JP5921480B2 - Stove - Google Patents

Description

  The present invention relates to a stove.

  In the gas stove, the controller monitors the detected temperature obtained from the temperature sensor provided on the back of the Gotoku ring, and if the detected temperature is lower than the preset predetermined temperature, the controller determines that the cooking vessel has a small diameter. A structure for switching the flow path of the switching valve to the throttle path side is disclosed. The maximum value of the gas amount is limited by the throttle path, and even if the heating power adjustment lever is in the strong heating power position, the heating power is suppressed and the flame does not overflow outside the cooking container (see Patent Document 1). ).

JP 2006-138597 A

  However, since the pan presence / absence detection switch does not detect the outer diameter of the object to be heated, when the object to be heated is placed in the five virtues, it returns to the heating power before lifting the pot from the low heat state.

  In addition, since the function of igniting at a thermal power position of about a medium fire is not the thermal power control by the outer diameter of the pan, it is conceivable that a flame overflows around the pan in the case of a small-diameter pan.

  Furthermore, in the conventional example according to Patent Document 1 described above, the optical detection means are arranged in a plurality of concentric circles, so that the structure becomes complicated.

  An object of the present invention is to make it possible to determine the size of the outer diameter of an object to be heated with a simple configuration in consideration of the above facts.

The invention (stove) of claim 1 is provided on a burner that generates a combustion flame for heating an object to be heated, and a top plate around the burner, and supports the object to be heated above the burner. And a thermal sensor provided below a radially inner end of the claw of the five victories, a thermal power of the burner, and a detection value of the thermal sensor. And a control unit that determines whether or not the outer diameter of the object to be heated is equal to or greater than a predetermined threshold value.

In the stove according to claim 1, a thermal sensor is provided below the radially inner end of the virgin claw, and based on the burner thermal power and the detected value of the thermal sensor, the control unit It is determined whether or not the outer diameter of the heated object is greater than or equal to a predetermined threshold value.

  There is a correlation between the burner thermal power and the detection value of the thermal sensor. Since how the burner flame spreads varies depending on the outer diameter of the object to be heated, the correlation varies depending on the outer diameter of the object to be heated. Therefore, if this correlation is established in a certain thermal power, it can be determined that the outer diameter of the object to be heated is equal to or greater than the threshold value, and if not, it can be determined that the outer diameter of the object to be heated is less than the threshold value. Thus, the outer diameter of the object to be heated can be determined with a simple configuration in which a heat sensor is added.

  According to a second aspect of the present invention, in the stove according to the first aspect, when the heating power of the burner is x, the detection value of the thermal sensor is y, and a and b are constants, ) Is true, it is determined that the outer diameter of the object to be heated is greater than or equal to the threshold value, and when the expression (1) is false, it is determined that the outer diameter of the object to be heated is less than the threshold value. It is characterized by that.

  y ≧ ax + b (1)

  In the stove according to claim 2, whether the outer diameter of the object to be heated is equal to or larger than a threshold value by using the equation (1) indicating the correlation between the burner thermal power and the detection value of the thermal sensor. It can be determined whether or not.

  According to a third aspect of the present invention, in the stove according to the first or second aspect, the control unit controls the heating power of the burner according to whether the outer diameter of the object to be heated is equal to or larger than the threshold value. It is characterized by adjusting.

  In the stove according to the third aspect, the heating power of the burner can be increased when the outer diameter of the object to be heated is equal to or larger than the threshold value, and the heating power of the burner can be decreased when the outer diameter of the object to be heated is less than the threshold value. For this reason, regardless of whether the outer diameter of the object to be heated is equal to or larger than the threshold value, the heating power of the burner can be set appropriately.

  According to a fourth aspect of the present invention, in the stove according to any one of the first to third aspects, the thermal sensor is arranged at three or more locations around the burner, and the detection value of each thermal sensor is It is characterized by further determining the presence or absence of an abnormal value.

  In the stove described in claim 4, the control unit determines whether or not there is an abnormal value in the detection values of the thermal sensors arranged at three or more locations around the burner. When there is an abnormal value, it can be considered that there is a displacement between the center of the burner and the center of the object to be heated. For this reason, while determining the outer diameter of a to-be-heated object, the position shift of a to-be-heated object can be detected.

  According to a fifth aspect of the present invention, in the heating cooker according to the fourth aspect, the control unit issues a warning when the outer diameter of the object to be heated is less than the threshold value and there is the abnormal value. It is a feature.

  In the stove according to the fifth aspect, a warning can be issued for the positional deviation of the object to be heated. For this reason, the user of the stove can be urged to place the object to be heated at an appropriate position.

According to a sixth aspect of the invention, there is provided a computer comprising: a burner heating power; and detection values of three or more thermal sensors provided below the radially inner end of the five victories around the burner. A step of determining whether or not an outer diameter of the object to be heated is equal to or larger than a predetermined threshold, a step of further determining the presence or absence of an abnormal value in the detection value of each of the thermal sensors, and the abnormality When there is a value, a step of issuing a warning and a step of adjusting a heating power of a burner for heating the object to be heated according to the outer diameter of the object to be heated are executed.

  In the program according to claim 6, by causing the computer to execute each step, the size of the outer diameter of the object to be heated, the warning when there is a positional deviation, and the heating power adjustment of the burner according to the outer diameter of the object to be heated It can be performed.

  As described above, according to the present invention, it is possible to obtain an excellent effect that the outer diameter of an object to be heated can be determined with a simple configuration.

It is a perspective view which shows a stove. It is a perspective view which shows the example by which one heat sensor is arrange | positioned. It is a block diagram which shows the structure of a control part. It is a diagram which shows the correlation with the thermal power of a burner, and the electromotive force of a thermal sensor at the time of using the pan of the outer diameter corresponding to a threshold value. It is a flowchart which shows the flow of a program. It is a perspective view which shows the example by which three heat sensors are arrange | positioned. It is a flowchart which extracts and shows the step in the case of using three thermal sensors.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Stove)
In FIG. 1, the stove 10 which concerns on this embodiment is a gas stove, for example, and has the burner 11, the virtues 30, the heat sensor 21, and the control part 14 (FIG. 3).

  1 and 2, a burner 11 is a device that generates a combustion flame for heating a pan 20 as an example of an object to be heated. A top plate 16 is provided around the burner 11. The thermal power of the burner 11 can be set by a thermal power control valve 24 (FIG. 3). As shown in FIG. 1, the burner 11 has a large flame opening 12 having a large opening area and a small flame opening 13 having a small opening area. The small flame outlet 13 is provided at a position corresponding to claws 41 to 46 of the five virtues 30 described later. Thereby, the overheating of the claws 41 to 46 due to the combustion flame is suppressed. In addition, as shown in FIG. 1, an Si sensor 18 for a cooking oil overheat prevention device is provided at the center of the burner 11. Further, in the vicinity of the burner 11, a heat sensor 19 for the extinction safety device is provided.

  The virtues 30 are provided on the top plate 16 around the burner 11 and have a plurality of claws 41 to 46 for supporting the pan 20 above the burner 11. The five virtues 30 are arranged, for example, concentrically with the center O of the burner 11, for example. As an example, the claws 41 to 46 are provided every 60 ° in the circumferential direction of the burner 11, and extend radially from the center O of the burner 11. As shown in FIG. 2, the tips 48 of the claws 41 to 46 (the radially inner ends of the five virtues 30) are located outside the burner 11.

  1 and 2, the thermal sensor 21 is a temperature sensor provided below the claw 41 of the virtues 30 around the burner 11. Specifically, the thermal sensor 21 is a thermocouple. The detection value of the thermal sensor 21 is a thermoelectromotive force. The thermal sensor 21 is preferably provided directly below the claw 41 of the virtues 30. Since the small flame port 13 of the burner 11 corresponds to the position of the claw 41, the thermal power of the combustion flame is weaker than that of the large flame port 12. When the combustion flame directly hits the claws 41, the combustion flame becomes unstable and the heat is transmitted to the claws 41 (the five virtues 30). As a result, deterioration of the thermal sensor 21 can be suppressed.

  The heat sensor is not limited to one place. As shown in FIG. 6, for example, three heat sensors 21, 22, and 23 may be arranged around the burner 11. The heat sensors 21, 22, and 23 are arranged on a circumference concentric with the center O of the burner 11, for example, every 120 °. The three heat sensors 21, 22, and 23 can detect the outer diameter and position of the pan 20 more accurately. The thermal sensor 22 is disposed below the claw 42 of the virtues 30, and the thermal sensor 23 is disposed below the claw 43.

  The thermal sensors 21, 22, and 23 need only be disposed below any of the claws 41 to 46, and the distance from the center O of the burner 11 may not be constant. Further, more heat sensors may be arranged (not shown).

  In FIG. 3, the control unit 14 is, for example, a computer that determines whether or not the outer diameter of the pan 20 is equal to or larger than a predetermined threshold based on the detection value of the thermal sensor 21. The control unit 14 includes, for example, a CPU 34 (Central Processing Unit), a ROM 35 (Read Only Memory), and a RAM 36 (Random Access Memory). The threshold value for the outer diameter of the pan 20 is, for example, 18 cm. When the outer diameter is less than 18 cm, the flame tends to overflow around the pan, so 18 cm is set as the threshold value. The threshold value may be a numerical value other than 18 cm.

  Specifically, when the thermal power of the burner 11 is x, the detection value (thermal electromotive force) of the thermal sensor 21 is y, and a and b are constants, the control unit 14 determines that the expression (1) is true. When the outer diameter of the pot 20 is determined to be equal to or greater than the threshold value and the expression (1) is false, it is determined that the outer diameter of the pot 20 is less than the threshold value.

  y ≧ ax + b (1)

  Formula (1) is an inequality based on a linear function (y = ax + b) corresponding to the threshold value (18 cm) for the outer diameter of the pan 20. This linear function is indicated by a straight line L in FIG. The case where Formula (1) is true is a case where, for example, when x = A, the thermoelectromotive force y is in the position indicated by a circle. In this case, since the outer diameter of the pan 20 is equal to or greater than the threshold value, the combustion flame spreads widely and the thermoelectromotive force y is increased. On the other hand, the case where Formula (1) is false is a case where, for example, when x = A, the thermoelectromotive force y is at the position of the Δ mark. In this case, since the outer diameter of the pan 20 is less than the threshold value, the combustion flame overflows around the pan 20 and moves upward, and the thermoelectromotive force y is low.

  Moreover, the control part 14 can adjust the thermal power of the burner 11 according to whether the outer diameter of the pan 20 is more than a threshold value. This thermal power adjustment is performed by operating the thermal power control valve 24. The thermal power control valve 24 includes, for example, a latch valve (latch type electromagnetic valve) (not shown). The thermal power control valve 24 is not limited to a specific type. The thermal power adjustment is to adjust the thermal power during normal operation.

  In the position of x = B shown in FIG. 4, the correlation between the thermal power of the burner 11 and the detected value (thermal electromotive force y) of the thermal sensor 21 is the same regardless of the outer diameter of the pan 20. Is the position. Therefore, when the heating power is lowered to x = B, the heating power is appropriate even for the pot 20 having an outer diameter less than the threshold, and the overflow of the combustion flame around the pot 20 can be suppressed.

  When three heat sensors 21, 22, and 23 are used (FIG. 6), the control unit 14 determines whether or not there is an abnormal value in the detection values of the heat sensors 21, 22, and 23. In addition, the control unit 14 issues a warning when the detected value has an abnormal value. For this warning, as shown in FIG. 3, for example, a pan misset alarm 28 is used. When there is the abnormal value, it can be considered that there is a displacement between the center O of the burner 11 (FIGS. 1 and 2) and the center of the pan 20.

(program)
The program according to the present embodiment is a program that controls the stove 10, and causes the control unit 14 (FIG. 3), which is an example of a computer, to execute steps S1, S4, and S5 shown in the flowchart of FIG. It is. FIG. 5 is a flowchart when one heat sensor 21 is used (FIG. 2).

  In the flowchart of FIG. 5, the ignition of the burner 11 and the thermal power adjustment in step S00 are performed before entering step S1. The thermal power at this time is A which is the maximum thermal power, for example. This means that x = A in FIG. Next, in step S01, the presence or absence of the pan 20 on the virtues 30 is detected. This is performed by utilizing the fact that the thermoelectromotive force of the thermal sensor 21 changes depending on the presence or absence of the pan 20 on the virtues 30. Note that step S01 may be omitted.

  In step S1, it is determined whether or not the outer diameter of the pan 20 is equal to or greater than a predetermined threshold based on the detection value (thermoelectromotive force) of one thermal sensor 21. Specifically, in step S11, conditional branching is performed as to whether or not y ≧ ax + b (formula (1)) for the thermal power x of the burner 11 and the detection value (thermoelectromotive force y) of the thermal sensor 21. . The outer diameter of the pan 20 is determined to be greater than or equal to the threshold when the formula (1) is true, and is determined to be less than the threshold when the formula (1) is false.

  The case where the formula (1) is true is a case where the thermoelectromotive force y with respect to the thermal power A is at the position indicated by a circle in FIG. This circle mark is located above the straight line L indicating the linear function of the equation (1). In this case, since the outer diameter of the pan 20 is equal to or greater than the threshold value, the combustion flame spreads greatly, the degree to which the heat sensor 21 is heated is increased, and the thermoelectromotive force y is increased. That is, the thermal power A is appropriate for the outer diameter of the pan 20. Accordingly, the thermal power A is maintained in step S4.

  On the other hand, the case where the formula (1) is false is a case where the thermoelectromotive force y with respect to the thermal power A is at the position of Δ in FIG. This Δ mark is located below the straight line L indicating the linear function of Expression (1). In this case, since the outer diameter of the pan 20 is less than the threshold value, the combustion flame does not spread upward, the degree to which the heat sensor 21 is heated is reduced, and the thermoelectromotive force y is reduced. That is, the thermal power A is excessive with respect to the outer diameter of the pan 20. Therefore, in step S5, the thermal power x of the burner 11 is lowered and adjusted to x = B.

  The position of x = B is a position where the correlation between the thermal power of the burner 11 and the detected value (thermal electromotive force y) of the thermal sensor 21 becomes equal regardless of the outer diameter of the pan 20. Therefore, even if it is a △ mark when x = A, by using a pot 20 of 14 cm, for example, whose outer diameter is below the threshold by lowering the heating power as shown by arrow C up to x = B However, the heating power becomes appropriate, and the overflow of the combustion flame around the pan 20 can be suppressed. Note that when x = A, the mark (circle) indicates that the detected value (thermal electromotive force) of the thermal sensor 21 is the value of the above-mentioned Δ mark even if the thermal power is lowered as indicated by the arrow D up to x = B. It is equivalent to the case.

  Subsequently, it is possible to notify the user that the heating power adjustment has been performed by LED display in step S6 and buzzer notification in step S7. Note that how steps S6 and S7 are performed is arbitrary, and other display means and warning means may be used. Steps S6 and S7 may be omitted.

  Next, when three heat sensors 21, 22, and 23 are used (FIG. 6), step S1 in FIG. 5 is replaced with step S1 shown in FIG. * 1 to 3 shown in FIG. 7 respectively correspond to the positions of * 1 to 3 shown in FIG.

  Referring to the flowchart of FIG. 7, first, in step S12, a conditional branch is performed on whether the thermal power x of the burner 11 and the detected value (thermal electromotive force y1) of the thermal sensor 21 are y1 ≧ ax + b. If the conditional expression in step S12 is true, in step S13, a conditional branch is made as to whether or not y2 ≧ ax + b for the thermal power x and the detected value (thermal electromotive force y2) of the thermal sensor 22. If the conditional expression in step S13 is true, in step S14, a conditional branch is performed as to whether or not y3 ≧ ax + b for the thermal power x and the detected value (thermal electromotive force y3) of the thermal sensor 23. When the conditional expression of step S14 is true, it can be determined that the outer diameter of the pan 20 is equal to or greater than the threshold value, and the detected values of the thermal sensors 21, 22, and 23 have no abnormal value.

  If the conditional expression (y1 ≧ ax + b) in step S12 is false, a conditional branch is performed in step S15 as to whether y2 ≧ ax + b. If the conditional expression in step S15 is false, a conditional branch is performed in step S16 as to whether y3 ≧ ax + b. When the conditional expression of step S16 is false, it can be determined that the outer diameter of the pan 20 is less than the threshold value and the detected values of the thermal sensors 21, 22, and 23 have no abnormal value.

  When each conditional expression becomes false in steps S13 and S14, and when each conditional expression becomes true in steps S15 and S16, the three detected values are above and below the straight line L in FIG. (For example, the position of a circle and the position of a triangle are divided). In this case, in step S2, it is determined that the detected values of the thermal sensors 21, 22, and 23 have an abnormal value. When there is an abnormal value, it can be considered that there is a misalignment between the center O of the burner 11 (FIG. 6) and the center of the pan 20 (the pan is in the wrong set state).

  If the detected values of the thermal sensors 21, 22, and 23 have an abnormal value, a warning is issued in step S3. This warning is performed, for example, by operating a pan missetting alarm 28 (FIG. 3). Upon receiving this warning, the user of the stove 10 can adjust the pan position so that the misalignment of the pan 20 is eliminated. As a result of the adjustment, when there is no abnormal value in the detection values of the thermal sensors 21, 22, and 23, the alarm is canceled in steps S8 and S9. These steps S8 and S9 cancel the operation when the pan error set alarm 28 (FIG. 3) is activated in step S3, but do nothing when the pan error set alarm 28 is not activated. .

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. 1 and 2, the stove 10 according to the present embodiment is controlled according to the above-described program. The flow of control is as described above. By causing the computer to execute each step of the program, it is possible to adjust the heating power of the burner 11 according to the size of the outer diameter of the pan 20, a warning when there is a displacement, and the outer diameter of the pan 20.

  In the stove 10, a thermal sensor 21 is provided below the claw 41 of the virtues 30, and the control unit 14 controls the pot 20 based on the burner thermal power and the detected value (electromotive force) of the thermal sensor 21. It is determined whether or not the outer diameter is greater than or equal to a predetermined threshold value.

  There is a correlation between the thermal power of the burner 11 and the detection value (electromotive force) of the thermal sensor 21. Since the way in which the combustion flame of the burner 11 spreads changes depending on the outer diameter of the pot 20, the correlation changes depending on the outer diameter of the pot 20. When the outer diameter of the pan 20 is large, the combustion flame spreads along the bottom surface of the pan 20, so that the degree to which the heat sensor 21 is heated increases. On the other hand, in a state where the outer diameter of the pan 20 is small and the combustion flame overflows around the pan 20, the combustion flame is directed upward, so that the degree to which the heat sensor 21 is heated becomes small. If this correlation (formula (1)) is established in a certain thermal power, it can be determined that the outer diameter of the pan 20 is greater than or equal to the threshold value, and if not, it can be determined that the outer diameter of the pan 20 is less than the threshold value. . Thus, the size of the outer diameter of the pan 20 can be determined with a simple configuration in which the heat sensor 21 is added.

  When the outer diameter of the pan 20 is equal to or greater than the threshold value, the heating power of the burner can be increased, and when the outer diameter of the pot 20 is less than the threshold value, the heating power of the burner can be decreased. For this reason, regardless of whether or not the outer diameter of the pan 20 is greater than or equal to the threshold value, the heating power of the burner can be set appropriately. Moreover, the overflow of the flame around the pan 20 can be suppressed by this.

  In the state where the pan 20 is lifted from the top of the virtues 30, the detection value (electromotive force) of the heat sensor 21 is lowered, so that it can be detected that the pan is not on the virtues 30.

  For example, when three thermal sensors 21, 22, and 23 are arranged around the burner 11, the control unit 14 determines whether or not the detected value has an abnormal value. When there is an abnormal value, it can be considered that there is a displacement between the center O of the burner 11 and the center of the pan 20. For this reason, while determining the outer diameter of the pan 20, it is possible to detect the positional deviation of the pan 20. A warning can be issued for the misalignment of the pan 20. For this reason, the user of the stove can be urged to place the pan 20 in an appropriate position.

[Other Embodiments]
The article to be heated is not limited to the pan 20 but is a substantially circular cooking utensil in a plan view such as a frying pan, a kettle or the like (not shown).

  Arrangement | positioning of a thermal sensor is not restricted to 1 place or 3 places, 2 places or 4 places or more may be sufficient. The thermal sensor is not limited to a thermocouple, and may be a frame rod, for example.

  Although the control unit 14 is assumed to be a computer that operates according to a program, the present invention is not limited to this, and a logic circuit may be used as appropriate.

  In addition, it is good also as a structure which does not adjust the thermal power of the burner 11 according to the outer diameter of the pan 20. FIG. In the flowchart of FIG. 5, steps S4 to S7 may be omitted as appropriate. Moreover, it is good also as a structure which does not perform discrimination | determination of position shift (pan missetting). A configuration may be adopted in which a misalignment warning is not issued while determining misalignment. In the flowchart of FIG. 7, steps S2, S3, S8, and S9 may be omitted as appropriate.

  Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. .

DESCRIPTION OF SYMBOLS 10 ... Stove, 11 ... Burner, 14 ... Control part, 16 ... Top plate, 19 ... Thermal sensor, 20 ... Pan (object to be heated) 21, 22, 23 ..Thermal sensor, 24 ... Fire power control valve, 30 ... Gotoku, 41 ... Nail, 42 ... Nail, 43 ... Nail, S1 ... Step, S1, S2, S3, S4 , S5 ... step, x ... thermal power, y, y1, y2, y3 ... thermoelectromotive force (detected value)

Claims (6)

A burner that generates a combustion flame for heating an object to be heated;
Gotoku provided on a top plate around the burner and having a plurality of claws for supporting the object to be heated above the burner;
Around the burner, a thermal sensor provided below the radially inner end of the claw of the five virtues,
A control unit for determining whether the outer diameter of the object to be heated is equal to or greater than a predetermined threshold based on the thermal power of the burner and the detection value of the thermal sensor;
Stove with. When the thermal power of the burner is x, the detection value of the thermal sensor is y, and a and b are constants,
When the expression (1) is true, the control unit determines that the outer diameter of the object to be heated is equal to or greater than the threshold value. When the expression (1) is false, the outer diameter of the object to be heated is The stove according to claim 1, wherein the stove is determined to be less than the threshold value.
y ≧ ax + b (1)   The stove according to claim 1 or 2, wherein the control unit adjusts the heating power of the burner according to whether or not the outer diameter of the object to be heated is equal to or greater than the threshold value.   The stove according to any one of claims 1 to 3, wherein the heat sensor is arranged at three or more locations around the burner, and further determines the presence or absence of an abnormal value in the detection value of each of the heat sensors.   The cooking device according to claim 4, wherein the control unit issues a warning when an outer diameter of the object to be heated is less than the threshold value and the abnormal value is present. On the computer,
The outer diameter of the object to be heated is determined in advance based on the thermal power of the burner and the detection values of three or more thermal sensors provided below the inner radial end of the five victories around the burner. Determining whether it is greater than or equal to a given threshold;
Further determining the presence or absence of an abnormal value in the detection value of each of the thermal sensors;
Issuing a warning if there is an abnormal value;
Adjusting the heating power of a burner for heating the object to be heated according to the outer diameter of the object to be heated;
A program for running

Images