JP2001343124A - Overheating preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure safety of a heating chamber and improve its handleability. SOLUTION: A temperature sensor 6 is provided in a heating chamber 1 and a gas shut-off temperature is varied by an output therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing overheating of a cooking device using gas as a heat source.

[0002]

2. Description of the Related Art Generally, as a device for preventing heating of a heating chamber such as a grill, a gas supplied to a gas burner is shut off when a cooking time reaches a preset gas shutoff time. Alternatively, the temperature of the heating chamber is detected by a temperature sensor, and when the temperature reaches a preset gas shutoff temperature, the gas is shut off. These are used alone or in combination.

[0003]

However, in the above-described conventional configuration, when the amount of gas supplied to the gas burner is constant and does not change, the internal temperature of the refrigerator depends on the temperature at the time of starting cooking, the size and the number of objects to be heated. The changes are very different. For example, if an object to be heated having a small heat load is cooked in a state in which the gas amount is large, the temperature in the refrigerator rises rapidly, so that the gas reaches the gas cutoff temperature even during the cooking, and the cooking is interrupted.

[0004] In addition, when cooking is performed continuously, there is a problem that the initial temperature in the refrigerator is high and the gas cutoff temperature is easily reached quickly, and the cooking is similarly interrupted. Conversely, when an object to be heated having a large heat load is cooked with a small amount of gas, the temperature rise to a temperature suitable for cooking is slowed, and the quality of the cooking deteriorates. Further, the ignition of the object to be heated is related not only to the temperature but also to the heating time, and if the time is long, the ignition may occur at a lower temperature.

[0005] As described above, there is a demand for an easy-to-use structure for a heating prevention device for a heating chamber such as a grill, such that cooking is not interrupted during actual cooking.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of changing a gas cutoff temperature by changing a temperature of an output of the temperature sensor during cooking for a certain period of time and elapse of time after starting cooking. Thereby varying the gas cutoff temperature.

According to the present invention, selected heating conditions,
Alternatively, safety can be ensured even if the size and the number of objects to be heated vary, and the usability can be improved such that gas is cut off during cooking.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention has a configuration in which the gas cutoff temperature is varied according to the amount of temperature change of the output of the temperature sensor during cooking for a predetermined time, and the temperature of the temperature sensor during cooking is changed. By estimating the heat capacity of the non-heated material from the temperature rise per unit time of output and changing the gas cutoff temperature, the temperature of the heating chamber does not easily reach the gas cutoff temperature even if the object to be heated is small and the number is small. Become.

The invention according to claim 2 of the present invention has a configuration in which the gas cutoff temperature is varied with the passage of time after the start of cooking, and the gas cutoff temperature is increased in a short time after the start of cooking.

After a certain period of time, the object to be heated is small by lowering the gas shut-off temperature, and even when the number is small, the temperature of the heating chamber hardly reaches the gas shut-off temperature.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an overheating prevention device according to an embodiment of the present invention. A gas burner 2 is provided on an upper surface of a heating chamber 1 opened in front of the apparatus. The object to be heated 4 is mounted on the wallet 3 and is taken in and out of the heating chamber 1.
A temperature sensor 6 is provided on the rear wall 5 of the heating chamber,
The temperature output is transmitted to the control unit 7. The supply of gas to the gas burner 2 is configured such that the control unit 7 determines whether the gas amount is to be adjusted and whether or not the gas is shut off.

FIG. 2 shows a time-dependent temperature transition of the heating chamber provided with the overheat prevention device. The horizontal axis represents the time from the start of cooking, and the vertical axis represents the temperature output from the temperature sensor 5. Normally, in the overheat prevention device, the gas cutoff temperature Tc1 is set at about 230 ° C., and when the temperature exceeds this line, the gas is cut off.

Alternatively, a gas shutoff time Pc1 is provided around 25 minutes after the start of cooking, and a gas shutoff time is used when the time is exceeded.

The output curve 9 shows the temperature output when a normal heated object 4 (four saury, etc.) is cooked. With such a size of the non-heated material, the cooking is completed in about 12 minutes after the start, but if left as it is, the temperature continues to rise and if left as it is, the gas cutoff time Pc1 is reached and the gas is cut off. If the gas cutoff time Pc1 is not provided, the object to be heated may be ignited when the temperature output becomes close to 200 ° C. The output curve 10 shows the temperature output when the object to be heated 4 having a small heat capacity (eg, one open aji) is cooked. Since the heat capacity is small, the temperature rises rapidly and reaches the gas cutoff temperature Tc1 in about 8 minutes, and the gas is cut off.
If left as it is, the object to be heated 4 ignites at around 300 ° C.

FIG. 3 shows an output curve 12 showing a temperature output when cooking of a considerably small object 4 to be cooked is started with a large amount of gas, and an output curve 13 showing a temperature output of a normal object to be heated. In the output curve 12, since the heat capacity of the object to be heated is very small, the time required for the temperature output to reach the gas cutoff temperature Tc1 is as short as about 8 minutes, and the cooking is interrupted halfway. Therefore, the temperature rise determination values ΔTj1 and ΔTj2 for a fixed time ΔP from the start of cooking are provided and the temperature rise value is ΔT
If it exceeds j1, the gas cutoff temperature is raised to Tc2. Conversely, when the temperature rise value falls below ΔTj2, the gas cutoff temperature is reduced to Tc3.

When this configuration is applied to the output curve 12, the gas cutoff temperature is raised to Tc2 and the output curve 13
Is cut down to Tc2.

With this configuration, a necessary cooking time can be ensured even in the case of the heated object 2 having a very small heat capacity. Further, when the cooking time is long, it is possible to prevent ignition of the object to be heated at a low temperature or prevent damage to the equipment.

FIG. 4 also shows a considerably small object 4 to be heated.
The output curve 14 shows the temperature output when cooking is started with a large amount of gas, and the output curve 15 shows the temperature output of the object to be heated having a large heat capacity.

Since the output curve 14 also has a very small heat capacity, the time required for the temperature output to reach the gas cutoff temperature Tc1 is as short as about 8 minutes, and cooking is interrupted halfway.

Therefore, the gas cutoff temperature change times Pc1 and Pc2 are set from the start of cooking, and when the cooking time is shorter than Pc1, the gas cutoff temperature is raised to Tc2.

On the other hand, if the cooking time is longer than Pc2,
The gas cutoff temperature is reduced to Tc3.

When this configuration is applied to the output curve 14, the gas cutoff temperature is raised to Tc2, and the output curve 15
The gas shut-off temperature is reduced to Tc3. With this configuration, a necessary cooking time can be ensured even in the case of the heated object 4 having a very small heat capacity.

If the cooking time is long, it is possible to prevent ignition of the object to be heated at a low temperature or to prevent damage to the equipment.

[0025]

As is apparent from the above description, according to the first aspect of the present invention, the object to be heated is small by estimating the non-heated object based on the amount of temperature change in the heating chamber and changing the gas cutoff temperature. Even in this case, it becomes difficult to reach the gas cutoff temperature, and the safety when the heating time is long is also improved.

According to the second aspect of the present invention, the gas cutoff temperature is set high for a short time after the start of cooking. On the other hand, after a certain period of time, by lowering the gas cutoff temperature,
As described above, even when the object to be heated is small, it is difficult to reach the gas cutoff temperature, and the safety when the heating time is long can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heating prevention device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of temperature transition of a heating chamber in a general heating prevention device.

FIG. 3 is a characteristic diagram of a temperature transition of a heating chamber of the heating prevention device according to the embodiment of the present invention.

FIG. 4 is a characteristic diagram of another temperature transition of the heating chamber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 2 Gas burner 3 Squeezer 4 Heated object 6 Temperature sensor 7 Control part 8 Gas control part Tc1 Gas cutoff temperature △ Tj Temperature rise judgment value

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Goo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A heating chamber for storing an object to be heated, a gas burner for heating and cooking the object to be heated, a squeezer for loading and unloading the object to be heated into and out of the heating chamber, and a temperature sensor fixed to the heating chamber. A gas control unit that adjusts or shuts off the gas amount to the gas burner, and a control unit that receives the output of the temperature sensor and controls the gas amount adjustment unit, and the output of the temperature sensor reaches the gas shutoff temperature. In such a case, an overheat prevention device that shuts off gas at the gas control unit and varies a gas shutoff temperature according to a temperature change amount of the temperature output of the temperature sensor for a certain period of time. 2. The overheat prevention device according to claim 1, wherein the gas shut-off temperature is varied according to a lapse of time after the start of cooking.