Patent Application
20140366498
The present invention relates to a local air cleaning apparatus.
Conventionally, a clean bench is often used as an apparatus for improving air cleanliness of a local work space. In a typical clean bench, only a front side of the work bench has an opening for performing work and sides thereof other than the front side form an enclosure in order to maintain cleanliness. In such a clean bench, a clean air outlet is arranged in the enclosure, and a worker puts his or her hands therein from the front opening for working to perform work.
However, the opening for working in the clean bench is narrow. Accordingly, for workers performing the assembly of precision instrument or the like, there is a problem with workability. In addition, as in a production line, when work involves the transfer of manufactured articles or manufacturing components, procedures such as arrangement of the entire line in the clean room have been taken. This is, however, problematic in terms of increasing the size of equipment.
Therefore, the present inventors proposed a local air cleaning apparatus in which air flow opening faces of a pair of push hoods capable of blowing out a uniform flow of cleaned air are arranged opposite to each other to cause collision of air flows from the respective air flow opening faces so as to allow a region between a pair of push hoods to be a clean air space having higher cleanliness than other regions (Patent Literature 1).
Meanwhile, depending on the kind of work and the procedures of work, it may be desirable in some cases to work in a little wider clean air space. Therefore, there has been a desire for a local air cleaning apparatus capable of forming a wider clean air space.
The present invention has been accomplished in view of the above problem, and it is an objective of the present invention to provide a local air cleaning apparatus capable of forming a wide clean air space.
In order to achieve the above objective, a local air cleaning apparatus according to a first aspect of the present invention comprises:
a pair of push hoods each comprising an air flow opening face for blowing out a cleaned uniform air flow and
a pair of guides each provided on a side of each of the push hoods comprising the air flow opening face, each of the pair of guides extending from the side of the each push hood comprising the air flow opening face toward a downstream side of the uniform air flow to form an opening face at a downstream-side end portion of the each guide,
wherein
the pair of push hoods are arranged such that the respective air flow opening faces of the push hoods are opposed to each other;
the opening faces of the pair of guides are spaced apart from and opposed to each other so as to form an open region between the opening faces of the respective guides; and
the cleaned uniform air flows blown out from the respective air flow opening faces collide with each other in the open region to flow out of the open region so as to cause the insides of the guides and the inside of the open region to have higher cleanliness than other regions.
A local air cleaning apparatus according to a second aspect of the present invention comprises:
a pair of push hoods each comprising an air flow opening face for blowing out a cleaned uniform air flow and
a guide provided on a side of one of the pair of push hoods comprising the air flow opening face, the guide extending from the side of the one push hood comprising the air flow opening face toward a downstream side of the uniform air flow to form an opening face at a downstream-side end portion of the guide, wherein
the pair of push hoods are arranged such that the respective air flow opening faces of the push hoods are opposed to each other;
the opening face of the guide is spaced apart from and opposed to the air flow opening face of the other push hood not provided with the guide, so as to form an open region between the opening face of the guide and the air flow opening face of the push hood not provided with the guide; and
the cleaned uniform air flows blown out from the respective air flow opening faces collide with each other in the open region to flow out of the open region so as to cause the inside of the guide and the inside of the open region to have higher cleanliness than other regions.
In the local air cleaning apparatus according to the first aspect, preferably, the respective opening faces of the guides are of substantially the same shape.
In the local air cleaning apparatus according to the second aspect, preferably, the opening face of the guide and the air flow opening face of the push hood not provided with the guide are of substantially the same shape.
Preferably, the opening face of the guide and the air flow opening face of the push hood provided with the guide are of substantially the same shape.
Each of the pair of push hoods can comprise, for example, a plurality of push hoods connected together.
Preferably, the cleaned uniform air flows blown out from the air flow opening faces have a flow rate of 0.2 to 0.7 m/s.
The present invention can form a wide clean air space.
Hereinafter, a local air cleaning apparatus according to the present invention will be described with reference to the drawings.
As depicted in
The pair of push hoods 2 and 3 is not particularly limited as long as the push hoods have a mechanism for blowing out a cleaned uniform air flow. As a structure of each push hood, there can be employed a structure in which a cleaning filter is incorporated in a basic structure of a push hood conventionally used in push-pull ventilators.
The terms uniform air flow and uniform flow used herein have the same meaning as uniform flow described in “Industrial Ventilation” by Taro Hayashi (published by the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan, 1982) and refer to a flow having a low air velocity, which is uniformly continuous and causes no large whirling portion. However, the present invention does not intend to provide an air blowout apparatus strictly specifying a flow rate of air and a velocity distribution. In the uniform air flow, for example, a variation in a velocity distribution in a state without obstacles is preferably within ±50%, and furthermore within ±30%, with respect to the average value.
In the push hoods 2 and 3 of the present embodiment, respective nine (longitudinal three pieces×transversal three pieces) push hoods are connected by a connector in such a manner that the air flow opening faces of the push hoods are oriented in the same direction and short sides and long sides, respectively, of the push hoods are arranged adjacent to each other. Herein, structures of the push hoods connected by the connector are basically the same. Accordingly, a description will be given of the structure of a push hood 2a as one of the push hoods, thereby describing the structures of the push hoods 2 and 3 of the present embodiment.
As depicted in
The push hoods 2 and 3 are arranged such that the respective air flow opening faces 23 are opposed to each other. Herein, the description “the respective air flow opening faces 23 are opposed to each other” mean not only a state in which the respective air flow opening faces 23 of the push hoods 2 and 3 are opposed in parallel to each other, but also, for example, a state in which the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3 are slightly inclined from each other, as depicted in
Inside the housing 21 are arranged an air blowing mechanism 24, a high performance filter 25, and a rectification mechanism 26.
The air blowing mechanism 24 is arranged on a side where the air flow suction face 22 is located in the housing 21. The air blowing mechanism 24 comprises an air suction fan and the like. The air blowing mechanism 24 takes in an outside air or a room air, which is the surrounding air of the push hood 2a, from the air flow suction face 22 and blows out an air flow from the air flow opening face 23. In addition, the air blowing mechanism 24 is configured to control a suction force of the fan so as to allow the flow rate of an air flow blown out from the air flow opening face 23 to be changed.
The high performance filter 25 is arranged between the air blowing mechanism 24 and the rectification mechanism 26. The high performance filter 24 comprises a high performance filter corresponding to a cleaning level, such as a HEPA filter (High Efficiency Particulate Air Filter), for filtrating the surrounding air taken in. The high performance filter 25 cleans the surrounding air taken in by the air blowing mechanism 24 into a clean air having a desirable cleaning level. The clean air cleaned to the desirable cleaning level by the high performance filter 25 is sent to the rectification mechanism 26 by the air blowing mechanism 24.
The rectification mechanism 26 is arranged between the high performance filter 25 and the air flow opening face 23. The rectification mechanism 26 is provided with a not-shown air resistor. The air resistor is a blown-air resistor for correcting a blown air having an amount of aeration biased with respect to an entire part of the air flow opening face 23 into a uniformized air flow (a uniform air flow) having an amount of aeration unbiased with respect to the entire part of the air flow opening face 23. The air resistor is formed using a punching plate, a mesh member, and/or the like. The rectification mechanism 26 corrects (rectifies) a clean air sent from the high performance filter 25 into a uniformized air flow (a uniform air flow) having an amount of aeration unbiased with respect to the entire part of the air flow opening face 23. The rectified uniform air flow is blown out by the air blowing mechanism 24 from the entire part of the air flow opening face 23 to the outside of the push hood 2.
In addition, as depicted in
In the push hood 2a thus formed, the surrounding air taken in by the air blowing mechanism 24 is cleaned into a clean air having a desirable cleaning level by the pre-filter 27 and the high performance filter 25. Then, the clean air obtained by the cleaning is rectified into a uniform air flow by the rectification mechanism 26. The uniform air flow thus cleaned is blown out externally from the entire part of the air flow opening face 23 in a direction substantially vertical to the air flow opening face 23 of the push hood 2a.
One ends of the guides 4 and 5 are provided on sides of the push hoods 2 and 3 having the air flow opening faces 23. In addition, the guides 4 and 5 are provided on the air flow opening faces 23 and formed in such a manner as to extend therefrom toward downstream sides of uniform air flows blown out from the air flow opening faces 23 and cover outer peripheral outline portions of the air flow opening faces 23. For example, when the air flow opening faces 23 are rectangular, the guides 4 and 5 are formed to be extended so as to have a U-shape. With an open side of the U-shape and a floor, each of the guides 4 and 5 including the outer peripheral outline portion in a blowout direction of the uniform air flow surrounds, like a tunnel, the periphery of the air flow in parallel to a stream of the uniform air flow blown out therefrom. Additionally, when there is no floor, the guides 4 and 5 are formed to be extended so as to have, for example, square shapes, not U-shapes. These guides 4 and 5 are formed so as to have an open region between the respective other ends (the opening faces 41 and 51). Herein, the opening faces 41 and 51 of the guides 4 and 5 refer to hollow end faces, namely openings, which are surrounded by peripheral edge outlines of downstream-side end portions (boundaries with the open region) of the guides 4 and 5 extending like the tunnel toward the downstream sides of the uniform air flows blown out from the air flow opening faces 23. For example, in a case of substituting the floor for a part of the guides 4 and 5, when the cross sections of the guides 4 and 5 are U-shaped, square hollow openings formed by the downstream-side end portions of the guides 4 and 5 and the floor correspond to the opening faces 41 and 51. When the cross sections of the guides 4 and 5 are square shaped, square hollow openings formed at the downstream-side end portions of the guides 4 and 5 correspond to the opening faces 41 and 51.
The guides 4 and 5 can be formed using an arbitrary material as long as air flows blown out from the opening faces 41 and 51 can maintain the state of cleaned uniform air flows blown out from the air flow opening faces 23. In addition, the guides 4 and 5 do not necessarily have to completely cover the entire peripheries of the uniform air flows as long as the state of the cleaned uniform air flows blown out from the air flow opening faces 23 can be maintained. For example, a hole may be opened or a slit may be formed, partially in the guides 4 and 5.
Preferably, the opening faces 41 and 51 are formed so as to have substantially the same shape. When the uniform air flows collide head on with each other, the mutual air flows do not intermingle with each other and exhibit a behavior of substantially vertically changing the directions of the flows, as depicted in
However, the shapes of the opening faces 41 and 51 do not necessarily have to be substantially the same as each other. For example, as depicted in
For example, as depicted in
In addition, preferably, the shapes of the opening faces 41 and 51 are formed to be substantially the same as the shapes of the air flow opening faces 23. This is because, by making the shapes of the opening faces 41 and 51 substantially the same as those of the air flow opening faces 23, the state of the uniform air flows blown out from the air flow opening faces 23 can be easily maintained in the opening faces 41 and 51. However, the shapes of the opening faces 41 and 51 do not necessarily have to be substantially the same as those of the air flow opening faces 23. For example, as depicted in
The guides 4 and 5 are arranged such that the opening faces 41 and 51 are opposed to each other. This is because arranging the guides 4 and 5 such that the opening faces 41 and 51 are opposed to each other allows the mutual air flows to collide head on with each other. Herein, the description “the opening faces 41 and 51 are opposed to each other” means not only a state in which the opening faces 41 and 51 are opposed parallel to each other, but also, for example, a state in which, as depicted in
A length b of the guide 4 and 5 can be any length as long as an open region can be formed between the opening faces 41 and 51 of the guides 4 and 5 by spacing the opening faces 41 and 51 apart from each other and opposing to each other. The length b of the guides 4 and 5 is preferably a predetermined length in accordance with a distance X between the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3, the flow rates of the uniform air flows blown out from the air flow opening faces 23 (the opening faces 41 and 51), and the like. For example, when the distance X between the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3 is 12 m, the length b of the guides 4 and 5 is preferably 4 m or more, for example, 4 to 5.75 m, at a flow rate of the uniform air flow of 0.7 m/s. In addition, when the distance X is 12 m, the length b of the guide 3 is, preferably, 3.25 to 5.75 m at a flow rate of the uniform air flow of 0.5 m/s, 5 to 5.75 m at 0.2 m/s, and 5.5 to 5.75 m at 0.1 m/s.
The guides 4 and 5 thus formed are, as depicted in
In the local air cleaning apparatus 1 thus formed, a surrounding air near the air flow suction face 22 taken in by the air blowing mechanism 24 of each of the push hoods 2 and 3 is cleaned by the pre-filter 27 and the high performance filter 25 into a clean air having a desirable cleaning level. Then, the clean air obtained by the cleaning is rectified into a uniform air flow by the rectification mechanism 26 and the cleaned uniform air flow is blown out into each of the guides 4 and 5 from the entire part of the air flow opening face 23.
Herein, the cleaned uniform air flows blown out from the air flow opening faces 23 have a flow rate of preferably 0.7 m/s or less, more preferably 0.5 m/s or less, still more preferably 0.4 m/s or less, and most preferably 0.2 to 0.1 m/s. This is because when blown out at these flow rates, the cleaned uniform air flows blown out from the air flow opening faces 23 move in such a manner as to be extruded through the insides of the guides 4 and 5 and the state of the uniform air flows is easily maintained in the guides 4 and 5. Furthermore, slowing the flow rate can suppress noise level and power consumption and also can reduce loads on the pre-filter 27 and the high performance filter 25. On the other hand, in a situation in which contaminants are generated in the cleaned space of the guide 4 or 5, the contaminants in the guide can be more quickly removed at a flow rate of the uniform air flow of about 0.5 m/s than at a flow rate thereof of 0.2 m/s. Thus, according to the purpose of use, the flow rate of the uniform air flow can be freely determined.
The cleaned uniform air flow blown out in the guide 4 passes through the guide 4 while maintaining the state of the uniform air flow, and is blown out from the opening face 41. In addition, the cleaned uniform air flow blown out in the guide 5 passes through the guide 5 while maintaining the state of the uniform air flow, and is blown out from the opening face 51.
The air flow blown out from the opening face 41 collides with the air flow blown out from the opening face 51 in the open region formed between the respective opening faces. The air flows having collided flow outside the open region (outside the local air cleaning apparatus 1). As a result, the region between the air flow opening faces 23 (the inside of the guide 4, the inside of the guide 5, and the open region between the opening faces 41 and 51) can have higher cleanliness than regions outside the local air cleaning apparatus 1.
Herein, a comparison was made between the present invention and the local air cleaning apparatus described in Patent Literature 1. For the comparison, dimensions of the air flow opening faces of the push hoods in both apparatuses were set to a width of 1050 mm and a height of 850 mm, and respectively, nine push hoods (longitudinal three pieces×transversal three pieces) each having the air flow opening face were connected together and opposed to each other. In this case, in the local air cleaning apparatus described in Patent Literature 1, it was confirmed that the open region was a clean air space until the distance between the air flow opening faces 23 reached about 5.5 m. In contrast, in the local air cleaning apparatus 1 of the present invention, when an open region is provided by attaching respective guides having a length of 3.25 m, from the air flow opening faces toward the downstream sides, to the outer peripheral outline portions of the pair of push hoods opposed to each other, in which each push hood includes nine push hoods having the same structure as those in Patent Literature 1 described above and connected together, and setting the distance between the opening faces 41 and 51 to 5.5 m, like the distance between the air flow opening faces of the pair of push hoods in Patent Literature 1 described above, the clean air space corresponds to a sum of the open region between the opening faces 41 and 51 and the distance from the air flow opening faces of the pair of push hoods to the opening faces of the respective guides. In other words, the distance 12 m between the air flow opening faces 23 is the clean air space. Accordingly, the local air cleaning apparatus 1 of the present invention can form a wide clean air space.
In addition, compared to an open-type air cleaning apparatus using the technology described in Patent Literature 1, even when air velocities of uniform air flows blown out from the push hoods having the same area are the same, the present invention can provide a considerably wider clean air space. Thus, even when the power consumptions of the push hoods 2 and 3 are the same, the amount of electricity consumed per unit area in the clean air space can be reduced. Or when cleaning of the same clean space, air velocity can be slower than in Patent Literature 1, enabling the power consumption to be reduced. Then, reduction in the air velocity can also reduce noise due to the operation of the local air cleaning apparatus, as well as can suppress the exhaustion of the filters for obtaining a clean air. Additionally, when the open-type local air cleaning apparatus of Patent Literature 1 was installed under the above conditions, it was confirmed that power consumption was 7200 W and noise level was 75 dB(A) in the center between the air flow opening faces 23 opposed to each other. In contrast, when the apparatus of the present invention was used under the above installation conditions (the distance between the air flow opening faces 23: 22 m; each guide length: 10 m), power consumption and noise level in the center between the air flow opening faces 23 were confirmed to be equivalent to those in the apparatus of Patent Literature 1. In other words, in Patent Literature 1, a space with a volume of about 45 cubic meters was cleaned and the amount of electricity consumed for cleaning per cubic meter was about 160 W, whereas the apparatus of the present invention was confirmed to have cleaned a space with a volume of about 177 cubic meters and the amount of electricity consumed for cleaning per cubic meter was confirmed to be about 41 W. Additionally, although the present invention described above has exemplified the case in which the distance between the air flow opening faces 23 is 22 m, increasing the distance can lead to further reduction in the power consumption per unit volume.
Furthermore, in a typical clean room, the entire room is cleaned and it is therefore not easy to perform construction work, whereas in the local air cleaning apparatus 1 of the present embodiment, the pair of push hoods 2 and 3 can be easily moved. In addition, the local air cleaning apparatus 1 of the embodiment can significantly facilitate layout changes in the work region, such as bending the guides 4 and 5 provided on the push hoods 2 and 3 depending on the work in a range that does not affect uniform air flows, removing the guide of one of the push hoods, and moving an open region formed between the opening faces of the guides to an arbitrary position.
In addition, in the case of a typical clean room in which a worker himself or herself enters a clean region to perform work, a work region for the worker is not changed no matter how much distance between a floor on which the worker works and a ceiling with a clean air blowing apparatus is increased. However, in the local air cleaning apparatus 1, a horizontal flow is used. Thus, increases of regions in the guides 4 and 5 can lead to an increase of a work region (floor area) for the worker himself or herself entering the clean region to perform work.
Additionally, in the open region of the present embodiment, there are no doors that allow a worker, a component, and a manufacturing machine to pass through, necessary in a typical clean room. Thus, cleanliness reduction in the clean air region caused by opening of the doors does not occur and going in-and-out of a worker and carrying-in and -out of a component or the like can be always done through the open region. In addition, even if the insides of the guides 4 and 5 and the inside of the open region are contaminated, cleaning can be performed in a significantly short time, although it takes a couple of hours to perform cleaning in a typical clean room.
As described above, according to the local air cleaning apparatus 1 of the present embodiment, the arrangement of the guides 4 and 5 allows the inside of the guide 4, the inside of the guide 5, and the open region between the opening faces 41 and 51 to have higher cleanliness than regions outside the local air cleaning apparatus 1, so that a wide clean air space can be formed.
The present invention is, however, not limited to the above embodiment and various modifications and applications can be made. Hereinafter, a description will be given of other embodiments applicable to the present invention.
While the present invention has been described with reference to the above embodiment exemplifying the case in which the guides 4 and 5 are of the same length, the lengths of the guides 4 and 5 may be different. Even in this case, the inside of the guide 4, the inside of the guide 5, and the open region between the opening faces 41 and 51 can have higher cleanliness than regions outside the local air cleaning apparatus 1, thus allowing the formation of a wide clean air space.
In the above embodiment, the case in which the respective guides 4 and 5 are provided on the push hoods 2 and 3 has been exemplified to describe the present invention. However, for example, as depicted in
The above embodiment has exemplified the case in which the shapes of the guides 4 and 5 continuing to the push hoods 2 and 3 are extended straightly from the air flow opening faces 23 of the push hoods 2 and 3 toward the opening faces 41 and 51 of the guides in order to describe the present invention. However, as depicted in
In the above embodiment, the present invention has been described by exemplifying the case in which the push hoods 2 and 3, respectively, include respective nine (longitudinal three pieces×transversal three pieces) push hoods connected together by a connector. However, the number of push hoods forming each of the push hoods 2 and 3 may be either 10 or more or 8 or less. For example, the push hoods 2 and 3 may include respective four (longitudinal two pieces×transversal two pieces) push hoods connected together by a connector. In order to connect the push hoods like these examples, the push hoods are arranged such that the air flow opening faces of the push hoods are oriented in the same direction and short sides and long sides, respectively, of the push hoods are adjacent to each other. In this case, preferably, the mutual push hoods are connected together in such a manner that side faces, upper and lower faces, or both of the side faces and the upper and lower faces of the adjacent push hoods are in an airtight state, or the mutual push hoods are connected in an airtight state via a seal material such as a packing interposed between the side faces, the upper and lower faces, or both thereof of the adjacent push hoods. In addition, as depicted in
The above embodiment has described the present invention by exemplifying the case in which, in the open region between the opening faces 41 and 51, the upper face and both side faces are open. However, for example, as depicted in
In addition, the push hoods 2 and 3 may have a structure with casters on the bottoms thereof. In this case, the push hoods 2 and 3 can be easily moved. Additionally, the guides 4 and 5 may be units of partitions with casters, which have a shape flexibly connectable to the push hoods 2 and 3, where the units may be covered with a vinyl sheet. In this case, construction work can be easy and movement of the units can also be easy. Furthermore, the guides 4 and 5 may be formed like a vinyl house extensible in a stream direction of an air flow in a shape of bellows. In this case, the lengths of the guides 4 and 5 can be easily changed, the guides 4 and 5 can be easily bent, and the positions of the guides 4 and 5, namely, a position for obtaining a clean space can be easily changed.
For example, when forming a clean zone in a corner of a room, a side wall face and/or the floor may be substituted for a part of the guides 4 and 5.
In addition, when a part of a conveyor-like line is arranged in a clean space, the part of the line intended to be cleaned may be entirely covered to be enclosed as in a tunnel; then, a push hood (2) may be attached so as to be connected to one end of the enclosed part of the line, whereas the other end thereof may be kept in an open state (opening face 41) to arrange the other push hood 3 at a position opposing the open end. In such an example, when the line is arranged along a wall, the wall can be substituted for a part of the guide 4.
Hereinafter, the present invention will be described in more detail with reference to specific Examples of the invention
Using the local air cleaning apparatus 1 depicted in
As indicated in Table 1, it was able to be confirmed that the arrangement of the guides 4 and 5 allowed the inside of the guide 4, the inside of the guide 5, and the open region between the opening faces 41 and 51 to have higher cleanliness than the regions outside the local air cleaning apparatus 1.
As depicted in
As indicated in Tables 2 to 6, it was able to be confirmed that even when the flow rate of the cleaned uniform air flow and the length b of the guides 4 and 5 were changed, the arrangement of the guides 4 and 5 allowed the opening face 41, the opening face 51, and the open region between the opening faces 41 and 51 to have higher cleanliness than the regions outside the local air cleaning apparatus 1. In Example 3, it took 62 seconds to obtain the clean state.
In Example 7, cleanliness was measured in the same manner as Example 3, except that the distance between the opening faces 41 and 51 was 3.5 m, the length b of the guides 4 and 5 was 3.25 m, and the distance X between the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3 was 10 m. In Example 8, cleanliness was measured in the same manner as Example 3, except that the distance between the opening faces 41 and 51 was 3.5 m and the distance X between the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3 was 8 m. The results are given in Tables 7 and 8.
As indicated in Tables 7 and 8, it was able to be confirmed that even when the distance X between the air flow opening face 23 of the push hood 2 and the air flow opening face 23 of the push hood 3 was changed, the arrangement of the guides 4 and 5 allowed the opening face 41, the opening face 51, and the open region between the opening faces 41 and 51 to have higher cleanliness than the regions outside the local air cleaning apparatus 1.
In Example 9, cleanliness was measured in the same manner as Example 3, except for using the local air cleaning apparatus depicted in
As indicated in Tables 9 and 10, it was able to be confirmed that even in the cases of using the local air cleaning apparatus including the push hoods 2 and 3 each comprising a single push hood depicted in
In Example 11, cleanliness was measured in the same manner as Example 3, except for using the local air cleaning apparatus depicted in
As indicated in Tables 11 and 12, it was able to be confirmed that even in the case of using the local air cleaning apparatus in which the guide 4 was provided only on the push hood 2 depicted in
In Example 13, cleanliness was measured in the same manner as Example 3, except for using the local air cleaning apparatus depicted in
As indicated in Tables 13 and 14, it was able to be confirmed that even in the cases of using the local air cleaning apparatus including the opening face 51 enlarged to be larger than the opening face 41 depicted in
In Example 15, cleanliness was measured in the same manner as Example 3, except for using a local air cleaning apparatus depicted in
As indicated in Table 15, it was able to be confirmed that even in the case of using the local air cleaning apparatus including the guides 4 and 5 whose upper surface end portions were connected to form the region with only both side faces open depicted in
Regarding the case of Example 1, the flow rate of the cleaned uniform air flow was changed to 0.2 m/s, 0.3 m/s, and 0.5 m/s, respectively, to measure power consumption and noise in the center between the opening faces. In addition, the length b of the guide 4 in Example 1 was changed to 10 m (Example 16) and 20 m (Example 17), respectively, and the flow rate of the cleaned uniform air flow in Example 1 was changed to 0.2 m/s, 0.3 m/s, and 0.5 m/s, respectively, to similarly measure power consumption and noise in the center between the opening faces. The results are given in Table 16.
As indicated in Table 16, due to the changes of the flow rate of the uniform air flow to 0.2 to 0.5 m/s, the power consumption was changed to 2124 to 7200 W. In addition, due to the changes of the flow rate of the uniform air flow to 0.2 to 0.5 m/s, the noise level was changed to 59.0 to 75.0 dB(A) in Example 1, 56.0 to 70.4 dB(A) in Example 16, and 55.4 to 69.1 dB(A) in Example 17. Thus, it was able to be confirmed that the reduction in the flow rate of the uniform air flow reduced the power consumption and the noise level.
The present application is based on Japanese Patent Application No. 2011-152338 filed on Jul. 8, 2011 and Japanese Patent Application No. 2012-107029 filed on May 8, 2012, the entire specifications, claims, and drawings of which are incorporated herein by reference.
The present invention is useful for air cleaning in a local work space.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2011-152338 | Jul 2011 | JP | national |
| 2012-107029 | May 2012 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2012/066031 | 6/22/2012 | WO | 00 | 8/18/2014 |
