JP2003299580A - Grill safety device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grill safety device capable of detecting the deterioration of a thermistor and assuring a safety characteristic. <P>SOLUTION: A grill has, in a grill chamber 1, a burning net 2 on which an article to be cooked is placed and a burner 4 for heating and burning the article to be cooked. In this case, a thermistor 11 for detecting a temperature in the grill chamber 1 is installed near an exhausting port 6 of the grill chamber, and at the same time, there are provided a plurality of thermistors 11 at a position above the burning net 2 and a position below the burning net 2 in an upward or downward orientation. A detected temperature of the thermistor 11 located at the position above the burning net 2 is compared with a detected temperature of the thermistor 11 located at the position below the burning net 2, and when the thermistor positioned at the higher location than the burning net 2 detects an abnormal low temperature, the higher located thermistor 11 is deteriorated and it is judged that it is not safe and a safety device is operated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a grill, and more particularly, to a structure for ensuring safety when a thermistor for detecting the temperature inside the grill is deteriorated by a predetermined amount or more.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a general grill. A grill 2 on which an object to be cooked, such as a fish, is placed is installed in the grill chamber 1, and a grill tray 3 is arranged below the grill 2 on the bottom surface of the grill chamber 1. The grill of this example is a double-sided heating type that heats from both the upper and lower sides, and the burner 4 is composed of an upper burner 4a and a lower burner 4b.
An upper burner 4a is mounted on the upper portion of the grill chamber 1, and lower burners 4b are mounted on both lower sides of the grill chamber 1.
A door 5 for opening and closing the front opening is attached to the front opening of the grill room 1 so as to be openable and closable, and an exhaust port 6 is provided at the rear of the grill room 1.
The exhaust pipe 7 is led out from the exhaust port 6.

Fuel gas can be supplied to the upper burner 4a and the lower burner 4b through a gas passage 8.
A safety valve 9 for interrupting the supply of the fuel gas at the time of abnormality is arranged in the middle of the gas path 8. This safety valve 9 is a control circuit 1
The safety valve 9 can be shut off in the event of an abnormality. This safety valve 9 is designed to be manually opened when the instrument plug switch is pushed to "on" to use the grill. Further, an igniter for igniting the upper burner 4a and the lower burner 4b and a thermocouple for detecting combustion of the upper burner 4a and the lower burner 4b are arranged in the grill chamber 1, and the igniter and the thermocouple are connected to the control circuit 10. It is connected.

A thermistor 11 for detecting the temperature in the grill chamber 1 is arranged near the exhaust port 6 at the rear of the grill chamber 1. A plurality of thermistors 11 are arranged one above the other, and are composed of, for example, an upper thermistor 11a located above the grill 2 and a lower thermistor 11b located below the grill 2. The thermistor 11 is a negative characteristic thermistor, and its resistance decreases as the temperature rises, and the temperature can be detected by the change in the resistance. The thermistor 11 is connected to the control circuit 10, and the temperature detected by the thermistor 11 is input to the control circuit 10.

The operation of the grill configured as described above is shown in FIG.
The flowchart is as follows. When you press the ignition / extinguishing button to ignite, the instrument plug switch turns on,
The igniter switch is turned on, the safety valve 9 is manually opened, the igniter is turned on, the battery voltage of the power supply is detected as "OK", and the safety valve drive circuit is "normal" or the thermocouple circuit is "normal". Is determined and "NO"
Then, the buzzer informs the user, and when the ignition / extinguishing button is pressed and released, the instrument plug switch is turned off. In this state, the user removes the cause and reuses. If the battery voltage of the power supply is “OK”, the safety valve drive circuit is “normal”, or the thermocouple circuit is “normal”, “YES” is determined, the thermocouple output is determined to be a normal value, and the safety valve holding current is “normal”. The safety valve 9 is kept open by turning on. When the ignition / extinguishing button is released in this state, the igniter switch is turned off and the igniter is turned off. In this state, if the voltage of the battery as the power source is detected as "OK" and the operation of the safety device is not detected, the burner 4 continues to burn. When the safety device operates, the safety valve holding current becomes "OFF" and the safety valve 9 is "closed" and a buzzer alerts the user. When the ignition / fire extinguishing button is pressed and released, the instrument plug switch is turned "off". In this state, the user removes the cause and reuses. The safety device operates as a grill overheat prevention device operation (when the temperature in the grill chamber 1 is detected and the temperature in the grill chamber 1 is overheated to an abnormal temperature), an extinguishing safety device operation (with a thermocouple). Operation when a misfire is detected), upper thermistor 11a is abnormal (open, short), lower thermistor 11b is abnormal (open, short), electrical circuit board abnormality, safety valve drive circuit abnormality, thermocouple circuit abnormality, etc. .

[0006]

In the above-mentioned grill, the temperature is detected by the thermistor 11 so that the grill chamber 1
When the inside is abnormally overheated, the supply of gas is shut off. However, in order to improve the accuracy of detecting the temperature of the cooking target being baked, the position of the thermistor 11 is set to the cooking target. Must be provided on top of. That is, it is necessary to provide the thermistor 11 located at the upper part like the upper thermistor 11a. However, if an object to be cooked, such as a fish, ignites for some reason, the thermistor 11 is exposed to a high temperature exceeding the heat resistant temperature, and the thermistor 1
1 deteriorates (when the resistance value does not reach the resistance value detected at the time of open failure because it is broken halfway), the temperature cannot be accurately detected, and the safety device does not operate even when abnormal overheating occurs. As described above, the safety device operates when the thermistor 11 is open or short-circuited abnormally, but the safety device does not operate only when it is exposed to a temperature exceeding the heat resistant temperature and deteriorates and the temperature cannot be accurately detected. There is a problem.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a grill safety device capable of detecting deterioration of a thermistor and ensuring safety.

[0008]

SUMMARY OF THE INVENTION A safety device for a grill according to the present invention for solving the above-mentioned problems includes a grill chamber 1 for placing an object to be cooked and a burner 4 for heating and baking the object to be cooked. In the grill provided inside, a thermistor 11 for detecting the temperature in the grill chamber 1 is provided near the exhaust port 6 of the grill chamber 1 and at a position above the grill 2 and below the grill 2. A plurality of thermistors 11 are provided above and below so that the thermistors 11 are located respectively, and the grill 2
When the temperature detected by the thermistor 11 located above is compared with the temperature detected by the thermistor 11 located below the grill 2, the upper thermistor 11 detects the abnormal low temperature and the upper temperature is detected. It is characterized in that the mister 11 is deteriorated and judged to be unsafe, and the safety device is operated.

The resistance value of the thermistor 11 decreases as the temperature rises, and the temperature is detected by the change in the resistance value. The thermistor 11 located above the grill 2
Is prone to deterioration due to exposure to high temperatures due to ignition of the burned material (the resistance value of the thermistor 11 increases when the high temperature state continues for a long time), and when deterioration deteriorates, the resistance value increases and the temperature is lower than the actual temperature. Will come to detect. Then grill 2
When the temperature detected by the thermistor 11 located above is compared with the temperature detected by the thermistor 11 located below the grill 2, when the detected temperature of the thermistor located above becomes abnormally low The thermistor 11 can be judged to be deteriorated and the safety device can be operated. As a result, it is possible to detect the deterioration of the thermistor 11 located above and secure the safety.

It is also preferable that at least one thermistor 11 determines that the thermistor 11 has deteriorated when it detects a temperature below freezing. Since the thermistor 11 does not actually detect the temperature below freezing, when the resistance value of the thermistor 11 increases to below freezing due to deterioration of the thermistor 11,
Deteriorate and regard it as abnormal and operate the safety device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The basic structure and basic operation of the grill are the same as those shown in FIGS.
Only the essential parts will be described. A plurality of thermistors 11 are arranged near the exhaust port 6 of the grill chamber 1 so as to be positioned above and below the grill 2 as shown in FIG. 1. The thermistors 11 are connected to the control circuit 10. There is. In the case of this example, the upper thermistor 11a located on the grill 2 and the grill 2
It is composed of a lower thermistor 11b located below.

When using the grill by burning the burner 4, the upper thermistor 11a and the lower thermistor 11
When the temperature in the grill chamber 1 is detected by b and when the temperature in the grill chamber 1 becomes an abnormal overheat temperature as described in the related art, the grill overheat prevention device is activated and the safety valve is held. The electric current is turned "OFF", the safety valve 9 is turned "closed", and the buzzer notifies. Also the upper thermistor 11
a is abnormal (open, short) or lower thermistor 1
Even when 1b is abnormal (open, short), the safety valve holding current is "OFF", the safety valve 9 is "closed", and the buzzer notifies. In the present invention, the deterioration state of the thermistor 11 is also detected. When the deterioration of the thermistor 11 is detected, the safety device is activated and the safety valve holding current is "OF".
The safety valve 9 becomes "F" and the safety valve 9 becomes "closed", and the buzzer notifies.

The detected temperature A of the upper thermistor 11a in a state where the thermistor 11 is not open or short-circuited abnormally.
And the detected temperature B of the lower thermistor 11b are compared,
When the detected temperature A of the upper thermistor 11a is abnormally low, it is determined that the upper thermistor 11a has deteriorated.
That is, as shown in FIG. 2, the detected temperature A of the upper thermistor 11a and the detected temperature B of the lower thermistor 11b are compared, and if A−B ≦ 0 (or a predetermined α), the detected temperature of the upper thermistor 11a is lower. The upper thermistor 11a deteriorates at an abnormally low temperature as compared with the detection temperature B of the thermistor 11b (the lower thermistor 11b is less likely to be exposed to a high temperature due to ignition or the like and is much less likely to deteriorate than the upper thermistor 11a). It is determined that the safety valve is activated, the safety valve holding current is “OFF”, the safety valve 9 is “closed”, and the buzzer notifies. This allows the thermistor 1
The deterioration of 1 is also detected and the safety can be secured.

Further, the resistance value of the thermistor 11 deteriorates as the temperature continues to increase and the resistance value increases. However, in the present invention, when the resistance value decreases to a resistance value at which the thermistor 11 detects a temperature below freezing, it is regarded as abnormal, and the safety device operates. Upon activation, the safety valve holding current becomes "OFF", the safety valve 9 becomes "closed", and the buzzer notifies. Normally, the grill is not used below freezing, and when the resistance of the thermistor 11 increases to below freezing due to deterioration of the thermistor 11, it deteriorates and the thermistor 11 considers it to be abnormal and operates the safety device. Let

[0015]

According to the first aspect of the present invention, a thermistor for detecting the temperature in the grill chamber is provided in the vicinity of the exhaust port of the grill chamber and at a position above the grill and below the grill. A plurality of thermistors are installed on the top and bottom so that the thermistors are located respectively, and the detected temperature of the thermistors located above the grill is compared with the detected temperature of the thermistors located below the grill. When the thermistor located at detects an abnormally low temperature, the above thermistor deteriorates and it is judged as unsafe so that the safety device is activated, so the thermistor located above the grill detects it. By comparing the temperature and the temperature detected by the thermistor located below the grill, it is possible to judge the deterioration of the thermistor located above and activate the safety device. The detecting are those capable of ensuring safety, yet it is capable of detecting the deterioration of the thermistor position above only a simple structure to compare the detected temperature of the upper and lower thermistor.

The invention of claim 2 of the present invention is the invention of claim 1.
In the above, when at least one thermistor detects the temperature below freezing, it is determined that the thermistor has deteriorated. Therefore, the resistance value of the thermistor should be detected so that the temperature that the thermistor normally does not detect is detected. It is possible to detect the deterioration of the thermistor and secure more safety even if the value becomes large.

[Brief description of drawings]

FIG. 1 is a schematic sectional view illustrating a structure of a main part of a grill of the present invention.

FIG. 2 is a flowchart explaining the operation of the main part of the above.

FIG. 3 is a schematic sectional view showing an overall structure of a general grill.

FIG. 4 is a flowchart illustrating the operation of the grill of FIG.

[Explanation of symbols]

1 grill room 2 grill 4 burners 11 thermistor 11a Upper thermistor 11b Lower thermistor

Continued front page    (72) Inventor Atsuko Nakajima             Osaka Prefecture Konohana-ku Kasuga Minami 3-chome 2-10 share             Ceremony company Harman Pro (72) Inventor Tetsuji Harada             Osaka Prefecture Konohana-ku Kasuga Minami 3-chome 2-10 share             Ceremony company Harman Pro F-term (reference) 4B040 AA03 AA08 AB03 AC02 AD04                       AE13 CA02 CA17 LA04 LA16                       LA20

Claims (2)

[Claims] 1. In a grill provided with a grill for placing an object to be cooked and a burner for heating and baking the object to be cooked, a thermistor for detecting the temperature in the grill chamber is provided as an exhaust port of the grill chamber. A plurality of thermistors are provided above and below the grill so that the thermistors are located above the grill and below the grill, respectively. The thermistor located below the grill is compared with the detected temperature, and when the thermistor located above detects an abnormally low temperature, the thermistor above deteriorates and it is judged unsafe, and the safety device is activated. The safety device for the grill, which is characterized in that 2. The grill safety device according to claim 1, wherein when the at least one thermistor detects a temperature below freezing, it is determined that the thermistor has deteriorated.