JP2004125285A - Burner and cooking stove using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking stove having a high heat efficiency and a wide variable range of combustion amount and capable of providing flat feeling in the cooking stove using gas as fuel. <P>SOLUTION: A secondary air straightening body 10 is installed above a burner 6 through a clearance 9, and an air blow means 12 supplying air into the clearance 9 is installed toward a center space. By this, the hot air of flame 17 is allowed to reach the center space irrespective of the jetting velocity of the flame 17. Thus, the cooking stove with flat feeling capable of providing uniform heating distribution and high efficiency and widely securing an intensity variable range by moving the burner 6 close to a pan under combustion with less emission of CO is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a burner using gas or the like as a fuel and a stove using the burner as a heating source.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, this type of stove has an opening 73 corresponding to the annular burner 72 above an annular burner 72 in which a number of inwardly directed flame ports 71 are arranged in a circumferential direction on the inner surface. In order to prevent the boil-over from reaching the annular burner 72, a top plate 74 provided with a hole is provided, and a top frame 74 having an opening diameter enough to cover the annular burner 72 is placed through the gap 76 to thereby reduce the number of holes. A secondary air passage 77 is provided, a secondary air introduction passage 78 is provided below the annular burner 72, and a juice tray is provided immediately below the annular burner 72. The pot was heated by the formed flame (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Published Japanese Utility Model Application No. 6-40705
[Problems to be solved by the invention]
However, in the case of the above-mentioned conventional stove, since the flame port 71 of the annular burner 72 is formed into a substantially cylindrical ejection port by press working, the size of one flame port 71 becomes relatively large, preventing flashback. For this purpose, the primary air ratio is set to about 40 to 50%. Therefore, the speed at which the flame is ejected from the flame outlet 71 becomes somewhat slow and the negative pressure generated by the flame output is low, so that the amount of secondary air flowing into the secondary air passage 77 is secured and CO is increased. In order to suppress this, it is necessary to secure a certain distance between the annular burner 72 and the pan to suppress the exhaust resistance, and as a result, there has been a problem that high thermal efficiency cannot be obtained. Further, in a state where the thermal power is reduced, the ejection speed from the flame outlet 71 is reduced, so that the negative pressure generated by the flame output is further reduced, and the amount of the secondary air flowing into the secondary air passage 77 is also reduced. . As a result, there is also a problem that the inner peripheral portion of the virtue frame 75 is heated because the flame is directed upward.
[0005]
The present invention solves the above-mentioned conventional problems, and secures good cooking performance while securing high thermal efficiency by shortening the distance to an object to be heated such as a pan. It is an object of the present invention to provide a stove that can ensure a proper combustion state.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a secondary air straightener through a gap above a burner in which a flame port opening toward the center is arranged, and faces a central space surrounded by the flame port. And a blower for supplying air into the gap, and a first air passage below the burner.
[0007]
According to the above invention, the burner is provided by forcibly supplying the secondary air into the gap between the burner and the secondary air straightener toward the center space surrounded by the flame outlet. Because the secondary air can be effectively introduced from above the space, the hot air of the flame reaches the central space regardless of the velocity of the flame, ensuring an effective heat transfer area between the flame and the pot. Can be. Further, by providing the first air passage below the burner, combustion is promoted by the secondary air forcibly supplied from above the burner and the secondary air naturally flowing in from the first air passage. Therefore, even if the distance between the burner and the pot is reduced to some extent, combustion with less CO emission can be realized. Furthermore, when the thermal power is reduced, the jetting speed of the flame decreases, but similarly, the secondary air forcedly supplied from above the burner allows the hot air of the flame to reach the central space, A uniform heating distribution of the pot can be secured without the flame being blown on the inside of the secondary air flow regulating body. In this way, the burner and the pot can be made closer to each other, so it is possible to lower the temperature and improve the thermal efficiency, and realize a high-efficiency stove with a flat feeling that secures a wide variable range of strength and weakness. Can be. Further, since the blowing means only needs to have a capability of forcibly supplying the secondary air only from the upper side of the burner, a large capacity fan is not required.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, a secondary air rectifier is provided via a gap above a burner in which a flame port opening toward the center is arranged, and a gap is formed toward a central space surrounded by the flame port. By providing a blowing means for supplying air into the inside, and by providing the first air passage below the burner, it is possible to effectively inflow secondary air from above the burner, so that the flame ejection speed Regardless, the hot air of the flame can reach the central space, and combustion is promoted by the secondary air forcibly supplied from above the burner and the secondary air naturally flowing in from the first air passage. Even if the distance between the burner and the pot is reduced to some extent, combustion with less CO emission can be realized. Therefore, by bringing the burner and the pan close to each other, it is possible to realize a stove with a flat feeling in which a uniform heating distribution, a high efficiency and a wide variable range of strength are secured.
[0009]
According to the second aspect of the present invention, a secondary air straightener is provided via a gap above a burner in which a flame port that opens toward the center is arranged, and a gap is formed toward a central space surrounded by the flame port. By providing a blowing means for supplying air into the inside, providing a first air passage below the burner and providing a second air passage above the secondary air straightener, the secondary air straightener has a Since the hot air flow of the flame, whose combustion is promoted by the secondary air forcibly supplied from above and the secondary air naturally flowing from the first air passage, blows out toward the central space, A negative pressure is generated above the secondary air straightener, and an airflow is formed from the second air passage toward the central space and flowing above the secondary air straightener. Therefore, this air flow flows out along the hot air flow while cooling the secondary air straightener and partially diffusing into the hot air flow of the flame, thereby promoting combustion and at the same time near the passage where the hot air flow flows out. Overheating can be suppressed.
[0010]
According to the third aspect of the present invention, the first air passage is opened upward from below the inside of the burner, so that the secondary air is effectively supplied from immediately below the flame formed inside the burner. be able to.
[0011]
According to a fourth aspect of the present invention, the secondary air straightener is inclined downward from the outside toward the inside, and an opening having a diameter equal to or smaller than the inner diameter of the burner is provided inside the secondary air straightener. When viewed from above, the burner will be shielded, so that even if boiling occurs, the broth is guided along the downward slope to the inside of the secondary air straightening body, preventing the broth from falling into the burner. be able to.
[0012]
According to the invention described in claim 5, the secondary air straightening body is inclined downward from the outside to the inside, and the end of the opening on the inside thereof is formed as a bent portion facing downward, so that boiling occurs. Also, the broth is guided to the inside of the secondary air rectifier along the downward slope, and furthermore, it is possible to prevent the simmer from flowing around the inner surface of the secondary air rectifier at the downward bent portion.
[0013]
According to a sixth aspect of the present invention, the burner is configured by an inclined surface having an upper portion inclined upwardly on the inner side, and a slit-shaped flame port is vertically arranged on the inclined surface so that the flame is directed obliquely upward. In addition, since the fuel is ejected toward the center, interference between the opposed flames can be suppressed, and a rise in the temperature of the inclined surface can also be suppressed.
[0014]
According to the invention described in claim 7, the burner has a vertical cross section on the inner side and the slit-shaped flame ports are arranged vertically in the vertical plane, so that the flame gushes substantially horizontally and toward the center. The flame can be brought to the center, and the heat transfer area of the pot can be expanded. Further, since the flame outlet is not opened upward, clogging of the flame outlet due to boiling can be prevented.
[0015]
The invention according to claim 8 provides a slope in which the lower part inside the burner is inclined downward, and the slit-shaped flame ports are arranged in the slope, so that the flame once blows obliquely downward and then flows to the center. Since the fuel is ejected so as to approach, a part of the combustion space can be formed below the burner, so that the flame can be brought to the center and the heat transfer area of the pot can be enlarged, and the distance from the burner to the pot can be shortened. Further, since the flame outlet is completely hidden from above, clogging due to boiling is extremely unlikely to occur.
[0016]
According to the ninth aspect of the present invention, the slit-shaped flame port of the burner is constituted by a long slit flame port group in which a plurality of long slit flame ports are arranged and a short slit flame port, and between adjacent long slit flame ports. By arranging the short slit flame port, the short slit flame port suppresses the interference between the flames formed by the long slit flame port group and splits the flame to realize short flame, and the long slit flame port group Good during the fire.
[0017]
The invention according to claim 10 is the burner, wherein the interval between adjacent short slit flame ports and long slit flame ports is larger than the interval between adjacent long slit flame ports. The effect of suppressing the interference between the flames formed by the group and shortening the flame is high, and the maximum combustion amount can be increased.
[0018]
According to the eleventh aspect of the present invention, the end of the slit-shaped flame port of the burner is formed in an R shape or a semicircular shape, so that when the fuel premixture passes through the slit-shaped flame port, the turbulence at both ends is obtained. Therefore, it is possible not only to suppress the lift of the flame, but also to prolong the service life of the mold when machining the flame port.
[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 sectional view of a stove according to the present embodiment.
[0021]
In the figure, an edging frame 4 in which a plurality of edging claws 3 are fitted is installed in an opening 2 of a top plate 1, and a mixing pipe 5 for introducing a fuel premixed gas is provided at one end below the opening 2. An annular burner 6 is installed. A slit-shaped flame opening 8 having a slit width of about 0.55 to 0.65 mm and opening in the vertical direction is provided on an inclined surface 7 in which the upper part inside the burner 6 is inclined upward by about 60 °. Is provided with a secondary air rectifier 10 that is gently inclined downward toward the center via a gap 9 and has a diameter of an inner opening slightly smaller than the inner diameter of the burner 6. Is formed by a downward bent portion 11. The secondary air rectifier 10 has a chamber shape as a whole, and a blowing unit 12 composed of a fan is connected to a part of the opening.
[0022]
On the other hand, a first air passage 13 opened upward is provided below the inside of the burner 6. The slit-shaped flame port 8 has a configuration in which short slit flame ports 16 are alternately arranged between a long slit flame port group 15 composed of a plurality of long slit flame ports 14. The burner 7 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.
[0023]
Next, the operation and the operation will be described. The fuel premixed gas is introduced into the burner 6 through the mixing pipe 5, and the slit-shaped flame opening 8 is constituted by a narrow slit having a slit width of about 0.55 to 0.65 mm. As a result, it is difficult for flashback to occur even at a high primary air ratio. Therefore, about 60 to 70% of the fuel premix gas having a relatively high primary air ratio is introduced, and a flame 17 is formed obliquely upward toward the center at the slit-shaped flame opening 8 of the inclined surface 7 of the burner 6. The flame 17 has little interference between the opposed flames 17, so that the heat radiation above the inclined surface 7 is also good, and the temperature rise of the inclined surface 17 can be suppressed. Simultaneously with the formation of the flame 17 in the burner 6, the forced secondary air flow 18 from the blowing means 12 flows into the gap 9 between the secondary air straightener 10 and the burner 6, and the secondary air straightener 10 Spills from the inside toward the central space. At this time, the hot air generated by the flame 17 reaches the vicinity of the central space by the forced secondary air flow 18 and then rises, and is discharged to the outside air while contacting the bottom of the pan, so that the effective heat transfer area between the flame 17 and the pan is reduced. Can be secured. On the other hand, since the first natural secondary air flow 19 which has become the upward airflow also occurs from the air passage 13 below the burner 6 and diffuses into the flame 17, the flame 17 is forced from above and below by the forced secondary air flow 18, The diffusion of the first natural secondary air stream 19 promotes combustion. It becomes a combustion state with little CO emission. In addition, since the flame port is constituted by the vertically elongated slit-shaped flame port 8, the first natural secondary airflow 19 from the air passage 13 can effectively flow between adjacent vertically elongated slits. In addition, due to the configuration in which the short slit flame port 16 is arranged between the adjacent long slit flame port groups 15, in the case of a large combustion amount, the short slit flame port 16 is formed by the flames formed by the long slit flame port group 15. The interference can be suppressed, the flame can be divided, and the flame can be shortened, and the fire transfer between the long slit flame port groups 15 can be improved. In this way, it is possible to secure a favorable combustion state in which CO emission is reduced and flame is shortened.
[0024]
On the other hand, when the combustion amount is low, the jet velocity decreases and the flame 17 moves upward. However, the forced secondary air flow 18 also causes the hot air to reach the vicinity of the central space. A uniform heating distribution can be ensured without the flame 17 blowing over the inside of the secondary air straightening body 10. Therefore, since the burner 6 and the pot can be brought close to each other, it is possible to improve the thermal efficiency by lowering the height of the goto claw 13 and to obtain a high-efficiency stove with a flat feeling that secures a wide variable range of intensity. Can be realized.
[0025]
Further, the burner 6 is made of a stainless steel plate or the like having excellent heat resistance and corrosion resistance, so that the width of the slit-shaped flame opening 8 can be pressed in a range of usually 0.8 to 1.2 times the plate thickness. Therefore, the degree of freedom in selecting the shape of the flame can be increased. 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.
[0026]
(Example 2)
Second Embodiment A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sectional view of the stove according to the present embodiment.
[0027]
In the figure, a point different from the first embodiment is that an air guide 20 having a shape corresponding to the inner peripheral portion of the virtue frame 4 is provided above the secondary air flow regulating body 10 to form a second air passage 21. .
[0028]
The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0029]
Next, an operation and an operation will be described. When the flame 17 is formed by the burner 6 in the same manner as in the first embodiment, the forced secondary air is supplied from the blowing means 12 to the gap 9 between the secondary air straightener 10 and the burner 6. 18 flows in and flows out from the inside of the secondary air flow regulating body 10 toward the central space. At this time, since a negative pressure is generated above the secondary air straightener 10, the second natural secondary airflow flowing from the second air passage 21 toward the central space and above the secondary air straightener 10. 22 are formed. Therefore, the second natural secondary air flow 22 cools the upper surface of the secondary air straightener 10 and partially diffuses into the hot air flow of the flame 17 and flows out along the hot air flow, thereby promoting combustion. At the same time, overheating of the vicinity of the passage from which the hot air flows out, such as the upper surface of the virtue frame 4, can be suppressed.
[0030]
(Example 3)
Third Embodiment A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a sectional view of the stove according to the present embodiment.
[0031]
In the drawing, the difference from the second embodiment is that the inner cross section of the burner 30 is a vertical plane 31 and slit-shaped flame ports 32 that open vertically are arranged in the vertical plane 31.
[0032]
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 the operation will be described. Since the flame 33 is ejected substantially horizontally and toward the center by setting the inner peripheral cross section of the burner 30 to the vertical plane 31, the flame 33 can be brought to the center. Thermal efficiency can be improved. Further, since the flame port 32 is not opened upward, a stove that can prevent clogging of the flame port due to boiling can be provided.
[0034]
(Example 4)
Embodiment 4 Embodiment 4 of the present invention will be described with reference to FIG. FIG. 4 is a sectional view of the capacitor of the present embodiment.
[0035]
In the figure, a point different from the second embodiment is that a sloped surface 41 in which a lower portion inside a burner 40 is inclined downward is provided, and a slit-shaped flame port 42 which is opened toward the center and opened vertically in the inclined surface 41. Have just been lined up.
[0036]
The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.
[0037]
Next, the operation and the operation will be described. Since the flame 43 is ejected obliquely downward and then toward the center by providing the inclined surface 41 in which the lower part inside the burner 40 is inclined downward, the burner 40 Since a part of the combustion space is formed below 40, the flame can be brought to the center most, and the distance from the burner 40 to the pot can be reduced. In addition, since the slit-shaped flame port 42 is completely hidden from above, it is possible to provide a stove in which clogging due to boiling is extremely unlikely to occur.
[0038]
(Example 5)
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged view of the slit-shaped flame port 51 of the burner 50 of the present embodiment.
[0039]
The difference from the first embodiment is that the arrangement interval W2 between the adjacent short slit flame 54 and the long slit flame 53 is larger than the arrangement interval W1 of the adjacent long slit flame 53 forming the long slit flame group 52. Has been enlarged.
[0040]
The components having the same reference numerals as those in the first embodiment have the same structure, and the description will be omitted.
[0041]
Next, the operation and action will be described. In the flame formed by the long slit flame port group 52, the arrangement interval W2 between the adjacent short slit flame port 54 and long slit flame port 53 is determined by the arrangement of the long slit flame port 53. By making the interval larger than the setting interval W1, the effect of suppressing interference between flames and shortening the flame is high, and it is possible to suppress an increase in the flame length even when a large amount of combustion is loaded, and as a result, the maximum combustion capacity of the burner Can be increased.
[0042]
(Example 6)
A sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged view of the slit-shaped flame opening 61 of the burner 60 of this embodiment as viewed from the front.
[0043]
The difference from the first embodiment is that the shape of the end portion 62 of the slit-shaped flame opening 61 is an R shape 63 or a semicircular shape 64.
[0044]
The components having the same reference numerals as in the first embodiment have the same structure, and the description will be omitted.
[0045]
Next, the operation and the operation will be described. When the shape of the end portion 62 of the slit-shaped flame port 61 is an R shape 63 or a semicircular shape 64, when the fuel premixture passes through the slit-shaped flame port 61, Since the turbulence at the end portion 62 can be prevented, not only the lift of the flame can be suppressed, but also the life of the mold can be extended when the slit-shaped flame port 61 is processed.
[0046]
【The invention's effect】
As described above, according to the present invention, the secondary air straightener is provided above the burner via a gap, and the air blowing means for supplying air into the gap toward the central space is provided. Regardless of the blowing speed, the hot air of the flame can reach the central space, and the combustion that emits less CO makes the burner and the pan close to each other, ensuring a uniform heating distribution and a wide range of high efficiency and strength variable Thus, a stove with a flat feeling can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a stove according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a stove according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view of a stove according to a third embodiment of the present invention. FIG. 5 is an enlarged view of a burner of a burner according to a fifth embodiment of the present invention. FIG. 6 is an enlarged view of a burner of a burner according to a sixth embodiment of the present invention. Cross section of conventional stove [Explanation of symbols]
6, 30, 40, 50, 60 Burner 7, 41 Inclined surface 8, 32, 42, 51, 61 Slit-shaped flame opening 9 Air gap 10 Secondary air straightener 11 Lower bent portion 12 Blower means 13 First air passage 14 , 54 Long slit flame port 15, 52 Long slit flame port group 16, 54 Short slit flame port 21 Second air passage 31 Vertical surface 52 End 63 R shape 64 Semicircular shape

Claims (11)

Above the burner in which the flame opening opening toward the center is arranged, a secondary air rectifier is provided through a gap, and a blowing means for supplying air into the gap toward a central space surrounded by the flame opening is provided. A stove provided with a first air passage below the burner. Above the burner in which the flame opening opening toward the center is arranged, a secondary air rectifier is provided through a gap, and a blowing means for supplying air into the gap toward a central space surrounded by the flame opening is provided. A stove provided with a first air passage below the burner and a second air passage above the secondary air straightener. The stove according to claim 1 or 2, wherein the first air passage is opened upward from below the inside of the burner. The stove according to any one of claims 1 to 3, wherein the secondary air straightener is inclined downward from the outside toward the inside, and has an opening inside the inside of which the diameter is equal to or smaller than the inside diameter of the burner. The stove according to any one of claims 1 to 4, wherein the secondary air straightening body is inclined downward from the outside toward the inside, and the end of the opening on the inside is a bent portion facing downward. The stove according to any one of claims 1 to 5, wherein the burner is configured by an inclined surface having an inner upper portion inclined upward, and a slit-shaped flame port is vertically arranged on the inclined surface. The stove according to any one of claims 1 to 5, wherein the burner has an inner cross-section that is a vertical plane, and slit-shaped flame ports are arranged vertically in the vertical plane. The stove according to any one of claims 1 to 5, wherein the burner is provided with an inclined surface having an inner lower part inclined downward, and slit-shaped flame ports are arranged vertically in the inclined surface. The burner has a slit-shaped flame port composed of a group of long slit flame ports and a plurality of short slit flame ports in which a plurality of long slit flame ports are arranged, and a short slit flame port is arranged between adjacent long slit flame ports. Item 9. The stove according to any one of Items 1 to 8. The stove according to claim 9, wherein the burner has a larger interval between adjacent short slit flames and longer slit flames than an interval between adjacent long slit flames. The stove according to any one of claims 1 to 10, wherein an end in a longitudinal direction of the slit-shaped flame port of the burner has an R shape or a semicircular shape.

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