JPH0717944Y2 - Combustion type combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an incomplete combustion prevention device for a forced combustion type combustion device using a combustion blower.

<Prior Art> A conventional forced combustion type combustion apparatus will be described with reference to FIG.

The forced combustion type combustion device is a burner 10 in which gasified fuel is supplied through a fuel supply device (not shown), and external air is supplied to the burner 10 to mix with the gasified fuel to generate a mixture. Combustion blower 20 to be generated, a combustion tube 30 attached to the burner 10 and having a combustion chamber 31 inside, and incomplete combustion prevention that stops the supply of the gasified fuel when incomplete combustion occurs And device 40.

The blower 20 for combustion, which is an air supply device that supplies outside air, is a motor.
It has a fan 21 and a blower fan 22 attached to the output shaft 211 of the motor 21, and the motor 21 and the blower fan 22 are surrounded by a fan casing 23 and an air supply case 24 described later. An air supply case 24 is attached to the fan casing 23, and an air supply filter 25 is attached below the air supply case 24, that is, on the outside air open side. This combustion blower 20 has a burner cover described later.
Outside air is sucked into the inside of the burner cover 11, and this outside air is accumulated inside the burner cover 11 at a constant pressure.

A burner cover 11 is provided above the combustion blower 20, that is, on the downstream side of the combustion blower 20. The burner 10 is attached to the burner cover 11 via a packing 12. In addition, the burner cover 11 has packing
A combustion cylinder 30 is attached via 32, and a combustion chamber 31 is formed inside the combustion cylinder 30. Exhaust gas such as carbon dioxide generated after combustion is discharged by an exhaust device such as a chimney provided above the combustion cylinder 30.

The incomplete combustion prevention device 40 is for preventing incomplete combustion that causes carbon monoxide poisoning and the like, and includes a substantially T-shaped burner thermopipe 41 and the burner blower 20 from the outside air to the burner thermopipe 41. A cold air pipe 42 for introducing
A burner thermostat (eg, bimetal thermostat) 43 attached to the burner thermostat pipe 41 is provided. One end of the burner thermopipe 41 communicates with the combustion cylinder 30, and the other end is open. The cold air pipe 42 has a cover pipe 111 whose one end is provided on the burner cover 11.
And the other end communicates with the burner thermopipe 41. Therefore, outside air is introduced into the burner thermopipe 41 through the cold air pipe 42.
A burner thermo 43 is attached to the outside of the cold air pipe 42 of the burner thermo pipe 41 via a thermo mounting plate 411, and if the surface temperature of the thermo mounting plate 411 exceeds a preset temperature, fuel is supplied. The device is turned off to stop the combustion.

Next, the operation of the above-described conventional forced combustion type combustion device and incomplete combustion prevention device 40 will be described.

When the combustion blower 20 is started, the outside air from which dust and dust have been removed is sucked into the burner cover 11 via the air supply filter 25 and accumulated at a constant pressure. The outside air sucked and accumulated in the burner cover 11 is partly introduced into the burner 10 and partly introduced into the burner thermo pipe 41 through the cover pipe 111 and the cold air pipe 42 as shown by an arrow → in FIG. ,
It flows out from the burner thermo pipe 41 to the combustion chamber 31 or the open side.

The fuel is gasified by the fuel supply device and supplied to the burner 10, and is mixed with the outside air introduced from the burner cover 11 at a predetermined ratio to form a mixture. The mixture is ignited by an ignition device (not shown), and the ignition is confirmed by a flame detection device (not shown). If complete combustion is taking place,
That is, when sufficient outside air is supplied from the burner cover 11 side, since outside air is also supplied to the burner thermopipe 41 via the cold air pipe 42, heat conduction from the combustion tube 30 and from the combustion chamber 31. The temperature of the thermo-mounting plate 411 does not rise due to the radiant heat of, and normal combustion continues.

The incomplete combustion occurs when dust or dust adheres to the air supply filter 25 in a large amount to reduce the air supply amount or the exhaust device is blocked. When the exhaust device is closed, hot air flows back from the combustion chamber 31 to the burner thermopipe 41 as shown in FIG. The hot air flowing back is released to the outside air while heating the thermo mounting plate 411. The heated thermo mounting plate 411 operates the burner thermo 43, turns off the fuel supply device, and stops combustion. If the air supply is decreasing, burner thermopipe
Since the amount of outside air introduced into 41 is reduced, the temperature of the thermo mounting plate 411 rises due to heat conduction from the combustion cylinder 30 and radiant heat from the combustion chamber 31, and similarly the fuel supply device is turned off and combustion is stopped. Let

In this way, with respect to the exhaust and air supply side blockages that cause incomplete combustion, the operating temperature of the burner thermostat 43, that is, if the OFF temperature of the fuel supply device is set appropriately beforehand,
It is possible to prevent incomplete combustion.

<Problems to be Solved by the Invention> However, the above-mentioned conventional incomplete combustion prevention device for the forced combustion type combustion device has the following problems.

That is, in the case of blockage on the exhaust side, the reverse flow rate of high-temperature hot air from the combustion chamber is larger than the introduction of outside air from the cold air pipe side
The temperature of the thermo mounting plate rises rapidly and the burner thermostat operates quickly. That is, the temperature difference of the thermo-mounting plate between the complete combustion and the incomplete combustion is large, and the temperature setting of the burner thermostat which can stop the combustion before the incomplete combustion can be performed easily and with a sufficient margin.

On the other hand, in the case of blockage on the air supply side, it is determined only by heat conduction and radiant heat, so the temperature difference between the thermo mounting plate during complete combustion and incomplete combustion is not so large, and the blockage on both the supply side and the exhaust side is Therefore, it is very difficult to set the operating temperature of the burner thermostat so as to have the simultaneous effect. Therefore, in reality, when the exhaust side is blocked, the combustion can be stopped before the incomplete combustion occurs, but when the air supply side is blocked, the incomplete combustion is continued for a while and then the combustion is stopped. It is supposed to stop.

The present invention was devised in view of the above circumstances, and provides a forced combustion type combustion device having an incomplete combustion prevention device that can stop combustion earlier before incomplete combustion occurs in any case of blockage. The purpose is to do.

<Means for Solving the Problems> A forced combustion type combustion device according to the present invention is provided with a combustion blower that sucks in outside air, and a fuel gasified from a fuel supply device, which is provided on the downstream side of the combustion blower. A forced combustion combustion device having a burner to which is supplied, a combustion cylinder whose interior is a combustion chamber, and an incomplete combustion prevention device that stops the supply of the fuel when incomplete combustion occurs, One of the incomplete combustion prevention devices is connected to the combustion chamber and the other is open, and a burner thermopipe that is attached to the burner thermopipe and that turns off the fuel supply device during incomplete combustion, and a burner thermostat. A communication pipe that connects the open side of the pipe and the air supply case is provided.

<Operation> Gasified fuel is supplied from the fuel supply device, and external air is supplied from the combustion blower to the burner, and both form a mixture to form a combustion flame.

If dust or dirt adheres to the air supply filter, the amount of air blown to the burner by the combustion blower may decrease, causing incomplete combustion. At the same time, in this case, high-temperature hot air is introduced into the air supply case through the burner thermo pipe and the communication pipe, the temperature of the thermo mounting plate rises, the fuel supply device is turned off by the burner thermo, and combustion is stopped.

When the exhaust device is blocked, high temperature hot air is introduced into the air supply case through the burner thermo-pipe → communication pipe to increase the pressure in the combustion chamber, and the temperature of the thermo-mounting plate rises to increase the burner thermostat. The fuel supply device is turned off to stop the combustion.

<Embodiment> An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a forced combustion device according to the present invention. It should be noted that parts that are substantially the same as those of the related art will be denoted by the same reference numerals and will be described.

A forced combustion type combustion device according to the present invention includes a combustion blower 20 that sucks in outside air, a burner 10 that is provided on the downstream side of the combustion blower 20, and that is supplied with gasified fuel from a fuel supply device. A combustion chamber 30 having a combustion chamber 31 inside, and an incomplete combustion prevention device 40 for stopping the supply of the fuel when incomplete combustion occurs, The prevention device 40, one of which is in communication with the combustion chamber, the other is open burner thermopipe 41, and a burner thermostat 43 which is attached to the burner thermopipe 41 and turns off the fuel supply device at the time of incomplete combustion,
Opening side of burner thermopipe 41 and air supply case pipe 241
And a communication pipe 42 that communicates with the.

The combustion blower 20 includes a motor 21 and an output shaft of the motor 21.
It has a blower fan 22 attached to 211, and the motor 21 and the blower fan 22 are surrounded by a fan casing 23 and an air supply case 24 described later. An air supply case 24 is attached to the fan casing 23, and an air supply filter is provided below the air supply case 24, that is, on the outside air open side.
25 is installed. Further, an air supply case pipe 241 is provided in the middle part of the air supply case 24. The burner 10 and the burner cover surrounding the burner 10 are provided on the downstream side of the combustion blower 20, that is, on the upper side in FIG.
11 and are provided.

The burner cover 11 accumulates the outside air sucked by the combustion blower 20 at a constant pressure, and is formed into a substantially cylindrical shape. An opening 112 for introducing the outside air from the combustion blower 20 is formed on the lower surface of the burner cover 11, and a mounting hole 113 for mounting the burner 10 on the upper surface. The burner 10 is attached to the attachment hole 113 via the packing 12.

Above the burner cover 11, a substantially cylindrical combustion cylinder 30 having an open bottom is provided via a packing 32. The tip of the burner 10 is exposed at the bottom of the combustion tube 30. Above the combustion cylinder 30, an exhaust device such as a chimney (not shown) is connected. The incomplete combustion prevention device 40 is for preventing incomplete combustion due to some cause, for example, blockage of the air supply or exhaust device, and is for preventing accidents due to incomplete combustion. The incomplete combustion prevention device 40 includes a burner thermo pipe 41, one of which communicates with the combustion chamber 31, a communication pipe 42 which communicates between the burner thermo pipe 41 and the air supply case pipe 241, and a burner thermo pipe 41. The burner thermostat 43 attached via the attachment plate 411. Burner thermopipe 41
Are formed in a substantially L shape, and one of them is formed in the combustion chamber 31.
The air supply case pipe 241
A communication pipe 42 attached to the is connected. Therefore, the combustion chamber 31 and the air supply case 24, the burner thermo pipe 41,
This means that they communicate with each other through the communication pipe 42 and the air supply case pipe 241. Further, a burner thermo 43 is attached to the outer surface of the burner thermo pipe 41 via a thermo attachment plate 411. This burner thermo 43 is a thermo mounting plate 411
When the surface temperature of the above becomes higher than a preset temperature, it is sensed, the fuel supply device is turned off, and the combustion is stopped.

Next, the operation of the forced combustion type combustion device according to the present invention will be described.

Gasified fuel is supplied from the fuel supply device to the burner 10 by the combustion blower 20, and the outside air is supplied to the burner 10 to form a combustion flame F. If no dust or dirt adheres to the air supply filter 25, that is, if the air supply device is not closed, or if the exhaust device is not closed, complete combustion is continued. While continuing this complete combustion, since the conduit resistance of the communication part of the incomplete combustion prevention device 40 is too large than the air supply resistance of the air supply filter 25,
The amount of hot air introduced from the combustion chamber 31 to the air supply case 24 is extremely small, and the temperature of the thermo mounting plate 411 is kept low.

When the amount of dust or dust adhering to the air supply filter 25 gradually increases and the amount of air blown to the burner 10 by the combustion air blower 20, which is an air supply device, decreases, the combustion starts to shift from complete combustion to incomplete combustion. Then, as the outside air introduced through the air supply filter 25 decreases, the amount of hot air introduced from the combustion chamber 31 to the air supply case 24 through the incomplete combustion device 40 increases in inverse proportion to the decrease in the outside air, and thus the thermo mounting plate. The temperature of 411 increases, the fuel supply device is turned off by the burner thermostat 43, and the combustion is stopped.

Further, when the exhaust device is closed, the pressure in the combustion chamber 31 rises, so that the combustion is stopped similarly to the case where the air supply side is closed.

<Effects of the Invention> A forced combustion type combustion apparatus according to the present invention includes a combustion blower that draws in outside air, and a burner that is provided downstream of the combustion blower and that is supplied with gasified fuel from a fuel supply device. And a combustion cylinder having a combustion chamber inside, and an incomplete combustion prevention device that stops the supply of the fuel when incomplete combustion occurs. The device is equipped with a burner thermopipe, one of which is in communication with the combustion chamber and the other of which is open, and a burner thermostat which is attached to this burner thermopipe and turns off the fuel supply device at the time of incomplete combustion, and the open side of the burner thermopipe. And a communication pipe communicating with the air case pipe.

Therefore, the temperature of the thermo mounting plate is kept low during complete combustion, and combustion can be stopped before incomplete combustion occurs.

Moreover, the same effect can be obtained regardless of whether the air supply side or the exhaust side is closed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a forced combustion type combustion apparatus according to the present invention, and FIG. 2 is a vertical sectional view showing an embodiment of a conventional forced combustion type combustion apparatus. 10 …… Burner, 20 …… Combustion blower, 30 …… Combustion tube, 31
...... Combustion chamber, 40 ...... Incomplete combustion prevention device, 41 ...... Burner thermo pipe, 42 ...... Communication pipe, 43 ...... Burner thermo.

Claims (1)

[Scope of utility model registration request] 1. A combustion blower that sucks in the outside air, a burner that is provided on the downstream side of the combustion blower and that is supplied with gasified fuel from a fuel supply device, and a combustion that has a combustion chamber inside. In a forced combustion type combustion device having a cylinder and an incomplete combustion prevention device that stops the supply of the fuel when incomplete combustion occurs, one of the incomplete combustion prevention device is connected to the combustion chamber and the other is An open burner thermopipe, a burner thermostat attached to the burner thermopipe and turning off the fuel supply device at the time of incomplete combustion, and a communication pipe connecting the open side of the burner thermopipe and the air supply case are provided. A forced combustion type combustion device characterized by the above.