DESCRIPTION
Title of Invention
PURIFIED AIR DISCHARGE DEVICE
5 Technical Field
[OOOl] The present invention relates to a purified air discharge device.
Background Art
[0002] Clean benches have often been used as a device for improving the air
cleanliness in a local work area. A conventional clean bench has a work opening only
10 on the fi-ont side of the work table and is enclosed on the other sides for maintaining
cleanliness. Such a clean bench is provided with a purified air discharge port within the
enclosure and the worker inserts his hands from the front work opening to do tasks.
[0003] However, the work opening of a clean bench is small and causes a problem
with the workability when the worker assembles precise machines or does other tasks.
1 5 Furthermore, where products or manufacturing parts are moving as on a manufacturing
line, a traditional measure is to enclose the entire line in a clean room; then, a problem is
that the equipment becomes large.
[0004] For the above reason, a local cleaning apparatus has been proposed (Patent
Literature 1) in which a pair of push hoods (purified air discharge devices) capable of
20 discharging a uniform purified air flow is placed with their air flow opening surfaces
facing each other so that the air flows from their respective air flow opening surfaces
collide with each other and create a purified air space having a higher level of cleanliness
in the area between the pair of push hoods than in the other areas.
Citation List
25 Patent Literature
[00051 Patent Literature 1 : Unexamined Japanese Patent Application Kokai
Publication No. 2008-275266.
Summary of Invention
Technical Problem
[0006] By the way, when the purified air discharge device of a local cleaning
apparatus that discharges purified air is placed on a floor, unpurified air may be entrained
5 by the air flow and dragged in from between the purified air discharge device and floor
surface unless the purified air discharge device and floor surface are in close and airtight
contact. Furthermore, when a guide is attached to the purified air discharge device to
convey the purified air a long distance, unpurified air may be dragged in from between
the purified air discharge device and guide unless the device and guide are in close and
10 airtight contact. As just stated, the purified air discharge device of a local air purifying
device may require some elaboration to install. Then, a purified air discharge device
that can easily be installed is demanded.
[0007] The present invention is invented with the view of the above situation and
an exemplaiy objective of the present invention is to provide a purified air discharge
15 device that can easily be installed.
Solution to Problem
[OOOS] In order to achieve the above objective, the purified air discharge device
according to a first exemplary aspect of the present invention comprises:
a push hood comprising an air flow discharge surface discharging a unifonn
20 purified air flow, wherein
the push hood is provided with a lateral air discharger for creating a purified air
flow that collides against a surrounding wall that is formed as the push hood is installed
and that is situated close along the circumferential direction of the air flow discharge
surface of the push hood.
25 [0009] The purified air discharge device according to a second exemplary aspect of
the present invention comprises:
a push hood comprising an air flow discharge surface discharging a uniform
purified air flow, wherein
the push hood is provided with a lateral air discharger discharging a uniform
purified air flow on all sides of the air flow discharge surface.
[OO 1 01 It is preferable that the lateral air discharger is fotmed across the surface on
5 which the lateral air discharger is provided in the circumferential direction of the air flow
discharge surface.
The push hood comprises, for example, multiple push hoods connected.
It is preferable that the flow rate of the uniform purified air flow discharged from
the air flow discharge surface is 0.1 to 1.0 d s .
10 It is preferable that the flow rate of the uniform purified air flow discharged from
the air flow discharge surface is 0.2 to 0.5 d s .
Advantageous Effects of Invention
[OOl 11 The present invention can provide a purified air discharge device that can
easily be installed.
15 Brief Description of Drawings
[00 121 FIG. 1 is an illustration showing the purified air discharge device of the
present invention;
FIG. 2 is an illustration showing the structure of the push hood;
FIG. 3 is an illustration for explaining the air flow between the prior art push hood
20 and a floor surface;
FIG. 4 is an illustration for explaining the air flow between the push hood of the
present invention and a floor surface;
FIG. 5 is an illustration showing the structure of the push hood of another
embodiment;
2 5 FIG. 6 is an illustration showing the structure of the push hood of another
embodiment;
FIG. 7 is an illustration showing the measuring points in the fluctuation test;
FIG. 8 is an illustration for explaining the device and measuring points in
Embodiments 1 to 4 and Comparative Embodiments 1 to 8;
FIG. 9 is an illustration for explaining the device and measuring points in
Embodiment 5 and Comparative Embodiment 9; and
5 FIG. 10 is an illustration for explaining the measuring points in Embodiment 6.
Description of Embodiments
[00 1 31 The purified air discharge device of the prescnt invention will be described
hereafter with reference to the drawings.
[00 1 41 FIG. 1 shows the purified air discharge device of this embodiment. As
1 0 shown in FIG. 1, a purified air discharge device 1 of this embodiment comprises a push
hood 2.
[OO 1 51 It is basically sufficient that the push hood 2 has at least a mechanism to
discharge a uniform purified air. The push hood 2 can be structured to have a purifying
filter installed in the basic structure of a push hood conventionally used in push-pull
15 ventilators. However, as described later, the push hood 2 is provided with a lateral air
discharger for creating a purified air flow that collides against a surrounding wall that is
formed as the push hood 2 is installed and that is situated close along the circumferential
direction of the air flow discharge surface of the push hood 2 such as a floor surface,
guide, and wall surface.
20 [0016] Here, the uniform air flow and uniform flow are defined as the same as the
unifori-ii flow described in "Plant Ventilation" by Taro Hayashi (published by The
Society of Heating, Air Conditioning, and Sanitary Engineers of Japan, 1982), and means
a uniformly continuous flow of a breeze speed causing no significant swirl. However,
the present invention does not intend to provide an air discharge device precisely defining
25 the air flow rate and air speed profile. Preferably, a uniform air flow has a fluctuation in
speed profile of within rt50 % or even within +30 % from the average value when no
obstacle is present.
[00 1 71 FIG. 2 shows the structure of the push hood 2. As shown in FIG. 2, the
push hood 2 has a housing 21 in the form of a nearly rectangular parallelepiped, on one
side of which an air flow suction surface 22 is formed. The air flow suction surface 22
comprises, for example, a surface in which multiple holes are formed on one entire side
5 of the housing 21. The air flow suction surface 22 introduces the outdoor or indoor air
that is the ambient air outside the push hood 2 fiom the holes. Furthermore, an air
discharge surface 23 is formed on another side of the housing 21 that is opposite to the air
flow suction surface 22. The air discharge surface 23 comprises, for example, a surface
in which multiple holes are formed on one entire side of the housing 21. The air
10 discharge surface 23 discharges a uniform purified air flow formed in the push hood 2 to
the outside of the push hood 2 from the holes. The size of the air flow discharge surface
23 of the push hood 2 is not particularly restricted and, for example, 1050 rnrn x 850 mrn.
Furthermore, the flow rate of the uniform purified air flow discharged from the air flow
discharge surface 23 is preferably 0.1 to 1.0 d s and more preferably 0.2 to 0.5 d s .
15 [0018] A fanning mechanism 24, a high performance filter 25, and a rectifying
mechanism 26 are provided in the housing 2 1.
The fanning mechanism 24 is provided on the side closer to the air flow suction
surface 22 in the housing 21. The fanning mechanism 24 comprises an air discharge fan
or the like. The fanning mechanism 24 introduces the outdoor or indoor air that is the
20 ambient air around the push hood 2 from the air flow suction surface 22 and discharges
an air flow from the air flow discharge surface 23. Furthermore, the fanning mechanism
24 is constructed so that the flow rate of the air flow discharged from the air flow
discharge surface 23 is changeable by controlling the discharge power of the fan.
[0019] The high performance filter 25 is provided between the fanning mechanism
25 24 and rectifying mechanism 26. The high performance filter 25 comprises a high
performance filter corresponding to the purification level such as a HEPA filter (high
efficiency particulate air filter) and ULPA filter (ultra low penetration air filter) for
filtering the introduced ambient air. The high performance filter 25 purifies the ambient
air introduced by the fanning mechanism 24 to purified air of a desired purification level.
The purified air purified by the high performance filter 25 to a desired purification level is
sent to the rectifying mechanism 26 by the fanning mechanism 24.
5 [0020] The rectifying mechanism 26 is provided between the high performance
filter 25 and air flow discharge surface 23. The rectifying mechanism 26 comprises a
not-shown air-resistant body, which is formed by a punching plate or net member. The
rectifjing mechanism 26 corrects (rectifies) the air sent fiom the high performance filter
25 and uneven in airflow across the air flow discharge surface 23 to an equalized air flow
10 even in airflow across the air flow discharge surface 23 (a uniform air flow). The
rectified, uniform air flow is discharged from the entire air flow discharge surface 23 to
the outside of the push hood 2 by the fanning mechanism 24.
[0021] Furthermore, it is preferable that the push hood 2 comprises a pre-filter 27
provided between the air flow suction surface 22 and fanning mechanism 24 in the
15 housing 2 1 as shown in FIG. 2. The pre-filter 27 can be, for example, an intermediate
performance filter. With the pre-filter 27 being provided between the air flow suction
surface 22 and fanning mechanism 24, relatively large coarse particulates contained in the
ambient air introduced in the housing 21 via the air flow suction surface 22 can be
removed. As just stated, since the coarse particulates can be removed in multiple steps
20 depending on the size of coarse particulates contained in the ambient air, the high
performance filter 25, whch is easily clogged, can maintain its performance for a
prolonged time,
[0022] The push hood 2 is provided with a lateral air discharger 28 for creating a
purified air flow colliding against a floor surface (surrounding wall). It is sufficient that
25 the lateral air discharger 28 is structured to discharge part of the uniform air flow rectified
by the rectifying mechanism 26 from the bottom surface of the housing 2 to the floor
surface. For example, as shown in FIG. 2, the lateral air discharger 28 is formed by
multiple holes connecting the rectifying mechanism 26 and the bottom surface of the
housing 2 1.
[0023] Here, it is preferable that the multiple holes of the lateral air discharger 28
are formed across the surface on which the lateral air discharger 28 is provided (the
5 underside in FIG. 2 ) in the circumferential direction (width direction) of the lateral air
discharger 28. Fui-therrnore, it is preferable that the wind speed of the air flow
discharged fiom the lateral air discharger 28 is uniform. Furthe~morei,t is preferable
that the wind speed of the air flow discharged from the air flow discharge surface 23 is
equal to the wind speed of the air flow discharged from the lateral air discharger 28.
10 Furthermore, it is preferable that the distance between the surrounding wall against which
the air flow discharged fiom the lateral air discharger 28 collides and the surface of the
push hood that is situated close to the surrounding wall is constant. With such an
arrangement, it is difficult for the ambient air to enter the area between the lateral air
discharger 28 and floor surface.
I5 [0024] With the push hood 2 having the above structure, the ambient air introduced
by the fanning mechanism 24 is purified by the pre-filter 27 and high performance filter
25 to purified air of a desired purification level. Then, the purified air is rectified by the
rectifying mechanism 26 to a uniform air flow. The uniform purified air flow is
discharged fiom the entire air flow discharge surface 23 to the outside in the direction
20 nearly perpendicular to the air flow discharge surface 23 of the push hood 2.
Furt11el-r-iore, part of the uniform purified air flow is discharged from the lateral air
discharger 28 toward the floor surface in the direction nearly perpendicular to the bottom
surface of the push hood 2.
[0025] With the local air purifying device of the Patent Literature 1, the push hood
25 discharging a uniform purified air flow is installed directly on a desk or the like. When
operated, the vibration of the push hood is transmitted to the desk unless a vibration
absorbing rubber or the like is interposed between the desk and the surface in contact
with the desk. Then, when a vibration absorbing rubber is interposed, a space tends to
be created between the desk and push hood. If a space is created between the desk and
push hood as in this case, as shown in FIG. 3, unpurified air in the room is entrained by
the uniform air flow discharged from the push hood and dragged in the uniform purified
5 air flow.
[0026] On the other hand, the push hood 2 of the present invention is provided on
its bottom surface with the lateral air discharger 28 discharging part of the uniform air
flow rectified by the rectifying mechanism 26, whereby the uniform air flow discharged
from the lateral air discharger 28 collides against the floor surface. As shown in FIG. 4,
10 the uniform air flow discharged from the lateral air discharger 28 collides against the
floor surface, and then part of the collided uniform air flow flows outward from the floor
surface where the collision occurred. Therefore, the air on the side of the air flow
suction surface 22 of the push hood 2 (the ambient air outside the local air purifying
device) does not enter the area between the floor surface and lateral air discharger 28.
15 Then, the cleanliness in the area on the side of the air flow discharge surface 23 of the
push hood 2 is maintained. Hence, it is unnecessary for the purified air discharge device
1 and floor surface to be in close and airtight contact, whereby the purified air discharge
device 1 can easily be installed.
[0027] Here, the distance between the floor surface (surrounding wall) and lateral
20 air discharger 28 (push hood 2) is preferably 50 mm or less and more preferably 20 mm
or less. With this ranges, it is more difficult for the air on the side of the air flow suction
surface 22 of the push hood 2 to enter the area between the floor surface and lateral air
discharger 28, whereby the cleanliness in the area on the side of the air flow discharge
surface 23 of the push hood 2 is maintained.
25 [0028] Furthermore, it is preferable that when a uniform air flow discharged fiom
the lateral air discharger 28 collides against the floor surface (surrounding wall) and the
collided uniform air flow meets with the uniform air flow discharged from the air flow
opening surface 23, the two air flows have a nearly equal wind speed. This is because,
if so, the uniformity of the uniform air flow discharged from the air flow opening surface
23 is maintained.
[0029] As described above, the local air purifying device 1 of this embodinlent is
5 provided with the Iateral air discharger 28 discharging part of a uniform air flow rectified
by the rectifLing mechanism 26 on the bottom surface of the push hood 2, whereby the
ambient air on the side of the air flow suction surfacc 22 of the purified air discharge
device 1 (outside the local air purifying device) does not enter the area between the floor
surface and lateral air discharger 28. Hence, it is unnecessary for the purified air
10 discharge device 1 and a surrounding wall such as a floor surface to be in close and
airtight contact, whereby the purified air discharge device 1 can easily be installed.
[0030] The present invention is not confined to the above-described embodiment
and various modifications and applications are available. Other embodiments
applicable to the present invention will be described hereafter.
15 [0031] In the above-described embodiment, the present invention is described using
the case in which the member situated close to the push hood 2 is a floor. It is sufficient
for the present invention that the lateral air discharger 28 is provided on the surface facing
the member situated close to the push hood 2. For example, as shown in FIG. 5, the
lateral air discharger 28 can be provided to the push hood 2 not only at a position facing
20 the floor surface but also at a position facing a guide 3 provided to the push hood 2. In
such a case, the Iateral air discharger 28 discharging a uniform purified air flow toward
the floor surface is provided on the bottom surface of the push hood 2 and the lateral air
discharger 28 discharging a uniform purified air flow toward the guide 3 is provided on
the side surfaces and top surface of the push hood 2.
25 [0032] If a guide is provided to the push hood of the Patent Literature 1 (for
conveying a uniform purified air flow a long distance), unpurified air is mixed from the
space between the push hood and the guide and contaminates the uniform purified air
flow discharged from the push hood unless airtight connection is made between the push
hood and the guide. On the other hand, the push hood 2 of the present invention is
provided with the lateral air discharger 28 on the surfaces facing the guide 3 and the
purified air is discharged from the lateral air discharger 28. Then, the air pushes and
5 flows outward from between the guide 3 and lateral air discharger 28, whereby the
uniform purified air flow discharged from the air flow discharge surface 23 is not
contaminated. Hence, it is unnecessary for the push hood 2 and the connector to the
guide 3 to be in close and airtight contact, whereby the purified air discharge device 1 can
easily be installed.
10 [0033] Furthermore, if there is a wall situated close to (a side) of the push hood 2.
the lateral air discharger 28 can be provided on the surface facing the wall. In such a
case, it is unnecessary for the push hood 2 and the connector to the wall to be in close and
airtight contact, whereby the purified air discharge device 1 can easily be installed.
[0034] In the above-described embodiment, the present invention is described using
15 the case in which the push hood 2 comprises a single push hood. The push hood 2 can
comprise two or more push hoods. For example, the push hood 2 can comprise four
(two in the vertical direction x two in the horizontal direction) push hoods connected by
connectors. Alternatively, the push hood 2 can comprise nine (three in the vertical
direction x three in the horizontal direction) push hoods connected by connectors.
20 When the push hoods 2 are connected as just stated, the push hoods are arranged so that
the air flow opening surfaces of the push hoods face in the same direction and the short
sides and long sides of the push hoods are next to each other, respectively. For example,
as shown in FIG. 6, the push hood 2 comprises nine push hoods connected by connectors
so that the air flow opening surfaces thereof face in the same direction and the short sides
25 and long sides thereof are next to each other, respectively, the push hoods 2d to 2i of
which the bottom surfaces do not face the installation floor surface can be a push hood
conventionally used in the push-pull ventilators. On the other hand, the push hoods 2a
to 2c of which the bottom surfaces face the floor surface on which the push hood 2 is
installed have the prior art push hood structure and are additionally provided with the
lateral air discharger 28 discharging a uniform purified air flow toward the floor surface.
Also in such a case, with the lateral air discharger 28 being provided at a position facing
5 the bottom surface of the push hood 2, the purified air discharge device 1 can easily be
installed.
[003.5] Furthermore, the push hood 2 can be provided with castors on the bottom
surface. In such a case, the push hood 2 can easily be moved. Needless to say, such a
push hood 2 can be used not only with a local air purifying device but also as a push hood
10 of a push-pull ventilator. Furthermore, the shape of the push hood 2 is not restricted to
nearly rectangular parallelepipeds.
Embodiments
[0036] Specific embodiments of the present invention will be given hereafter to
fkther describe the present invention.
15 [0037] First, it was checked whether the wind speed of the air flow discharged from
the air flow discharge surface 23 fluctuated as a result of an air flow discharged from the
lateral air discharger 28 of the push hood 2. Under different wind speeds of 0.2 to 0.5
rnls, the wind speed was measured at the measuring points shown in FIG. 7 when an air
flow waslwas not discharged toward the floor surface from the lateral air discharger 28
20 provided on the underside of the push hood 2. The air flow discharge surface 23 of the
push hood 2 was 300 mm in height and 500 mm in width. The lateral air discharger 28
discharged an air flow of 10 rnrn in width. The push hood 2 was provided with
vibration absorbing subber pieces at four points (not shown) on the surface in contact
with the floor surface. The distance between the floor surface and the surface of the
25 push hood 2 that is situated close to the floor surface was approximately 5 rnrn. Table 1
shows the results when the lateral air discharger 28 discharged no air flow. Table 2
shows the results when the lateral air discharger 28 discharged an air flow.
[0038] [Table 11
[0039] [Table 21
set wind speed
(ds)
0.5 ,
0.4
0.3
0.2
[0040] As shown in Tables 1 and 2, it was confirmed that whether an air flow is or
5 is not discharged from the lateral air discharger 28, the wind speed of the air flow
discharged from the air flow discharge surface 23 does not fluctuate.
[004 11 (Embodiments 1 to 4 and Comparative Embodiments 1 to 8)
As shown in FIG. 8, the purified air discharge device 1 of the present invention
was installed on a table T in the manner that the air flow discharge surfaces 23 of the
10 push hoods 2 face each other. The cleanliness level was measured on Surfaces A (L/2),
B (L/3), and C (Ll6) under different air speeds and with different distances L between the
push hoods 2. In these embodiments, an air flow was discharged from the air flow
discharge surface 23 and an air flow was discharged toward the floor surface from the
lateral air discharger 28 provided on the underside of the push hood 2. The cleanliness
15 level was measured at a total of nine points that are the midpoints of trisected areas on
each surface. For measuring the cleanliness level, the number of coarse particulates of
0.3 pm in particle size (counts1CF) was measured using LASAIR-I1 manufactured by
PMS. The cleanliness levels of 300 countsICF and lower were assumed to be highly
clean. Tables 3 to 6 show the results. Additionally, Tables 7 to 10 show the results
20 when no air flow was discharged fi-om the lateral air discharger 28 (Comparative
average wind speed
(m/s>
0.5 1
0.40
0.29
0.22
set wind speed
(m/s>
0.5
0.4
0.3
0.2
fluctuation
upper limit (96)
17.8
18.0
20.2
20.8
average wind speed
(mls>
0.48
0.41
0.29
0.2 1
fluctuation lower
limit (%)
16.4
19.8
22.8
22.2
fluctuation
upper limit (%)
18.8
22.8
19.8
22.6
fluctuation lower
limit (%)
15.1
18.0
18.8
19.6
Embodiments 1 - 4).
[0042 1 [Table 31
wind speed 0.5 rnls, L=850 mm
Surface A
[0043] [Table 41
Surface B
wind speed 0.4 mls, L=700 mm
Surface B
[0044] [Table 51
wind speed 0.3 mls, L=600 mm
Surface A Surface B
[0045] [Table 63
wind speed 0.2 d s , L=600 mm
Surface C
Surface C
Surface C
Surface A Surface B Surface C
[0046] [Table 71
wind speed 0.5 mls, L=550 mm
Surface A Surface B Surface C
[0047] [Table 81
wind speed 0.4 m/s, L=550 mm
Surface A Surface B Surface C
[0048] [Table 91
wind speed 0.3 mls, L=550 mm
Surface A
[0049] [Table 101
wind speed 0.2 mls, L=550 mm
Surface C
Surface A Surface B Surface C
[OOSO] As shown in Tables 7 to 10, when no air flow was discharged from the
lateral air discharger 28 of the push hood 2, poor cleanliness results were obtained in the
lower regions of all Surfaces A to C with the distance L between the push hoods 2 of 550
mm. On the other hand, as shown in Tables 3 to 6, when an air flow was discharged
from the lateral air discharger 28 of the push hood 2, excellent cleanliness results were
5 obtained even when the distance L between the push hoods 2 was hrther extended.
Hence, it was confirmed that the purified air discharge device 1 can easily be installed.
1005 11 (Embodiment 5 and Comparative Embodiment 9)
As shown in FIG. 9, using the purified air discharge device 1 of which the push
hood 2 was provided with the guide 3 of 12 m in length and with the lateral air discharger
10 28 on all sides of the air flow discharge surface (fi-ont discharge surface) 23 of the push
hood 2 (side discharge surface (top), side discharge surface (bottom), side discharge
surface (left), and side discharge surface (right)), the cleanliness was measured at a
position (plane) of 6 m away from the push hood 2. In this embodiment, nine (three in
the vertical direction x, three in the horizontal direction) push hoods 2 were arranged and
15 connected in the manner that the air flow opening surfaces thcreof faced in the same
direction and the short sides and long sides of the push hood 2a were next to each other,
respectively. Additionally, in this embodiment, an air flow was discharged from the air
flow discharge surface 23 and an air flow was discharged fiom the lateral air discharger
28. The wind speed of the air flow was 0.2 d s . The measuring points were a total of
20 six midpoints of trisected areas at heights of 1/2 (upper) and 1/6 (lower) of the overall
height. The cleanliness was measured as in Embodiments 1 to 4. Table 11 shows the
results. Additionally, Table 12 shows the results when no air flow was discharged from
the lateral air discharger 28 (Comparative Embodiment 5).
[0052] [Table 111
_ Upper
Lower
number of coarse particulates (counts/CF)
a
0
4
b
0
0
c
0
6
[0053] [Table 121
[0054] As shown in Tables 1 1 and 12, it was confirmed that excellent cleanliness
results are obtained by discharging an air flow from the lateral air discharger 28. Hence,
upper
lower
5 it was confirmed that the purified air discharge device 1 can easily be installed even when
the push hood 2 of the purified air discharge device 1 is provided with the guide 3,.
[0055] (Embodiment 6)
As in Embodiment 5, using the purified air discharge device I shown in FIG. 9, the
cleanliness was measured at two points in the lateral top (measuring point 1) and lateral
10 bottom (measuring point 2) inside the guide 3 shown in FIG. 10 between the push hood 2
and guide 3. In this embodiment, an air flow was discharged from the air flow
discharge surface 23 and an air flow was discharged from the lateral air discharger 28.
number of coarse particulates (counts/CF)
The wind speed of the air flow was 0.3 mls. For comparison, the cleanliness was
a
956
1257
measured at points in the lateral top (measuring point 3) and lateral bottom (measuring
15 point 4) outside the purified air discharge device 1 (outside the guide). The cleanliness
b
0
859
was measured as in Embodiments 1 to 5. Furthermore, the wind speed was measured at
c
1341
1017
the measuring points 1 and 2. Table 13 shows the results.
[0056] [Table 131
/ number of coarse 1 number 1 ' of coarse
20 COO571 As shown in FIG. 13, excellent cleanliness results were obtained in regard to
position
lateral top
lateral
between the push hood 2 and guide 3. Furthermore, it was confirmed that the wind
particulates inside
guide (counts/m3)
0
(measuring point 1)
0
(measuring point 2)
particulates outside
guide (counts/m3)
170,029,400
(measuring point 3)
234,258,200
(measuring point 4)
wind speed (rnls)
0.29
(measuring point 1)
0.30
(measuring point 2)
speed of the air flow does not change. Hence, it was confirmed that the purified air
discharge device 1 can easily be installed even when the push hood 2 of the purified air
discharge device 1 is provided with the guide 3.
[0058] This application is based on Japanese Patent Application No. 201 1-21 9659,
5 filed on October 3,201 1, and Japanese Patent Application No. 20 12- 1 16855, filed on
May 22,20 12. The entire specification, scope of claims, and drawings of the Japanese
Patent Application Nos. 201 1-219659 and 2012-1 16855 are incorporated herein by
reference.
Industrial Applicability
10 [0059] The present invention is useful for purified air discharge devices.
Reference Signs List
[0060] 1 Purified air discharge device
2 Push hood
21 Housing
15 22 Air flow suction surface
23 Air discharge surface
24 Fanning mechanism
25 High performance filter
26 Rectifying mechanism
28 Lateral air discharges

WE CLAIM:
1. A purified air discharge device, comprising a push hood comprising an air
flow discharge surface discharging a uniform purified air flow, wherein
the push hood is provided with a lateral air discharger for creating a purified air
5 flow that collides against a surrounding wall that is formed as the push hood is installed
and that is situated close along the circumferential direction of the air flow discharge
surface of the push hood.
2. A purified air discharge device comprising a push hood comprising an air
flow discharge surface discharging a uniform purified air flow, wherein
the push hood is provided with a lateral air discharger discharging a uniform
purified air flow on all sides of the air flow discharge surface.
3. The purified air discharge device according to Claim 1 or 2, wherein
the lateral air discharger is formed across the surface on which the lateral air
discharger is provided in the circumferential direction of the air flow discharge surface.
4. The purified air discharge device according to any one of Claims 1 to 3,
wherein
the push hood comprises multiple push hoods connected.
5. The purified air discharge device according to any one of Claims 1 to 4,
wherein
20 the flow rate of the uniform purified air flow discharged from the air flow
discharge surface is 0.1 to 1.0 ids.
6. The purified air discharge device according to any one of Claims 1 to 4:
wherein
the flow rate of the uniform purified air flow discharged from the air flow
25 discharge surface is 0.2 to 0.5 ids.
Dated this sthd ay of April 2014
Of Anand and Anand Advocates
Agent for the Applicant