JP4557733B2 - Stove - Google Patents

Description

The present invention comprises a heating means for heating a heating container for cooking an object to be heated,
Infrared intensity detecting means for detecting infrared intensity for each of a plurality of different wavelength ranges in infrared rays emitted from the heating container;
The present invention relates to a stove provided with temperature deriving means for determining the temperature of the heating container based on the relationship of the infrared intensity for each of the plurality of wavelength ranges detected by the infrared intensity detecting means.

  Such a stove detects the infrared intensity for each of a plurality of different wavelength ranges in the infrared ray radiated from the heating container by the infrared intensity detecting means, and detects the plurality of infrared rays detected by the infrared intensity detecting means by the temperature deriving means. The temperature of the heating container is obtained based on the relationship of the infrared intensity for each of the wavelength ranges, so that the temperature of the heating container can be obtained in a non-contact manner. And the temperature calculated | required in this way is used for the operation control of the heating means for adjustment of the heating temperature of the heating target object in a heating container, prevention of overheating, etc., for example.

And even when heating containers with different emissivities are to be heated by obtaining the temperature of the heating container based on the relationship of the infrared intensity for each of a plurality of wavelength regions, each heating container to be heated The temperature can be determined accurately regardless of the difference in emissivity.
That is, for example, by setting the plurality of wavelength regions as two wavelength regions, and the ratio of the infrared intensity for each of the two wavelength regions as the relationship of the infrared intensity for each of the plurality of wavelength regions, the two wavelengths Since the ratio of the infrared intensity for each region is a function in which only the temperature of the heating container is a variable, the temperature of the heating container can be accurately detected without depending on the emissivity of the heating container. (For example, see Patent Document 1).

In other words, the radiant energy in a specific wavelength range radiated from the heating container is obtained by multiplying the radiant energy of the black body in the specific wavelength range by the emissivity of the heating container.
Therefore, the ratio of the infrared intensity for each of the two wavelength ranges is a function in which the emissivity of the heating container is canceled and only the temperature of the heating container becomes a variable.

  By the way, in such a stove, there are cases in which it is configured to be able to automatically perform cooking such as boiling water, rice cooking, etc., in which the heating object in the heating container is boiled. In the automatic cooking such as the above, it is configured that the heating object in the heating container is estimated to be in a boiling state, and the operation of the heating means after that is controlled.

  In Patent Document 1, the configuration for estimating that the object to be heated in the heating container is in a boiling state is not specifically described, but the temperature obtained by the temperature deriving unit is not described. It is considered that the heating object in the heating container is assumed to be in a boiling state when the boiling temperature or the boiling temperature of the heating object is reached.

JP 2002-340339 A

By the way, the lower the temperature of the heating container, the smaller the radiant energy radiated from the heating container. Therefore, the lower the temperature of the heating container, the lower the temperature of the plurality of wavelength ranges detected by the infrared intensity detecting means. Infrared intensity becomes weaker.
And generally, the heating object which will be in a boiling state in a heating container is water, the boiling temperature of the water is 100 ° C, and the temperature of 100 ° C is the case of cooking fried food or fried food. Radiant energy radiated from a heating container whose temperature is close to the boiling temperature of the object to be heated, since it is considerably lower than the general heating temperature (for example, 180 to 200 ° C.) of the object to be heated Is considerably smaller than the radiant energy radiated from the object to be heated while cooking the fried food or cooking the fried food.

However, conventionally, it is estimated that the heating object in the heating container is in a boiling state based on the temperature obtained by the temperature deriving means being the boiling temperature or the substantially boiling temperature of the heating object. However, as described above, since the radiant energy radiated from the heating container whose temperature is close to the boiling temperature of the object to be heated is small, each of the plurality of wavelength ranges detected by the infrared intensity detecting means. Since the infrared intensity of the light was weak and the SN ratio was small, it was difficult to obtain the temperature of the heating container with high accuracy by the temperature deriving means.
Therefore, in the past, there may be inconveniences that it is estimated that the boiling state is not in the boiling state, or that it is slow to estimate that it is in the boiling state although it has reached the boiling state. There has been a problem that it is difficult to appropriately estimate that the object to be heated in the heating container is in a boiling state.

  This invention is made | formed in view of this situation, The objective is to provide the stove which can estimate appropriately that the heating target object in the container for a heating is a boiling state.

The stove of the present invention comprises a heating means for heating a heating container for cooking an object to be heated,
Infrared intensity detecting means for detecting infrared intensity for each of a plurality of different wavelength ranges in infrared rays emitted from the heating container;
Temperature derivation means for determining the temperature of the heating container based on the relationship of the infrared intensity for each of the plurality of wavelength ranges detected by the infrared intensity detection means,
In the first characteristic configuration, the temperature deriving unit is based on a change state of the infrared intensity in at least one wavelength region among the infrared intensities for each of the plurality of wavelength regions detected by the infrared intensity detecting unit. It is configured to estimate that the object to be heated in the heating container is in a boiling state ,
The temperature deriving means estimates that the heating object is in a boiling state, and among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means, the temperature of the heating container is It is characterized in that it is configured to perform based on the change state of the infrared intensity in the wavelength region where the infrared intensity is the same when they are the same .

  That is, the heating target in the heating container is determined based on the change state of the infrared intensity in at least one of the plurality of wavelength ranges detected by the infrared intensity detecting means by the temperature deriving means. It is estimated that the object is in a boiling state.

That is, in a heating state where the heating means is heated and the heating container is heated, when the heating object in the heating container is in a boiling state, the temperature of the heating object is maintained at the boiling temperature or substantially the boiling temperature. Accordingly, the temperature of the heating container is also kept at the boiling temperature or substantially the boiling temperature of the object to be heated.
Therefore, in the heating state, among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means, the infrared intensity in at least one wavelength range is such that the infrared intensity in at least one wavelength range is in an equilibrium state. It is possible to estimate that the object to be heated in the heating container is in a boiling state based on the intensity change state (change state with time).

And as a change situation of the infrared intensity corresponding to the heating object in the heating container being in a boiling state, for example, the maximum value within a predetermined set time in the infrared intensity detected by the infrared intensity detecting means It is only necessary to detect a change state in which the infrared intensity is in an equilibrium state, for example, the difference between the value and the minimum value is equal to or less than a predetermined set output difference. Even if the energy is small and the infrared intensity detected by the infrared intensity detecting means is weak, it can be accurately detected, while avoiding estimating that it is in a boiling state although it is not in a boiling state, When reaching the boiling state, it can be estimated that the boiling state is reached as soon as possible.
Therefore, it has become possible to provide a stove that can appropriately estimate that the object to be heated in the heating container is in a boiling state.

Further, according to the first characteristic configuration, the infrared intensity when the temperature of the heating container is the same among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means by the temperature deriving means. Based on the change state of the infrared intensity in the largest wavelength region, it is estimated that the heating object is in a boiling state.

That is, in the heating state, out of the infrared intensity for each of a plurality of wavelength ranges detected by the infrared intensity detection means, the infrared intensity in the wavelength range where the infrared intensity is the highest when the temperature of the heating container is the same is Since the amount of change in the infrared intensity with the passage of time is large, it is easy to identify the change state of the infrared intensity.
Therefore, based on the change state of the infrared intensity in the wavelength range where the infrared intensity is the highest when the temperature of the heating container is the same among the infrared intensities detected by the infrared intensity detecting means. By estimating that the object to be heated is in a boiling state, the estimation can be performed more accurately.
Therefore, it has become possible to more appropriately estimate that the object to be heated in the heating container is in a boiling state.

The stove of the present invention includes a heating means for heating a heating container for cooking an object to be heated,
Infrared intensity detecting means for detecting infrared intensity for each of a plurality of different wavelength ranges in infrared rays emitted from the heating container;
Temperature derivation means for determining the temperature of the heating container based on the relationship of the infrared intensity for each of the plurality of wavelength ranges detected by the infrared intensity detection means,
The second characteristic configuration of the previous SL temperature deriving means, the infrared intensity detecting unit of the infrared intensity for the plurality of wavelength bands each detected people at, based on the change status of the infrared intensity of at least one wavelength range The heating object in the heating container is configured to be in a boiling state,
The temperature corresponding to the boiling state among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means is estimated by the temperature deriving means to be in a boiling state. It is characterized in that it is constructed based on the change state of the infrared intensity in the wavelength region where the theoretical radiant energy obtained by Planck's radiation law in FIG.

That is, the heating target in the heating container is determined based on the change state of the infrared intensity in at least one of the plurality of wavelength ranges detected by the infrared intensity detecting means by the temperature deriving means. It is estimated that the object is in a boiling state.
That is, in a heating state where the heating means is heated and the heating container is heated, when the heating object in the heating container is in a boiling state, the temperature of the heating object is maintained at the boiling temperature or substantially the boiling temperature. Accordingly, the temperature of the heating container is also kept at the boiling temperature or substantially the boiling temperature of the object to be heated.
Therefore, in the heating state, among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means, the infrared intensity in at least one wavelength range is such that the infrared intensity in at least one wavelength range is in an equilibrium state. It is possible to estimate that the object to be heated in the heating container is in a boiling state based on the intensity change state (change state with time).
And as a change situation of the infrared intensity corresponding to the heating object in the heating container being in a boiling state, for example, the maximum value within a predetermined set time in the infrared intensity detected by the infrared intensity detecting means It is only necessary to detect a change state in which the infrared intensity is in an equilibrium state, for example, the difference between the value and the minimum value is equal to or less than a predetermined set output difference. Even if the energy is small and the infrared intensity detected by the infrared intensity detecting means is weak, it can be accurately detected, while avoiding estimating that it is in a boiling state although it is not in a boiling state, When reaching the boiling state, it can be estimated that the boiling state is reached as soon as possible.
Therefore, it has become possible to provide a stove that can appropriately estimate that the object to be heated in the heating container is in a boiling state.
Further, according to the second characteristic configuration, of the infrared intensity for each of a plurality of wavelength ranges detected by the infrared intensity detecting means by the temperature deriving means, the plank radiation at a temperature corresponding to the boiling state of the object to be heated. Based on the change in infrared intensity in the wavelength range where the theoretical radiant energy obtained by the law (hereinafter sometimes simply referred to as theoretical radiant energy) is the largest, it is estimated that the heated object is in a boiling state. Done.

That is, the infrared intensity detected by the infrared intensity detecting means is larger in the infrared region of the wavelength region where the theoretical radiant energy at the temperature corresponding to the boiling state of the heated object is larger, and the amount of change in the infrared intensity with the passage of time is larger. Since it is large, it is easy to identify the change state of the infrared intensity.
Therefore, among the infrared intensities for each of the plurality of wavelength regions detected by the infrared intensity detecting means, the change in the infrared intensity in the wavelength region where the theoretical radiant energy is the largest at the temperature corresponding to the boiling state of the object to be heated. Based on this, it is possible to perform the estimation more accurately by estimating that the heating target is in a boiling state.
Therefore, it has become possible to more appropriately estimate that the object to be heated in the heating container is in a boiling state.

The third characteristic configuration, in addition to the configuration of the first or second feature,
The heating means is composed of a burner,
The plurality of wavelength ranges are set in a range where there is no radiation from the flame of the burner in the infrared wavelength range or the radiation intensity is weak.

That is, when the heating means is composed of a burner, the plurality of wavelength ranges are set in a range where there is no radiation from the flame of the burner in the infrared wavelength range or the radiation intensity is weak. The infrared intensity detection means accurately detects the infrared intensity for each of the plurality of wavelength ranges in a state where the influence of infrared rays emitted from the flame is suppressed.
And based on the relationship of the infrared intensity for each of the plurality of wavelength regions detected by the infrared intensity detecting means, the temperature of the heating container is accurately determined while suppressing the influence of the infrared rays from the flame. Can do.
In addition, the heating object in the heating container is based on the change in the infrared intensity of at least one of the plurality of wavelength ranges detected by the infrared intensity detecting means. Can be appropriately estimated by suppressing the influence of infrared rays from the flame.
Therefore, in the stove in which the heating means is composed of a burner, the temperature of the heating container can be accurately detected, and the heating object in the heating container is appropriately estimated to be in a boiling state. Can now.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
As shown in FIG. 1, the stove can place a heating plate N such as a pan for cooking an object to be heated while being spaced above the heating plate 1a and a flat plate 1 having a circular heating port 1a. 5 virtues 2, a burner 30 as a heating means for heating the heating container N placed on the virtues 2, a combustion control section 3 for controlling the operation of the burner 30, and a setting section for setting various cooking 4 etc. are comprised.

The burner 30 is a Bunsen combustion type internal flame type burner. The gas nozzle 31 ejects the fuel gas G supplied through the fuel supply passage 5, the fuel gas G is ejected from the gas nozzle 31, and the fuel gas G The mixing tube 32 to which the combustion air A is supplied by the suction action accompanying the ejection of the gas and the plurality of flame ports 33 for ejecting the air-fuel mixture to the inner peripheral portion are provided, and the air-fuel mixture is supplied from the mixing tube 32. An annular casing member 34 and the like are provided.
The burner 30 is provided below the heating port 1a.

  In the burner 30, the mixture of the fuel gas G and air A supplied from the mixing pipe 32 into the annular casing member 34 is ejected from the flame port 33 toward the center of the annular casing member 34 in a substantially horizontal direction. The mixture of the jetted fuel gas G and air A burns, 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.

  Further, a juice receiving tray 8 for receiving boiled food or the like dropped through the heating port 1a is provided below the annular casing member 34 of the burner 30.

  Further, the stove includes an infrared intensity detector 40 as an infrared intensity detector for detecting infrared intensity in each of two different wavelength ranges in the infrared rays emitted from the heating container N, and the infrared intensity detector 40. Based on the ratio of the infrared intensity for each of the two wavelength ranges detected in (corresponding to the relationship of the infrared intensity for each of the plurality of wavelength ranges, hereinafter may be referred to as the infrared intensity ratio), A temperature deriving unit 50 is provided as temperature deriving means for obtaining the temperature of the heating container N.

  In the present invention, the temperature deriving unit 50 is based on the change state of the infrared intensity in any one of the two wavelength ranges detected by the infrared intensity detecting unit 40. Thus, it is configured to estimate that the object to be heated in the heating container N is in a boiling state.

  The two 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 in the infrared wavelength range.

  The temperature obtained by the temperature deriving unit 50 is output to the combustion control unit 3, and the combustion control unit 3 obtains the temperature obtained by the temperature deriving unit 50 (hereinafter sometimes referred to as a derived temperature). Or by controlling the fuel supply intermittent valve 6, the fuel supply amount adjusting valve 7, etc. based on the boiling state estimation result for estimating that the heating object in the heating container N is in a boiling state. It is configured to perform automatic heating cooking such as a mode, a rice cooking mode, and a fried food mode, automatic temperature control of the heating container N, and emergency stop control when the heating container N is overheated.

First, the infrared intensity detection unit 40 will be described.
As shown in FIG. 2, the infrared intensity detector 40 includes two bandpass filters 41a and 41b having different wavelength ranges of infrared rays to be transmitted, and infrared rays that have passed through the two bandpass filters 41a and 41b. Two infrared detection elements 42a and 42b that are separately detected are provided so as to detect infrared intensities in two different wavelength ranges in the infrared rays emitted from the heating container N. . Incidentally, the bandpass filters 41a and 41b are configured to selectively transmit only infrared rays in a predetermined wavelength region.

In other words, the two infrared detection elements 42a and 42b are arranged side by side in a packaging 43 having a light incident opening 44 so that infrared light incident through the opening 44 can be detected. One band pass filter 41a is provided in a portion where the infrared ray is incident on one infrared detection element 42a in the opening 44, and the other is provided in a portion where the infrared ray is incident on the other infrared detection element 42b in the opening 44. Band-pass filter 41b is provided.
In the packaging 43, a drive unit 45 for driving the two infrared detection 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.

  As shown in FIG. 1, the infrared intensity detection unit 40 configured as described above is disposed below the opening formed in the central portion of the soup pan 8, and the infrared intensity detection unit 40 uses five virtues. 2 is configured to detect the infrared intensity for each of the two wavelength regions in the infrared rays that are radiated from the bottom of the heating container N placed on 2 and pass through the opening of the soup pan 8.

Next, how to set the two wavelength ranges will be described.
FIG. 3 shows the infrared intensity spectrum distribution of the infrared rays 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 wavelength ranges are within the range of 1.5 μm to 1.8 μm, within the range of 2.0 μm to 2.4 μm, within the range of 3.1 μm to 4.2 μm, and 8 By setting within the range of not less than 0.0 μm and not more than 12.0 μm, the two wavelength ranges are set within a range where there is no radiation from the flame of the burner 30 in the infrared wavelength range or the radiation intensity is weak. can do.
In this embodiment, for example, the two wavelength ranges are set to different wavelength ranges within a range of 3.1 μm to 4.2 μm.

Next, the infrared detection elements 42a and 42b will be described.
Infrared detectors 42a and 42b configured using PbS (lead sulfide) or PbSe (lead selenide) as an infrared cell emit infrared rays in the range of 1.5 μm to 5.0 μm at an operating temperature of normal temperature (300K). Further, 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 wavelength ranges are set in the range of 3.1 μm or more and 4.2 μm or less, the infrared detection elements 42a and 42b are made of PbS (lead sulfide) or PbSe (lead selenide). Is preferably used as an infrared cell.

Next, a temperature derivation process for obtaining the temperature of the heating container by the temperature derivation unit 50 will be described. In the following description, the two wavelength regions are denoted by λ1 and λ2. Incidentally, the wavelength region λ2 is longer than the wavelength region λ1.
FIG. 4 shows the relationship between the output value (corresponding to the infrared intensity) and the temperature of the heating container for each of the two wavelength regions λ1 and λ2 in the infrared intensity detector 40 obtained in advance by experiments. Incidentally, the relationship shown in FIG. 4 is obtained by using a heating container having an emissivity of 0.92.
FIG. 5 shows an output ratio (corresponding to the infrared intensity ratio) of the temperature of the heating container and the output value corresponding to the wavelength region λ1 and the output value corresponding to the wavelength region λ2 in the infrared intensity detector 40. (Hereinafter, may be 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 heating containers having different emissivities ε, the temperature of the heating container is varied 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 heating containers 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 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 heating containers N having different emissivities ε can be made into one 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 50.

The temperature deriving unit 50 obtains and stores an output ratio (corresponding to the infrared intensity ratio) between the output value corresponding to the wavelength region λ2 and the output value corresponding to the wavelength region λ1 in the infrared intensity detecting unit 40. The temperature of the heating container N is determined from the relationship between the temperature-to-infrared intensity ratio.
Therefore, the temperature of the heating container N can be accurately detected without depending on the emissivity of the heating container N.

Next, a boiling state estimation process for estimating that the heating object in the heating container N is in a boiling state by the temperature deriving unit 50 will be described.
In this embodiment, the temperature deriving unit 40 estimates that the heating object is in a boiling state, and the infrared intensity for each of the two wavelength ranges detected by the infrared intensity detecting unit 40 is as follows: It is configured so as to be performed based on the change state of the infrared intensity in the wavelength region where the infrared intensity is high when the temperature of the heating container N is the same.

In other words, the relationship between the output value (corresponding to the infrared intensity) for each of the two wavelength regions λ1 and λ2 in the infrared intensity detector 40 and the temperature of the heating container N is as shown in FIG. In some cases, the wavelength region λ2 has a higher infrared intensity when the temperature of the heating container N is the same.
Therefore, the temperature deriving unit 40 is configured to estimate that the heating object is in a boiling state based on the change state of the infrared intensity in the wavelength region λ2 detected by the infrared intensity detecting unit 40. It is.

FIG. 6 shows the change over time in the output value (corresponding to the infrared intensity) of the infrared intensity detector 40 in the wavelength region λ2 during boiling. As shown in FIG. 6, when the water in the heating container N is in a boiling state, the output value of the infrared intensity detection unit 40 (corresponding to the infrared intensity) is in an equilibrium state.
When the output value (corresponding to the infrared intensity) of the infrared intensity detector 40 for the wavelength region λ2 is in an equilibrium state, the temperature detector 40 specifically sets the boiling estimation set time for the output value. When the difference between the maximum value and the minimum value within (for example, 1 second) is equal to or less than the set output difference for boiling estimation, the heating object is estimated to be in a boiling state.

  Although not shown, the setting unit 4 is provided with a hot water mode switch for instructing the hot water mode, a rice mode switch for instructing the rice mode, and a frying mode switch for instructing the frying mode. .

The hot water boiling mode, the rice cooking mode, and the fried food mode will be described.
The boiling water mode includes a boiling water heating mode in which the burner 30 is extinguished after being kept warm for a set time (for example, 5 minutes) after boiling, and a boiling water automatic extinguishing mode in which the burner 30 is extinguished after boiling. Each time the switch is pressed, the hot water heat-retaining mode and the hot water automatic fire extinguishing mode are alternately instructed.

  The combustion control unit 3 ignites the burner 30 when an ignition command is commanded by an ignition switch (not shown) in a state where the hot water heating mode is commanded by the water heater mode switch, and thereafter Until the temperature deriving unit 50 estimates that the fuel is boiling, the opening degree of the fuel supply amount adjusting valve 7 is adjusted so that the burner 30 is burned with a large heating power. If it is estimated that it is in a boiling state, the opening degree of the fuel supply amount adjustment valve 7 is adjusted so that the heating power of the burner 30 is reduced to a small heating power smaller than the large heating power, and then the setting for heat insulation is performed. When time passes, the fuel supply intermittent valve 6 is closed and the burner 30 is extinguished.

  The combustion control unit 3 ignites the burner 30 when an ignition command is commanded by the ignition switch in a state where the boiling water auto switch mode is commanded by the hot water mode switch, and thereafter, Until the derivation unit 50 estimates that the fuel is boiling, the opening of the fuel supply amount adjustment valve 7 is adjusted so that the burner 30 is burned with a large heating power, and the temperature derivation unit 30 boils. When the state is estimated, the fuel supply intermittent valve 6 is closed and the burner 30 is extinguished.

  The combustion control unit 3 ignites the burner 30 when an ignition command is commanded by the ignition switch in a state where the rice cooking mode is commanded by the rice cooking mode switch, and thereafter the temperature deriving unit 50 The fuel supply amount adjustment valve is configured so that the burner 30 is burned with a large heating power until the temperature derived from the temperature deriving unit 50 reaches the set temperature for high heat heating. After adjusting the opening degree of 7 and estimating that it is in the boiling state, when the derived temperature of the temperature deriving unit 50 reaches the set temperature for high heat heating, the fuel is generated so as to reduce the thermal power of the burner 30 to a small thermal power. When the opening degree of the supply amount adjusting valve 7 is adjusted and then the heating stop set time elapses, the fuel supply intermittent valve 6 is closed and the burner 30 is extinguished.

Incidentally, the set temperature for high heat heating is set to a temperature (for example, 125 ° C.) higher than the boiling temperature of water (100 ° C.), and the set time for heating stop is the boiling state of water in the heating container. Is set to a time shorter than the duration of time.
In other words, in the rice cooking mode, the water in the heating container boils, and then the water in the heating container disappears and the boiling is finished, and then the temperature of the heating container rises to the set temperature for high heat heating. Until the temperature of the heating container reaches the setting temperature for the high heat heating, the heating power is changed to a small heating power, and then the burner 30 is extinguished when the heating stop setting time elapses. Heating will end.

In the fried food mode, the heating target temperature can be set in a plurality of stages, and the heating target temperature is changed every time the fried food mode switch is pressed and displayed on a display panel (not shown).
In the fried food mode, the combustion control unit 3 opens the fuel supply amount adjustment valve 7 so that the derived temperature of the temperature deriving unit 50 becomes the heating target temperature set by the fried food mode switch. The heating power of the burner 30 is adjusted by adjusting the degree.

In addition, the combustion control unit 3 is configured to perform manual heating cooking that performs automatic heating cooking such as the water heating mode, the rice cooking mode, and the fried food mode, and the ignition and extinguishing of the burner 30 and the heating power adjustment of the burner 30 by human operation. In either case, the high cut temperature adjustment process is executed.
In this high cut temperature adjustment process, the combustion control unit 3 is configured such that when the derived temperature of the temperature deriving unit 50 reaches a maintenance temperature set to a temperature that is lower than the high cut temperature for preventing overheating by a set temperature difference, When the temperature of the fuel supply amount adjusting valve 7 is adjusted so that the heating power of the burner 30 is adjusted to maintain the derived temperature of 50 at the maintenance temperature, and the derived temperature of the temperature deriving unit 50 reaches the high cut temperature, the burner is adjusted. Extinguish 30.
Incidentally, the normal high cut temperature is set to about 275 ° C., for example.

[Second Embodiment]
Hereinafter, although 2nd Embodiment of this invention is described, in this 2nd Embodiment, since the said boiling state estimation process in the said temperature derivation | leading-out part 50 differs, it has comprised similarly to 1st Embodiment. The description of the same configuration as that of the first embodiment will be omitted, and mainly the configuration different from that of the first embodiment will be described.

  In the second embodiment, the temperature deriving unit 50 uses the infrared intensity for each of the two wavelength ranges detected by the infrared intensity detecting unit 40 to estimate that the heating object is in a boiling state. Among these, it is configured to perform based on a change state of infrared intensity in a wavelength region where the theoretical radiant energy obtained by Planck's radiation law at a temperature corresponding to the boiling state is large.

FIG. 7 shows the theoretical radiant energy of a black body obtained by Planck's radiation law at 100 ° C., 200 ° C., and 300 ° C., respectively.
Similarly to the first embodiment, when the two wavelength regions λ1 and λ2 are set within the range of 3.1 μm to 4.2 μm, if the heating object is water, the boiling of the water The theoretical radiant energy at 100 ° C., which is the temperature, increases as the wavelength of infrared rays increases. Therefore, the theoretical radiant energy is larger in the wavelength region λ2, which is the wavelength region on the longer wavelength side.
Therefore, the temperature deriving unit 50 estimates that the heating target is in a boiling state based on the change state of the infrared intensity with respect to the wavelength region λ2 detected by the infrared intensity detecting unit 40. It is configured.

  As in the first embodiment, the temperature detection unit 40 has an output value (corresponding to the infrared intensity) for the wavelength region λ2 of the infrared intensity detection unit 40 in an equilibrium state. When the difference between the maximum value and the minimum value within the boiling estimation setting time is less than or equal to the boiling estimation setting output difference, the heating object is estimated to be in a boiling state. .

[Another embodiment]
Next, another embodiment will be described.
(B) the temperature derivation unit 50 the temperature deriving processing specific configuration of by the configuration exemplified in the above embodiments, i.e., the temperature of the heating vessel of the infrared intensities of the s the two wavelength regions husband It is not limited to the structure calculated | required based on ratio.
For example, by using a plurality of heating containers having different emissivities in advance, the temperature of the heating container is changed to a plurality of temperatures, and for each of the plurality of temperatures, an infrared intensity for each of the plurality of wavelength ranges is obtained. The infrared intensity for each of the plurality of wavelength ranges thus obtained 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 detection unit 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 heating container.
Incidentally, in this case, the plurality of wavelength ranges may be two wavelength ranges as in the above embodiments, or may be three or more wavelength ranges.

( B ) When the heating means is configured by the burner 30 as in each of the above embodiments, the configuration of the burner 30 is not limited to the configuration illustrated in each of the above embodiments.
For example, the structure provided with the burner casing formed so that the air-fuel mixture may be ejected to the outer peripheral part of the circumferential shape may be used.
In this case, for example, the infrared intensity detection unit 40 is provided on the lateral side of the burner casing, and is configured to detect infrared intensity of infrared rays emitted obliquely downward from the bottom of the heating container N. .

( C ) In each of the above embodiments, the temperature deriving unit 50 is configured separately from the combustion control unit 3, but the temperature deriving unit 50 may be configured using the combustion control unit 3.

( D ) The specific configuration of the heating means is not limited to the burner 30 illustrated in each of the above embodiments. For example, a halogen lamp that emits red heat, a sheathed heater incorporating an electric resistance wire, or You may comprise by electric heating parts, such as a magnetic field generation coil which performs electromagnetic induction heating (usually called "IH").
As described above, when the heating unit is configured by an electric heating unit, the plurality of wavelength ranges detected by the infrared intensity detection unit 40 include CO ₂ and H ₂ O in the air in the infrared wavelength range. If it is set within a range where there is no or weak absorption of infrared rays due to, the temperature of the heating container can be accurately detected without being affected by CO ₂ or H ₂ O in the air.
Incidentally, in the infrared wavelength range, the range of 1.5 μm or more and 1.8 μm or less, the range of 2.1 μm or more and 2.4 μm or less, the range of 3.5 μm or more and 4.2 μm or less, and the range of 9.0 μm or more Also, in the range of 11.5 μm or less, there is no or weak infrared absorption by CO ₂ and H ₂ O in the air, so that the plurality of wavelength ranges are within the range of 1.5 μm to 1.8 μm. It is set within the range of 1 μm or more and 2.4 μm or less, within the range of 3.5 μm or more and 4.2 μm or less, and within the range of 9.0 μm or more and 11.5 μm or less.

Schematic configuration diagram of a stove according to an embodiment Longitudinal cross section of infrared intensity detector Figure showing the infrared radiation intensity spectrum distribution emitted from the flame The figure which shows the relationship between the temperature of the container for heating, and the output of an infrared intensity detection part The figure which shows the relationship between the temperature of the container for heating, and the output ratio of an infrared intensity detection part The figure which shows a time-dependent change of the output of the infrared intensity detection part in a water heater Diagram showing theoretical radiant energy obtained by Planck's radiation law

Explanation of symbols

30 Heating means, burner 40 Infrared intensity detecting means 50 Temperature deriving means N Heating vessel

Claims (3)

A heating means for heating a heating container for cooking an object to be heated;
Infrared intensity detecting means for detecting infrared intensity for each of a plurality of different wavelength ranges in the infrared rays emitted from the heating container;
A stove provided with temperature deriving means for determining the temperature of the heating container based on the relationship of the infrared intensity for each of the plurality of wavelength ranges detected by the infrared intensity detecting means,
The temperature derivation means is based on a change state of the infrared intensity in at least one of the plurality of wavelength ranges detected by the infrared intensity detection means, and changes in the heating container. Configured to infer that the heated object is in a boiling state ,
The temperature deriving means estimates that the heating object is in a boiling state, and among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means, the temperature of the heating container is A stove configured to perform based on a change state of infrared intensity in a wavelength region where the infrared intensity is the same when the same . A heating means for heating a heating container for cooking an object to be heated;
Infrared intensity detecting means for detecting infrared intensity for each of a plurality of different wavelength ranges in infrared rays emitted from the heating container;
A stove provided with temperature deriving means for determining the temperature of the heating container based on the relationship of the infrared intensity for each of the plurality of wavelength ranges detected by the infrared intensity detecting means,
The temperature deriving means, the infrared rays intensity for the plurality of wavelength ranges respectively detected by the previous SL infrared intensity detecting means, based on a change condition of the infrared intensity of at least one wavelength range, wherein the heating vessel Configured to estimate that the heated object is in a boiling state ,
The temperature corresponding to the boiling state among the infrared intensities for each of the plurality of wavelength ranges detected by the infrared intensity detecting means is estimated by the temperature deriving means to be in a boiling state. A stove that is configured to perform based on the change state of the infrared intensity in the wavelength range where the theoretical radiant energy obtained by Planck's radiation law is the largest . The heating means is composed of a burner,
The stove according to claim 1 or 2, wherein the plurality of wavelength ranges are set in a range in which there is no radiation from the flame of the burner in the infrared wavelength range or the radiation intensity is weak .

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