JP4431803B2 - Gas stove - Google Patents

Description

  The present invention relates to a cooking gas stove such as a table stove and a built-in stove.

Conventionally, in the field of a gas stove, as shown in Patent Document 1, in order to improve the heating efficiency of a cooking vessel, a gas stove with a narrow burner combustion space has been put into practical use.
Specifically, using the five virtues that consist of the five virtue rings that expose the central burner and the five virtue claws that stand on the five virtue rings and support the cooking vessel, first lower the height of the five virtue claws. The secondary air is supplied from the base of the flame to the tip by the configuration in which the buttocks of the five virtue are extended to the vicinity of the main flame opening of the burner head.
And it is set as the structure which discharge | releases the combustion gas of a burner outside from the clearance gap (ring-shaped combustion gas channel | path) between a cooking vessel and a Gotoku ring.
With this structure, the cooking container is brought close to the burner head, and the diffusion of the combustion gas in the burner is prevented by the Gotoku ring, so that the high-temperature combustion gas and the cooking container are brought into contact with each other, thereby improving the thermal efficiency of the cooking container. ing.

JP 2003-161449 A

In the gas stove with a narrow combustion space as in Patent Document 1, the passage of the combustion gas generated from the burner is likely to be clogged with the broth, and in that case, there is a problem that the combustion cannot be performed satisfactorily.
In addition, since such a gas stove has not yet improved the thermal efficiency, the inventors divided the combustion gas passage into a plurality of passages so that the combustion gas generated in the burner does not escape in the radial direction. Then, a gas stove with a longer contact distance between the combustion gas and the bottom surface of the cooking vessel was considered, but in such a case, the divided combustion gas passages were particularly narrow and the tendency to clog was strong, which was a big problem.

  Therefore, an object of the present invention is to provide a safe gas stove that detects blockage of a combustion gas passage.

In order to achieve the above object, the invention described in claim 1
A burner for heating the cooking vessel;
In the gas stove provided with a mounting portion for mounting the cooking container,
Blockage detection means for detecting blockage of the flow path through which the combustion gas of the burner flows,
Blockage processing means for controlling fuel gas supply to the burner based on the blockage detection by the blockage detection means ,
A fan for supplying combustion air to the burner;
An air flow sensor provided in the fan air passage;
With
The gist of the blockage detection means is to detect the blockage based on the relationship between the rotation speed of the fan and the detected value of the air flow sensor .

According to the first aspect of the present invention, when the blockage detection unit detects blockage of the flow path through which the combustion gas of the burner flows, the blockage processing unit controls the fuel gas supply to the burner based on the blockage detection unit. In this case, the supply of fuel gas may be stopped, or the supply amount may be reduced. Further, the gas supply amount may be controlled according to the degree of blockage.
As a result, poor combustion is prevented and safety is improved.
In addition, this is particularly suitable for a stove having a configuration in which a narrow combustion gas passage is formed to easily boil the juice.

In addition, the fan speed and the detected value of the air flow sensor are correlated in the normal state, but when the burner combustion gas flow path is blocked, the fan speed relative to the detected value of the air volume sensor is normal. Rise out of range. As a result, the blockage can be easily detected. In this case, since the blockage of the air supply path can also be detected, this is particularly effective in a stove equipped with a forced combustion burner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a table stove 1 that is an example of a gas stove. A juice pan 4 is placed on the outer periphery of an opening 3 formed in the top plate 2, and a stove burner 20 is placed at the center of the opening 3. Is arranged. 5 is a virtue placed on the periphery of the opening 3, and the cooking container P is placed on the 5 virtue 5.
The stove burner 20 is an all-primary air type burner that sucks most of the air necessary for combustion as primary air, and has a cylindrical burner body 21 having a flange 22 around its upper end, and a number of flame outlets 24 on the outer periphery. .. And a cylindrical burner head 23 having a cylindrical shape. An air supply fan 6 for supplying combustion air is connected to the burner body 21 upstream, and a gas nozzle 8 for ejecting fuel gas is provided in the middle of the air supply path 7. The gas pipe connected to the gas nozzle 8 includes, from the upstream side, a magnet solenoid valve 9 serving as a safety valve, a main valve 10, and a needle valve 11 that adjusts the gas flow path by a heating power adjustment lever 12 provided in front of the table stove 1. Each is provided.
Further, a pressure sensor 40 for detecting the pressure in the air supply path 7 is connected in the middle of the air supply path 7.

Reference numeral 13 denotes a controller that controls the operation of an igniter (not shown) upon receiving an ignition operation, and also monitors a temperature sensor (thermocouple or the like) (not shown) provided in the vicinity of the burner during combustion of the burner 20 to detect the magnet solenoid valve 9. The energization control is performed, and the blockage detection control process described later is performed based on the detected pressure of the pressure sensor 40.
Further, the outer periphery of the burner body 21 below the flange 22 of the stove burner 20 and the lower surface of the juice receiving tray 4 and the lower surface of the five virtue ring 15 of the five virtue 5 described later are covered with a heat insulating material, for example, ceramic wool 14, 14,. Yes.

As shown in FIG. 2, the burner head 23 has a cylindrical inner ring 25 in which a lower end around which the flange portion 26 is provided is placed in a recess 27 that is recessed in the upper surface of the burner body 21, and the upper end is closed. (Right end in FIG. 2) and a cylindrical body that is slightly larger than the inner ring 25, and has a double cylinder structure with an outer ring 28 (center in FIG. 2) that is coaxially mounted on the inner ring 25. In this overlapped state, both rings 25 and 28 are substantially in close contact.
First, the inner ring 25 is made of brass, and circumferential slit grooves 29, 29,... Having a V-shaped cross section are formed on the outer peripheral surface at equal intervals in the vertical direction, and at the bottom of each slit groove 29, Square small holes 30 are formed at equal intervals. The small holes 30 are aligned in the vertical direction between the slit grooves 29. Specifically, a ring body in which vertical grooves 25a, 25a,... In the vertical direction are formed at equal intervals on the inner peripheral surface is formed by forging, and a slit groove 29 is turned on the outer peripheral surface of the ring body in the circumferential direction. It is produced by forming. That is, the portion where the vertical groove 25 a and the slit groove 29 overlap is the small hole 30.

Next, the outer ring 28 is made of heat-resistant stainless steel, and the vertical slit openings 31, 31... Are formed at equal intervals in the circumferential direction.
In a state where the outer ring 28 is externally mounted on the inner ring 25, as shown at the left end of FIG. 2, the small holes 30, 30,... Of the inner ring 25 and the slit openings 31, 31,. Both rings are positioned so that the small holes 30 of the inner ring 25 cannot be seen from the outside. With this arrangement, the burner head 23 reaches the slit opening 31 of the outer ring 28 from the small hole 30 of the inner ring 25 through the slit groove 29 of the inner ring 25 as shown in the enlarged view in the circle of FIG. A mixed gas passage 32 is formed, and a portion overlapping with the mixed gas passage 32 in the slit opening 31 is a flame opening 24.

  On the other hand, the five virtues 5 are bent in a ring shape with the inner peripheral edge and the outer peripheral edge facing downward, and the upper virtue ring 15 has a gently inclined surface that becomes higher as it goes to the outer periphery, and on the five virtue rings 15 in the vertical direction It consists of eight partition walls 16, 16,. Reference numeral 17 denotes a fixed leg that is provided downward from the bottom surface of the virtually ring 15 and is inserted and fixed to the top plate 2 outside the opening 3. As shown in FIGS. 3 and 4, the partition wall 16 is erected in an arc shape on the upper surface of the virtually ring 15 from the inner tip to the outer rim tip and is integrated with the virtually ring 15. Moreover, each partition wall 16 is arrange | positioned according to each direction so that it may become the spiral shape centering on the stove burner 20, and an upper end is formed in the same height so that the cooking container P can be mounted, cooking It comes into contact with the bottom surface of the container P in a spiral line shape and also serves as a virgin claw that supports the cooking container P.

Therefore, in the five virtues 5, spiral combustion gas passages 34, 34... Surrounded by the upper surface of the five virtue ring 15, the partition wall 16 and the bottom surface of the cooking container P are formed. By setting the curved shape of the wall 16, the distance W between the adjacent partition walls 16, 16 (the distance between the horizontal partition walls orthogonal to the flow direction of the combustion gas) is changed from the center of the stove burner 20 to the outside. The combustion gas passages 34 are gradually narrowed from the inner periphery to the outer periphery so that the combustion gas passages 34 become narrower as they leave.
In addition, helping that the upper surface of the Gotoku ring is inclined upward as it goes outward, the cross-sectional area of each combustion gas passage (the cross-sectional area perpendicular to the flow of the combustion gas) becomes farther away from the center of the conoburner. It is narrower. The cross-sectional areas of the passages may be substantially the same even if the distance from the center of the stove burner is increased. In other words, the cross-sectional area of the passage does not have to become wider as it becomes farther from the center of the conoburner.

  On the other hand, a swirl vane ring 35 made of heat-resistant stainless steel is placed on the flange 22 of the stove burner 20. The swirl vane ring 35 includes a small ring plate 36 that expands in a trumpet shape from the inner periphery to the outer periphery, and a plurality of swirl blades 37 as lift prevention plates that are erected vertically on the small ring plate 36. , 37..., And is set so that the highest outer peripheral edge of the small ring plate 36 is continuously connected to the lowest inner peripheral edge of the inclined surface of the Gotoku ring 15 in the state of being mounted on the flange 22. .

As shown in FIGS. 5 and 6, the swirl blades 37 are formed in an arc shape when viewed from above, like the partition wall 16 of the virtually ring 15, and each has a spiral shape with the conoburner 20 as the center. The swirl vanes 37 are connected to the combustion gas passage 34 of the virtually ring 15. Further, the inner end of the swirl vane 37 is formed so as to be located within 5 mm and within 15 mm (10 mm in this embodiment) from the flame formation surface (outer peripheral surface of the outer ring 28) of the burner head 23. This is because if it is less than 5 mm, it is too close to the flame opening 24 to deteriorate the combustion performance, and if it exceeds 15 mm, the lift preventing effect cannot be sufficiently obtained.
Thus, the combustion flame ejected from the flame opening 24 of the burner head 23 is turned diagonally upward between the swirling blades 37 and 37 of the swirling blade ring 35 and swung in the tangential direction of the cylindrical outer peripheral surface of the burner head 23. Thus, the combustion gas passage 34 of the five virtue ring 15 and a series of combustion guide passages 38, 38,... Are formed.
In addition, the top view of a stove part is shown in FIG.

In the table stove 1 having the stove burner 20 configured as described above, when the cooking container P is placed on the five virtues 5, the upper is the bottom of the cooking container P, and the lower is the five virtue rings 15 and swirl blades of the five virtues 5. Combustion spaces closed by the small ring plates 36 of the ring 35 are formed, and the combustor 20 and the outer peripheral side of the Gotoku 5 are combusted between the combustion guide passage 38 between the swirl vanes 37 and 37 and the partition walls 16 and 16. The gas passage 34 communicates.
When an ignition button (not shown) provided in front of the table stove 1 is pressed here, the main valve 10 and the magnet electromagnetic valve 9 are forcibly opened, and fuel gas is supplied to the stove burner 20. At the same time, the controller 13 rotates the air supply fan 6 to supply combustion air to the burner 20, and also operates the igniter to perform ignition control.

  The fuel gas mixed with the combustion air in the middle of the air supply path 7 becomes a mixed gas, moves up in the burner body 21, and is sent to the burner head 23. In the mixed gas passage 32 of the burner head 23, as shown in the enlarged view in a circle of FIG. 2, first, after being jetted into the slit groove 29 through the small hole 30 of the inner ring 25, the mixed gas is here sent to the slit groove 29. It is divided into right and left inside, is ejected to the outside through the slit opening 31, and the combustion flame F is formed at each flame opening 24 in the slit opening 31. At this time, even if the outermost portion is the slit opening 31 having a large opening area, in each mixed gas passage 32, the mixed gas collides with each other in the slit groove 29 and becomes a turbulent flow. It is possible to prevent the combustion flame F from backing into the burner head 23 or lifting from the flame opening 24 and maintain a good combustion state. Furthermore, since the mixed gas passage 32 is narrowly formed using the slit groove 29, the flame holding property can be further improved. In addition, by using the slit groove 29, it is possible to easily form a narrow gas passage without using precise processing, so that the manufacturing cost can be suppressed.

And here, by forcibly supplying the combustion air by the air supply fan 6, even in the case of the same combustion amount, the combustion space can be narrowed and the thermal efficiency can be improved.
In other words, when combustion air is supplied to natural draft force, if the combustion space is narrowed, draft force is not formed, and combustion air is not supplied or exhausted smoothly. In this case, since the combustion air is forcibly supplied by the air supply fan 6, a good combustion state can be obtained even if the combustion space is narrowed.

  If combustion air is increased and combustion is improved in this way, the ejection speed of the mixed gas increases and the combustion flame is easily lifted. Here, however, the combustion flame F ejecting and burning from each flame port 24 is immediately outside. The combustion flame F does not lift from the burner head 23 because it abuts against the swirl blades 37, 37,... Of the swirl blade ring 35, and the swirl blades 37, 37,. It is formed. Therefore, the combustion gas is also led directly to the outer periphery of the swirl vane ring 35 through the combustion guide passage 38 between the swirl vanes 37.

  Subsequently, the combustion gas flows into the plurality of combustion gas passages 34, 34... Divided in a spiral shape on the virtues 5 and moves to the outer periphery in a spiral shape while colliding with the partition wall 16. During the collision with the partition wall 16, the combustion gas changes its flow from the horizontal direction to the upper direction and collides with the bottom surface of the cooking container P. For this reason, the contact between the bottom surface of the cooking container P and the combustion gas becomes good, and the contact distance becomes long, so that the heat transfer efficiency can be improved. In particular, since the passage cross-sectional area of the combustion gas passage 34 divided into a spiral shape is formed so as to become narrower as it is farther from the burner 20, the temperature of the combustion gas decreases due to heat exchange with the bottom surface of the cooking vessel P. Even if this is the case, the flow rate does not decrease, diffusion of the combustion gas is prevented, and heat exchange is promoted to the end of the combustion gas passage 34.

That is, by passing a heat flow of combustion gas through a narrow space formed from the inside to the outside of Gotoku 5, the bottom surface of the cooking container can be effectively heated without diffusion of heat. Further, when the diameter of the cooking container P is smaller than the diameter of the Gotoku ring 15, the combustion gas that has escaped from the bottom of the cooking container is directed upward by the partition wall 16 and flows along the side surface of the cooking container. Can be effectively used as cooking and heating.
Further, since the flame is surrounded by the spiral partition wall 16, the flame does not flow out from the side of the lower surface of the cooking container, and it is safe without igniting the user's clothes.
In addition, since the heat | fever of the combustion gas transmitted to the Gotoku ring 15 is thermally insulated by the ceramic wool 14, discharge | release of combustion gas heat to the exterior can be suppressed.

As described above, in the gas stove as in the present embodiment in which the combustion space is narrowed to improve the thermal efficiency, the combustion gas passage 34 between the Gotoku ring 15 and the cooking vessel P is easily clogged with boiled juice or the like. There is a problem.
In order to detect the blockage of the combustion gas passage 34, a pressure sensor 40 is connected in the middle of the air supply path 7, and an exhaust blockage is detected based on the detected pressure to control the supply amount of the fuel gas. Perform control processing. As the combustion gas passage 34 is blocked and narrowed with broth or the like, the pressure in the air supply passage 7 increases, so that the detection value of the pressure sensor 40 also increases. Therefore, when the detected value exceeds a predetermined blockage reference value set in advance, the magnet electromagnetic valve 9 is closed to cut off the supply of fuel gas to prevent poor combustion.
Alternatively, a gas proportional valve may be provided in a gas pipe serving as a fuel gas passage, and the gas amount may be reduced as the detection pressure of the pressure sensor 40 increases. That is, if the combustion gas passage 34 is blocked, the exhaust resistance increases according to the degree of blockage and the air volume decreases. Therefore, the gas volume is controlled so that good combustion performance can be maintained even with the decreased air volume. When the detected pressure exceeds a predetermined blockage reference value (a value at which good combustion performance cannot be maintained even if the gas amount is reduced), the magnet solenoid valve 9 is closed to shut off the supply of fuel gas.
In this embodiment, the pressure sensor 40 is connected to the air supply path 7 before the fuel gas is introduced. However, the pressure sensor 40 is connected to the air-fuel mixture flow path downstream of the connection portion of the gas nozzle 8 to detect the pressure. However, gas amount control may be performed.
Further, as shown in FIG. 8, an opening may be provided in the flange 22 of the burner main body 21, and a pressure sensor 40 ′ may be connected thereto to detect the exhaust gas blockage by detecting the pressure of the combustion gas. .
Further, as shown in FIG. 9, a differential pressure sensor 42 that detects a differential pressure between the suction port 41 of the air supply fan 6 and the air supply path 7 (or the mixed gas supply path) is provided, and according to the detected pressure. Then, the exhaust blockage may be detected. In this case, since not only the blockage of the combustion gas passage 34 but also the blockage of the suction port 41 of the air supply fan 6 can be detected simultaneously, it is particularly effective in a stove equipped with a forced combustion burner as in this embodiment. It will be something.
Thus, according to the table stove 1 of the said form, if the blockage | combustion of the combustion gas channel | path 34 is detected based on the detection pressure of the pressure sensor 40 provided in the air supply path 7, the fuel to the stove burner 20 will be based on it Control gas supply. In this case, the supply of fuel gas may be stopped, or the supply amount may be reduced. Further, the gas supply amount may be controlled according to the degree of blockage.
As a result, combustion failure is prevented and safety is improved.
In particular, the table stove 1 as in the present embodiment, which has a configuration in which boiling juice is easily formed because the narrow combustion gas passage 34 is formed in order to achieve high thermal efficiency, is suitable. Moreover, since the blockage is detected based on the pressure in the air supply path 7 to the burner 20 or the flow path through which the combustion gas flows, the blockage can be reliably detected.
Further, in the case of detecting the differential pressure between the suction port 41 of the air supply fan 6 and the air supply path 7, not only the blockage of the combustion gas passage 34 but also the blockage of the suction port 41 of the supply air fan 6 can be detected simultaneously. In the gas stove as in this embodiment provided with the forced combustion type burner, it is particularly effective.

Next, a table stove 201 of another embodiment (embodiment 2) as an exhaust blockage countermeasure will be described with reference to FIG.
In this embodiment, an air volume sensor 43 for detecting the air volume is provided in the middle of the air supply path 7 (or the mixed gas supply path), and the rotation speed of the air volume sensor 43 (the air volume of the air supply fan 6) depends on the fuel gas supply volume. The number of rotations of the air supply fan 6 is controlled so as to be a value (feedback control). Then, when the correlation between the appropriate air flow with respect to the gas supply amount and the fan rotation speed is deviated and the rotation speed of the air supply fan 6 exceeds a predetermined normal rotation speed range, a blockage occurs. And the magnet solenoid valve 9 is closed to stop the supply of fuel gas. In addition, a gas proportional valve is provided in a gas pipe serving as a fuel gas passage, and the fuel gas supply amount is reduced according to the degree of blockage determined from the rotational speed of the air supply fan 6, thereby preventing combustion failure. It doesn't matter.
Further, in checking the correlation between the rotational speed of the air volume sensor 43 and the fan rotational speed, not only the blockage of the combustion gas passage 34 but also the blockage of the suction port 41 of the supply fan 6 can be detected simultaneously. In a stove equipped with a forced combustion type burner as in the embodiment, this is particularly effective.

  As described above, the table stove 201 of the second embodiment detects the exhaust blockage based on the rotational speed of the air supply fan 6 and the rotational speed of the air volume sensor 43. That is, the rotation speed of the air supply fan 6 and the detection value of the air volume sensor 43 have a correlation in the normal state, but when the combustion gas passage 34 of the stove burner 20 is closed, the rotation speed of the air supply fan 6 is. On the other hand, the blockage can be easily detected by utilizing the fact that the detection value of the air volume sensor 43 falls below a predetermined range. In this case, since the blockage of the air supply path 7 can also be detected, this is particularly effective in a gas stove equipped with a forced combustion burner as in this embodiment.

The table stove according to the present embodiment described above has the following effects.
According to the burner 20 of the said form, even if a jet speed becomes fast, it becomes possible to prevent the lift of the combustion flame F effectively by the turning blade ring 35. FIG. Therefore, it can be suitably used for a table stove that narrows the combustion space and improves the thermal efficiency.
Further, as the lift prevention plate, the swirl vane 37 that turns the combustion flame F obliquely upward and in the tangential direction of the cylindrical outer peripheral surface of the burner body 21 is provided, so that a suitable lift prevention effect can be obtained. Yes. In particular, since a plurality of swirl vane rings 35 erected on the upper surface of a small ring plate 36 provided on the outer periphery of the burner body 21 are used, a plurality of swirl vanes 37, 37. A lift prevention effect can be obtained. Furthermore, the flame is swirled by the swirl vane 37, so that the contact between the bottom surface of the cooking container and the flame is improved, so that the thermal efficiency is also improved in this respect.

On the other hand, the inner end of the swirl vane 37 is installed at a position within the range of 5 mm to 15 mm from the flame formation surface, so that the optimum position where a sufficient lift prevention effect can be obtained without deteriorating the combustion performance can be selected. It has become.
Further, around the swirl vane ring 35, the five virtue ring 15 having the partition wall 16 for swirling the combustion gas in the same direction as the swirl vane ring 35 is arranged, so that the swirl vane ring 35 is guided to the outer periphery while swirling. The combustion gas can be smoothly swung in a series of flows even in the Gotoku ring 15, and heat exchange with the cooking vessel P by the combustion gas can be suitably performed.
The stove burner 20 is formed as an all-primary air combustion burner in which primary air for combustion is forcibly supplied by the air supply fan 6 so that almost no outside air flows into the combustion space below the cooking vessel P. By applying to the table stove 1, the lift of the combustion flame by the increase of primary air can be prevented, and it can contribute to the improvement of thermal efficiency.
In addition, since the Gotoku ring 15 and the swirl vane 37 are provided separately, the trouble that the heat of the swirl vane 37 is transmitted to the Gotoku ring 15 to dissipate heat can be prevented, which also helps to improve the thermal efficiency. ing.

Moreover, according to the table stove 1 of the said form, the several partition wall 16 which partitions off the combustion gas channel | path 34 on the virtuosity ring 15 is stood up in the direction different from the radial direction of the virtuosity ring 15, The distance between the adjacent partition walls 16 is set so as to become smaller from the center of the stove burner 20 to the outside, so that the diffusion of the combustion gas even outside the combustion space where the temperature decreases due to heat exchange with the cooking vessel P Can be prevented, heat exchange with the cooking container P can be promoted, and improvement in thermal efficiency can be effectively realized.
Moreover, since the partition wall 16 is formed in a spiral shape when viewed from above, the contact distance with the bottom surface of the cooking container P can be kept long, and the thermal efficiency can be further improved. Further, since the distance between the adjacent partition walls 16 can be easily adjusted, the passage cross-sectional area of each combustion gas passage 34 can be easily adjusted so that the heat flow does not diffuse.

The partition wall 16 is erected on the virtually ring 15 from the inner tip to the outer tip, and when the cooking container P is placed, the upper end of the partition wall 16 is burned as a virgin claw that comes into contact with the bottom surface of the cooking container P in a spiral line shape. The gas passage 34 is formed in a spiral shape surrounded by the top surface of the virtuosity ring 15, the partition wall 16 and the bottom surface of the cooking container P. It can be used for other sections. Moreover, when the combustion gas flows outward along the spirally divided combustion gas passage 34, it strikes the partition wall 16 and is guided upward to collide well with the bottom surface of the cooking container P. Heats well. Moreover, the combustion gas that has escaped from the bottom of the bottom of the cooking container P on the virtuosity ring 15 is directed upward by the partition wall 16 and flows along the side surface of the cooking container P, so that the cooking container P side surface is also heated well.
Therefore, thermal efficiency is dramatically improved by preventing diffusion of heat and controlling the flow of combustion gas.

  Furthermore, according to the above-described conoburner 20, the inner ring 25 having a plurality of small holes 30 formed on the outer peripheral surface of the cylinder and the outer ring 28 having the slit openings 31 are substantially in close contact with each other. As described above, the communication space between the small holes 30 and the slit openings 31 of the rings 25 and 28 is used as the mixed gas passage 32 so that the small holes 30 and the slit openings 31 of both the rings 25 and 28 A small flame opening 24 can be formed by superposition. Therefore, it is possible to effectively prevent the flame lift and back. Moreover, since it is not necessary to make the small hole 30 and the slit opening 31 small forcibly, it is excellent in workability. Furthermore, clogging is less likely to occur in the small holes 30 and the slit openings 31, and cleaning can be easily performed by separating the rings 25 and 28.

In particular, here, a circumferential slit groove 29 is formed on the outer peripheral surface of the inner ring 25 and a plurality of small holes 30 are formed in the slit groove 29, while a vertical slit opening is formed in the outer ring 28. 31, the overlapping portion of the slit groove 29 and the slit opening 31 is a flame opening 24, and the mixed gas is guided from the small hole 30 of the inner ring 25 to the slit opening 31 of the outer ring 28 through the slit groove 29, Since the flame is formed by the slit opening 31, the mixed gas collides in the slit groove 29 and becomes a turbulent flow, so that the flame holding property is improved. Therefore, it is possible to more effectively prevent flame lift and back.
In addition, since the outer ring 28 that is heated directly by the flame and becomes high temperature is formed of a metal having higher heat resistance than the inner ring 25, the burner 20 having excellent durability can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.
For example, the outer virtually ring is not limited to a spiral partition wall having a narrow outer passage width as in the above embodiment, but a spiral partition wall having a wider outer peripheral passage width. It may be provided or a conventional radial virtuosity nail instead of a spiral shape.
Further, in this embodiment, the forced combustion method is used to supply the primary air for combustion by the fan, but a natural combustion type burner may be used, and an exhaust fan is provided to suck the exhaust gas, and accordingly Combustion air may be supplied to the burner. Further, an air supply fan for combustion air and an exhaust fan for discharging combustion exhaust gas may be provided.

  Of course, the gas stove is not limited to the table stove, but can be applied to a built-in stove or the like.

It is explanatory drawing of a table stove. It is explanatory drawing of a burner head. It is explanatory drawing (a top is a plane and the bottom is a side) of a gorgeous ring. It is a perspective view of a five virtue ring. It is explanatory drawing (a top is a plane and the bottom is an AA line cross section) of a turning blade ring. It is a perspective view of a turning blade ring. It is a top view of a stove part. It is explanatory drawing of the table stove of another Example. It is explanatory drawing of the table stove of another Example. It is explanatory drawing of the table stove of Example 2. FIG.

Explanation of symbols

1, 201 Table cooker 5 Gotoku 6 Air supply fan 7 Air supply path 9 Magnet solenoid valve 13 Controller 20 Combustor 34 Combustion gas path 40, 40 'Pressure sensor 41 Suction port 42 Differential pressure sensor 43 Air volume sensor P Cooking container

Claims (1)

A burner for heating the cooking vessel;
In the gas stove provided with a mounting portion for mounting the cooking container,
Blockage detection means for detecting blockage of the flow path through which the combustion gas of the burner flows,
Blockage processing means for controlling fuel gas supply to the burner based on the blockage detection by the blockage detection means ,
A fan for supplying combustion air to the burner;
An air flow sensor provided in the fan air passage;
With
The gas hob characterized in that the blockage detection means detects the blockage based on the relationship between the rotational speed of the fan and the detected value of the air flow sensor .

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