JPH1047681A - Gas cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent scorching of the handle of a pan and the sleeve of a user by a method wherein an annular heat resisting burner port plate is provided to have a burner port part in which a plurality of burner ports are formed at intervals of a given distance, and an annular gas penetration member formed of a porous substance is arranged along an inner wall surface. SOLUTION: A burner port unit comprises an annular gas penetration member 37 formed of a metallic porous substance, and a heat resisting burner port plate 31. Premixed gas approximately similar to a theoretical air amount is generated in a burner and enters an opening part 41b of an inner ring plate 45, and penetrates through the gap of the gas penetration member 37 to the surface side and injected through a burner port 41a formed in an outer ring 46 to form a combustion flame. In a burner, even when combustion is effected by premixed gas having a high combustion speed, a back fire is prevented from occurring through action wherein the flame of the gas penetration member 37 is prevented from propagation to the internal part of a burner. Thus, even when a food is cooked in a pot by a high heating power, since an amount of flame flowing over from the side of a cooking pot is low, the handle of a pan and the sleeve of a user's sleeve is prevented from scorching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner burner.

[0002]

2. Description of the Related Art Conventionally, there has been provided an annular burner in which a large number of flame openings are arranged in the circumferential direction of an inner peripheral surface, and the flame is heated toward the center of the pot to improve the thermal efficiency, and the flame around the pot is heated. Gas stoves are known which reduce overflow and prevent the burner's flame from burning the handle of the cooking pot or the sleeve of the user.
For example, as shown in FIG. 6, a gas stove proposed in Japanese Utility Model Laid-Open No. 2-100102 is a soup tray 2 placed on a top plate 1.
And a gotoku 5 on which a cooking pot 8 is placed above an opening 6 formed in the soup tray 2, and a burner body 3 for burning fuel gas
And an annular burner head 4a which is mounted at the center position of the juice receiving tray 2 so as to be freely attached and detached coaxially to the head of the burner main body 3, and the burner head 4a is provided so that the annular burner burns well.
The secondary air is supplied to the central opening 7 of the hopper, and the secondary air is also effectively supplied between the juice receiving tray 2 and the burner head 4a.

[0003]

However, in such a conventional gas stove, since it is necessary to secure a combustion space in the center, the diameter of the entire burner becomes large, and the compactness of the burner is impaired. In some cases, broth spilled into the central opening forming the combustion space entered the utensil. Therefore, it was necessary to provide the saucer 9 for receiving the boiling juice falling in the vessel. Therefore, it is conceivable to use a compact annular burner in which the flame burns outward to make the combustion flame short flame and reduce the overflow of the flame around the pot 8. It is necessary to increase the area of each flame outlet and to set the primary air ratio at which the combustion speed of the fuel gas is maximized. However, in such a case, since the ejection speed is lower and the combustion speed is higher, there is a new problem that a backfire occurs in which the flame flows backward from the flame opening and ignites the air-fuel mixture in the burner.

[0004] A gas stove according to the present invention solves the above-mentioned problems, and provides a gas stove that reliably prevents the handle of a pot or the sleeve of a user from being scorched without impairing the compactness of the burner.

[0005]

According to a first aspect of the present invention, there is provided a gas stove having a burner in which a flame opening is formed on an outer periphery of an annular mixture chamber having an opening in the center. A gas stove that heats and cooks a cooking pot placed above the burner, wherein the flame port portion includes an annular heat-resistant flame port plate in which a plurality of flame ports are provided at predetermined intervals. The gist is that an annular gas permeable member made of a porous body is attached along the inner wall surface of the heat-resistant flame port plate.

A gas stove according to a second aspect of the present invention is characterized in that a primary air ratio (a ratio of a primary air amount to a theoretical air amount) of the burner is set to 0.9 to 1.0. I do.

A gas stove according to a third aspect of the present invention is characterized in that the width of the gas-permeable passage of the porous body constituting the gas-permeable member is formed to be 0.95 mm or less.

In the gas stove according to the first aspect of the present invention having the above-described structure, the gas stove is formed from a porous material along the inner wall surface of an annular heat-resistant spout plate having a spout with a predetermined interval. The gas mixture inside the burner penetrates from the back side to the front side over the entire surface of the gas permeation member and blows out from the flame port of the heat-resistant flame port plate to form a flame. I do. In this case, even if the surface of the flame outlet becomes high in flame temperature, the back surface of the infiltrating member is cooled by the mixed gas to a sufficiently low temperature. Therefore, the back surface of the infiltration member does not become hot due to heat conduction and ignites the mixed gas inside the burner. It is surely prevented. Therefore, a short flame can be obtained by adjusting the air ratio of the mixed gas and performing combustion with a fast combustion reaction. Further, since a large number of flame ports are formed at a predetermined distance, the flames are not formed in the circumferential direction but are formed for each flame port, so that the secondary air is sufficiently in contact between the flames. Therefore, since the incomplete combustion does not occur even if the primary air ratio is less than the theoretical air amount, the range of the primary air ratio in which good combustion is performed is widened.

In the gas stove according to the second aspect of the present invention having the above structure, the primary air ratio of the burner is set to 0.9 to 1.0, so that the combustion speed of the fuel gas becomes maximum and Since most of the air required for combustion is supplied as primary air, the burner flame becomes a short flame without forming an external flame. still,
In a general Bunsen burner, the primary air ratio is set at around 0.6, so that the combustion speed is relatively slow, and combustion takes in secondary air. Therefore, the flame is formed to extend upward without being backed.

In the gas stove according to the third aspect of the present invention, the gap between the passage walls of the porous body constituting the gas permeable member is set at the quenching distance of the fuel gas (the flow path where flame propagation is not performed). (Width) corresponding to 0.95 mm or less, so that it is possible to reliably prevent the flame from entering the burner through the gap between the gas permeable members.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of a gas stove burner of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a gas stove as one embodiment.
The gas stove according to the present embodiment is roughly divided into an ignition unit 10 for supplying and adjusting fuel gas and a combustion unit 2 for burning fuel gas.
0. The ignition unit 10 includes a front operation panel 17, a push-type operation button 11, a magnet safety valve 22 that opens and closes a fuel gas flow path, a main valve 23 that opens and closes a fuel gas flow path downstream thereof, A spindle 18 is inserted in the middle of the valve 23 to open the magnet safety valve 22 at the tip, a needle valve 24 for adjusting the fuel gas flow to the combustion section 20 further downstream thereof, and a burner flame by operating the needle valve 24. A heating power adjustment knob 15 for performing heating power adjustment is provided.

The combustion section 20 includes a burner 30 for burning fuel gas, and a nozzle 21 for injecting the fuel gas to the burner 30.
And an electrode 26 for igniting the mixed gas by applying a high voltage and discharging, and a thermocouple 28 for monitoring the flame of the burner 30. The burner 30 includes a burner main body 29 formed by pressing a thin stainless steel plate, a disc-shaped burner head 27 made of a hot forged product such as brass placed on the burner main body 29 from above, a burner main body 29 and a burner head 27.
And a ring-shaped flame port unit 40 sandwiched therebetween. The burner main body 29 is provided at a mixing pipe 32 for mixing the fuel gas and the primary air, an annular mixture chamber 36 downstream of the mixing pipe 32 for uniformly distributing the mixture, and a central portion of the mixture chamber 36. And a central opening 25. As shown in FIG. 2, a ring-shaped groove 4 is provided on the upper surface of the air-fuel mixture chamber 36 so that the flame port unit 40 is fitted and fixed slightly inside the peripheral edge.
2 are integrally formed. The burner head 27 includes a cylindrical fitting portion 39 extending downward at the center, and the fitting portion 39.
Umbrella 34 provided above opening 33 formed in the center of
And a ring-shaped boil-off spill-prevention piece 35 provided on the entire periphery. On the lower surface, a support portion 38 formed of a ring-shaped groove for fitting and fixing the flame port unit 40 is formed integrally on the inner side of the periphery slightly. The burner head 27 has its fitting portion 39 fitted and fixed to the central opening 25 of the burner main body.

As shown in FIGS. 2, 3, and 4, the flame port unit 40 includes an annular gas permeable member 37 formed of a porous metal material, an outer ring plate 46 and an inner ring plate 45 made of a stainless steel plate. Are connected to each other at the bottom in a U-shaped cross-section to form an annular heat-resistant flame opening plate 31. In addition, heat-resistant mouth plate 3
The outer ring plate 46 is provided with rectangular flame openings 41a at equal intervals, and the inner ring plate 45 is provided with an air-fuel mixture opening 41b.
Are provided at equal intervals. Also, as shown in FIG.
The flame opening 41a of the outer ring plate 46 is provided so as to face a non-opening portion of the inner ring plate 45, that is, a gap formed between adjacent opening portions 41b. And U of the heat-resistant flame mouth plate 31
The gas permeable member 37 is inserted into the space of the character portion to form the flame port unit 40, and the lower end side thereof is formed in the groove 42 of the annular air-fuel mixture chamber 36.
And the upper end thereof is supported by the support portion 38 of the burner head 27.
, And is attached so as to close the peripheral space area between the burner main body 29 and the burner head 27.

The gas permeable member 37 is formed by pressing a porous material having a myriad of continuous small holes from the surface to the inside, such as a fibrous heat-resistant metal wire, by pressing. The object formed by sintering after processing is integrally formed in a plate shape (mat shape) such that a gap between passage walls of the object is 0.95 mm or less. Further, the length of the heat-resistant material fiber wire is not particularly limited, and may be a long fiber or a short fiber of, for example, about several mm. As the refractory metal material, for example, a fibrous wire such as iron-chromium (fe-cr) is used.

Next, the operation of the gas stove of this embodiment will be described. When the operation button 11 is pressed, the button shaft 13 is pressed via the ignition lever 12 behind the operation button 11. Then, the spindle 18 slides to open the main valve 23 and the magnet safety valve 22 in the fuel gas passage, and the igniter (not shown) linked with the movement of the button shaft 13 is turned on. Then, electricity is supplied from a dry battery (not shown), and discharge is performed at the electrode 26 by the function of the igniter.
The mixed gas of the fuel gas and the primary air is released from the flame port 41a and is ignited by this discharge. And operation button 1
Even if 1 is released, the button shaft 13 is locked during the retreat, and the main valve 23 is kept open. At the same time, since the magnet safety valve 22 is opened and held by the electromotive force of the thermocouple 28 due to the combustion heat, the fuel gas is continuously supplied and the combustion continues. At this time, the heating power control lever 15 is operated as required for cooking, and the fuel gas flow rate is adjusted by the needle valve 24.
Adjust the burner flame power. When the operation button 11 is pressed again, the button shaft 13 is unlocked, and the spindle 18 is released.
Retreats, the main valve 23 closes and the fire extinguishes. At the same time, the generation of the electromotive force of the thermocouple 28 disappears and the magnet safety valve 22 is closed.

Next, the relationship between the flame shape and the primary air ratio will be described with reference to FIG. As the primary air ratio to fuel gas approaches the stoichiometric air ratio of 1.0, the combustion reaction becomes faster and the flame becomes shorter. Then, when the ratio becomes larger than the theoretical air ratio, the ratio becomes larger again. This is because the size of the flame is based on the balance between the jet velocity and the combustion velocity of the air-fuel mixture. In general, the combustion speed of a mixed gas of heavy hydrocarbons serving as gas fuel becomes the fastest when the primary air ratio is close to the theoretical air ratio. Further, the amount of heat generated when the same amount of fuel gas is burned is substantially the same regardless of the size of the flame.

According to the gas stove of this embodiment, when fuel gas is ejected from the gas nozzle 21 to the gas inlet of the burner 30, a large amount of air corresponding to the theoretical air amount is sucked by the ejector action. As a result, a premixed gas near the theoretical air volume is created inside the burner 30,
This premixed gas enters through the opening 41b of the inner ring plate 45 and penetrates through the gap of the gas permeable member 37 to the surface side,
A combustion flame is formed by squirting from a flame port 41a provided in the outer ring plate 46. Also, the opening 41 provided in the inner ring plate
b faces the non-flame port of the outer ring plate 46 and obliquely faces the flame port 41a.
Since the distance passing through the gas permeable member 37 becomes longer,
The material can be saved without forming the gas permeable member 37 unnecessarily thick. Also, a flame port 41a for forming a flame
Since the spaces are arranged in a row with a predetermined gap therebetween, secondary air is supplied to the gap and is taken in on both sides of the flame. The secondary air supplied from the opening 33 at the center of the burner head 27 is taken in on the back of the flame. Therefore, when the gas amount is adjusted by lowering the gas pressure of the nozzle, even if a situation occurs in which the amount of primary air sucked by the ejector action is insufficient and the theoretical air amount is reduced, incomplete combustion is caused by ingestion of the secondary air. Does not occur, so that the thermal power adjustment range is widened and the range of the air ratio for good combustion is widened.

Further, the burner 30 of the present embodiment does not cause the flame of the gas permeable member 37 to propagate inside the burner, so that backfire does not occur even if the burner 30 is burned with a premixed gas having a high burning speed. That is, it is possible to burn with a premixed gas near the theoretical air amount where the combustion speed is high and the back is likely to occur. In addition, the premixed gas near the theoretical air amount is almost one.
Combustion occurs only with the secondary air, and a short high-temperature flame that is indistinguishable, such as an internal flame and an external flame, is formed. Therefore, even when the pot is cooked with high heat, the amount of flame overflowing from the side of the cooking pot is small, so that the handle of the pot or the sleeve of the user is prevented from being abraded.

The embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments. For example, the porous body is a vent having a myriad of continuous small holes from the surface to the inside. The porous body used for the gas permeable member of the embodiment is made of metal, but may be made of a heat-resistant inorganic substance. Further, as shown in FIG. 7, the shape of the flame port and the opening of the heat-resistant flame port plate may be round holes 43a and 43b, and may be carried out in various modes without departing from the spirit of the present invention. It is.

[0020]

As described in detail above, claim 1 of the present invention
The gas stove described was formed by mounting a ring-shaped gas permeable member made of a porous body along the inner wall surface of a ring-shaped heat-resistant flame plate having a large number of flame holes formed at a predetermined distance. There is no backfire in which a flame enters. Therefore, it is possible to perform combustion with a premixed gas of a theoretical air amount having a high combustion speed, and a short flame without overflowing the flame from the side of the pot is obtained. Burning can be prevented. Also, since the flame port of the heat-resistant flame port plate is drilled at a predetermined interval, the contact of the secondary air of the flame is good, and even if the primary air volume becomes less than the theoretical air volume due to the adjustment of the thermal power, good combustion is achieved. Sex is maintained. In addition, since the burning of the sleeve can be prevented by a simple method such as making the flame short, it can be made more compact than a burner which needs to secure a combustion space in the center.

According to a second aspect of the present invention, the gas stove is one of the burners.
Since the next air ratio was set to 0.9 to 1.0 and the combustion flame was made the shortest length without changing the heating power, the amount of flame overflowing around the cooking pot was reduced, and the handle and sleeve of the user were reduced. It is safe without burning.

In the gas stove according to the third aspect, the gap between the gas permeable members is formed to be 0.95 mm or less corresponding to the quenching distance of fuel gas (the width of the flow path where flame propagation is not performed), and is formed inside the burner. It is safe because it reliably prevents backfire from entering the flame.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas stove as one embodiment.

FIG. 2 is an explanatory sectional view showing one configuration example of a flame port unit.

FIG. 3 is an explanatory diagram showing a configuration example of a flame port unit.

FIG. 4 is an explanatory view showing an embodiment of a flame port unit.

FIG. 5 is an explanatory diagram showing a primary air ratio and a flame length.

FIG. 6 is a schematic configuration diagram of a gas stove as a conventional example.

FIG. 7 is an explanatory view showing another embodiment of the flame port unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Ignition part 15 ... Thermal power control lever 20 ... Combustion part 21 ... Nozzle 23 ... Main valve 24 ... Needle valve 25 ... Central opening 26 ... Electrode 27 ... Burner head 28 ... Thermocouple 29 ... Burner main body 30 ... Burner 31 ... Heat resistance Flame port plate 33 ... Opening hole 35 ... Juice cutting part 36 ... Annular mixture chamber 37 ... Gas permeable member 38 ... Supporting part 39 ... Fitting part 40 ... Flame port unit 41a ... Flame port 42 ... Groove 43a, 43b ... Round hole 45 ... Inner ring plate 46 ... Outer ring plate

Claims (3)

[Claims] 1. A gas stove comprising a burner having a flame opening formed on an outer periphery of an annular mixture chamber having an opening in the center and heating a cooking pot placed above the burner to cook. The flame port portion includes an annular heat-resistant flame port plate in which a plurality of flame ports are formed at predetermined intervals, and an annular gas-permeable member made of a porous body is attached along the inner wall surface of the heat-resistant flame port plate. Gas stove characterized by doing. 2. The gas stove according to claim 1, wherein a primary air ratio (a ratio of a primary air amount to a theoretical air amount) of the burner is set to 0.9 to 1.0. 3. The gas stove according to claim 1, wherein a passage width of a gas permeating the porous body constituting the gas permeable member is formed to be 0.95 mm or less.