JP2590271Y2 - Combustion equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a combustion device for an indoor water heater, and more particularly to a combustion device provided with an exhaust gas sampling port in an exhaust passage and a means for preventing water condensation in a branch exhaust gas line. It concerns the device.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view of a general gas-fired water heater. This type of water heater 1 supplies a combustion chamber 3 including a gas burner 2, and supplies and exhausts the combustion chamber 3. It has a combustion fan 11, a heat exchanger 5, an exhaust stack 4, a CO sensor 8 for detecting the concentration of carbon monoxide gas in exhaust gas, and a control device (not shown) for controlling combustion operation. ing. The control device controls operations such as water supply, combustion, and hot water supply, and controls supply of hot water to a desired location such as a kitchen, a bathroom, or a wash basin.

[0003] In this type of gas-fired water heater installed indoors, carbon monoxide in the exhaust gas has increased abnormally due to improper installation of the equipment, etc., and this has leaked indoors. There is fear and it is regarded as a problem. For this reason, a method has recently been adopted in which a detection sensor (CO sensor 8) for detecting the concentration of carbon monoxide is provided in the exhaust passage 4 of the combustion device, and the concentration of carbon monoxide is measured by the CO sensor 8 to detect an abnormality. I have.

[0004] However, this type of CO sensor not only changes the concentration of carbon monoxide gas but also changes the temperature of the exhaust gas, so that the output characteristics of the sensor greatly change. There is a problem that the function of the above cannot be sufficiently exhibited. That is, the exhaust gas temperature of this type of combustion device becomes high as 200 ° C. or more, and the exhaust gas temperature fluctuates widely depending on the type of water heater and the type of gas, depending on, for example, the amount of hot water used. In the case where a capacity switching system capable of switching the gas amount continuously or in several stages is provided, when the minimum and maximum gas amounts are burned, a large difference occurs in the temperature of the exhaust gas generated thereby. Therefore, it is conceivable to take measures to cool the temperature of the exhaust gas to around normal temperature.

[0005]

However, the method of cooling the exhaust gas involves, for example, setting the temperature of the exhaust gas to around normal temperature,
For example, if the temperature is lowered below 50 ° C, the exhaust gas pipe and CO
Moisture condensation occurs in the sensor, and the function of the CO sensor is not sufficiently exhibited, and the output of the sensor varies. Therefore, the abnormal concentration of carbon monoxide gas may not be accurately detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to prevent the occurrence of moisture condensation even when the temperature of exhaust gas is lowered, and to reduce the concentration of carbon monoxide gas. Is to provide a combustion device capable of performing safe combustion by accurately detecting the combustion.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. That is, the first invention of the present application is that a combustion chamber is provided with a burner and a heat exchanger heated by the burner, and an exhaust gas sampling port is provided in an exhaust-side passage of exhaust gas from an exhaust outlet side of the combustion chamber. Forming a branch pipe for diverting the exhaust gas from the exhaust-side passage, and providing a CO sensor for detecting the concentration of carbon monoxide gas or an O ₂ sensor for detecting the oxygen concentration in the path of the branch pipe; The branch pipe is led out from the exhaust outlet side of the combustion chamber through the area of the heat exchanger and the burner combustion section, and passes through the heat exchanger and the burner combustion section of the exhaust gas flowing through the branch pipe. It is characterized in that it is also used as a heating means for preventing moisture condensation. The second invention of the present application, the heat exchanger is provided which is heated by the burner and the burner combustion chamber, the exhaust side passage of the exhaust gas exiting the combustion chamber exhaust outlet of the downstream side of the heat exchanger An exhaust gas sampling port is provided to form a shunt line for shunting the exhaust gas from the exhaust-side passage, and a CO sensor or an oxygen concentration for detecting the concentration of the carbon monoxide gas of the exhaust gas in the shunt line path. In addition to providing an O ₂ sensor for detection, the branch pipe is led out from the exhaust outlet side of the combustion chamber through the area of the heat exchanger and the burner combustion section. It also serves as a heating means for preventing moisture condensation of the exhaust gas flowing through the pipe, and the outlet side of the branch pipe is arranged facing the air supply port of the combustion fan that supplies air to the burner combustion section. It is configured as a feature.

[0008]

When the combustion device is burning, the exhaust gas flows through the sampling port to the shunt line, at which time the concentration of carbon monoxide gas is measured by, for example, a CO sensor provided in the shunt line. Is detected. Exhaust gas flowing into the branch pipe is cooled from the surroundings and its temperature is lowered, but the dew condensation is prevented by heating by the heating means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the description of this embodiment, the same parts as those of the conventional example are denoted by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 1 is a schematic view of a water heater according to one embodiment of the present invention. A main component of the water heater 1 of the present embodiment is an exhaust gas having an exhaust gas sampling port 12 in an exhaust side passage.
And a CO sensor 8 for detecting the concentration of carbon monoxide gas in the middle of the pipe 6.

The exhaust side passage is an exhaust passage for exhaust gas exiting from the exhaust outlet side of the combustion chamber 3, and a pipe 6 is a passage for diverting the exhaust gas from the exhaust side passage. The combustion fan passes through the vicinity (region) of the exchanger 5 and further passes through the vicinity (region) of the gas burner combustion section 9.
It is connected to 11 inlets 10.

[0012] The burner combustion section 9 is supplied and discharged from a combustion fan 11.
Air is supplied, and the burner fuel
The air supply passage to the baking section 9 functions as an air supply passage.
Of the pipe 6 facing the intake port 10 forming a part of the air supply passage
The outlet side is connected and arranged.

In this embodiment, the heat exchanger 5 and the gas burner combustion section function as means for heating the exhaust gas passing through the pipe 6. The exhaust gas collected from the sampling port 12 flows in the direction of arrow 13 by the exhaust pressure of the combustion chamber and the negative pressure of the suction port 10 of the combustion fan 11 so that the CO sensor 8 can detect the concentration of carbon monoxide in the exhaust gas. Is configured. Also C
The O sensor 8 is provided in the chamber 7.

[0014] exhaust gas taken at the exhaust side passage in the embodiment of the present invention the length flows through the bypass duct 6 in the direction of arrow 13
Then , it flows to the intake port 10 via the CO sensor 8 and the burner combustion section 9. The exhaust gas collected at this time absorbs heat in the upper portion 6 'of the heat exchanger 5 and further absorbs heat in the burner combustion section 9, and the output characteristic of the CO sensor 8 is unstable due to the temperature of the exhaust gas in the pipe 6. The temperature is maintained at about 60 ° C. to 100 ° C. to prevent water condensation on the pipe 6 and the CO sensor.

As described above, the temperature of the exhaust gas is measured by the CO sensor 8.
By keeping the temperature at an appropriate level that does not cause instability and dew condensation, the function of detecting the concentration of carbon monoxide gas in the CO sensor is perfect, and the concentration of carbon monoxide in the exhaust gas Is accurately detected to ensure safe combustion operation.

Further, according to this embodiment, since the heat exchanger 5 of the water heater and the burner combustion section 9 also serve as the heating means for the pipe 6, it is necessary to provide a separate and independent heating means for heating the pipe 6. Therefore, simplification of the device configuration and drastic reduction of the device cost can be achieved.

The present invention is not limited to the above embodiment, but can take various embodiments. For example, in the above embodiment, the CO sensor 8 is provided in the chamber 7 of the pipe 6, but an O ₂ sensor for detecting the oxygen concentration in the exhaust gas may be provided instead of the CO sensor 8. In this case, safe combustion operation of the combustion device is performed in the same manner as in the case of the CO sensor using the oxygen detection concentration of the O ₂ sensor.

Further, in the above-described embodiment, the heat absorption by the heat exchanger or the heat absorption in the gas burner combustion section 9 has been described as the heating means of the gas branch pipe (pipe 6). However, for example, the pipe 6 is heated by a heater. You may. Further pipe 6
May be protected by a heat insulating material to reduce the cooling effect. Furthermore, without connecting the outlet of the pipe 6 to the inlet of the fan 11,
You may make it discharge | emit outdoors.

Further, in the above embodiment, the combustion apparatus has been described by taking a gas-fired water heater as an example, but the present invention is also applicable to an oil-fired combustion apparatus.

[0020]

According to the present invention, an exhaust gas sampling port is provided in an exhaust-side passage of exhaust gas emitted from an exhaust outlet side of a combustion chamber to form a branch pipe for dividing exhaust gas from the exhaust-side passage. Is provided with a CO sensor (or an O ₂ sensor), so that high-temperature exhaust gas flowing out from the exhaust outlet side of the combustion chamber can be removed by diverting the exhaust gas from the exhaust-side passage to the branch pipe. The temperature at which the output characteristic of the sensor (or O ₂ sensor) is stabilized, that is, the CO sensor (or O ₂ sensor)
₂ sensor) can be cooled to a temperature where the performance can be sufficiently exhibited, and furthermore, a heating means is provided in this diverting pipe to constitute a means for preventing dew condensation, so that the exhaust gas diverted to the diverting pipe is It is possible to prevent water condensation due to excessive cooling, the CO sensor is not adversely affected by the water condensation, the carbon monoxide gas concentration (or oxygen concentration) is accurately detected, and the combustion device is safe. Can be driven. Then, the shunt conduit, derived via the region of the heat exchanger and the burner combustion section, since a configuration in which also serves as a heat exchanger and the burner combustion section as a heating means, a heating exclusive of heating the shunt conduit There is no need to provide any means,
The apparatus configuration can be simplified and the apparatus cost can be significantly reduced.

Further, a combustion fan is provided at the outlet side of the branch pipe.
The exhaust pressure from the combustion chamber side is applied to the inlet side of the branch pipe and the negative pressure from the inlet port of the combustion fan to the outlet side of the branch pipe. since the suction force <br/> is applied becomes the flow of exhaust gas diverted to the shunt conduit is promoted, thereby, more changes in CO concentration in the exhaust gas exiting the combustion chamber (or O ₂ concentration) It is possible to detect quickly (with good response) and increase the reliability of CO safety .

[Brief description of the drawings]

FIG. 1 is a schematic view of a mechanical structure of a water heater constituting one embodiment of the present invention.

FIG. 2 is a schematic diagram of a mechanical structure of a conventional water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-water supply device 2 Gas burner 3 Combustion chamber 5 Heat exchanger 6 Exhaust gas branch line 8 CO sensor 12 Exhaust gas sampling port

Claims (2)

(57) [Scope of request for utility model registration] A combustion chamber is provided with a burner and a heat exchanger heated by the burner, and an exhaust gas sampling port is provided in an exhaust passage of an exhaust gas from an exhaust outlet side of the combustion chamber to exhaust the exhaust gas. A branch line is formed for branching from the side passage, and a CO sensor for detecting the concentration of carbon monoxide gas in the exhaust gas or an oxygen sensor for detecting the oxygen concentration is formed in the branch line.
_While providing _two sensors, the branch pipe is led out from the exhaust outlet side of the combustion chamber through the area of the heat exchanger and the burner combustion section, and the heat exchanger and the burner combustion section are connected to the branch pipe. A combustion device which is also used as a heating means for preventing moisture dew from flowing exhaust gas. 2. A combustion chamber is provided with a burner and a heat exchanger heated by the burner, and an exhaust gas sampling port is provided in an exhaust passage of exhaust gas from a combustion chamber exhaust outlet downstream of the heat exchanger. A CO 2 sensor for detecting the concentration of carbon monoxide gas in the exhaust gas or an O ₂ sensor for detecting the concentration of oxygen in the flow path of the exhaust gas. In addition to the above, the branch pipe is led out from the combustion chamber exhaust outlet side through the area of the heat exchanger and the burner combustion section, and the exhaust pipe flowing through the branch pipe through the heat exchanger and the burner combustion section. A combustion device, which also serves as a heating means for preventing moisture dew condensation of a gas, wherein an outlet side of a branch pipe is arranged facing an air supply port of a combustion fan for supplying air to a burner combustion section.