JP5684625B2 - Stove - Google Patents

Description

  The present invention provides a top plate having an infrared transmitting portion that is capable of placing a cooking container and is made of a translucent member and capable of transmitting infrared rays in the vertical direction, and the cooking placed on the top plate. An infrared ray installed on the lower side of the top plate so as to detect an infrared intensity which is an infrared radiation intensity emitted from the bottom of the cooking container and transmitted through the infrared transmitting part. The present invention relates to a stove including intensity detection means and temperature calculation means for obtaining the temperature of the cooking container based on the infrared intensity detected by the infrared intensity detection means.

The stove is configured to detect the infrared intensity of infrared rays radiated from the bottom of the cooking container placed on the top plate, and obtain the temperature of the cooking container based on the detected infrared intensity. Thus, the temperature of the cooking container can be obtained without contact. Incidentally, the temperature of the cooking container thus obtained is used, for example, for burner control for controlling the burner in order to adjust the temperature of an object to be heated in the cooking container or to prevent overheating.
The top plate is provided with an infrared transmission part capable of transmitting infrared rays in the vertical direction, and the infrared intensity detection means for detecting the infrared intensity is the infrared intensity of the infrared rays emitted from the bottom of the cooking container and transmitted through the infrared transmission part Is installed on the lower side of the top plate. Thereby, it is avoided that the infrared intensity detecting means is contaminated by the broth spilled from the cooking container and the infrared intensity cannot be detected properly.

  By the way, there is a possibility that the infrared transmission part may be soiled by the broth or the like that has been blown from the cooking container. And if the infrared transmission part is soiled, the infrared transmission state, which is the degree of infrared transmission in the infrared transmission part, is lowered, so that the infrared intensity detection means cannot properly detect the infrared intensity, and eventually the cooking container The temperature cannot be determined properly.

Therefore, in the conventional stove, a light emitting device that emits dirt detection light toward the infrared transmitting portion below the top plate, and light reflected from the infrared transmitting portion of the light emitted from the light emitting device is reflected. A light receiving device for detection is provided, and it is configured to determine whether or not the infrared transmission state of the infrared transmission unit is normal based on light reception information of the light receiving device (see, for example, Patent Document 1).
In other words, for example, the amount of light received by the light receiving device varies depending on the presence or absence of dirt on the infrared transmitting portion, such as the amount of light received by the light receiving device increases as the degree of contamination on the infrared transmitting portion increases. Based on the light reception information of the apparatus, the infrared transmission state of the infrared transmission unit is determined to be normal.

JP 2006-220395 A

  However, in the conventional stove, the light emitting device and the light receiving device as described above are provided in order to determine whether or not the infrared transmitting state of the infrared transmitting portion is normal. There was a problem of becoming higher.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a stove capable of reducing the price while appropriately determining whether or not the infrared transmission state of the infrared transmission unit is normal. is there.

The stove according to the present invention is mounted on a top plate that can be placed with a cooking container and has an infrared transmitting portion that is made of a translucent member and can transmit infrared rays in the vertical direction. A burner that heats the cooking container and an infrared ray intensity that is an infrared radiation intensity that is radiated from the bottom of the cooking container and transmitted through the infrared transmitting part is installed below the top plate. Infrared intensity detection means, and based on the infrared intensity detected by the infrared intensity detection means, a temperature calculation means for determining the temperature of the cooking container,
1st characteristic structure is comprised so that the said infrared intensity detection means may detect the said infrared intensity in the state containing the infrared rays radiated | emitted from the flame formed with the said burner, and permeate | transmitted the said infrared rays transmission part,
In the reference state where the combustion state of the burner is the reference state or the reference container temperature is the reference temperature, and the infrared transmission state of the infrared transmission part is normal, the infrared intensity detecting means Storage means for storing the detected infrared intensity as a reference infrared intensity,
Based on the reference infrared intensity stored in the storage means and the infrared intensity detected by the infrared intensity detection means in the reference state, it is determined whether or not the infrared transmission state of the infrared transmission part is normal. The transmission state determination means is provided.

According to the above characteristic configuration, the transmission state determination unit is configured to transmit the infrared transmission state of the infrared transmission unit based on the reference infrared intensity stored in the storage unit and the infrared intensity detected by the infrared intensity detection unit in the reference state. Whether or not is normal.
That is, if the infrared transmission state of the infrared transmission part is normal, the infrared intensity detected by the infrared intensity detection means in the reference state is equivalent to the reference infrared intensity, and the infrared transmission part is contaminated with boiling juice and the infrared transmission state. Since the infrared intensity detected by the infrared intensity detection means in the reference state is smaller than the reference infrared intensity, the reference infrared intensity and the infrared intensity detected by the infrared intensity detection means in the reference state Based on the above, it can be determined whether or not the infrared transmission state of the infrared transmission unit is normal.
The transmission state determination means can be configured using a controller originally provided in such a stove for controlling the operation of the burner, and the storage means is also an internal memory originally provided in the controller. Therefore, in order to determine whether or not the infrared transmission state of the infrared transmission part is normal, it is not necessary to provide a dedicated member such as a light emitting device and a light receiving device provided in a conventional stove, which increases the cost. It can be avoided.
Therefore, it is possible to provide a stove that can reduce the price while appropriately determining whether or not the infrared transmission state of the infrared transmission unit is normal.

In addition to the first feature configuration, the second feature configuration is
Combustion state determination means is provided for determining which one of a plurality of different combustion states is a combustion state of the burner,
The storage means uses the detection value of the infrared intensity detection means for the infrared rays radiated from the flame and transmitted through the infrared transmission part having the normal infrared transmission state as the reference infrared intensity, and each of the plurality of combustion states. Configured to store in association with each other,
The transmission state determination unit obtains the reference infrared intensity corresponding to the combustion state determined by the combustion state determination unit from the storage information of the storage unit, with each of the plurality of combustion states as the reference state, Based on the reference infrared intensity and the infrared intensity detected by the infrared intensity detecting means, it is configured to determine whether or not the infrared transmission state is normal.

That is, the burner has a plurality of different combustion states, such as the ignition state immediately after the burner is ignited, and the amount of combustion even when the burner is burning, and in each such combustion state from the flame. The radiant intensity of the emitted infrared rays is a predetermined value that is known in advance.
Therefore, the detection value of the infrared intensity detection means for the infrared rays radiated from the flame and transmitted through the infrared transmission portion having a normal infrared transmission state is stored as the reference infrared intensity in the storage means in association with each of the plurality of combustion states. Let
Then, using each of the plurality of combustion states of the burner as a reference state, it is determined which of the plurality of combustion states is the combustion state, and the reference infrared intensity corresponding to the determined combustion state is stored in the storage means Obtained from the reference infrared intensity and the infrared intensity detected by the infrared intensity detection means to determine whether or not the infrared transmission state is normal, even if the combustion state of the burner is different Whether or not the infrared transmission state is normal can be determined.
However, in a state where the cooking container is not placed, or a state where the cooking container placed at room temperature or lower than room temperature is placed on the top plate, the influence of the infrared intensity from the cooking container is weakened or eliminated. Therefore, it is preferable to determine whether or not the infrared transmission state is normal.
Therefore, although the combustion state of the burner is set variously among the plurality of combustion states by the user, it can be determined whether or not the infrared transmission state is normal in each combustion state, so the infrared transmission state is normal. It can be reliably determined whether or not.

The third feature configuration is in addition to the second feature configuration,
The combustion state determining means is configured to determine that the combustion state of the burner has changed among the plurality of combustion states;
When the permeation state determination unit determines the change in the combustion state by the combustion state determination unit, the permeation state determination unit responds to the change in the combustion state determined by the combustion state determination unit from the stored information of the storage unit. A reference infrared intensity fluctuation amount which is a fluctuation amount of the reference infrared intensity is obtained, and based on the reference infrared intensity fluctuation amount and a detected infrared intensity fluctuation amount which is an infrared intensity fluctuation amount detected by the infrared intensity detecting means. The infrared transmission state is determined to be normal.

That is, for example, when the burner is ignited, the combustion state of the burner changes from the fire extinguishing state to the ignition state, and when the burner combustion amount is changed and adjusted, the combustion state of the burner changes. Such a change in the combustion state is usually performed with the cooking container placed on or not placed on the top board, and the cooking container is placed on the top board. The temperature of the cooking container is considered to hardly change before and after the change of the combustion state.
Therefore, when the burner combustion state fluctuates between a plurality of combustion states, when the amount of change in the infrared intensity detected by the infrared intensity detection means is obtained as the detected infrared intensity change amount, the detected infrared intensity change amount is The infrared intensity for the infrared radiation emitted from the cooking container is offset, and this can be regarded as the variation in the infrared intensity for only the infrared radiation emitted from the flame.
In addition, when the infrared transmission state of the infrared transmission part is lowered, the infrared intensity detected by the infrared intensity detection means is approximately the same ratio as when the infrared transmission state is normal before and after the fluctuation of the combustion state. Decrease. That is, the infrared intensity detected by the infrared intensity detection means before the change in the burner combustion state is smaller than the reference infrared intensity corresponding to the combustion state before the change, and the infrared intensity detection means after the change in the burner combustion state. Infrared intensity detected in is also smaller than the reference infrared intensity corresponding to the combustion state after the fluctuation. Therefore, the detected infrared intensity fluctuation amount according to the fluctuation of the combustion state is the reference infrared intensity corresponding to the fluctuation of the combustion state. It is smaller than the fluctuation amount.
That is, when the combustion state changes, the detected infrared intensity fluctuation amount and the reference infrared intensity fluctuation amount corresponding to the combustion state fluctuation are obtained, and based on the detected infrared intensity fluctuation amount and the reference infrared intensity fluctuation amount. If it is configured to determine whether or not the infrared transmission state is normal, it can be appropriately determined whether or not the infrared transmission state is normal regardless of the temperature of the cooking container placed on the top plate.
Therefore, although the combustion state of the burner is variously changed between a plurality of combustion states by the user, it is possible to appropriately determine whether or not the infrared transmission state is normal by using the change.

In addition to the third feature configuration, the fourth feature configuration is
The combustion state determining means is configured to determine a variation between a fire extinguishing state where the burner is extinguished and an ignition state where the burner is ignited as a variation of the combustion state.

That is, when the burner is extinguished, there is no infrared radiation from the flame, and normally, the burner is ignited with a predetermined amount of ignition combustion, so that the infrared radiation emitted from the flame in the ignition state immediately after the burner is ignited. The intensity is a predetermined value that is known in advance.
Therefore, the storage means stores the infrared intensity when the burner is burning at the ignition combustion amount as the reference infrared intensity. Incidentally, the reference infrared intensity in the fire extinguishing state is set to 0, for example.
When the combustion state of the burner is changed from the fire extinguishing state to the ignition state, it is determined that the combustion state of the burner has fluctuated, and the detected infrared intensity fluctuation amount and the reference infrared intensity fluctuation amount according to the fluctuation of the combustion state are obtained. If it is configured to determine whether or not the infrared transmission state is normal based on the detected infrared intensity variation and the reference infrared intensity variation, it is possible to appropriately determine whether or not the infrared transmission state is normal.
Accordingly, it is possible to appropriately determine whether the infrared transmission state is normal when the burner is ignited, so that the stove can be used more safely.

In addition to the third or fourth feature configuration, the fifth feature configuration includes:
Combustion amount adjusting means capable of changing and adjusting the combustion amount of the burner as the combustion state is provided,
The combustion state determining means is configured to be able to detect the combustion amount adjusted by the combustion amount adjusting means, and is configured to determine a variation in the combustion amount as a variation in the combustion state.

That is, the infrared radiation intensity emitted from the flame of the burner is a value corresponding to the burner burn amount, and the reference infrared ray intensity is stored in the storage means according to the burner burn amount.
Then, when the combustion amount of the burner is changed and adjusted by the combustion amount adjusting means, the detected infrared intensity fluctuation amount and the reference infrared intensity fluctuation amount according to the fluctuation of the combustion amount are obtained, and the detected infrared intensity fluctuation amount and If it is configured to determine whether the infrared transmission state is normal based on the reference infrared intensity fluctuation amount, it is possible to appropriately determine whether the infrared transmission state is normal.
Accordingly, it is possible to appropriately determine whether or not the infrared transmission state is normal when the cooking container is heated by burning the burner, so that the stove can be used more safely.

In addition to the fifth feature configuration, the sixth feature configuration is
The combustion amount adjusting means includes an actuator for changing and adjusting the combustion amount;
When the permeation state determination unit does not determine the change in the combustion state by the combustion state determination unit for a set time, the actuator of the combustion amount adjustment unit is operated to change and adjust the combustion amount. It is in the point which is comprised.

According to the above characteristic configuration, when the combustion state is not changed during the set time, the actuator is forcibly actuated, and the combustion amount of the burner is changed and adjusted by the combustion amount adjusting means, so that the infrared transmission state is normal. It is determined whether or not.
Therefore, even when cooking is performed in which the heating power is not changed for a relatively long time, such as stewed cooking, it is determined whether or not the infrared transmission state is normal, so the stove can be used more safely.

In addition to any of the third to sixth feature configurations described above, the seventh feature configuration is provided in a state of being in contact with the flame, and is provided with a flame detection means for outputting information according to the temperature of the flame,
The storage means is configured to store output information of the flame detection means as reference output information in association with each of the plurality of combustion states,
The combustion state discriminating unit discriminates whether or not the burner has ignited and the burner combustion amount based on the output information of the flame detecting unit and the reference output information stored in the storage unit. Thus, it is configured to discriminate fluctuations in the combustion state of the burner.

That is, the flame detection means provided in contact with the flame outputs information according to the burner combustion state, such as whether or not the burner has ignited and the amount of burner burn, and the output information is sent from the infrared transmitting section. This is unrelated to the infrared transmission state.
Therefore, the storage means stores the output information of the flame detection means as reference output information in association with each of a plurality of combustion states, and the output information of the flame detection means and the reference output stored in the storage means By determining whether or not the burner has ignited and the amount of combustion of the burner based on the information, it is possible to appropriately determine the change in the combustion state of the burner.
Therefore, since the variation in the combustion state of the burner can be appropriately determined, it is possible to appropriately determine whether or not the infrared transmission state is normal.

In addition to any one of the third to seventh feature configurations described above, the eighth feature configuration is
The transmission state determination means obtains a degree of decrease in the detected infrared intensity fluctuation amount with respect to the reference infrared intensity fluctuation amount, and when the reduction degree is larger than a set value for abnormality determination, the infrared transmission state is abnormal. Is configured to determine,
When the degree of decrease is equal to or less than the set value for abnormality determination, the temperature calculation means is configured to obtain the temperature of the cooking container in a state of correcting based on the degree of decrease.

According to the above characteristic configuration, when the degree of decrease in the detected infrared intensity variation with respect to the reference infrared intensity variation is greater than the abnormality determination setting value, it is determined that the infrared transmission state is abnormal.
On the other hand, when the decrease degree is equal to or less than the set value for abnormality determination, the temperature of the cooking container is obtained in a state of correcting based on the decrease degree.
In other words, when the degree of contamination of the infrared transmission part is large and the degree of decrease in detected infrared intensity is large, the accuracy of the cooking container may be deteriorated if the temperature of the cooking container is determined based on the detected infrared intensity. It is determined that the infrared transmission state is abnormal, and a safety measure such as activating the alarm means or extinguishing the burner is taken.
On the other hand, when the degree of contamination of the infrared transmitting portion is small and the degree of decrease in the detected infrared intensity is small, the cooking container is adjusted in a state where correction is made based on the degree of decrease in the detected infrared intensity variation with respect to the reference infrared intensity variation. By calculating | requiring temperature, it suppresses that the precision of the calculated | required temperature deteriorates, and enables continuation of the heating cooking by a burner.
Therefore, the stove can be used more safely.

The ninth feature configuration is in addition to any one of the first to eighth feature configurations,
The infrared intensity detecting means is configured to detect infrared radiation intensity in a specific wavelength region of infrared rays transmitted through the infrared transmission part as the infrared intensity;
The storage means is configured to store, as the reference infrared intensity, the infrared radiation intensity of the specific wavelength region of the infrared radiation emitted from the flame and transmitted through the infrared transmission part;
The temperature calculating means is configured to determine the temperature of the cooking container based on the infrared intensity detected by the infrared intensity detecting means and the reference infrared intensity,
The specific wavelength range is that the infrared radiation intensity radiated from the flame is set within a wavelength range that is smaller than the radiation intensity of other wavelength bands.

According to the above characteristic configuration, the infrared intensity in the specific wavelength region of the infrared rays transmitted through the infrared transmitting portion is detected as the infrared intensity by the infrared intensity detecting means.
The storage means stores the infrared radiation intensity of a specific wavelength region of the infrared radiation radiated from the flame and transmitted through the infrared transmission section as the reference infrared intensity.
And the temperature of a cooking container is calculated | required by the temperature calculation means based on the infrared intensity detected by the infrared intensity detection means and the reference infrared intensity.
For example, by subtracting the reference infrared intensity from the infrared intensity detected by the infrared intensity detection means and obtaining the temperature of the cooking container based on the infrared intensity, the temperature of the cooking container is suppressed by suppressing the influence of the flame. Can be sought.
Moreover, since the specific wavelength range is set within a wavelength range in which the infrared radiation intensity radiated from the flame is smaller than the radiation intensity of other wavelength bands, when determining the temperature of the cooking container based on the infrared intensity, The influence of flame can be further suppressed.
Therefore, the temperature of the cooking container heated by the burner can be accurately obtained by reducing the influence of the infrared rays emitted from the flame.

In addition to the ninth feature configuration, the tenth feature configuration includes:
The infrared intensity detection means is configured to detect infrared intensity of each of the plurality of specific wavelength ranges that are different wavelength ranges,
The storage means is configured to store the reference infrared intensity corresponding to each of the plurality of specific wavelength ranges;
The temperature calculation means obtains a plurality of the reference infrared intensities corresponding to the plurality of specific wavelength ranges from the storage information of the storage means, and the infrared intensity for the plurality of reference infrared intensities and the plurality of specific wavelength ranges The temperature of the cooking container is determined based on a plurality of infrared intensities detected by the detecting means.

According to the above characteristic configuration, the infrared intensity of each of a plurality of specific wavelength ranges, which are different wavelength ranges, is detected by the infrared intensity detection means.
The storage means stores the reference infrared intensity corresponding to each of the plurality of specific wavelength ranges.
And the temperature of the cooking container is based on the plurality of infrared intensities detected by the infrared intensity detecting means for the plurality of specific wavelength ranges by the temperature calculating means and the plurality of reference infrared intensities stored in the storage means. Is required.
For example, the correlation between the ratio of the infrared intensity and the temperature of the cooking container is measured and stored in advance for a plurality of specific wavelength ranges. Then, by subtracting the respective reference infrared intensity from the detected infrared intensity of each of the plurality of specific wavelength ranges detected by the infrared intensity detection means, the flame depletion infrared intensity is obtained for the plurality of specific wavelength ranges, It is set as the structure which calculates | requires the temperature of the container for cooking from the ratio of the flame part killing infrared intensity calculated | required about the wavelength range, and the correlation memorize | stored in the memory | storage means.
By comprising in this way, it becomes possible to obtain | require appropriately the temperature of a cooking container irrespective of the difference in the emissivity of a cooking container.

Schematic diagram of stove Figure showing the spectral data of infrared radiation intensity Figure showing the spectral data of infrared radiation intensity Figure showing the spectral data of infrared radiation intensity Figure showing the spectral data of infrared radiation intensity Diagram showing correlation between burner fire power and infrared intensity from flame Diagram showing correlation between burner fire power and infrared intensity from flame Diagram showing correlation between burner thermal power and reference electromotive force The figure which shows correlation with the temperature of the container for cooking, and the output of an infrared intensity detection part The figure which shows the correlation with the temperature of the container for cooking, and the output ratio of an infrared intensity detection part

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the stove has a flat top plate 1 made of a material having heat resistance, a virtues 2 installed on the top plate 1 and on which a cooking container N can be placed, and the virtues. 2, the burner 20 for heating the cooking container N, the stove controller 30 for controlling the operation of the stove, and the stove controller 30 with an ignition command, a fire extinguishing command, a fire power setting command, etc. A manual operation type operation unit 3 or the like for commanding is provided. Incidentally, the operation unit 3 is configured so that the heating power of the burner 20 can be set in five stages, for example, 1 to 5 (heating power 1 <heating power 2 <... <Heating power 5).

  The burner 20 is of the Bunsen combustion type, and a gas nozzle 21 that ejects the fuel gas G supplied through the fuel supply path 4, the fuel gas G is ejected from the gas nozzle 21, and the suction action associated with the ejection of the fuel gas G And a burner body 24 provided with a plurality of flame ports 23 on the outer peripheral surface for jetting the air-fuel mixture supplied from the mixing pipe 22 radially outward. Configured.

The top plate 1 is provided with a burner opening 1 a, and the burner 20 is installed below the top plate 1 in a form in which the burner body 24 is inserted through the burner opening 1 a and exposed above the top plate 1. Yes.
And the air-fuel mixture is ejected radially from the plurality of flame outlets 23 of the burner body 24, the air-fuel mixture burns to form a flame F, and the cooking container N is heated.
In the vicinity of the flame opening 23 of the burner 20, a flame sensor 5 composed of a thermocouple is provided in contact with the flame F. The flame sensor 5 is configured to output a thermoelectromotive force (voltage) corresponding to the temperature of the flame F in a state in which the flame power increases as the heating power of the burner 20 increases and the temperature of the flame F increases. That is, the flame sensor 5 functions as a flame detection unit that outputs information according to the temperature of the flame F.
Although not shown, an ignition igniter is provided in the vicinity of the flame opening 23 of the burner 20.

In the fuel supply path 4, a governor 6 that adjusts the pressure of the supplied fuel gas G to a set value, a fuel supply intermittent valve 7 that intermittently supplies the fuel gas G to the gas nozzle 21, and a fuel gas to the gas nozzle 21 A fuel supply amount adjustment valve 40 for adjusting the supply amount of G is provided. That is, the fuel supply amount adjusting valve 40 corresponds to a combustion amount adjusting means capable of changing and adjusting the combustion amount of the burner 20.
The fuel supply amount adjustment valve 40 has an opening degree by moving and operating an opening degree adjusting body (not shown) by an electric operation mechanism 41 (corresponding to an actuator) using, for example, an electric motor and a screw feed mechanism. The operation position sensor 42 detects the moving operation position of the opening adjuster.

  In the top plate 1, a window opening 1 b is formed near the side of the burner main body 24 at a position corresponding to the lower side of the flame F formed by the burner 20, and infrared rays can be transmitted through the window opening 1 b. A plate-like light-transmitting plate 8 is fitted. The translucent plate 8 is made of a material different from that of the top plate 1. The window opening 1b and the translucent plate 8 constitute an infrared transmission window 9 as an infrared transmission section made of a translucent member and capable of transmitting infrared rays in the vertical direction.

  In this stove, an infrared intensity detector 50 as an infrared intensity detector is radiated from the bottom of the cooking container N placed on the top plate 1 and transmitted through the infrared transmission window 9. A temperature calculating means that is installed on the lower side of the top plate 1 so as to detect the infrared intensity that is the intensity, and further calculates the temperature of the cooking container N based on the infrared intensity detected by the infrared intensity detecting unit 50. 32 is provided.

  Next, the stove controller 30 will be described. The stove controller 30 is configured using a microcomputer, and is configured to execute various controls by executing a predetermined computer program. And the combustion control means 31 which controls the action | operation of the burner 20 is comprised using this stove controller 30, and the above-mentioned temperature calculation means 32 is also comprised using this stove controller 30. FIG.

The combustion control means 31 executes an ignition process for igniting the burner 20 when an ignition command is commanded from the operation unit 3. In this ignition process, the fuel supply intermittent valve 7 is opened, and the fuel supply amount adjusting valve is based on the detection information of the operation position sensor 42 so that the operation position corresponds to the ignition thermal power (for example, thermal power 3). The igniter is operated by controlling the operation mechanism 41 of 40. When the ignition of the burner 20 is confirmed by the flame sensor 5, the operation of the igniter is stopped.
Further, the combustion control means 31 sets the heating power from the operation unit 3 in a state where the ignition of the burner 20 is confirmed by the flame sensor 5 and the ignition process is completed, and the combustion of the burner 20 is confirmed by the flame sensor 5. Based on the command, the heating mechanism (burning amount) of the burner 20 is adjusted by controlling the operating mechanism 41 based on the detection information of the operating position sensor 42 so that the operating position corresponds to the set heating power. That is, when a change of the thermal power is commanded from the operation unit 3, the thermal power of the burner 20 is changed and adjusted by controlling the operation mechanism 41 so that the operation position corresponds to the changed thermal power. .

  Further, the combustion control means 31 closes the fuel supply intermittent valve 7 and the fuel supply amount adjustment valve 40 when the combustion of the burner 20 is not confirmed by the flame sensor 5 or when a fire extinguishing command is commanded from the operation unit 3. The fire extinguishing process for extinguishing the burner 20 is executed.

Next, the infrared intensity detection unit 50 will be described.
The infrared intensity detection unit 50 is configured to detect infrared intensity in a state including infrared rays emitted from the flame F formed by the burner 20 and transmitted through the infrared transmission window 9. Of the transmitted infrared rays, the infrared radiation intensity in a specific wavelength range is detected as the infrared intensity.
Furthermore, the infrared intensity detection unit 50 is configured to detect the infrared intensity of each of two specific wavelength ranges that are different wavelength ranges.
In other words, as shown in FIG. 1, the infrared intensity detector 50 includes two bandpass filters 51a and 51b having different wavelength ranges of infrared rays to be transmitted, and these two bandpass filters 51a and 51b. It comprises two infrared detecting elements 52a and 52b that individually detect the passed infrared rays, and detects the infrared intensity for each of two different specific wavelength ranges in the infrared rays emitted from the cooking container N. It is configured as follows. The bandpass filters 51a and 51b are configured to transmit only infrared rays in a predetermined wavelength range. In this embodiment, the two specific wavelength regions are set in a wavelength region in which the infrared radiation intensity emitted from the flame F formed by the burner 20 is smaller than the radiation intensity in the other wavelength regions. Specifically, a wavelength range of 3.5 μm to 4.0 μm and a wavelength range of 9.0 μm to 12.0 μm are set as the two specific wavelength ranges.

  As the two infrared detecting elements 52a and 52b for detecting the infrared intensity in such a wavelength range, Ge or InGaAs is used as an infrared cell, PbS or PbSe is used as an infrared cell, and HgCdTe is infrared. Various things, such as what was used as a cell, can be utilized.

In the present invention, the infrared intensity detected by the infrared intensity detector 50 is determined as the reference infrared ray in the reference state where the burner 20 is in the reference state and the infrared transmission state of the infrared transmission window 9 is normal. Based on the reference infrared intensity stored in the storage 33 and the infrared intensity detected by the infrared intensity detector 50 in the reference state, the infrared transmission window 9 is stored as storage means for storing the intensity. Transmission state determining means 34 for determining whether or not the infrared transmission state is normal.
Here, in this embodiment, the reference state is mainly a fire extinguishing state in which the burner 20 is extinguished, or a state corresponding to a plurality of stages of thermal power, and each of the plurality of stages of thermal power. As the corresponding state, five states of thermal power 1 to thermal power 5 are set.

In this embodiment, combustion state determination means 35 is provided for determining whether the combustion state of the burner 20 is one of a plurality of different combustion states.
Incidentally, the storage unit 33 is configured by an internal memory of the stove controller 30, and the permeation state determination unit 34 and the combustion state determination unit 35 are configured by using the stove controller 30.

Hereinafter, a configuration for determining whether the infrared transmission state in the transmission state determination unit 34 is normal and a configuration for determining the combustion state in the combustion state determination unit 35 will be described.
First, the storage information stored in the storage unit 33 will be described.
In FIGS. 2 and 3, the infrared transmission state is normal when the cooking container N is heated to 200 ° C. by the burner 20 in a state where, for example, tempura oil is contained in the cooking container N. An infrared radiation intensity spectrum distribution that has passed through an infrared transmission window 9 (not soiled) is shown. FIG. 3 is a diagram in which a part thereof is enlarged in the vertical axis direction in order to make the description of FIG. 2 easy to understand. Incidentally, the line L1 in the figure is the infrared radiation intensity spectrum distribution in the state where the burner 20 is burning with the thermal power 5, and the line L2 is the infrared radiation intensity when the burner 20 is burning with the thermal power 3. This is a spectral distribution, and a line L3 is an infrared radiant intensity spectral distribution in a state where the burner 20 is burning with a thermal power 1.

  On the other hand, FIG. 4 and FIG. 5 show that ice water is put into the cooking container N placed in Gotoku 2 and the bottom of the cooking container N is at a low temperature (normal temperature or lower) and a burner. FIG. 5 shows the infrared intensity spectrum distribution of the infrared rays transmitted through the infrared transmission window 9 where the infrared transmission state is normal in the state where 20 forms the flame F. FIG. 5 shows a part of FIG. FIG. The line L4 in the figure is the infrared radiation intensity spectrum distribution in the state where the burner 20 is burning with the thermal power 5, and the line L5 is the infrared radiation intensity spectrum distribution in the state where the burner 20 is burning with the thermal power 3. The line L6 is the infrared radiation intensity spectrum distribution in a state where the burner 20 is burning with the thermal power 1.

By the way, in each of FIGS. 3 and 5, λ1 and λ2 indicate two specific wavelength ranges, and the wavelength range λ2 is longer than the wavelength range λ1.
3 and 5, the infrared intensity in each of the wavelength ranges λ1 and λ2 is data detected by the infrared intensity detector 50 provided in the stove.

2, 3, 4, and 5, the infrared radiation intensity transmitted through the infrared transmission window 9 in the normal infrared transmission state is the infrared radiation intensity emitted from the bottom of the cooking container N and the flame. It can be seen that the infrared radiation intensity emitted from F is combined.
And it radiated | emitted from the bottom part of the cooking container N of the same temperature conditions (normal temperature or temperature lower than it) from which the data of FIG.4 and FIG.5 was obtained, and permeate | transmitted the infrared rays transparent window 9 with a normal infrared rays transmission state. When the infrared radiation intensity is measured and the measured radiation intensity is subtracted from the radiation intensity spectrum distribution as shown in FIGS. 4 and 5, the flame F of the burner 20 when the heating power (combustion amount) of the burner 20 is variously changed. Infrared radiation intensity (reference infrared intensity) from can be determined.

  For example, as shown in FIG. 6 for the wavelength region λ1 and in FIG. 7 for the wavelength region λ2, the correlation between the thermal power and the reference infrared intensity is obtained. Incidentally, the infrared intensity in FIG. 6 is a value obtained by integrating the infrared intensity in FIG. 5 in the range of the wavelength region λ1, and similarly, the infrared intensity in FIG. 7 is integrated in the range of the wavelength region λ2. It is the value.

  For example, for each of the specific wavelength ranges λ1 and λ2, information on the correlation between the thermal power and the reference infrared intensity (hereinafter sometimes referred to as thermal power versus reference infrared intensity relation information) is stored in the storage unit 33. . Incidentally, this thermal power / reference infrared intensity relationship information may be set and stored as an approximate expression or may be stored as map data. Further, the thermal power / reference infrared intensity relationship information stored in the storage unit 33 includes a reference infrared intensity of 0 corresponding to the fire extinguishing state in which the burner 20 is not combusted.

Here, the fire extinguishing state in which the burner 20 is not combusting and the state in which the burner 20 is combusting in five stages of thermal power (corresponding to the amount of combustion of the burner 20) are a plurality of combustion states of the burner. To do.
Then, the storage unit 33 uses the detection value of the infrared intensity detection unit 50 for the infrared rays radiated from the flame F and transmitted through the infrared transmission window 9 having the normal infrared transmission state as the reference infrared intensity, for each of the plurality of combustion states. It is configured to store in association with each other.
In addition, the storage unit 33 is configured to store the infrared radiation intensity in a specific wavelength region of the infrared radiation emitted from the flame F and transmitted through the infrared transmission window 9 as the reference infrared intensity.
Further, the storage unit 33 is configured to store the reference infrared intensity corresponding to each of the two specific wavelength ranges.

  FIG. 7 shows the correlation between the thermal power and the infrared intensity when the infrared transmission window 9 is soiled and its infrared transmission state is lowered by the broken line and the alternate long and short dash line. By the way, the broken line shows the case where the infrared transmittance of the infrared transmission window 9 is lowered to 80% of the normal state and the infrared intensity is lowered to 80% of the reference infrared intensity. The case where the infrared transmittance of the window 9 is reduced to 60% of the normal state and the infrared intensity is reduced to 60% of the reference infrared intensity is shown.

On the other hand, there is a correlation as shown in FIG. 8 between the thermal power and the electromotive force (voltage) of the flame sensor 5.
The information on the correlation between the thermal power and the electromotive force (voltage) of the flame sensor 5 as shown in FIG. 8 indicates that the thermal power (corresponding to the combustion amount of the burner 20) and the reference electromotive force (reference output information) of the flame sensor 5. As the correlation information (hereinafter referred to as thermal power vs. reference electromotive force relationship information). Incidentally, this thermal power vs. reference electromotive force relation information may be set and stored as an approximate expression or may be stored as map data. In addition, the thermal power versus reference electromotive force relation information stored in the storage unit 33 includes zero reference electromotive force corresponding to the fire extinguishing state in which the burner 20 is not combusted.
That is, the storage unit 33 is configured to store the output information of the flame sensor 5 as the reference output information in association with each of the plurality of combustion states.

Next, the combustion state determination unit 35 will be described. The combustion state discriminating means 35 is configured to discriminate fluctuations in the combustion state of the burner 20 based on the electromotive force of the flame sensor 5 and the thermal power versus reference electromotive force relation information.
Specifically, when the electromotive force of the flame sensor 5 changes from 0 to a reference electromotive force corresponding to the ignition thermal power (for example, thermal power 3), the combustion state determination unit 35 ignites the combustion state of the burner 20 from the extinguished state. It is determined that the state has changed.
Also, the combustion state determination means 35, for example, changes the thermal power from the thermal power 2 to the thermal power 5 when the electromotive force of the flame sensor 5 changes from the reference electromotive force corresponding to the thermal power 2 to the electromotive force corresponding to the thermal power 5. Is determined based on the relationship between the electromotive force of the flame sensor 5 and the thermal power vs. reference electromotive force.

That is, in this embodiment, the combustion state determination unit 35 is configured as described above, so that the combustion state determination unit 35 determines that the combustion state of the burner 20 has changed among a plurality of combustion states. It will be configured as follows.
Further, the combustion state determining means 35 is configured to determine a variation between the extinguishing state where the burner 20 is extinguished and the ignition state where the burner 20 is ignited as a variation of the combustion state.
Further, the combustion state determination means 35 is configured to be able to detect the combustion amount adjusted by the fuel supply amount adjustment valve 40, and is configured to determine a variation in the combustion amount as a variation in the combustion state. .
Furthermore, the combustion state determination means 35 determines whether or not the burner 20 has ignited based on the output information of the flame detection sensor 5 and the reference electromotive force (reference output information) stored in the storage unit 33, and The thermal power (combustion amount) of the burner 20 is determined, and the change in the combustion state of the burner 20 is determined.

Next, the transmission state determination means 34 will be described.
In this embodiment, when the transmission state determination means 34 determines whether the infrared transmission state is normal, the specific wavelength region λ2 having the larger infrared intensity out of the two specific wavelength regions λ1 and λ2. It is configured to use information on the relationship between the heating power and the reference infrared intensity.

When it is determined by the combustion state determination unit 35 that the combustion state of the burner 20 has changed from the fire extinguisher state to the ignition state, the transmission state determination unit 34 first determines from the thermal power versus reference infrared intensity relationship information in the storage unit 33. A reference infrared intensity fluctuation amount ΔPs (see FIG. 7), which is a fluctuation amount (difference) in the reference infrared intensity corresponding to the fluctuation of the combustion state from the fire extinguishing state to the ignition state in the ignition thermal power (thermal power 3), is obtained.
Further, infrared intensity detection is performed when the infrared intensity detected by the infrared intensity detecting unit 50 in the fire extinguishing state and the ignition state (when the electromotive force of the flame sensor 9 becomes the reference electromotive force corresponding to the ignition thermal power). The detected infrared intensity fluctuation amount ΔPm, which is the fluctuation amount (difference) with the infrared intensity detected by the unit 50, is obtained. For example, when the infrared transmittance of the infrared transmission window 9 is reduced to 80% of the normal state, the detected infrared intensity fluctuation amount ΔPm is obtained as shown in FIG.
Then, based on the reference infrared intensity fluctuation amount ΔPs and the detected infrared intensity fluctuation amount ΔPm, it is determined whether the infrared transmission state is normal.

Further, when the combustion state discriminating means 35 discriminates the variation in the thermal power of the burner 20, the permeation state judging means 34 is first discriminated by the combustion state discriminating means 35 from the information on the relationship between the thermal power and the reference infrared intensity in the storage unit 33. The reference infrared intensity fluctuation amount ΔPs, which is the fluctuation amount (difference) of the reference infrared intensity corresponding to the fluctuation of the combustion state, is obtained.
Further, a detected infrared intensity fluctuation amount ΔPm, which is a fluctuation amount (difference) between the infrared intensity detected by the infrared intensity detection unit 50 before the thermal power fluctuation and the infrared intensity detected by the infrared intensity detection part 50 after the thermal power fluctuation, Ask for.
Then, based on the reference infrared intensity fluctuation amount ΔPs and the detected infrared intensity fluctuation amount ΔPm, it is determined whether the infrared transmission state is normal.
For example, when the variation of the combustion state of the thermal power from the thermal power 4 to the thermal power 5 is determined, as shown in FIG. 7, the reference infrared intensity variation amount ΔPs is obtained.
For example, when the infrared transmittance of the infrared transmission window 9 is reduced to 80% of the normal state, the detected infrared intensity fluctuation amount ΔPm is obtained as shown in FIG.

  Then, the transmission state determination means 34 is represented by the following formula 1 as a reduction rate Rp of the detected infrared intensity fluctuation amount ΔPm with respect to the reference infrared intensity fluctuation amount ΔPs (corresponding to the degree of reduction, hereinafter referred to as infrared intensity fluctuation amount reduction rate Rp). When the infrared intensity fluctuation reduction rate Rp is larger than the abnormality determination setting value Ka, the infrared transmission state is determined to be abnormal. Incidentally, in this embodiment, the abnormality determination setting value Ka is set to 0.2, for example.

  Rp = (ΔPs−ΔPm) ÷ ΔPs (Equation 1)

In this embodiment, the permeation state determination unit 34 is configured as described above, whereby each of the plurality of combustion states is set as a reference state, and the combustion determined by the combustion state determination unit 35 from the stored information in the storage unit 33. A reference infrared intensity corresponding to the state is obtained, and it is configured to determine whether the infrared transmission state is normal based on the reference infrared intensity and the infrared intensity detected by the infrared intensity detection unit 50. .
Further, when the permeation state determination unit 34 determines the change in the combustion state by the combustion state determination unit 35, the reference according to the change in the combustion state determined by the combustion state determination unit 35 from the stored information of the storage unit 33. A reference infrared intensity fluctuation amount ΔPs that is a fluctuation amount of the infrared intensity is obtained, and the reference infrared intensity fluctuation amount ΔPs and a detected infrared intensity fluctuation amount ΔPm that is a fluctuation amount of the infrared intensity detected by the infrared intensity detection unit 50 are obtained. Based on this, it is configured to determine whether or not the infrared transmission state is normal.

Further, when the permeation state determination unit 34 does not determine the variation of the combustion state by the combustion state determination unit 35 during the determination set time, the operating mechanism 41 of the fuel supply amount adjustment valve 40 is operated to generate the thermal power (that is, The combustion amount is changed and adjusted during the set time for changing the heating power, and then returned to the original heating power.
Specifically, the thermal power is configured to be changed and adjusted in two steps upward or downward.
For example, when the current thermal power is thermal power 1, thermal power 2 and thermal power 3, the thermal power is increased by two stages, and when the current thermal power is thermal power 5 and thermal power 4, the thermal power is decreased by two stages.
Incidentally, the setting time for determination is set to 5 minutes, for example, and the setting time for heating power change is set to a time required for the combustion of the burner 20 to be stabilized with the changed heating power, for example, about 5 seconds.

Next, the temperature calculation means 32 will be described.
In this embodiment, the temperature calculation means 32 determines the temperature of the cooking container N based on the infrared intensity detected by the infrared intensity detection hand 50 and the reference infrared intensity stored in the storage unit 33. It is configured.
Further, the temperature calculation means 32 obtains a plurality of reference infrared intensities corresponding to the two specific wavelength regions from the stored information of the storage unit 33, and the infrared intensity detection unit 50 for the two reference infrared intensities and the two specific wavelength regions. The temperature of the cooking container N is determined based on the two infrared intensities detected at.

  Further, the temperature calculation means 32 is based on the infrared intensity detected by the infrared intensity detector 50 and the reference infrared intensity corresponding to the heating power of the burner 20 detected by the operation position sensor 42 of the fuel supply amount adjustment valve 40. The temperature of the cooking container N is determined.

A process for obtaining the temperature of the cooking container N by the temperature calculation means 32 will be specifically described.
The temperature calculation means 32 obtains the reference infrared intensity corresponding to the thermal power corresponding to the detection information of the operation position sensor 42 for each of the two specific wavelength ranges λ1, λ2 from the thermal power / reference infrared intensity relationship information, and the infrared intensity detection unit 50 Subtracting the reference infrared intensity of each of the two specific wavelength regions λ1 and λ2 from the detected infrared intensity of each of the two specific wavelength regions λ1 and λ2 detected by the above-mentioned, the flame-depleted infrared rays for the two specific wavelength regions λ1 and λ2 The intensity is determined, and the temperature of the cooking container N is detected based on the two flame-depleted infrared intensity.

  FIG. 9 shows the relationship between the temperature of the cooking container N obtained in advance by experiments and the output values (corresponding to the infrared intensity) for each of the two wavelength regions λ1 and λ2 in the infrared intensity detector 50. Incidentally, the relationship shown in FIG. 9 is obtained by using the cooking container N having an emissivity (emissivity) of 0.92 in a normal infrared transmission state of the infrared transmission window 9, and the burner 20 It is the value measured in the state which is not influenced by the flame F.

  FIG. 10 shows the relationship between the temperature of the cooking container N and the output ratio, which is the ratio of the output value corresponding to the wavelength region λ1 and the output value corresponding to the wavelength region λ2 in the infrared intensity detector 50 (hereinafter referred to as temperature). It may be described as the relationship between the intensity ratio to infrared rays). Incidentally, the relationship between the temperature and infrared intensity ratio shown in FIG. 10 is obtained as follows.

That is, for each of the plurality of cooking containers N having different emissivities, the temperature of the cooking container N is varied to a plurality of temperatures, and the output ratio is obtained for each of the plurality of temperatures. Also in this case, it is a value measured in a state where the infrared transmission state of the infrared transmission window 9 is normal and the flame F of the burner 20 is not affected. Based on the data obtained for a plurality of cooking containers N having different emissivities ε, an approximate expression of the relationship between the temperature and the output ratio is obtained, and the obtained approximate expression is used as the relationship between the temperature and the infrared intensity ratio. Yes.
Therefore, the relationship between the temperature-to-infrared intensity ratios of the respective cooking containers N having different emissivities ε can be made into one common temperature-to-infrared intensity ratio relationship. Further, the relationship between the temperature and the infrared intensity ratio as shown in FIG. 10 obtained as described above is stored in the storage unit 33 of the stove controller 30.

  And when measuring the temperature of the cooking container N heated by the burner 20, the temperature calculation means 32 is first the reference | standard according to the thermal power of the burner 30 calculated | required from the detected value of the operation position sensor 42 at that time. The infrared intensity is obtained for each of the two specific wavelength ranges λ1 and λ2 based on the thermal power versus reference infrared intensity relationship information for the two specific wavelength ranges λ1 and λ2 stored in the storage unit 33.

  Next, for each of the output value corresponding to the specific wavelength region λ1 and the output value corresponding to the specific wavelength region λ2 in the infrared intensity detection unit 50, the corresponding reference infrared intensity is subtracted, and the flame attenuation output value (flame component) And the output ratio of the flame attenuation output value is determined, and cooking is performed from the relationship between the output ratio of the flame attenuation output value and the temperature-to-infrared intensity ratio stored in the storage unit 33. The temperature of the container N is obtained. By taking such a ratio of output values, the temperature of the cooking container N can be accurately detected without depending on the emissivity of the cooking container N.

  Further, the temperature calculation means 32 has a case where the infrared intensity fluctuation amount reduction rate Rp (corresponding to the reduction degree) obtained by the transmission state determination means 34 is larger than the correction setting value Kr and not more than the abnormality determination setting value Ka. Is configured to obtain the temperature of the cooking container N in a state of correction based on the infrared intensity variation reduction rate Rp. Incidentally, the correction set value Kr is set to 0.05, for example.

Next, a description will be given of a configuration for obtaining the temperature of the cooking container N in a state where correction is made based on the infrared intensity fluctuation amount reduction rate Rp.
The temperature calculation means 32 corrects the infrared intensity P detected for each of the wavelength regions λ1 and λ2 by the infrared intensity detector 50 based on the infrared intensity fluctuation reduction rate Rp according to the following equation 2, and the corrected infrared intensity Pr Using the corrected infrared ray intensity Pr, the temperature of the cooking container N is obtained as described above.

  Pr = P / (1-Rp) (2)

And in the state where combustion of the burner 20 is confirmed by the flame sensor 5, the combustion control means 31 is based on the temperature of the cooking container N calculated | required by the temperature calculation means 32, and is variously demonstrated as follows. Execute the process.
For example, the combustion control means 31 should adjust the combustion amount of the burner 20 so as to maintain the temperature of the cooking container N at the cooking set temperature based on the temperature of the cooking container N obtained by the temperature calculation means 32. The operation mechanism 41 of the fuel supply amount adjustment valve 40 is controlled.
Further, the combustion control means 31 closes the fuel supply intermittent valve 7 and the fuel supply amount adjustment valve 40 when the temperature of the cooking container N determined by the temperature calculation means 32 becomes higher than the set temperature for overheating prevention, and burner A fire extinguishing process for extinguishing 20 is executed.

Further, when the transmission state determination unit 34 determines that the infrared transmission state is abnormal based on the fact that the infrared intensity variation reduction rate Rp is larger than the abnormality determination setting value Ka, the combustion control unit 31 An abnormality notification process for turning on the notification lamp 10 is executed. As the abnormality notification process, various processes such as a process of sounding the abnormality notification buzzer can be performed in addition to the process of lighting the abnormality notification lamp 10 in this way.
Therefore, the user can easily recognize that the surface of the infrared transmission window 9 has been soiled by the broth spilled from the cooking container N when the abnormality notification lamp 10 is turned on. The cleaning operation is performed so as to remove the dirt attached to the surface of the window 9.

Further, when the infrared intensity fluctuation reduction rate Rp is equal to or greater than the emergency fire extinguishing set value Ks set to a value larger than the abnormality determining set value Ka, the combustion control means 31 and the fuel supply intermittent valve 7 and the fuel supply amount The control valve 40 is closed to perform a fire extinguishing process that extinguishes the burner 20. Incidentally, the emergency fire setting value Ks is set to 0.4, for example.
Accordingly, the heating operation of the burner 3 is continued in a situation where the infrared ray from the cooking container N cannot be detected well by the infrared intensity detection unit 50 because the infrared transmission window 9 is dirty. It is possible to avoid an unfavorable situation such as heating N by mistake.

[Another embodiment]
Next, another embodiment will be described.
(A) In configuring the combustion state determination means 35 to determine the variation of the combustion state of the burner 20, in the above embodiment, the burner is based on the electromotive force of the flame sensor 5 and the thermal power versus reference electromotive force relationship information. The combustion state of the burner 20 is determined based on the presence or absence of an ignition command from the operation unit 3 and the detection information of the operation position sensor 42 of the fuel supply amount adjustment valve 40. It may be configured to discriminate fluctuations. Incidentally, the state where the ignition command is not commanded from the operation unit 3 is determined to be a fire extinguishing state, and the thermal power (combustion amount) of the burner 20 is determined based on the detection information of the operation position sensor 42.

(B) In the above embodiment, the transmission state determination unit 34 is configured to determine whether or not the infrared transmission state is normal when the combustion state determination unit 35 determines a variation in the combustion state. The transmission state determination unit 34 may be configured to determine whether the infrared transmission state is normal in the combustion state determined by the state determination unit 35.
For example, immediately after the container N for cooking at a room temperature or a temperature lower than the room temperature is placed on the Gotoku 2 and the burner 20 is ignited, it is determined whether or not the infrared transmission state is normal.
Further, when the temperature of the cooking container N placed on the Gotoku 2 is normal temperature or lower than normal temperature and the burner 20 is burned with a predetermined heating power, it is determined whether or not the infrared transmission state is normal. Configure to determine. If it does in this way, in the state which suppressed the influence of the infrared rays intensity from the container N for cooking, it can be determined whether an infrared rays transmission state is normal.
Specifically, the reference infrared intensity corresponding to the combustion state determined by the combustion state determination means 35 is obtained from the reference infrared intensity stored in the storage unit 33, and the reference infrared intensity and infrared intensity detection unit 50 obtains the reference infrared intensity. It is configured to determine whether or not the infrared transmission state is normal based on the detected infrared intensity.

(C) In the above embodiment, the fuel supply amount adjustment valve 40 is provided with the operation mechanism 41 so that the operation mechanism 41 can change and adjust the combustion amount (thermal power) of the burner 20 step by step. Such an operation mechanism 41 may be omitted, and a manually operated lever that can continuously change and adjust the opening of the fuel supply amount adjustment valve 40 may be provided. In this case, the reference infrared intensity and the reference electromotive force are stored in the storage unit 33 in association with a continuous change in the combustion amount.

(D) The specific example of the reference state is not limited to the specific example illustrated in the above embodiment, that is, the state in which the combustion state of the burner 20 is the reference state, and the temperature of the cooking container N is the reference. Alternatively, the combustion state of the burner 20 may be a reference state, and the temperature of the cooking container N may be a reference temperature.
For example, as a reference state in which the temperature of the cooking container N is the reference temperature, for example, when the burner 20 is extinguished, normal temperature cooking container N or boiling hot water enters and the temperature is approximately A state where a cooking container N of 100 ° C. is placed on Gotoku 2 can be mentioned.
Moreover, as a reference state in which the combustion state of the burner 20 is the reference state and the temperature of the cooking container N is the reference temperature, for example, the cooking container N at normal temperature or lower than normal temperature is placed on Gotoku 2 And the state immediately after igniting the burner 20 is mentioned.
Then, in such a reference state and in a state where the infrared transmission state of the infrared transmission window 9 is normal, the infrared intensity detected by the infrared intensity detection unit 50 is stored in the storage unit 33 as the reference infrared intensity, Based on the reference infrared intensity and the infrared intensity detected by the infrared intensity detector 50 in the reference state, it is configured to determine whether or not the infrared transmission state of the infrared transmission window 9 is normal.
In the case of such a configuration, it is not necessary to provide the combustion state determination means 35.

(E) In the above embodiment, as the infrared wavelength range for determining whether or not the infrared transmission state is normal, the same wavelength range as that for obtaining the temperature of the cooking container N, that is, the infrared ray emitted from the flame. However, a wavelength region in which the infrared radiation intensity emitted from the flame is larger than the radiation intensity in the other wavelength region may be used. In this case, the infrared intensity detector 50 is configured such that the infrared radiation intensity emitted from the flame is smaller than the radiation intensity in the other wavelength areas, and the infrared radiation intensity emitted from the flames is in the other wavelength areas. Therefore, it is configured to detect the infrared intensity of each specific wavelength region that is larger than the radiation intensity of the.

(F) In the above embodiment, the temperature calculation unit 32 obtains the temperature based on the ratio of the infrared intensity for each of the two specific wavelength ranges. However, instead of such a configuration, the following is obtained. You may comprise.
For example, by using a plurality of cooking containers N having different emissivities in advance, the temperature of the cooking container N is varied to a plurality of temperatures, and the infrared intensity for each of a plurality of specific wavelength ranges is obtained for each of the plurality of temperatures. Measurement is performed, and the infrared intensity for each of the plurality of specific wavelength ranges 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 specific wavelength regions detected by the infrared intensity detection unit 50 is obtained, and the obtained infrared intensity relationship is determined. The corresponding temperature is obtained, and the obtained temperature is set as the temperature of the cooking container N. Incidentally, in this case, the plurality of specific wavelength ranges may be two specific wavelength ranges as in the above embodiment, or may be three or more specific wavelength ranges.

  One wavelength range is set as the specific wavelength range, and the infrared intensity for the specific wavelength range is stored as map data in a state corresponding to a plurality of temperatures, and the map data and the specific wavelength range are stored. It is good also as a structure which calculates | requires the temperature of the container N for cooking from the detected value of the infrared intensity of.

(G) In the case where a plurality of burners 20 are provided on the stove, the infrared transmission window 9 described in the above embodiment, and the incidental devices such as the infrared intensity detection unit 50 and the stove controller 30 are provided for each of the plurality of burners 20. Will be provided.
In this case, the configuration according to the present invention such as the permeation state determination unit 34 and the combustion state determination unit 35 is also provided for each of the plurality of burners 20.

  As described above, it is possible to provide a stove that can reduce the price while appropriately determining whether or not the infrared transmission state of the infrared transmission unit is normal.

1 Top plate 5 Flame sensor (flame detection means)
9 Infrared transmission window (infrared transmission part)
20 Burner 32 Temperature calculation means 33 Storage part (storage means)
34 Permeation state determination means 35 Combustion state determination means 40 Fuel supply amount adjustment valve (combustion amount adjustment means)
41 Operation mechanism (actuator)
50 Infrared intensity detector (Infrared intensity detector)
F Flame N Cooking container

Claims (10)

A top plate having an infrared transmitting portion that can be placed with a cooking container and is made of a light transmitting member and capable of transmitting infrared rays in the vertical direction;
A burner for heating the cooking vessel placed on the top plate;
Infrared intensity detection means installed on the lower side of the top plate so as to detect infrared intensity, which is infrared radiation intensity radiated from the bottom of the cooking container and transmitted through the infrared transmission part,
A stove comprising temperature calculating means for determining the temperature of the cooking container based on the infrared intensity detected by the infrared intensity detecting means,
The infrared intensity detecting means is configured to detect the infrared intensity in a state including infrared rays emitted from a flame formed by the burner and transmitted through the infrared transmitting portion;
In the reference state where the combustion state of the burner is the reference state or the reference container temperature is the reference temperature, and the infrared transmission state of the infrared transmission part is normal, the infrared intensity detecting means Storage means for storing the detected infrared intensity as a reference infrared intensity,
Based on the reference infrared intensity stored in the storage means and the infrared intensity detected by the infrared intensity detection means in the reference state, it is determined whether or not the infrared transmission state of the infrared transmission part is normal. A stove provided with a transmission state determination means. Combustion state determination means is provided for determining which one of a plurality of different combustion states is a combustion state of the burner,
The storage means uses the detection value of the infrared intensity detection means for the infrared rays radiated from the flame and transmitted through the infrared transmission part having the normal infrared transmission state as the reference infrared intensity, and each of the plurality of combustion states. Configured to store in association with each other,
The transmission state determination unit obtains the reference infrared intensity corresponding to the combustion state determined by the combustion state determination unit from the storage information of the storage unit, with each of the plurality of combustion states as the reference state, The stove according to claim 1, wherein the stove is configured to determine whether or not the infrared transmission state is normal based on the reference infrared intensity and the infrared intensity detected by the infrared intensity detecting means. The combustion state determining means is configured to determine that the combustion state of the burner has changed among the plurality of combustion states;
When the permeation state determination unit determines the change in the combustion state by the combustion state determination unit, the permeation state determination unit responds to the change in the combustion state determined by the combustion state determination unit from the stored information of the storage unit. A reference infrared intensity fluctuation amount which is a fluctuation amount of the reference infrared intensity is obtained, and based on the reference infrared intensity fluctuation amount and a detected infrared intensity fluctuation amount which is an infrared intensity fluctuation amount detected by the infrared intensity detecting means. The stove according to claim 2, configured to determine whether or not the infrared transmission state is normal.   The combustion state determining means is configured to determine a variation between a fire extinguishing state where the burner is extinguished and an ignition state where the burner is ignited as a variation in the combustion state. Stove. Combustion amount adjusting means capable of changing and adjusting the combustion amount of the burner as the combustion state is provided,
The combustion state determining means is configured to be able to detect the combustion amount adjusted by the combustion amount adjusting means, and configured to determine a variation in the combustion amount as a variation in the combustion state. 4. The stove according to 4. The combustion amount adjusting means includes an actuator for changing and adjusting the combustion amount;
When the permeation state determination unit does not determine the change in the combustion state by the combustion state determination unit for a set time, the actuator of the combustion amount adjustment unit is operated to change and adjust the combustion amount. The stove according to claim 5, wherein the stove is configured. Flame detection means is provided in contact with the flame, and outputs information according to the temperature of the flame,
The storage means is configured to store output information of the flame detection means as reference output information in association with each of the plurality of combustion states,
The combustion state discriminating unit discriminates whether or not the burner has ignited and the burner combustion amount based on the output information of the flame detecting unit and the reference output information stored in the storage unit. The stove according to any one of claims 3 to 6, wherein the stove is configured to determine a change in a combustion state of the burner. The transmission state determination means obtains a degree of decrease in the detected infrared intensity fluctuation amount with respect to the reference infrared intensity fluctuation amount, and when the reduction degree is larger than a set value for abnormality determination, the infrared transmission state is abnormal. Is configured to determine,
The said temperature calculation means is comprised so that the temperature of the said container for cooking may be calculated | required in the state correct | amended based on the said decreasing degree, when the said decreasing degree is below the setting value for abnormality determination. 8. The stove according to any one of 7 above. The infrared intensity detecting means is configured to detect infrared radiation intensity in a specific wavelength region of infrared rays transmitted through the infrared transmission part as the infrared intensity;
The storage means is configured to store, as the reference infrared intensity, the infrared radiation intensity of the specific wavelength region of the infrared radiation emitted from the flame and transmitted through the infrared transmission part;
The temperature calculating means is configured to determine the temperature of the cooking container based on the infrared intensity detected by the infrared intensity detecting means and the reference infrared intensity,
The stove according to any one of claims 1 to 8, wherein the specific wavelength region is set in a wavelength region in which the radiation intensity of infrared rays emitted from the flame is smaller than the radiation intensity of other wavelength regions. The infrared intensity detection means is configured to detect infrared intensity of each of the plurality of specific wavelength ranges that are different wavelength ranges,
The storage means is configured to store the reference infrared intensity corresponding to each of the plurality of specific wavelength ranges;
The temperature calculation means obtains a plurality of the reference infrared intensities corresponding to the plurality of specific wavelength ranges from the storage information of the storage means, and the infrared intensity for the plurality of reference infrared intensities and the plurality of specific wavelength ranges The stove according to claim 9, wherein the stove is configured to obtain a temperature of the cooking container based on a plurality of infrared intensities detected by the detection means.

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