JPS58124112A - Combustion device - Google Patents

Abstract

PURPOSE:To obtain stable electromotive force irrespective of changes in combustion rate by a method wherein a blue primary combustion flame is formed outside an outer flame cylinder and tip ends of the thermoelectric elements are positioned therein. CONSTITUTION:Gas is discharged between inner and outer flame cylinders 2 and 5 and fired. The gas is burned with air flowing from a number of small holes 3 and air port 17, forming the primary combustion flames 10 and 11 and secondary combustion flame 12. The tip end of an element 19 is heated by the primary combustion flame 11 to about 800 deg.C normally. Thus, the combined power of the plurality of thermelectric elements 18 drives a motor 30 to rotate an impeller 31. Air sucked by the impeller 31 is mixed with exhaust gas from a burner 1, becoming hot air which is distributed from a blowing-off port 26 of a body case 25 into a room to be heated. By this, the stable electromotive force can be obtained constantly irrespective of the changes in the combustion rate.

Description

[Detailed Description of the Invention] The present invention relates to a combustion device that uses oil or gas as a heat source to heat a thermoelectric power generating element that utilizes the Seebeck effect, and drives a blower or the like with the generated electromotive force. .

A thermoelectric power generation element is a cordless device in which P-type and N-type semiconductor rods are integrally joined at one end, and when heat is applied here, power can be obtained from both branched ends.

0-2B is about to be used in safety control devices, etc.

For example, one thermoelectric generating element has an electromotive force of 0.35
There are some with an electromotive force of about 03 mV, and by connecting a plurality of them in series, a large amount of DC power is generated to drive a blower, etc.

In addition, it is clear that the greater the temperature difference between the high temperature side of the heating section and the low temperature side of the cooling section, the greater the electromotive force of a thermoelectric power generating element, and the electromotive force increases if the low temperature side, which emits electricity, does not promote cooling. There are problems with durability due to deterioration of electrode terminals. Generally, the high temperature side is heated to 700-900℃, and the low temperature side is heated to 200℃.
It is necessary to keep the temperature below ℃.

FIG. 6 and FIG. 7 show the configuration of a combustion device using a conventional thermoelectric generating element. In the configuration shown in FIG. 6, a burner 32 is located inside the main body case 25, a heat exchanger 33 is connected to the burner 32, and a plurality of thermoelectric generating elements 18 arranged around the entire circumference are fixed to the heat exchanger 33. There is. An air outlet 27 is formed in the front of the main body case 26, and a blower motor 3° driven by a thermoelectric generator 18 is fixed to the rear. This is heated air by the heat exchanger 33 during steady state, and is radiated into the room through the air outlet 27.

In FIG. 7, a thermoelectric generator 18 is positioned above a burner 32, and the exhaust gas from the burner 32 is mixed with air supplied from an impeller 31 of a blower driven by the electromotive force of the thermoelectric generator 18 to generate warm air. This is then dissipated into the chamber through an air outlet 27 formed in the main body case 26.

In these conventional examples, the thermoelectric generating element 18 is positioned above the burner 32 and heated by the heat of the secondary flame or exhaust gas to generate an electromotive force. The combustion amount of the burner 32 needs to be adjusted to be strong or weak depending on the heating load in the room.
In the above configuration, the heating temperature of the weak combustion simultaneous thermoelectric power generation element 18 decreases, sufficient electromotive force cannot be obtained, and the rotational speed of the blower motor 3o decreases, resulting in a significant deterioration of the heating effect due to convection. becomes overheated.

In addition, in the configuration shown in FIG. 6, since the thermoelectric generating element 18 is fixed to the heat exchanger 33, the low temperature side of the thermoelectric generating element 18 is heated by conduction heat and radiant heat. Cool! In the configuration shown in FIG. 7, the low-temperature side of the thermoelectric generating element 18 and the heat sink are not cooled by forced airflow, and the exhaust gas heading toward the outlet 27 of the main body case 26 is located on the outlet 27 side. Since it partially contacts or flows close to the low-temperature side of the thermoelectric generating element 18, it is rather heated.

As mentioned above, since the low temperature side of the thermoelectric power generating element 18 is insufficiently cooled, the temperature difference between it and the high temperature side heated by the burner cannot be increased, so the power generation efficiency per single thermoelectric generating element is low and the electromotive force is small. The amount of air blown by the blower cannot be obtained sufficiently. Furthermore, it is necessary to increase the number of thermoelectric generating elements 18, and this increases the resistance to the flow of exhaust gas, which tends to cause incomplete combustion.

Furthermore, it was difficult to maintain the low temperature side below 200°C, and the insulator and electrode terminals deteriorated quickly, resulting in durability problems.The present invention attempts to solve these conventional problems in practical application. Even if you adjust the combustion amount of the burner to be strong or weak, the electromotive force of the thermoelectric generator hardly changes and a stable air flow is always obtained, and the power generation efficiency of the thermoelectric generator
The purpose is to increase durability.

To achieve this object, the present invention provides inner and outer flame tubes having a large number of small holes, and evaporates petroleum gas or gas such as propane from the lower part between the inner and outer flame tubes to be combusted and released. A primary combustion flame is formed on the outside of the flame cylinder, and the high-temperature side tip of the thermoelectric generator is positioned here to heat the flame.

As a result, the tip of the thermoelectric generator is always located in the primary flame even during strong and weak combustion, so a high electromotive force can be obtained, and the low temperature side of the thermoelectric generator is cooled by the draft air flow rising outside the burner, so it does not overheat. This improves power generation efficiency and durability.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Figure 1 is a side cross-sectional view of a combustion device used as an indoor open space heater, Figures 2 and 3 are side cross-sections of the burner, with Figure 2 showing strong combustion and Figure 3 showing weak combustion with 6 vanes. show. FIG. 4 is a top view showing the arrangement of a plurality of thermoelectric generating elements, and FIG. 5 is a side sectional view showing the configuration of the thermoelectric generating elements.

In the figure, 1 is a cylindrical burner whose structure is shown in FIGS. 2 and 3. Reference numeral 2 denotes a substantially cylindrical inner flame cylinder having a large number of small holes 3, and a substantially disc-shaped cap 4 is fixed to the upper part of this inner flame cylinder. 6 is a substantially cylindrical outer flame cylinder having a large number of small holes 6;
is held in a roughly cylindrical outer tube. 8 is a substantially cylindrical glass tube, 9
is a roughly ring-shaped lid. 10.11 indicates the primary combustion flame formed in the small hole 3 of the inner flame tube 2 and the outer part of the outer flame tube 5, and 12 indicates the secondary combustion flame at the burner outlet. Reference numeral 13 denotes a gas guide body having a plurality of ejection holes 14 at its upper part and an introduction pipe 16 connected at its lower part.

A support plate 1b is provided with a plurality of air ports 17.

18 is a thermoelectric generating element, the configuration of which is shown in FIG.

The element 19 utilizes the Seebeck effect, and is formed by joining a P-type material and an N-type material, such as iron silicide, on the heating part side, and has a high-temperature side to be heated and a low-temperature side to be cooled. An electromotive force is generated due to the temperature difference.

The low-temperature end of this element 19 is integrally fixed to holders 21 and 22 via an insulator 20 made of an insulating refractory cement or the like. Reference numeral 23 denotes a terminal plate for extracting electromotive force, which is insulated from the holder 21 and drawn out.

Cono holders 21 and 22 are fixed to the heat sink 24. A plurality of thermoelectric generating elements 18 are provided on the heat sink 24 in a semicircular shape, and the respective terminal plates 23 are connected in series.

Reference numeral 26 in FIG. 1 is a main body case, which forms an air outlet 26. 27 is a substrate, 28 is a partition plate, and 29 is a reflection plate.

3o is a DC motor, 31 is an impeller, and 32 is a support piece.

Next, the operation of an embodiment of the combustion apparatus of the present invention will be explained.

First, when gas is discharged between the inner and outer flame tubes 2 and 6 and ignited, a large number of small holes 3. Then, the combustion occurs with the air flowing in from the air port 17, and a secondary combustion flame 12 is formed at -flame combustion %1o,1. The tip of the element 19 is heated by this secondary combustion flame 11, and the temperature rises to about 800°C. As a result, the motor 3o is driven by the combined electromotive force of the plurality of elements 18, and the impeller 31 is rotated. The air sucked in by the impeller 30 mixes with the exhaust gas of the burner 1 and becomes warm air, which is radiated into the room through the Suita opening 26 of the main body case 26 to perform heating. In addition, the low temperature side of the thermoelectric generating element 18 is covered with an insulator 2 such as fireproof cement.
0. Heat is conducted to the heat dissipation plate 24 through the holders 21 and 22, and is maintained at about 0.0000.

In this way, during combustion, the blue primary combustion flame 11 is formed outside the outer flame tube 6, and the tip of the element 19 is positioned within this, so that even if the intensity of combustion is changed, the heating is always performed directly with the flame. Therefore, a stable electromotive force can be obtained. Furthermore, at the time of ignition start-up, a flame is formed sequentially from the lower part of the burner 1, but since the element 19 is located at the lower part of the burner 1, an increase in electromotive force can be obtained in a short time immediately after ignition. Further, the draft air flow rising along the burner 1 promotes cooling of the low temperature side of the element 19, and there is little risk of overheating.

9 pages ← Due to the cooling promotion effect, there is no overheating on the low temperature side.

This expands the temperature difference between the elements that generate heat and increases the power generation efficiency, resulting in a high electromotive force.If you use this to drive the blower, you can promote the heating effect and prevent the main body case from overheating. . Furthermore, the durability of the thermal power generating element is also improved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a combustion device according to an embodiment of the present invention, FIGS. 2 and 3 are side sectional views of a burner, FIG. 4 is a top view of a thermoelectric power generation element, and FIG. 6 is a side sectional view of a thermoelectric power generation element. Figures 6 and 7 are side sectional views of a conventional combustion device. 2...Inner flame tube, 3...Small hole, 6...-
...Outer flame tube, e...Small hole, 7...
Outer cylinder, 18... Thermoelectric power generation element, 19...
element. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 5

Claims (1)

[Claims] An outer flame tube with many small holes is provided on the outside of the inner flame tube with many small holes, and an outer flame tube is further installed on the outside of the outer flame tube, and the oil evaporates between the inner flame tube and the outer flame tube. A combustion device configured to deliver gas or gaseous fuel such as propane to burn it, and to heat it by positioning the tip of an element that generates heat in close proximity to the outer surface of the outer flame tube.