JP3203204B2 - 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 cooking device, and more particularly to a cooking device which supplies electric power to a heater while repeatedly exchanging an object to be cooked and an object to be cooked before heating. The present invention relates to a cooking device capable of continuously cooking an object.

[0002]

2. Description of the Related Art Conventionally, a heating cooker is provided with a main body case for removably storing an object to be cooked, a heater provided in the main body case, and a power supply circuit for supplying electric power to the heater. In some cases, a disconnection means of a power supply circuit is activated when the temperature inside the main body case rises excessively to stop the supply of power to the heater. For example, in a heating cooker such as an oven toaster, disconnection means, for example, a heat-sensitive opening / closing means such as a thermostat operates when a heating operation is performed again after forgetting to remove an object to be cooked from the main body case and heating the heater circuit. The power supply to the power supply is cut off to prevent abnormal heating of the main body case and ignition of the object to be cooked. When the temperature of the main body case decreases to a predetermined temperature, the thermostat automatically returns to start energizing the heater circuit.

[0003]

In the above-mentioned oven toaster, the cooking time usually set in advance, for example, if the object to be cooked is bread, the heating required to finish the toast with a desired baked color. The cooking time is set in a timer, and power supply to the heater is started. When the heating cooking time ends, power supply to the heater is stopped.
However, in a case where a plurality of objects are continuously heated and cooked by supplying power to the heater while repeatedly exchanging the objects to be cooked after heating and the objects to be cooked before heating, the object to be cooked is When the object is stored in the main body case and the electric power is supplied to the heater to start heating and cooking a new object to be cooked, the temperature of the main body case may have already risen to just before the operation temperature of the thermostat.

[0004] At this time, even if heating cooking is started, before the predetermined heating cooking time set by the timer elapses,
As a result, the thermostat operates and the power supply to the heater circuit is cut off. The stop of energization to this heater circuit
Although preferable for safety, heating cooking is interrupted until the thermostat automatically returns, so that the time required for return is added and the cooking time is extended. Further, even with a heat-sensitive opening / closing means other than the thermostat, for example, a heater circuit using a thermistor, heating cooking cannot be resumed until a reset operation or the like is performed. In particular, the thermostat has a thermal inertia based on the heat capacity of the solid, so that it is difficult to return immediately, and once activated, it becomes practically impossible to repeat heating and continuous operations.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the temperature of a main body case from excessively rising, and to take out a heated object to be cooked from a main body case. An object of the present invention is to provide a heating cooker capable of performing efficient and uninterrupted heating cooking when storing and performing heating cooking repeatedly and continuously.

[0006]

According to the present invention, there is provided a main body case for removably storing an object to be cooked, a heater provided in the main body case, and a power supply circuit for supplying electric power to the heater. The power supply circuit comprises: first disconnecting means for stopping power supply to the heater when the temperature in the main body case reaches a preset first temperature; and a preset disconnection means higher than the first temperature. A heating cooker comprising a second disconnecting means for stopping power supply to the heater when the temperature reaches the second temperature, and a switching means for selectively switching between the first disconnecting means and the second disconnecting means. Provided.

That is, the present invention comprises the first disconnecting means on the low temperature side, the second disconnecting means on the high temperature side, and the switching means for selectively switching these, so that the inside of the main body case is heated at a relatively low temperature. When cooking is performed, switching to the first disconnecting means can be performed, and when cooking is performed at a relatively high temperature, switching to the second disconnecting means can be performed. When performed, it prevents the heating cooking from being interrupted by the operation of the first disconnecting means on the low temperature side.

The present invention will be described based on a change in the temperature inside the main body case (hereinafter referred to as the inside temperature). FIG. 10 is a graph showing an example of a change in the internal temperature when heating and cooking are continuously performed by the oven toaster. First, an object to be cooked is stored in the oven toaster, a heater output and a cooking time are set, and power is supplied to the heater (time t0). In the first heating cooking, power supply to the heater is stopped after a predetermined cooking time has elapsed (time t1). Next, when the object to be cooked is removed from the inside of the refrigerator and the power supply to the heater is continued while repeating the operation of storing the food before the heating in the refrigerator, the temperature in the refrigerator increases. The temperature reaches the first temperature T1 (time t2). At this time, when the first disconnecting means is operated, the heating cooking is interrupted, and when the first disconnecting means is a thermosensitive opening and closing means such as a thermostat, the inside of the refrigerator is cooled and the thermostat automatically returns (time t3). Until you have to wait. Therefore, if the switching means is switched to the second disconnecting means in advance and the first disconnecting means is deactivated, the heating cooking can be continued in the refrigerator where the temperature in the refrigerator exceeds the first temperature.

[0009] If the cooking is continued in the refrigerator where the temperature in the refrigerator exceeds the first temperature, the temperature in the refrigerator reaches the equilibrium temperature Te when the above-mentioned heating cooking is continuously performed. However, if the supply of electric power to the heater is continued while the object to be cooked is not taken out from the inside of the container and the object to be cooked is stored in the container, the temperature in the container increases to reach the second temperature T2 (chain line). ). The second temperature T2 is set lower than the temperature T0 at which the object to be ignited in the refrigerator when the power supply to the heater is continued. That is, in the present invention, when it is assumed that the first temperature finishes the heating cooking in which the food to be cooked is stored in the refrigerator and power is supplied to the heaters only at the first time, the food to be cooked is stored in the refrigerator. When the supply of power to the heater is continued while the food to be cooked is stored in the refrigerator without being taken out from the refrigerator, the temperature is set from the viewpoint of preventing the food to be ignited in the refrigerator beforehand, When it is assumed that the cooked food is taken out of the main body case and the cooked food before cooking is newly stored in the main body case and heating and cooking are repeatedly performed continuously, the inside of the refrigerator is cooked. Equilibrium temperature T below the ignition temperature T0 of the object
It can be said that the temperature is set from the viewpoint of maintaining e.

Examples of the heater in the present invention include a sheathed heater comprising a resistance heating wire, a halogen heater using halogen light, an electromagnetic induction heater having a heating coil, and the like. The power supply circuit according to the present invention includes a power supply circuit to which a connection device connectable to a power supply, a power supply circuit board, a timer, a switch, and a control circuit board are connected.

[0011] The first temperature in the present invention is a temperature in a refrigerator when heating and cooking is performed at a relatively low temperature in the main body case. After removing the heater from the heater and stopping the operation of the heater, the time interval between the time when the object to be cooked is newly placed on the main body case and the heating and cooking is performed is relatively long, during which the main body case and the inside thereof are sufficiently cooled. The temperature when
The second temperature in the present invention is a temperature in a refrigerator when heating cooking is performed at a relatively high temperature in the main body case, and is a continuous heating cooking, that is, a heater is intermittently or continuously driven continuously. While heating the food while removing it from the main body case while heating the food to be newly placed on the main body case, and performing the heating cooking repeatedly and continuously. It indicates the temperature when the inside of the refrigerator is not cooled sufficiently.

The disconnecting means in the present invention includes a manually resettable fuse, a thermistor, and a thermostat. If at least one of the first disconnecting means and the second disconnecting means is constituted by a heat-sensitive switching element, automatic return can be performed without performing a manual return operation. When the first disconnecting means is composed of the first thermostat and the second disconnecting means is composed of the second thermostat, respectively, by utilizing the relatively large thermal inertia of the thermostat, the main body case and the inside of the case thereof are automatically returned after the operation until the automatic return. Can be cooled.

A first thermostat and a second thermostat are connected in series with the heater, and the switching means includes a first thermostat and a second thermostat.
When a switch is connected to the first thermostat by the changeover switch, the second thermostat is connected in series with the first thermostat. When the switch is switched to the first thermostat by the changeover switch, the second thermostat is connected in series. (1) The safety when the thermostat does not operate is increased.

[0014] The switching means includes a timer, the timer has a timed timer unit that can set the driving time of the heater in advance, and a continuous setting unit that can continuously operate the heater,
By switching to the first disconnecting means when the timed timer section is set and switching to the second disconnecting means when the continuous setting section is set, the driving time of the heater can be arbitrarily set by the timer, and during heating cooking, It is possible to heat the object to be cooked to a desired heating state while checking the state of the object being cooked. The continuous operation of the heater in the present invention is not limited to continuous supply of electric power to the heater, but also includes intermittent supply of electric power to the heater.

[0015] The maximum temperature in the main body case when power is supplied to the heater while repeating the operation of taking out the cooked food from the main body case after taking out the cooked food from the main body case and storing the cooked food in the main body case. When the temperature is balanced to a temperature between the first temperature and the second temperature, the first disconnecting means on the low temperature side is switched to the second disconnecting means when performing heating cooking in which the inside of the main body case becomes relatively high. In addition to the interruption of the heating and cooking due to the operation of the above, the interruption of the heating and cooking due to the operation of the second disconnecting means on the high temperature side can be prevented.

When the maximum temperature is 230 to 250 ° C., the first
If the heating cooker has a temperature of 220 ° C. and the second temperature of 350 ° C., it is possible to support a safe and various cooking menu. If the food is bread for toast,
It is possible to continuously supply toast, and it is highly convenient in restaurants and restaurants where a large amount of toast is supplied in a short period of time, or in a household with many members.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. Note that the present invention is not limited to this. 1 to 4 show an oven toaster as a heating cooker according to one embodiment of the present invention. As shown in FIG. 1, the oven toaster 10 includes a box-shaped main body case 1 made of a steel plate,
Door 2 rotatably attached to the front of body case 1
And a placement net 3 attached inside the main body case 1 for placing the object to be cooked, heaters 4 (4a, 4b) arranged above and below the placement net 3, respectively, and supplying power to the heater 4. And an operation panel 6 as a power supply circuit.

The main body case 1 is, as shown in FIGS.
An outer casing 11 constituting five surfaces excluding the front surface of the main body case 1;
It comprises a top plate 12, which is attached to the inside of the outer casing 11, and reflects the heat rays of the heater 4, a back plate 13, and left and right side plates 14, 15. The fixing holes 14a and 15a for fixing the heater are provided on the upper portions of the side plates 14 and 15, and the fixing holes 14b and 15b and the guiding holes 14c and 1c for fixing the heater are provided below the side plates 14 and 15.
5c are formed. A fan ventilation hole 15d is formed above the guide hole 15c of the right side plate 15. A tray 17 that can be pulled out forward is disposed on the upper surface of the bottom plate 16 of the outer casing 11, and a pivot portion (not shown) that pivotally supports the pivot of the door 2 is formed at the front end of the bottom plate 16. .

The door 2 includes a steel plate 22 having a window frame 21 in the center and a glass 23 attached to the window frame 21.
A handle 24 disposed on the upper front surface of the frame plate 22;
A pair of left and right hooks 25 is provided on the rear surface of the frame plate 22.

The mounting net 3 is a metal net member whose rear end is bent upward, and has a pair of horizontal projections 31 projecting outward from left and right side ends. This pair of horizontal projections 31 is
4c, 15c, and the hook 25 is locked to the front end of the placement net 3, so that when the door 2 is opened, the pair of horizontal projections 31 moves through the guide holes 14c, 15c, and the placement net 3 Is pulled forward. During this movement, the placement net 3 is held substantially horizontally by the guide holes 14c, 15c and the hook 25. The upper and lower heaters 4a and 4b are sheathed heaters in which a nichrome wire is covered with a ceramic tube, and are fixed to fixing holes 14a, 15a and 14b, 15b of the side plates 14, 15 by heater insulators 41 disposed at both ends. , Are supported in the main body case 1 substantially horizontally and parallel to each other.

Further, a fan 45 for agitating air and two thermostats 51 and 52 are arranged outside the right side plate 15. The fan 45 is arranged to face the ventilation hole 15d, and when blowing air toward the inside of the cooking chamber, the inside of the cooking chamber surrounded by the top plate 12, the back plate 13, the left and right side plates 14, 15 and the door 2 is provided. Stir the air to make the temperature distribution uniform. The two thermostats are a low temperature thermostat 51 with 145 ° C. break contacts and a high temperature thermostat 52 with 180 ° C. break contacts,
Each heat-sensitive surface is fixed in close contact with the outer surface of the right side plate 15. The thermostats 51 and 52 are both obliquely below the heater 4a and are located at substantially equal distances from the heaters 4a and 4b, and these heat-sensitive surfaces have substantially the same temperature when the heaters 4a and 4b and the fan 45 are driven. Become.

As shown in FIG. 5, the operation panel 5 includes a cooking timer 61 (timed timer section) capable of arbitrarily setting a heating cooking time, a menu switching key 62, an automatic toast key 66, and a burning color adjusting knob. 67, and lamps 63, 64, and 6 which are turned on by the operation unit.
5, 68, 69, and a display and notification unit including beep sound notification means (not shown). Lamps 63, 64, 65
Is 3 which can be switched by the menu switching key 62.
The lighting is performed in correspondence with each of the three cooking modes, that is, each of the three output setting values by the heater 4. The lamp 68 is set to the cooking mode of the bread when the automatic toast key 66 is pressed once, and is turned on. The lamp 69 is set to the cooking mode of the frozen bread when the automatic toast key 66 is pressed twice. Lights up together with the lamp 68. The burning color adjusting knob 67 sets the driving time (toast time) of the heater 4 corresponding to the indicated scale on the outer periphery.

FIG. 6 is a circuit diagram illustrating a power supply circuit in the heater 4 of the oven toaster 10. The power supply circuit 6 has a cooking timer 61 and a heater circuit connected in parallel, and the heater circuit has a low-temperature thermostat 51 and a high-temperature thermostat 52 connected in series to the heaters 4a and 4b connected in parallel. It comprises a bypass 56 for bypassing the low-temperature thermostat 51 and a relay switch 53 (switching switch) connected to the bypass 56. The outputs of the heaters 4a and 4b are controlled by triacs 54 and 55, respectively.

The set operating temperature of the low-temperature thermostat 51 and the high-temperature thermostat 52 is determined at a predetermined temperature at a predetermined space position where the object to be cooked is placed in the refrigerator, and the heat-sensing of the side plate 15 to which the thermostats 51 and 52 are fixed. The temperature is replaced by the temperature of the surface, and is correlated with the output of the heater, the shape and structure of the inside of the refrigerator, and the type and amount of the object to be cooked. It is assumed that the temperature is lower than the temperature at which bread is ignited in the refrigerator, which is previously determined by an experiment, and specifically, the temperature 220 in the refrigerator which is set based on the temperature at which bread is ignited on the placement net 3 is set. ° C and 350 ° C
Is a low-temperature thermostat 51 and a high-temperature thermostat 5
2 correspond to 145 ° C. and 180 ° C., respectively. The temperature at which the bread ignites in this refrigerator is
The internal temperature is around 350 ° C.

FIG. 7 is a control block diagram of the oven toaster 10. Oven toaster 10 is CP
The control unit 60 includes a microcomputer having a U, a ROM, a RAM, a timer, and the like. The control unit 60 includes a low-temperature thermostat 51 (first disconnecting means), a high-temperature thermostat 52 (second disconnecting means), a fan 45, a cooking timer 61, a menu switching key 62, an automatic toast key 66, a burning color adjusting knob 67, and a lamp. 63, 64,
65, 68, 69, the input / output units of the beep sound notification unit and the relay switch 53 are connected. The control section 60 in the oven toaster 10 is shown by the control flowcharts of FIGS.
The operation of is described below.

Initial setting is performed in step S1,
If it is determined in step S2 that the automatic toast key 66 has been pressed once, the process proceeds to step S3, where the toast lamp 68 is turned on and the output of the heater 4 is set. Next, in step S4, it is determined whether the automatic toast key 66 has been pressed twice. If YES, step S
In step 5, the frozen bread lamp 69 is turned on, and then in step S6, an initial toasting time is set.

As the initial toasting time, a continuous output time set in advance in accordance with the designated position of the burning color set by the burning color adjusting knob is commanded. If the determination in step S4 is NO, the process also proceeds to step S6. Next, step S7
Then, the relay switch 53 is operated to switch to the high-temperature thermostat 52. High temperature thermostat 5
After the switching to 2, the heater 4 is driven with the set output and the driving of the fan 45 is started in a step S8 (time t0 in FIG. 10). Next, in step S9,
It is determined whether the set toast time has elapsed.
When the set time has elapsed, in step S10, the heater 4
Is stopped (time t1 in FIG. 10). In step S11, time measurement is started simultaneously with the stop of the heater 4. Next, step S
When it is determined in step 12 that the automatic toast key 66 has been pressed, the toast lamp 68 is turned on and the output of the heater 4 is set in step S13.

Next, in step S14, the next toast time is set. As the toast time for the second and subsequent times, a continuous output time set in advance is instructed according to the result of the time measurement in step S11 and the designated position of the burning color set by the burning color adjusting knob. However, if the time measurement result exceeds a preset time limit (for example, 7 minutes), step S
Move to 1. Next, in step S15, the relay switch 53 is operated to switch to the high-temperature thermostat 52. After switching to the high temperature thermostat 52, in step S16, the heater 4 is driven with the set output and the driving of the fan 45 is started. Next, in step S17, it is determined whether or not the high temperature thermostat 52 has been activated.

If the toast time after the second time has elapsed without operating the high temperature thermostat 52, the heater 4 is stopped and time measurement is started at the same time (steps S18 to S18).
20). Next, the process proceeds to step S21, and if it is determined that the automatic toast key 66 has been pressed, the process proceeds to step S13.

On the other hand, if it is determined in step S17 that the high-temperature thermostat 52 has been activated, the power supply to the heater 4 is started after the high-temperature thermostat 52 is automatically reset (FIG. 10A). (Steps S22 to S24). If the toasting time has not elapsed at the time when the power supply to the heater 4 is started in step S24, the process proceeds to step S17.

If the menu key 62 is depressed in step S25 after the initial setting in step S1, the process proceeds to step S26, where the lamp 6 of the selected menu is displayed.
Any one of 3 to 65 is turned on and the output of the heater 4 is set based on this menu. In step S27, a preset heating cooking time corresponding to the selected menu or the heating cooking time set by the cooking timer 61 is commanded. Then, in step S28, the relay switch 53 is operated to the low temperature thermostat 51. Is switched. After switching to the low temperature thermostat 51, the heater 4 is driven with the set output and the drive of the fan 45 is started in the next step S29. Next, in step S30, it is determined whether the low temperature thermostat 51 has been activated.

If the menu cooking time has elapsed without operating the low-temperature thermostat 51, the driving of the heater 4 is stopped and the heating cooking is completed (steps S31 to S31).
2). On the other hand, in step S30, the low-temperature thermostat 51
Is activated, the heater 4 is disconnected from the power supply (time t2 in FIG. 10), and the power supply to the heater 4 is started after the low-temperature thermostat 51 is automatically reset (steps S33 to S35). If the menu cooking time has not elapsed at the time when the power supply to the heater 4 is started in step S35, the process proceeds to step S30.

Thus, the above-mentioned oven toaster 1
0 is automatically switched to the low-temperature thermostat 51 when the menu is set when the menu of the heating cooking is other than the toast or when the continuous heating is not performed, and the menu of the heating cooking is set to the cooking of the toast. In such a case, the temperature is automatically switched to the high-temperature thermostat 52, so that the temperature in the refrigerator is prevented from excessively rising, and the cooked food after cooking and the cooked food before cooking are not heated. When electric power is supplied to the heater while repeating the replacement, and the plurality of objects to be cooked are continuously cooked, efficient heating cooking without interruption can be performed.

In the control operation of the control unit 60, the switching to the high-temperature thermostat 52 is performed after the initial toast time is set (step S6). The switching to the thermostat 51 may be continued. Accordingly, the low-temperature thermostat 51 is activated only during the first heating of the toast, so that the safety is enhanced.

FIG. 11 shows another embodiment of the switching means. Here, the operation unit includes a timer 71, and the timer 71 includes a time limit timer unit 73 that can set the driving time of the heater 4 in advance and a continuous setting unit 72 that can continuously operate the heater 4. Is set to the low-temperature thermostat 51 (first disconnecting means) when is set, and is switched to the high-temperature thermostat 52 (second disconnecting means) when the continuous setting section 72 is set.
If the timer 71 is set in the timed timer section 73, the driving time of the heater 4 can be set to an arbitrary heating and cooking time, and if the timer 71 is set in the continuous setting section 72, the heating and cooking state of the cooking object during the heating and cooking can be confirmed. While heating, the object can be heated to a desired heating state. FIG. 12 shows the timer 7
1 shows a power supply circuit of a heater 4 provided with a heater 1.

[0036]

According to the heating cooker of the present invention, since the first disconnecting means on the low temperature side and the second disconnecting means on the high temperature side and the switching means for selectively switching these are provided, the inside of the main body case is compared. When heating cooking is performed at a relatively low temperature, the first disconnecting means can be switched, and when heating cooking is performed at a relatively high temperature, the switching can be switched to the second disconnecting means. When heating cooking is performed, interruption of heating cooking due to operation of the first disconnecting means on the low temperature side can be prevented.

Further, the heater removes the object to be cooked from the main body case from the main body case, and repeats the operation of storing the object to be cooked before the heat cooking in the main body case. The maximum temperature of the first temperature and the second temperature
In the case of performing the heating operation in which the inside of the main body case becomes relatively high by switching to the second disconnecting means by performing the configuration so as to balance the temperature with the temperature, the heating cooking by the operation of the first disconnecting means on the low temperature side is performed. In addition to interruption of heating, it is possible to prevent interruption of heating and cooking due to operation of the second disconnecting means on the high temperature side.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the appearance of an oven toaster according to an embodiment of the present invention.

FIG. 2 is a sectional view of the oven toaster of FIG. 1 taken along the line II.

FIG. 3 is a sectional view of the oven toaster of FIG. 1 taken along the line III.

FIG. 4 is a cross-sectional view of the oven toaster of FIG. 1 taken along line IV.

FIG. 5 is a view for explaining an operation panel of the oven toaster in FIG. 1;

FIG. 6 is a power supply circuit diagram of a heater of the oven toaster of FIG.

FIG. 7 is a control block diagram of the oven toaster of FIG. 1;

FIG. 8 is a flowchart showing one embodiment of a control unit of the oven toaster of FIG.

FIG. 9 is a flowchart showing one embodiment of a control unit of the oven toaster of FIG.

FIG. 10 is a graph illustrating the internal temperature of the oven by the control unit of the oven toaster of FIG. 1;

FIG. 11 is a view showing a cooking timer of a heating cooker according to another embodiment of the present invention. The corresponding flowchart.

FIG. 12 is a power supply circuit diagram of a heater of the cooking device of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 4 Heater 6 Power supply circuit 10 Oven toaster 51 Low temperature thermostat (1st disconnection means) 52 High temperature thermostat (2nd disconnection means) 53 Relay switch (switching means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-28884 (JP, A) JP-A-55-1108 (JP, U) JP-A-1-41518 (JP-A-2-1344941) (JP, U) (58) Field of investigation (Int. Cl. ⁷ , DB name) A47J 37/06

Claims (1)

(57) [Claims] 1. A main body case for removably storing an object to be cooked, a heater provided in the main body case, and a power supply circuit for supplying power to the heater. First disconnecting means for stopping power supply to the heater when the temperature in the case reaches a preset first temperature; and heating the heater when the temperature in the case reaches a preset second temperature higher than the first temperature. a second isolator means for stopping the supply of power to, and and a selectively switching the switching means of these first isolator means and the second isolator means, the food before cooking and the food after cooking With
Supply power to the heater while repeating the replacement
If the food to be cooked is to be cooked continuously,
When automatic switching to the road means is performed and continuous cooking of the plurality of objects is not performed
Is a heating cooker in which automatic switching to the first disconnecting means is performed .