JPS5820841Y2 - Nenshiyousouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a combustion device suitable for use, for example, in a hot air heater.

Conventionally, in a combustion device in which the heat exchanger adjacent to the combustion chamber is composed of a group of small-diameter heat exchange pipes, the combustion exhaust gas usually has a high temperature gas flow in the central part.
A large amount of high-temperature exhaust gas flows in the center of the combustion chamber and in the center of the heat exchange pipe group, resulting in poor thermal efficiency and in the case of only some pipes in the heat exchange pipe group. Large thermal stress occurs intensively, shortening its lifespan.

Additionally, only some of the heat exchange pipes become red hot, and these can become dangerous as they develop holes and cracks after long-term use.

The present invention has been made with the aim of solving the above-mentioned conventional problems.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a main gas nozzle for fuel injection, 2 is a gas burner, and an intake chamber 3 is formed on the outer periphery of the lower part of the burner.
The intake pipe 4 is connected to the negative side, and the inlet of the bypass pipe 5 for introducing excess air is connected to the other side.

A combustion chamber 6 is provided adjacent to this intake chamber 3, and both chambers 3 and 6 are configured to supply the minimum amount of combustion secondary air (with an excess air ratio of 1).
．． Small diameter hole 7 that limits the amount to about 2 to 1.4
It is partitioned by a partition plate 8 having a.

Reference numeral 9 denotes a flame dispersion body provided close to the flame port 2a of the burner 2, which is a disc having flame holes 10 on its outer periphery, and connects the outer periphery of the disk to the inner surface of the peripheral wall 6a of the combustion chamber 6. The flame of the burner 2 can be dispersed to the outer peripheral side of the combustion chamber 6 (in the radial direction of the dispersion body).

Reference numeral 11 denotes a heat exchanger connected to the exhaust side of the combustion chamber 6, and the combustion exhaust gas passing through the small-diameter heat exchange pipe 12 circulates outside the pipe 12. It is for heating the fluid.

13 is the inlet 12a of the heat exchange pipe 12...
・・・・・・A gas distribution body installed in the front combustion chamber 6,
This is constructed by fixing a disc having a diameter slightly smaller than the inner diameter of the combustion chamber 6 to the heat exchanger 11 via an individual fixture 14 at a position appropriately spaced from the pipe population 12a. The exhaust gas in the combustion chamber 6 can be introduced into the heat exchanger 11 while being distributed almost uniformly over the entire surface of the inlet.

15 is an exhaust chamber provided on the outlet side of the heat exchanger 11;
The outlet of the bypass pipe 5 is connected to one side, and the exhaust pipe 16 is connected to the other side, and the low temperature air is mixed with the low temperature air coming in from the bypass pipe 5 in the exhaust chamber 15 to lower the temperature. The exhaust gas can be discharged to the outside from the exhaust pipe 16.

Note that a blower (not shown) is provided near the intake chamber 3 or the exhaust chamber 15 in order to forcibly perform the above-mentioned intake and exhaust.

Reference numeral 17 denotes an ignition device, which is composed of a main body case 18, a gas nozzle 19 to the pilot 1, a discharge plug 20, and a thermocouple 21, and is bored in the peripheral wall 6a of the combustion chamber slightly on the intake side from the dispersion element 9. It is attached to holes 22 and 23.

The thermocouple 21 is activated when heated by the pilot gas flame to open the main gas supply valve.

Next, the action will be explained.

First, combustion air flows into the intake chamber 3 from the intake cylinder 4, and in this chamber, the primary air that is inside the burner 2, the secondary air that enters the combustion chamber 6 through the hole 7 of the partition plate 8, and the bypass This is separated into excess air that is not involved in combustion and enters tube 5.

Also, in the ignition device 17, a pilot gas nozzle 19
The mixed gas of pilot gas and air that comes out forms a pilot flame due to the discharge of the discharge plug 20, which heats the thermocouple 21. As a result, fuel gas is ejected from the main gas nozzle 1, and this gas and primary air are combined. The mixed gas exits from the flame port 2a of the gas burner 2, comes into contact with the dispersion element 9, and spreads toward its outer circumference, that is, toward the pilot flame, igniting the flame and starting combustion.

In this way, the mixed gas hits the dispersion element 9 and spreads toward its outer periphery, so that a large flame whose tip protrudes from the flame hole 10 of the dispersion element 9 is formed on the outer periphery of the combustion chamber 6.

In this case, the central part of the fuel gas from the flame port 2a of the burner 2 will collide with the dispersion element 9, or the gas will instead be dispersed around the surrounding area, and the mixture with the secondary air will be very good, resulting in combustion. promotes combustion and does not cause incomplete combustion.

In this way, the amount of secondary air is restricted, and the high-temperature combustion exhaust gas flows around the outer periphery of the combustion chamber 6 near the dispersion body 9, heating the outside fluid via the peripheral wall 6a, and gradually increasing the temperature of the combustion chamber 6. gather in the center.

In other words, the exhaust gas flowing in the outer peripheral portion is lower in temperature than the exhaust gas flowing in the center due to heat radiation, and also has a lower speed than the exhaust gas flowing in the center due to resistance with the peripheral wall of the combustion chamber 6 due to the viscosity of the exhaust gas itself. They gather toward the hot and fast exhaust gas flowing through the center.

Then, this exhaust gas hits the gas distribution body 13, spreads toward its outer periphery, passes between its outer periphery 13a and the inner surface of the combustion chamber peripheral wall 6a, and most of the exhaust gas is distributed to the gas distribution body 13, which spreads toward its outer periphery and passes between its outer periphery 13a and the inner surface of the combustion chamber peripheral wall 6a. When the remaining exhaust gas enters the heat exchange pipes 12..., the remaining exhaust gas returns to the center and enters the small number of heat exchange pipes 12....

That is, the exhaust gas is transferred to the heat exchanger 11 by the action of the gas distributor 13.
It is introduced in a state where it is almost evenly distributed over the entire surface of the entrance.

In the conventional combustion chamber 6, the exhaust gas is concentrated in the center, and it is concentrated in S (<t) of the t heat exchange pipes 12 in the center, so the speed of the exhaust gas is high. As mentioned above, the gas distribution body 13 is provided to connect all the heat exchange pipes 1.
If the exhaust gas is dispersed into two parts, the diffusion area of the exhaust gas will be substantially expanded, and even if the amount of exhaust gas is the same, the speed will be slower than in the past.

Therefore, the residence time of the exhaust gas becomes longer and heat radiation is improved.

Next, this exhaust gas enters the exhaust chamber 15 after heating the fluid flowing outside the heat exchange pipes 12 through the peripheral walls thereof, in other words, after giving heat to the fluid.

Since low-temperature air containing no exhaust gas flows into the exhaust chamber 15 from the bypass pipe 5, this air and the exhaust gas are mixed in this chamber, and this low-temperature exhaust gas is discharged outdoors through the exhaust stack 16.

In addition, in the present invention, as in the illustrated example described above, the above-mentioned dispersion material 9
If the ignition device 17 is disposed on the peripheral wall of the combustion chamber 6 between the burner 2 and the flame port 2a of the burner 2, the fuel gas can be guided to the ignition device 17 side by the dispersion element 9, and ignition can be performed smoothly.

As shown above, the present invention connects a heat exchanger consisting of multiple heat exchange pipes arranged in parallel to the exhaust side of a combustion chamber containing a burner, and connects the other end of this heat exchanger to the exhaust path. A combustion device comprising: 1. A dispersion element for dispersing the flame of the burner to the outer periphery of the combustion chamber through which heat can be exchanged through the peripheral wall is provided close to the flame port of the burner; Since a gas distribution body for diffusing combustion exhaust gas to the outer periphery of the combustion chamber is provided in the vicinity of the connection between the chamber and the heat exchanger, first, the combination of the above-mentioned dispersion element and the gas distribution body is required. As an effect of this, heat is forcibly emitted toward the outer periphery of both the dispersion element and the gas distribution element, making it easier to radiate heat, and the heat radiation effect becomes greater with a small area.

In the flame dispersion section, it mixes well with air, and in the gas distribution section, cooled exhaust gas and uncooled exhaust gas mix well, preventing local increases in exhaust gas temperature and dissipating heat uniformly throughout the heat exchanger. The life of the exchanger can be maintained for a long time.

In addition, the residence time of the exhaust gas in the combustion chamber is increased by the dispersion element and the gas dispersion element, and the heat exchange efficiency through the inner wall of the combustion chamber is improved, thereby making it possible to significantly improve the thermal efficiency as a whole.

Furthermore, the effect of the dispersion element is that the external flame and secondary air are better mixed, the flame does not become long and complete combustion occurs, preventing the generation of carbon monoxide and soot, and by shortening the flame, the combustion chamber is reduced. This facilitates downsizing of the combustion device, and by dispersing the flame over the entire circumference, heat can be dispersed and local heating can be prevented.

In addition, the dispersion element becomes high temperature, which promotes combustion and contributes to complete combustion.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional front view showing an embodiment of the present invention. 2: Burner, 2a: Its flame opening, 6: Combustion chamber, 9: Dispersion required, 11: Heat exchanger, 13: Gas distribution body.

Claims (1)

[Claim for Utility Model Registration] A heat exchanger consisting of multiple heat exchange pipes arranged in parallel is connected to the exhaust side of a combustion chamber containing a burner, and the other end of the heat exchanger is connected to the exhaust passage. In the combustion device, a flame dispersion element for dispersing the flame of the burner to the outer circumference of the combustion chamber where heat can be exchanged through the peripheral wall is provided close to the flame port of the burner, and A combustion device characterized in that a gas distribution body is provided close to a connection part with a heat exchanger to diffuse combustion exhaust gas to the outer circumference of the combustion chamber.