JP2000146172A - Abnormality detection device for combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detection apparatus capable of surely detecting an abnormality of combustion as a whole burner even if spider nests are formed in one of two mixed gas supply parts or a mixed gas flow passage communicating with them or dust is accumulated. SOLUTION: In an abnormality detection device for a combustion apparatus having a burner B provided with mixed gas supply parts for supplying a mixed gas at both end parts in a row direction of a row of burner ports in a mixed gas flow passage communicating with the burner ports, combustion flame temperature detection means 17a, 17b for detecting temperatures of combustion flames of the burner B and an abnormality detection means C for detecting an abnormality of combustion of the burner B on the basis of detection information of the combustion flame temperature detection means 17a, 17b, the combustion flame temperature detection means 17a, 17b are installed at both sides in a center in a longitudinal direction of the row of the burner ports.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel-air mixture passage communicating with a row of flame holes, which is provided at both ends in the direction in which the row of flame holes is arranged.
A burner provided with a mixed gas supply unit for supplying a mixed gas, combustion flame temperature detecting means for detecting a temperature of a combustion flame of the burner, and combustion of the burner based on detection information of the combustion flame temperature detecting means. The present invention relates to a combustion device abnormality detection device provided with abnormality detection means for detecting abnormality.

[0002]

2. Description of the Related Art A combustion apparatus having such a configuration is, for example,
It is used for gas instantaneous water heaters and the like.Conventionally, only one combustion flame temperature detecting means composed of a thermocouple or the like is provided for a burner, and a lead wire or the like connected to the thermocouple is provided. From the relationship, that one thermocouple,
The burner was provided at a position deviated to one of the ends with respect to the center in the longitudinal direction of the flame hole row.

[0003]

By the way, in the above-described combustion apparatus, any one of the mixed gas supply units provided at both ends of the mixture flow passage in the direction in which the flame holes are arranged is arranged. Or a spider web stretches in the mixture flow path communicating with it, or when dust is attached or partially blocked, for example, in the flame hole row portion on the non-blocking side,
Despite being burned in a relatively near normal state, incomplete combustion may occur in the flame hole row portion on the closed side, resulting in different combustion states on both sides in the longitudinal direction of the flame hole row. is there. At that time, in the conventional apparatus, as described above, the combustion flame temperature detecting means such as a thermocouple is provided on one side in the longitudinal direction of the row of flame holes.
For example, when the combustion flame temperature detecting means is positioned corresponding to the flame hole row portion on the non-blocking side, incomplete combustion is detected even though incomplete combustion has occurred on the other side. There were inconveniences such as being unable to do so, and it was not always satisfactory.

The present invention focuses on such a conventional problem. The purpose of the present invention is to form a spider web or dust in one of the mixed gas supply sections and the mixed gas flow path communicating therewith. It is an object of the present invention to provide a combustion device abnormality detection device that can reliably detect a combustion abnormality of the burner as a whole even if it adheres.

[0005]

According to the first aspect of the present invention, there is provided a combustion flame temperature detecting means for detecting a temperature of a combustion flame of a burner. Are provided on both sides. Therefore,
Even if a spider web or dust adheres to one of the mixed gas supply sections or the mixed gas flow path communicating with it, different combustion conditions occur on both longitudinal sides of the flame hole row, The combustion flame temperature detecting means provided on both sides at the center in the longitudinal direction surely detects the temperature of the combustion flame, and can reliably detect abnormal combustion in the burner as a whole.

According to the second aspect of the present invention, the abnormality detecting means compares the detection value of the combustion flame temperature detecting means,
If the difference between the two detection values exceeds the abnormality detection value for the burner, it is determined that the burner is causing abnormal combustion, so the combustion flame generated along the row of flame holes loses its balance in the longitudinal direction. In the case where there is a possibility that the entire burner may generate a large amount of CO gas, the abnormal combustion can be detected and the subsequent measures can be executed appropriately.

According to the third aspect of the present invention, a heat exchanger for hot water supply is provided on the upper part of the cylinder body forming the combustion chamber of the burner, and the burner is used for water heating, and ,
A combustion chamber temperature detecting means for detecting an ambient temperature in the combustion chamber is provided. If the abnormality detecting means detects a combustion chamber temperature detecting means exceeding a combustion chamber abnormality detecting value, the burner has caused a combustion abnormality. If the ambient temperature inside the cylinder body becomes abnormally high due to the so-called exhaust gas obstruction due to the combustion products and dust in the exhaust gas adhering to the heat exchanger, the abnormal combustion should be detected. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which an abnormality detection device for a combustion device according to the present invention is applied to a gas instantaneous water heater will be described with reference to the drawings. This gas instantaneous water heater, as shown in FIG.
A fin tube type heat exchanger 2 for hot water supply is provided above the cylindrical body 1 forming the combustion chamber of the gas burner B, and the heat exchanger 2 is connected to a water supply path Wi and a hot water supply path Wo.

The water supply passage Wi is provided with a water stop valve 3, a water governor 4 for adjusting a water supply amount in response to a change in water pressure, and a water supply passage W through a water supply amount to the heat exchanger 2 and a bypass passage Wb.
A diversion valve 5 for adjusting the ratio of the amount of bypass water supplied to o is connected to the hot water supply passage Wo, and a tapping tool 6 is connected to the hot water supply passage Wo via a flexible pipe. The gas burner B
A water supply responsive to an electromagnetically operated shut-off valve 7 and an interlocking rod 4a interlocked with the water governor 4 to open the gas supply passage G only when the water flows into the heat exchanger 2 Valve 8,
A gas governor 9 for keeping the supply pressure of the fuel gas at an appropriate pressure, and a regulating valve 10 for regulating the supply amount of the fuel gas are provided.

The operation of the gas instantaneous water heater having such a configuration is controlled by the controller C. When the push button type tapping operation tool 11 is pressed, the operation microswitch 12 is operated.
Is turned on, and at the same time, the water stop valve 3 is opened in conjunction with the pushing operation of the tapping operation tool 11, and the interlocking rod 4a interlocked with the water governor 4 opens the water pressure responsive valve 8 by the water pressure flowing into the water governor 4. The hydraulic micro switch 13 is turned on in response to the direction of valve opening. When the operation micro switch 12 and the hydraulic micro switch 13 are turned on, the controller C
, And an attraction current is applied to the coil 7a of the shut-off valve 7 to open the shut-off valve 7.

Accordingly, the fuel gas is supplied to the gas burner B from the gas supply path G and the ignition plug 1
At the time of the combustion, combustion air is supplied from an air inlet 15 which is opened below the cylinder body 1, and the exhaust gas after combustion is discharged through an exhaust port 16 which is opened above the cylinder body 1.
Is discharged from The combustion of the gas burner B heats two thermocouples 17a and 17b, which will be described later, and generates an electromotive force due to heating of one of the thermocouples 17a.
Attraction current continues to flow from the controller C to the coil 7a of the shutoff valve 7, and the opening of the shutoff valve 7 is maintained. Then, the water from the water supply passage Wi passes through the water stop valve 3 and the water governor 4 and is divided by the flow dividing valve 5, and a part of the water flows into the heat exchanger 2 and the rest flows through the bypass passage Wb. Hot water supply channel W
o, and is mixed with the hot water from the heat exchanger 2, and the hot water having the proper temperature is discharged from the hot water dispenser 6.

In this tapping state, tapping operation tool 1 again
When the water pusher 1 is pressed, the water stop valve 3 is closed in conjunction with the push operation, and the interlocking rod 4 a
Responds in a direction to close the hydraulic pressure responsive valve 8, and the hydraulic pressure responsive valve 8
To shut off the supply of fuel gas to the gas burner B to stop combustion. With the stop of the combustion of the gas burner B, the electromotive force of the thermocouple 17a disappears, and the controller C
The flow of the attraction current to the coil 7a of the shut-off valve 7 is stopped, and the shut-off valve 7 is also closed. Also, if a misfire occurs during the combustion of the gas burner B, the thermocouple 17a loses the electromotive force and the shut-off valve 7 Is closed to prevent the ejection of unburned gas.

Next, the configuration of the gas burner B will be described. As shown in FIG. 2, this gas burner B is composed of three flat and elongated plate-like burners 18 having the same structure, and each plate-like burner 18 has a pair of left and right mixed gas supply members as shown in FIG. Gas supply port 19a, 1 as a part
9b, and a pair of left and right mixing chambers 20a and 20b as a gas mixture passage communicating with the gas supply ports 19a and 19b, and two rows of flame holes 21 are provided on the upper surface. Then, the mixed gas flowing from the gas supply port 19a on the left side in the direction in which the flame hole rows 21 are arranged flows through the left mixing chamber 20a, and is ejected mainly from the left half in the direction in which the flame hole rows 21 are arranged. Burned, right gas supply port 19b
The mixed gas flowing from the fuel cell flows through the right mixing chamber 20b, and is ejected from the right half of the flame hole row 21 to be burned.

The three plate-shaped burners 18 having such a configuration are provided side by side at a predetermined interval from each other, and are fixed and held by a burner holder 22 composed of three members. Then, by using the burner holder 22 and assembling the connecting manifold 23 to the gas supply path G,
When a total of six gas nozzles 24 attached to the manifold 23 face each other adjacent to the gas supply ports 19a and 19b and fuel gas is blown from each gas nozzle 24,
The surrounding air is sucked together by the ejector action at that time. Thereafter, in each of the mixing chambers 20a and 20b, the fuel gas and the air are mixed and jetted, and the mixed gas supplied from the three gas supply ports 19a on the left is used as a row of flame holes of the three plate-shaped burners 18. At 21, the gas mixture is mainly injected from the left half and burns, and the mixed gas supplied from the three gas supply ports 19 b on the right is supplied to the flame hole row 21 of the three plate-shaped burners 18.
In this case, the fuel is mainly injected from the right half and burns.

Next, a description will be given of the combustion stop control executed when an abnormality such as a combustion abnormality occurs in the gas burner B or an exhaust gas blockage of the heat exchanger 2 occurs. First, regarding the combustion abnormality of the gas burner B, as described above, since the gas burner B has the pair of left and right gas supply ports 19a and 19b and the mixing chambers 20a and 20b, the thermocouples 17a and 17a as the combustion flame temperature detecting means are provided. 17b, that is, two thermocouples 17a and 17b
1 are arranged in a distributed manner with the center in the longitudinal direction as the center. Regarding the exhaust blockage of the heat exchanger 2, another thermocouple 25 is provided as a combustion chamber temperature detecting means for detecting an ambient temperature in the cylinder 1, and a thermosensitive part of the thermocouple 25 is formed on the cylinder 1. The temperature fuse 26 for the cylinder body which is provided so as to face the cylinder opening 1a and blows when the temperature near the outer periphery of the cylinder body 1 becomes abnormally high, and the temperature near the gas nozzle 24 becomes abnormally high. A temperature fuse 27 for the vicinity of the nozzle which is blown when the temperature becomes zero is also provided.

Both thermocouples 17a, 1 for detecting the combustion flame temperature
As shown in FIG. 4, one of the members 17a and the thermocouple 25 provided on the cylinder body 1 are connected in series so as to have electromotive forces of opposite polarities, and both ends connected in series. And an intermediate connection point thereof are electrically connected to input terminals a, b, and c of the controller C, and the thermocouples 17a, 17a,
The total value Vt of the output of the electromotive force at 25 and the output value of the thermocouple 17a for detecting the combustion flame temperature are input. Another thermocouple 17 for detecting the combustion flame temperature
b is electrically connected in parallel to the controller C so that the electromotive force can be independently detected, and the cylinder body temperature fuse 26 and the nozzle vicinity temperature fuse 27 are connected in series to form the controller C Is electrically connected to

The cylinder body temperature fuse 26 and the nozzle vicinity temperature fuse 27 have the same configuration, and although not shown, a fuse element having lead wires connected to both ends thereof is made flexible and flexible. It is inserted into a tube having heat resistance, and is fixed in the tube by binding two places on the outer periphery of the tube with a binder. The temperature fuse 27 for the vicinity of the nozzle which is arranged near the back side
Are arranged so as to be located below and near the gas nozzle 24.

The controller C includes a gas burner B
It also functions as abnormality detection means for detecting abnormal combustion, and is configured to detect abnormal combustion based on the detection information of the electromotive force of the thermocouples 17a, 17b, and 25 described above. That is, when the amount of the primary air for combustion sucked from the gas supply ports 19a and 19b becomes abnormally small, or when the oxygen concentration in the primary air for combustion abnormally decreases, the gas burner B causes incomplete combustion and burns. As the flame lengthens or the burning flame suddenly goes out,
As shown in (a), the thermocouple 1 for detecting the combustion flame temperature
When the electromotive force V1 of the thermocouple 7a decreases and the total value Vt of the electromotive forces of the thermocouples 17a and 25 decreases below the electromotive force determination level Vst for steady operation, the controller C sets the shut-off valve 7 to OFF. The valve is closed to cut off the supply of the fuel gas to the gas burner B to stop the combustion of the gas burner B.

A pair of left and right gas supply ports 19a, 19
b and one of the mixing chambers 20a and 20b, a spider's web is stretched, and the combustion state becomes unbalanced on both sides in the longitudinal direction of the flame hole array 21 of the gas burner B.
When there is a difference between the electromotive forces of
However, based on the difference, as the difference exceeds a preset burner abnormality detection value, it is determined that the gas burner B has caused combustion abnormality, the shut-off valve 7 is closed, and the gas burner B Stop burning.

Further, when combustion products and dust in the exhaust gas adhere to the heat exchanger 2 and the exhaust gas passage of the heat exchanger 2 is narrowed, the amount of exhaust gas which remains in the cylinder 1 increases, and 1
Ambient temperature rises inside. When the ambient temperature in the cylinder body 1 increases due to such exhaust blockage, and high-temperature exhaust gas flows out of the temperature measurement opening 1a, as shown in FIG.
The electromotive force V2 of the thermocouple 25 for detecting the temperature of the combustion chamber increases, and this electromotive force V2 is used as the thermocouple 17a for detecting the combustion flame temperature.
Of the thermocouples 17a,
25, the total value Vt of the electromotive force decreases. And the cylinder 1
When the ambient temperature inside the chamber becomes abnormally high, the total value Vt drops below the electromotive force determination level Vst for steady operation and exceeds the combustion chamber abnormality detection value, and the controller C closes the shut-off valve 7. To stop the combustion of the gas burner B.

When the ambient temperature inside the cylinder 1 becomes abnormally high, the temperature fuse 26 for the cylinder is blown, and a spider web is formed on the gas supply ports 19a and 19b of the gas burner B. A part of the injected fuel gas leaks, and the leaked gas is ignited and burned by the combustion flame of the gas burner B. When the temperature near the gas nozzle 24 becomes abnormally high, the nozzle near-temperature fuse 27 is blown. In this way, when the cylinder body thermal fuse 26 is blown or the nozzle vicinity thermal fuse 27 is blown, the controller C closes the shut-off valve 7 to stop the combustion of the gas burner B.

[Other Embodiments] (1) In the above embodiment, an example in which the gas burner B is constituted by three plate-shaped burners 18 has been described, but the number of plate burners 18 constituting the gas burner B does not matter. The gas burner B is not limited to a gas instantaneous water heater, but may be used for various combustion devices such as a gas stove. Can be applied.

(2) In the above embodiment, in the two thermocouples 17a and 17b for detecting the combustion flame temperature, the electromotive force of both thermocouples 17a and 17b is compared, and the difference between the two electromotive forces indicates the abnormality detection value. If it exceeds, the example in which it is determined that the gas burner B has caused the combustion abnormality has been described, but the thermocouples 17a and 17b
Without comparing the electromotive force of each, it is separately compared with a preset abnormality detection value, and if either one of the electromotive forces exceeds the abnormality detection value, it can be determined that a combustion abnormality has occurred, Further, as an example of the combustion flame temperature detecting means, a thermocouple as described above is shown. However, the present invention is not particularly limited to the thermocouple. Similarly, the combustion chamber temperature detecting means is not particularly limited to the thermocouple. Absent.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a gas instantaneous water heater.

FIG. 2 is an exploded perspective view of a gas burner.

FIG. 3 is an enlarged plan view and an enlarged front view of a plate-shaped burner.

FIG. 4 is a control block diagram.

FIG. 5 is a diagram showing an electromotive force generation state;

[Description of Signs] 1 cylinder body 2 heat exchanger 17a, 17b combustion flame temperature detecting means 18 burner 19a, 19b mixed gas supply section 20a, 20b mixed gas flow path 21 flame hole array C abnormality detecting means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigenobu Okuda 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Inventor Takahiko Hyodo 1-1-1, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka No. 52 Harman Co., Ltd. (72) Inventor Mitsuo Sawada 1-1-1 Oka, Minami-ku, Minato-ku, Osaka-shi, Osaka F-term (reference) 3K003 SA01 SB07 SC04 SC08 TA01 TB03 TB07 3K017 AA02 AB02 AB10 AC02

Claims (3)

[Claims] 1. A burner provided with a mixed gas supply section for supplying a mixed gas at both ends in a direction in which the burner rows are arranged in a mixture flow passage communicating with the burner rows, and a temperature of a combustion flame of the burner. A combustion flame temperature detection means for detecting the combustion flame temperature detection means for detecting a combustion abnormality of the burner based on the detection information of the combustion flame temperature detection means. An abnormality detection device for a combustion device, wherein combustion flame temperature detection means is provided on both sides of the center of the flame hole row in the longitudinal direction. 2. The method according to claim 1, wherein the abnormality detection means compares the detection values of the combustion flame temperature detection means, and if a difference between the two detection values exceeds an abnormality detection value for a burner, the burner has a combustion abnormality. The abnormality detection device for a combustion device according to claim 1, wherein the abnormality detection device is configured to determine the abnormality. 3. A heat exchanger for hot water supply is provided on an upper part of a cylinder body forming a combustion chamber of the burner; a combustion chamber temperature detecting means for detecting an ambient temperature in the combustion chamber is provided; 3. The device according to claim 1, wherein the means is configured to determine that the burner has a combustion abnormality when a detection value of the combustion chamber temperature detection means exceeds a combustion chamber abnormality detection value. Combustion device abnormality detection device.