JP2001343125A - Overheating preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ignition of a substance to be heated due to the increase of the temperature of a heating chamber. SOLUTION: This overheating preventing device comprises a heating chamber 1 to contain a substance 4 to be heated, a gas burner 2 to heat and cook the substance, a drip bowl 3 taken in and out from the heating chamber 1 with the substance being placed thereon, a temperature sensor 6 fixed at the heating chamber 1, a gas regulation part 8 to regulate a gas amount to the gas burner 2, and a control part 7 to receive an output from the temperature sensor 6 and control the gas regulating part 8. This constitution enables setting of a gas shut-off time by an initial temperature in the heating chamber at the time of starting of cooking and prevention of ignition of the substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device for burning and using gas.

[0002]

2. Description of the Related Art Generally, as a means for preventing overheating of a heating chamber such as a grill, a method of shutting off gas supplied to a gas burner when a cooking time reaches a preset gas shutoff time is used.

[0003]

However, in the above-mentioned conventional configuration, when the amount of gas supplied to the gas burner is constant and does not change, the temperature at the start of cooking, the size of the object to be heated,
The change in the internal temperature varies greatly depending on the quantity. For example, if an object to be heated having a small heat load is cooked in a state of a large amount of gas and is forgotten to be turned off, the inside temperature rises rapidly and the object to be heated is ignited before the gas shutoff time is reached. .
In addition, if cooking is performed continuously, the initial temperature in the refrigerator is high, so that the subject to be heated is ignited quickly.

As described above, a device for preventing overheating of a heating chamber such as a grill is required to prevent ignition of an object to be heated even if the device is left to be turned off.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a gas shut-off time is set based on a temperature output of a temperature sensor at the start of cooking. Further, the gas cutoff time is set based on the amount of temperature change of the temperature output of the temperature sensor within a certain time from the start of cooking. Further, the gas cutoff time is set according to the gas amount at the start of cooking. Further, the gas cutoff time is set according to the number of times of cooking start within a certain time.

According to the above invention, the gas shutoff time can be set by the initial temperature in the heating chamber at the start of cooking, the amount of gas, or the number of times of starting cooking, and ignition of the object to be heated can be prevented. it can.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
The gas shut-off time is set according to the temperature output of the temperature sensor at the start of cooking.If the temperature of the heating chamber is above a certain temperature, the gas cut-off time is set short. Since the setting can be made, it is possible to prevent the temperature of the heating chamber from rising and the ignition of the object to be heated.

According to a second aspect of the present invention, the gas cutoff time is set based on the amount of temperature change of the temperature output of the temperature sensor within a certain time from the start of cooking. Estimate the heat capacity of the object to be heated from the amount of temperature change per unit time of the temperature output, and set the gas cutoff time longer if the temperature rise of the heating chamber is low, and short if the temperature rise is high, to set the ignition temperature range of the object to be heated. Prevent reaching.

According to a third aspect of the present invention, the gas shutoff time is set by the temperature output of the temperature sensor and the gas amount at the start of cooking, and the temperature of the heating chamber at the start of cooking is high and the gas amount is reduced. If the gas is large, set the gas cutoff time short,
If the temperature of the heating chamber is low and the gas amount is small, it is set long to prevent the object to be heated from reaching the ignition temperature range.

According to a fourth aspect of the present invention, the gas cutoff time is set according to the number of times the cooking is started within a predetermined time.
By setting the first gas shut-off time short, the heated object is prevented from reaching the ignition temperature range.

[0011]

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

(Embodiment 1) FIG. 1 is a schematic sectional view of a heating chamber according to Embodiment 1 of the present invention. A gas burner 2 is provided on an upper surface of the heating chamber which is opened in front of the apparatus. The object to be heated 4 is mounted on the ceiling 3 and is put in and out of the heating chamber 1. A temperature sensor 6 is provided on a rear wall 5 of the heating chamber 1, and a temperature output is transmitted to a control unit 7. Gas burner 2
The control of the gas supply and the presence / absence of the cutoff of the gas are determined by the control unit 7, and the gas is controlled by the gas control unit 8.

FIG. 2 shows a heating chamber 1 provided with an overheat prevention device.
5 shows the temperature change over time. The horizontal axis represents the time from the start of cooking, and the vertical axis represents the temperature output from the temperature sensor 6. The output curve 9 shows the temperature output when the object to be heated 4 (four saury, etc.) is cooked at a normal temperature (about 20 ° C.) at the start of cooking. With this size of the object to be heated, cooking is completed in about 12 minutes after the start, but if left undisturbed, the temperature continues to rise, reaches an ignition temperature range of about 270 ° C., and the object to be heated 4 ignites. The inside of the heating chamber 1 is surrounded by a flame. The output curve 10 shows the temperature output when the temperature at the start of preheating or continuous cooking is high (about 100 ° C. or higher). In this case, the time to reach the ignition temperature range is shortened, and the article to be heated 4 ignites quickly.

In order to prevent the above phenomenon, a gas shutoff time change temperature T1 is provided, and if the temperature at the start of cooking is lower than T1, a gas shutoff time P1 is set, and the temperature at the start of cooking is T
If it is 1 or more, the gas can be cut off by setting the gas cutoff time P2, and the ignition of the heated object 4 can be prevented.

(Embodiment 2) FIG. 3 shows an output curve 11 showing a temperature output when an object to be heated 4 having a small heat capacity (eg, one horse mackerel) is cooked. Since the heat capacity is small, the temperature rises rapidly, reaches the ignition temperature range, and the object to be heated 4 ignites. Therefore, a temperature rise determination value ΔT2 for a fixed time ΔP from the start of cooking is provided, and when the temperature rise value exceeds ΔT2, a gas shutoff time P3 with a short gas shutoff time is set to shut off the gas, and The ignition of the heating object 4 can be prevented.

(Embodiment 3) FIG. 4 shows an output curve 12 showing a temperature output when cooking is started for a small object 4 to be heated at a high temperature when the gas amount is large. Output curve 12
Since the heat capacity of the object 4 to be heated is very small as shown in FIG. Therefore, when the temperature at the start of cooking is higher than the gas cutoff time change temperature T1 and the gas amount is large, the gas cutoff time is shortened and the gas cutoff time P4 is set to cut off the gas.
The ignition of the object to be heated 4 is prevented.

The output curve 13 shows the temperature output when the large object 4 to be heated at the start of normal temperature is started with a small amount of gas. As shown in the output curve 13, since the heat capacity of the article 4 to be heated is large, the time required for the temperature output to reach the ignition temperature range becomes as long as about 30 minutes. Therefore, when the temperature at the start of cooking is less than the gas cut-off time change temperature T1 and the gas amount is small, the gas is cut off by setting the gas cut-off time P5 having a long gas cut-off time, assuming the actual cooking time. 4 to prevent ignition.

(Embodiment 4) FIG. 5 shows an output curve 14 showing the temperature output when continuous cooking is performed. When the second cooking is performed continuously after the first cooking is completed, the second cooking starts, the temperature starts to be high, the cooking time of the object to be heated 4 is shortened, and the time to reach the ignition temperature range is also shortened. Therefore,
The number of times of cooking during a certain period of time △ P2 from the start of cooking is measured, and 2
In the case of the first and subsequent times, the gas can be shut off by setting the gas shut-off time P6 shorter than the first gas shut-off time P1, and the ignition of the object to be heated 4 can be prevented.

[0019]

As apparent from the above description, the following effects can be obtained according to the overheat prevention device of the present invention.

According to the first aspect of the present invention, the gas cutoff time is lengthened according to the temperature output of the temperature sensor at the start of cooking,
Alternatively, by setting the length to be short, it is possible to prevent the temperature of the heating chamber from rising and the ignition of the object to be heated.

According to the second aspect of the present invention, it is possible to prevent the ignition of an object to be heated in accordance with a rise in the temperature of the heating chamber by setting the gas cutoff time based on the amount of change in the temperature output of the temperature sensor. it can.

According to the third aspect of the present invention, the ignition of the object to be heated is prevented in accordance with the change in the gas amount by setting the gas cutoff time based on the temperature output of the temperature sensor and the gas amount at the start of cooking. can do.

According to the fourth aspect of the present invention, the number of times of starting cooking within a certain period of time is measured, and the gas cutoff time of the second cooking is set shorter than the gas cutting time of the first cooking. It is possible to prevent ignition of the heated object.

[Brief description of the drawings]

FIG. 1 is a diagram showing the relationship between a heating chamber and a control unit in an overheating prevention device of the present invention.

FIG. 2 is a temperature transition characteristic diagram of a heating chamber of the overheat prevention device according to the first embodiment of the present invention.

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

FIG. 4 is a temperature transition characteristic diagram of a heating chamber of the overheat prevention device according to the third embodiment of the present invention.

FIG. 5 is a temperature transition characteristic diagram of a heating chamber of an overheat prevention device according to a fourth embodiment of the present invention.

[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 T1 Gas cutoff time change temperature P1 Gas cutoff time

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

Claims (4)

[Claims] 1. A heating chamber for accommodating 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 fixed to the heating chamber. A sensor, a gas adjusting unit that adjusts the gas amount to the gas burner, and a control unit that receives the output of the temperature sensor and controls the gas amount adjusting unit, and the temperature output of the temperature sensor at the start of cooking, An overheat prevention device configured to set a gas shutoff time for shutting off a gas in a gas control unit. 2. The overheat prevention device according to claim 1, wherein the gas cutoff time is set based on the amount of temperature change of the temperature output of the temperature sensor within a certain time from the start of cooking. 3. The overheat prevention device according to claim 1, wherein a gas cutoff time is set based on a temperature output and a gas amount of a temperature sensor at the time of starting cooking. 4. According to the number of times of starting cooking within a certain time,
The overheat prevention device according to claim 1, wherein a gas cutoff time is set.