JP2000291951A - Catalytic combustor - Google Patents

Abstract

(57) Abstract: The present invention provides a catalytic combustor that can reliably detect a rise in temperature at the bottom of a cooking pot and cut off fuel gas to automatically cook rice. SOLUTION: A combustion unit 11, an operation unit 12, and a cooking pot 19 are provided. The combustion unit 11 has a heat conduction plate 24, a combustion catalyst 13, a combustion chamber 14, a nozzle 15, a mixing pipe 16, a flame extinguishing net 28,
The operation unit 12 includes an on-off valve 20, a fuel tank 21, and an ignition device 22. The on-off valve 20 is opened by an electromotive force of a thermocouple 32 provided in the combustion chamber 14. The thermostat 34 is provided below the center of the heat conducting plate 24, and the thermostat 34 opens and closes the electric circuit of the on-off valve 20 and the thermocouple 32. It is possible to obtain a catalytic combustor that can automatically cook rice by simply igniting to judge the completion of the process and shut off the fuel gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustor used for an apparatus for heating a gas by using a gas as a fuel in a catalytic combustion system.

[0002]

2. Description of the Related Art Conventionally, in a catalytic combustor of a heating apparatus to which catalytic combustion is applied, as shown in FIG. 9, a gas cylinder 3 is mounted on a fuel portion at the bottom of a case body 1, and the gas cylinder 3 is connected to a gas nozzle 4 through a valve. The gas nozzle 4 is connected to a mixing pipe 5 through which external air is introduced and mixed with gas.
Is guided to a combustion section provided above the fuel section, and an oxidizing catalyst 6 having gas permeability is arranged so as to surround the jet section at the upper end of the mixing pipe 5. An ignition heater 7 is provided in the jet path of the mixed gas. The heat exchange plate 8 is installed around the outer periphery of the oxidation catalyst 6, and the upper surfaces of the heat exchange plate 8 and the oxidation catalyst 6 are brought into contact with the bottom of the vessel 2 to form a heating unit, and a heating unit is formed. This is a catalytic combustor in which a space between the fuel section and the fuel section is partitioned by a reflector 9.

Next, the operation will be described. Fuel gas is jetted and supplied to the oxidizing catalyst 6 through the gas nozzle 4 and the mixing pipe 5, and catalytic combustion is started by the action of the oxidizing catalyst 6 based on the initial ignition, and the oxidizing catalyst 6, the heat exchange plate 8 Through which heat is efficiently exchanged with the water in the container 2 to heat or keep the temperature.

[0004]

In such a conventional catalytic combustor, there is no means for detecting the temperature of the object to be heated and stopping the fuel gas, so that cooking such as rice cooking cannot be performed automatically. It has what it has. Also, during combustion,
There is also a problem that there is no means for shutting off fuel gas when an unsafe state such as an abnormal temperature or when there is no cooking pot is provided.

Accordingly, the present invention provides a catalytic combustor which can detect the temperature rise at the bottom of a cooking pot, judge the completion of cooking, cut off the fuel gas, and automatically cook rice. This is one of the issues. A second object is to provide a catalytic combustor that can accurately detect the temperature at the bottom of a cooking pot and reliably cook rice. A third object is to provide a catalytic combustor that can accurately detect the temperature even when the shape of the bottom of the cooking pot changes and can reliably cook rice. A fourth object of the present invention is to provide a catalytic combustor that can improve the temperature detection performance and perform more reliable rice cooking. A fifth object of the present invention is to provide a catalytic combustor capable of performing efficient and reliable rice cooking by further improving the temperature detection performance while increasing the thermal efficiency. A sixth object of the present invention is to provide a catalytic combustor which is provided with a cooking pan temperature detecting means which also serves to detect the presence or absence of a cooking pan, and which has improved safety, operability and economy at the same time.

[0006]

In order to achieve the above object, the present invention comprises a combustion section, an operation section and a cooking pot, wherein the combustion section has a heat conducting plate, a combustion catalyst, a combustion chamber, a nozzle, a mixing pipe, An ignition plug, a flame-extinguishing net communicating with the outside of the combustion chamber, and a thermocouple; an operation unit including an on-off valve, a fuel tank, and an ignition device, wherein the on-off valve is opened by an electromotive force of the thermocouple provided in the combustion chamber. And a thermostat is provided below the center of the heat conductive plate, and a circuit of the on-off valve and the thermocouple is opened and closed by the thermostat to form a catalytic combustor.

According to the present invention, the completion of cooking is judged by detecting a rise in the temperature of the bottom of the cooking pot, and the fuel gas is shut off. , And a thermostat in the center of the heat conductive plate,
The thermostat is housed in a holding case having a contact plate in contact with the bottom surface of the cooking pot and is shielded from heat, so that the temperature at the bottom of the cooking pot can be accurately detected, and rice can be cooked reliably.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
The combustion unit includes a combustion unit, an operation unit, and a cooking pot.The combustion unit includes a heat conducting plate, a combustion catalyst, a combustion chamber, a nozzle, a mixing pipe, a flame-extinguishing net communicating outside the combustion chamber, a thermocouple, an air suction port, and a spark plug. , The operating unit is equipped with an on-off valve, fuel tank, ignition device,
The on-off valve is kept open by the electromotive force of the thermocouple provided in the combustion chamber, and a thermostat is provided below the center of the heat conductive plate, and the thermostat is connected to the on-off valve by the thermostat. It is a catalytic combustor that opens and closes the circuit.

[0009] Then, the completion of cooking is determined by detecting a rise in the temperature of the bottom of the cooking pot, and the fuel gas is shut off.

The second aspect of the present invention is the first aspect.
The thermostat is housed in a holding case that has a contact plate that contacts the bottom of the cooking pot, and the thermostat is stored in the holding case and heat is shielded, so the temperature at the bottom of the cooking pot is accurately detected. And cook rice reliably.

The invention according to claim 3 of the present invention is the invention according to claim 2
A heat shield case is provided below the center of the heat conductive plate in the configuration of the above, and the holding case containing the thermostat inside is inserted with a compression spring between the heat shield case and the holding case, so that it can slide up and down inside the heat shield case. The temperature detection performance is further improved, and more reliable rice cooking can be performed.

The invention according to claim 4 of the present invention is the invention according to claim 3.
The heat shield case is installed at the bottom of the heat shield case, and the heat shield case is attached to the heat shield plate with relatively low temperature, so the heat shield effect is further enhanced and the temperature detection performance is further improved In addition, more reliable rice cooking can be performed.

The invention according to claim 5 of the present invention is the invention according to claim 3.
Alternatively, the mixed gas flow path on the downstream side of the mixing pipe is arranged on the outer periphery of the heat shield case in the configuration of 4, and the circuit of the on-off valve and the thermocouple is opened and closed by the thermostat. Because it is located near the pan and the low-temperature mixed gas is configured to flow around the outer periphery of the heat shield case, the influence of external heat is reduced, and the thermal efficiency is improved and the temperature detection performance is further improved. It is possible to cook rice efficiently and reliably.

[0014] The invention according to claim 6 of the present invention is directed to claim 5.
In this configuration, an open / close switch is connected in series to the open / close valve and thermocouple circuit, an operating piece is provided in the holding case, and the open / close switch is opened and closed by the operating piece, and the cooking pan temperature detection functioning also as a cooking pan detecting means Since the means is provided, the operability and the economical efficiency as well as the safety are improved at a low cost.

[0015]

Embodiment 1 Embodiment 1 of the present invention will be described below with reference to FIGS. In the figure, reference numeral 11 denotes a combustion unit, which comprises a combustion catalyst 13, a combustion chamber 14, a nozzle 15, a mixing pipe 16, a spark plug 17, and a flame-extinguishing net 28 communicating with the outside of the combustion chamber 14. 19 is a cooking pot. 12
An operation unit is constituted by an on-off valve 20, a fuel tank 21, and an ignition device 22 using a piezoelectric element. The mixing tube 16
Utilizing the kinetic energy of the gas ejected from the nozzle 15, the air is sucked and mixed with the air. Reference numeral 24 denotes a heat conductive plate which covers the upper portion of the combustion catalyst 13, and is made of aluminum having excellent heat conductive characteristics. Combustion catalyst 1
Reference numeral 3 denotes, for example, a honeycomb-shaped ceramic body carrying a platinum-based oxidation catalyst. The cooking pot 19 is placed on the heat conducting plate 24. 26 is a rectifying chamber 2 for mixing gas.
7 is an introduction pipe leading to 7. The internal pressure of the rectification chamber 27 becomes uniform, and the mixed gas is supplied to the combustion catalyst 13 uniformly. 2
Reference numeral 8 denotes a flame extinguishing net, in which the flame generated in the combustion chamber 14
4 and only the combustion exhaust gas is discharged out of the combustion chamber 14 to heat the outer peripheral surface of the cooking pot 19. As an example of the flame-extinguishing net 28, a foamed ceramic, a wire mesh with a fine mesh, or the like may be used. 29
Is a knob for operating the on-off valve 20, and is connected to the operating piece 30 of the ignition device 22. 31 is an outer frame that covers the combustion unit 11. Reference numeral 32 denotes a thermocouple, and the electromotive force is transmitted to the on-off valve 20 via a lead wire 33. Reference numeral 34 denotes a thermostat provided at the center of the heat conductive plate 24,
5, contact 36, case 37, contact 38, contact rod 3
9. The contact 38 is connected to one of the lead wires 33 so as to open and close the circuit of the thermocouple 32 and the on-off valve 20. The inversion temperature of the inversion bimetal 35 is about 120.
It is set to ° C. and operates at the end of rice cooking. When the knob 29 is pressed to open the on-off valve 20, gas is ejected from the nozzle 15. The ejected gas flows through the mixing tube 16 and is completely mixed with the sucked air. The mixed gas enters the rectification chamber 27 through the introduction pipe 26 and is uniformly supplied to the combustion catalyst 13. At the same time as the knob 29 is pressed, the ignition device 22 is also pressed and a spark is generated from the ignition plug 17, and a flame is formed in the combustion chamber 14 above the combustion catalyst 13. At this time, the thermocouple 32
Is heated to generate an electromotive force, the magnet in the on-off valve 20 is excited, and the on-off valve 20 is maintained in an open state, and the combustion is continued. When the temperature of the combustion catalyst 13 rises to 200 ° C. or higher, which is the temperature at which catalytic combustion is possible, catalytic combustion starts, and the flame extinguishes soon. However, the thermocouple 32 is continuously heated by the combustion heat of the catalytic combustion, and the on-off valve 20 is kept open. When the temperature of the thermocouple 32 does not rise due to misfiring or fire extinguishing, the magnet in the on-off valve 20 is not excited, the on-off valve 20 is closed, and the fuel is shut off. Heat conduction plate 24
The cooking pot 19 placed on the cooking pot 19 is heated, the rice cooking ends, and the temperature at the bottom of the cooking pot 19 rises rapidly. When the temperature at the bottom of the cooking pot 19 reaches 120 ° C., the inverted bimetal 35 is inverted, the contact rod 39 opens the contact 38 and closes the on-off valve 20. As described above, since the completion of cooking is determined by detecting the temperature rise at the bottom of the cooking pot 19 and the fuel gas is shut off, the rice can be automatically cooked only by ignition.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIG. The same reference numerals as those in FIG. 1 described in the first embodiment denote the same functions, and a description thereof will be omitted, and different parts will be described. When the temperature at the bottom of the cooking pot 19 reaches 120 ° C., the inverted bimetal 35 is inverted, and the contact rod 39 is moved to the contact 3.
8 is opened and the on-off valve 20 is closed. At this time, due to the influence of the radiant heat from the combustion chamber 14 and the conductive heat from the heat conducting plate 24, the temperature rise of the thermostat 34 becomes faster than the rise of the pot bottom temperature of the cooking pot 19, resulting in malfunction. However, the contact plate 41 guides the heat from the heat conducting plate 24 to the holding case 40, and furthermore, the holding case 40 cuts off the radiant heat from the combustion chamber 14, thereby reducing the influence of external heat and accurately setting the thermostat 34. It is configured to work.
As described above, the temperature rise at the bottom of the cooking pot 19 can be accurately detected, so that rice can be cooked reliably.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIG. Since the same reference numerals as those in the drawings described in the first and second embodiments have the same functions, the description thereof will be omitted, and only different portions will be described. Reference numeral 40 denotes a holding case having a contact plate 41, in which the thermostat 34 is housed. 42
Is a heat shield case provided on an outer peripheral edge of the heat conductive plate 24, and a holding case 40 is mounted inside so as to be slidable up and down. Reference numeral 43 denotes a compression spring inserted between the heat shield case 42 and the holding case 40, and urges the contact plate 41 so as to be in close contact with the bottom of the cooking pot 19. The influence of the radiant heat from the combustion chamber 14 and the conductive heat from the heat conductive plate 24 causes the heat shield case 42 to guide the heat from the heat conductive plate 24 to the side wall of the heat shield case 42.
Further, it is configured such that the side wall of the heat shield case 42 blocks radiant heat from the combustion chamber 14, and the heat shield effect of the holding case 40 further reduces and more accurately operates the thermostat 34. In addition, malfunction due to poor contact between the pot bottom and the contact plate 41 is caused by the compression spring 43
Is attached to the bottom of the pot to reduce it. As described above, the temperature rise at the bottom of the cooking pot 19 can be more accurately detected, so that rice can be cooked more reliably.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to FIG. Since the same reference numerals as those in the drawings described in the first to third embodiments have the same functions, the description thereof will be omitted, and only different portions will be described. Radiation heat from the combustion chamber 14 and the heat conduction plate 24
The effect of the heat conducted from the heat shield case 42 is eliminated by attaching the heat shield case 42 to the heat shield plate 44, thereby eliminating the heat conduction from the heat conductive plate 24 and further radiating heat from the combustion chamber 14.
Are shut off and minimized by the heat shielding effect of the holding case 40, so that the thermostat 34 operates more accurately. Also, the pot bottom and the contact plate 41
The malfunction due to the poor contact is reduced by bringing the contact plate 41 into close contact with the pot bottom by the compression spring 43. As described above, the temperature rise at the bottom of the cooking pot 19 can be more accurately detected, so that rice can be cooked more reliably.

(Embodiment 5) A fifth embodiment of the present invention will be described with reference to FIG. The same reference numerals as those in FIG. 1 described in the first embodiment denote the same functions, and a description thereof will be omitted, and only different parts will be described. Reference numeral 45 denotes a mixed gas flow path for guiding the mixed gas to the rectification chamber 27, and is provided so as to cover the outer periphery of the heat shield case 42. The internal pressure of the rectification chamber 27 becomes uniform, and the combustion catalyst 1
3 is supplied with the mixed gas uniformly. Reference numeral 28 denotes a flame extinguishing net that discharges exhaust gas out of the combustion chamber 14 so that the flame generated in the combustion chamber 14 does not go out of the combustion chamber 14. Combustion chamber 14
The effect of radiant heat from the heat conduction heat from the heat conduction plate 24 disappears because the low-temperature mixed gas flows around the outer periphery of the heat shield case 42, and the thermostat 34 is accurately measured.
Will work. In addition, the heating surface can be heated more efficiently because the heating surface is close to the bottom of the pot. In this way, it is possible to reliably and efficiently cook rice.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described with reference to FIGS. 7 and 8 because the same reference numerals as those in FIGS. Only the part will be described. An operation piece 46 is provided at the bottom of the holding case 40. Reference numeral 47 denotes an open / close switch provided in series with the circuit of the open / close valve 20 and the thermocouple 32, and is located so as to be opened and closed by the vertical movement of the operation piece 46. 42 is a heat shield plate 4
A holding case 40 is slidably mounted inside a heat shield case provided at the center of the fourth case 4. 43 is a compression spring inserted between the heat shield case 42 and the holding case 40,
The contact plate 41 is urged so as to be in close contact with the pot bottom of the cooking pot 19. When the cooking pot 19 is present, the holding case 40 moves downward, and the operation piece 46 is accordingly moved by the open / close switch 4.
Close 7. When there is no cooking pot 19, the holding case 40
Moves upward, the operating piece 46 also moves, and the open / close switch 47 is opened. If the open / close switch 47 is open, the combustion cannot be maintained because the open / close valve 20 cannot be kept open even when combustion is started. Since the cooking pot temperature detecting means also serving as the cooking pot detecting means is provided, operability and safety can be improved.

[0021]

According to the first aspect of the present invention, since the fuel gas is cut off by detecting the temperature rise at the bottom of the cooking pot and judging the completion of the cooking and shutting off the fuel gas, only the ignition is performed, and the rest is automatically performed. Can cook rice.

According to the second aspect of the present invention, the influence of external heat is reduced and the thermostat is operated accurately so that the temperature rise at the bottom of the cooking pot can be accurately detected. Can cook rice.

According to the third aspect of the invention, the effects of radiant heat from the combustion chamber and conduction heat from the heat conducting plate are reduced by the heat shielding effect of the heat shielding case and the holding case. Malfunction due to poor contact is reduced by compressing the contact plate so that it is in close contact with the bottom of the pot.
Configure the thermostat to work more accurately,
Since the temperature rise at the bottom of the cooking pot can be detected more accurately, rice can be cooked more reliably.

According to the fourth aspect of the present invention, the effect of external heat is reduced to a minimum by attaching the heat shield case to the heat shield plate and the heat shield effect of the holding case, and the thermostat operates more accurately. And the temperature rise at the bottom of the cooking pot can be more accurately detected, so that rice can be cooked more reliably.

According to the present invention, the influence of external heat is reduced by flowing a low-temperature mixed gas to the outer periphery of the heat shield case, so that the thermostat operates accurately and heat is generated. Since the surface can be brought close to the bottom of the pot and can be efficiently heated, rice can be reliably and efficiently cooked.

According to the invention of claim 6, since the cooking pot temperature detecting means also serving as the cooking pot detecting means is provided, the operability is improved.
It is both economical and safe.

[Brief description of the drawings]

FIG. 1 is a sectional view of a catalytic combustor showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the catalytic combustor when a thermocouple circuit is opened.

FIG. 3 is a sectional view of a catalytic combustor showing a second embodiment of the present invention.

FIG. 4 is a sectional view of a catalytic combustor according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a catalytic combustor showing a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a catalytic combustor according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a catalytic combustor showing a sixth embodiment of the present invention.

FIG. 8 is a sectional view of a main part of the catalytic combustor.

FIG. 9 is a sectional view of a conventional catalytic combustor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Combustion part 12 Operation part 13 Combustion catalyst 14 Combustion chamber 15 Nozzle 16 Mixing pipe 17 Spark plug 18 Air suction port 19 Cooking pan 20 Open / close valve 21 Fuel tank 22 Ignition device 24 Heat conduction plate 32 Thermocouple 34 Thermostat 40 Holding case 41 Contact plate 42 Heat shield case 43 Compression spring 44 Heat shield plate 45 Mixed gas flow path 46 Operation piece 47 Open / close switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Miki Hono 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3K003 EA03 FA01 FB05 GA03 3K017 BA01 BC10 BD02 3K065 TA09 TA19 TC00 TD05 TN01 4B055 AA04 BA22 BA36 DA02 DB08 GB07 GC18

Claims (6)

[Claims] 1. A combustion unit, an operation unit and a cooking pot, wherein the combustion unit includes a heat conducting plate, a catalyst for combustion, a combustion chamber, a nozzle, a mixing pipe, a spark plug, a flame-extinguishing net communicating outside the combustion chamber, and a thermocouple. Equipped with an on-off valve, fuel tank, ignition device,
The on-off valve is kept open by the electromotive force of the thermocouple provided in the combustion chamber, and a thermostat is provided below the center of the heat conduction plate, and the thermostat is connected to the on-off valve by the thermostat. A catalytic burner that opens and closes the circuit. 2. The catalytic combustor according to claim 1, wherein the thermostat is housed in a holding case having a contact plate in contact with a bottom surface of the cooking pot. 3. A heat shield case is provided below the center of the heat conductive plate,
The catalytic combustor according to claim 2, wherein a compression spring is inserted between the heat shield case and the holding case, and the holding case containing the thermostat therein is slidably mounted in the heat shield case up and down. 4. The catalytic combustor according to claim 3, wherein a heat shield plate is provided at the bottom of the heat shield case. 5. The catalytic combustor according to claim 3, wherein a mixed gas flow path downstream of the mixing pipe is provided on an outer periphery of the heat shield case. 6. The catalytic combustor according to claim 5, wherein an open / close switch is connected in series to a circuit of the open / close valve and the thermocouple, and an operating piece is connected to the holding case, and the open / close switch is opened and closed by the operating piece.