JP2004309052A - Cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking stove improved in thermal efficiency with excellent maintainability. <P>SOLUTION: In this cooking stove, a secondary air flow straightening body 10 provided with a flow straightening part 14 inflected from a lower inclined part 11 to an upper inclined part 12 from the outer periphery toward the inner periphery is provided above an annular burner 6 with flame holes 8 lined up being opened toward the center, and a clearance between an opening end part 18 of a top plate 1 and the inside of an inner peripheral part 15 of the secondary air flow straightening body 10 is shielded with a frame body 5. Flames 25 are thereby centralized on the center of a heated body by secondary air flow 26 above to secure high thermal efficiency while preventing the fall of stock onto the flame holes 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stove using a burner that uses gas, oil, or the like as a fuel, as a heating source.
[0002]
[Prior art]
Conventionally, there is a stove of this type as shown in Patent Document 1. As shown in FIG. 5, this is an annular internal flame having a flame port 63 on the inner periphery below the opening 62 of the top plate 61 and located concentrically with the opening 62 of the top plate 61. When the flame 65 from the flame port 63 flows upward from below the top plate 61, the flame 65 is centered on the stove that includes the type burner 64 and guides the flame 65 from the flame port 63 through the opening 62 of the top plate 61. And a diffuser that inclines upward and outward to radially guide the flame 65 guided in the center direction by the aggregate 66 to the outside. A guide member 68 also serving as 67 and a cover member 70 for covering a gap 69 formed between the opening 62 of the top plate 61 and the guide member 68 from above are provided, and a gap is formed between the cover member 70 and the guide member 68. Contact without causing It is intended.
[0003]
In this configuration, the flame from the internal flame type burner 64 is concentrated and raised toward the center by the gathering portion 66 and the diffusion portion 67 of the cover member 70, then is raised and diffused outward, and at the same time, the cover is covered. The member 70 covers the gap 69 formed between the opening 62 of the top plate 61 and the guide member 68 to prevent infiltration of boiling water, and furthermore, by bringing the cover member 70 and the guide member 68 into contact without any gap, It is stated that the flame is prevented from going around between the cover member 70 and the guide member 68.
[0004]
[Patent Document 1]
JP-A-11-211089 <(0002) to (0010), FIG. 2>
[0005]
[Problems to be solved by the invention]
However, in the case of the above-mentioned conventional stove, the flame 65 from the internal flame type burner 64 is provided with the gathering portion 66 inclined upward toward the inside. Since the flame 65 is guided so as to diffuse obliquely upward and outward along the diffusion portion 67 inclined upward, the flame 65 is formed close to the guide member 68 and the cover member 70. Therefore, the degree of concentration of the flame 65 at the center is insufficient, and it has been difficult to increase the thermal efficiency beyond a certain level. Also, if there is a gap between the cover member 70 and the guide member 68 due to the proximity of the flame 65, a part of the flame 65 may enter between the cover member 70 and the guide member 68 through the gap, Therefore, it is essential that the cover member 70 and the guide member 68 be in close contact with each other.
[0006]
On the other hand, when the broth falls on the cover member 70 due to boiling over generated during cooking or the like, even if the inner diameter of the internal flame type burner 64 is set smaller than the inner diameter of the cover member 70, the cover member 70 and the guide member 68 The boiled liquid propagates from the portion where is closely adhered to the lower side of the guide member 68 as shown by the flow of the arrow, and falls from just above the flame port 63 of the internal flame type burner 64, and the broth is easily poured into the flame port 63. In some cases. If such a situation accumulates, clogging of the flame port 63 progresses, and the amount of combustion applied to the normally open flame port 63 which is not clogged increases, resulting in an increase in flame length or CO2. In such a case, it is necessary for the user to clean the clogged flame port 63 by some method to restore the open state of the flame port 63. If the depth of the flame port 63 is long as in the case of the flame burner 64, there is also a problem that it is difficult to clean the flame port 63.
[0007]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and promotes concentration of a flame in the center to enhance thermal efficiency, and at the same time, broth resulting from boiling over falls just above a burner and clogs a flame outlet. Stove that can maintain a normal combustion state by minimizing the need for cleaning the burner burner opening, and at the same time achieve energy saving and improvement in maintenance. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides an upper burner having a plurality of flame outlets arranged in a row at the center, in an opening of a top plate, in an inner circumferential direction from an outer periphery, and in an upward direction from a downward slope. A frame that separates an annular secondary air straightener provided with a straightening portion that bends incline, and covers a region extending from the top to the inside of the opening end of the top plate and the inner periphery of the secondary air straightener from above. Is provided.
[0009]
According to the above invention, the secondary air flowing above the burner is sucked by the flame from the burner heading toward the center, and flows in from the outer peripheral side to the inner peripheral side of the secondary air straightener. At this time, since the secondary air rectifier has constituted a rectifying portion that bends from an outer peripheral portion to an inner peripheral direction from a lower inclined portion to an upper inclined portion, the secondary air flow passing through the lower inclined portion flows in a downward direction. Therefore, the flame is concentrated at the center while suppressing the upward movement of the flame, and then the flame is upwardly directed toward the center by the upwardly inclined portion through the inflection portion. Furthermore, since the frame body covers the area extending from the top to the inside of the opening end of the top plate and the inner peripheral part of the secondary air straightening body, the flame rises and passes through the space formed inside the frame body. The flame spreads into the open air.
[0010]
Therefore, the flame tends to be concentrated at the center at a distance from the inner peripheral portion of the secondary air straightening body, and the heat receiving area of the pot in contact with the flame can be increased, and the thermal efficiency can be improved. Therefore, the flame flows out while securing a certain distance or more between the inner peripheral portion of the secondary air flow regulating body and the inner peripheral portion of the frame and the flame, so that the inner peripheral portion of the secondary air flow regulating member and the inner peripheral portion of the frame body. Even if a gap is provided in a portion where the inner peripheral portion of the frame body covers the inner peripheral portion of the secondary air rectifier, the flame does not flow into the gap. Therefore, when a gap is provided in a portion where the inner peripheral portion of the secondary air rectifier is covered by the inner peripheral portion of the frame, when boiling occurs, the broth flows from the inner peripheral portion of the frame to the secondary air rectifier. Propagation to the inner peripheral portion can be prevented, and the situation in which the broth enters the burner mouth of the burner can be reduced, and clogging of the burner mouth can be reduced. Therefore, a stove with high thermal efficiency and good maintenance can be realized.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In the embodiment of the present invention, in the opening of the top plate, above the annular burner in which a plurality of flame openings that open toward the center are arranged, from the outer periphery to the inner periphery, from the lower inclined portion to the upper inclined portion. An annular secondary air rectifier with an inflection rectifier is provided, and a frame is provided from above to cover the opening end of the top plate and the area inside the inner periphery of the secondary air rectifier. As a result, the secondary air flowing above the burner is sucked by the negative pressure generated when the flame from the burner goes to the center, and flows in from the outer peripheral side to the inner peripheral side of the secondary air straightener. At this time, since the secondary air rectifier has constituted a rectifying portion that bends from an outer peripheral portion to an inner peripheral direction from a lower inclined portion to an upper inclined portion, the secondary air flow passing through the lower inclined portion flows in a downward direction. Therefore, the flame is concentrated at the center while suppressing the upward movement of the flame, and then the flame is upwardly directed toward the center by the upwardly inclined portion through the inflection portion. Furthermore, since the frame body covers the area extending from the top to the inside of the opening end of the top plate and the inner peripheral part of the secondary air straightening body, the flame rises and passes through the space formed inside the frame body. The flame spreads into the open air. Therefore, the flame is more likely to concentrate on the center at a distance from the inner periphery of the secondary air straightening body and the inner periphery of the frame, and it is possible to increase the heat receiving area of the pot in contact with the flame and improve thermal efficiency can do. Therefore, the flame flows out while ensuring a certain distance or more between the flame and the inner peripheral portion of the secondary air rectifier and the inner peripheral portion of the frame. Overheating of the peripheral portion can be suppressed, and even if a gap is provided in a portion where the inner peripheral portion of the frame covers the inner peripheral portion of the secondary air rectifier, the flame does not flow into the gap. Further, by providing a gap in a portion where the inner peripheral portion of the secondary air rectifier is covered by the inner peripheral portion of the frame, when boiling occurs, the boiling juice flows from the inner peripheral portion of the frame to the secondary air rectifier. Can be prevented from propagating to the inner peripheral portion of the burner, the situation in which the broth enters the burner of the burner can be reduced, and clogging of the burner can be reduced. Therefore, a stove with high thermal efficiency and good maintenance can be realized.
[0012]
In addition, the inflection part of the secondary air rectification body is provided at a position inside from vertically above the flame opening of the burner. Even if the fluid propagates to the inner peripheral portion, it does not propagate to the outer peripheral side from the inflection portion, and can be dropped directly below the inflection portion. Therefore, the broth drops in the space inside the flame mouth, so that the broth does not enter into the flame mouth, and thus the clogging of the flame mouth can be prevented.
[0013]
In addition, the secondary air rectifier has a lower bent portion bent downward on the outer peripheral portion, so that a difference in height occurs between the lower bent portion and the inner peripheral portion of the outer peripheral portion of the secondary air rectifier. Therefore, a negative pressure is generated due to the rising airflow of the flame, which causes air to flow, and a sufficient secondary airflow is generated in the gap between the secondary air straightener and the burner. It is possible to concentrate the flame more centrally, and it is possible to prevent the flame from flowing back between the secondary air straightener and the burner at low thermal power.
[0014]
Further, by providing the inner peripheral portion of the frame body inside from the inner peripheral portion of the secondary air rectifier via a gap, and covering the inner peripheral portion of the secondary air rectifier in the vertical direction, The inner peripheral part and the inner peripheral part of the secondary air rectifier are in a non-contact state, and even if the broth flows over the frame, it can be dropped directly below the inner peripheral part of the frame, and the secondary air rectifier Can be reliably prevented from propagating to the inner peripheral portion, and clogging of the flame outlet can be prevented.
[0015]
In addition, since the inner peripheral portion of the frame is inclined downward toward the inside, even if the broth flows on the frame, the broth follows the downward inclination inward at the inner peripheral portion of the frame. Can flow obliquely inward, the propagation of the secondary air straightener to the inner peripheral portion can be reliably prevented, and the clogging of the flame outlet can be prevented.
[0016]
In addition, since the frame is provided with a single unit for placing the object to be heated, the user may forget to attach the frame after removing the frame once to clean and clean the frame. However, even if a pot or the like is placed in this state, stable placement becomes extremely difficult, and the user can easily be informed that he or she has forgotten to attach the frame. Therefore, compared to the case where the frame and the gorge are configured separately, the frame can be prevented from being unmounted, and the open end of the top plate and the secondary air generated by the frame not being mounted can be eliminated. It is possible to prevent a situation in which the broth enters a region reaching the inside of the inner periphery of the rectifier.
[0017]
Furthermore, the burner constitutes a combustion surface inclined obliquely upward, and a slit-like flame opening vertically opening vertically in the combustion surface is arranged in a row. The air, especially the secondary air in the lower part, tends to diffuse as an updraft, which promotes combustion and reduces the flame length. Further, since the flame is ejected obliquely upward and toward the center, unnecessary interference between the opposed flames can be suppressed, and the temperature rise of the combustion surface can be suppressed. Furthermore, since the flow direction of the broth caused by boiling over is parallel to the longitudinal opening direction of the slit-shaped flame mouth, even if the broth propagates on the inclined surface, the probability of entering the flame mouth is reduced, and the flame mouth is reduced. Clogging can be prevented.
[0018]
Furthermore, since the burner has its upper surface inclined obliquely downward toward the outside, even if the broth falls on the upper surface of the burner, the broth flows out along the downward inclination of the upper surface, and the flame burns out. The probability of intrusion into the mouth is reduced, and clogging of the flame outlet can be prevented.
[0019]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
(Example 1)
First Embodiment A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a partial vertical sectional view of a stove according to the present embodiment. In the figure, an annular frame 5 integrally formed with a plurality of virtues 4 composed of a plurality of virtues 3 is installed around an opening 2 of a top plate 1, and an annular burner 6 is provided below the opening 2. Has been installed. On the combustion surface 7 in which the upper part on the inner peripheral side of the burner 6 is inclined upward by about 75 °, a slit-shaped flame opening 8 which is vertically elongated and has a slit width of about 0.55 to 0.65 mm is provided. Above the burner 6, a secondary air flow regulating body 10 is separated via a gap 9. The secondary air rectification body 10 includes a rectification portion 14 that constitutes an inflection portion 13 extending from the lower inclined portion 11 to the upper inclined portion 12 from the outer peripheral side toward the inner peripheral side. The inner peripheral portion 15 of the secondary air rectifier 10 has an opening diameter larger than that of the inner peripheral portion 16 of the frame 5, and is covered by the inner peripheral portion 16 of the frame 5 in a non-contact state via the gap 17. ing. As described above, the frame 5 covers the region extending from the upper end to the opening end 18 of the top plate 1 and the inner peripheral portion 15 of the secondary air rectifier 10 from above. Is inclined downward toward the center inside. Further, below the burner 6, a burner stand 19 for mounting the burner 6 is provided via an air passage 20 communicating with the outside air.
[0021]
The slit-shaped flame port 8 of the burner 6 has a configuration in which short-slit flame ports 23 are alternately arranged between long-slit flame ports 22 composed of a plurality of long slits 21. The burner 6 is made of a sheet metal material having excellent heat and corrosion resistance, such as austenitic stainless steel such as SUS304, SUS316, and SUS321, or ferritic stainless steel such as SUS430 and SUS436.
[0022]
On the other hand, the center of the burner stand 19 has an opening shape, and the peripheral edge of the juice receiving tray 24 is placed on the peripheral end of the opening. The juice receiving tray 24 is configured to have an outer diameter smaller than the minimum dimension among the inner diameter of the burner 6, the diameter of the inner peripheral portion 15 of the secondary air rectifier 10, and the diameter of the inner peripheral portion 16 of the frame 5. It can be taken out of the top plate 1 by passing through the space inside the burner 6.
[0023]
Next, the operation and action will be described. When the fuel premixed gas is introduced into the burner 6, the slit-shaped flame port 8 is constituted by a narrow slit having a slit width of about 0.55 to 0.65 mm. Even if the primary air ratio is higher than 40 to 50% of the primary air ratio normally set for a burner (for example, 60 to 80%), it is difficult to make a flashback. Incidentally, the burner 6 is made of a stainless steel plate having excellent heat and corrosion resistance. By the configuration, the width of the slit-shaped flame port 8 can be normally pressed in a range of 0.8 to 1.2 times the plate thickness, and the degree of freedom in selecting the flame port shape depending on the plate thickness is increased. Can be enlarged. Therefore, it is easy to optimize the plate thickness of the burner 6 and the width of the slit-shaped flame opening 8 even in the case of a fuel having a high burning rate such as a mixture of hydrogen and air.
[0024]
In the case of the present invention, a stainless steel plate having a thickness of 0.5 to 0.6 mm is used, and the primary air ratio is set to 65 to 70%. In this manner, the fuel premixed gas having a high primary air ratio can be introduced, and the obliquely upward flame 25 formed toward the center at the slit-shaped flame opening 8 of the burner 6 is shortened and the flames 25 facing each other are shortened. And the heat radiation above the combustion surface 7 is improved, and the temperature rise of the combustion surface 7 can be suppressed. At this time, a negative pressure is generated in the gap 9 between the secondary air straightener 10 and the burner 6 due to the rising airflow of the flame 25, and an upper secondary airflow 26 toward the flame 25 is generated in the gap 9. However, since the secondary air rectifier 10 has the rectifying portion 14 that bends from the outer peripheral portion to the inner peripheral direction from the lower inclined portion 11 to the upper inclined portion 12, the secondary air flow 26 passing through the lower inclined portion 11 is directed downward. Therefore, the flame 25 is concentrated at the center while suppressing the upward movement of the flame 25, and then the flame 25 is upwardly directed toward the center by the upper inclined portion 12 via the inflection portion 13.
[0025]
On the other hand, below the burner 6, a lower secondary airflow 27 generated by the rising airflow of the flame 25 is generated through the air passage 20 of the burner stand 19. With this configuration, the lower secondary airflow 27 from the air passage 20 can be effectively caused to flow between the adjacent vertically elongated slits. Further, by the configuration in which the short slit flame port group 23 is arranged between the adjacent long slit flame port groups 16, in the case of a large thermal power, the flame 25 in which the short slit flame port group 23 is formed by the long slit flame port group 22. It is possible to reduce the interference between the flames 25 and to shorten the flame 25 by dividing the flame 25, and to improve the fire transfer between the long slit flame port groups 22.
[0026]
Further, in the case of small thermal power, the jetting speed from the slit-shaped flame opening 8 is reduced due to the decrease in the amount of the fuel premixed gas, so that the flame 25 is easily directed upward near the combustion surface 7, Due to the upper secondary airflow 26 flowing downward with the downward inclination 11 of the air straightening body 10, the flame 25 divides the inner peripheral portion 16 of the frame 5 and the inner peripheral portion 15 of the secondary air straightening body 10. To prevent intrusion into the gap 17 between the stove and the stove body. In this manner, the upper secondary air flow 26 and the lower secondary air flow 27 are effectively diffused into the flame 25 to promote combustion.
[0027]
As described above, in the case of the large thermal power, the flame 25 whose flame has been shortened can be concentrated at the center to maintain a high flame temperature, and in the case of the small thermal power, the flame 25 can be prevented from flowing back into the stove body. Therefore, even if the burner 6 has a wide variable combustion amount range and the distance between the burner 6 and the pan is reduced, the emission of CO can be reduced, and high thermal efficiency can be secured.
[0028]
On the other hand, the inner peripheral portion 16 of the frame body 5 is inclined downward toward the center inside, and covers the inner peripheral portion 15 of the secondary air flow regulating body 10 in a non-contact state through the gap 17, so that cooking is performed. When spilling occurs in the inside, boiled juice flows obliquely inward along a downward slope directed inward at the inner peripheral portion 16 of the frame 5, and from the lower end of the inner peripheral portion 16 of the frame 5 directly below it. The burner 6 can be prevented from entering the slit flame 8 of the burner 6 by reliably preventing the secondary air straightening body 10 from propagating to the inner peripheral portion 15 of the burner 6. Clogging can be reduced. Furthermore, since the flow direction of the broth generated by boiling over is parallel to the longitudinal opening direction of the slit-shaped flame port 8, even if the broth propagates on the inclined surface 7, the probability that the broth will enter the slit-shaped flame port 8. Is reduced, and clogging of the slit-shaped flame port 8 can be prevented. Even if the slit-shaped flame port is clogged, the combustion surface 7 of the burner 6 is made of a sheet metal material having a sheet thickness of less than 1 mm. Therefore, the slit-shaped flame opening 8 can be easily returned to the normal state.
[0029]
Furthermore, by providing the frame body 5 with the god 4 in one, even if a user once removes the frame body 5 and forgets to attach the frame body 5 for care and cleaning of the frame body 5, Even if a pot or the like is placed in this state, stable placement becomes extremely difficult, and the user can easily be notified of forgetting to attach the frame 5. Therefore, compared to the case where the frame 5 and the sword 4 are formed separately, the frame 5 can be prevented from being in the non-mounted state, and the opening end of the top plate 1 caused by the frame 5 not being mounted can be eliminated. It is possible to prevent a situation in which the broth enters the region extending between the portion 18 and the inner peripheral portion 15 of the secondary air rectifier 10. As described above, a stove with high thermal efficiency and good care can be realized.
[0030]
(Example 2)
Second Embodiment A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a partial vertical sectional view of the stove of this embodiment. In the figure, the point different from the first embodiment is that the secondary air rectifier 30 constitutes a rectifying section 34 provided with an inflection section 33 that bends from the lower inclined section 31 to the upper inclined section 32. The burner 6 is provided at a position inward from a position vertically above the slit-shaped flame opening 8, and the inner peripheral portion 35 of the secondary air rectifier 30 is covered by the inner peripheral portion 16 of the frame 5 via the gap 17. is there. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0031]
Next, an operation and an operation will be described. As in the first embodiment, the upper secondary air flow 34 flowing between the secondary air rectifier 30 and the burner 6 concentrates the flame 25 at the center to achieve high thermal efficiency. It has the effect of securing. Also, even if the broth caused by the spill propagates from the inner peripheral portion 16 of the frame 5 to the inner peripheral portion 35 of the secondary air rectifier 30, it does not propagate to the outer peripheral side from the inflection portion 33. , Can be dropped directly below the inflection portion 33. Therefore, the broth drops in the space inside the slit-shaped flame opening 8, so that the broth does not enter the slit-shaped flame opening 8, and the clogging of the slit-shaped flame opening 8 can be prevented. Therefore, a stove with high heat efficiency and good careability can be realized.
[0032]
(Example 3)
Third Embodiment A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a partial vertical sectional view of the stove of this embodiment. In the drawing, the difference from the first embodiment is that the secondary air flow regulating body 40 has a lower bent portion 41 bent downward on the outer peripheral portion. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0033]
Next, the operation and action will be described. Since a difference in height occurs between the lower bent portion 41 of the outer peripheral portion of the secondary air flow regulating member 40 and the inner peripheral portion 42, the upward flow of the flame 25 formed by the burner 6 causes The generation of negative pressure causes air to flow, and a sufficient upper secondary air flow 43 is generated in the gap 9 between the secondary air straightener 40 and the burner 6. 25 can be more concentrated in the center, so that the flame 25 can be prevented from flowing backward between the secondary air straightener 40 and the burner 6 with a low thermal power. Therefore, it is possible to provide a stove that realizes a wide combustion amount variable range in addition to heat efficiency and careability.
[0034]
(Example 4)
Embodiment 4 Embodiment 4 of the present invention will be described with reference to FIG. FIG. 4 is a partial vertical sectional view of the stove of this embodiment. In the figure, the difference from the first embodiment is that the upper surface 51 of the burner 50 is inclined obliquely downward toward the outside. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0035]
Next, the operation and action will be described. By tilting the upper surface portion 51 of the burner 50 obliquely downward toward the outside, even if the broth falls on the upper surface portion 51 of the burner 50, the broth is directed downward. The probability of inflow to the outside along the slope of the slit and intrusion into the slit-shaped flame opening 52 is reduced, and clogging of the slit-shaped flame opening 52 can be prevented. Therefore, a stove with high heat efficiency and good careability can be realized.
[0036]
【The invention's effect】
As described above, according to the present invention, in the opening of the top plate, above the annular burner in which a plurality of flame openings that open toward the center are arranged in a row, from the outer periphery to the inner periphery, By providing an annular secondary air rectifier that bends at the inclined part, and shielding the gap between the opening end of the top plate and the inner peripheral end of the secondary air rectifier by a frame, from above the burner The secondary airflow effectively concentrates the flame in the center, thereby increasing the heat receiving area of the pot.
[Brief description of the drawings]
FIG. 1 is a partial vertical cross-sectional view of a stove according to a first embodiment of the present invention. FIG. 2 is a partial vertical cross-sectional view of a stove according to a second embodiment of the present invention. FIG. FIG. 4 is a partial vertical sectional view of a stove according to a fourth embodiment of the present invention. FIG. 5 is a partial vertical sectional view of a conventional stove.
DESCRIPTION OF SYMBOLS 1 Top plate 2 Opening part 4 Gotoku 5 Frame body 6, 50 Burner 7 Combustion surface 8, 52 Slit-shaped flame opening 10, 30, 40 Secondary air straightener 11, 31, Lower inclined part 12, 32 Upper inclined part 13, 33 Inflection parts 14, 34 Rectifying parts 15, 35, 42 Inner peripheral part 16 of secondary air rectifier Inner peripheral part 17 of frame body Gap 18 Opening end 41 Lower bent part 51 Upper surface part

Claims (8)

In the opening of the top plate, an annular burner in which a plurality of flame openings that open toward the center is arranged is provided. A stove provided with an annular secondary air flow regulating body, wherein a gap between the opening end of the top plate and an inner peripheral end of the secondary air flow regulating body is shielded by an annular frame. The stove according to claim 1, wherein the inflection portion bent from the lower inclined portion to the upper inclined portion is provided inside a position vertically above the flame opening. The stove according to claim 1, wherein the secondary air straightening body has a downwardly bent portion bent downward at an outer peripheral portion thereof. The stove according to claim 1, wherein the inner peripheral portion of the frame is provided with a gap inside the inner peripheral portion of the secondary air flow regulating body. The stove according to any one of claims 1 to 4, wherein the frame body is inclined downward toward an inner inner peripheral portion. The stove according to any one of claims 1 to 5, wherein the frame body is provided integrally with a gode on which the object to be heated is placed. The stove according to claim 1, wherein the burner has a combustion surface inclined so that the flame is ejected obliquely upward, and a slit-shaped flame opening which opens vertically in the vertical direction is arranged in the combustion surface. The stove according to claim 7, wherein the burner has an upper surface formed in an annular shape, and the upper surface is inclined outward.

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