shows a clean air blowing device of the present embodiment. As shown in FIG. 1, the clean air blowing device 1 of this embodiment includes a push hood 2.

  The push hood 2 basically has only to have a mechanism for blowing out a purified uniform air flow, and the push hood 2 that has been conventionally used in a push-pull type ventilator has a basic structure for cleaning. A structure with a built-in filter can be employed. However, as will be described later, the push hood 2 is clean with respect to peripheral walls that are adjacent in the peripheral direction of the air flow blowing surface of the push hood 2 formed when the push hood 2 is installed, such as a floor surface, a guide, and a wall surface. A side air blowing portion for generating an air collision airflow is provided.

  The uniform air flow and the uniform flow mentioned here are synonymous with the uniform flow described in “Factory ventilation” by Taro Hayashi (published in 1982 by the Society for Air Conditioning and Hygiene Engineering). The flow of light wind speed that does not cause However, the present invention is not intended to provide an air blowing device that strictly defines the flow velocity and velocity distribution of air. The uniform air flow preferably has, for example, a variation in velocity distribution with no obstacles within ± 50%, more preferably within ± 30% of the average value.

  FIG. 2 shows the structure of the push hood 2. As shown in FIG. 2, the housing 21 of the push hood 2 is formed in a substantially rectangular parallelepiped shape, and an air flow suction surface 22 is formed on one surface thereof. For example, the air flow suction surface 22 includes a surface in which a plurality of holes are formed on the entire surface of the housing 21. In the air flow suction surface 22, outside air or room air that is ambient air outside the push hood 2 is taken in from this hole. An air blowing surface 23 is formed on the other surface of the housing 21 that faces the airflow suction surface 22. The air blowing surface 23 is composed of, for example, a surface in which a plurality of holes are formed on one entire surface of the housing 21. On the air blowing surface 23, a uniform air flow of clean air formed in the push hood 2 is blown out of the push hood 2 from this hole. Although the magnitude | size of the airflow blowing surface 23 of the push hood 2 is not specifically limited, For example, it is 1050 mm x 850 mm. Moreover, it is preferable that the flow velocity of the purified uniform air flow blown out from the air flow blowing surface 23 is 0.1 to 1.0 m / s, and is 0.2 to 0.5 m / s. Is more preferable.

A blower mechanism 24, a high-performance filter 25, and a rectifying mechanism 26 are disposed in the housing 21.
The air blowing mechanism 24 is disposed on the air flow suction surface 22 side in the housing 21. The blower mechanism 24 includes a fan for blowing air. The blower mechanism 24 takes in outside air or room air that is ambient air of the push hood 2 from the airflow suction surface 22 and blows out an airflow from the airflow blowing surface 23. The blower mechanism 24 is formed so as to vary the flow velocity of the airflow blown from the airflow blowout surface 23 by controlling the blowing 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 composed of a high-performance filter according to the cleaning level, such as a HEPA filter (High Efficiency Particulate Air Filter) or a ULPA filter (Ultra Low Penetration Air Filter) for filtering the ambient air taken in. . The high performance filter 25 cleans the ambient air taken in by the blower mechanism 24 to clean air having a desired cleaning level. The clean air cleaned to a desired cleaning level by the high-performance filter 25 is sent to the rectifying mechanism 26 by the blower mechanism 24.

  The rectifying mechanism 26 is disposed between the high-performance filter 25 and the air flow blowing surface 23. The rectifying mechanism 26 includes an air resistor (not shown), which is formed of a punching plate, a net member, or the like. The rectifying mechanism 26 is blown from the high-performance filter 25 and blown air that is biased in the air flow rate with respect to the entire air flow blowing surface 23, and the air flow rate is made uniform with respect to the entire air flow blowing surface 23. Correct (rectify) the air flow (uniform air flow). This rectified uniform air flow is blown out of the push hood 2 from the entire air flow blowing surface 23 by the blower mechanism 24.

  Further, as shown in FIG. 2, the push hood 2 is preferably provided with a pre-filter 27 between the air flow suction surface 22 in the housing 21 and the air blowing mechanism 24. An example of the prefilter 27 is a medium performance filter. By disposing the pre-filter 27 between the air flow suction surface 22 and the air blowing mechanism 24, relatively large dust contained in the ambient air sucked into the housing 21 through the air flow suction surface 22 can be removed. it can. Thus, since dust can be removed in multiple stages according to the size of the dust contained in the ambient air, the performance of the high-performance filter 25 that is likely to be clogged can be maintained for a long period of time.

  The push hood 2 is provided with a side air blowing portion 28 for generating a collision air flow of clean air against the floor surface (peripheral wall). The side air blowing portion 28 may have a structure in which a part of the uniform air flow rectified by the rectifying mechanism 26 is blown from the bottom surface of the housing 21 to the floor surface. For example, as shown in FIG. It is formed from a plurality of holes that allow the mechanism 26 and the bottom surface of the housing 21 to communicate with each other.

  Here, the plurality of holes of the side air blowing portion 28 extend over the peripheral direction (width direction) of the side air blowing portion 28 on the surface (the lower surface in FIG. 2) on which the side air blowing portion 28 is provided. Preferably it is formed. Moreover, it is preferable that the wind speed of the airflow which blows off from the side air blowing part 28 is uniform. Furthermore, it is preferable that the wind speed of the air flow blown out from the air flow blowing surface 23 is the same as the wind speed of the air flow blown out from the side air blowing portion 28. Moreover, it is preferable that the distance between the peripheral wall with which the air flow blown out from the side air blowing portion 28 collides and the surface adjacent to the peripheral wall of the push hood is constant. This is because the configuration makes it difficult for ambient air to enter the region between the side air blowing portion 28 and the floor surface.

  In the push hood 2 configured as described above, the ambient air taken in by the blower mechanism 24 is cleaned by the pre-filter 27 and the high-performance filter 25 to clean air having a desired cleaning level. Then, the cleaned clean air is rectified into a uniform air flow by the rectifying mechanism 26. The uniform air flow thus purified is blown outward from the entire air flow blowing surface 23 to the air flow blowing surface 23 of the push hood 2 in a substantially vertical direction. A part of the cleaned uniform air flow is blown out from the side air blowing portion 28 toward the bottom surface of the push hood 2 in a substantially vertical direction.

  In the local air cleaning device of Patent Document 1, a push hood that blows out a cleaned uniform air flow is directly installed on a desk or the like. The vibration when the hood is operated is transmitted to the desk. For this reason, when the anti-vibration rubber is sandwiched, a gap is easily generated between the desk and the push hood. In this way, when a gap is generated between the desk and the push hood, as shown in FIG. 3, it is attracted by a uniform air flow blown from the push hood, and the uncleaned air in the room is cleaned. It gets caught up in the air flow.

  On the other hand, the push hood 2 of the present invention is provided with the side air blowing portion 28 for blowing out a part of the uniform air flow rectified by the rectifying mechanism 26 on the bottom surface thereof. The uniform air flow blown from 28 collides with the floor surface. As shown in FIG. 4, when the uniform air flow blown out from the side air blowing section 28 collides with the floor surface, a part of the collided uniform air flow flows out to the outside of the floor surface where it collided. Therefore, the air on the air flow suction surface 22 side of the push hood 2 (ambient air outside the local air cleaning device) does not enter the region between the floor surface and the side air blowing portion 28. For this reason, the cleanliness of the area | region by the side of the air flow blowing surface 23 of the push hood 2 is maintained. Therefore, it is not necessary to install the clean air blowing device 1 and the floor so as to be in an airtight state, and the clean air blowing device 1 can be easily installed.

  Here, the distance between the floor surface (peripheral wall) and the side air blowing portion 28 (push hood 2) is preferably 50 mm or less, and more preferably 20 mm or less. By setting it as such a range, the air on the air flow suction surface 22 side of the push hood 2 becomes more difficult to enter the region between the floor surface and the side air blowing portion 28, and the air flow blowing surface of the push hood 2. This is because the degree of cleaning of the 23 side region is maintained.

  Further, when the uniform air flow blown out from the side air blowing portion 28 collides with the floor surface (peripheral wall) and the collided uniform air flow intersects with the uniform air flow blown out from the air flow opening surface 23, respectively. It is preferable that the wind speeds are approximately the same. This is because the uniformity of the uniform air flow blown out from the air flow opening surface 23 is maintained.

  As described above, according to the local air cleaning device 1 of the present embodiment, the side air blowing portion 28 that blows out a part of the uniform air flow rectified by the rectifying mechanism 26 on the bottom surface of the push hood 2 is provided. Since it is provided, the surrounding air on the air flow suction surface 22 side (external to the local air cleaning device) of the clean air blowing device 1 does not enter the region between the floor surface and the side air blowing portion 28. For this reason, it is not necessary to install the clean air blowing device 1 and the peripheral wall including the floor so as to be in an airtight state, and the clean air blowing device 1 can be easily installed.

  In addition, this invention is not restricted to said embodiment, A various deformation | transformation and application are possible. Hereinafter, other embodiments applicable to the present invention will be described.

  In the above embodiment, the present invention has been described by taking the floor as an example of the member close to the push hood 2, but the present invention has the side air blowing portion 28 on the surface facing the member close to the push hood 2. For example, as shown in FIG. 5, the side air blowing portion 28 faces not only the position facing the floor surface of the push hood 2 but also the guide 3 provided on the push hood 2. It may also be provided at the position. In this case, a side air blowing section 28 for blowing a uniform air flow that is purified toward the floor surface is provided on the bottom surface of the push hood 2, and on the side surface of the push hood 2 and the top surface of the push hood 2, A side air blowing portion 28 for blowing a uniform air flow that is cleaned toward the guide 3 is provided.

  When a guide is provided on the push hood of Patent Document 1 (to convey a clean uniform air flow far), the guide is clean from the gap between the push hood and the guide unless the push hood and the guide are connected in an airtight state. Uncleaned air is mixed in and the purified uniform air flow blown out of the push hood is contaminated. On the other hand, in the push hood 2 of the present invention, the side air blowing portion 28 is provided on the surface facing the guide 3, and the cleaned air is blown out from the side air blowing portion 28. For this reason, air flows out so as to flow outward from between the guide 3 and the side air blowing portion 28, and the purified uniform air flow blown out from the air flow blowing surface 23 of the push hood 2 may be contaminated. Disappear. For this reason, it is not necessary to install the push hood 2 and the connection portion of the guide 3 so as to be in an airtight state, and the clean air blowing device 1 can be easily installed.

  Further, when a wall is close to the push hood 2 (side surface thereof), the side air blowing portion 28 may be provided on the surface facing the wall. In this case, it is not necessary to install the push hood 2 and the connecting portion of the wall so as to be in an airtight state, and the clean air blowing device 1 can be easily installed.

  In the said embodiment, although this invention was demonstrated to the case where the push hood 2 was comprised from one push hood as an example, even if the number of push hoods which comprise the push hood 2 is two or more Good. For example, the push hood 2 may be connected to four (two vertical × two horizontal) push hoods by a connector. Further, nine push hoods 2 (three vertical × three horizontal) push hoods may be connected by a connector. When the push hoods 2 are connected as described above, the push hood air flow opening surfaces are in the same direction, and the short sides and the long sides of the push hoods are arranged adjacent to each other. For example, as shown in FIG. 6, the push hood 2 is connected to the nine push hoods with the air flow opening surfaces in the same direction, and the short sides and the long sides of the push hoods are adjacent to each other. When the push hoods 2d to 2i that do not have a bottom surface facing the floor surface to be installed are used, it is possible to employ push hoods conventionally used in push-pull type ventilators. it can. On the other hand, in the push hoods 2a to 2c having a bottom surface facing the floor surface on which the push hood 2 is installed, a uniform air flow that is cleaned toward the floor surface is blown out to the structure of the conventional push hood. A side air outlet 28 is provided. Also in this case, the clean air blowing device 1 can be easily installed by providing the side air blowing portion 28 at a position facing the bottom surface of the push hood 2.

  The push hood 2 may have a structure in which casters are attached to the bottom surface. In this case, the push hood 2 can be easily moved. Needless to say, the push hood 2 can be used not only as a local air cleaning device but also as a push hood of a push-pull type ventilation device. Further, the shape of the push hood 2 is not limited to a substantially rectangular parallelepiped.

  Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention.

  First, it was confirmed whether or not the air velocity of the air flow blown out from the air flow blowing surface 23 varies by blowing out the air flow from the side air blowing portion 28 of the push hood 2. The case where the air flow is blown out from the side air blowing portion 28 provided on the lower surface of the push hood 2 toward the floor surface and the case where the air flow is not blown out are changed to a wind speed of 0.2 to 0.5 m / s. The wind speed at the measurement position shown in FIG. The size of the air flow blowing surface 23 of the push hood 2 at this time was 300 mm in length and 500 mm in width. Moreover, the blowing width | variety of the airflow from the side air blowing part 28 was 10 mm. The push hood 2 is provided with four anti-vibration rubbers (not shown) on the surface in contact with the floor surface, and the distance between the floor surface and the surface adjacent to the floor surface of the push hood 2 is about 5 mm. It has become. Table 1 shows the results of not blowing the air flow from the side air blowing section 28, and Table 2 shows the results of blowing the air flow from the side air blowing section 28.

  As shown in Table 1 and Table 2, it can be confirmed that there is no variation in the wind speed of the airflow blown from the airflow blowing surface 23 regardless of whether or not the airflow is blown from the side air blowing portion 28. It was.

(Examples 1-4, Comparative Examples 1-8)
As shown in FIG. 8, the clean air blowing device 1 of the present invention is arranged on a table T so that the air flow blowing surface 23 of the push hood 2 faces, and the wind speed and the distance L between the push hoods 2 are changed. The cleanliness was measured on the A side (L / 2), B side (L / 3), and C side (L / 6). In this example, while blowing an airflow from the airflow blowing surface 23, the airflow is blown out from the side air blowing part 28 provided in the lower surface of the push hood 2 toward the floor surface. On each surface, the cleanliness was measured for a total of nine midpoints divided into three. The cleanliness was measured by using LASAIR-II manufactured by PMS, and measuring the number of dust particles (particles / CF) having a particle size of 0.3 μm. The degree of cleanliness was evaluated as high cleanliness when the number was 300 or less. The results are shown in Tables 3-6. In addition, Tables 7 to 10 show cases where the air flow is not blown from the side air blowing portion 28 (Comparative Examples 1 to 4).

  As shown in Tables 7 to 10, the distance L between the push hoods 2 is 550 mm unless the air flow is blown from the side air blowing portion 28 of the push hood 2, and in all lower areas of the A surface to the C surface. Even though the distance L between the push hoods 2 is further increased by blowing out an air flow from the side air blowing portion 28 of the push hood 2 as shown in Tables 3 to 6 while the result of the cleaning degree is deteriorated. It was confirmed that the cleanliness was good. For this reason, it confirmed that the clean air blowing apparatus 1 could be installed easily.

(Example 5, Comparative Example 9)
As shown in FIG. 9, a guide 3 having a length of 12 m is provided on the push hood 2, and all the side surfaces (side blowing surface (upper), side blowing surface ( Bottom), side blowing surface (left), and side blowing surface (right)), when using the clean air blowing device 1 provided with the side air blowing portion 28, the position (surface) from the push hood 2 to 6 m ) To measure cleanliness. In this example, nine push hoods 2 are arranged so that the air flow opening surfaces are in the same direction and the short sides and the long sides of the push hoods 2a are adjacent to each other. Are connected. In this example, an air flow is blown from the air flow blowing surface 23 and an air flow is blown from the side air blowing portion 28. The wind speed of the air flow was 0.2 m / s. The measurement positions were 6 points in total, that is, a midpoint divided into three parts of 1/2 of the overall height (upper) and 1/6 of the overall height (lower). The measurement of cleanliness is the same as in Examples 1-4. The results are shown in Table 11. Table 12 shows the case where the air flow is not blown out from the side air blowing portion 28 (Comparative Example 5).

  As shown in Tables 11 and 12, it was confirmed that the cleaning degree was good by blowing the air flow from the side air blowing part 28. For this reason, even if the guide 3 was provided in the push hood 2 of the clean air blowing device 1, it was confirmed that the clean air blowing device 1 can be easily installed.

(Example 6)
Similarly to Example 5, in the case where the clean air blowing device 1 shown in FIG. 9 is used, the side upper portion (measurement point 1) and side in the guide 3 shown in FIG. 10 between the push hood 2 and the guide 3 The cleanliness of two points at the lower part (measurement point 2) was measured. In this example, an air flow is blown from the air flow blowing surface 23 and an air flow is blown from the side air blowing portion 28. The wind speed of the air flow was 0.3 m / s. For comparison, the cleanliness was also measured for the upper side (measurement point 3) and the lower side (measurement point 4) outside the clean air blowing device 1 (outside the guide). The measurement of cleanliness is the same as in Examples 1-5. Further, the wind speed at the measurement points 1 and 2 was measured. These results are shown in Table 13.

  As shown in Table 13, it was confirmed that the degree of cleanliness was also good between the push hood 2 and the guide 3. It was also confirmed that there was no change in the wind speed of the air flow. For this reason, even if the guide 3 was provided in the push hood 2 of the clean air blowing device 1, it was confirmed that the clean air blowing device 1 can be easily installed.

  The present invention is useful for a clean air blowing device.

DESCRIPTION OF SYMBOLS 1 Clean air blowing apparatus 2 Push hood 21 Housing 22 Air flow suction surface 23 Air blowing surface 24 Blowing mechanism 25 High performance filter 26 Rectification mechanism 27 Pre filter 28 Side air blowing part

Claims (1)

A push hood having an air flow blowing surface for blowing a cleaned uniform air flow;
The push hood is provided with a side air blowing portion for generating a collision air flow of clean air against a peripheral wall adjacent in the peripheral direction of the air flow blowing surface of the push hood formed when the push hood is installed. A clean air blowing device characterized by that.