JP2006162202A - Gas cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make both compatible with an excellent cooking environment and energy-saving by an improvement in heat efficiency and reduction in electric power consumption. <P>SOLUTION: Combustion exhaust gas is exhausted from an exhaust port 60 by rotating an exhaust fan 46, when an exhaust quantity increases, by arranging the exhaust fan 46 driven by electromotive force of a thermoelectric element 50 heated by a burner 20. Since the combustion exhaust gas is not sucked in the initial stage of ignition, not only a cooking vessel bottom surface but also a side surface can be sufficiently heated, and when a discharge quantity of the combustion exhaust gas increases, the cooking environment is not deteriorated by driving the exhaust fan 46. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stove that discharges combustion exhaust of a burner by an exhaust fan.

2. Description of the Related Art Conventionally, in the field of gas stoves, it is known that combustion exhaust from a burner is sucked by a fan and discharged from an exhaust port at the rear of the vessel.
For example, in Patent Document 1, a combustion chamber is provided under the opening formed in the top plate, and a cooking vessel is placed over the combustion chamber so as to close the upper portion of the combustion chamber so that combustion exhaust is not discharged to the user side. I have to.

JP 7-318064 A

Originally, in this gas stove, the combustion gas is sucked by the fan as it is before exchanging heat with the cooking container well, so the heat efficiency is poor. The rise of heating to becomes worse.
Further, since a dry battery or a commercial power source is used to drive the fan, it is far from energy saving.

  Accordingly, an object of the present invention is to achieve comprehensive energy saving such as improvement of thermal efficiency and reduction of consumed electricity.

In order to achieve the above object, the invention described in claim 1
A burner for heating the cooking vessel;
A gas stove provided with an exhaust fan that sucks the combustion exhaust of the burner after heating the cooking vessel and guides it to a predetermined exhaust port,
The gist is that the exhaust fan is driven by an electromotive force of a thermoelectric generator heated by the burner.
The invention according to claim 2 is the invention according to claim 1,
The gist is to collect the combustion exhaust discharged from the outer periphery of the virtues on which the cooking container is placed and to suck it by the exhaust fan.

According to the first aspect of the present invention, since the electromotive force generated by the thermoelectric generator is small at the start of combustion, the combustion exhaust after heating the cooking vessel is not sucked by the fan and the bottom surface of the cooking vessel is sufficient. After being heated, it is released around the cooking container.
As the combustion time of the burner increases, the amount of combustion exhaust gas increases. However, since the electromotive force generated by the thermoelectric generator increases in proportion to this, the fan rotates accordingly. For this reason, the generation amount of combustion exhaust gas and the rotation operation of the fan balance, and the combustion exhaust gas can be sucked and discharged from the exhaust port with an appropriate exhaust gas amount.
Therefore, it is possible to suppress the outflow of exhaust gas to the cooker to the extent that there is no hindrance, and it is possible to improve the thermal efficiency at the start of cooking without requiring a dry battery or a commercial power source for driving the fan.
Further, according to the invention described in claim 2, since the combustion exhaust discharged from the outer periphery of the virtues is collected and sucked, the combustion gas exchanges heat with the entire bottom surface of the cooking vessel, and exchanges heat with the cooking vessel. It is possible to compensate for the disadvantage of the conventional stove that is discharged as it is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a table stove 1 that is an example of a gas stove. A stove burner 20 is disposed at the center position of an opening 3 formed in the top plate 2. A ring-shaped annular exhaust pipe 40 to be described later is provided so as to surround the stove burner 20. 5 is a virtues placed on the upper surface of the annular exhaust pipe 40, and the cooking container P is placed on the virtues 5. In addition, a juice receiving tray 4 is placed on the inner peripheral edge of the annular exhaust pipe 40.
The stove burner 20 is a Bunsen combustion type burner in the present embodiment, and is a cylindrical burner body 21 having a flange 22 around its upper end and a cylindrical shape having a number of flame ports 24, 24,. It consists of a burner head 23. A gas nozzle 8 for ejecting fuel gas is provided at the gas inlet of the burner body 21. The gas pipe connected to the gas nozzle 8 includes, from the upstream side, a magnet solenoid valve 9 serving as a safety valve, a main valve 10, and a needle valve 11 that adjusts the gas flow path by a heating power adjustment lever 12 provided in front of the table stove 1. Each is provided.
The magnet solenoid valve 9 constitutes a turn-off safety device that is held open during combustion by the thermoelectromotive force of a thermocouple (not shown) provided near the burner 20.

  Further, the outer periphery of the burner body 21 below the flange 22 of the stove burner 20 and the lower surface of the juice receiving tray 4 and the lower surface of the five virtue ring 15 of the five virtue 5 described later are covered with a heat insulating material, for example, ceramic wool 14, 14,. Yes.

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

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

  On the other hand, the five virtues 5 are bent in a ring shape with the inner peripheral edge and the outer peripheral edge facing downward, and the upper virtue ring 15 has a gently inclined surface that becomes higher as it goes to the outer periphery, and on the five virtue rings 15 in the vertical direction. It consists of eight partition walls 16, 16,. The virtues 5 are placed on the upper surface of an annular exhaust pipe 40 (to be described later) provided in the container at the outer peripheral edge thereof. As shown in FIGS. 3 and 4, the partition wall 16 is erected in an arc shape on the upper surface of the virtually ring 15 from the inner tip to the outer rim tip and is integrated with the virtually ring 15. Moreover, each partition wall 16 is arrange | positioned according to each direction so that it may become the spiral shape centering on the stove burner 20, and an upper end is formed at the same height so that the cooking container P can be mounted, cooking It comes into contact with the bottom surface of the container P in a spiral line shape and also serves as a virgin claw that supports the cooking container P.

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

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

As shown in FIGS. 5 and 6, the swirl blades 37 are formed in an arc shape when viewed from above, like the partition wall 16 of the virtually ring 15, and each has a spiral shape with the conoburner 20 as the center. The swirl vanes 37 are connected to the combustion gas passage 34 of the virtually ring 15.
Thus, the combustion flame ejected from the flame opening 24 of the burner head 23 is turned obliquely upward between the swirling blades 37 and 37 of the swirling blade ring 35 and swung in the tangential direction of the cylindrical outer peripheral surface of the burner head 23. Thus, the combustion gas passage 34 of the five virtue ring 15 and a series of combustion guide passages 38, 38,... Are formed.
In addition, the top view of a stove part is shown in FIG.

As shown in FIGS. 1 and 7, a thermoelectric generator 50 is provided between the flame mouth 24 forming surface of the burner head 23 and the swirl vane ring 35.
This thermoelectric generator 50 uses a series thermocouple, and alternately includes rod-shaped first metal members 51 (made of stainless steel in this embodiment) and second metal members 51 (made of constantan in this embodiment). The upper end and the lower end are alternately welded and connected in a zigzag shape. At this time, in order to insulate the metal members 51 and 52, a sheet-like heat-resistant insulator (not shown) is interposed between them.
The thermoelectric generator 50 is inserted and fixed to the flange 22 of the burner 20 with an insulator interposed therebetween, and the upper end side welded portion 53 serving as a hot junction faces the flame opening 24 and the lower end side serving as a cold junction. The weld 54 is exposed below the flange 22.
In this case, the thermoelectric power generation element 50 is maintained at a low temperature because the cold junction is shielded from heat from the burner by the heat insulating material 14, and a high electromotive force can be obtained due to the temperature difference.

An annular exhaust pipe 40 for sucking combustion exhaust and sending it to the exhaust port 60 is provided below the outer periphery of the virtues 5. The annular exhaust pipe 40 is formed by opening the center of a double pipe and forming an exhaust passage 41 between the outer pipe 40a and the inner pipe 40b. An exhaust suction port 43 is formed.
Furthermore, a ring-shaped cover cover 44 (see FIGS. 8 and 9) that covers the exhaust suction port 43 of the annular exhaust pipe 40 from above is fitted to the outer periphery of the virtues 5. A plurality of cover covers 44 having different opening diameters are prepared, and selected according to the diameter of the cooking container P so that the combustion exhaust does not pass upward. A plurality of small exhaust outlets 45 are provided on the cylindrical side surface of the cover cover 44.
The annular exhaust pipe 40 is connected to the suction port of the exhaust fan 46, and the exhaust pipe 47 is connected to the air blowing port of the exhaust fan 46. The exhaust pipe 47 communicates with an exhaust port 60 provided at the rear of the appliance so that the exhaust does not flow out to the cooker side, but may be connected to a duct leading to an exhaust port outside the body such as a ventilation fan. . Moreover, you may face a grill exhaust port if it is a thing with a built-in grill.

  The exhaust fan 46 is driven using the electromotive force of the thermoelectric generator 50 as a power source. In the present embodiment, when the electromotive force of the thermoelectric generator 50 reaches a predetermined voltage or higher via the fan drive circuit 55 that operates by the electromotive force of the thermoelectric generator 50, the drive voltage is applied to the exhaust fan 46 (motor). Configure to apply.

In the table stove 1 equipped with the stove burner 20 configured as described above, when the cooking container P is placed on the five victories 5, the upper is the bottom surface of the cooking container P, and the lower is the five virtue rings 15 and swirl blades of the five virtues 5. Combustion spaces closed by the small ring plates 36 of the ring 35 are formed, and the combustor 20 and the outer peripheral side of the Gotoku 5 are combusted between the combustion guide passage 38 between the swirl vanes 37 and 37 and the partition walls 16 and 16. The gas passage 34 communicates.
Here, when an unillustrated ignition button provided on the front surface of the table stove 1 is pressed, the main valve 10 and the magnet electromagnetic valve 9 are forcibly opened to supply fuel gas to the stove burner 20, and accordingly, the gas nozzle 8 Combustion air is sucked from the surroundings of the gas, and air-fuel mixture is ejected from the flame opening 24 and ignited by an igniter (not shown).

  The combustion flame F ejected and burned from each flame outlet 24 is heated from the burner head 23 because it contacts the swirl blades 37 of the outer swirl blade ring 35 while heating the hot contact of the thermoelectric generator 50. Without being swirled, the swirl blades 37 are formed in a spiral shape swirling in the tangential direction of the outer ring. Therefore, the combustion gas is also led directly to the outer periphery of the swirl vane ring 35 through the combustion guide passage 38 between the swirl vanes 37.

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

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

  The combustion gas that has passed through the combustion gas passage 34 between the Gotoku ring 15 and the cooking vessel P is not directly driven because the exhaust fan 46 is not driven because the thermoelectric power of the thermoelectric generator 50 is small at the beginning of combustion. It is discharged through the outlet 45 and around the cooking container. In this case, since the amount of combustion exhaust is still small, there is no problem for the cook. In addition, since the combustion exhaust effectively heats not only the entire bottom surface of the cooking container but also the side surface of the cooking container, the exhaust heat can be effectively used for heating the cooking container, and the rise of heating (the temperature of the cooking object rises) ) Is fast.

When combustion continues and the amount of combustion exhaust increases, the electromotive force of the thermoelectric generator 50 becomes equal to or higher than a predetermined voltage, and a drive voltage corresponding to the thermoelectromotive force is applied from the fan drive circuit 55 to the exhaust fan 46. Therefore, the combustion exhaust is sucked into the annular exhaust pipe 40 from the exhaust suction port 43 by the suction force of the exhaust fan 46, sent to the exhaust port 60, and discharged.
Further, since the generated electromotive force of the thermoelectric generator 50 is also adjusted in accordance with the heat generation amount of the burner 20 that is adjusted in thermal power, the rotational speed of the exhaust fan 46 corresponding to the exhaust amount of combustion exhaust gas is obtained, and the generation of exhaust gas The amount and the intake amount can be well balanced.
At this time, a part of the combustion exhaust gas may flow out from the exhaust outlet 45 to the outer periphery of the cooking container P. In this case, the rise of the combustion exhaust gas (draft force) can guide the steam of oil scattered from the food to the upper ventilation fan.

Thus, according to the table stove 1 of the said form, since combustion exhaust does not flow out to a user side by sending the combustion exhaust of the stove burner 20 to the predetermined exhaust port 60, not only a use environment becomes favorable. In addition, a dry battery or a commercial power source for driving the exhaust fan 46 is not required, and thermal efficiency at the start of cooking can be improved.
As a result, it is possible to achieve both comprehensive energy saving including fuel cost and electricity cost and good environmental maintenance.
Moreover, since the table stove 1 of this embodiment can heat favorably over the whole cooking bottom face with respect to the conventional stove mentioned in patent document 1, the thermal efficiency is also high in that respect. That is, in the conventional stove, the combustion chamber provided with the burner is covered with a cooking vessel from above, and the combustion gas in the combustion chamber is sucked with the exhaust fan, so the combustion gas does not sufficiently exchange heat with the bottom of the cooking vessel. Since it is sucked as exhaust gas, and the combustion gas does not touch the outer peripheral portion of the cooking vessel, the thermal efficiency is poor. On the other hand, in this embodiment, since the cooking container is mounted on the virtues 5 and the combustion exhaust gas is discharged from the outer peripheral portion of the virtues 5, heat exchange with the entire bottom surface of the cooking containers can be performed.

In addition, a plurality of partition walls 16 that partition the combustion gas passage 34 are erected on the Gotoku ring 15 in a direction different from the radial direction of the Gotoku ring 15, and the partition wall 16 has a distance from the adjacent partition wall 16. By setting it to become narrower as it goes away from the center of the stove burner 20, heat diffusion with the cooking vessel P is prevented by preventing diffusion of combustion gas even outside the combustion space where the temperature decreases due to heat exchange with the cooking vessel P. The thermal efficiency can be effectively improved.
Moreover, since the partition wall 16 is formed in a spiral shape when viewed from above, the contact distance with the bottom surface of the cooking container P can be kept long, and the thermal efficiency can be further improved. Further, since the distance between the adjacent partition walls 16 can be easily adjusted, the passage cross-sectional area of each combustion gas passage 34 can be easily adjusted so that the heat flow does not diffuse.

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

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
For example, in this embodiment, the Bunsen combustion method is employed in which combustion air is sucked at a negative pressure due to the fuel gas jet output. However, a forced combustion method in which combustion air is forcibly supplied to the burner by an air supply fan is employed. May be.
Note that the present invention is intended to save power in the exhaust fan, and is not necessarily limited to the one that covers all the power source necessary for the gas stove by thermal power generation.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table stove 20 Comb burner 40 Annular exhaust pipe 41 Exhaust passage 45 Exhaust outlet 46 Exhaust fan 47 Exhaust pipe 50 Thermoelectric generation element 60 Exhaust outlet

Claims (2)

A burner for heating the cooking vessel;
A gas stove provided with an exhaust fan that sucks the combustion exhaust of the burner after heating the cooking vessel and guides it to a predetermined exhaust port,
The gas stove, wherein the exhaust fan is driven by an electromotive force of a thermoelectric generator that is heated by the burner.   The gas stove according to claim 1, wherein combustion exhaust discharged from the outer periphery of the virtues on which the cooking container is placed is collected and sucked by the exhaust fan.

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