JP4179985B2 - Stove - Google Patents

Description

  The present invention includes a burner that burns gas to heat an object to be heated, a heated object detection unit that detects the presence or absence of the heated object, and the heated object detection unit that detects the heated object when the burner burns. The present invention relates to a stove including a thermal power reduction control unit that executes a thermal power reduction process for reducing the thermal power of the burner when it is detected that there is no combustion.

The stove as described above includes a burner that forms a flame by burning gas, and heats an object to be heated such as a pan or a frying pan with the flame formed by the burner.
Also, as such a stove, when there is no object to be heated by the burner, when a flame is formed by the burner, it is configured to prevent burns, ignition of clothes, etc. due to the flame A stove is known (see, for example, Patent Documents 1 and 2).

  These conventional stoves have, for example, a telescopic structure configured to be movable up and down so that the tip of the temperature sensor is in contact with the bottom of the object to be heated, and the object to be heated is pushed down by being mounted on the virtues. By providing a mechanism and detecting the expansion / contraction state of the expansion / contraction mechanism, the presence / absence of an object to be heated is detected, and when it is detected that there is no object to be heated, a thermal power reduction process that immediately reduces the thermal power of the burner Is configured to run.

  Furthermore, the stove of Patent Document 1 detects that there is no object to be heated when the burner is ignited, assuming that the object to be heated is mounted after the burner is ignited in the above-described thermal power reduction process. In some cases, the burner is extinguished after a predetermined time has elapsed since the ignition.

  Further, the stove of Patent Document 2 detects that there is no object to be heated in the thermal power reduction process as described above, and after reducing the thermal power of the burner, the object to be heated is mounted again, and the object to be heated is When it is detected that there is, the burner's thermal power is increased to the original thermal power before the decrease.

JP-A-8-86445 JP-A-8-303785

  However, in the conventional stove, when it is detected that there is no object to be heated in the thermal power reduction process as described above, the thermal power of the burner is immediately reduced. Even when a heated object such as a frying pan is lifted from the five virtues, it is detected that there is no heated object and the burner's heating power is reduced sequentially. There are cases where it is desired to heat the object to be heated in a state where it is temporarily lifted from the five virtues, but such heating cannot be performed with a conventional stove that performs a thermal power reduction process.

  In the above-mentioned Patent Document 1, in the thermal power reduction process, when it is detected that there is no object to be heated at the time of ignition of the burner, a configuration of a stove that extinguishes the burner after a certain time has elapsed from the time of ignition is disclosed. Since the standard for a certain period of time until the burner is extinguished is the time of ignition, it is not assumed that the object to be heated is temporarily lifted during cooking such as fried food.

  Moreover, in the stove of the said patent document 2, when it detects that a to-be-heated object is mounted again and there exists a to-be-heated object after reducing a thermal power in a thermal-power reduction process, the thermal power of a burner is returned to the original thermal power before a fall. For example, if the operation of lifting the object to be heated is repeated frequently, the size of the flame formed by the burner will change frequently, so the size of the flame will change. Doing so may cause unforeseen burns, ignition of clothes, etc., and may cause incomplete combustion or misfire, leading to a reduction in efficiency.

  In particular, in a stove configured to reduce the burner's thermal power by immediately extinguishing the burner when it is detected that there is no object to be heated as a thermal power reduction process, the burner's ignition and extinguishing are frequently repeated. Therefore, the efficiency is expected to further decrease.

  The present invention has been made in view of the above problems, and an object of the present invention is to execute a thermal power reduction process for reducing the thermal power of the burner when it is detected that there is no object to be heated during combustion by the burner. An object of the present invention is to realize a stove that is excellent in user convenience and can prevent burns due to a flame and ignition of clothes while suppressing a decrease in efficiency.

The first characteristic configuration of the stove according to the present invention for achieving the above object includes a burner that heats an object to be heated by burning gas, an object detection unit that detects the presence or absence of the object to be heated, A stove comprising a thermal power reduction control means for executing a thermal power reduction process for reducing the thermal power of the burner when the heated article detection means detects that the heated object is absent during combustion by a burner,
When the thermal power reduction control means continuously detects that the heated object is not detected by the heated object detection means during combustion by the burner as the thermal power reduction process, the thermal power of the burner is determined. The delay time is configured to be adjustable, the delay time is adjustable , and the delay time is changed for each classification of the object to be heated .

  According to the first characteristic configuration, the thermal power reduction process is executed by the thermal power reduction control means unless the heated object detection means continuously detects that there is no heated object during combustion by the burner for a predetermined delay time. Therefore, when the object to be heated such as a frying pan is temporarily lifted from the burner, the heating of the object to be heated can be continued without lowering the heating power of the burner. Furthermore, when the object to be heated is mounted on the burner again after the object has been lifted until the delay time elapses, cooking is performed with the original heating power without requiring the troublesome work of restoring the heating power. Can continue. Furthermore, since the magnitude of the thermal power does not change frequently, a decrease in efficiency can be suppressed.

  Further, when the delay time has elapsed since the object to be heated is removed from the burner, the heating power reduction process is executed by the heating power reduction control means, so the heating power of the burner on which the object to be heated is not mounted. It is possible to prevent burns caused by the lowered flame and ignition of clothes.

Therefore, according to the present invention, it has been possible to realize a stove that is excellent in user convenience and can prevent burns due to a flame and ignition of clothes while suppressing a decrease in efficiency due to frequent heating power changes.
If the delay time is configured to be adjustable, the frequency of the operation for temporarily lifting the object to be heated, the time for temporarily lifting the object to be heated, and the average time until the user approaches the burner again after removing the pan. The delay time can be adjusted according to the time, etc., and the thermal power reduction process can be executed in accordance with the user's operation and the cooking method of the object to be heated, and the user's convenience can be further improved. .
In addition, the heating power reduction control means is configured to change the delay time for each classification of the object to be heated, so that the object to be heated is temporarily lifted from the burner like boiled food or soup. If it belongs to a category that does not operate very much, the delay time should be relatively short, and if the heated object is removed from the burner, the burner's thermal power will be reduced early and safety will be emphasized. Can do. On the other hand, if the object to be heated belongs to a category that may frequently be temporarily lifted from the burner, such as stir-fried food or pottery, the delay time is relatively long and Immediately when an object is lifted from the burner, the heating power of the burner is not lowered, and even when an object to be heated is mounted on the burner again, cooking with the original heating power can be continued, Emphasis on user convenience.

The second characteristic configuration of the stove according to the present invention comprises a temperature detection means for detecting the temperature of the object to be heated,
The heating power reduction control means is configured to determine the classification of the heated object from the temperature rise state of the heated object detected by the temperature detecting means during combustion by the burner.

According to the second characteristic configuration, in the case where the thermal power reduction control unit is configured to change the delay time for each classification of the object to be heated, the thermal power reduction control unit is configured to perform the combustion by the burner. The classification to which the heated object belongs can be determined from the temperature rise state of the heated object detected by the temperature detecting means. That is, in the temperature rise state of the heated object, for example, when there is a temperature equilibrium point where the temperature does not further increase at about 100 ° C., the heated object is temporarily lifted from the burner like boiled food or soup If the temperature equilibrium point does not exist, the heated object is temporarily lifted from the burner like a stir-fried dish or a grilled dish. It can be determined that it belongs to a classification that may be frequently performed.

A third characteristic configuration of the stove according to the present invention is configured such that the thermal power reduction control means reduces the thermal power of the burner by reducing the thermal power of the burner to a small fire state as the thermal power reduction process. There is in point.

According to the third characteristic configuration, the heating power reduction control means extinguishes the burner when the heated object detection means continuously detects that there is no heated object during combustion by the burner for a predetermined delay time. However, by reducing the heating power of the burner to a small fire state smaller than the original heating power, the next time the object to be heated is mounted on the burner, cooking can be continued without having to ignite the burner again.

According to a fourth characteristic configuration of the stove according to the present invention, the thermal power reduction control means extinguishes the burner after the thermal power of the burner is once reduced to a small fire state and maintained for a certain time as the thermal power reduction process. By doing so, the burning power of the burner is reduced.

According to the fourth characteristic configuration, when the heating power reduction control unit continuously detects that there is no heated object by the heated object detection unit during combustion by the burner, the burner is immediately extinguished. First, after the burner's thermal power is reduced to a small fire condition, the burner is extinguished so that when the heated object is mounted on the burner in the small fire condition, there is no need to ignite the burner again. Cooking can be continued and the efficiency of use can be improved while the burner is frequently ignited and extinguished. Furthermore, when the object to be heated is not mounted in the small fire state, the burner can be extinguished to sufficiently prevent burns from being caused by a flame or ignition of clothes.

According to a fifth characteristic configuration of the stove according to the present invention, the heated object detection means detects that the heated object is present when the thermal power reduction control means reduces the thermal power of the burner by the thermal power reduction process. In this case, the burner is configured to maintain the thermal power of the burner at the current thermal power.

According to the fifth characteristic configuration, when the thermal power reduction control means detects that the heated object is present by the heated object detection means when the thermal power of the burner is reduced by the thermal power reduction process, By maintaining the thermal power at the current thermal power, when an object to be heated is mounted on the burner during the thermal power reduction process, the burner's thermal power unexpectedly rises, preventing burns, ignition of clothes, etc. can do.

According to a sixth characteristic configuration of the stove according to the present invention, when the heating power reduction control unit detects that the heated object is not detected by the heated object detection unit when the burner is ignited, the heated object detection is performed later. The heating power reduction process is executed after the means detects that the object to be heated is present.

According to the sixth feature, when the heating power reduction control means detects that there is no object to be heated by the object to be heated detection means when the burner is ignited, there is an object to be heated later by the object to be heated detection means. When the object to be heated is not mounted on the burner and the burner is ignited, the object to be heated is mounted on the burner later. Until, the burner's heating power can be maintained until the object to be heated is mounted without automatically reducing the heating power of the burner. In addition, after the object to be heated is once mounted on the burner, for example, when there is no object to be heated by the object to be heated detection means, for example, when a predetermined delay time is continuously detected, a thermal power reduction process for reducing the thermal power of the burner. To prevent burns and ignition of clothes.

An embodiment of a stove according to the present invention will be described with reference to the drawings.
A stove 100 shown in FIG. 1 can be mounted with a top plate 1 having a flat upper surface, a heating port 2 provided on the top plate 1, and a heated object N such as a pan separated from the heating port 2. The burner 3 for burning the fuel gas G and forming a flame upward from the heating port 2 to heat the article N to be heated is provided.

The burner 3 is a Bunsen combustion type burner, and a gas nozzle 6 for injecting the fuel gas G, and a mixing tube in which a mixture of the fuel gas G and air is supplied by the injection of the fuel gas G from the gas nozzle 6 5, an annular casing member 9 provided below the heating port 2 and supplied with air-fuel mixture, and an annular inner surface of the annular casing member 9. The air-fuel mixture is jetted inward and burned. A plurality of flame outlets 7 are provided.
Of course, the burner 3 may be configured so that the air-fuel mixture is ejected outward and burned.

The stove 100 further includes an adjustment valve 22 that can adjust the flow rate of the fuel gas G supplied to the gas nozzle 6, a shut-off valve 23 that can shut off the supply of the fuel gas G to the gas nozzle 6, and the adjustment valve 22 and A control device 20 is provided for controlling the operation of the shut-off valve 23 and the like to ignite and extinguish the burner 3, adjust the fuel amount of the burner 3, and the like.
The control unit 20 is also configured to function as a thermal power reduction control unit 21 that executes a thermal power reduction process described later.

In addition, a juice tray 8 for receiving boiled spilled etc. that has dropped through the heating port 2 is provided below the annular casing member 9 of the burner 3, and the juice tray 8 extends and contracts in the vertical direction. A flexible expansion / contraction mechanism 10 is provided.
The telescopic mechanism 10 is fixed to the juice receiving tray 8 at one end, and when the heated object N on the virtues 4 is not mounted, the other end side is more horizontal than the horizontal plane on which the heated objects N of the virtues 4 are mounted. When the heated object N is mounted on the virtues 4 in a protruding extended state, the other end is in a contracted state where the bottom of the heated object N is pushed down to the same position as the horizontal plane on which the heated object N is mounted. It is configured.

  The expansion / contraction mechanism unit 10 is provided with a contact-type temperature sensor 12 as a temperature detection unit that detects the temperature of the object to be heated N at an end that contacts the bottom of the object to be heated N.

  Further, the expansion / contraction mechanism section 10 is turned on when the object to be heated N is mounted on the virtues 4 and the expansion / contraction mechanism section 10 is in a contracted state as a detection target for detecting the presence or absence of the object to be heated N. When the microswitch 11 is in the on state, the control device 20 can recognize that the heated object N is present on the virtues 4 when the microswitch 11 is in the on state, and when the microswitch 11 is in the off state. It can be recognized that there is no object to be heated N on Gotoku 4.

  The thermal power reduction control means 21, which functions as the control means 20, opens the regulating valve 22 when it is detected by the detection signal from the microswitch 11 that the heated object N is not on the virtues 4 during combustion by the burner 3. It is configured to execute a thermal power reduction process for reducing the thermal power of the burner 3 by reducing the degree.

Hereinafter, the detailed configuration of the thermal power reduction control means 21 will be described.
The above-described thermal power reduction control means 21 reduces the flow rate of the fuel gas G supplied to the burner 3 by the regulating valve 22 when it is detected that the microswitch 11 is off and there is no object to be heated N during combustion by the burner 3. By doing so, the thermal power of the burner 3 is reduced to perform a thermal power reduction process for preventing burns, ignition of clothes, and the like.

  The thermal power reduction control means 21 may be configured to immediately extinguish the burner 3 when the thermal power of the burner 3 is reduced. However, as shown in FIG. Thus, the flow rate of the fuel gas G supplied to the burner 3 is reduced to a small value, and the heating power of the burner 3 is once reduced to a small fire state. It is configured as follows. By reducing the heating power of the burner 3 in this way, when the object N to be heated is mounted on the virtues 4 again in the small fire state, cooking is continued without having to ignite the burner 3 again. Further, when the heated object N is not mounted in the small fire state, the burner 3 can be extinguished to sufficiently prevent burns from being burned or ignition of clothes.

  In this way, when the thermal power of the burner 3 is reduced to a small fire state as the thermal power reduction process, in order to further suppress the point fire extinguishing of the burner 3, the burner 3 is not fired after that, You may comprise so that it may be maintained.

  Further, as shown in FIG. 3, as the thermal power reduction process 21, the thermal power reduction control means 21 is configured such that an elapsed time T after the microswitch 11 is turned off during combustion by the burner 3 is a predetermined delay time T ′. Until it becomes (step # 2), when it is continuously detected that the heated object N is not present when the micro switch 11 is off (step # 1), the flow rate of the fuel gas G supplied to the burner 3 by the adjusting valve 22 is changed. By reducing the thermal power of the burner 3 by lowering (step # 3), while suppressing the efficiency of the burner 3 due to frequent changes in the size of the thermal power, burns due to flames, ignition of clothes, etc. Is configured to prevent.

  In step # 3, as described above, the thermal power lowering control means 21 is configured to extinguish the burner 3 after once reducing the thermal power of the burner 3 to a small fire state and maintaining the small fire state for a certain time T1. The burner 3 is configured to reduce the heating power of the burner 3 when it is detected that there is no object to be heated N for a predetermined delay time T ′, but the burner 3 is extinguished immediately or the burner 3 is It may be configured to reduce the heating power of the burner 3 when it is detected that there is no object to be heated N for a predetermined delay time T ′ in a form in which the heating power is set to a small fire state without extinguishing the fire. .

  The delay time T ′ may be a constant value of, for example, about 5 to 10 seconds. However, the delay time T ′ is configured to be adjustable, and can be used for the user's operation and the cooking method of the object N to be heated. In addition, the thermal power reduction process is executed to further improve the user-friendliness.

Furthermore, the thermal power reduction control means 21 is configured to change the delay time T ′ for each classification of the object N to be heated.
Specifically, as shown in FIG. 4, for example, when it is determined by the classification determination process described later that the user is cooking the heated object N belonging to the category such as boiled food or soup (step # 11). The delay time T ′ is set to a relatively short value Ta ′ of about 1 or 2 seconds (step # 12), assuming that the operation of temporarily lifting the object N to be heated is hardly performed. When the object N is removed from the top of the virtues 4, the fire power of the burner 3 is lowered early so that safety is emphasized.
On the other hand, when it is determined by the classification determination process described later (step # 11) that the user is cooking the heated object N belonging to the classification such as stir-fried foods and grilled foods other than the above-mentioned stewed food and soup. Since the operation of lifting the object N to be heated may be frequently performed, the delay time T ′ is set to a relatively long value Tb ′ of about 5 to 10 seconds (step # 13). Immediately when the heated object N is lifted from the top of the virtues 4, the heating power of the burner 3 is not lowered and cooking with the original heating power is continued even when the heated object N is mounted on the burner 3 again. It is configured so that user convenience is emphasized.

  When the classification determination process is further described, the thermal power reduction control means 21 detects the temperature of the object to be heated N for a certain time by the temperature sensor 12 during combustion by the burner 3, and the temperature increase state of the object to be heated N is determined. For example, when there is a temperature limit point where the temperature does not increase any more around 100 ° C., for example, it is determined that the object to be heated N belongs to a category such as boiled food or soup, while there is no such temperature limit point Is configured to determine that the object N to be heated belongs to a classification such as stir-fried food or pottery, and can determine the classification to which the object N to be heated belongs without requiring a user input operation. it can.

  Further, as shown in FIG. 5, when the user ignites the burner 3, the thermal power reduction control means 21 detects that there is no object to be heated N when the microswitch 11 is off (step S1). # 21) The heating power of the burner 3 is not automatically reduced until the heated object N is mounted on the Gotoku 4 later, but the thermal power of the burner 3 is maintained until the heated object N is mounted. After the micro switch 11 is turned on and it is detected that there is an object to be heated N, the above-described classification determination process (step # 22) and thermal power reduction process (step # 23) are executed.

  Further, as shown in FIG. 6, when the user ignites the burner 3, the thermal power reduction control means 21 detects that there is no object to be heated N when the micro switch 11 is in an off state (step S1). # 31), for example, when the constant elapsed time To ′ from the ignition of the burner 3 such as 1 minute is set as the delay time T ′, and it is continuously detected that the heated object N is not present, the elapsed time To ′. The thermal power reduction process (step # 34) may be executed in a form in which the thermal power of 3 is reduced. In this case, when it is detected in step # 31 that the object to be heated N is present, normal classification determination processing (step # 33) and thermal power reduction processing (step # 34) are executed.

[Another embodiment]
(1) In the above embodiment, the micro switch 11 that is turned on when the heated object N is mounted on the burner 3 and the expansion / contraction mechanism unit 10 is in the contracted state is provided as the heated object detecting means. However, an object detection means having a different configuration may be provided. For example, the heated object detection means is constituted by an infrared sensor that detects the shielding or reflection of light such as infrared rays by the heated object N mounted on the burner 3, or the heated object N on the burner 3 by image processing. Can be configured to detect the presence of.

(2) In the above embodiment, the contact temperature sensor 12 is provided at the tip of the expansion / contraction mechanism 10 as the temperature detection means for detecting the temperature of the object N to be heated. You may comprise in a non-contact type so that the temperature of the to-be-heated material N may be detected by processing the infrared rays reflected by the heated material N.

( 3 ) In the above embodiment, depending on the temperature rise state of the heated object N detected by the temperature sensor 12 in step # 11 of FIG. However, it is configured so that the user can input which class N to be heated is to be heated, and the input can be performed by the input. The classification to which the heated object N belongs may be determined.

Schematic configuration diagram of the stove Graph showing thermal power drop state Flow chart showing the processing flow of thermal power reduction processing Flow chart showing the processing flow of classification judgment processing Flow chart showing process flow at ignition Flow chart showing another form of processing flow during ignition

Explanation of symbols

3: Burner 4: Gotoku 10: Telescopic mechanism 11: Micro switch (object to be heated detection means)
12: Temperature sensor (temperature detection means)
20: Control device 21: Thermal power reduction control means 22: Control valve 100: Stove N: Object to be heated

Claims (6)

A burner that burns gas to heat the object to be heated, a heated object detection means that detects the presence or absence of the object to be heated, and that there is no object to be heated by the heated object detection means during combustion by the burner. A stove comprising thermal power reduction control means for executing a thermal power reduction process for reducing the thermal power of the burner when detected,
When the thermal power reduction control means continuously detects that the heated object is not detected by the heated object detection means during combustion by the burner as the thermal power reduction process, the thermal power of the burner is determined. A stove that is configured to reduce the delay time and is configured to be adjustable , and configured to change the delay time for each classification of the object to be heated . A temperature detecting means for detecting the temperature of the object to be heated;
The said thermal power reduction | decrease control means is comprised so that the classification | category of the said to-be-heated material may be determined from the temperature rise state of the to-be-heated material detected by the said temperature detection means at the time of the combustion by the said burner . Stove. The stove according to claim 1 or 2, wherein the thermal power reduction control means is configured to reduce the thermal power of the burner by reducing the thermal power of the burner to a small fire state as the thermal power reduction process . The thermal power reduction control means reduces the thermal power of the burner by extinguishing the burner after the thermal power of the burner is once reduced to a small fire state and maintained for a certain period of time as the thermal power reduction process. The stove according to claim 1 or 2, wherein the stove is configured as described above. When the thermal power reduction control means detects that the heated object is present by the heated object detection means when the thermal power of the burner is reduced by the thermal power reduction process, the thermal power of the burner is The stove according to any one of claims 1 to 4 , wherein the stove is configured so as to be maintained at a heating power of 1 to 4 . When the heating power reduction control means detects that the object to be heated is absent by the object detection means when the burner is ignited, the object detection means detects that the object to be heated is present later. The stove according to any one of claims 1 to 5, wherein the stove is configured to execute the thermal power reduction process .

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