JP2004060976A - Stove burner with pan bottom temperature sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stove burner provided with a pan bottom temperature sensor 10, wherein an air supply cylinder 14 for supplying air from a blower 6 to an inside of a heat shielding cylinder 13 surrounding the pan bottom temperature sensor 10 is inserted, and the air is forcibly sent from an upper end part of the heat shielding cylinder 13 into a space between the heat shielding cylinder 13 and the air supply cylinder 14 toward an outlet part 13a on a lower end, capable of shortening a frame by effectively utilizing the air from the outlet part 13a of which a temperature is increased by heat exchange with the heat shielding cylinder 13 as secondary air for combustion. <P>SOLUTION: A air guiding passage 17 for communicating with the outlet part 13a on the lower end of the heat shielding cylinder 13 is provided. A supply opening 17a of the air from the air guiding passage 17 is arranged directly beneath a burner port 3b of a gas burner 3. When the gas burner 3 is an inner flame type burner and a drip pan 8 is arranged below a space surrounded by the burner, a plate shaped supporting member 9 for supporting the drip pan 8 in a floating state is provided on a lower side of the drip pan 8, and the air guiding passage 17 is formed by a space between the drip pan 8 and the supporting member 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas stove provided with a gas burner and a pan bottom temperature sensor in contact with a bottom surface of a cooking vessel heated by the gas burner.
[0002]
[Prior art]
In this type of gas stove, empty cooking prevention and cooking temperature control are performed based on the temperature detected by the pan bottom temperature sensor, but when the flame or hot air from the gas burner reaches the pan bottom temperature sensor, the detected temperature becomes the temperature of the cooking vessel. It becomes higher, and it becomes impossible to prevent empty cooking and control the cooking temperature properly.
[0003]
In order to solve such a problem, there is known an apparatus in which a heat shield cylinder surrounding a pan bottom temperature sensor is provided to prevent the flame or hot air of the gas burner from reaching the pan bottom temperature sensor with the heat shield cylinder. However, when the gas burner is an annular internal flame type burner, the heat shield cylinder itself is heated to a high temperature by the flame of the gas burner, and the temperature detected by the pan bottom temperature sensor increases due to the influence of radiant heat from the heat shield cylinder.
[0004]
Therefore, conventionally, as shown in Japanese Patent Application Laid-Open No. 9-101029, a heat shield cylinder surrounding a pan bottom temperature sensor is provided, and an air supply cylinder for supplying air from a blower is inserted into the heat shield cylinder to provide heat shield. Air is forced to flow from the upper end of the heat shield cylinder to the outlet at the lower end of the heat shield cylinder in the gap between the cylinder and the air supply cylinder, air-cools the heat shield cylinder, and the heat shield cylinder for the pan bottom temperature sensor. There is also known an apparatus capable of eliminating the influence of radiant heat from the air. In this case, a casing for accommodating a gas burner is provided, and air is caused to flow into the casing from an outlet at the lower end of the heat shield cylinder, and a part of this air is used as secondary air for combustion of the gas burner. You.
[0005]
[Problems to be solved by the invention]
By the way, if the flame reaches the bottom surface of the cooking vessel and is cooled during the combustion reaction, the combustion state becomes unstable, so that the distance between the gas burner and the bottom face of the cooking vessel cannot be reduced much. Therefore, in order to shorten this distance and improve the thermal efficiency, it is desired to increase the combustion speed and shorten the flame. When the temperature of the secondary air for combustion is increased, the combustion speed is increased. Here, since the temperature of the air used for air cooling of the heat shield cylinder is raised by heat exchange with the heat shield cylinder, it is possible to shorten the flame by using this air as the secondary air for combustion.
[0006]
However, in the above conventional example, since the outlet at the lower end of the heat shield cylinder is separated from the flame hole of the gas burner, the air used for air cooling of the heat shield cylinder is used as secondary air for combustion. It becomes extremely small, and the effect of shortening the flame cannot be obtained.
[0007]
In view of the above, an object of the present invention is to provide a gas stove with a pan bottom temperature sensor that can shorten the flame by using air used for air cooling of a heat shield cylinder.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a gas stove including a gas burner and a pan bottom temperature sensor in contact with a bottom surface of a cooking vessel heated by the gas burner, and providing a heat shield cylinder surrounding the pan bottom temperature sensor, Insert the air supply cylinder that supplies air from the blower into the heat shield cylinder, and force it from the upper end of the heat shield cylinder to the outlet at the lower end of the heat shield cylinder in the gap between the heat shield cylinders In an apparatus that allows air to flow in a specific manner, an air guide path communicating with the outlet at the lower end of the heat shield cylinder is provided, and the air outlet from the air guide path is disposed immediately below the flame hole of the gas burner.
[0009]
According to the above configuration, the air that has flowed out of the outlet at the lower end of the heat shield cylinder is blown out toward the flame hole of the gas burner from the blow-out hole immediately below the gas burner. Therefore, the air heated by the heat exchange with the heat shield cylinder is efficiently used as the secondary air for combustion, the combustion speed is increased, and the flame is shortened.
[0010]
By the way, in a gas stove using an annular internal flame type burner as a gas burner, a juice tray is arranged below a space surrounded by the burner so that a boiled spill falling from a stove opening of a top plate can be received by the juice tray. In this case, a dish-shaped support member that floats and supports the juice receiving tray is provided below the juice receiving tray, and the air guiding path is formed by a gap between the juice receiving tray and the supporting member. It can be used as a component of the system and is rational. Further, the juice receiving tray becomes considerably high in temperature due to the radiant heat from the gas burner flame, and there is a possibility that the boiling point may be burned. However, when the air guide path is configured in this manner, the juice receiving tray is also air-cooled, and it is possible to prevent the burning of the spill.
[0011]
The outer diameter of the juice receiving tray is slightly smaller than the circle in which the burner holes are arranged so that it can be removed upward. Therefore, if the supporting member is formed to be larger in diameter than the juice receiving tray and a gap is secured between the rising wall on the outer circumference of the juice receiving tray and the rising wall on the outer circumference of the supporting member, this gap is located immediately below the flame hole. I do. Therefore, if the outlet is formed by this gap, a component for the outlet does not need to be separately provided, and the cost can be reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a top plate of a gas stove, which is made of heat-resistant glass such as ceramic glass. A cooking stove opening 2 is opened in the top plate 1, a gas burner 3 faces the cooking stove opening 2, and a cooking vessel P to be placed on the top plate 1 via the gotoku 4 is stood up through the cooking stove opening 2. Heat with the flame. The gas burner 3 is constituted by an internal flame type burner which is disposed below the glass top plate 1 and has a plurality of inwardly directed flame holes 3b formed in an annular burner head 3a concentric with the stove opening 2. . The gas burner 3 is provided with a thermocouple 3c for detecting a flame and an ignition electrode (not shown), and further provided with a burner cover 5 located above the burner head 3a. A protective member 2a for preventing cracks is attached to the opening edge of the stove opening 2.
[0013]
Gotoku 4 is formed by attaching a plurality of gotoku claws 4b to an annular gotoku frame 4a, and is formed relatively low in order to improve the thermal efficiency. The secondary air for combustion of the gas burner 3 is forcibly supplied by the blower 6 so as not to cause the problem. To describe this in detail, a casing 7 for accommodating the burner head 3a is provided so as to be in contact with the lower surface of the glass top plate 1 via a packing 7a, and air is blown from the blower 6 into the casing 7 to the flame hole 3b. Secondary air for combustion is forcibly supplied from above and below the burner head 3a. In addition, a part of the air blown into the casing 7 is guided to the upper surface of the top plate 1 through the upper gap of the burner cover 5 and the lower gap of the virtue frame 4a, and the upper surface of the top plate 1 is air-cooled. I can do it.
[0014]
In the casing 7, there is further disposed an annular juice receiving tray 8 that is located below the space surrounded by the burner head 3 a and that receives the boiling spill from the stove opening 2. The juice tray 8 is floated and supported by a support member 9 provided below the juice tray 8, as will be described in detail later.
[0015]
Further, the pan bottom temperature sensor 10 is supported by the support member 9 so as to be urged upward by a spring 11 as will be described in detail later. The pot bottom temperature sensor 10 is ensured to be in contact with the bottom of the cooking vessel P. A pipe 12 extending downward is connected to the pot bottom temperature sensor 10, and a sensor lead wire is inserted through the pipe 12. The pan bottom temperature sensor 10 and the pipe 12 are surrounded by a heat shield tube 13 that extends upward through the inner periphery of the juice receiving tray 8 so that the flame and hot air of the gas burner 3 do not reach the pan bottom temperature sensor 10. .
[0016]
An air supply cylinder 14 that supplies air from the blower 6 as described later is inserted into the heat shield cylinder 13. The air supply cylinder 14 is urged and supported upward by the spring 11 on the support member 9, and a plurality of inwardly bent claws 14 a in the circumferential direction are formed at the upper end of the air supply cylinder 14 to be fixed to the outer periphery of the pan bottom temperature sensor 10. An inner bending claw 14a is fixed to the lower end of the spacer ring 10a so that the pot bottom temperature sensor 10 is urged upward by the spring 11 via the air supply cylinder 14.
[0017]
At the center of the bottom surface of the support member 9, an air introduction tube 15 extending in an outlet duct 6 a of the blower 6 connected to the center of the bottom surface of the casing 7 is vertically provided. A cylindrical spring guide 16 for supporting the spring 11 is provided on the bottom surface of the support member 9 so as to surround the open end of the air introduction cylinder 15, and the lower end of the air supply cylinder 14 slides on the spring guide 16. It is fitted outside freely. Thus, a part of the air from the blower 6 is introduced into the air supply cylinder 14 via the air introduction cylinder 15.
[0018]
At the upper end of the heat shield cylinder 13, a lid 13b composed of an inwardly bent flange connected to the upper end of the spacer ring 10a on the outer periphery of the pan bottom temperature sensor 10 is provided. An opening 14b at the upper end of the air supply cylinder 14 is communicated with a gap between the heat shield cylinder 13 and the air supply cylinder 14. As a result, air is forced to flow from the upper end of the heat shield cylinder 13 to the outlet 13 a at the lower end of the heat shield cylinder 13 in the gap between the heat shield cylinder 13 and the air supply cylinder 14. Since the heat shield cylinder 13 is air-cooled in this manner, the influence of radiant heat from the heat shield cylinder 13 on the pan bottom temperature sensor 10 is also eliminated, and the temperature of the cooking vessel P can be accurately detected by the pan bottom temperature sensor 10. .
[0019]
Even if the lid 13b is not provided, if the upper end of the heat shield cylinder 13 is brought into contact with the bottom surface of the cooking vessel P, the air from the air supply passage 14 is supplied between the heat shield cylinder 13 and the air supply cylinder 14. Can lead to voids. However, in this case, the air from the air supply passage 14 comes into contact with the bottom surface of the cooking container P, and the bottom surface of the cooking container P is forcibly air-cooled in the vicinity of the pan bottom temperature sensor 10, so that the thermal efficiency decreases and the temperature distribution decreases. A bad effect such as unevenness occurs. On the other hand, if the lid 13b is provided as described above, the air from the air supply cylinder 14 flows into the gap between the heat shield cylinder 13 and the air supply cylinder 14 without touching the bottom surface of the cooking vessel P. However, when the lid 13b contacts the bottom surface of the cooking vessel P, the bottom surface is indirectly air-cooled via the lid 13b. Therefore, in the present embodiment, the lid 13b is provided so that the upper end of the pan bottom temperature sensor 10 is exposed above the lid 13b, so that a gap is formed between the lid 13b and the bottom of the cooking vessel P. Therefore, the bottom surface of the cooking vessel P is not directly or indirectly air-cooled by the air from the air supply cylinder 14, and the above-described adverse effect does not occur. Further, the gap between the lid 13b and the bottom surface of the cooking vessel P is extremely small, and the flame or hot air of the gas burner 3 does not reach the pan bottom temperature sensor 10.
[0020]
By the way, when the temperature of the secondary air for combustion of the gas burner 3 is increased, the combustion speed is increased, the flame of the gas burner 3 is shortened, and the distance between the gas burner 3 and the bottom surface of the cooking vessel P may be shortened. As a result, thermal efficiency is improved. Here, the air used for air cooling of the heat shield cylinder 13 has been heated by heat exchange with the heat shield cylinder 13, and this air is used as secondary air for combustion to shorten the flame. Can be. Therefore, an air guide path 17 communicating with the outlet 13a at the lower end of the heat shield cylinder 13 is provided, and the air outlet 17a of the air from the air guide path 17 is arranged immediately below the flame hole 3b of the gas burner 3, so that the air is blocked. The air used for air cooling of the heating cylinder 13 can be efficiently used as secondary air for combustion.
[0021]
In the present embodiment, a space between the juice receiving tray 8 and the support member 9 forms the air guide path 17. In detail, the support member 9 is formed in a dish shape having a diameter larger than that of the juice receiving tray 8, and is provided in three places around the rising wall 9a on the outer periphery of the support member 9 as shown in FIG. The recess 9b is formed, and the upper edge of the rising wall 8a on the outer periphery of the juice receiving tray 8 receives the bent edge 8b on the upper surface of the recess 9b so that the juice receiving tray 8 is floated and supported by the support member 9, thereby supporting the juice receiving tray 8 and the support. An air gap that becomes the air guide path 17 is formed between the member 9. The outer diameter of the juice receiving tray 8 is slightly smaller than the circle in which the flame holes 3b of the gas burner 3 are arranged so that the juice receiving tray 8 can be removed upward. Therefore, the gap between the rising wall 8a on the outer periphery of the juice receiving tray 8 and the rising wall 9a on the outer periphery of the support member 9 becomes the outlet 17a located immediately below the flame hole 3b. Therefore, the air guide path 17 can be constituted only by the juice receiving tray 8 and the support member 9 including the outlet 17a, and the number of parts can be reduced and cost can be reduced. Further, the juice receiving tray 8 is air-cooled by the air flowing through the air guide passage 17, so that it is possible to prevent the spills falling on the juice receiving tray 8 from burning.
[0022]
By the way, the heat shield cylinder 13 is fixed to the pan bottom temperature sensor 10 at the lid 13b, and when the heat shield cylinder 13 is fixed to the juice receiving tray 8, the degree of freedom of movement of the pan bottom temperature sensor 10 by the spring 11 is hindered. Is done. Therefore, a bent edge 8d is formed at the upper end of the rising wall 8c on the inner periphery of the juice receiving tray 8, and the lower end of the heat shield cylinder 13 is slidably inserted through the inner periphery of the bent edge 8d, and the pan bottom temperature sensor 10 The outlet 13 a at the lower end of the heat shield cylinder 13 is communicated with the air guide path 17 in a state where the degree of freedom of the movement is secured. Further, an outer bending flange 13c is formed at the lower end of the heat shielding cylinder 13 so as to overlap the bending edge 8d, so that the outlet 13a can be prevented from being blocked by the invasion of boiling.
[0023]
If the pan bottom temperature sensor 10 is slidable with respect to the lid 13b, the heat shield cylinder 13 may be formed integrally with the juice receiving tray 8. Further, the air supply cylinder 14 may be fixed to the pan bottom temperature sensor 10, and the pan bottom temperature sensor 10 may be biased and supported upward through the pipe 12.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of an example of a gas stove according to the present invention.
FIG. 2 is a perspective view of a support member provided on the gas stove of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 ... Gas burner 3b ... Flame hole 6 ... Blower 8 ... Juice receiving tray 9 ... Support member 8a, 9a ... Rising wall 10 ... Pan bottom temperature sensor 13 ... Heat shield cylinder 13a ... Exit part at the lower end of heat shield cylinder 14 ... Air supply cylinder 17 ... Wind guide path 17a ... outlet

Claims (3)

A gas stove including a gas burner and a pan bottom temperature sensor in contact with a bottom surface of a cooking vessel heated by the gas burner, wherein a heat shield cylinder surrounding the pan bottom temperature sensor is provided, and air from a blower is supplied into the heat shield cylinder. In the case where the air supply cylinder is inserted, air is forced to flow from the upper end of the heat shield cylinder to the outlet of the lower end of the heat shield cylinder in the gap between the heat shield cylinder and the supply cylinder,
A gas stove with a pan bottom temperature sensor, wherein an air guide path communicating with an outlet portion at a lower end of a heat shield cylinder is provided, and an outlet of air from the air guide path is disposed immediately below a flame hole of a gas burner. The gas stove with a pan bottom temperature sensor according to claim 1, wherein the gas burner is constituted by an annular internal flame type burner, and a juice tray is arranged below a space surrounded by the burner,
A gas stove with a pan bottom temperature sensor, wherein a dish-shaped support member for floatingly supporting the juice tray is provided below the juice tray, and the air guide path is formed by a gap between the juice tray and the support member. The said support member is formed larger in diameter than the said juice tray, The said outlet is comprised by the space | gap between the rising wall of the outer periphery of a juice tray, and the rising wall of the outer periphery of a support member, The said outlet is characterized by the above-mentioned. A gas stove with a pot bottom temperature sensor as described.

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