Fluid sprinkling – spraying – and diffusing – Container for non-fluid material – and scattering means – With means generating or supplying gaseous mixing current
Reexamination Certificate
2002-04-24
2004-08-17
Mar, Michael (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Container for non-fluid material, and scattering means
With means generating or supplying gaseous mixing current
C239S659000, C239S102100, C239S143000, C222S195000, C222S494000
Reexamination Certificate
active
06776361
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a powdered material spraying device, more particularly to a powdered material spraying device having an elastic membrane with a penetrating aperture, and more specifically to a powdered material spraying device which may improve the discharge property of a powdered material from the penetrating aperture provided for the elastic membrane.
BACKGROUND ART
The inventors of the present invention have already proposed a minute powder spraying device utilizing an elastic membrane with a penetrating aperture in JP-A-8-161553 as powder material spraying means for quantitatively spraying a powdered material.
FIG. 19
shows a diagrammatic configuration of the spraying device. The spraying means
201
is provided for a material discharge port
202
a
of a powdered material storage hopper
202
for storing a powdered material so as to form a bottom of the hopper
202
and is provided with an elastic membrane
232
having a penetrating aperture
232
a
and with a pneumatic transport pipe T. A cover
202
c
is detachably and airtightly provided for a material charge port
202
b
of the material storage hopper
202
.
The material discharge port
202
a
of the material storage hopper
202
is connected with the pneumatic transport pipe T so as to interpose the elastic membrane
232
in midstream of the pneumatic transport pipe T.
The penetrating aperture
232
a
provided for the elastic membrane
232
is a slit in this embodiment.
One end Ta of the pneumatic transport pipe T is connected to positive pulsating vibration air generation means
221
. When the generation means
221
is driven, the generated positive pulsating vibration air is supplied to the pneumatic transport pipe T from the end Ta.
Next, the operations of the minute powder spraying means
201
will be explained hereinafter.
FIG. 20
is a diagrammatic explanatory view how the elastic membrane
232
of the spraying means
201
operates.
For spraying a fixed amount of powdered material from the other end Tb of the pneumatic transport pipe T by means of the spaying means
201
, a powdered material is stored in the material storage hopper
202
. Then the cover
202
c
is airtightly attached on the material charge port
202
b
of the powder material storage hopper
202
.
Next, a positive pulsating vibration air is supplied to the pneumatic transport pipe T by driving the positive pulsating vibration air generation means
221
.
According to the spraying means
201
, when the positive pulsating vibration air is supplied to the pneumatic transport pipe T, the pressure in the pneumatic transport pipe T increases at a peak amplitude of the pulsating vibration air, and the elastic membrane
232
is deformed to curve its center upwardly. In this case, the penetrating aperture
232
a
is shaped like a letter V in such a manner that the top is opened seen in section. A part of the powdered material stored in the storage hopper
202
falls in the V-shaped penetrating aperture
232
a
(see
FIG. 20
a
).
As the positive pulsating vibration air supplied to the pneumatic transport pipe T is directed to the valley of the amplitude and the pressure in the pneumatic transport pipe T is gradually reduced, the elastic membrane
232
returns to its original shape from the upwardly curved shape because of its restoring force. At the same time the V-shaped aperture
232
a
is returned to its original shape and the powdered material dropped in the V-shaped aperture
232
a
is caught in the aperture
232
a
(see
FIG. 20
b
).
Then the positive pulsating vibration air supplied to the pneumatic transport pipe T comes to be its valley of the amplitude and the pressure in the pneumatic transport pipe T is reduced, the elastic membrane
232
is elastically deformed with the center curved downwardly. In this time the penetrating aperture
232
a
forms like a reverse V-shape in such a manner that the lower end is opened seen in section, and the powdered material caught in the aperture
232
a
falls in the pneumatic transport pipe T (see
FIG. 20
c
).
The powdered material dropped in the pneumatic transport pipe T is mixed with and dispersed in the positive pulsating vibration air supplied in the pipe T.
The dropped material in the pipe T is pneumatically transported to the other end Tb of the pipe T to be sprayed with the positive pulsating vibration air therefrom.
The vibration of the elastic membrane
232
of the minute powder spraying means
201
depends on the positive pulsating vibration air supplied in the pipe T. The amount of powdered material supplied via the penetrating aperture
232
a
to the pneumatic transport pipe T is primary determined by the vibration of the elastic membrane
232
. Therefore, a fixed amount of powdered material is discharged to the pneumatic transport pipe T as long as the positive pulsating vibration air supplied to the pneumatic transport pipe T is constant.
A positive pulsating vibration air, not a constant air flow, is designed to be supplied to the pneumatic transport pipe T. Therefore, the powdered material in the pneumatic transport pipe T doesn't cause accumulation and pinhole, which have been seen when a powdered material is pneumatically transported at a steady air flow in the pipe T to the other end Tb.
Accordingly, almost all of the powdered material supplied to the pneumatic transport pipe T via the penetrating aperture
232
a
of the elastic membrane
232
is sprayed from the other end Tb of the pneumatic transport pipe T.
The powder material spraying means
201
has a beneficial effect such that a fixed amount of powdered material can be always sprayed from the other end Tb of the pneumatic transport pipe T as long as the positive pulsating vibration air supplied in the pipe T is constant. Furthermore, the spraying means
201
has a beneficial effect wherein the concentration of the powdered material sprayed from the other end Tb of the pneumatic transport pipe T can be easily changed because it can be varied depending on the positive pulsating vibration air supplied from the one end Ta of the pipe T.
However according to this spraying means
201
, air is fed in the powdered material storage hopper
202
from the pneumatic transport pipe T through the penetrating aperture
232
a
of the elastic membrane
232
, and the powdered material is discharged from the storage hopper
202
through the penetrating aperture
232
a
of the elastic membrane
232
.
The air flow to the storage hopper
202
from the pneumatic transport pipe T and the discharge of the powdered material in the pneumatic transport pipe T from the hopper
202
, both of which are done via the penetrating aperture
232
a
of the elastic membrane
232
, utilize reverse air flows respectively. The pressure in the pneumatic transport pipe T is higher than that in the storage hopper
202
at a time of driving. The elastic membrane
232
is apt to expand into a direction of the storage hopper
202
(upwardly) till a balanced condition immediately after driving. Therefore, the amount of the powdered material discharged from the penetrating aperture
232
a
of the elastic membrane
232
is reduced so that the amount of material sprayed from the other end Tb of the pneumatic transport pipe T is subject to be reduced.
It has been found that when the charge amount of powdered material in the storage hopper
202
is varied, the amount of powdered material sprayed from the other end Tb of the pneumatic transport pipe T has been varied, thereby deteriorating its quantitativeness.
According to the minute powder spraying means
201
, the quantitativeness of powdered material sprayed from the other end Tb of the pneumatic transport pipe T depends on the vertical vibration pattern of the elastic membrane
232
. Therefore, even though the positive pulsating vibration air is accurately generated, the elastic membrane
232
doesn't execute an accurate reproductive movement for the positive pulsating vibration air in case that the elastic membrane
232
having the penetrating aperture
232
a
provided at the discharge
Hayakawa Kimiaki
Morimoto Kiyoshi
Watanabe Yasushi
Fitzpatrick ,Cella, Harper & Scinto
Gorman Darren
Kyowa Hakko Kogyo Co. Ltd.
Mar Michael
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