JP3315052B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker in which a temperature sensor is immersed in a cooking product and a heating amount of the cooking product is controlled so that the temperature of the cooking product becomes a predetermined temperature.

[0002]

2. Description of the Related Art Conventionally, in addition to a normal mode in which food is heated with a predetermined heating amount, a heating cooking mode having a temperature control mode in which the amount of heating is adjusted so that the temperature of the food is maintained at a predetermined temperature. Vessels are known. This temperature control mode is used when performing tempura cooking or the like, and the user sets a target temperature with a temperature switch and turns on a heater switch.
Then, temperature control by the temperature control means is started, and the heating amount of the heating means is adjusted such that the target temperature matches the actual temperature of the food detected by the temperature sensor.

[0003] In a glass-top type electric stove, a temperature sensor is immersed in the food to directly detect the temperature of the food in order to accurately detect the temperature of the food. Further, in the heating cooker in which the temperature sensor is immersed in the food as described above, by making the heating cooker main body and the temperature sensor detachable, the temperature sensor can be washed alone, In the normal mode in which the temperature control is not performed, the temperature sensor is detached and stored.

If the temperature sensor is detachable from the heating cooker main body, the temperature sensor may be disconnected during the cooking in the temperature control mode, or the cooking in the temperature control mode may be performed without forgetting the connection of the temperature sensor. Could be done.

Therefore, a connection state detecting means for detecting whether or not the temperature sensor is connected to the heating cooker main body is provided, and when the temperature control mode is set, the temperature sensor is connected to the heating cooker main body. It is known that when it is detected that the heating operation is not performed, the heating operation by the heating means is prohibited.

On the other hand, for example, when a user attempts to cook tempura in the temperature control mode, a temperature sensor is immersed in oil placed in a cooking container, and heating is started at a high heating amount. If the normal mode is set by mistake, the following inconveniences occur. That is, in the normal mode, since the cooking is heated without performing the temperature control, the temperature of the oil is continuously increased by the heating, and the oil temperature is considered to be controlled to the predetermined temperature. There was a disadvantage that the oil became hot and the tempura cooking failed, contrary to the wishes of the person.

Therefore, in order to solve this inconvenience, when the connection state detecting means detects that the temperature sensor is connected to the heating cooker main body while the normal mode is set, the user is instructed. There has been proposed a device in which the cooking device is erroneously recognized as being set to the temperature control mode, is determined to be using the heating cooker, and is not heated. As a result, cooking failure as described above can be prevented.

However, the inventors of the present invention determine that the temperature sensor is not connected on the heating cooker main body side even though the temperature sensor is actually connected due to the failure of the connection state detecting means. In some cases, it has been found that the following inconvenience occurs.

That is, since the cooker main body cannot detect that the user has connected the temperature sensor, when the user is actually set to the normal mode, the user mistakenly recognizes that the user is in the temperature control mode, and the cooker is heated. This cannot be detected using a cooker. Therefore, there is a disadvantage that the cooked food is heated to a high temperature contrary to the intention of the user who assumed that the cooked food was maintained at the predetermined temperature by the cooking mode without the temperature control being performed. Was found to occur.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heating cooker which can solve the above-mentioned inconveniences and can prevent foods from becoming hot.

[0011] In order to achieve the above object, the present invention provides a heating means for heating a food, a temperature sensor which is used by being immersed in the food and detects the temperature of the food, the temperature sensor and a heating cooker main body. Connecting means for detachably connecting the heating means and a temperature control means for controlling a heating amount of the heating means so that the temperature of the food detected by the temperature sensor coincides with a predetermined target temperature. Mode switching means for switching between a temperature control mode in which temperature control is performed by the temperature control control means, and a normal mode in which a heating operation is performed with a heating amount set by a user without performing the temperature control control; Connection state detection means for detecting whether or not the sensor is connected to the cooking device main body; and the connection state detection means for detecting that the temperature sensor is not connected to the cooking device body when in the temperature control mode. To Ri when it is detected, in the heating cooker having a heating inhibiting means for inhibiting the heating operation by the heating means, during the heating operation in the normal mode,
Actually, the temperature sensor is connected to the cooking device body
Despite the failure of the connection status detection means
When it is detected that the temperature sensor is not connected, the temperature sensor
Is detected as exceeding the predetermined high temperature limit.
A heating stop means for stopping the heating operation by the heating means when notified is provided.

[0012] According to such present invention, the when in normal mode, incorrectly used for who is recognized as the temperature adjustment mode, when connecting the temperature sensor to the cooker body, the connection status detection Even in the case where the means fails and this connection cannot be detected on the heating cooker main body side, it is possible to prevent the cooked food from being heated above the high temperature limit temperature.

The connection means includes a connection cable having one end connected to the temperature sensor and the other end connected to a plug, and a jack provided on the cooker main body, and the plug being inserted and connected, The connection state detecting means is provided in the jack, and detects a connection state by a change in resistance between contacts of contacts that are opened and closed by insertion of the plug.

According to the present invention, the contact point of the jack and the resistance value between the contact point are detected for a general heating cooker in which the temperature sensor and the heating cooker body are connected by the plug and the jack. Even if a failure of the electric circuit occurs,
It is possible to provide a heating cooker that is not heated until the food becomes high temperature.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a glass-top type electric stove, which is a cooking device of the present embodiment, and FIG.
3 is a circuit diagram of the electric stove shown in FIG. 1, and FIG. 3 is a structural diagram of a jack provided in the electric stove shown in FIG.

Referring to FIG. 1A, an electric stove body 1 of the present embodiment includes a right heater H1 and a left heater H2 provided below glass 2 as heating means, and is provided in a grill chamber 3 (not shown). And a grill heater H3. When the user operates the heating amount adjustment knobs 4a, 4b, 4c, the heating operation of the right heater H1, the left heater H2, the grill heater H3 is started and stopped, and the heating amount is adjusted.

The right heater H1 has a temperature control function, and a temperature control target temperature of the user is set by the temperature setting device 5. The temperature setting device 5 sets the temperature adjustment target temperature to 160, as shown in FIG.
A temperature switch 6 for setting the temperature in three stages of ° C, 180 ° C, and 200 ° C, and mode switching means for switching the heating control mode of the right heater H1 between a temperature control mode in which temperature control is performed and a normal mode in which temperature control is not performed. A mode changeover switch 7. The right heater H <b> 1 includes two circular electric heaters (not shown) (inside and outside), and the user can switch use / non-use of the outside electric heater by operating the double zone changeover switch 13.

The thermistor 11, which is a temperature sensor, has a jack 8 provided on the electric stove body 1, a plug 9 inserted and connected to the jack 8, one end connected to the plug 9, and the other end connected to the thermistor 11. Connection cable 1
0 and is connected to the electric stove main body 1 by the connection means 14 constituted by 0. The thermistor 11 is used by being immersed in the food B placed in the cooking container A, and detects the temperature of the food B.

The electronic unit 12 provided in the electric stove main body 1 is configured such that when the mode switch 7 is set to the temperature control mode, the user operates the heating amount adjusting knob from the heating stop position to the heating position. The temperature control of the right heater H1 is started, and the heating amount of the right heater H1 is adjusted so that the target temperature set by the temperature switch 6 and the temperature of the food B detected by the thermistor 11 match.

When the mode switch 7 is set in the normal mode, the temperature control of the right heater H1 is not performed. In this case, the left heater H having no temperature control function
2, the heating is performed with the heating amount set by the heating amount adjustment knob 4a.

Next, the operation of the electric stove body 1 will be described with reference to FIG. FIG. 2 is a circuit diagram of the electric stove main body 1.
2. The grill heater H3 is controlled.

The electric stove body 1 is connected to a plug P via a terminal block T, and the user inserts the plug P into an outlet (not shown) and operates a power switch 48 to apply an AC voltage (200 V AC) to the electronic unit 12. Is supplied, and the heating amount adjustment knobs 4a, 4 shown in FIG.
An AC voltage is supplied to the right heater H1, the left heater H2, and the grill heater H3 via heating amount adjustment switches 25a, 25b, 25c which are turned ON and OFF in response to the operations of b, 4c, respectively.

The right heater H1 has inner and outer double heating elements 21a and 21b, the inner heating element 21a generates heat with 1KW of electric power, and the outer heating element 21b generates 1.2KW of electric power. Generates heat by electric power. A right heater H1 and a left heater H2 are provided between the heating element 21a and the heating element 21b.
And an operating contact 22 of a relay R4 for turning off (opening) when the total power consumption of the grill heater H3 is equal to or more than a predetermined value to cut off power supply to the outer heating element 21b; Contact 23 for shutting off power supply to the outer heating element 21b in conjunction with the operation of the double zone switch 13
Is provided.

The heating element 2 provided in the left heater H2
1c generates heat by 1.8 KW of electric power, and the heating element 21d provided in the grill heater H3 generates heat by 1.3 KW of electric power.

The heating elements 21a, 21b, 2
An overheat prevention switch 24 is connected to 1c and 21d,
When the heating value of each heating element becomes equal to or more than a predetermined value, the overheat prevention switch 24 connected to each heating element is turned off (open), and the power supply to each heating element is cut off. The overheat prevention switch 24 is a bimetal switch that is mechanically turned off (opened) when the ambient temperature becomes equal to or higher than a predetermined temperature. By the operation of the overheat prevention switch 24, the heating elements 21a, 22
It is possible to prevent b, 22c, and 22d from being abnormally overheated and deteriorated.

Heating amount adjustment switches 25a, 25b, 25
c operates in conjunction with the operation of the heating amount adjustment knobs 4a, 4b, 4c shown in FIG.
It is composed of three contacts 26, 27, 28 and a bimetal heater 29.

When the user sets the heating amount adjustment knob 4a from the heating stop position to the heating position, the contacts 26, 27, and 28 of the heating amount adjustment switch 25a are turned on (closed). When the contacts 27 and 28 are turned on, power is supplied to the heating elements 21a and 21b. When the contacts 26 are turned on, the electronic unit 12 recognizes that the user has operated the heating amount adjustment knob 4a.

The bimetal heater 29 is a set of a heater and a bimetal, and operates in conjunction with the contact 28. When the bimetal of the bimetal heater 29 is deformed by the heat generated by energization of the heater of the bimetal heater 29, the contact 28 is turned off (open) and the heating elements 21a, 21
1b, and the power supply to the heater of the bimetal heater 29 is cut off. Then, when the power supply to the bimetal heater 29 is cut off and the bimetal of the bimetal heater 29 gradually cools and returns to the original shape, the contact 28 is turned on (closed) again.
Then, the power supply to the heating elements 21a and 21b is restarted.

The setting of the operating position of the bimetal of the bimetal heater 29 (the position at which the contact 28 is turned off by the deformation of the bimetal) is changed according to the rotation setting position of the heating amount adjusting knob 4a. Since the amount of deformation of the bimetal increases with an increase in the temperature of the bimetal, by changing the operating position of the bimetal of the bimetal heater 29, the energization rate (the energization time per predetermined time) to the heating elements 21a and 21b can be reduced. Can be changed.

That is, when the setting of the heating amount adjusting knob is weak, the operating position of the bimetal is set so that the contact 28 is turned off (open) from the time when the amount of deformation of the bimetal of the bimetal heater 29 is small. Heating elements 21a, 21
(b) to reduce the rate of conduction to reduce the amount of heat generated by the heating element. When the setting of the heating amount adjusting knob 4a is strong, the operating position of the bimetal is set so that the contact 28 is not turned off (opened) unless the amount of deformation of the bimetal of the bimetal heater 29 is large. 2
1b is increased to increase the amount of heat generated.

The configuration and operation of the heating-amount adjusting switches 25b and 25c are the same as those of the heating-amount adjusting switch 25a, and the heating-amount adjusting switches 25a and 25b are respectively operated according to the operation of the heating-amount adjusting knobs 4a and 4b. Operate.

The electronic unit 12 includes a temperature control unit 30.
, Stop control means 31, relays R1 to R4, buzzer 32, and connection state detection means 47. Relay R
1, R2 and R3 are a right heater H1 and a left heater H, respectively.
2. It is for switching ON / OFF of the power supply to the grill heater H3. That is, when the coil of the relay R1 is energized, the operating contact 33 of the relay R1 is turned on.
(Closed), power is supplied to the right heater H1 and the relay R1
When the energization of the coil is cut off, the operating contact 33 of the relay R1 is turned off (open) and the power supply to the right heater H1 is cut off.

Similarly, for the relays R2 and R3, the relays R2 and R3 are turned on and off according to the energization and the cutoff of the coil of the relay R2.
2 and the operating contact 35 of the relay R3 are turned ON / OFF respectively, and the left heater H2 and the grill heater H3 are turned ON / OFF.
Power is supplied / cut off.

As described above, the relay R4 is for preventing the total power consumption of the right heater H1, the left heater H2, and the grill heater H3 from exceeding a predetermined value. Indicates that the operating contact 22 of the relay R4 is OF
F (open), power to the heating element 21b of the right heater H1 is cut off.

The power lamp 36 connected to the electronic unit 12 is turned on when the power switch 22 is in the ON state, and the right heater lamp 37, the left heater lamp 38, and the grill heater lamp 39 are controlled by the heating amount adjustment switch 25a, 25
Lights up when the contacts 26 of b and 25c are ON (closed). The buzzer 32 informs the user of an abnormality by a warning sound.

The temperature control means 30 is for controlling the temperature of the right heater H1. The temperature control means 30 detects the target temperature set by the user using the temperature switch 6 provided in the temperature setting device 5 and the temperature detected by the thermistor 11. Power is supplied to and cut off from the heating elements 21a and 21b of the right heater H1 so that the temperatures match. That is, when the temperature detected by the thermistor 11 is equal to or lower than the target temperature, the coil of the relay R1 is energized to turn on (close) the operating contact 33, and the thermistor 11
When the detected temperature exceeds the target temperature, the power supply to the coil of the relay R1 is cut off and the operating contact 33 is turned off.
F (open).

The heating stop means 31 (including the heating prohibiting means of the present invention) keeps the thermistor 11 even after a predetermined time has elapsed after the temperature control control of the right heater H1 by the temperature control control means 30 has started.
When the rise in the detected temperature due to is not detected, it is determined that the installation error is that the thermistor 11 is not properly immersed in the food B, and the operating contact 33 of the relay R1 is turned on.
FF (open) to cut off the power supply to the heating elements 21a and 21b. This prevents the food B from becoming hot.

The connection state detecting means 47 is connected to the thermistor 11.
By detecting whether the plug 9 connected to the electric stove body 1 via the connection cable 10 is inserted into the jack 8 provided in the electric stove main body 1, the thermistor 11 is connected to the electric stove main body 1 It is determined whether there is.

Referring to FIG. 3, jack 8 provided on electric stove body 1 has spring contact 50, and when plug 9 is not inserted, as shown in FIG. Closed. On the other hand, when the plug 9 is inserted, the spring contact 50 is pushed up by the plug 9 as shown in FIG.

The connection state detecting means 47 having the spring contact 50 detects a resistance value between the contact points 51 and 52 of the spring contact 50, and when the resistance value is higher than a first predetermined value. Determines that the plug 9 is inserted into the jack 8 when the spring contact 50 is in the open state, and when the resistance is lower than a second predetermined value smaller than the first predetermined value, the spring 9 It is determined that the contact 50 is closed and the plug 9 is not inserted into the jack 8.

A high-temperature caution lamp unit 40 is provided in the electric stove body 1 to alert the user that the glass top 2 is hot due to heat generated by the right heater H1 and the left heater H2. Contact 41 due to heat generated by heater H1
Is turned on, the lamp 42 of the high-temperature caution lamp unit 40 is turned on, the contact 43 is turned on by the heat generated by the left heater H2, and the lamp 44 of the high-temperature caution lamp unit 40 is turned on.

Next, the operation of the heating stop means 31 according to the result of the detection by the connection state detecting means 47 as to whether or not the thermistor 11 is connected will be described.

When the heating control mode is set to the temperature control mode by the mode changeover switch 7,
The temperature control means 30 performs temperature control so that the detected temperature of the food B by the thermistor 11 and the target temperature by the temperature switch 6 match, but when the thermistor 11 is not connected to the heating cooker main body, Temperature control cannot be performed.

Therefore, when the user operates the heating amount adjusting knob 4a to the heating position in the temperature control mode, the connection state detecting means 47 activates the heating stopping means 31 (including the heating inhibiting means of the present invention). When it is recognized that the thermistor 11 is not connected, the power supply to the coil of the relay R1 is cut off, and the heating by the right heater H1 is prohibited. Then, the buzzer 32 notifies the user that the thermistor 11 is not connected (first notification).

On the other hand, when the heating control mode is set to the normal mode, the temperature control by the temperature control means 30 is not performed, so that it is not necessary to connect the thermistor 11 to the cooking device body 1. However, the user
When it is erroneously recognized that the mode is the temperature control mode, it is conceivable to connect the thermistor 11 to the heating cooker main body 1 and operate the heating amount adjustment knob 4a to the heating position.

Therefore, the heating stop means 31 monitors the detected temperature of the food B even in the normal mode, and when the detected temperature exceeds a predetermined high temperature limit temperature (for example, 250 ° C.), the relay stops. The power supply to the coil of R1 is cut off, and the heating by the right heater H1 is prohibited. In addition, the buzzer 32 notifies the user of the fact that the temperature of the food is high by using a buzzer sound different from the first notification (second notification).

Thus, the cooking B is prevented from being heated beyond the high temperature limit temperature, and the fact that the setting of the heating control mode is incorrect for the user is distinguished from the first notification. Can be recognized.

Then, the food B in the normal mode
Is monitored irrespective of the detection result of the connection state of the thermistor 11 by the connection state detection means 47.
Therefore, the spring contact 50 of the jack 8 and the connection state detecting means 47 break down, and the thermistor 1
Even when it is not possible to accurately recognize whether or not the heating control unit 1 is connected to the heating cooker main body 1, the cooking object B may set the high temperature limit temperature due to erroneous recognition of the setting of the heating control mode by the user. Excessive heating can be prevented.

When the thermistor 11 is not connected to the cooking device body 1, the electronic unit 12 always detects that the resistance value of the thermistor 11 is infinite, that is, extremely low temperature (for example, -20 ° C.). You. Further, when the connection state detecting means 47 fails, the electronic unit 12 may erroneously recognize that the thermistor 11 is connected, even though the thermistor 11 is not actually connected.

In the normal mode, the monitoring by the heating stopping means 31 that the detected temperature of the thermistor 11 exceeds the high temperature limit temperature is performed regardless of the detection result of the connection state detecting means 47. When the state detecting means 47 fails, the electronic unit 12
Therefore, even though the thermistor 11 is not actually connected, it may be erroneously recognized that the thermistor 11 is connected, and it may be detected that the resistance value of the thermistor 11 is infinite.

As described above, the electronic unit 12 detects that the thermistor 11 is connected and that the resistance value of the thermistor 11 is infinite because the thermistor 11 has a disconnection failure or the connection state detecting means 47. Can be considered as either malfunctioning or not. Therefore, at this time, it is desirable to stop the heating by the right heater H1 and notify the user of the occurrence of these abnormalities.

In this embodiment, as shown in FIG. 3, the jack 8 of the type in which the spring contact 50 is opened when the plug 9 is inserted is used. A jack of a type that opens the spring contact 50 when pulled out may be used.

Further, in this embodiment, a glass stove-type electric stove is shown as the heating cooker. However, other types of electric stoves or gas stoves may be used.

[Brief description of the drawings]

FIG. 1 is an external view of a glass-top type electric stove, which is a cooking device of the present embodiment.

FIG. 2 is a circuit diagram of the electric stove shown in FIG.

FIG. 3 is a structural view of a jack provided in the electric stove shown in FIG. 1;

[Explanation of symbols]

1. Electric stove, 2. Glass, 3. Grill, 4a, 4
b, 4c: heating amount adjustment knob, 5: temperature setting device, 6: temperature switch, 7: mode changeover switch, 8: jack,
9: plug, 10: connection cable, 11: thermistor,
12 electronic unit, 13 double zone changeover switch, 14 connecting means, H1 right heater, H2 left heater, H3 grill heater, 21a, 21b, 21c, 2
1d: heating element, 25a, 25b, 25c: heating amount adjustment switch, 30: temperature control means, 31: heating stop means, 4
7 Connection state detecting means, 50 Spring contact

Continuation of the front page (72) Inventor Nagaya Kazuhiko 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi Rinnai Corporation (56) References JP-A-2-290430 (JP, A) JP-A-2-290428 (JP, A) JP-A-2-290426 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24C 7/04 301 H05B 3/00 320 H05B 3/00 330 F24C 3 / 12

Claims (2)

(57) [Claims] A heating means for heating the food; a temperature sensor immersed in the food and used to detect the temperature of the food;
Connecting means for detachably connecting the temperature sensor and the heating cooker main body; and a temperature for adjusting a heating amount of the heating means so that the temperature of the food detected by the temperature sensor coincides with a predetermined target temperature. Temperature control means for performing temperature control, a temperature control mode for performing temperature control by the temperature control means, and a normal mode for performing a heating operation with a heating amount set by a user without performing the temperature control. A mode switching means for switching, a connection state detecting means for detecting whether or not the temperature sensor is connected to the heating cooker main body, and the temperature sensor being connected to the heating cooker main body when in the temperature control mode. when it is detected by said connection state detecting means without, in the heating cooker having a heating inhibiting means for inhibiting the heating operation by the heating means, during the heating operation in the normal mode, the real In some cases, the temperature
Sensor is connected to the cooking device body
If the connection is not established due to the failure of the connection state detection means
If it is detected, the temperature detected by the temperature sensor is determined in advance.
A heating cooker provided with a heating stop means for stopping the heating operation by the heating means when it is detected that the temperature exceeds the high temperature limit temperature . 2. A connection cable having one end connected to the temperature sensor and the other end connected to a plug.
A plug provided in the cooker body, the plug being inserted and connected; and the connection state detecting means is provided in the jack, and the connection state is detected by a change in resistance between contacts of contacts that are opened and closed by the insertion of the plug. The cooking device according to claim 1, wherein the temperature of the cooking device is detected.