JP2006275364A - Cookstove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cookstove capable of accurately and quickly detecting whether flames are correctly formed by a burner for heating a heated object or not while keeping good cleaning performance and appearance. <P>SOLUTION: This cookstove comprising the burner 30 for heating the heated object N and a flame detecting means 21 for detecting the flames F formed by the burner 30, further comprises an infrared ray intensity measuring means 40 for measuring the intensity of infrared ray radiated from the flames F formed by the burner 30, and the flame detecting means 21 is constituted to detect the flames on the basis of the intensity of the infrared ray measured by the infrared ray intensity measuring means 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stove including a burner that heats an object to be heated and flame detection means that detects a flame formed by the burner.

In a stove equipped with a burner that heats an object to be heated such as a pan placed above the top plate as described above, by providing a flame detection means for detecting a flame formed by the burner, the burner is ignited. It is possible to detect whether or not the flame is formed correctly during operation, for example, if the flame is not formed correctly, the gas supply to the burner is shut off because of poor ignition or extinction, etc. It is possible to control the operation of the burner.
As a conventional stove capable of detecting a flame in this way, a thermocouple installed in a form exposed to the flame formed by the burner is installed, and the flame is detected based on the electromotive force of the thermocouple. A configured stove is known (see, for example, Patent Document 1).

JP 2004-144424 A

  In the conventional stove described in the above-mentioned Patent Document 1, it is necessary to install a thermocouple for detecting a flame in a form exposed to a burner. There were problems such as defects, deterioration in cleanability and aesthetics.

  In addition, since the thermocouple as described above has a slight heat capacity, the response is relatively poor, so even when a flame is not formed correctly due to poor ignition or extinction, it is possible to detect it quickly. There was a problem that I could not.

  In view of the above circumstances, the present invention is capable of accurately and quickly detecting whether or not a flame is correctly formed by a burner that heats an object to be heated while making the cleaning property and aesthetics excellent. Is to provide

In order to achieve the above object, a stove according to the present invention is a stove including a burner that heats an object to be heated, and a flame detection means that detects a flame formed by the burner. Comprises infrared intensity measuring means for measuring the infrared intensity of infrared rays emitted from the flame formed by the burner,
The flame detection means is configured to detect the flame based on the infrared intensity measured by the infrared intensity measurement means.

According to the said 1st characteristic structure, in the stove which heats a to-be-heated object, such as a pan placed above the top plate, directly by the flame formed by the burner, it is formed near the bottom of the to-be-heated object. Since infrared rays are radiated from the flame, the infrared intensity of the infrared rays emitted from the flame is measured by the infrared intensity measuring means, and the flame is measured based on the measured infrared intensity by the flame detecting means. Can be detected.
And since such infrared intensity measuring means can be installed in a non-contact manner with respect to the flame, it is possible to prevent malfunction due to excessive temperature rise and filth adhesion. It can be installed on the lower side of the top plate or the like without protruding from the formed portion, and can be made excellent in cleanability and aesthetics.
In addition, the infrared intensity measured by the infrared intensity measuring means changes rapidly following the presence or absence of a flame. This can be detected quickly by the detection means, and the burner operation control such as shutting off the supply of gas to the burner can be performed.
Therefore, according to the present invention, it is possible to accurately and quickly detect whether or not a flame is correctly formed by a burner that heats an object to be heated placed above the top plate, while having excellent cleanability and aesthetics. A stove that can be realized.

The stove according to the second aspect of the present invention has a second feature configuration in which, in addition to the first feature configuration, the infrared intensity measuring means is for deriving a plurality of different temperatures within the wavelength range of infrared rays emitted from the object to be heated. Configured to measure the infrared intensity for each wavelength region,
A temperature deriving unit is provided for obtaining the temperature of the object to be heated based on the relationship of the infrared intensity for each of the plurality of temperature deriving wavelength ranges measured by the infrared intensity measuring unit.

According to the second characteristic configuration, the temperature deriving unit is configured to determine the infrared intensity for each of a plurality of different temperature deriving wavelength ranges within the wavelength range of the infrared rays emitted from the object to be heated. In obtaining the temperature of the object to be heated without depending on the difference in emissivity of the heated object, the infrared intensity measuring means for measuring the infrared intensity for each of the plurality of temperature deriving wavelength ranges is the flame detecting means described above. The infrared intensity measuring means for measuring the infrared intensity for detecting the flame by means of can be used in common, and both the flame detection and the temperature of the heated object can be rationally performed.
Further, the temperature deriving wavelength range is set to a wavelength range where there is no radiation from the flame or the radiation intensity is weak, so that the temperature of the object to be heated is accurately controlled in a form in which the influence of the flame is suppressed by the temperature deriving means. Can be requested.

In the third feature configuration of the stove according to the present invention, in addition to the second feature configuration, the infrared intensity measurement means has an infrared intensity for at least one of the temperature deriving wavelength ranges, and the radiation intensity from the flame is Measure the infrared intensity for the weak flame influence wavelength range,
The flame detection means is configured to detect the flame based on an infrared intensity for the flame influence wavelength region.

  According to the third characteristic configuration, in the case of performing both the flame detection by the flame detection unit and the heating object temperature derivation by the temperature measurement unit using the infrared intensity measured by the infrared intensity measurement unit. The infrared intensity measurement means measures the infrared intensity within the wavelength range of the infrared radiation emitted from the object to be heated and has a weak radiation intensity from the flame. The infrared intensity can be used as at least one of the infrared intensities for each of a plurality of temperature deriving wavelength ranges for deriving the temperature by the temperature deriving means, and as the infrared intensity for detecting the flame by the flame detecting means. Therefore, the number of infrared intensities in a plurality of different wavelength ranges to be measured by the infrared intensity measuring means can be reduced to improve the responsiveness and simplify the apparatus configuration.

According to a fourth characteristic configuration of the stove according to the present invention, in addition to the second characteristic configuration, the infrared intensity measuring means is radiated from the flame separately from the infrared intensity for each of the plurality of temperature deriving wavelength ranges. Measure the infrared intensity for the flame detection wavelength range within the infrared wavelength range,
The flame detection means is configured to detect the flame based on the infrared intensity for the flame detection wavelength region.

  According to the fourth characteristic configuration, the flame by the flame detecting means is separated from the infrared intensity for each of a plurality of temperature deriving wavelength ranges for deriving the temperature of the object to be heated by the temperature measuring means by the infrared intensity measuring means. By measuring the infrared intensity for the flame detection wavelength range for detection, the plurality of temperature derivation wavelength ranges are set to wavelength ranges where there is almost no radiation intensity from the flame, and the temperature derivation means sets the flame. Thus, the temperature of the object to be heated can be obtained with extremely high accuracy in a form that eliminates the influence of.

  A fifth feature configuration of the stove according to the present invention includes, in addition to any of the second to fourth feature configurations described above, the infrared intensity measurement unit includes a single measurement unit that measures infrared intensity, and the measurement unit. It is in the point comprised by the switching part which switches the wavelength range of the infrared rays which enter.

According to the fifth feature configuration, in the infrared intensity measuring means, the infrared intensity for each of a plurality of wavelength ranges is changed to the single measurement by switching the wavelength range of the infrared ray incident on the measurement unit by the switching unit. It can comprise so that it may measure by a part, and an apparatus structure can be simplified.
That is, in the infrared intensity measuring means, the switching unit sequentially switches the wavelength range of infrared rays incident on the measuring unit to each temperature deriving wavelength range, and the single measuring unit derives a plurality of different temperatures. The infrared intensity for each wavelength range can be measured separately. Furthermore, as in the fourth feature configuration, when measuring the infrared intensity in a flame detection wavelength range different from the temperature derivation wavelength range, the switching unit causes the infrared rays incident on the measurement unit to be measured. By sequentially switching the wavelength range between the temperature deriving wavelength range and the flame detecting wavelength range, the infrared intensity for the temperature deriving wavelength range and the infrared intensity for the flame detecting wavelength range are determined by a single measuring unit. It can be measured separately.

[First Embodiment]
A stove according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the stove of the first embodiment can be placed with a flat top plate 1 having a circular heating port 1 a and a heated object N such as a pan separated from the heating port 1 a. Gotoku 2 as a mounting part, a burner 30 for heating an object to be heated N placed on the 5th virtue 2, an infrared ray that is installed at a lower position of Gotoku 2 and is emitted by a flame F formed by the burner 30 And an infrared intensity measuring device 40 (an example of infrared intensity measuring means) that receives infrared rays emitted from the bottom of the object N and measures the infrared intensity of the infrared rays, and a control device 20 that controls the operation of the burner. It is configured.
The control device 20, which will be described in detail later, is a flame detection unit 21 (an example of flame detection means) that detects a flame based on the measurement result of the infrared intensity measurement device 40, and is heated based on the measurement result. A temperature deriving unit 22 (an example of a temperature deriving unit) for obtaining the temperature of the object N, an operation control unit 23 for controlling the operation of the burner 30 based on the flame detection result of the flame detection unit 21 and the derived temperature of the temperature deriving unit 22 Composed.

Hereinafter, each part of the stove will be described.
First, the burner 30 will be described. The burner 30 is configured as a Bunsen combustion type internal flame type.
In other words, the internal flame type burner 30 is configured to eject the fuel gas G supplied through the fuel supply path 5, the fuel gas G is ejected from the gas nozzle 31, and the suction accompanying the ejection of the fuel gas G An annular inner flame which is provided with a mixing tube 32 to which primary combustion air A is supplied by action and a plurality of flame ports 33 for injecting the air-fuel mixture to the inner periphery, and to which the air-fuel mixture is supplied from the mixing tube The casing member 34 and the like are provided.
The burner 30 is provided below the heating port 1a.

  In the inner flame type burner 30, the mixture of the fuel gas G and the primary combustion air A supplied from the mixing pipe 32 into the inner flame casing member 34 is supplied from the flame port 33 to the inner flame casing member 34. The air-fuel mixture of the injected fuel gas G and the primary combustion air A is combusted in a substantially horizontal direction toward the center, and a flame F is formed upward through the heating port 1a.

The fuel supply path 5 is provided with a fuel supply intermittent valve 6 for intermittently supplying the fuel gas G to the gas nozzle 31 and a fuel supply amount adjusting valve 7 for adjusting the supply amount of the fuel gas G to the gas nozzle 31. is there.
A soup pan 8 is provided below the inner flame casing member 34 of the burner 30 for receiving boiled food that has fallen through the heating port 1a.

Furthermore, a plurality of notches 8a for forming the secondary air intake port 14 are formed at intervals in the juice receiving tray 8 along the upper edge portion thereof.
Then, the plurality of secondary air intake ports 14 are surrounded by a bottom surface of the inner flame casing member 34 and the plurality of cutouts 8a at locations where the burner 30 enters the lower part of the inner flame casing member 34. Formed at intervals along the direction.

Next, the infrared intensity measurement by the infrared intensity measuring device 40 and the temperature derivation of the heated object N by the temperature derivation unit 22 will be described.
The infrared intensity measuring device 40 is provided in the flow area of the secondary combustion air from one of the plurality of secondary air intakes 14 below the inner flame casing member 34 of the burner 30. The cover member 46 is provided in a state in which the cover member 46 faces obliquely upward with respect to the bottom of the article N to be heated.
The infrared intensity measuring device 40 is configured to measure the infrared intensity for each of two different temperature derivation wavelength ranges within the wavelength range of the infrared rays emitted from the heated object N.
In addition, the temperature deriving unit 22 is configured to detect the ratio of the infrared intensity for each of the two temperature deriving wavelength ranges detected by the infrared intensity measuring device 40 (the infrared intensity for each of the plurality of temperature deriving wavelength ranges). The temperature of the article N to be heated is determined based on the relationship, which may be hereinafter referred to as an infrared intensity ratio).

  The two temperature deriving wavelength ranges are set in a range where there is no radiation from the flame of the burner 30 or the radiation intensity is weak within the wavelength range of infrared rays radiated from the object N to be heated.

The infrared intensity measuring device 40 will be further described.
As shown in FIG. 2, the infrared intensity measuring device 40 includes two bandpass filters 41a and 41b having different wavelength ranges of infrared rays to be transmitted, and infrared infrared rays that have passed through the two bandpass filters 41a and 41b. Two infrared elements 42a and 42b that measure the intensity separately are configured to measure the infrared intensity for each of two different temperature derivation wavelength ranges in the infrared rays emitted from the heated object N. It is configured. Incidentally, the bandpass filters 41a and 41b are configured to selectively transmit only infrared rays in a predetermined temperature deriving wavelength region.

Further, the two infrared elements 42a and 42b are described so that the infrared intensity of the infrared rays incident through the opening 44 can be measured in the packaging 43 having the opening 44 for light incidence. Are arranged side by side, one band pass filter 41a is provided in a portion where the infrared ray is incident on one infrared element 42a in the opening 44, and a portion where the infrared ray is incident on the other infrared element 42b in the opening 44. The other band pass filter 41b is provided.
In the packaging 43, a drive unit 45 for driving the two infrared elements 42a and 42b is provided.
Further, a cover member 46 capable of transmitting infrared rays is provided so as to cover the entire surface of the two band-pass filters 41a and 41b, and the two band-pass filters 41a and 41b are formed by the cover member 46. Is configured to protect.

Hereinafter, how to set the two temperature deriving wavelength ranges will be described.
FIG. 3 shows the infrared radiation intensity spectrum distribution emitted from the flame formed by the actual burner 30. As shown in FIG. 3, in the infrared wavelength range, a range of 1.5 μm to 1.8 μm, a range of 2.0 μm to 2.4 μm, a range of 3.1 μm to 4.2 μm, In the range of 8.0 μm or more and 12.0 μm or less, there is no radiation from the flame or the radiation intensity is weak.
Therefore, the two temperature deriving wavelength ranges are in the range of 1.5 μm to 1.8 μm, in the range of 2.0 μm to 2.4 μm, in the range of 3.1 μm to 4.2 μm. And the temperature range for deriving the two temperatures within the wavelength range of infrared rays without the radiation from the flame of the burner 30 or the radiation intensity is set within the range of 8.0 μm or more and 12.0 μm or less. It can be set within a weak range.
For example, the two temperature deriving wavelength ranges are set to a wavelength range of 3.1 μm and a wavelength range of 3.9 μm within a range of 3.1 μm to 4.2 μm.

Hereinafter, the infrared elements 42a and 42b will be described.
Infrared elements 42a and 42b constructed using PbS (lead sulfide) or PbSe (lead selenide) as an infrared cell detect infrared rays in the range of 1.5 μm to 5.0 μm at an operating temperature of room temperature (300 K). Moreover, the sensitivity to infrared rays within the range of 3.1 μm or more and 4.2 μm or less is relatively high and the detection output is large.
Therefore, as described above, when the two temperature deriving wavelength ranges are set within the range of 3.1 μm or more and 4.2 μm or less, the infrared elements 42a and 42b are made of PbS (lead sulfide) or PbSe (selenide). Lead) is preferably used as the infrared cell.

Next, a temperature derivation process for obtaining the temperature of the object to be heated by the temperature derivation unit 22 will be described. In the following description, the two temperature deriving wavelength regions are denoted by λ1 and λ2. Incidentally, the temperature deriving wavelength region λ2 is longer than the temperature deriving wavelength region λ1.
FIG. 4 shows the relationship between the output value (corresponding to the infrared intensity) and the temperature of the object to be heated for each of the two temperature deriving wavelength ranges λ1 and λ2 in the infrared intensity measuring device 40 obtained in advance by experiments. . Incidentally, the relationship shown in FIG. 4 is obtained by using a heated object having an emissivity of 0.92.
FIG. 5 shows an output ratio (the ratio between the temperature of the object to be heated and the output value corresponding to the temperature deriving wavelength region λ2 and the output value corresponding to the temperature deriving wavelength region λ1 in the infrared intensity measuring device 40). (Corresponding to the infrared intensity ratio) (hereinafter, sometimes referred to as a relationship between temperature and infrared intensity ratio).

Incidentally, the relationship between temperature and infrared intensity ratio shown in FIG. 5 is obtained as follows.
That is, for each of a plurality of heated objects having different emissivities ε, the temperature of the heated object is changed to a plurality of temperatures, and the output ratio is obtained for each of the plurality of temperatures. Then, based on the data obtained for a plurality of objects to be heated with different emissivities ε, an approximate expression of the relationship between the temperature and the output ratio is obtained, and the obtained approximate expression is related to the relationship between the temperature and the infrared intensity ratio. It is as.
Therefore, the relationship between the temperature-to-infrared intensity ratios of the heated objects N having various emissivities ε can be made into a common temperature-to-infrared intensity ratio relationship.

  The relationship between the temperature and infrared intensity ratio as shown in FIG. 5 obtained as described above is stored in the storage unit (not shown) of the temperature deriving unit 22.

The temperature deriving unit 22 outputs an output ratio between the output value corresponding to the temperature deriving wavelength region λ2 and the output value corresponding to the temperature deriving wavelength region λ1 in the infrared intensity measuring device 40 (corresponding to the infrared intensity ratio). ) And the temperature of the object N to be heated is determined from the stored relationship between the temperature and infrared intensity ratio.
Therefore, the temperature of the object to be heated N can be accurately obtained without depending on the emissivity of the object to be heated N.

  The temperature obtained by the temperature deriving unit 22 is output to the operation control unit 23, which operates the fuel supply intermittent valve 6 based on the temperature obtained by the temperature deriving unit 22. By controlling the fuel supply amount adjusting valve 7 and the like, automatic temperature control of the heated object N, emergency fire extinguishing control when the heated object N is overheated, and the like are performed.

As the automatic temperature control and the emergency fire extinguishing control, it is possible to employ various known controls, so that detailed description will be omitted and an example will be briefly described.
In the automatic temperature control, the operation control unit 23 is configured so that the temperature of the article N to be heated obtained by the temperature deriving unit 22 becomes a target temperature set by a temperature setting unit (not shown) or the like. The heating power of the burner 30 is adjusted by adjusting the opening of the fuel supply amount adjusting valve 7.
In the emergency fire extinguishing control, the operation control unit 23 closes the fuel supply intermittent valve 6 when the temperature of the heated object N obtained by the temperature deriving unit 22 reaches a high cut temperature for preventing excessive temperature rise. By turning off the valve, the burner 30 is extinguished.

Next, the detection of the flame F by the flame detector 21 will be described.
The flame detector 21 is configured to detect the flame F based on the infrared intensity measured by the infrared intensity measuring device 40.
In other words, the infrared intensity measuring device 40 is configured to detect that the flame F is present when the infrared intensity of a certain level or more is measured.

Further, the infrared intensity measuring device 40 uses, as the infrared intensity of at least one of the plurality of temperature deriving wavelength ranges described above, the infrared intensity for the flame-affected wavelength range where the radiation intensity from the flame F formed by the burner 30 is weak. Is configured to measure.
That is, the infrared intensity measuring device 40 has a wavelength range in which the radiation intensity from the flame F is weak within the wavelength range of the infrared radiation emitted from the article N to be heated, in other words, a wavelength range that is slightly affected by the radiation from the flame F. The above-mentioned flame influence wavelength range is set, and the infrared intensity of the flame influence wavelength range is measured.
Specifically, referring to the infrared intensity spectrum distribution of the infrared rays emitted from the flame F shown in FIG. 3, for example, the flame influence wavelength region is slightly affected by the flame F, for example, 3.1 μm or more and 3. It can be set within a range of 3 μm or less, or within a range of 4.0 μm or more and 4.2 μm or less, and in this embodiment, the flame influence wavelength range is set to 3.1 μm.

  Then, the flame detection unit 21 assumes that the flame F is correctly formed, for example, that the infrared intensity for the flame-affected wavelength range has risen above a certain level before a certain time has elapsed since the ignition of the burner 30. The flame F can be detected. If the flame F cannot be detected, the operation control means 23 performs the above-described emergency fire extinguishing control and determines that the fuel supply intermittent valve 6 The burner 30 can be extinguished by closing the valve.

[Second Embodiment]
Hereinafter, a stove according to a second embodiment of the present invention will be described with reference to the drawings.
The stove of the second embodiment omits the description of the same configuration as the stove of the first embodiment, but the configurations of the infrared intensity measuring device 40 and the flame detection unit 22 are different from those of the first embodiment.

That is, the infrared intensity measuring device 40 of the second embodiment is different from the infrared intensity for each of the plurality of temperature deriving wavelength ranges, for the flame detection wavelength range within the wavelength range of the infrared rays emitted from the flame F. The infrared intensity is measured.
Specifically, as shown in FIG. 6, the infrared intensity measuring device 40 has two band-pass filters 41a and 41b that pass infrared rays in two temperature deriving wavelength ranges, as in the first embodiment. And two infrared elements 42a and 42b that individually measure the infrared intensity of the infrared rays that have passed through the two bandpass filters 41a and 41b, and in addition, allow the infrared rays in the flame detection wavelength range to pass. A band-pass filter 41c and an infrared element 42c for measuring the intensity of infrared light that has passed through the band-pass filter 41c are provided.

Therefore, the flame detection unit 21 can detect that the flame F is formed when the infrared intensity of the flame detection wavelength region measured by the infrared element 42c is greater than or equal to a certain value.
Then, the operation control means 23 determines that if the flame F is not detected by the flame detection unit 21 until a certain time has elapsed since the ignition of the burner 30 or during the operation of the burner 30, When the extinction has occurred, the burner 30 can be extinguished by closing the fuel supply intermittent valve 6.

Further, the wavelength range for flame detection may be any wavelength range within the wavelength range of infrared rays emitted from the flame F. For example, as shown in FIG. The flame detection unit 21 detects the flame F with high accuracy by setting it within a range larger than 0.2 μm and smaller than 8.0 μm, more preferably within a range larger than 4.2 μm and smaller than 4.7 μm. can do.
Further, the bandpass filter 41c may be omitted, or the bandpass filter 41c may be changed to one that allows infrared rays in all wavelength regions to pass.

[Third Embodiment]
Hereinafter, a third embodiment of a stove according to the present invention will be described with reference to the drawings.
The stove of the third embodiment omits the description of the same configuration as the stove of the second embodiment, but the configuration of the infrared intensity measuring device 40 is different from the second embodiment.

  That is, the infrared intensity measuring device 40 of the third embodiment includes a single infrared element 42 as a single measuring unit that measures infrared intensity, and a switching unit 47 that switches the wavelength range of infrared rays incident on the infrared element 42. It consists of and.

Specifically, as shown in FIG. 7, the infrared intensity measuring device 40 has two band-pass filters 41a and 41b that allow the infrared rays in the two temperature deriving wavelength ranges to pass through, as in the second embodiment. And a band-pass filter 41c that transmits infrared rays in the flame detection wavelength range. These three band-pass filters 41a, 41b, and 41c are arranged between the opening 44 and the infrared element 42 in the left and right directions. The filter arrangement plate 41 is supported by the packaging 43 so as to be freely displaceable.
The switching unit 47 is composed of an actuator that can slide the filter arrangement plate 41 to the left and right. The filter arrangement plate 41 is displaced to the left and right, so that the filter arrangement plate 41 is disposed between the opening 44 and the infrared element 42, respectively. By sequentially positioning the band-pass filters 41a, 41b, and 41c, the wavelength range of infrared rays incident on the infrared element 42 can be switched.

[Fourth Embodiment]
Hereinafter, a stove according to a fourth embodiment of the present invention will be described with reference to the drawings.
The stove according to the fourth embodiment is similar to the stove according to the third embodiment, in which the infrared intensity measuring device 40 has a single infrared element 42 as a single measuring unit for measuring the infrared intensity, and the infrared element 42. And a switching unit 47 for switching the wavelength range of the infrared rays incident on the.
Specifically, as shown in FIGS. 8A and 8B, the filter arrangement plate 41 is formed in a disk shape, and three band-pass filters 41a, 41b, 41c are formed on the filter arrangement plate 41. It arrange | positions in the circumferential direction, and it is comprised so that the switch part 47 may comprise the filter arrangement | positioning board 41 by a rotatable actuator, and the wavelength range of the infrared rays injected into the infrared element 42 is switched.

[Another embodiment]
Next, another embodiment will be described.
(1) In each of the above embodiments, the burner 30 is configured as a Bunsen combustion type internal flame type. However, as shown in FIG. 9, the burner 30 may be configured as a Bunsen combustion type external flame type. I do not care.
That is, the burner 30 includes a gas nozzle 31 and a mixing tube 32 similar to those in the above-described embodiment, and a plurality of flame ports 35 for ejecting the air-fuel mixture to the circumferential outer periphery, and the air-fuel mixture is supplied from the mixing tube 32. The outer flame casing member 36 is provided so as to protrude above the top plate 1.

  In the outer flame type burner 30, the mixture of the fuel gas G and the primary combustion air A supplied from the mixing pipe 32 into the outer flame casing member 36 is supplied from the flame port 35 to the outer flame casing member 36. The air-fuel mixture of the jetted fuel gas G and the primary combustion air A is burned outward in the radial direction, and a flame F is formed.

Then, the infrared ray emitted from the object to be heated N or the flame F is incident on the infrared flame type burner 30 through the window portion 50 formed on the top plate 1. In such a form, it can be provided below the top plate 1.
The window 50 may be sealed with a member that transmits infrared rays or may be an opening.

(2) In each of the above embodiments, the infrared intensity measuring device 40 is configured to measure the infrared intensity in each of two different temperature derivation wavelength ranges in the infrared rays emitted from the heated object N. The temperature deriving unit 22 is configured to obtain the temperature of the object to be heated N by using the infrared intensity for each of the two temperature deriving wavelength ranges measured. Infrared intensity is measured for three or more temperature deriving wavelength ranges, and the temperature deriving unit 22 is used to determine the temperature of the object N to be heated using the single or three or more infrared intensity. It doesn't matter.

That is, when the infrared intensity measuring device 40 is configured to measure the infrared intensity for each of a plurality of different wavelength ranges in the infrared ray radiated from the heated object N, the temperature deriving process by the temperature deriving unit 22. The specific configuration is not limited to the configuration illustrated in each of the above embodiments, that is, the configuration in which the temperature of the object to be heated is obtained based on the ratio of the infrared intensity for each of the two wavelength ranges. .
For example, by using a plurality of objects to be heated N having different emissivities in advance, the temperatures of the objects to be heated N are changed to a plurality of temperatures, and for each of the plurality of temperatures, the infrared intensity for each of the plurality of wavelength ranges is set. Thus, the infrared intensity for each of the plurality of wavelength ranges obtained in this way is stored as map data in a state corresponding to each of the plurality of temperatures.
Then, from the map data, an infrared intensity relationship that matches or is similar to the infrared intensity relationship for each of the plurality of wavelength ranges detected by the infrared intensity measuring device 40 is determined, and the determined infrared intensity A temperature corresponding to the relationship is obtained, and the obtained temperature is set as the temperature of the object to be heated.
In addition, you may abbreviate | omit the structure for temperature derivation | leading-out of these to-be-heated material N. FIG.

Schematic configuration diagram of a stove in the first embodiment Longitudinal section of infrared intensity measuring device Figure showing the infrared radiation intensity spectrum distribution emitted from the flame A diagram showing the relationship between the temperature of the object to be heated and the output of the infrared intensity measuring device The figure which shows the relationship between the temperature of the object to be heated and the output ratio of the infrared intensity measuring device Longitudinal sectional view of the infrared intensity measuring device in the second embodiment Longitudinal sectional view of the infrared intensity measuring device in the third embodiment Longitudinal sectional view (a) of infrared intensity measuring device according to the fourth embodiment and plan view (b) of filter arrangement plate Schematic configuration diagram of a stove in another embodiment

Explanation of symbols

21: Flame detection unit (flame detection means)
22: Temperature deriving unit (temperature deriving means)
30: Burner 40: Infrared intensity measuring device (infrared intensity measuring means)
42, 42a, 42b, 42c: Infrared element (measurement unit)
47: Switching unit

Claims (5)

A stove comprising a burner for heating an object to be heated, and a flame detection means for detecting a flame formed by the burner,
Infrared intensity measuring means for measuring the infrared intensity of infrared rays emitted from the flame formed by the burner,
A stove configured such that the flame detection means detects the flame based on the infrared intensity measured by the infrared intensity measurement means. The infrared intensity measuring means is configured to measure the infrared intensity for each of a plurality of different temperature deriving wavelength ranges within the wavelength range of infrared rays emitted from the object to be heated;
2. The stove according to claim 1, further comprising a temperature deriving unit that obtains the temperature of the object to be heated based on an infrared intensity relationship for each of the plurality of temperature deriving wavelength ranges measured by the infrared intensity measuring unit. The infrared intensity measuring means measures the infrared intensity for the flame influence wavelength range where the radiation intensity from the flame is weak, as the infrared intensity for the at least one temperature deriving wavelength range,
The stove according to claim 2, wherein the flame detection means is configured to detect the flame based on an infrared intensity for the flame influence wavelength region. The infrared intensity measuring means measures the infrared intensity for the flame detection wavelength range within the wavelength range of infrared rays emitted from the flame, separately from the infrared intensity for each of the plurality of temperature derivation wavelength ranges,
The stove according to claim 2, wherein the flame detection means is configured to detect the flame based on an infrared intensity for the flame detection wavelength region.   The said infrared intensity measurement means is comprised by the single measurement part which measures infrared intensity, and the switching part which switches the wavelength range of the infrared rays which inject into the said measurement part. The stove described.

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