JPS5815688B2 - The most important thing is the most important thing. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forced draft combustion device that forcibly supplies air to a burner via a fan motor and controls combustion output according to the amount of air blown. This prevents the occurrence of explosive phenomena.

Conventionally, in combustion devices that control the combustion output of a burner in accordance with the amount of air blown by a fan motor, the most common method is to adjust the amount of fuel in response to the amount of air blown.

However, a common problem with this type of combustion apparatus is that the amount of fuel ejected increases when the burner is ignited, causing an explosion phenomenon.

The reason for this is that the flame has ventilation resistance.If we compare the amount of air flowing into the combustion section when there is a flame and when there is no flame, assuming the rotation of the fan motor is constant, it is clear that the former is better. is a small amount.

This is because the flow of air is obstructed by the ventilation resistance of the flame.

Therefore, in the above-mentioned conventional combustion apparatus, the amount of air flowing into the combustion section immediately before ignition where no flame is formed is large, and the amount of fuel increases proportionally, resulting in an explosion at the time of ignition.

Figure 1 shows the relationship between combustion air volume and gas volume when gas is used as fuel. Conventionally, ignition occurs at the 0 point,
The amount of gas decreases and becomes stable until point B, where a flame is formed.

The present invention prevents explosion by igniting at point A with a small amount of lice and gas, and furthermore, after ignition, the combustion output point B is quickly moved to a predetermined combustion output point. An example will be explained with accompanying drawings.

In FIG. 2, 1 is a burner, 2 is its persimmon air passage, 3 is an exhaust passage, and a heat exchange section 4 between combustion heat and air is formed in the middle.

5 is a fan motor provided in the air supply path 2, and 6 is the air supply path 2.
A solenoid valve 7 and a fuel controller 8 are connected to the fuel supply path with its tip opening facing.

The fuel controller 8 proportionally controls the amount of fuel in response to the air volume of the fan motor 5, and serves as a response means.
For example, it is conceivable that the amount of air is detected by the static pressure in the air supply path 2, and the amount of fuel is adjusted by operating a diaphragm valve or the like based on the change in pressure.

9 is a bypass path that short-circuits the air supply path 2 and the exhaust path 3;
0 is a bypass air volume control body that controls this opening degree.

Reference numeral 11 denotes a combustion detector for detecting combustion in the burner 1, and is, for example, of a liquid expansion type.

That is, when the burner 1 burns, the combustion detector 1
The liquid in the bypass passage 9 thermally expands, and the bypass air volume control body 10 moves forward by this liquid expansion force to narrow the opening degree of the bypass passage 9.

12 is a spark plug.

In the above configuration, when the fan motor 5 is started and the solenoid valve 7 is opened, the burner 1 is not burning in this state, so the bypass air volume controller 10 fully opens the bypass passage 9, and therefore the air is divided into bypass path 9 and burner 1.

When the amount of air flowing into the burner 1 is small, the fuel controller 8 throttles the amount of fuel flowing out from the fuel supply path 6.

Therefore, a small amount of fuel-air mixture is initially ejected from the burner 1, and when it is ignited by the spark plug 12, combustion starts quietly.

When the burner 1 starts combustion, the bypass air volume controller 10 gradually closes the bypass passage 9 via the combustion detector 11, so the amount of air blown to the burner 1 increases, and the amount of fuel supplied increases accordingly. , which eventually leads to steady combustion output.

As explained above, the present invention includes a fan motor that supplies combustion air to a burner, a bypass path that short-circuits the air supply side and exhaust side of the burner, and an opening of the bypass path that responds to the combustion state of the burner. a bypass air volume control body that controls the air flow rate;
Since it consists of a fuel supply path with a fuel controller connected in the middle that responds to the amount of combustion air, there is no explosion at the time of ignition, and a safe and quiet combustion operation can be started. Its industrial value is great, as it significantly improves ignition performance because it ignites at the bottom.

[Brief explanation of the drawing]

Figure 1 is a diagram of the relationship between combustion air volume and combustion amount at the time of ignition,
FIG. 2 is a partially cutaway sectional view of a combustion device in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Burner, 5... Fan motor, 6... Infant fuel supply path, 8... Fuel controller, 9... Bypass path, 10... Bypass air volume control body.

Claims (1)

[Claims] 1 A fan motor that feeds combustion air to the burner, a bypass path that short-circuits the air supply side and exhaust side of the burner, and a bypass path that responds to the combustion state of the burner and when a flame is formed in the burner. A forced draft combustion device consisting of a bypass air volume control body that moves in the direction of closing the burner, and a fuel supply path that is connected to a fuel controller that increases the amount of combustion air (and increases the amount of fuel supplied to the burner).