JP3640746B2 - Timer additional heat device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating device such as a grill device or a gas stove, and more particularly to a timer additional heat device having a timer function.
[0002]
[Prior art]
For example, in a grill device or gas stove, in order to prevent the burner or other heating source from operating for a long time due to the user's disappointment, or the burning of cooked food, it is necessary to start operation in advance. When a predetermined time (several tens of minutes for a grill device, several hours for a gas stove) elapses, a device that automatically stops the operation of the heating source or issues a warning by a buzzer (so-called forgetting to turn off prevention function) Are known.
[0003]
In addition, for example, in a grill device, in order to prevent the user from forgetting that the grill is in use, and to provide a measure of the quality of the cooked food stored in the warehouse, for example, at regular intervals during operation. It is also known that a buzzer is sounded every 3 minutes (for example, 3 minutes).
[0004]
In such a heating device having a timer function, the control circuit that controls the operation of the device recognizes the elapsed time by counting clock signals of a predetermined frequency generated by the timer circuit, and based on the recognized elapsed time. The operation of the apparatus as described above is performed at a predetermined timing.
[0005]
By the way, in the heating apparatus having such a function, it is desired to confirm whether or not the manufactured product operates correctly in the production factory or the like.
[0006]
In particular, for example, in the grill apparatus, there are a double-sided baking type equipped with two heating sources in a grill cabinet and a single-sided baking type equipped with one heating source. Since the degrees are different from each other, the timer time of the forgetting-off prevention function may be different from each other, while most other functions may be the same. In such a case, since the circuit configurations of the control circuits and the like of both models are almost the same, there is a possibility that an assembly error of the circuit unit may occur between these models, and therefore the operation of the product is checked. It is particularly desirable.
[0007]
However, for example, in the function to prevent forgetting to turn off, even if the product of the heating device is actually operated, a long time (several tens of minutes for the grill device and several hours for the gas stove) must elapse after the operation is started. For example, since the operation stop operation and alarm operation of the apparatus are not performed, it is difficult to confirm the operation in a short time.
[0008]
Moreover, even if the buzzer sounds at a certain time interval (3 minutes) as described above, the function only works every 3 minutes, so it is difficult to check the operation in a short time. It was.
[0009]
In such a heating device having a timer function that operates over a relatively long time, it is difficult to check the operation of the product, and it has been desired to improve this.
[0010]
[Problems to be solved by the invention]
In view of such a background, the present invention is capable of efficiently confirming the operation of a heating apparatus having a timer function that operates over a relatively long time in a short time, and can also be performed with a timer-added heat that can be performed with an inexpensive configuration. An object is to provide an apparatus.
[0011]
[Means for Solving the Problems]
In order to achieve such an object, the timer additional heat device of the present invention recognizes an elapsed time by counting a clock signal of a timer circuit that generates a clock signal of a predetermined frequency and the timer circuit, and at a predetermined time-lapse timing. In the timer additional heat apparatus having a control circuit for performing a required operation of the apparatus, the timer circuit is provided so that the frequency of the generated clock signal can be switched between at least the predetermined frequency and a frequency higher than the predetermined frequency. Mode setting means for setting the inspection mode and non-inspection mode of the apparatus to be switchable, and when the inspection mode is set by the mode setting means, the frequency of the clock signal of the timer circuit is higher than the predetermined frequency. When the timer circuit is switched to the frequency and the non-inspection mode is set by the mode setting means And a clock frequency switching circuit for switching the frequency of the clock signal to said predetermined frequency, said mode setting means, the clock frequency switching circuit connector connected to said control circuit having a pair of terminals, the timer circuit and the clock The circuit board on which the frequency switching circuit is mounted is provided, and the inspection mode is set when the pair of terminals are short-circuited by a jumper wire that is detachably attached to the connector, and the jumper wire is not attached to the connector. The non-inspection mode is set when the pair of terminals are opened to each other .
[0012]
According to the present invention, when the inspection mode is set by the mode setting means, the clock frequency switching circuit switches the frequency of the clock signal of the timer circuit to a frequency higher than the predetermined frequency in the normal case. In this state, when the heating device is operated, the control circuit recognizes the elapsed time by counting clock signals having a frequency higher than that in a normal case. It will be faster than usual. For this reason, the control circuit performs the required operation of the apparatus at a timing that is earlier than in a normal case.
[0013]
Therefore, when confirming the operation of the heating device, the mode setting means sets the inspection mode and operates the heating device, so that the required operation of the device according to the elapsed time is earlier than the normal case. Therefore, the operation check of the heating device can be performed efficiently in a short time. After this operation check, the mode setting means sets the non-inspection mode so that the timer circuit generates a clock signal having a normal predetermined frequency. With this control, the required operation is performed at the normal timing.
The mode setting means includes a connector having a pair of terminals on the circuit board, sets an inspection mode when the pair of terminals are short-circuited by a jumper wire that is detachable from the connector, and the jumper is connected to the connector. Since the non-inspection mode is set when the pair of terminals are opened to each other without attaching a wire, a heating device that exhibits the above-described effects with a very inexpensive and simple configuration using a connector or a jumper wire is provided. Can be provided. And since the inspection mode and the non-inspection mode are set depending on whether or not the pair of terminals of the connector are short-circuited by the jumper wire, the mode set by the presence or absence of the jumper wire can be seen at a glance. After confirming the operation, it is possible to prevent a situation in which the product is shipped with the inspection mode set.
[0014]
In the present invention, the timer circuit generates a reference clock signal generation circuit that generates a reference clock signal having a constant frequency that is equal to or higher than the predetermined frequency, and the clock signal that divides the reference clock signal and applies the clock signal to the control circuit. And a frequency dividing circuit that can be switched between a frequency dividing ratio corresponding to the predetermined frequency and a frequency dividing ratio corresponding to a frequency higher than the predetermined frequency by a predetermined instruction signal. The clock frequency switching circuit switches the frequency of the clock signal generated by the frequency dividing circuit by giving the predetermined instruction signal to the frequency dividing circuit in accordance with the mode set by the mode setting means.
[0015]
According to this, the instruction signal corresponding to the mode set from the clock frequency switching circuit is given to the frequency dividing circuit that divides the reference clock signal and generates the clock signal to be given to the control circuit. The frequency of the clock signal of the timer circuit can be easily switched by switching the frequency dividing ratio of the frequency dividing circuit.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of the timer additional heat apparatus of the present embodiment, and FIG. 2 is an operation explanatory diagram of the apparatus of FIG.
[0019]
Referring to FIG. 1, the timer additional heat device of the present embodiment is, for example, a gas grill device, and an electromotive force is generated by a burner 2 as a heating source disposed at an upper portion in the grill 1 and a combustion flame of the burner 2. , A solenoid valve 5 and a mechanical main valve 6 provided in the fuel supply path 4 to the burner 2, a buzzer 7 provided in a device housing (not shown), and the solenoid valve 5 and buzzer 7 And an electronic circuit unit 8 for controlling the operation of the above. The thermocouple 3, the electromagnetic valve 5, and the buzzer 7 are connected to the electronic circuit unit 8 via a harness and a connector (not shown).
[0020]
The solenoid valve 5 and the main valve 6 are opened against an urging force of a spring (not shown) by igniting (pressing) an ignition / fire extinguishing button 9 provided on a front panel of a casing (not shown). In this state, even if the operation of the ignition / fire extinguishing button 9 is released by energizing the solenoid valve 5 from the electronic circuit unit 8, the solenoid valve 5 is held open, and the main valve 6 is mechanically opened. It is supposed to be retained. When a misfire or the like occurs, the energization of the solenoid valve 5 is interrupted by the electronic circuit unit 8 so that the solenoid valve 5 is closed by the biasing force of the spring, and the main valve 6 is an ignition / fire extinguishing button. By pressing 9 again (fire extinguishing operation), the valve is closed by the biasing force of the spring. The electronic circuit unit 8 is supplied with a power supply voltage from a battery (not shown) via a micro switch (not shown) that is closed by pressing the ignition / fire extinguishing button 9. The operation of the main valve 6, the electromagnetic valve 5 and the micro switch according to the operation of the fire extinguishing button 9 is performed using a known heart cam mechanism.
[0021]
The electronic circuit unit 8 detects whether or not the burner 2 is ignited by the output of the microcomputer 10 (hereinafter referred to as the microcomputer 10) and the thermocouple 3, and provides an ignition detection circuit that gives the microcomputer 10 a corresponding signal. 11, a solenoid valve drive circuit 12 for energizing or shutting off the solenoid valve 5 according to a command from the microcomputer 10, a buzzer drive circuit 13 for sounding the buzzer 7 according to a command from the microcomputer 10, and a constant frequency reference for timing A reference clock signal generation circuit 14 that generates a clock signal SC (see the upper part of FIG. 2), a frequency dividing circuit 15 that divides the reference clock signal SC and gives it to the microcomputer 10, and a frequency dividing ratio of the frequency dividing circuit 15 A frequency dividing ratio indicating circuit 16 for instructing the frequency dividing circuit 15 and a connector 18 having a pair of terminals 17a and 17b connected to the frequency dividing ratio indicating circuit 16 are rotated. It is constructed by mounting the substrate 19.
[0022]
Here, corresponding to the configuration of the present invention, the reference clock signal generation circuit 14 and the frequency dividing circuit 15 constitute a timer circuit 20, the frequency division ratio indicating circuit 16 constitutes a clock frequency switching circuit 16, and the microcomputer 10, The ignition detection circuit 11, the electromagnetic valve drive circuit 12 and the buzzer drive circuit 13 constitute a control circuit 21.
[0023]
Further, the connector 18 constitutes mode setting means, and a jumper wire 22 indicated by a virtual line in FIG. 1 can be detachably connected to the terminals 17a and 17b of the connector 18. In this case, in this embodiment, the state in which the jumper wire 22 is connected to the terminals 17a and 17b and both the terminals 17a and 17b are short-circuited is set to the inspection mode, and the jumper wire 22 is not connected to the terminals 17a and 17b. , 17b are in a non-inspection mode for normal operation of the apparatus.
[0024]
The frequency division ratio instruction circuit 16 determines whether or not the terminals 17a and 17b of the connector 18 are short-circuited, in other words, whether or not the jumper wire 22 is connected to the terminals 17a and 17b (inspection mode or non-inspection mode). ) Is applied to the frequency dividing circuit 15 (for example, a signal of high and low binary levels).
[0025]
The frequency dividing circuit 15 divides the reference clock signal SC by a predetermined frequency dividing ratio in accordance with the two types of instruction signals from the frequency dividing ratio indicating circuit 16 and gives the result to the microcomputer 10. In this case, when the signal supplied from the frequency division ratio indicating circuit 16 is a signal indicating the open state (non-inspection mode) of the terminals 17a and 17b, the frequency dividing circuit 15 converts the reference clock signal SC to, for example, 1 of the frequency. The frequency is divided to a frequency of / 120, and the divided signal is supplied to the microcomputer 10 as a clock signal Cs (see the lower part of FIG. 2). Further, when the signal given from the frequency division ratio indicating circuit 16 is a signal indicating the short-circuited state (inspection mode) of the terminals 17a and 17b, the reference clock signal SC is frequency-divided to, for example, half the frequency. The frequency-divided signal is supplied to the microcomputer 10 as a clock signal Ck (see the middle stage in FIG. 2). Therefore, in the inspection mode, the frequency of the clock signal Ck output from the microcomputer 10 by the frequency divider 15 is 60 times the frequency of the clock signal Cs output from the microcomputer 10 in the non-inspection mode. As shown in FIG. 2, the period of the clock signal Cs in the non-inspection mode is 60 times the period T of the clock signal Ck in the inspection mode.
[0026]
The microcomputer 10 gives an energization command to the electromagnetic valve 5 to the electromagnetic valve drive circuit 12 when a power supply voltage is applied from a battery (not shown) by the ignition operation of the ignition / fire extinguishing button.
[0027]
Further, the microcomputer 10 recognizes the elapsed time by counting the clock signal of the frequency dividing circuit 15 from the time when the signal indicating the ignition state of the burner 2 is given from the ignition detection circuit 11, and the count number of the clock signal When the predetermined number reaches a predetermined number, the solenoid valve drive circuit 12 is instructed to cut off the energization of the solenoid valve 5, and the buzzer 7 is continuously sent to the buzzer drive circuit 13, for example, "P". Command to ring. Such control operation is intended to prevent the combustion operation of the burner 2 from being left for a long time due to the user's forgetting, etc., and causing the temperature in the grill 1 to rise excessively or to cause burnt cooking. It is. In this case, in this embodiment, when the low-frequency clock signal Cs is output from the frequency divider circuit 15, for example, when 24 minutes have elapsed since the burner 1 ignited, the clock signal Cs The count number reaches the predetermined number, and the control operation of the microcomputer 10 as described above is performed.
[0028]
Further, the microcomputer 10 buzzes the buzzer driving circuit 13 every time the count number of the clock signal of the frequency dividing circuit 15 reaches the second predetermined number after the burner 2 ignites, in other words, every certain time interval. 7 is instructed to ring once, for example, “beep”. Such a control operation is for informing the user of the cooking time by the combustion operation of the burner 1 as a guide. In this case, in this embodiment, the count number of the clock signal Cs is, for example, every 3 minutes after the burner 1 is ignited while the low frequency side clock signal Cs is output from the frequency divider circuit 15. The control operation of the microcomputer 10 as described above is performed when the second predetermined number is reached. In this case, the count number of the clock signal Cs is cleared every time it reaches the second predetermined number.
[0029]
Next, the operation of the grill device of this embodiment will be described.
[0030]
First, during normal operation of the grill device, the jumper wire 22 is not connected between the terminals 17a and 17b of the connector 18, and the non-inspection mode is set.
[0031]
In this case, when the ignition / fire extinguishing button 9 is ignited, the main valve 6 and the electromagnetic valve 5 are opened, fuel gas is supplied to the burner 2, and a power supply voltage is applied to the electronic circuit unit 8 so that the unit 8 Each circuit starts. At this time, when the microcomputer 10 gives an energization command to the solenoid valve 5 to the solenoid valve drive circuit 12, the solenoid valve 5 is energized from the solenoid valve drive circuit 12, and the solenoid valve 5 is held open. Further, at this time, an igniter (not shown) is operated to ignite the burner 2, thereby starting the combustion operation of the burner 2. Further, at this time, the frequency dividing ratio indicating circuit 16 gives a signal to the frequency dividing circuit 15 that the terminal 17a and 17b of the connector 18 are open, so that the frequency dividing circuit 15 is in the non-inspection mode. The clock signal Cs obtained by dividing the reference clock signal of the reference clock signal generation circuit 14 by 1/120 is supplied to the microcomputer 10.
[0032]
In this way, when the combustion operation of the burner 2 is started and a signal indicating the ignition state of the burner 2 is given from the ignition detection circuit 11 to the microcomputer 10, the microcomputer 10 counts the clock signal Cs given from the frequency dividing circuit 15. .
[0033]
Then, each time the count number of the clock signal Cs reaches the second predetermined number, that is, every three minutes after the burner 2 ignites, the microcomputer 10 generates a buzzer 7 in the buzzer driving circuit 13 once. Command to ring. As a result, the buzzer driving circuit 13 sounds the buzzer 7 as “beep” every 3 minutes. By the ringing of the buzzer 7, the user can recognize the cooking time due to the combustion operation of the burner 2, and can take measures such as changing the direction of the cooked food or repeating the food at an appropriate timing.
[0034]
Further, in the case where the combustion operation of the burner 2 is left unattended due to the user's disappointment or the like, the microcomputer 10 detects that the count number of the clock signal Cs reaches the predetermined number, that is, 24 after the burner 2 ignites. When the minute has elapsed, the solenoid valve drive circuit 12 is instructed to cut off the energization of the solenoid valve 5, and the buzzer drive circuit 13 is instructed to continuously sound the buzzer 7. By this instruction, the solenoid valve drive circuit 12 shuts off the energization to the solenoid valve 5, closes the solenoid valve 5, and automatically extinguishes the burner 2. Further, the buzzer driving circuit 13 continuously sounds the buzzer 7 like “Peep”.
[0035]
This prevents a situation in which the temperature in the grill 1 becomes excessively high or the cooked food is burnt. Further, the user can recognize that the combustion operation of the burner 2 has been forcibly stopped by the ringing of the buzzer 7.
[0036]
On the other hand, in the production factory of the apparatus of the present embodiment, when checking the operation of the apparatus, the jumper wire 22 is connected to the terminals 17a and 17b of the connector 18 to short-circuit the terminals 17a and 17b. Set the mode.
[0037]
In this state, the combustion operation of the burner 2 is performed in the same manner as in the non-inspection mode described above.
[0038]
At this time, since both terminals 17a and 17b of the connector 18 are short-circuited, the frequency dividing ratio indicating circuit 16 gives a signal indicating that it is in the inspection mode to the frequency dividing circuit 15, whereby the frequency dividing circuit 15 The clock signal Ck obtained by dividing the reference clock signal of the clock signal generation circuit 14 by half is supplied to the microcomputer 10. The microcomputer 10 counts the clock signal Ck and recognizes the elapsed time.
[0039]
In this case, since the frequency of the clock signal Ck is 60 times higher than the clock signal Cs, the count number is 1/60 time interval (3 second interval) in the non-inspection mode described above. A predetermined number of 2 is reached. Accordingly, the microcomputer 10 causes the buzzer 7 to ring once by the buzzer driving circuit 13 every 3 seconds after the burner 2 ignites.
[0040]
The count number of the clock signal Ck reaches the predetermined number when 1/60 time (24 seconds) in the non-inspection mode has elapsed since the burner 2 ignited. Therefore, the microcomputer 10 closes the solenoid valve 5 by the solenoid valve drive circuit 12 to extinguish the burner 2 when 24 seconds have elapsed since the burner 2 ignited, and also turns off the buzzer 7 by the buzzer drive circuit 13. Let it ring continuously.
[0041]
In this way, the buzzer 7 sounds once every 3 seconds, and after 24 seconds, the burner 2 is extinguished and the buzzer 7 sounds continuously. In the inspection mode, it can be seen that the buzzer 7 normally rings once every three minutes, and the burner 2 is extinguished after 24 seconds and the buzzer 7 sounds continuously. If the operation is not performed every 3 seconds or after 24 seconds, the electronic circuit unit 8 may be out of order, or a different model may be installed by mistake. As a result, the operation of the apparatus can be confirmed.
[0042]
In this case, since the operation of the buzzer 7 and the electromagnetic valve 5 is performed at a much earlier timing than during normal operation, the operation of the apparatus can be confirmed efficiently in a short time.
[0043]
Further, in order to perform such an operation check, the frequency division ratio of the frequency dividing circuit 15 that generates a clock signal for timing can be switched between two types, and the switching is performed using the jumper line 22, the connector 18, or the like. Therefore, it is possible to check the operation with a very inexpensive and simple configuration.
[0044]
Further, since the inspection mode and the non-inspection mode are set depending on whether or not the jumper wire 22 is connected to the connector 18, the setting mode can be recognized at a glance depending on the presence or absence of the jumper wire 22, and the operation has been confirmed. It is possible to avoid a situation in which the device is accidentally shipped while being set to the inspection mode.
[0045]
In the above-described embodiment, the single-sided grill type grill device including only a single burner 2 in the grill cabinet 1 has been described. As with the present embodiment, the operation check can be performed in a short time by providing the connector and the frequency division ratio indicating circuit as in the present embodiment.
[0046]
Moreover, in this embodiment, in addition to the function of performing automatic fire extinguishing and buzzer sounding after a predetermined time (24 minutes), the burner 2 performs notification by the buzzer 7 every 3 minutes. Of course, the present invention can also be applied to a model that does not perform the buzzer notification or a model that only performs automatic fire extinguishing or only sounds the buzzer after a predetermined time (24 minutes).
[0047]
Furthermore, in the present embodiment, the grill device has been described as an example, but the present invention can also be applied to a stove, an oven, or the like having various timer functions.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an embodiment (grill device) of the present invention.
2 is an operation explanatory diagram of the apparatus of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 14 ... Reference clock signal generation circuit, 15 ... Frequency division circuit, 16 ... Frequency division non-instruction circuit (clock frequency switching circuit), 17a, 17b ... Terminal, 18 ... Connector, 20 ... Timer circuit, 21 ... Control circuit, 22 ... Jumper wire.

Claims (2)

A timer circuit having a timer circuit that generates a clock signal of a predetermined frequency, and a control circuit that recognizes an elapsed time by counting the clock signal of the timer circuit and performs a required operation of the device at a predetermined time-lapse timing In the heating device,
The timer circuit is provided so that the frequency of the clock signal to be generated can be switched between at least the predetermined frequency and a frequency higher than the predetermined frequency,
Mode setting means for setting the inspection mode and non-inspection mode of the apparatus to be switchable; and when the inspection mode is set by the mode setting means, the frequency of the clock signal of the timer circuit is set to a frequency higher than the predetermined frequency. And a clock frequency switching circuit that switches the frequency of the clock signal of the timer circuit to the predetermined frequency when the non-inspection mode is set by the mode setting means ,
The mode setting means includes a connector having a pair of terminals connected to the clock frequency switching circuit on a circuit board on which the control circuit, the timer circuit, and the clock frequency switching circuit are mounted. The inspection mode is set when the pair of terminals are short-circuited by a detachable jumper wire, and the non-inspection mode is set when the pair of terminals are opened to each other without attaching a jumper wire to the connector. A timer additional heat device, characterized in that it is set .   The timer circuit generates a reference clock signal generation circuit that generates a reference clock signal having a constant frequency that is equal to or higher than the predetermined frequency, and generates the clock signal that divides the reference clock signal and applies it to the control circuit, and The frequency division ratio comprises a frequency division circuit capable of switching a frequency division ratio between a frequency division ratio corresponding to the predetermined frequency and a frequency division ratio corresponding to a frequency higher than the predetermined frequency by a predetermined instruction signal, and the clock frequency switching The circuit switches the frequency of the clock signal generated by the frequency dividing circuit by giving the predetermined instruction signal to the frequency dividing circuit in accordance with the mode set by the mode setting means. Item 2. The timer additional heat device according to Item 1.

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