JP3178145B2 - Gas Combustor Ignition Method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustor.

[0002]

2. Description of the Related Art In a conventional gas combustor, for example,
According to the type of gas used, the number of revolutions of the blower fan at the time of ignition is determined in advance, and when the number of revolutions is reached, the fuel on-off valve of the gas burner is opened and a discharge ignition operation by an igniter has been adopted. . By doing so, while ensuring reliable ignition according to the type of gas,
At the time of ignition, poor combustion flame was prevented from being generated.

[0003]

However, in the conventional method of igniting gas in a gas combustor, poor ignition due to differences in gas components within the same gas type and poor combustion flame during ignition are eliminated. I couldn't do that. Therefore, the present invention solves the above-described drawbacks of the conventional gas combustor, and provides a gas combustion device ignition method capable of exhibiting good ignition performance according to the gas regardless of the gas supplied. For the purpose of providing.

[0004]

In order to solve the above-mentioned object, a method for igniting a gas combustor according to the present invention is to open a fuel on-off valve of a gas burner and to perform a discharge ignition operation by an igniter under blowing by a blowing fan. A method of igniting a gas burner in which the gas burner is ignited, wherein if the ignition does not occur even after a certain period of time from the start of the ignition operation by the igniter, the degree of air blowing by the blowing fan is set to be lower than the current level. Reattachment that tries to reignite with a certain percentage lowered
When a fire operation is performed and the ignition is performed by the re-ignition operation,
Uses the blast at the time of ignition at the next operation
The ignition operation is performed, while the ignition is performed within the predetermined time.
Proper ignition time area less than the ignition that defines pre-Me even if you fire
If it is characterized by being configured so than blowing about when the ignition time of the order of supplying air by the air supply fan at the next operation is increased by a certain percentage.

[0005]

In accordance with the above SL features, the operation of the gas burner is started, air fan feeding not a previously turned on, the blower fan is controlled to be about blowing determined in the previous operation . Then, at the time when the control is performed to a predetermined degree, the fuel on-off valve of the gas burner is opened, and the ignition operation by the igniter is started. In this case, if the ignition is not performed even after the elapse of the certain time, the degree of air blowing by the air blowing fan is reduced by a certain ratio from the current degree, and the re-ignition operation is performed. This operation is repeated until ignition is performed. Then, when ignition is performed, the degree of air blow by the blower fan at that time is set to the degree of air blow for ignition in the next operation. By doing so, the gas combustor will learn the degree of air blowing to ensure ignition, and even if gas fuel of any component is supplied, it will be sure after several operations. Ignition can be performed. on the other hand,
If the ignition is performed within a certain time, the time until the ignition, that is, whether the ignition time is within a predetermined appropriate ignition time region is determined, and if the ignition is less than the appropriate ignition time region In the next operation, the degree of air blow by the blower fan at the next operation is increased by a certain percentage from the degree of air blow at the time of this ignition
Will be done. By doing so, the gas combustor learns how much air to blow to make the state of the flame at the time of ignition proper, and even if gas fuel of any component is supplied, several times After the operation, it is possible to prevent the occurrence of poor combustion flame at the time of ignition due to insufficient air.

[0006]

FIG. 1 is an overall configuration diagram of a gas combustor used in the method of the present invention, FIG. 2 is a flowchart of an ignition operation, FIG. 3 is a time chart of each part when ignition is not performed, and FIG. It is a time chart when it is shorter than the area.

In FIG. 1, the gas combustor is configured as a gas water heater, and a blower fan 1 blows air into a case 2. A gas burner 3 is provided in the case 2, and the gas burner 3 has a gas fuel supply pipe 4.
Are connected to the supply pipe 4 and the fuel on-off valves V ₀ , V ₁ , V
_Two are provided. V ₂ is open if you use the entire burner 3. Reference numeral 5 denotes an igniter for igniting the burner 3, which performs a discharge ignition operation at the time of ignition. Reference numeral 6 denotes a frame rod for detecting whether or not the burner 3 is ignited. Water from the water inlet pipe 7 is heated while passing through the heat exchange coil 8 and flows out to the hot water pipe 9. Reference numeral 10 denotes a water flow sensor, and the combustion operation is started when the water flow sensor 10 detects the water flow.

Reference numeral 11 denotes a control unit built in the microcomputer.
From the frame rod 6, water flow sensor
The information from 10 is input and predetermined operation commands are output to the blower fan 1, the igniter 5, and the fuel on-off valves V ₀ , V ₁ , V ₂ .

The ignition operation at the start of the combustion operation of the combustor performed by the control of the control unit 11 will be further described with reference to the flowchart of FIG. 2 and the time charts of FIGS.

Now, when a hot water supply curl (not shown) at the end of the hot water pipe 9 is opened and an incoming water flow is generated in the water inlet pipe 7, the water flow sensor 10 detects this, and the combustion operation is started. When the combustion operation is started, first, the control unit 11 turns on the blower fan 1 and starts blowing (S1). Then, the air blower fan 1 is adjusted to have a predetermined ignition rotation speed which is determined at the time of the previous operation and stored at the time of the previous operation, and when the ignition rotation speed is reached (S2), the fuel switching valve is opened. V ₀ and V ₁ are released (S3). At the same time, the discharge ignition operation of the igniter 5 is started (S4). The discharge ignition operation of the igniter 5 is continued for a fixed time t ₁ , during which the control unit 11 determines whether or not the flame rod 6 detects a flame and turns on (S5). And wherein if the predetermined time t ₁ frame rod 6 even after is not turned on (YES in S6), it is determined whether or not already made fixed number of re-ignition operation (S7), previously fixed number of times (this embodiment In the example, as shown in FIG. 3, the number of times of the re-ignition operation is set to two times), the operation is stopped (S8).

If the re-ignition operation has not reached the predetermined number, the control unit 11 closes the fuel on-off valves V ₀ and V ₁ once,
Further, the igniter 5 is turned off (S9), and the rotation speed of the blower fan 1 is adjusted to the first reignition rotation speed (see FIG. 3) in which the rotation speed of the blower fan 1 is reduced by a fixed ratio from the current ignition rotation speed (S10). ), The fuel on-off valves V ₀ and V ₁ are opened again (S3), and the igniter 5 is turned on (S4) to perform the ignition operation. This ignition operating time in the re-ignition operation can be the same as a predetermined time t ₁ described above, since the ignition of the start of the operation is delayed, a short time of, as shown in FIG. 3 in Example t ₂ And time. Then, it is further determined whether or not the ignition is performed within the predetermined time t ₂ (S
5, S6) If no, the current regenerative rotation speed of the blower fan 1 is further adjusted to a second reignition rotation speed (see FIG. 3), which is reduced by a certain ratio, and ignition is performed. Repeat the operation. If the ignition does not occur even if the re-ignition operation is repeated twice, the operation is stopped as described above.

When the ignition is performed by the re-ignition operation, the control unit 11 stores the ignition rotation speed of the blower fan 1 at that time as the first ignition rotation speed in the next combustion operation. On the other hand, if the frame rod 6 is turned on within the predetermined time t1 in the _first ignition operation (YES in S5), the process proceeds to step S11, in which the igniter 5
It is determined whether or not the time from the start of the ignition operation to the time when the flame rod 6 is turned on, that is, the ignition time t (see FIG. 4) is within a predetermined appropriate ignition time region D. The suitability ignition time domain D, for example, at the fixed time t ₁ within the start of the ignition operation by the igniter 5, and may be a predetermined time t ₄ or more ranges of one more. That is, when the degree of mixing of air with fuel is low at the time of ignition, ignition is performed earlier, but a flame of poor combustion is generated, and soot and carbon monoxide due to incomplete combustion are released.
Therefore, by preliminarily experiments in advance by measuring the time until ignition when mixed with air to the extent that it is possible to obtain good ignition flame, this as t ₄ h, the time until t ₄ ~t ₁ It is stored as an appropriate ignition time area D.

The ignition time t is within the appropriate ignition time region D (S11
In the case of (No), the control unit 11 stores the current ignition rotation speed as the ignition rotation speed for the next operation (S12). On the other hand, when the ignition time t is shorter than the appropriate ignition time area D (Yes in S11) (see FIG. 4), the control unit 11 uses the rotation speed increased by a certain ratio from the current ignition rotation speed for the next operation. The number of ignition operations is stored (S13).

[0014]

According to the method for igniting a gas combustor according to the first aspect of the present invention, when the ignition does not occur even after a lapse of a predetermined time from the start of the ignition operation by the igniter. Is a re-ignition operation that attempts to re-ignite by lowering the degree of air blow by the blower fan by a certain ratio from the current level.
If the re-ignition operation ignites, the next
Ignition using the degree of blast at the time of the ignition even during multiple operations
Operation, while igniting within the fixed time
Ignition der for correct ignition time domain which defines Me pre even if
That case, since it is configured so than blowing about when the ignition time of the order of supplying air by the air supply fan at the next operation is increased by a certain percentage, the degree of blast for gas combustors that be reliably ignites This means that the ignition can be reliably performed after several operations, no matter what kind of gas fuel is supplied. In addition, the gas combustor learns how much air to blow to make the flame state appropriate at the time of ignition, so even if the gas fuel of any component is supplied, after several times of operation, there is a shortage of air. It is possible to prevent the occurrence of poor combustion flame at the time of ignition and to stably ignite with a good flame.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a gas combustor used in the method of the present invention.

FIG. 2 is a flowchart of an ignition operation.

FIG. 3 is a time chart of each part when ignition does not occur.

FIG. 4 is a time chart of each part when the ignition time is shorter than a proper ignition time region.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 blower fan 3 gas burner 5 igniter 6 flame rod 11 control unit V ₀ , V ₁ , V ₂ fuel on-off valve t ignition time t ₁ fixed time D appropriate ignition time area

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Sasaki 32nd Akashi-cho, Chuo-ku, Kobe City, Hyogo Prefecture Within Noritz Co., Ltd. (72) Inventor Fumimasa Fujimoto 32nd Akashi-cho, Chuo-ku, Kobe City, Hyogo Pref. (56) References JP-A-4-198621 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 3/08 F23N 5/20

Claims (1)

(57) [Claims] 1. A method for igniting a gas burner in which a gas on-off valve of a gas burner is opened under a blown air by a blower fan and a discharge ignition operation is performed by an igniter to ignite the gas burner. If ignition does not occur after a certain period of time from the start of ignition operation,
The re-ignition operation of trying to re-ignite by lowering the degree of air blow by the blower fan by a certain ratio from the current level is performed.
If ignition occurs due to fire, the
The ignition operation is performed by using the airflow at the time of ignition.
And, on the other hand, when it is ignited ignited proper than the ignition time domain which defines Me pre even within the predetermined time, the next time
Wearing of this time the extent of supplying air by the air supply fan at the time of the operation
A method for igniting a gas combustor, characterized in that the rate is increased by a certain ratio from the degree of air blowing at the time of fire .