JPH04281107A - Combustion controller - Google Patents

Abstract

PURPOSE:To carry out combustion control that is appropriate all the time by controlling the state of the fuel based on the outputs of a first sensor that has sensitivity for light in the area of infrared light that includes the area of visible light coming from the combustion zone, and a second sensor that has sensitivity for the area of infrared light coming from the combustion zone. CONSTITUTION:In a combustion controller which is suitable for a coolant heating type gas air conditioner, etc., and in which the mixture gas in a mixing section 5 into which the air is introduced through an air flow rate control section 7 and the combustion gas through a gas flow rate control section 9 is supplied to the main body 3 of a gas burner, a sensor SNa that has sensitivity also for visible light area from 1.2mum to 0.5mum and a sensor SNb that has sensitivity for the area of infrared light over 1.2mum are respectively arranged on the side wall of the main body 3 of the gas burner and the signals of those sensors are inputted to a calculation control section 21. And the signal after the amplification of the output signals of the sensor SNa and the output signal of the sensor SNb are compared with each other, and from their deviation, only the signals related to the combustion of burned objects are extracted, and based on those signals respective flow rate control sections 7, 11 are controlled.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device used for controlling gas combustion in air conditioners such as refrigerant-heated gas air conditioners.

0003

2. Description of the Related Art In recent years, various devices have been proposed that perform air conditioning by heating a refrigerant by burning gas.

[0004] In such a conventional device, air and gas are mixed and combusted, a sensor detects the infrared rays emitted from the flame caused by the combustion of these combustible materials, and the air and gas are mixed according to the detection result. The flow rate and other factors are controlled.

[0005] As described above, an apparatus that controls the flow rate of each combustion gas in accordance with the detection information from the sensor has the advantage that the detection characteristics of the sensor do not fluctuate because the sensor is not present in the flame.

[0006] Also, CO2 generated during combustion of combustion gas
Resonant light emission or infrared rays emitted from a flame at a temperature of several thousand degrees Celsius has a large amount of energy and exhibits characteristics that depend on the combustion state of the combustion gas, so it is effective as a detection target for controlling the combustion mentioned above. be.

[0007]

[Problems to be Solved by the Invention] However, combustion control devices used particularly in air conditioning equipment are provided with a metal electrode for ignition, and after ignition, there is a problem that the metal electrode is present in the flame during combustion. Therefore, the metal electrode is heated,
The infrared rays emitted from this red-hot metal electrode are superimposed on the infrared rays from the flame, making it difficult to accurately determine the exact combustion state of the combustion gas.

[0008] Furthermore, since it takes a long time for the metal electrode to become red hot after heating is started, information with a slow response from the metal electrode is input to the sensor.

[0009] Therefore, transient changes in the combustion state cannot be detected, and there is a risk that information different from the actual combustion state of the combustion gas may be output.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a combustion control device that can accurately detect the state of combustion of combustion gas and appropriately control combustion. do.

[Configuration of the invention]

0012

[Means for Solving the Problems] To achieve the above object, the present invention includes a first detection means sensitive to light in the infrared region including the visible light region emitted from the combustion region; It has a second detection means that is sensitive to the emitted infrared region, and a control means that controls the combustion state in the combustion region based on information detected by the first detection means and the second detection means. The gist is that.

[0013]

[Operation] The present invention provides a first detection means for detecting infrared rays emitted from a combustion region where a combustible material is burned, and a second detection means for detecting infrared rays including a visible light range emitted from the combustion region. has. Here, the light emitted from non-combustible materials in the flame ranges from visible light to infrared light,
The output of visible light emitted from a flame is much smaller than that of infrared light. Therefore, by removing the information detected by the second detection means from the information detected by the first detection means, it is possible to extract information regarding the combustion of a plurality of types of combustible materials. Based on the extracted information regarding the combustion of the plurality of types of combustion materials, the flow rate of each combustion material is controlled.

[0014] Therefore, the combustion state of the combustion gas can be accurately detected and combustion-related control can be performed appropriately.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of a combustion control device 1 according to the present invention will be explained with reference to FIG.

The combustion control device 1 has a gas burner main body 3 and a mixing section 5. Air is supplied to the mixing unit 5 via an air flow rate control unit (hereinafter simply referred to as a flow rate control unit) 7. Further, the introduction pipe 9 is provided with a gas flow rate control unit (hereinafter simply referred to as a flow rate control unit) 11, and the combustion gas whose flow rate is controlled by the flow rate control unit 11 is supplied to the introduction pipe 9.
It is supplied to the mixing section 5 via. The mixing section 5 mixes the air supplied via the flow rate control section 7 and the combustion gas supplied via the flow rate control section 11, and supplies this mixed gas to the gas burner body 3.

The ignition high voltage generating section (hereinafter simply referred to as the high voltage generating section) 13 includes a high voltage generator and the like, and generates a predetermined high voltage. A spark plug 15 is arranged within the gas burner body 3 at a predetermined height from the floor surface. This spark plug 15 has a pair of electrodes, and is discharged by the high voltage from the high voltage generator 13. A plurality of holes 17 arranged in a row are formed on the floor surface of the gas burner main body 3, and the mixed gas supplied from the plurality of holes 17 via the flow rate control section 7 and the flow rate control section 11 is ignited. It is ignited by plug 15. As a result, the mixed gas is ignited and a flame 19 is generated above the hole 17.

Sensors SNa and SNb are arranged on the side wall of the gas burner body 3 to monitor the combustion state of the combustion region where the mixed gas is combusted. Specifically, the sensor SNa is a phototransistor or photodiode made of silicon, for example, and has a diameter of 1.2 μm or less and 0.5 μm.
This is the first detection means that is sensitive mainly to the visible light region. Sensor SNb is thermopile 1 with silicon window
．． The second detection means is sensitive to an infrared region of 2 μm or more. The output signals of the sensors SNa and SNb are output to the connected arithmetic control section 21.

This calculation control unit 21 subtracts the information detected by the sensor SNb, which is the second detection means, from the information detected by the sensor SNa, which is the first detection means, and determines the combustion of a plurality of types of combustibles. It has a control means for controlling the flow rate of each combustible material based on information related to combustion of a plurality of types of combustible materials extracted from such information.

Next, the internal configuration of the calculation control section 21 will be explained with reference to FIG.

The amplifier 23 is connected to the sensor SNa and also to one input terminal of the operational amplifier 25. The other input terminal of the operational amplifier 25 is connected to the sensor S.
Connected to Nb. This operational amplifier 25 is the sensor S
The information detected by the sensor SNb is subtracted from the information detected by Na to extract information related to the combustion of multiple types of combustibles. The operational amplifier 25 is connected to the control circuit 27 and outputs the extracted information regarding the combustion of the plurality of types of combustibles to the control circuit 27. The control circuit 27 is connected to the flow rate control units 7 and 11, and controls the flow rate control units 7 and 11 based on information related to combustion of the combustible material. This adjusts the flow rate of air and gas.

Next, the operation will be explained with reference to FIGS. 3 to 6.

When the mixed gas discharged from the plurality of holes 17 is ignited by the spark plug 15, a flame 19 is generated above the holes 17 from which the mixed gas is discharged. Visible light and infrared rays are emitted from the flame 19 and the spark plug 15 which is heated by the flame 19 and becomes red hot.

FIG. 3 shows the relative intensity of infrared or visible light emitted from the flame 19 and red-hot spark plug 15 with respect to wavelength. Specifically, the curve a portion in FIG. 3 is a radiation characteristic curve of visible light and infrared rays from the flame 19, and shows a CO2 resonance radiation component. The curve b portion in FIG. 3 is a radiation characteristic curve of visible light and infrared rays from the flame 19, and shows the radiation component due to heat. Also,
The curve c portion in FIG. 3 is a radiation characteristic curve of visible light and infrared rays from the red-hot metal of the red-hot spark plug 15, and indicates an infrared region component. The curve d portion in FIG. 3 is a radiation characteristic curve of visible light and infrared rays from the red-hot metal of the red-hot spark plug 15, and shows visible light range components. (Visible light and infrared rays emitted from these flames 19 and the red-hot spark plug 15 are detected by sensors SNa and SNb, respectively.)
As is clear from FIG. 3, the light (electromagnetic waves) emitted from the red-hot metal of the spark plug 15 in the flame 19 ranges from visible light to infrared light. On the other hand, flame 19
The light (electromagnetic waves) emitted has a strong spectral distribution in the infrared region, and the emission intensity is very weak in the visible light region. Therefore, it is very important to detect the emission characteristics in the visible light range in order to know the red-hot state of the red-hot metal of the spark plug 15.

That is, the ratio of the integrated value of the spectral intensity in the visible light region of the spark plug 15 to the integrated value of the spectral intensity in the infrared region is proportional to the emission intensity of the spark plug 15, and By multiplying the highly sensitive sensor SNa output by the ratio, it can be processed as substantially the light emission intensity in the infrared region from the time of ignition of the spark plug 15.

Therefore, in this embodiment, first, the signal detected by the sensor SNa shown in FIG. The detected signal is applied to the other input terminal of the operational amplifier 25. Furthermore, the operational amplifier 25 compares both signals input to the input terminal,
By removing the signal detected by the sensor SNa from the signal detected by the sensor SNb, only the signal related to the combustion of the combustible material as shown in FIG. 6 is extracted. Further, when the control circuit 27 receives a signal related to the combustion of the combustible material from the operational amplifier 25, it controls the flow rate controllers 7 and 11 in accordance with the signal related to the combustion of the combustible material. This adjusts the flow rate of air and gas. Thereby, it is possible to appropriately control the combustion of the combustible material.

[0028]

As described above, according to the present invention, the combustion of a plurality of types of combustible materials is detected based on the information detected by the first detection means and the information detected by the second detection means. Since the configuration is configured to extract information related to this, it is possible to accurately detect the state of combustion of the combustion gas and appropriately control the combustion.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment according to the present invention.

FIG. 2 is an internal configuration diagram of the arithmetic control section shown in FIG. 1.

FIG. 3 is a radiation characteristic curve diagram showing the relative intensity of infrared rays and visible rays emitted from a flame and a red-hot spark plug with respect to wavelength.

FIG. 4 is an output signal diagram of sensor SNb.

FIG. 5 is an output signal diagram of sensor SNa.

FIG. 6 is an output signal diagram of an operational amplifier.

[Explanation of symbols]

15 Spark plug 21 Arithmetic control section 25 Operational amplifier 27 Control circuit SNa sensor SNb sensor

Claims (1)

[Claims] 1. A first detection means that is sensitive to light in the infrared region including the visible light region emitted from the combustion region; and a second detection means that is sensitive to the infrared region emitted from the combustion region. A combustion control device comprising: a control means for controlling a combustion state in the combustion region based on information detected by the first detection means and the second detection means.