Combustion – Heated line section feeds flame holder – Fuel conduit within flame or combustion products zone
Reexamination Certificate
2000-01-05
2001-04-10
Lazarus, Ira S. (Department: 3743)
Combustion
Heated line section feeds flame holder
Fuel conduit within flame or combustion products zone
C431S264000, C431S266000
Reexamination Certificate
active
06213760
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a so-called outdoor portable gas cooking stove, and more particularly, to a burner structure of a portable gas cooking stove.
2. Description of the Related Art
FIG. 1
shows an example of a portable gas cooking stove known in the art.
Normally, the portable gas cooking stove
10
includes a gas cartridge
11
filled with compressed combustible gas, and a gas burner
12
mounted detachably on the gas cartridge
11
. The gas cartridge
11
and the gas burner
12
are coupled to each other in a hermetically sealed condition through a gasket
13
.
The gas burner
12
is comprised of a plug fitting
14
which is connected to the gas cartridge
11
and through which combustible gas supplied from the gas cartridge
11
passes, a gas flow adjusting spindle
15
which adjusts a degree of opening of a gas passage formed inside the plug fitting
14
to thereby adjust a flow of the combustible gas passing through the plug fitting
14
, a burner head
16
with a number of openings
16
a formed on a surface thereof, a mixing tube
17
connecting the plug fitting
14
to the burner head
16
, kettle holders
18
that are fixed on the mixing tube
17
and extend over the burner head
16
, and an igniter
19
mounted on a support
19
a.
The combustible gas is filled in the gas cartridge
11
in a pressurized condition. Hence, when the gas passage is opened by the gas flow adjusting spindle
15
, the combustible gas in a pressurized condition enters the mixing tube
17
from the gas cartridge
11
through the plug fitting
14
. Thus, the combustible gas enters the mixing tube
17
with a gas flow thereof being adjusted by the gas flow adjusting spindle
15
.
The mixing tube
17
is formed with a number of openings
17
a
(only one of them is illustrated in FIG.
1
). External air is absorbed into the mixing tube
17
through the openings
17
a
by virtue of negative pressure produced when the combustible gas passes through the mixing tube
17
. The combustible gas is mixed with air entering the mixing tube
17
through the openings
17
a
, into a gas mixture of the combustible gas and air.
After the gas mixture enters the burner head
16
, the gas is discharged through the openings
16
a
, and is ignited by the electric igniter
19
located in the vicinity of the burner head
16
.
The flame of the burning gas mixture heats an object to be heated such as a pan, kettle, food, etc., put on the kettle holders
18
.
In general, outdoor appliances, not limited only to portable gas cooking stoves, are required to be small. Regarding a portable gas cooking stove, the gas cartridge
11
cannot be fabricated smaller in size than a practical limit determined to ensure a volume of gas to maintain a gas-burning time required for practical use. Consequently, in a portable gas cooking stove, miniaturization has been focused mainly on the gas burner
12
, and more particularly, on the burner head
16
.
However, if the burner head
16
is simply reduced in size, a flow of the gas mixture may exceed the proper gas burning rate, because a volume of the burner head
16
becomes smaller relative to a gas flow from the gas cartridge
11
, resulting in a greater rate of the gas mixture discharged through the openings
16
a
of the burner head
16
.
If the gas mixture is discharged at a great rate, the gas mixture is rarely ignited by the spark generated by the igniter
19
, resulting in incomplete combustion of the gas mixture.
In addition, in the gas burner illustrated in
FIG. 1
, the igniter
19
is supported only by the support
19
a
, resulting in that the igniter
19
cannot be stably fixed relative to a gas flow of the gas mixture discharged through the openings
16
a
. This also causes incomplete combustion of the mixture gas.
SUMMARY OF THE INVENTION
In view of the above-mentioned problems in the conventional gas burners, it is an object of the present invention to provide a burner which is capable of stably igniting a gas mixture discharged from a burner head, and is capable also of stably supporting an igniter to thereby ensure ignition of the gas mixture.
There is provided a burner to be used for a portable gas cooking stove, including (a) a gas mixture pipe having an open end through which a mixture gas of combustible gas and air is exhausted, (b) a burner head connected to the mixture gas pipe in a hermetically sealed condition and having at least one opening at a surface thereof, the gas mixture blowing out through the opening, and (c) an igniter igniting the gas mixture blowing out through the opening of the burner head, the igniter generating a spark in a direction perpendicular to a flow of the gas mixture blowing out through the opening of the burner head.
As illustrated in
FIG. 1
, the igniter
19
is positioned facing the burner head
16
in the conventional burner. Accordingly, the igniter
19
generates spark in parallel with a flow of a gas mixture discharged through the openings
16
a
of the burner head
16
. Thus, a contact area between the spark and the gas mixture flow is relatively small. As a result, if the gas mixture had a great velocity, it was difficult to ignite the gas mixture by spark generated by the igniter
19
.
In contrast, the burner in accordance with the present invention includes an igniter which is positioned perpendicularly to a flow of gas mixture discharged through openings of a burner head. As a result, the spark is generated in a direction perpendicularly to a flow of gas mixture. Hence, a contact area between the spark and a flow of gas mixture in the burner in accordance with the present invention is greater than the same in the conventional burner illustrated in FIG.
1
.
Hence, the burner in accordance with the present invention makes it possible to stably ignite a gas mixture, even if the gas mixture has a great flow velocity.
It is preferable that the igniter is supported at lower and upper ends thereof by the mixture gas pipe.
It is preferable that the burner further includes an igniter cover in which the igniter is accommodated. The igniter cover is designed to have a projecting portion projecting in a direction, the projecting portion being formed with an opening having a diameter almost equal to a diameter of the mixture gas pipe. The igniter cover is fixed relative to the mixture gas pipe by engaging the projecting portion to the mixture gas pipe.
The igniter may be comprised of (a) a base block extending in a first direction, (b) a pillar extending in a second direction perpendicular to the first direction, (c) an igniter section extending from a summit of the pillar, and (d) a switch movable in the first direction, and the igniter cover may be comprised of (a) a first cover portion covering the base block therewith, and (b) a second cover portion covering the pillar therewith.
It is preferable that the first cover portion has a portion located above the switch and bent upwardly and obliquely.
It is preferable that the igniter is supported by the mixture gas pipe through an igniter support which is comprised of a ring engageable to the mixture gas pipe and a projection fittable into the second cover portion of the igniter cover, the projection being formed with an opening into which the pillar is to be fit.
There is further provided a burner to be used for a portable gas cooking stove, including (a) a gas mixture pipe having an open end through which a gas mixture of combustible gas and air is exhausted, (b) a burner head connected to the mixture gas pipe in a hermetically sealed condition and having at least one opening at a surface thereof, the gas mixture blowing out through the opening, (c) an igniter igniting the gas mixture blowing out through the opening of the burner head, the igniter generating a spark in a direction perpendicular to a flow of the gas mixture blowing out through the opening of the burner head, and (d) a generator comprised of a pipe through which the combustible gas flows, the generator being arranged outside and close to the burner head.
T
Clarke Sara
Lazarus Ira S.
Snow Peak, Inc.
Young & Thompson
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