JP2006029703A - Cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unnecessary heating of temperature detection means with a simple configuration. <P>SOLUTION: A fan 27 for blowing out air upward from each blow-out port 28 by communicating an air supply passage with blow-out ports 28, 28, etc. formed in a bracket 23 is arranged below an inward flame hole burner 4. The plurality of blow-out ports 28 are equally provided on a circumference centering the heat sensitive unit 24 and having predetermined radius and formed to incline slightly to upward of the heat sensitive unit 24. Each blow-out port 28 is arranged to position between flames formed toward the center from each burner port 20 when viewed from an upper face. Consequently, flame of the inward flame hole burner 4 is formed in such a way that a tip part is enlarged onto an upper side of left and right blow-out ports 28 to obtain secondary air and surround the heat sensitive unit 24 so that the heat sensitive unit 24 is heated unnecessarily. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stove that includes an inward flame burner having an annular main body portion having a plurality of flame ports formed on an inner peripheral surface, and that heats a cooking container with the inward flame burner.

In order to prevent a flame from overflowing from the bottom of the cooking vessel to the outside of the stove such as a table stove, an inward flame burner having an annular main body portion having a plurality of flame ports formed on the inner peripheral surface is used. (See, for example, Patent Document 1).
On the other hand, in such a stove, in order to prevent a tempura fire, a temperature detecting means for detecting the pan bottom temperature is provided, and when the pan bottom temperature reaches a set temperature, the controller serving as the combustion control means causes an inward flame burner. A safety device is provided to shut off the supply of fuel gas to the vehicle. As this temperature detecting means, as shown in FIG. 4, a cylindrical body 41 containing a heat sensitive body such as a thermistor is arranged at the center of the inward flame burner 40 so that it can come into contact with the bottom surface of the cooking container P. Things are known.

  However, when this safety device is provided together with the inward flame burner, as shown in the upper part of the figure, a cylinder is formed by a flame F (hatched portion) formed in a narrow combustion space of the inward flame burner 40. The body 41 is easily heated, and the safety device may malfunction. Therefore, as shown in Patent Document 2, a cooling fan for cooling the heat sensitive body is separately provided, the tubular body is made into a double structure, the flame is blocked by the outer protective outer cylinder, and an unnecessary temperature of the heat sensitive body is set. Attempts to prevent the rise and, as shown in Patent Document 3, the cooling body is forcibly cooled by sending cooling air into the cylindrical body having the same double structure to cool the cylindrical body. Attempts have been made to accurately detect.

JP 2001-90911 A Japanese Patent Laid-Open No. 9-101029 JP-A-9-101030

  When the cylindrical body has a double structure, an effect of shielding the heat sensitive body from the flame can be obtained, but the configuration becomes complicated and the cost is increased. Moreover, it becomes easy to transfer heat to other members, such as a bracket which supports a cylindrical body, by heating the outer cylinder for protection, which leads to energy loss. However, if the cylindrical body is to be cooled using only the cooling fan, the flame extends to the center in search of air in a narrow combustion space, and the heat sensitive body cannot be prevented from being heated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stove that can reliably prevent heating of a heat sensitive body without loss of energy with a simple configuration with little increase in cost.

In order to achieve the above object, the invention according to claim 1 supplies secondary air for combustion to the inward flame burner so that the flame formed from the flame mouth avoids the temperature detecting means. It is characterized by this.
In addition to the object of the first aspect, the second aspect of the present invention provides a second combustion chamber to the inward flame burner in order to easily control the supply direction of the secondary air for combustion at a low cost. The secondary air is supplied by a fan.
According to a third aspect of the present invention, in addition to the object of the second aspect, in order to easily form a flame that avoids the temperature detecting means, the secondary air for combustion is separated from the temperature detecting means by a predetermined distance. It is configured to supply from below to above so as to surround.
In addition to the object of the second or third aspect, in order to effectively supply the secondary air at a necessary timing, the invention described in claim 4 supplies the secondary air to an inward flame burner. Is configured to be performed only when burning with a predetermined thermal power.

According to the first aspect of the present invention, it is possible to keep the flame away from the temperature detection means so as not to touch the temperature detection means, so that unnecessary heating of the temperature detection means by the inward flame burner is prevented. . Therefore, the temperature detection means can accurately detect the pan bottom temperature, and can ensure the reliability of the safety device. In particular, this effect can be obtained only by controlling the direction of the secondary air supply by utilizing the property that the flame is formed on the secondary air supply side in search of the secondary air. A double structure makes it possible to prevent cost increase and energy loss, and prevent a malfunction of the safety device at a simple and low cost.
According to the second aspect of the present invention, in addition to the effect of the first aspect, by using the fan, it is possible to easily control the supply direction of the secondary air at a low cost. In addition, since the secondary air is forcibly supplied by the fan, the flame can be shortened, the flame can be prevented from extending to the temperature detecting means, and unnecessary heating can be more effectively prevented.
According to the third aspect of the present invention, in addition to the effect of the second aspect, it is possible to easily form a flame that avoids the temperature detecting means.
According to the fourth aspect of the invention, in addition to the effect of the second or third aspect, the fan can be used only at a necessary timing, which leads to cost reduction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a table stove that is an example of a stove to which the present invention is applied. In the table stove 1, an inward flame burner 4 is disposed in an opening 3 formed in a top plate 2, Above the inward flame burner 4, on the top plate 2, on the top plate 2 is a virtue ring 6 that is open at the center, and on the virtuosity ring 6, an inverted L-shaped gothic claw 7, 7,. The five virtues 5 are set, and the cooking container P can be placed on the five virtue claws 7.
The inward flame burner 4 includes a burner body 8 to which fuel gas and primary air are supplied, and a burner head 9 placed on the burner body 8. First, the burner body 8 includes a mixing tube portion 12 that mixes fuel gas ejected from a gas nozzle 10 provided at a base end and primary air sucked from a primary air suction port 11, and a mounting portion for the burner head 9. And a main body 13 that forms an annular air-fuel mixture chamber 14.

The mixing tube portion 12 and the main body portion 13 are formed by crimping upper and lower metal plates that are press-formed at the end portions, and a flange portion 15 fixed to the upper end of the mixing tube portion 12 is provided on the lower surface of the main body portion 13. They are integrally connected by caulking and coupling at the position of the formed communication hole 16. In addition, a distribution plate 17 is provided in the main body 13 in which a large number of distribution holes 18, 18,.
The burner head 9 includes a flame mouth forming portion 19 in which a strip-shaped metal plate having a plurality of slit-like flame ports 20, 20... Formed in a cylindrical shape, and a weld welded to the upper end of the flame mouth forming portion 19. A ring-shaped weight member 22 coupled by the portion 21, and the flame port forming portion 19 is concentric with the main body portion 13 by placing the weight member 22 at a predetermined position on the main body portion 13. Are assembled to form

On the other hand, a thermal unit 24 as temperature detecting means is supported via a bracket 23 below the main body 13 of the inward flame burner 4. This thermal unit 24 is a unit in which a thermistor 26 serving as a thermal body is accommodated at the upper end in a cylindrical body 25 that is closed and urged upwards, and the cooking container P is placed on the virtuosity claw 7. In the state, the cylindrical body 25 comes into contact with the bottom center of the cooking container P.
A fan 27 is disposed below the inward flame burner 4. The fan 27 has its air supply path connected to the air outlets 28, 28,... Formed in the bracket 23 so that air can be blown upward from the air outlets 28. Are equally provided on the circumference centered on the thermal unit 24 by a predetermined distance from the thermal unit 24 and directed upward of the thermal unit 24, that is, toward the center of the inward flame burner 4. It is formed with a slight inclination. Furthermore, each blower outlet 28 is arranged so that it may not be located in the up-down direction on the line pulled from each flame mouth 20 by the side of the burner head 9 to the center direction of the flame mouth formation part 19. FIG. That is, each outlet 28 is located between the flames formed from the respective flame outlets 20 toward the center as viewed from above.

  Further, on the upstream side of the gas nozzle 10, a control unit 29 that opens and closes a gas supply path in conjunction with the operation of an ignition button (not shown) is provided. The control unit 29 is operated by sliding the knob 30. A well-known heating power adjusting means for changing the opening degree of the gas flow path to the inward flame outlet burner 4 by rotating an adjustment valve (not shown) of the inside, and opening the valve in conjunction with the ignition operation. After combustion, a safety valve (not shown) is provided which is held open by energization from the controller 31 as combustion control means. The controller 31 obtains the temperature detection signal from the thermistor 26, and when the temperature of the thermistor 26 reaches the set temperature, the controller 31 stops energizing the safety valve in the control unit 29 and supplies gas to the inward flame burner 4. It constitutes a known safety device that shuts off. The controller 31 also detects the amount of operation by the knob 30 and controls the rotation of the fan 27.

  In the table cooker 1 configured as described above, when the cooking container P is placed on the virtues 5 and an ignition button (not shown) is pressed, fuel gas is ejected from the gas nozzle 10, and the mixing tube portion of the burner body 8. 12, the air-fuel mixture flows into the main body 13 and diffuses evenly in the air-fuel mixture chamber 14 by the distribution plate 17, and is then ejected from each flame port 20 of the burner head 9 toward the center. And it is ignited by operation | movement of the igniter which is not shown in figure, a flame is formed in the radial direction of the burner head 9 from each flame opening 20, and the cooking container P is heated. The high-temperature combustion gas generated by the combustion of the inward flame burner 9 moves upward and comes into contact with the bottom of the cooking container P, and then spreads radially along the bottom. It is discharged from the gap between them. The cooking container P is also effectively heated by the movement of the combustion gas. Note that the secondary air for combustion is naturally sucked from the gaps between the top plate 2 and the five virtue rings 6 and the inward flame burner 4 by the draft force generated by the movement of the combustion gas.

  When the heating power is adjusted by operating the knob 30, the controller 31 rotates the fan 27 and blows air obliquely upward from each outlet 28 if the selected heating power is “medium” or more. Then, as shown in FIG. 2, the flame F formed in the radial direction in the narrow combustion space in the burner head 9 has a tip portion that seeks secondary air and moves upward in the blowing direction of the left and right outlets 28. It spreads to the left and right (the hatched part is the flame F), and it looks like the thermal unit 24 is surrounded. That is, the flame F is kept away from the thermal unit 24 so as not to touch the thermal unit 24. Therefore, the flame F is formed so as to avoid the thermal unit 24, and the thermal unit 24 is not directly heated by the flame F.

  Thus, according to the table stove 1 of the said form, the secondary air for combustion to the inward flame burner 4 is supplied so that the flame F formed from the flame mouth 20 may avoid the thermal unit 24. Thus, unnecessary heating of the thermal unit 24 by the inward flame burner 4 is prevented. Therefore, the thermal unit 24 can accurately detect the temperature at the bottom of the pan, and can ensure the reliability of the safety device. In particular, this effect can be obtained only by controlling the direction of the secondary air supply by utilizing the property that the flame is formed on the secondary air supply side in search of the secondary air. The double structure eliminates the cost increase and energy loss, and the safety device can be prevented from malfunctioning easily and at low cost.

In particular, here, since the fan 27 is used to supply the secondary air, the control of the direction of supplying the secondary air can be easily performed at a low cost. Moreover, since the secondary air is forcibly supplied by the fan 27, the flame can be shortened, and the flame can be prevented from extending to the thermal unit 24, thereby preventing unnecessary heating more effectively. .
Further, since the secondary air from the fan 27 is supplied upward from a lower position surrounding the thermal unit 24, a flame that avoids the thermal unit 24 can be easily formed.
Furthermore, the supply of secondary air by the fan 27 is performed only when the thermal power of the thermal unit 24 is “medium” or higher, so that the fan 27 can be used only when necessary, thereby reducing costs. Connected.

  The supply direction of the secondary air is not limited to the above-described one. For example, the structure in which the inward flame outlet burns from the lower side to the upper side as in the above embodiment is the same, and the outlet is arranged around the inward flame burner. A structure that is inclined by a predetermined angle in the direction may be employed. In this case, as shown in FIG. 3, the flame F in the burner head 9 a is pulled by the flow of the inclined secondary air, swivels around the thermal unit 24, and deviates from the thermal unit 24.

Further, the secondary air is not limited to the structure in which the inward flame outlet burner 4 is blown upward from the inward flame burner 4 as in the above-described embodiment. For example, the secondary air is blown from the outer peripheral side of the burner head between the burner head and the five virtue rings. A structure in which the flame is formed near the outer periphery of the cooking container or is blown out in a swivel shape inclined at a predetermined angle in the circumferential direction from the same position so that the flame is displaced from the central thermal unit is also possible. It is also conceivable to avoid the thermal unit by blowing out from between the cooking container and the five virtue rings and pulling up the flame. Of course, these units may be combined to avoid the thermal unit.
On the other hand, the supply of secondary air is not necessarily limited to that using a fan, and it is also possible to supply secondary air so that the flame avoids the temperature detection means only by setting the position and direction of the passage of the secondary air. is there.

Further, in the above embodiment, the blow holes are arranged so that the round holes are arranged in the circumferential direction so as to surround the thermal unit, but a plurality of through holes are arranged so as to surround the central thermal unit with an arc shape or an oval shape. It is also possible to blow out secondary air like a wall.
In addition, the specific structures of the heat-sensitive unit and the inward flame burner are not limited to the above forms, and can be changed as appropriate.

The present invention is not limited to a table stove used by being placed on a cooking table, but can be applied to a built-in stove used by being incorporated in a cooking table.

It is explanatory drawing of a table stove. It is explanatory drawing which shows the formation state of the flame within a burner head. It is explanatory drawing which shows the formation state of the flame in the burner head in the example of a change. It is explanatory drawing which shows the formation state of the flame in the conventional burner head.

Explanation of symbols

1. Table cooker, 2. Top plate, 4. Inward flame burner, 5. Gotoku, 8. Burner body, 9. Burner head, 13. Body part, 20. Flame port, 24. Thermal unit, 25. Tube 26, thermistor, 27, fan, 28, outlet, 29, control unit, 30 knob, 31 controller, P, cooking container.

Claims (4)

An inward flame burner having an annular main body portion having a plurality of flame ports formed on the inner peripheral surface, a temperature detecting means for detecting a pan bottom temperature at the center of the main body portion of the inward flame burner, and its temperature A stove that includes a combustion control means that monitors the temperature detected by the detection means and shuts off the supply of fuel gas to the inward flame burner when the detected temperature reaches a set temperature;
A stove for supplying secondary air for combustion to the inward flame burner so that a flame formed from the flame mouth avoids the temperature detecting means.   The stove according to claim 1, wherein the secondary air for combustion to the inward flame burner is supplied by a fan.   The stove according to claim 2, wherein the secondary air from the fan is supplied from below to above so as to surround the temperature detection means by a predetermined distance. The stove according to claim 2 or 3, wherein the secondary air is supplied by the fan only when the inward flame burner is burning with a predetermined heating power.

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