JPH05133510A - Heat generating device - Google Patents

Abstract

PURPOSE:To achieve good rising characteristics in a heat generating device for use in an iron, steamer, cooking device, coffee maker etc., wherein gaseous fuel or liquid fuel is burned and its heat of combustion is used as a heat source. CONSTITUTION:A heat generating device comprises a mixing part 14 of fuel gas and air, a combustion chamber 15 provided downstream of the mixing part 14 in which a catalyst layer 17 is closely attached to the inside wall thereof, and a casing having therein the combustion chamber 15. An igniter 20 is provided on an inside wall 15b of the combustion chamber facing a mixed gas inlet port 15a of the combustion chamber. By this construction, rising characteristics of combustion can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generating device used in irons, steamers, cookers, coffee makers, etc., which burns gaseous fuel or liquid fuel and uses the combustion heat as a heat source.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional heat generating device.
In FIG. 3, 1 is a liquefied gas cylinder such as propane and butane. A valve 3 is provided between the cylinder 1 and the nozzle 2 to control the flow rate of the fuel gas supplied from the cylinder 1. The fuel gas ejected from the nozzle 2 sucks the surrounding air by the attracting action of the gas flow, uniformly mixes it in the mixing chamber 4, and is supplied to the combustion chamber 5. The combustion chamber 5 is provided inside a heat generating portion 6 formed of a metal housing. A catalyst layer 7 is provided on the inner wall surface of the combustion chamber 5.

A thin platinum wire ignition heater 8 is heated by a dry battery (not shown), and the temperature of the catalyst layer 7 in the vicinity thereof is further raised. When the catalyst layer 7 is heated to the activation temperature, the valve 3 is opened and the fuel gas is supplied from the nozzle 2 to the mixing section 4. The air sucked by the jetting force of the fuel gas and the fuel gas are mixed in the mixing section 4, and the mixed gas is supplied to the combustion chamber 5.

In the combustion chamber 5, when a mixture of fuel and air is supplied to the surface of the catalyst layer 7 whose temperature has been raised to the activation temperature, the mixture burns on the surface of the catalyst layer 7 to start an exothermic reaction. The reaction surface gradually becomes hot, the reaction spreads throughout the combustion chamber 5, catalytic combustion occurs in the entire combustion chamber 5, and the combustion gas is discharged from the exhaust port 9.

A temperature detector 10 is provided in the heat generator 6. The temperature detecting unit 10 monitors the temperature of the heat generating unit 6,
By sending the signal to the valve and adjusting the opening of the valve, it has a function of adjusting the combustion amount. Therefore, the surface temperature of the heat generating portion 6 is kept constant, and the object to be heated can be heated at the optimum temperature.

[0006]

In the above heat generating device, a thin platinum wire used as an ignition heater is connected to a dry battery to heat the platinum wire to heat the catalyst layer. However, due to the use of dry batteries for power,
There is a limit to the amount of heat generated by the ignition heater, and only the catalyst layer in the immediate vicinity of the ignition heater can be heated. Then, when the fuel gas is supplied, combustion starts from the surface of the catalyst layer near the ignition heater to start an exothermic reaction. The reaction surface gradually becomes hot, the combustion reaction spreads, and catalytic combustion takes place in the entire combustion chamber.

For this reason, it takes a little time to perform stable combustion in the entire combustion chamber, which causes a problem that the rising characteristics are poor.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a heat generating device having excellent rising characteristics.

[0009]

A first aspect of the present invention includes a mixing portion for fuel gas and air, a combustion chamber having a catalyst layer adhered to an inner wall surface provided downstream of the mixing portion, and a combustion chamber inside. An igniter is provided on the wall surface of the combustion chamber facing the air-fuel mixture inlet of the combustion chamber, and an exhaust port of the combustion chamber that is positioned perpendicular to the flow direction of the air-fuel mixture is provided near the igniter.

A second aspect of the invention is a mixing section for fuel gas and air,
It is composed of a combustion chamber in which a catalyst layer is adhered to the inner wall surface provided downstream of the mixing section, and a housing having the combustion chamber inside, and a flow blocking section for blocking the flow of the air-fuel mixture is provided near the exhaust port in the combustion chamber. ,
An igniter is provided downstream of the flow shield.

[0011]

The fuel gas ejected from the nozzle sucks the surrounding air by the attracting action of the gas flow, uniformly mixes it in the mixing chamber, and is supplied to the combustion chamber. The mixed gas supplied to the combustion chamber flows in the combustion chamber, collides with the inner wall surface of the combustion chamber facing the mixture inlet, and is discharged from the exhaust port. At this time, the mixed gas colliding with the inner wall surface facing the air-fuel mixture inlet has a very slow mixed gas flow rate, and a region where the flow stagnates occurs near the inner wall surface facing the air-fuel mixture inlet. When the spark is generated by the igniter in accordance with this stagnation region, the mixed gas can be easily ignited.

Further, when the flow blocking portion is provided in the combustion chamber so as to block the flow of the mixed gas, a region where the flow of the mixed gas is stagnant is generated in the flow behind the flow blocking portion. When the spark is generated by the igniter in accordance with this stagnation region, the mixed gas can be easily ignited.

The flame generated here propagates upstream in the combustion chamber, and the propagated flame heats the catalyst layer in the combustion chamber. Therefore, since the catalyst layer is heated by utilizing the propagation of flame, the catalyst layer reaches the activation temperature in a short time, and the rising characteristics can be improved.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of an embodiment of the first invention. In FIG. 1, 11 is a liquefied gas cylinder such as propane and butane. Valve 1 between cylinder 11 and nozzle 12
3 is provided so that the flow rate of the fuel gas supplied from the cylinder 11 can be controlled. Nozzle 12
The fuel gas jetted out sucks the surrounding air by the attraction of the gas flow, mixes it uniformly in the mixing chamber 14, and the combustion chamber 1
5 is supplied. The combustion chamber 15 is provided inside a heat generating portion 16 formed of a metal housing. A catalyst layer 17 is provided on the inner wall surface of the combustion chamber 15.

Next, a specific operation principle will be described. The valve 13 is opened, and the fuel gas is mixed from the nozzle 12 with the mixing section 14.
Is supplied to. The air sucked by being attracted to the jetting force of the fuel gas and the fuel gas are mixed in the mixing section 14, and the mixed gas is supplied to the combustion chamber 15.

The mixed gas supplied from the combustion chamber inlet 15a flows in the combustion chamber 15, collides with the wall surface 15b of the combustion chamber facing the combustion chamber inlet 15a, and is discharged from the exhaust port 18. At this time, the mixed gas flow velocity is very low near the wall surface 15b of the combustion chamber where the mixed gas flowing in the combustion chamber collides,
An area with stagnant flow occurs. An igniter 20 is provided near the wall surface 15b of the combustion chamber so that the tip of the plug 19 is located in this stagnation area. When the igniter 20 supplies a high voltage from the high-voltage transformer 21, the spark is generated at the tip of the plug 19. A piezoelectric element may be used instead of the high voltage transformer.

A plug 1 whose igniter 20 produces a spark
The tip of 9 has an extremely good ignitability because the flow is stagnant, and as soon as the mixed gas reaches the tip of the plug 19,
The mixed gas is ignited by the spark. The flame formed by the plug 19 propagates in the combustion chamber 15 toward the upstream side.
When the high-temperature flame propagates upstream in the combustion chamber, it heats the catalyst layer 17 adhered to the wall surface of the combustion chamber. Since the igniter 20 is located most downstream in the combustion chamber 15, the propagating flame will heat all the catalyst layers 17. Therefore, the catalyst layer 17 is heated up to the activation temperature in a short time, the reaction spreads throughout the combustion chamber 15, catalytic combustion is performed, and the combustion gas is discharged from the exhaust port 18.

In this way, the catalyst layer 1 is utilized by utilizing the flame propagation.
Since the catalyst layer 17 is heated, the catalyst layer 17 reaches the activation temperature in a short time, and the rising characteristics can be improved.

Further, the heat generating section 16 is provided with a temperature detecting section 22. The temperature detecting section 22 has a function of monitoring the temperature of the heat generating section 16, sending a signal thereof to the valve 13, and adjusting the opening degree of the valve 13 to adjust the combustion amount. Therefore, the surface temperature of the heat generating portion 16 is kept constant, and the object to be heated can be heated at the optimum temperature.

FIG. 2 is a sectional view of an embodiment of the second invention. In FIG. 2, the combustion chamber 15 is composed of heat generating portions 23 and 24 and two portions, and is fixed by fixing bolts 25 and 26. Of the two fixing bolts 25 and 26, the fixing bolt 26 located downstream in the combustion chamber 15 is located near the exhaust port 18. Fixing bolt 25, 26
Has a function of fixing the combustion chambers 23 and 24, and the combustion chamber 1
It is designed so as to block the mixed gas flowing through the inside of 5. Therefore, a stagnation point exists in the wake of the fixing bolts 25 and 26. An igniter 28 is provided in the vicinity of the wall surface 15b of the combustion chamber so that the tip of the plug 27 is located at the stagnation point of the wake of the fixing bolt 26. When the ground side of the high voltage transformer 29 is connected to the heat generating portion 23, a spark will fly between the plug 27 and the fixing bolt 26.

Since the region where the sparks fly is the region where the flow behind the fixing bolt 26 is stagnant, it has a very good ignitability, and the mixed gas is ignited as soon as it reaches this region. The flame formed by the spark propagates in the combustion chamber 15 toward the upstream side. When the high-temperature flame propagates upstream in the combustion chamber, it heats the catalyst layer 17 adhered to the wall surface of the combustion chamber. Fixing bolt 26 is exhaust port 1
Since the igniter 27 is provided near the combustion chamber 15,
It will be located on the most downstream side. Therefore, the flame propagating in the combustion chamber 15 heats all the catalyst layers 17. Therefore, the catalyst layer 17 is heated up to the activation temperature in a short time, the reaction spreads throughout the combustion chamber 15, catalytic combustion is performed, and the combustion gas is discharged from the exhaust port 18.

In this way, by utilizing the propagation of flame, the catalyst layer 1
Since the catalyst layer 17 is heated, the catalyst layer 17 reaches the activation temperature in a short time, and the rising characteristics can be improved.

Further, the heat generating section 16 is provided with a temperature detecting section 22. The temperature detection unit 22 monitors the temperature of the heat generation unit 16, sends a signal to the valve 13 and adjusts the opening of the valve 13 to change the amount of gas supplied from the cylinder 11 and adjust the combustion amount. Have a function to do. Therefore, the surface temperature of the heat generating portion 16 is kept constant,
The object to be heated can be heated at the optimum temperature.

[0025]

As described above, according to the present invention, there is provided a mixing portion for fuel gas and air, a combustion chamber in which a catalyst layer is adhered to an inner wall surface provided downstream of the mixing portion, and a housing having the combustion chamber therein. In a heat generating device consisting of a By igniting the fuel gas by the igniter in the stagnation region generated in the combustion chamber by providing a furnace, the catalyst layer is heated by utilizing the propagation of the flame, so that the catalyst layer can reach an activation temperature in a short time. It is possible to improve the rising characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat generating device according to an embodiment of the first invention.

FIG. 2 is a sectional view of a heat generating device according to an embodiment of the second invention.

FIG. 3 is a sectional view of a heat generating device in a conventional example.

[Explanation of symbols]

 12 Nozzle 14 Mixing Section 15 Combustion Chamber 16 Exothermic Section 17 Catalyst 20 Igniter 26 Fixing Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyoko Itaya 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A fuel gas / air mixing section, a combustion chamber in which a catalyst layer is in close contact with an inner wall surface provided downstream of the mixing section, and a casing having the combustion chamber therein. An igniter is provided on a wall surface of the combustion chamber facing an air-fuel mixture inlet of the chamber, and an exhaust port of the combustion chamber is provided near the igniter in a direction perpendicular to a flow direction of the air-fuel mixture. 2. A fuel gas / air mixing section, a combustion chamber in which a catalyst layer is in close contact with an inner wall surface provided downstream of the mixing section, and a casing having the combustion chamber therein. A flow blocking part that blocks the flow of the air-fuel mixture is provided near the indoor exhaust port,
An exothermic device characterized in that an igniter is provided downstream of the flow blocking portion.