JP6069084B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker that can change the intensity of heating between a central portion and an outer peripheral portion of a heating object. In particular, in a heating cooker configured so that different cooking is possible at the center and the outer periphery of the object to be heated, the present invention relates to a heating cooker capable of changing the intensity of heating between the center and the outer periphery of the object to be heated. .

  Conventionally, for example, there is a cooking device disclosed in Patent Document 1 as a cooking device capable of simultaneously cooking two or more types in one unit. Patent Document 1 discloses a baking plate with a pan, which includes a baking plate and a pan, and a fitting hole is provided in a part of the baking plate, and the pan is detachably fitted into the fitting hole. ing. It is said that it is now possible to cook yakiniku and shabu-shabu at the same time.

  Moreover, as a heat source generally used for a roaster, for example, there is a Bunsen burner of Patent Document 2. The Bunsen burner of Patent Document 2 includes a plurality of flame holes formed in a connection portion between the top wall of the annular portion, the outer peripheral wall, and the inner peripheral wall, and a gas introduction portion that introduces gas together with the primary air into the annular portion. Yes. A gas nozzle connected to a gas source is connected to one end of the gas introduction part, and a primary air suction port is provided so as to surround the gas nozzle (paragraph [0002] in Patent Document 2). And FIG. 3).

Japanese Utility Model Publication No. 2-119130 JP-A-10-227415

  When cooking with a heating cooker like patent document 1, generally first, it heats with a strong fire in order to boil the liquid in a pan. And after the liquid in a pot boils, in order to prevent the liquid in a pot from evaporating at an early stage or the bottom of a pot being burnt down, the heating power is lowered to medium heat.

  In the burner described in Patent Document 2, when the heating power is lowered from a strong fire to a medium fire, the flame that is ejected from the inner wall flame hole of the burner is not so small, whereas it is ejected from the outer wall flame hole of the burner. The flame tended to be smaller. For this reason, the temperature does not decrease so much at the center of the heating object placed on the upper part of the burner, while the temperature tends to decrease at the outer periphery of the heating object.

  Therefore, when the burner of Patent Document 2 is used as a heating source of the heating cooker of Patent Document 1, even if the heating power is lowered from a strong fire to a medium heat, the temperature of the pan constituting the central part of the heating object is Since it does not drop so much, the liquid in the pan continues to boil, and the liquid in the pan may evaporate early or the bottom of the pan may become stiff. On the other hand, since the temperature of the baking board which comprises the outer peripheral part of a heating target object falls, there exists a possibility that the grilled meat on a baking board may become difficult to burn.

  As described above, in the conventional heating source, for example, the central part and the outer peripheral part of the heating object are weakened in the central part of the heating object, while the heating state is maintained in the outer peripheral part of the heating object. It was not supposed to change the intensity of heating.

  This invention is made | formed in view of the said novel subject, and it aims at providing the heating cooker which can change the strength of the heating of the center part and outer peripheral part of a heating target object. In particular, an object of the present invention is to provide a cooking device capable of weakening the heating of the pan at the center while maintaining the heating of the mesh body at the outer periphery when the heating power is lowered.

  A first feature of the present invention is an upper opening box, a cooking unit that is placed on the box, the center is a pan placement unit, and the periphery of the pan placement unit is a net, and the cooking unit Between the cylindrical portion and the outer cylindrical portion, and a hot plate having a central opening, a double cylindrical portion that is arranged below the hot plate and includes an inner cylindrical portion and an outer cylindrical portion. A burner including a supply pipe that communicates with the formed space and has an inlet for primary air, and a blower; a fuel gas supplied to the supply pipe in the inner and outer cylinders A plurality of inner and outer peripheral flame holes, from which a mixed gas of primary and primary air is ejected, are provided obliquely upward, and a secondary air flow path is formed inside the inner cylinder portion. The primary air and the secondary air are supplied by the blowing means.

  By forcibly supplying the primary air from the blowing means together with the fuel gas to the supply pipe, the combustion speed becomes higher than the jet speed of the mixed gas. The phenomenon that returns. As a result, the fire foot of the flame ejected from the inner flame hole becomes smaller. And since the fire foot of the flame ejected from the inner peripheral flame hole becomes smaller, the collision with the flame ejected from the other inner flame hole is reduced and the flame foot of the flame does not become larger. No longer hits the pot rest. Furthermore, due to the rise of the secondary air supplied to the inside of the cylindrical portion, the hot air current is diverted from the inside of the hot plate and the central opening of the hot plate to the upper pan mounting portion, so that heat is dispersed. Become. As a result, the temperature of the pan mounting part can be lowered by weakening the heating of the pan mounting part. Thereby, the overheating of the pan placed on the pan placing portion can be suppressed, and the excessive boiling of the liquid in the pan can be suppressed.

  In addition, by forcibly supplying secondary air from the blower means to the inside of the cylindrical part of the burner, the flame that comes out of the inner peripheral flame hole is diverted by the hot plate and travels along the lower surface of the hot plate to the outer periphery of the hot plate. It will flow. Then, the hot air flow heated by the flame ejected from the inner peripheral flame hole is jetted upward from the outer peripheral edge portion of the hot plate along the lower surface of the hot plate to heat the net. As a result, the heating of the pan mounting portion provided in the central portion is weakened and the temperature is lowered, while the heating of the net provided around the pan mounting portion is maintained.

  The second feature of the present invention is that a wall portion surrounding at least the outer cylinder portion is further provided, and a gap between the outer cylinder portion and the wall portion forms a flow path of secondary air.

  The secondary air is forcibly supplied to the gap between the outer cylinder part and the wall part of the burner, so that the hot air current in the surrounding hot plate is guided by the suction of the rising secondary air and the outer peripheral edge of the hot plate. In addition, the flame ejected from the peripheral flame hole also flows to the outer periphery of the hot plate. And the hot airflow heated by the flame which ejects from an outer periphery flame hole ejects upwards from the outer periphery part of a hot platen, and heats a net body. Further, since the combustion state is made good mainly by the supply of primary air, the hot air flow in a state where the calorific value is increased is guided to the outer peripheral edge portion of the hot plate in a state of being divided into the hot plate. As a result, the heating of the mesh body is maintained, and the temperature decrease of the mesh body can be prevented.

  The third feature of the present invention is that an annular guide wall having a larger diameter than the hot plate and surrounding the outer peripheral flame hole is provided in the box.

  An annular guide wall having a larger diameter than the hot plate and surrounding the outer flame hole serves to guide the hot air stream heated by the flame ejected from the outer flame hole upward. That is, the hot airflow that has flowed to the outer periphery of the hot plate is turned upward by the guide wall, and the net is heated by being ejected from between the outer peripheral edge of the hot plate and the guide wall. . As a result, the heating of the mesh body is maintained, and the temperature decrease of the mesh body can be prevented. Furthermore, since the guide wall is provided, the broth dripped from the net to the wall of the box body by suppressing the flame that blows out from the peripheral flame hole directly hits the box body and overheating the box body. It is possible to prevent the sticking of dirt due to the like.

  The fourth feature of the present invention is that it further includes air volume adjusting means for adjusting the air volume of the air blowing means.

  By providing the air volume adjusting means for adjusting the air volume from the air blowing means, it is possible to adjust the size of the fire foot ejected from the inner flame hole and the outer flame hole and the speed of the hot air flow. As a result, it is possible to adjust the heating of the pan placing portion and the net.

  The fifth feature of the present invention further comprises a table and a second box that houses the box, wherein the first box and the second box are disposed below the table, A suction space is formed between the one box and the second box, an exhaust gas suction port is provided in the suction space, and an exhaust port communicating with the exhaust passage is formed in the second box. It is.

  By setting it as the said structure, the smokeless cooking device which can attract | suck the vapor | steam which generate | occur | produces from a pan at the time of cooking, and the smoke which generate | occur | produces when baking food on a net body can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the heating cooker which can change the strength of heating with the center part and outer peripheral part of a heating target object can be provided. In particular, by preventing overheating of the liquid in the pan by suppressing the overheating of the central pan mounting part, while maintaining the heating of the net around the pan mounting part, heating that can prevent the temperature drop of the net A cooker can be provided.

It is sectional drawing of the whole heating cooker of this invention. It is a top view of a cooking part. It is a top view of a hot platen. (A) is a top view of a hot plate receiver, (b) is AA arrow sectional drawing of a hot plate receiver. It is a perspective view of a burner body and a burner head. (A) is a top view of a burner body, (b) is BB arrow sectional drawing of a burner body, (c) is a bottom view of a burner body. (A) is a front view of a burner head, (b) is CC arrow sectional drawing of a burner head. (A) is a top view of an adjustment damper, (b) is DD arrow sectional drawing of an adjustment damper. (A) is a top view of a housing | casing, (b) is a left view of a housing | casing. It is a top view of a saucer. It is a schematic diagram showing the flow of primary air, fuel gas, mixed gas, secondary air, flame, and hot airflow. It is a graph showing the temperature change of the pan mounting part in Example 2, and a net body.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of the entire heating cooker 1 of the present invention.

  The heating cooker 1 of the present invention includes a table 2, an outer box 3 (second box) arranged below the table 2, and an upper box-like inner box 4 (box) arranged in the outer box 3. Body and first box).

  The inner box 4 includes a side wall 4a, a step 4b provided above the side wall 4a, a bottom wall 4c continuous with the side wall 4a, a bottom opening 4d provided in the center of the bottom wall 4c, and a bottom opening 4d. A peripheral wall 4e (wall portion) that is continuous with the bottom wall 4c and extends upward. A cooking unit 5 is placed on the step 4 b of the inner box 4.

  The space surrounded by the side wall 4a, the bottom wall 4c, and the peripheral wall 4e of the inner box 4 forms a drain space 6. Water or water is poured into the drain space 6 and oil or gravy falling from ingredients on the net 5b to be described later Configured to accept. In this way, oil or gravy falling from the food on the mesh body 5b is prevented from adhering to the bottom wall 4c and sticking, and periodic cleaning is facilitated.

  A step 3a is provided above the outer box 3, and a top ring 7 is placed on the step 3a.

  The top ring 7 includes an inner annular member 7a having an opening smaller than the upper opening diameter of the inner box 4, an outer annular member 7b attached integrally to the outer periphery of the inner annular member 7a, and an upper surface of the outer annular member 7b. And a plurality of outside air suction ports 7 c formed along the circumferential direction, and a partition wall 7 d that partitions the suction space 8 formed between the outer box 3 and the inner box 4. In the present embodiment, the partition wall 7d is formed by bending the inner annular member 7a side of the outer annular member 7b downward. However, the partition wall 7d can be configured by a member different from the outer annular member 7b. It is.

  When the top ring 7 is placed on the step 3a of the outer box 3, a gap is formed between the upper end of the inner box 4 and the lower surface of the inner annular member 7a. This gap sucks steam generated from the pan P placed on the pan placing portion 5a and smoke generated when baking food on the net 5b (hereinafter collectively referred to as “exhaust gas”). An exhaust gas suction port 9 for this purpose is formed. Further, as described above, the suction space 8 is divided into two spaces by the partition wall 7d, and the space between the partition wall 7d and the outer box 3 forms the outside air suction flow path 10, and the partition wall 7d The space between the inner box 4 forms an exhaust gas suction passage 11.

  A space between the outer box 3 and the inner box 4 located below the suction space 8 constitutes an exhaust passage 12. A cylindrical filter 13 is provided in the exhaust flow path 12, and this filter 13 is attached to an exhaust port 14 formed at the bottom of the outer box 3. The exhaust port 14 is connected to exhaust means (not shown) such as a blower.

  The outside air sucked from the outside air suction port 7c and the waste gas sucked from the exhaust gas suction port 9 were formed between the outer box 3 and the inner box 4 through the outside air suction channel 10 and the exhaust gas suction channel 11, respectively. The exhaust channel 12 is reached. Then, it passes through the filter 13 and is discharged from the exhaust port 14.

  FIG. 2 shows a plan view of the entire cooking unit 5. The cooking unit 5 includes a pan placing unit 5a at the center and a net 5b around the pan placing unit 5a. The cooking unit 5 is capable of cooking pots at the center and pottery dishes such as yakiniku at the outer periphery. The pan mounting part 5a is composed of a ring part 5d having a central opening part 5c, and a support wall 5e attached to the ring part 5d and made of an annular member having a larger diameter than the central opening part 5c. On the ring portion 5d, a support wall 5e made of an annular member having a diameter larger than that of the central opening 5c of the ring portion 5d is attached, so that a step 5f is formed in the pan mounting portion 5a. The pan P will be placed. And the pan P is heated because a hot air current strikes from the center opening part 5c to the bottom face of a pan.

  In addition, as the pot P, in addition to a general pot, for example, a cooking utensil that has a depth such as a frying pan and can be used for cooking pots can be used.

  FIG. 3 shows a plan view of the hot plate 15. A dome-shaped hot plate 15 is disposed below the cooking unit 5, and the hot plate 15 is placed on a step 16 e of a hot plate receiver 16 described later. The heating plate 15 is heated by a flame ejected from a burner 17 described later, thereby heating the cooking unit 5 by radiant heat. The hot plate 15 is provided with a circular central opening 15a at the center, and a plurality of slope openings 15b are provided on the dome slope. The shape of the slope opening portion 15b is configured by a circular or slit-shaped long hole.

  4A shows a plan view of the hot plate receiver 16, and FIG. 4B shows a cross-sectional view of the hot plate receiver 16 taken along the line AA in FIG. 4A. The hot plate receiver 16 has a central opening 16a having a smaller diameter than the peripheral wall 4e, a conical mounting table 16b, a guide wall 16c made of an annular member having a larger diameter than the mounting table 16b, and a guide wall 16c. A plurality of support plates 16d that are provided at equal intervals in the circumferential direction and connect the upper surface of the mounting table 16b and the inner peripheral surface of the guide wall 16c are provided. A step 16e is provided at the upper end of the support plate 16d, and the heat plate 15 is placed on the step 16e. An annular portion 16f having an inner diameter larger than that of the peripheral wall 4e is provided on the back surface of the mounting table 16b, and the annular plate portion 16f is fitted to the upper end of the peripheral wall 4e, so that the heat plate receiver 16 is provided with a peripheral wall. 4e. When the hot plate receiver 16 is placed on the peripheral wall 4e, the outer peripheral flame hole 18d of the burner 17 described later is surrounded by the guide wall 16c.

  A burner 17 is disposed inside the peripheral wall 4e. The burner 17 includes a double cylindrical portion 18 and a supply pipe 20 that communicates with a space 19 formed between the inner cylindrical portion 18 a and the outer cylindrical portion 18 b of the double cylindrical portion 18. In the inner cylinder part 18a and the outer cylinder part 18b, the inner peripheral flame hole 18c and the outer peripheral flame hole 18d into which the mixed gas of the fuel gas supplied to the supply pipe 20 and the primary air is jetted are directed obliquely upward. It is provided with a plurality. In addition, an inlet 20 a into which primary air is introduced is formed on the bottom surface of the supply pipe 20.

  FIG. 5 shows a perspective view of the burner body 21 and the burner head 22. In the present embodiment, the burner 17 includes a burner body 21 and a burner head 22 shown in FIG. 5, and the burner 17 is formed by mounting the burner head 22 on the burner body 21. It has become.

  The double cylindrical portion 18 is surrounded by the peripheral wall 4e at a distance from the peripheral wall 4e, and the gap between the outer cylindrical portion 18b and the peripheral wall 4e and the inside of the inner cylindrical portion 18a are blown from a fan 27 described later. A flow path 23 for secondary air is formed. Further, the burner 17 is arranged so that the outer peripheral flame hole 18d is positioned above the peripheral wall 4e. When the hot plate receiver 16 is provided on the peripheral wall 4e, the burner 17 is heated by the outer peripheral flame hole 18d. It arrange | positions so that it may be located above the mounting base 16a of the board receptacle 16. FIG. That is, the upper end of the peripheral wall 4e and the upper end of the mounting table 16b are located below the outer peripheral flame hole 18d.

  6A shows a plan view of the burner body 21, FIG. 6B shows a cross-sectional view of the burner body 21 taken along line BB in FIG. 6A, and FIG. 6C shows the burner body 21. The bottom view of is shown. The burner body inner cylinder part 21a, the burner body outer cylinder part 21b, the mixing space 21c formed between the burner body inner cylinder part 21a and the burner body outer cylinder part 21b, and the communicating part 20b with the mixing space 21c And a supply pipe 20 provided on the outer peripheral surface of the burner body outer cylinder portion 21b. The supply pipe 20 and the burner body outer cylinder part 21 b are provided eccentrically, and the supply pipe 20 extends downward from the outer peripheral surface of the burner body outer cylinder part 21. And the inclined part 21d which inclines below is formed in the outer surface of a connection part with the burner body outer cylinder part 21b outer peripheral surface of the supply pipe | tube 20. As shown in FIG. The upper part of the mixing space 21c on the supply pipe 20 side is closed with a plate-like member 21e, and the other upper part of the mixing space 21c is open. As a result, the mixed gas supplied from the supply pipe 20 rises while turning in the circumferential direction in the mixed space 21c.

  Further, the upper end surface 21f of the burner body inner cylinder portion 21a and the upper end surface 21g of the burner body outer cylinder portion 21b each have a tapered surface tapered downward in the outer circumferential direction. Further, two protrusions 21 h are formed on the bottom surface of the burner body 21 near the supply pipe 20.

  Fig.7 (a) shows the front view of the burner head 22, FIG.7 (b) has shown CC sectional view taken on the line of the burner head 22 in Fig.7 (a). The burner head 22 has a burner head inner cylinder part 22a, a burner head outer cylinder part 22b, and a mixing space 22c formed between the burner head inner cylinder part 22a and the burner head outer cylinder part 22b. A notch 22d is provided at the lower end of the burner head outer cylinder portion 22a. A step 22e is formed on the inner wall of the burner head outer cylinder portion 22b so as to incline downward. Further, the upper portion of the mixing space 22c is closed by a cap portion 22f configured integrally with the burner head inner tube portion 22a and the burner head outer tube portion 22b. In the upper part of the burner head outer cylinder portion 22b, a plurality of outer peripheral flame holes 18d facing obliquely upward are formed along the circumferential direction, and a plurality of grooves 22h are formed on the lower end surface 22g of the burner head inner cylinder portion 22a. Are provided along the circumferential direction with the inner side facing obliquely upward.

  As described above, the burner 17 is formed by mounting the burner head 22 on the burner body 21 as shown in FIG. Specifically, the burner head 22 is fitted into the burner body 21 so that the notch 22 d of the burner head 22 is positioned on the inclined portion 21 d of the burner body 21. At this time, the upper end surface 21f of the burner body inner cylinder portion 21a and the lower end surface 22g of the burner head inner cylinder portion 22a, and the upper end surface 21g of the burner body outer cylinder portion 21b and the step provided on the inner wall of the burner head outer cylinder portion 22b. 22e abuts each other. The upper end surface 21f of the burner body inner cylinder portion 21a abuts on the lower end surface 22g of the burner head inner cylinder portion 22a, whereby a plurality of grooves 22h formed in the lower end surface 22g of the burner head inner cylinder portion 22a become the inner peripheral flame. It will be configured as a hole 18c.

  Thus, the burner body inner cylinder part 21a and the burner head inner cylinder part 22a constitute the inner cylinder part 18a of the double cylinder part 18 of the burner 17, and the burner body outer cylinder part 21b and the burner head outer cylinder part. 22 b constitutes the outer cylindrical portion 18 b of the double cylindrical portion 18 of the burner 17, and the mixing space 21 c of the burner body 21 and the mixing space 22 c of the burner head 22 constitute the space 19 of the burner 17.

  As described above, in the present embodiment, the burner 17 is configured to be disassembled into the burner body 21 and the burner head 22, so that the burner 17 can be easily cleaned. Note that the burner 17 may not be configured to be disassembled into the burner body 21 and the burner head 22 but may be configured integrally with the burner body 21 and the burner head 22. Further, the supply pipe 20 is not limited to a configuration extending downward from the outer peripheral surface of the burner body outer cylinder portion 21 but may be configured to extend from the burner body outer cylinder portion 21 in the horizontal direction.

  As shown in FIG. 6B, the inside of the supply pipe 20 of the burner 17 has a throttle portion 20c between the communication portion 20b and the inflow port 20a. Specifically, the inner diameter is continuously reduced from the communicating portion 20b to the throttle portion 20c in the supply pipe 20, and the inner diameter is continuously increased from the throttle portion 20c toward the inlet 20a. It is configured. When the supply pipe 20 is configured as described above, primary air is sucked into the supply pipe 20 due to the venturi effect when the fuel gas is supplied into the supply pipe 20.

  As shown in FIG. 6C, the inflow port 20a formed on the bottom surface of the supply pipe 20 has a fuel gas introduction port 20d having a circular opening mainly for introducing the fuel gas, and a periphery of the fuel gas introduction port 20d. And a primary air inlet 20e formed in a fan-shaped opening. A gas nozzle 24 is inserted into the fuel gas inlet 20 d, and fuel gas is supplied from the gas nozzle 24 into the supply pipe 20. The fuel gas inlet 20d is formed to have a larger diameter than the outer diameter of the gas nozzle 24. Therefore, a gap 20f is formed between the fuel gas inlet 20d and the gas nozzle 24 as shown in FIG. . Therefore, primary air is also introduced from the gap 20f in addition to the primary air inlet 20e.

  8A shows a plan view of the adjustment damper 25, and FIG. 8B shows a cross-sectional view of the adjustment damper 25 taken along the line D-D in FIG. 8A. An adjustment damper 25 for adjusting the supply amount of primary air introduced from the primary air introduction port 20e is attached to the bottom surface of the supply pipe 20. The adjustment damper 25 is configured to be rotatable around the axis of the supply pipe 20. The adjustment damper 25 includes a crown-shaped member, and includes a circular opening 25a having substantially the same diameter as the fuel gas inlet 20d, a fan-shaped opening 25b formed around the circular opening 25a, and a circular opening. And a shielding region 25c which is a region formed around the portion 25a and where the fan-shaped opening 25b is not formed. FIG. 8 illustrates the case where two fan-shaped openings 25b are formed. The adjustment damper 25 is attached to the bottom surface of the supply pipe 20 so that the axis of the circular opening 25a coincides with the axis of the fuel gas inlet 20d. The fan-shaped opening 25b is provided at a position corresponding to the primary air inlet 20e in the radial direction when the adjusting damper 25 is attached to the bottom surface of the supply pipe 20.

  The supply amount of the primary air is performed by rotating the adjustment damper 25 to adjust the opening degree of the primary air introduction port 20e. That is, when the primary air introduction port 20e and the fan-shaped opening 25b are just overlaid, the opening degree of the primary air introduction port 20e is maximized, and the supply amount of primary air is also maximized. Further, when it is desired to reduce the supply amount of the primary air, the adjustment damper 25 is rotated so that the shielding region 25c is positioned on the primary air introduction port 20e, that is, the shielding region 25c blocks the primary air introduction port 20e. Thus, it adjusts so that the opening degree of the primary air inlet 20e may be made small. When the position of the adjustment damper 25 is determined, the adjustment damper 25 is fixed to the bottom surface of the supply pipe 20 by fastening means such as screws. In this way, it is possible to adjust the supply amount of primary air introduced from the primary air inlet 20e.

  FIG. 9A shows a plan view of the housing 26, and FIG. 9B shows a left side view of the housing 26. A casing 26 is disposed below the inner box 4, and a fan 27 (an example of a blowing unit) is provided in the casing 26. An air volume adjusting means 28 for adjusting the air volume is provided at the wind intake port of the fan 27 on the outer surface of the housing 26. The air volume adjusting means 28 in the present embodiment is constituted by a plate-like member provided with a plurality of long hole openings, and the air volume can be adjusted by adjusting the opening area of the long hole openings. The air volume adjusting means 28 is not limited to the configuration in which the plate-like member as described above is attached to the wind inlet of the fan 27, and may be an electrical control means that changes the rotational speed of the blades of the fan 27, for example. Further, the fan 27 is not necessarily provided in the casing 26. For example, the fan 27 is provided outside the casing 26, and the fan 27 and the casing 26 are connected by a pipe so that air is blown into the casing 26. You can also send it.

  The upper surface of the housing 26 has a plurality of openings 26 a communicating with the bottom opening 4 d of the inner box 4. One of the plurality of openings 26 a is an opening 26 b for inserting the supply pipe 20 of the burner 17, and has a larger diameter than the outer diameter of the lower end portion of the supply pipe 20.

  FIG. 10 shows a plan view of the tray 29. A tray 29 is placed on the upper surface of the housing 26, and the tray 29 is substantially the same diameter as the opening 26b (that is, larger in diameter than the outer diameter of the lower end of the supply tube 20). 29a, an arcuate opening 29b, and a protrusion insertion port 29c into which the protrusion 21h of the burner 17 is inserted. The tray 29 is placed on the upper surface of the housing 26 so that the axis of the supply pipe insertion port 29a coincides with the axis of the opening 26b. When the supply pipe 20 is inserted into the supply pipe insertion port 29a, the projection 21h of the burner 17 is fitted into the projection insertion port 29c, so that the burner 17 is supported on the tray 29. Yes. At this time, the gas nozzle 24 provided at the bottom of the housing 26 is inserted into the fuel gas inlet 20d.

  Since the opening 26 b has a larger diameter than the outer diameter of the supply pipe 20, a gap is formed between the opening 26 b and the supply pipe 20. Therefore, the secondary air blown from the fan 27 rises through the gap and the opening 26a. Furthermore, since the supply pipe insertion port 29 a has a larger diameter than the outer diameter of the supply pipe 20, a gap is also formed between the supply pipe insertion port 29 a and the supply pipe 20. Therefore, the secondary air passes through the gap and the arcuate opening 29b, and rises inside the inner cylinder part 18a of the double cylinder part 18 and the gap between the outer cylinder part 18b and the peripheral wall 4e. .

  FIG. 11 is a schematic diagram showing the flow of primary air, fuel gas, mixed gas, secondary air, flame, and hot air flow. The flow of primary air, fuel gas, mixed gas, secondary air, flame and hot air flow will be described with reference to FIG. Arrow U indicates the flow of primary air, arrow V indicates the flow of fuel gas, arrow W indicates the flow of mixed gas, arrow X indicates the flow of secondary air, and arrow Y1 indicates the flame that is ejected from the inner peripheral flame hole 18c. The arrow Y2 represents the flow, the flame flow ejected from the outer peripheral flame hole 18d, and the arrow Z represents the hot air flow.

  Part of the air blown from the fan 27 is forcibly introduced as primary air U into the supply pipe 20 through the primary air inlet 20e of the burner 17 and the gap 20f between the fuel gas inlet 20d and the gas nozzle 24. Is done. The fuel gas V and the primary air U introduced into the supply pipe 20 are mixed in the supply pipe 20 to become a mixed gas W. Then, the mixed gas W rises in the space 19 inside the double cylindrical portion 18 and is ejected from the inner peripheral flame hole 18c and the outer peripheral flame hole 18d.

  The mixed gas W ejected from the inner flame hole 18c and the outer flame hole 18d is ignited by an ignition source (not shown), and flame Y1 and flame Y2 are ejected from the inner flame hole 18c and the outer flame hole 18d, respectively. .

  A part of the air blown from the fan 27 rises as the secondary air X in the gap between the outer cylindrical portion 18b and the peripheral wall 4e of the burner 17 that is the secondary air flow path 23 and the inner cylindrical portion 18a. To go.

  As described above, since the primary air U from the fan 27 is forcibly introduced into the supply pipe 20 as the air is blown from the fan 27, the combustion speed is higher than the jet speed of the mixed gas W in the inner peripheral flame hole 18c. Will surpass. As a result, the fire foot of each flame Y1 ejected from the plurality of inner peripheral flame holes 18c becomes smaller than that when the primary air U is not forcibly introduced into the supply pipe 20. In general, a flame has a property that a fire foot suddenly increases when the flames collide with each other. Since the inner cylinder portion 18a is provided with a plurality of inner peripheral flame holes 18c in the circumferential direction, the flames Y1 ejected from the inner peripheral flame holes 18c are likely to collide with each other. However, in the present invention, since the flames of the respective flames Y1 ejected from the respective inner peripheral flame holes 18c are small, the flames Y1 do not collide with each other. In addition, the flames Y1 ejected from the respective inner flame holes 18c are turned upward by the secondary air rising inside the inner cylinder portion 18a, and the flames Y1 collide with each other further. . Therefore, the fire foot of the flame Y1 ejected from the inner peripheral flame hole 18c is not increased, and the flame Y1 does not directly hit the pan P provided on the pan mounting portion 5a.

  Furthermore, the hot airflow Z heated by the flame Y1 ejected from the inner peripheral flame hole 18c by the secondary air X supplied to the inside of the cylindrical portion 18a is caused from the inside of the hot plate 15 and the central opening 15a of the hot plate 15. Since it is diverted to the upper pan placing part 5a, the heat is not concentrated on the pan placing part 5a but is dispersed. As a result, the temperature of the pan placing part 5a can be lowered by weakening the heating of the pan placing part 5a. Thereby, the overheating of the pan P mounted on the pan mounting part 5a can be suppressed, and the boiling of the liquid in the pan P can be suppressed.

  Further, the secondary air X is forcibly supplied to the inside of the cylindrical portion 18a, so that the flame Y1 ejected from the inner peripheral flame hole 18c promotes combustion and is diverted by the hot plate 15, and the lower surface of the hot plate 15 And then flows to the outer periphery of the hot plate 15. The hot air flow Z generated by the flame Y1 ejected from the inner peripheral flame hole 18c is ejected upward from the opening 15b of the hot plate 15 and the outer peripheral edge of the hot plate 15 to heat the net body 5b. As a result, the heating of the pan placing portion 5a provided in the center is weakened and the temperature is lowered, while the heating of the net 5b provided around the pan placing portion 5a is maintained.

  Further, the secondary air X is forcibly supplied to the gap between the outer cylinder portion 18b and the peripheral wall 4e, so that the hot airflow Z in the hot plate 15 is caused to be sucked by the rising secondary air X and the hot plate 15 is heated. And the flame Y2 ejected from the outer peripheral flame hole also flows to the outer periphery of the hot plate 15. Here, since the mounting table 16b of the hot plate receiver 16 mounted on the peripheral wall 4e has a central opening 16a having a smaller diameter than the peripheral wall 4e, the gap between the outer tube portion 18b and the mounting table 16b. Is narrower than the gap between the outer cylindrical portion 18b and the peripheral wall 4e. Therefore, the suction induction action of the rising secondary air X becomes stronger, and the flow of the hot air flow Z to the outer peripheral edge of the hot plate 15 is accelerated. Then, the hot air flow Z is ejected upward from the outer peripheral edge of the hot plate 15 to heat the net 5b. Further, since the combustion state is made good mainly by supplying the primary air U, the hot air flow Z in a state where the calorific value is increased is guided to the outer peripheral edge portion of the hot plate 15 in a state of being divided into the hot plate 15. As a result, the heating of the net 5b is maintained, and the temperature drop of the net 5b can be prevented.

  The supply amount of the primary air and the secondary air can be adjusted by changing the air volume blown from the fan 27 and the opening degree of the primary air introduction port 20 e by the adjustment damper 25. Then, by adjusting the supply amount of primary air or secondary air, the size of the fire foot of the flame ejected from the inner flame hole 18c and the outer flame hole 18d, the flow velocity of the hot air flow, and the like can be adjusted. As a result, it is possible to adjust the temperature of the pan placing part 5a and the net 5b.

  When the air is not blown from the fan 27, the primary air is naturally sucked from the primary air inlet 20e and the gap 20f between the fuel gas inlet 20d and the gas nozzle 24 due to the venturi effect (natural air supply). It is only done. Further, the secondary air is also only natural suction (natural air supply) generated when the flames ejected from the inner peripheral flame hole 18c and the outer peripheral flame hole 18d consume surrounding air. However, in the present invention, since the primary air and the secondary air are forcibly supplied by blowing air from the fan 27, the above effects can be obtained.

  In the present invention, the guide wall 16c of the hot plate receiver 16 is configured to surround the outer peripheral flame hole 18d. Therefore, the hot airflow Z heated by the flame Y2 ejected from the outer peripheral flame hole 18d is guided upward by the guide wall 16c, ejected from between the outer peripheral edge of the hot plate 15 and the guide wall 16c, and the net body. Heat 5b. As a result, the temperature drop of the net body 5b can be prevented.

  Further, since the guide wall 16b is configured to surround the outer peripheral flame hole 18d, it is possible to suppress the flame Y2 ejected from the outer peripheral flame hole 18d from directly hitting the side wall 4a and overheating the inner box 4. As a result, sticking of dirt due to gravy dripping from the net 5b onto the side wall 4a can be prevented.

[Example 1]
Using the heating cooker 1 shown in FIG. 1, the size of the fire foot of the flame ejected from the burner 17 was compared between when the air was blown from the fan 27 and when it was not. In addition, the comparison method was performed visually.

  As a result, when the air is not blown from the fan 27, the flame ejected from the inner peripheral flame hole 18c is ejected from the central opening 15a of the hot plate 15, the flame hits the bottom surface of the pan bottom of the pan P, and It was confirmed that the flame extended as the flame diverted to the left and right. On the other hand, when forcible ventilation from the fan 27 is performed, the flame ejected from the inner peripheral flame hole 18 c is not ejected from the central opening 15 a of the hot plate 15, and the ventilation from the fan 27 is performed. It was found that the fire foot of the flame ejected from the inner peripheral flame hole 18c was significantly smaller than that in the case where it was not performed.

[Example 2]
Next, heating is performed in a state where the pot P filled with water is placed in the pot placing part 5 a of the cooking part 5, and the pot placing part 5 a and the net 5 b according to the presence or absence of forced ventilation from the fan 27. The temperature change and the boiling state of the water in the pan P were compared. The temperature change was measured by a thermocouple installed on the pan placing part 5a and the net 5b. The boiling state of the water in the pan P was observed visually.

  First, the water in the pan P was boiled by heating with high heat for 10 minutes from the start of heating. Thereafter, the heating power was lowered to medium heat from 10 minutes to 20 minutes, and heating was performed without blowing air from the fan 27. From 20 minutes to 30 minutes, heating was performed while blowing from the fan 27 while maintaining the state of medium heat.

FIG. 12 is a graph showing changes in temperature between the pan placing part 5a and the net body 5b from the start of heating to 30 minutes, with the horizontal axis representing time (minutes) and the vertical axis representing temperature (° C.). In the figure, 30 represents the temperature change of the pan placing part 5a, and 31 represents the temperature change of the net 5b.
(1) Results of heating time from 10 minutes to 20 minutes (thermal power: medium fire, air blow from fan: none)
It can be seen that the temperature of the pan placing portion 5a and the net body 5b are both lowered by lowering the heating power from strong to medium. However, the temperature of the pan placing part 5a did not drop so much, and it was confirmed that the water in the pan P was boiling too much. Moreover, the temperature of the net body 5b has become lower than the net heating appropriate temperature by lowering the heating power to medium heat.
(2) Results of heating time from 20 minutes to 30 minutes (thermal power: medium fire, air blow from fan: yes)
It is possible to further lower the temperature of the pan placing portion 5a by blowing air from the fan 27 while maintaining the state of medium heat, and the water in the pan P is not excessively boiled at this time. It was. On the other hand, the temperature of the mesh body 5b rose compared to the case where the heating time was 10 minutes to 20 minutes, and the vicinity of the appropriate network body heating temperature could be maintained.

  In this way, by forcibly blowing air from the fan 27, the temperature of the pan mounting portion 5a is reduced while maintaining the temperature of the net body 5b even when the heating power is lowered to medium heat. Therefore, it was possible to prevent the water in the pot P from boiling too much.

[Other Embodiments]
In the said embodiment, although the cooking part 5 which comprised the center part by the pan mounting part 5a and the outer peripheral part of the pan mounting part 5a by the net body 5b was demonstrated, the structure of the cooking part 5 is not limited to this. For example, when the central part of the cooking unit 5 is a first cooking part and the outer peripheral part of the first cooking part is a second cooking part, the first cooking part is constituted by an iron plate placing part or a rooster placing part, A cooking part can also be comprised with a net. Moreover, a 1st cooking part can also be comprised with a pan mounting part, and a 2nd cooking part can also be comprised with an iron plate or a rooster. In addition, it is also possible to comprise the cooking part 5 only with an iron plate, a rooster, or a net.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

  The present invention is not limited to a heating cooker capable of simultaneously cooking two or more types in one unit, such as a heating cooker in which the center portion is a pan mounting portion and the periphery of the pan mounting portion is a net, for example, Widely used in cooking devices that can change the intensity of heating between the center and outer periphery of the heating object, such as reducing the heating of the center of the heating object and maintaining the heating of the outer periphery of the heating object Available.

1 Cooking device 2 Table 3 Outer box (second box)
3a Step 4 Inner box (box and first box)
4a Side wall 4b Step 4c Bottom wall 4d Bottom opening 4e Peripheral wall (wall)
5 Cooking portion 5a Pan mounting portion 5b Net body 5c Center opening 5d Ring portion 5e Support wall 5f Step 6 Drain space 7 Top ring 7a Inner annular member 7b Outer annular member 7c Outside air suction port 7d Partition wall 8 Suction space 9 Exhaust gas suction Port 10 Outside air suction channel 11 Exhaust gas suction channel 12 Exhaust channel 13 Filter 14 Exhaust port 15 Hot plate 15a Central opening 15b Slope opening 16 Hot plate receiver 16a Central opening 16b Mounting table 16c Guide wall 16d Support plate 16e Step 16f Annular part 17 Burner 18 Double cylindrical part 18a Inner cylinder part 18b Outer cylinder part 18c Inner flame hole 18d Outer flame hole 19 Space 20 Supply pipe 20a Inlet 20b Communication part 20c Restriction part 20d Fuel gas inlet 20e Primary air Introduction port 20f Clearance 21 Burner body 21a Burner body inner cylinder part 21b Burner body outer cylinder part 21c Mixing space 2 d Inclined portion 21e Plate member 21f Upper end surface 21g of burner body inner cylinder portion Upper end surface 21h of burner body outer cylinder portion Projection portion 22 Burner head 22a Burner head inner cylinder portion 22b Burner head outer cylinder portion 22c Mixing space 22d Notch 22e Step 22f Cap portion 22g Lower end surface 22h of burner head inner cylinder portion Groove 23 Secondary air flow path 24 Gas nozzle 25 Adjustment damper 25a Circular opening 25b Fan-shaped opening 25c Shielding area 26 Housing 26a Opening 26b Opening 27 Fan (Blower) means)
28 Air volume adjusting means 29 Receptacle 29a Supply pipe insertion port 29b Arc-shaped opening 29c Projection portion insertion port 30 Temperature change of pan mounting portion 31 Temperature change P of pan body U Pan U primary air V Fuel gas W Mixed gas X Secondary air Y1 Flame Y2 ejected from the inner flame hole Flame Z ejected from the outer flame hole

Claims (5)

An upper opening box,
Placed in the box body, the center as a pan mounting portion, a cooking portion configured around the pan mounting portion as a net, and
A hot plate disposed below the cooking unit and having a central opening;
A double cylindrical portion, which is arranged below the hot plate and is composed of an inner cylindrical portion and an outer cylindrical portion, communicates with a space formed between the cylindrical portion and the outer cylindrical portion, and for primary air. A burner comprising a supply pipe having an inlet,
A blowing means,
In the inner cylinder part and the outer cylinder part, a plurality of inner and outer flame holes through which a mixed gas of fuel gas and primary air supplied to the supply pipe is ejected are obliquely upward. Provided,
The inner cylinder part inside forms a flow path of secondary air,
The primary air and the secondary air are supplied by the blowing means,
Cooking cooker. A wall portion surrounding at least the outer cylinder portion;
The gap between the outer cylinder part and the wall part forms a flow path of secondary air,
The cooking device according to claim 1. In the box, an annular guide wall that is larger in diameter than the hot plate and surrounds the outer peripheral flame hole is provided,
The cooking device according to claim 1 or 2. An air volume adjusting means for adjusting the air volume of the air blowing means;
The cooking device according to any one of claims 1 to 3. A table and a second box that accommodates the box, wherein the first box and the second box are disposed below the table, and the first box Forming a suction space between the first box and the second box, providing an exhaust gas suction port in the suction space, and forming an exhaust port communicating with the exhaust passage in the second box.
The cooking device according to any one of claims 1 to 4.

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