Ventilation – Having forced recirculation – Including unitary housing having both inlet and outlet airways
Reexamination Certificate
2000-11-07
2003-04-22
Boles, Derek (Department: 3743)
Ventilation
Having forced recirculation
Including unitary housing having both inlet and outlet airways
C454S233000
Reexamination Certificate
active
06551185
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an air intake and blowing device capable of forming a spiral swirl flow of air to be sucked in and blown.
BACKGROUND ART
In general, as a method for discharging air from a specified local place, an air intake and blowing device for generating a spiral intake air swirl flow is used in relation to the air to be blown.
As an example, Japanese Patent Laid-Open Publication No. SHO 64-38540 discloses a device for blowing an air flow from four posts to generate a spirally rising swirl flow within a space partitioned by air curtains and causing an air intake effect in a direction perpendicular to the swirl flow in a center portion of the space.
However, the above-mentioned device has the problem that the four posts are required to be installed and is restricted in terms of installation space.
In view of the above, as an air intake and blowing device eliminating the posts as described above, there are proposed devices disclosed in, for example, Japanese Patent Laid-Open Publication No. HEI 4-140, Japanese Patent Laid-Open Publication No. HEI 9-25889 and Japanese Patent Laid-Open Publication No. HEI 8-75208.
First, according to the Japanese Patent Laid-Open Publication No. HEI 4-140, in an exhaust system in which an exhaust hood is provided in an upper portion of a space from which exhaust is to be discharged, an exhaust port connected to an exhaust fan is formed in a center portion of the exhaust hood, a spirally rising vortex air flow is generated below the surface of the exhaust hood by the blowing air and a negative pressure from the exhaust port obtained by blowing air in a tangential direction of a circumference concentric with the center of the exhaust port and discharge of air inside the space from which exhaust is to be discharged is performed by the vortex air flow, an air supply chamber is fixed to an outer peripheral portion located in a lower portion of the exhaust hood and is to be discharged is performed by the vortex air flow so as not to disturb the vortex air flow by alternately arranging at regular intervals air blowing ports for blowing air in a tangential direction of a circumference concentric with the center of the exhaust port and fixed air blowing ports for blowing air toward the surface of the downside floor surface on the lower surface of the exhaust chamber and blowing air from the air blowing ports toward the floor surface.
Next, the device of Japanese Patent Laid-Open Publication No. HEI 9-25889 has a construction employing a centrifugal air blower constructed so that air is sucked from an air intake port by the rotation of an impeller and the air is discharged from inside the impeller to the outer periphery, wherein a pipe section that extends downward in the rotating axis direction from an end surface located on the intake side of the impeller and a propeller that rotates together with the impeller and generates a swirl air flow cylindrically enclosing the periphery of the intake air flow sucked into the intake port is provided on the outer peripheral surface of this pipe section.
Furthermore, the device of Japanese Patent Laid-Open Publication No. HEI 8-75208 has a construction including an exhaust passage having a circular air intake port, an air supply passage in which an air blowing port is arranged in an annular shape so as to form a concentric circle outside the air intake port, a plurality of air flow guide vanes that are elongated in a direction of the annular passage inside the annular passage of the air supply passage and are arranged so as to divide the annular direction of the annular passage and a swirl air flow guide hood that is widen toward the end and protruded so as to form a circle concentric with the air intake port of the exhaust passage on the outer periphery of the air blowing port of the air supply passage, wherein the exhaust passage and the air supply passage are positioned on the same side of the planes of the air intake port and the air blowing port, the air flow guide vanes are constructed so as to be wholly turned aslant in an identical direction relative to the direction of center axis of the intake air flow caused by the intake of air of the air intake port of the exhaust passage, and a swirl air flow turned aslant in the reverse direction relative to the air intake direction of the air intake port by the guide vanes is blown outwardly of the periphery of the air intake port from the annular air blowing port located around the air intake port.
The aforementioned prior art examples have the problems as follows.
That is, in the case of Japanese Patent Laid-Open Publication No. HEI 4-140, it is required to provide the air supply chamber having an outer diameter corresponding to the circumference of the exhaust hood having a great opening diameter continued to the exhaust duct and arrange a number of air blowing ports for blowing air in the tangential direction relative to the center of the exhaust port and air blowing ports for blowing air toward the downside floor surface in the air supply chamber. Therefore, a large-scale complicated device construction including the exhaust duct is needed, for which loud noises are generated and the device can only be used as a spot exhaust device for large-scale installations such as factories.
Therefore, this device is not suitable for devices such as air conditioners and air purifiers that are required to be compact and comfortable.
Next, the device of Japanese Patent Laid-Open Publication No. HEI 9-25889, which can cope with the requirement of comfortableness though not quite satisfactorily, can be applied to only a duct system ventilating device. Furthermore, it is required to provide a supply air fan extended downward from the air intake port of the exhaust fan, and therefore, compacting of the device is hard to achieve.
Next, the device of Japanese Patent Laid-Open Publication No. HEI 8-75208, which needs a large vortex flow guide hood around the outlet port, has a complicated structure. There is a further problem that the device can only be applied to the duct type ventilating device.
The generation of the tornado flow that flows toward the air intake port and exerts a great influence on the air intake and blowing operation requires the essential condition that the vortex flow blown from the air blowing port surrounding the tornado flow is stably generated.
As shown in
FIG. 42
, the vortex flow that is a factor for generating the tornado flow is blown from an annular air blowing port
152
formed in an outer peripheral portion of a panel member
151
positioned on the lower surface of the air intake and blowing device. In this case, an air blowing passage
153
continued to the air blowing port
152
has an inclined cross-section shape inclined radially outwardly toward an air blowing side surface
151
a
of the panel member
151
, and a plurality of vortex flow creating stators (fixed vanes)
155
for imparting a swirl component to the blowing air are mounted at regular intervals in the circumferential direction inside the air blowing passage
153
. Then, by the swirl component imparting effect of the vortex flow creating stators
155
, the blowing air becomes a vortex flow that is spirally blown out of the air blowing port
152
.
In this case, in order to make the air blown from the air blowing port
152
become a stable vortex flow, the air flow direction is desired to be extended in a direction of extension of the air blowing passage
153
, as indicated by a stream line A
01
in the figure. However, if the air intake and blowing device is a ceiling embedded type, then, due to the existence of an outside ceiling
154
forming a plane roughly identical to that of the panel member
151
on which the air blowing port
152
is opened, Coanda effect is exerted on the blowing air by a portion located outside the air blowing port
152
of the panel member
151
and the ceiling
154
continued to the portion. Therefore, the air flow blown from the air blowing port
152
receives the effect that it adheres to the ceiling
154
and is diff
Iwata Toru
Kamada Masashi
Kikuchi Yoshimasa
Miyake Kunihiko
Birch & Stewart Kolasch & Birch, LLP
Boles Derek
Daikin Industries Ltd.
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