JPS608607A - Combustion device - Google Patents

Abstract

PURPOSE:To perform stable evaporation without generating tar, to save a power, and to improve durability of an evaporating body, by a method wherein an exhaust gas passage is formed below the base of the evaporating body, the outlet of exhaust gas is formed in a position located opposite to the base wall, and a radiating body is mounted therein. CONSTITUTION:Combustion exhaust gas flows through a space between a combustion body 28 and an outer plate 29 to a space between the side wall of an evaporating body 15 and an outer cylinder 19, and is exhausted through a radiation body 31, installed in an outlet part 20, after passing through a passage 21 installed below the base wall of the evaporating body 15. During the flow of combustion exhaust gas, the enough heat is imparted thereto by the side wall and the base part of the evaporating body 15, and the fuel can be continuously evaporated only through feedback of a combustion heat even if electrical connection to an electric heater 16 is disconnected. Especially, the base part of the evaporating body 15 is concentratedly by exhaust gas and the radiation heat from the radiating body 31 to maintain a high temperature, resulting in the possibiity to perform stable evaporation and prevent generation of tar.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device mainly used in household heating equipment and the like.

Conventional configuration and its problems A typical example of a conventional combustion device is shown in FIG.

In FIG. 1, 1 is a vaporized body, which is preheated by an electric heater 2. 3 is a mixing plate, 4 is a flame hole body with a large number of slits formed therein, and 5 is a flame in premix combustion. 6 is the outer cylinder,
7 is a primary air blower pipe, 8 is an i4 pipe, and 9 is a fuel pump. 10 is a secondary air blower pipe, and 11 is a blower. 1
Reference numeral 2 denotes a cylinder that guides the exhaust gas to the upper part, and a purification catalyst 13 having a large number of small holes 14 is installed at the upper end of the cylinder.

In this type of combustion device, the fuel discharged from the pipe 8 hits the side wall of the vaporizer 1 facing the pipe 8, flows to the bottom, and is vaporized there.

Also, during steady combustion, the vaporized body 1 is heated by heat conduction from the flame hole body 4 to the vaporized body 1 and by applying part of the flame 5 to the upper end of the vaporized body 1, and the electricity supply to the electric heater 2 is minimized. It is said that

However, as can be seen from FIG. 1, it is necessary to receive heat from the flame 5 and the flame hole body 4 at the tip of the vaporizer 1, and to conduct this heat to the bottom via the side wall.

The tip and bottom of the vaporized body 1 are affected by the time delay in heat conduction from the top to the bottom of the vaporized body 1, the cooling of the bottom of the vaporized body 1 by the liquid fuel and primary air, and the heat radiation from the outer surface of the vaporized body 1. There is no choice but to create a large temperature difference. These factors tend to cause deformation and material deterioration due to non-uniform expansion. Furthermore, although the bottom part vaporizes most of the liquid fuel, the temperature of the vaporized body 1 is the lowest, a stable vaporization state cannot be obtained, and a large amount of tar is generated. Furthermore, in order to maintain the temperature at the bottom of the vaporized body 1 at a constant temperature, it is necessary to control the supply of electricity to the electric heater 2, which consumes a large amount of power and poses a problem in economical efficiency during use.

OBJECT OF THE INVENTION The present invention aims to solve these conventional problems, and aims to achieve stable vaporization without generating tar by effectively heating the bottom wall of the vaporizer, which contributes most to the vaporization of liquid fuel, with combustion exhaust gas. The purpose is to save power and maintain a uniform temperature throughout the vaporized body to improve durability.

Structure of the Invention In order to achieve this object, the present invention brings the exhaust gas into contact with the outer surface of the bottom wall of the vaporizer, and forms an exhaust gas discharge port opposite to the bottom wall, and heats the exhaust gas here. A radiator is installed. As a result, the heat necessary for vaporization can be fed back to the bottom by heat exchange from the combustion exhaust gas and radiation conduction from the radiator.

Furthermore, the entire vaporized body can be maintained at a uniform temperature optimal for vaporization, and exhaust gas can also be purified by supporting a platinum catalyst or the like on the radiator.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will now be described with reference to FIG.

Reference numeral 15 denotes a cylindrical vaporizer with a bottom, which is preheated by an electric heater 16 . 17 is the bottom wall of the vaporizer 15, and 18 is a mixing plate.

Reference numeral 19 denotes an outer cylinder, and a discharge port 20 for exhaust gas is provided at the lower part. 21 indicates an exhaust gas passage.

22 is a blower pipe, and 23 is a blower. 24 is a pipe, 2
5 is a pump for supplying liquid fuel. A combustion body 28 made of a wire mesh or the like is located outside of a flow regulating body 26 having a large number of small holes 27, and one end of the combustion body 28 is connected to the upper end of the vaporization body 15. 9 is an outer plate made of heat-resistant glass or the like and placed on the outer cylinder 19. 30 is camping. 31 is a radiator having a ventilation hole 32, and 33 is a holding fitting.

The operation in the above configuration will be explained.

First, the electric heater 16 is energized and the vaporized body 15 is heated to about 300°.
Preheat to C. Next, when the blower 23 and pump 25 are energized, combustion air and fuel necessary for complete combustion are supplied into the vaporizer 15, and the fuel is vaporized to become a premixed gas with air.

This premixed gas enters the rectifier 26 from the center of the mixing plate 18, passes through the small holes 27, and is ejected onto the outer surface of the combustion body 28.
It is ignited here and burns. The combustion flame is formed thinly on the outer surface of the combustion body 28, and combustion is completed here and the combustion flame 28 is formed thinly on the outer surface of the combustion body 28.
8 itself becomes red-hot to about 850° C. and radiates radiant heat through the outer plate 29. On the other hand, the combustion exhaust gas is generated between the combustion body 28 and the outer plate 2.
9 and proceeds between the side wall of the vaporized body 15 and the outer cylinder 19,
Furthermore, a passage 21 provided below the bottom wall of the vaporizer 15
The liquid is then discharged through a radiator 31 installed at the discharge port 20 portion.

During the flow of the combustion exhaust gas, sufficient heat is received at the side walls and bottom of the vaporizer 15, and even if the electric heater 16 is turned off, the fuel can be continuously vaporized only by feedback of the combustion heat. In particular, the bottom of the vaporizer 15 is intensively heated by the exhaust gas and the radiant heat from the radiator 31 and can maintain a high temperature, so that stable vaporization and tar generation can be suppressed.

Effects of the Invention The present invention forms an exhaust gas passage below the bottom of the vaporizer,
Further, by providing an exhaust gas discharge port at a position facing the bottom wall and installing a radiator there, the following effects can be obtained.

(1) The bottom wall of the vaporizer, which vaporizes most of the fuel, is heated intensively by combustion exhaust gas and radiant heat from the radiant, which becomes red-hot, to constantly maintain the high temperature state optimal for vaporization. The speed is increased, a stable vaporization state without vaporization pulsation is obtained, and the generation of tar is greatly suppressed.

(2) During steady combustion, the bottom wall of the vaporized body is heated intensively, and heat is received from almost all of the outer surface, so the vaporized body itself can be maintained at a high and uniform temperature. Therefore, there is no local overheating (no deformation due to uneven thermal expansion) and improved durability.

(3) Conventionally, it took time for heat to be conducted from the heat receiving part to the wall surface where the fuel is vaporized, but in the present invention, the exhaust gas reaches the vaporized chamber immediately after combustion starts, and heats it. The heater can also be energized immediately. ff, power saving and stable vaporization can be achieved.

(4) When the radiator supports a catalyst such as platinum, Co, HC, etc. in the exhaust gas can be purified, resulting in a cleaner combustion device. In particular, after extinguishing the fire, the radiant body is heated by the radiant heat from the bottom wall of the vaporized body, making it possible to extend the purification time.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a conventional combustion device, and FIG. 2 is a side sectional view of a combustion device according to an embodiment of the present invention. 15 vaporized body, 17 bottom wall, 21 passage, 31...
radiant. −

Claims (2)

[Claims] (1) A combustion section is connected to a bottomed cylindrical vaporizer that is preheated by an electric heater, and an exhaust gas passage is formed in the lower part of the bottom wall of the vaporizer, and is opposite to the bottom wall of the vaporizer under the bottom wall. A combustion device equipped with a radiator. (2) The combustion device according to claim 1, wherein the radiator supports an exhaust gas purifying catalyst such as platinum.