Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2000-07-19
2002-01-22
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S230000, C417S312000
Reexamination Certificate
active
06340069
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sound elimination structure for an air pump which is especially used in an aquarium.
2. Description of the Related Art
A conventional air pump
10
for an aquarium in accordance with the prior art shown in
FIG. 1
comprises a body
11
including an air inlet chamber
111
having an air inlet hole
113
forming a receiving recess
115
, an air outlet chamber
112
having an air outlet hole
114
forming a receiving recess
115
, an air suction hole
116
defined in the body
11
, an air drain pipe
117
mounted on the body
11
, a bottom cap
15
mounted on the body
11
, a compression cup
12
mounted on the body
11
, a vibration crank
13
mounted on the compression cup
12
, a magnet
131
mounted on one end of the vibration crank
13
, two anti-reverse structures
14
each received in the receiving recess
115
and each including an anti-reverse diaphragm
142
releasably encompassing the air inlet hole
113
and the air outlet hole
114
, and a press block
141
pressing the anti-reverse diaphragm
142
.
In operation, when the air pump
10
is energized, the magnet
131
is attracted or repelled by an electromagnetic device (not shown) to force the vibration crank
13
to vibrate so that the compression cup
12
can be pressed to move toward the body
11
, and can be expanded to move opposite to the body
11
. When the compression cup
12
is expanded to move opposite to the body
11
, the environmental air is drawn into the air inlet chamber
111
through the air suction hole
116
and the air inlet hole
113
. The anti-reverse diaphragm
142
is used to prevent the air from flowing back. When the compression cup
12
is pressed to move toward the body
11
, the air is forced to flow through the air outlet hole
114
into the air outlet chamber
112
, and is finally carried to the ambient environment through the air drain pipe
117
. However, the travel path of the flowing air is very short, and the flowing air has a great velocity so that the flowing air easily create noise in the air pump
10
.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a sound elimination structure for an air pump comprising: a body, a compression cup, a vibration crank, and two anti-reverse structures, wherein, the body is separated into an air inlet chamber and an air outlet chamber and has a first side provided with a washer and a cover plate and a second side provided with a flange, the air inlet chamber is provided with an air input hole and an air inlet hole, the air outlet chamber is provided with an air output hole and an air outlet hole, the vibration crank has a first side secured on the compression cup which is mounted on the lug and a second side provided with a magnet co-operating with an external electromagnetic device, each of the air input hole and the air output hole defines a recess for receiving an anti-reverse structure, the improvement comprising:
the body provided with a sound elimination device which comprises an air chamber box, and an air chamber cover, wherein,
the air chamber cover is provided on one side of the body, and is separated by a plurality of baffles into a first chamber, a second chamber, a third chamber, and a fourth chamber, an air inlet guide hole defined in the first chamber and connecting to an external air extraction hole, an air inlet chamber air inlet hole defined in the second chamber and connecting to the air inlet chamber of the body, an air outlet chamber air outlet hole defined in the third chamber and connecting to the air outlet chamber of the body, an air conveying hole defined in the fourth chamber and connecting to an air outlet tube of the body, a guide hole defined between the first chamber and the second chamber; and
the air chamber box is separated by a plurality of baffles into an air inlet cabin, a first circuitous chamber, a second circuitous chamber, and an air guide chamber, each of the first circuitous chamber and second circuitous chamber provided with a catch plate which is fitted in the air inlet chamber air inlet hole and the air outlet chamber air outlet hole, and a guide hole defined between the second circuitous chamber and the air guide chamber.
In accordance with another aspect of the present invention, wherein,
the air chamber cover is separated by a plurality of baffles into a first chamber, a second chamber, a third chamber, and a fourth chamber, the third chamber connecting to the fourth chamber, an air guide tube mounted in the first chamber and connecting to an external air extraction hole, an air inlet chamber air inlet hole defined in the second chamber and connecting to the air inlet chamber of the body, an air outlet chamber air outlet hole defined in the third chamber and connecting to the air outlet chamber of the body, an air conveying hole defined in the fourth chamber and connecting to an air outlet tube of the body, a guide hole defined between the first chamber and the second chamber; and
the air chamber box is separated by a plurality of baffles into an air inlet cabin, a first circuitous chamber, a second circuitous chamber, and an air guide chamber, a first lug mounted in the air inlet cabin and loosely fitted in the air guide tube of the first chamber of the air chamber cover, and a second lug mounted in the first circuitous chamber and loosely fitted in the air inlet chamber air inlet hole of the second chamber of the air chamber cover.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 5137432 (1992-08-01), Tsai
patent: 5137433 (1992-08-01), Willinger et al.
patent: 5711656 (1998-01-01), Tsai
Dang Khanh
Meiko Pet Corporation
Rosenberg , Klein & Lee
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