JP2010014372A - Tempura fire prevention device for gas table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent fire during Tempura cooking and successfully secure convenience during cooking by a gas table. <P>SOLUTION: A human sensing sensor 3 is installed on the gas table 2, and the human sensing sensor 3 is connected to the controller 4. The human sensing sensor 3 detects that a person is separated from the gas table 2, and based on a command of the controller 4, the gas of the gas table 2 is shut off via a timer 10. In the case that the human sensing sensor 3 detects that a person is separated from the gas table 2 and brought into a human absence monitoring mode, when the person is returned before the gas is shut off by turning on of the timer 10 and the person is returned for a short time, the human absence monitoring mode by the human sensing sensor 3 is continued. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tempura fire prevention device for a gas table, and more particularly to a tempura fire prevention device for a gas table that can ensure safety when a person leaves the gas table while frying the tempura.

  The most common cause of the occurrence of fire during cooking with this kind of gas table is due to excessive temperature rise of tempura oil when frying tempura. Conventionally, with regard to the function of preventing tempura fire, the temperature of tempura oil during cooking is constantly measured in order to control the temperature of tempura oil so as not to cause a fire, and the operation of the gas table is based on the result. I have control.

For example, as a specific method for preventing overheating of the tempura oil, a method has been proposed in which an oil thermometer is attached to the tempura pan and the maximum temperature of the burner is controlled by the temperature of the tempura oil. Moreover, in order to notify a cook of overheating of tempura oil, a tempura fire prevention device for a gas table provided with an alarm function has also been proposed (see, for example, Patent Document 1 or 2).
JP-A-6-109244 JP 2000-179859 A

  Although the conventional gas table tempura fire prevention device can effectively prevent fire when frying tempura, all the burners are equipped with the above control means, so when cooking dishes other than tempura But it takes control of the maximum temperature of the burner. Therefore, when cooking dishes other than tempura, there is a problem that the convenience of the gas table is reduced and the inconvenience of the cooker is increased.

  Therefore, not only can a fire caused by deep-fried tempura be prevented, but also a technical problem to be solved in order to ensure convenience when cooking foods other than tempura has arisen. The purpose is to solve.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that a human sensor is installed on a gas table and the human sensor is connected to a controller so that a person can connect the gas sensor. A tempura fire prevention device for a gas table with a sensation sensor configured to detect that the sensation sensor is separated from the table with the occupancy sensor and shut off or squeeze the gas with a timer according to a command from the controller. Even when the human sensor detects that the person has left the gas table and enters the absence monitoring mode, the prevention device allows the person to stop the gas before the gas is shut off by the timer. When returning to the table and detecting the return state of the person for a short time, the person absence sensor monitoring mode by the presence sensor is continued. It was to provide a tempura fire prevention device for a gas table, wherein.

  According to this configuration, for example, when a person leaves the gas table during cooking of tempura, the human sensor detects this and enters the absence monitoring mode. Even when the person's absence monitoring mode is entered, the person's absence monitoring by the human sensor is detected in a state where the person has returned to the gas table in a short time until the gas is shut off by the timer. The mode continues. On the other hand, when it is detected that the person does not return to the gas table even after the timer set time elapses, the timer shuts off the gas.

  According to a second aspect of the present invention, the dead time is set so that the human sensor does not immediately enter the absence monitoring mode even if a person leaves the gas table. A table tempura fire prevention device is provided.

  According to this configuration, since the dead time is set in the human sensor, even if a person leaves the gas table, the human sensor does not immediately enter the absence monitoring mode. For example, several seconds to 10 seconds after the dead time elapses. The absence monitoring mode is entered after a lapse of seconds.

  According to the first aspect of the present invention, the gas supply to the gas table is shut off by the timer when the person who is frying the tempura leaves the gas table and the timer set time elapses, so that the fire caused by overheating of the tempura oil Occurrence can be prevented. On the other hand, when a person away from the gas table returns again in a short time, the gas supply to the gas table is maintained, so that cooking on the gas table can be continued as it is, and the usability of the gas table is improved.

  In addition, since the maximum temperature is not controlled on all burners as in the conventional device, the convenience of the gas table is significantly improved without sacrificing the convenience of the gas table as in the past when cooking foods other than tempura. Can be made.

  In the invention according to claim 2, in addition to the effect of the invention according to claim 1, the human sensor does not immediately shift to the absence monitoring mode even if the person is separated from the gas table for a short time. When the user moves away from the camera and then returns within, for example, several seconds to 10 seconds, the human sensor does not operate frequently each time, and the operational stability of the human sensor can be ensured over a long period of time. .

  In order to achieve the object of preventing the occurrence of a fire due to an excessive temperature rise of tempura oil without impairing the convenience of cooking with a gas table, the present invention is provided with a human sensor on the gas table. And a human sensor configured to connect the human sensor to the controller, detect by the human sensor that the person has left the gas table, and shut off or squeeze the gas by a timer according to a command from the controller. A tempura fire prevention device for a gas table with a sensor, wherein the tempura fire prevention device is when the human sensor detects that a person has left the gas table and enters a person absence monitoring mode. However, when the gas is shut off by the timer, the person returns to the gas table, and the person's return state is detected for a short time. , Absence monitoring mode of the person by the motion sensors is realized by having the structure described is continued.

  A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view showing a tempura fire prevention device 1 for a gas table according to the present embodiment. In the figure, reference numeral 2 denotes a gas table, and a human sensor (personal sensor) 3 is installed in the vicinity of the gas table 2, and a human (cooking) is placed in front of the gas table 2 by the human sensor 3. Person) Whether or not M exists is detected.

  For example, when the person M leaves the front of the gas table 2 while the person M is cooking tempura on the gas table 2, the human sensor 3 automatically switches to the absence monitoring mode. As a detection method of the human sensor 3, any of an infrared detection method, an ultrasonic detection method, a radio wave detection method, and the like may be adopted.

  A controller 4 having a storage unit and a determination unit is connected to the human sensor 3, and a sensor signal detected by the human sensor 3 is input to the controller 4. Thus, based on the sensor signal, when the person M leaves the gas table 2 and the human sensor 3 enters the absence monitoring mode, the controller 4 automatically detects that the person has moved to the absence monitoring mode. Determine and memorize.

  Furthermore, a temperature measuring unit 5 made of a thermocouple, thermistor, platinum or the like is attached in the vicinity of the burner at the lower part of the gas table 2, and the temperature measuring unit 5 senses the presence or absence of a flame in the gas table 2 and is likely to go out Is monitoring. The temperature measuring unit 5 is connected to a gas appliance plug 6.

  In addition, a gas shut-off device is incorporated in the gas appliance plug 6, and when the person M leaves the gas table 2 after leaving the timer setting time or longer, the gas supply to the gas table 2 is automatically shut off (low heat is generated). Including the restriction of gas supply to the extent.

  The gas appliance plug 6 is connected to a temperature control valve 8 having a built-in dry battery 7, and the temperature control valve 8 changes the gas flow rate by changing the opening / closing amount, whereby the burner of the gas table 2 is changed. Variable adjustment of firepower. Further, a flow rate sensor 9 is connected to the temperature control valve 8, and the gas supply amount to the gas table 2 is detected by the flow rate sensor 9. The flow sensor 9, temperature control valve 8, and gas appliance plug 6 are electrically connected to the controller 4, and are configured to exchange command signals and sensor signals with the controller 4.

  Further, a timer 10 is connected to the controller 4, and a reset time is preset for the timer 10. When the timer 10 is turned on by a command signal from the controller 4, the gas appliance plug 6 can immediately shut off the gas supply to the gas table 2.

  In the tempura fire prevention apparatus 1 according to this embodiment, when the person M who is cooking in front of the gas table 2 leaves the gas table 2, the human sensor 3 detects this and the absence of a person. Enter monitoring mode. Further, the detection signal of the human sensor 3 is input to the controller 4, and based on the detection signal, the controller 4 determines that there is no person M in front of the gas table 2 and stores it.

  If the person M leaves the gas table 2 and does not return even after the lapse of the specified time, the timer 10 is activated and, at the same time, the gas appliance plug 6 supplies gas to the gas table 2 according to the command signal of the controller 4. Supply is shut off immediately. Therefore, even if a person M leaves the gas table 2 for a specified time or longer during frying in the tempura pan 11, the tempura oil will not be overheated, preventing the occurrence of fire due to overheating of the tempura oil. Safety.

  On the other hand, even if the presence sensor 3 enters the absence monitoring mode, if the person M returns to the gas table 2 within a short time, for example, 90 seconds after entering the absence monitoring mode, the timer 10 The gas supply to the gas table 2 is maintained without turning on.

  That is, when the person M returns immediately after leaving the gas table 2, the operation of the timer 10 is not reset, so the gas supply to the gas table 2 is not shut off, and the cooking by the burner of the gas table 2 is continued. The Therefore, even when the person M is away from the gas table 2 for a short time, the cooking by the burner is not interrupted, so that the person M who cooks with the gas table 2 does not feel inconvenience.

  Next, the control method of the gas table 2 based on the signal of the human sensor 3 according to the present invention will be described in more detail. The cause of tempura fire is an abnormal rise in tempura oil temperature (ignition at about 360 ° C.). On the other hand, the cause of the occurrence of such an abnormal temperature rise is mainly due to the cook leaving the front of the gas table 2 for some reason during cooking. Therefore, it is possible to prevent a fire by detecting that the cook is away from the front of the gas table 2 by a specified time and responding by reducing the gas flow rate. However, in this control method, the cook is in front of the gas table 2. The temperature is not controlled at all by restricting the mechanical gas flow rate, so that the cook does not feel inconvenience of cooking by temperature monitoring as in the conventional apparatus.

  Next, the timer setting time until the gas cutoff by the timer 10 after entering the absence monitoring mode of the person is examined. In this control method, the temperature of tempura oil is not actually measured, the time elapsed when a person leaves the gas table 2 is measured by the timer 10, and the gas appliance plug 6 is measured by the controller 4 based on the measurement result. The gas shutoff is executed by controlling the operation of. Therefore, it is necessary to determine the time until the temperature of the tempura oil reaches a dangerous state according to the assumed cooking conditions (cooking environment). In determining the time, the numerical values of the items illustrated in Table 1 are considered as preconditions.

  In addition, the present inventors have obtained knowledge that the amount of heat generated by gas combustion is sufficiently larger than the amount of heat generated from the tempura oil itself as the temperature of the tempura oil increases. According to this knowledge, for example, when tempura is fried at a high temperature of 190 ° C. with 200 cc tempura oil, the cook leaves the gas table 2 with the highest gas combustion output, and then for a predetermined time (about 1 minute 30). Stop the gas after a second) to prevent a fire.

  However, even if the gas supply is cut off (or the minimum amount of gas is throttled), the temperature rise of the tempura oil continues for a while, so it is necessary to control after a lapse of about 1 minute with a margin.

  Next, considering a fire due to overheating of a small amount of tempura oil, it is assumed that the cooker cooks with less tempura oil than 200 cc, and how much time should elapse before the gas should be shut off. FIG. 2 is a plot of the time required for the temperature to rise from 190 ° C. to 300 ° C. when 200 cc tempura oil and 500 cc tempura oil are heated with a medium burner and a large burner, respectively.

As can be seen from this graph, although there is a difference depending on the size of the burner, in any case, even if the amount of tempura oil becomes small, the time taken to rise to the above temperature by heating is not zero. It is expected that a time of about 1 minute will be taken even under the condition that the amount of is very small. Therefore, even if the amount of tempura oil is small with a margin, if it takes 20 to 30 seconds, it is considered that a temperature rise that leads to a fire cannot occur. Therefore, in order to reliably prevent overheating of the tempura oil assuming the use of a very small amount of tempura oil, it is necessary to shut off the gas in a short time of about 20 to 30 seconds.

  Next, the setting of the dead time of the human sensor 3 will be described. For example, it is assumed that the human sensor 3 senses that there is no cook from the gas table 2, and then the cook returns after 40 seconds, and the cook leaves immediately. At this time, it is considered that the temperature of the tempura oil is already very high. Therefore, if heating for one minute is continued again thereafter, the possibility that the temperature of the tempura oil exceeds 300 ° C. cannot be denied in the worst case.

  Given this situation, if the cook returns once before the gas is shut off after sensing that the cook has left, the first shut-off timer will be set unless the cook stays longer than a certain duration. It is necessary not to turn it off. For example, when it is sensed that the cook continues to stay in front of the gas table 2 for about 10 seconds or more, it is possible to reset the absence monitoring mode and leave the cook to control the heating temperature.

  On the other hand, during cooking on the gas table 2, the cook may leave the gas table 2 for a short time. In this case, if the presence sensor 3 enters the absence monitoring mode each time, the operation of the device is performed. From the viewpoint of stability, it is not preferable. Therefore, the absence monitoring mode should be entered after a time of several seconds to 10 seconds has passed since the cook is gone (see FIG. 3).

  In the control system for preventing tempura fire by the human sensor, as shown in FIG. 4, it can be seen that the automatic flow rate restriction time varies between 30 and 60 seconds depending on the minimum tempura oil flow rate.

  As described above, according to the present embodiment, when a person leaves the gas table 2 while cooking on the gas table 2, the human sensor 3 detects this and enters the person absence monitoring mode. . Even when the person absence monitoring mode is entered, if it is detected that the person has immediately returned to the gas table 2 before the predetermined time set in the timer 10 has elapsed, Since the gas supply is maintained, cooking on the gas table 2 can be continued, and the usability of the gas table 2 is not impaired.

  Further, during the cooking of the tempura, when it is detected that a person has left the gas table 2 and does not return even if the set time has elapsed, the gas supply to the gas table 2 is cut off via the timer 10. Therefore, the occurrence of fire due to overheating of tempura oil is prevented in advance.

  In addition, unlike the conventional apparatus, since the maximum temperature is not controlled for all the burners, the convenience of the gas table 2 does not deteriorate when cooking foods other than tempura. Thus, ensuring safety and improving convenience during cooking by the gas table 2 are satisfied at the same time.

  Furthermore, the set time when the timer 2 is turned on is set according to the cooking conditions such as the burner heating power of the gas table 2 and the amount of tempura oil so that the tempura oil does not rise to a dangerous temperature. Even if the person does not return to the gas table 2 within the set time after entering the mode, the tempura oil does not rise to a dangerous temperature, so even if the cooking conditions are different, the occurrence of a fire should be reliably prevented. Can do.

  Furthermore, since the dead time is set in the human sensor 3, even if a person leaves the gas table 2, the human sensor 3 does not immediately enter the absence monitoring mode. Therefore, since the absence monitoring mode is entered for the first time after the dead time elapses, the human sensor 3 is not frequently turned on and off every time the person leaves the gas table 2 for a short time, and the operation of the human sensor 3 is stabilized. Good properties are ensured over a long period of time.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.

The explanatory view of the tempura fire prevention device of the gas table which shows one example of the present invention. The graph explaining time when the temperature of the tempura oil which concerns on one Example rises to 300 degree | times. The graph explaining the dead time of the human sensitive sensor which concerns on one Example. The graph explaining the tempura fire prevention logic by the human sensitive sensor which concerns on one Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tempura fire prevention apparatus 2 Gas table 3 Human sensor 4 Controller 6 Gas appliance stopper 8 Temperature control valve 9 Flow sensor 10 Timer

Claims (2)

A human sensor is installed on the gas table, the human sensor is connected to the controller, the human sensor detects that the person has left the gas table, and the gas is shut off by a timer according to the command of the controller. Or a gas table tempura fire prevention device with a human sensor configured to squeeze,
Even if the human sensor detects that the person has left the gas table and enters the person absence monitoring mode, the tempura fire prevention device is capable of detecting a person before the gas is shut off by the timer. The gas table tempura fire is configured such that when the person returns to the gas table and the person's return state is detected for a short time, the human absence monitoring mode by the human sensor is continued. Prevention device.   2. The gas table tempura fire prevention device according to claim 1, wherein a dead time is set in the human sensor so as not to immediately enter the absence monitoring mode even if a person leaves the gas table.

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