Suction and exhaust device

Details Suction and exhaust device Suction and exhaust device

2002-04-26

2003-09-16

Joyce, Harold (Department: 3749)

Ventilation

Workstation ventilator

Having inlet airway

C126S29900R, C454S189000

Reexamination Certificate

active

06620038

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an air supply and exhaust apparatus that forms air curtain flow surrounding outer circumference of a specified local region and that exhausts air in the local region inside the air curtain flow by sucking the air in a direction opposite to the air curtain flow.
BACKGROUND ART
As ventilating apparatus for ventilating a specified local region, for example, the inventor and others have already proposed apparatus that supply airflow like air curtain surrounding the local region while suck and exhaust air in the local region inside the air curtain flow.
FIG. 13
shows an example of the apparatus.
In
FIG. 13
, reference numeral
4
denotes a fresh-air supply chamber that is, for example, generally conical in shape and that is provided over the local region. Immediately beneath the fresh-air supply chamber
4
, a suction hood
10
shaped like a dome having a comparatively shallow depth and spreading along a direction of exhaust is detachably provided a specified distance apart from the chamber so as to have an opening edge
10
d
projecting downward from a bottom opening surface of the fresh-air supply chamber
4
by a specified size. Between the fresh-air supply chamber
4
and the suction hood
10
inside the chamber, as a result, a supply air swirling space having passage diameters increasing gradually along a traveling direction is formed for guiding toward an air outlet
3
fresh air introduced through a fresh-air introducing port
5
a
of a fresh-air supply duct (supply air duct)
5
that will be mentioned later while swirling the fresh air effectively. In the supply air swirling space, airflow to be supplied to the air outlet
3
is previously formed into swirl flow having specified flow velocities.
Above the suction hood
10
in the supply air swirling space is provided a straightening plate
6
having a large number of airflow straightening holes
6
a
,
6
a
, . . . for straightening swirl flow formed as described above and for equalizing distribution of flow velocity of the swirl flow. The straightening plate
6
is formed of, for example, a punching plate, and outside and inside edges of the plate are fixed to the fresh-air supply chamber
4
and to a sleeve (coupling member)
20
surrounding a suction duct
2
that will be described later, by the medium of ring-like corner brackets
61
and
62
, respectively.
The curved fresh-air introducing port
5
a
at an end of the fresh-air supply duct
5
is connected to and communicates with the fresh-air supply chamber
4
so as to introduce fresh air supplied from the outdoors in oblique tangential directions (swirling directions). The suction duct
2
is connected to and communicates with the suction hood
10
, and the suction duct
2
is introduced downward through a top plate (apex)
4
a
of the fresh-air supply chamber
4
and extends (projects) cylindrically so that a suction port
2
a
at a lower end of the duct
2
is positioned in the vicinity of a surface of an air-collecting opening
10
a
of the suction hood
10
. A fresh-air inlet end of the fresh-air supply duct
5
and an inside-air exhaust end of the suction duct
2
extend outdoors. At the ends extending outdoors (not shown) of the fresh-air supply duct
5
and the suction duct
2
are provided a fresh-air supply fan (air supply fan) and a suction fan (exhaust suction fan), respectively, that are composed of, for example, multiblade fans (sirocco fans). Those fans are driven so as to perform corresponding functions of supplying fresh air and sucking exhaust.
The sleeve
20
that can be penetrated by the suction duct
2
is fitted on the outer circumference of the suction duct
2
in the supply air swirling space. Besides the straightening plate
6
, swirl flow generating stators
30
a
,
30
a
, . . . and the suction hood
10
are integrated with the fresh-air supply chamber
4
through the medium of the sleeve
20
, as will be described later.
The suction duct
2
is inserted into the sleeve
20
, the position of the suction port
2
a
is then set suitably as described above, and the duct is thereafter fixed.
On the circumference of the suction duct
2
and above the suction port
2
a
are provided auxiliary suction ports
2
b
,
2
b
, . . . for sucking inside air collected in the suction hood
10
. At a lower end of the suction port
2
a
is provided an oil sump
7
having an oil sump groove
7
a
and having a cross section shaped like a letter U.
The air outlet
3
has a passage with a specified length, for example, between an inner circumferential surface of the fresh-air supply chamber
4
on the side of a lower end
4
b
and an outer circumferential surface of a shoulder
10
c
of the suction hood
10
, has an all-around continuous annular opening, and is slantingly formed with a specified tilt angle so that center diameters of the outlet gradually expand toward the lower end of the outlet. In the air outlet passage are arranged a large number of swirl flow generating stators
30
a
,
30
a
, . . . that extend spirally downward with a specified tilt angle (radial angle) and that are spaced at specified intervals circumferentially.
The swirl flow generating stators
30
a
,
30
a
, . . . are formed as follows, in shape of gentle circular arcs each having specified length and width and extending parabolically with a specified radial angle. An outer circumferential edge of a flat circular metal plate
30
having a center aperture to be fitted on the sleeve
20
is slit parabolically and cut into strips in accordance with a number of the swirl flow generating stators
30
a
,
30
a
, . . . to be provided, and the cut strips are bent to a specified angle at specified positions (positions on radial lines) on the side of a main body
30
b
of the flat metal plate
30
. The sleeve fitting aperture, that is, an inner circumference of the main body
30
b
of the flat metal plate is fitted and mounted from above on a lower end flange
20
a
of the sleeve
20
on the outer circumference of the suction duct
2
, is positioned with use of round slots, and is fixed by screws, so that the swirl flow generating stators
30
a
,
30
a
, . . . are properly installed in the air outlet passage of the air outlet
3
.
On underside of the lower end flange
20
a
of the sleeve
20
that supports the flat plate main body
30
b
of the swirl flow generating stators
30
a
,
30
a
, . . . in such a manner, a top plate section
10
b
of the dome-shaped suction hood
10
is integrally mounted by detachable mounting means such as slide engagement method so that attachment or detachment of the hood can easily be performed with an operation from below.
That is, attachment of the suction hood
10
is achieved, for example, as follows. On underside of the lower end flange
20
a
of the sleeve
20
, hooked engaging pieces
13
,
13
, . . . each having a specified vertical gap are provided. On the side of the top plate
10
b
of the suction hood
10
, on the other hand, rectangular engaging holes are provided. The engaging pieces
13
,
13
, . . . are arbitrarily fitted into the engaging holes, the hood is then slid and turned by a specified turning angle from the fitting position in a circumferential direction, and side edges of the holes thereby come into the gaps so as to achieve overlap engagement with completion of positioning of the hood. The hood is fixed by screws in the engagement position.
When the fresh-air supply fan on the side of the fresh-air supply duct
5
and the suction fan on the side of the suction duct
2
in the above configuration are driven, for example, fresh air guided into the fresh-air introducing port
5
a
through the fresh-air supply duct
5
is initially blown out into the supply air swirling space in tangential directions by a blast pressure from the fresh-air supply fan. The air is straightened by the straightening holes
6
a
,
6
a
, . . . of the straightening plate
6
while being swirled efficiently in the supply air swirling space, and resultant stable swirl flow with equalized flow velocities is supplied to th

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