JP3075810B2 - Combustor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a combustor for heating or supplying hot water by burning gas or oil.

[0002]

2. Description of the Related Art Conventionally, in a combustion device using water as a heat medium as a control device of a combustion machine, when the combustion is not performed, heat generated due to a decrease in temperature of an environment in which the device is placed (mostly outside). The possibility of freezing in exchangers or piping systems has arisen.

In order to prevent this freezing, generally, a temperature near the heat medium is detected as a means for preventing freezing, and when the temperature falls below a temperature at which freezing is possible, a freezing preventing method different from the original operation mode is used. It is common to enter an operation mode and perform intermittent combustion or operate a medium circulation pump.

[0004]

However, in such an antifreezing operation mode, the operation state is always the same mode below the antifreezing operation mode start set temperature Tf regardless of the actual medium temperature as shown in FIG. (In the figure, the antifreeze operation has a combustion time of 3 minutes and a stop time of 1 minute.
(0 min), there is a risk of consuming more energy than necessary for the antifreeze operation, or not being able to follow the decrease in the medium temperature and causing local freezing in the piping system.

The present invention has been made in view of the above circumstances, and has as its object to provide a control device for a combustor which solves the above-mentioned problems by changing the operation mode of the anti-freezing operation according to the temperature near the medium. is there.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a combustion device,
In a combustor provided with a heat exchanger for exchanging heat between combustion gas and water of the combustion device, the heat exchanger is disposed near the heat exchanger.
A temperature sensor for detecting the ambient temperature of the location to location,
Depending on the temperature detected by this temperature sensor , the combustion time and stop time
Any one of a plurality of antifreeze operation modes having different intervals is selected, and the fuel
Anti-freezing means for operating the baking device in an intermittent combustion operation stepwise .

[0007]

As described above, the temperature sensor placed at the most liable point of the combustor detects the temperature, and performs, for example, intermittent combustion operation at a temperature lower than the freezing prevention operation start temperature. In other words, as the temperature decreases, a higher amount of heat is given to the medium to increase the antifreezing ability.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings of the embodiments.

FIG. 1 shows a combustion apparatus serving as a gas combustor for hot water heating. Reference numeral 1 denotes a combustion apparatus having a gas combustion section 2 disposed below. Is wound, and a temperature sensor 4 having a temperature-sensitive element is disposed near the freezing point 3a, and an output of the temperature sensor 4 is guided to a freezing prevention means 5 serving as a control circuit.
The control signal output from the anti-freezing means 5 is transmitted to the combustion device 1
Of the gas combustion unit 2 and a circulation pump 7 of the heat exchanger 3.

Next, this operation will be described. A pipe outlet position where the pipe is easily exposed to the outside air of the pipe-shaped heat exchanger 3 of the combustion device 1 which becomes a water (medium) circuit, for example, which is likely to freeze in the combustor, A temperature sensor 4 disposed in the vicinity of the heat exchanger 3 detects an ambient temperature at a location 3a where the temperature tends to freeze.

In this case, the freezing prevention start temperature is detected at a plurality of stages such as Tf, Tf1, Tf2, etc. as shown in FIG. Try to change the mode. That is, when the value of the anti-freezing start temperature Tf is attained, the operation mode is set.
A control signal is issued from the anti-freezing means 5 so as to perform the intermittent combustion operation for a short time. When the freeze prevention start temperature Tf1 is at the value, the operation mode is set. At this time, the antifreezing operation is a combustion time of 3 minutes, and an intermittent combustion operation is performed for a stop time of 20 minutes. When the antifreezing start temperature Tf2 is at the value, the operation mode is set to an operation mode. 10 minutes. As described above, the stepwise intermittent combustion operation according to the degree of risk of freezing is performed, so that unnecessary energy consumption is suppressed.

[0012]

As described above, the control device of the combustor of the present invention detects the ambient temperature of the portion of the heat exchanger to be protected from freezing, and changes the freezing operation mode according to the detected temperature. It is possible to suppress unnecessary energy consumption for the preventive operation and prevent local freezing in the piping system.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a control device of a combustor showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the freeze prevention operation mode.

FIG. 3 is an explanatory diagram of a conventional anti-freezing operation mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion device 3 Heat exchanger 4 Temperature sensor 5 Freezing prevention means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/02 350 F24H 1/10 303 F23N 5/24

Claims (1)

(57) [Claims] 1. A combustor comprising a combustion device and a heat exchanger for exchanging heat between combustion gas and water of the combustion device, wherein the combustion device is disposed near the heat exchanger to reduce an ambient temperature of the portion. a temperature sensor for detecting, in accordance with the detected temperature of the temperature sensor, the combustion time and select one of the plurality of freeze prevention operation mode having different stopping time, the combustion based on the freeze prevention operation mode selected A control device for a combustor, comprising: an anti-freezing means for causing a stepwise intermittent combustion operation of the device.