JPS6346329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot air circulation type cooking device in which air in a cooking chamber is passed through an air passage equipped with a heater to be heated and then returned to the cooking chamber.

[Prior art]

Generally, this type of cooker is equipped with a heater as a means of heating the food to be cooked, but this heater is located above the top plate of the cooking chamber, and one end is connected through the suction port provided on the top plate of the cooking chamber, and the other end is connected to the heater. are arranged in ventilation passages that communicate with the cooking chamber through the air outlet, and a fan installed in one end of the ventilation passage introduces hot air from the cooking chamber into the ventilation passage, and the heater After heating, it is configured to be circulated back into the cooking chamber from the air outlet. By the way, a nozzle is provided at the other end of the ventilation path that opens facing the air outlet, and this nozzle is connected to a motor via a cam, crank, etc. in order to change the direction in which hot air is blown into the cooking chamber. In addition to being continuously swung within a predetermined range by the motor, it is also positioned and stopped in a desired direction. This means of positioning the nozzle in a designated direction usually involves installing a plurality of cam switches in the rotating range of a cam that interlocks with the nozzle, so that the nozzle can be oriented toward the center, inside, or outside of the turntable on which food is placed, respectively. The motor is stopped when a detection means is installed to detect the orientation of the nozzle, which is installed to operate individually, and a cam switch is activated, which operates in accordance with the orientation of the nozzle, which is determined according to the selected type of cooking. The device includes means for aligning the nozzle with a designated direction, and when it is detected that the nozzle is correctly set, a heater or the like is driven to start cooking.

However, if a failure occurs in the nozzle drive system due to aging, etc., and the nozzle stops at the same position as the specified direction, the
Since the nozzle direction and the designated direction do not match, the heater will not be driven, and the cook will have to realize that the heater has not been driven until after the timer setting time has ended and the food has been taken out, resulting in the inconvenience of waste.

〔the purpose〕

The present invention has been made in view of the above circumstances, and its purpose is to rotate or swing the nozzle at a constant cycle by the motor.
Therefore, if you specify the direction of the nozzle according to the type of cooking, if there is no abnormality in the nozzle drive system, the nozzle will match the instructed direction at least once within a certain period of time; By focusing on the fact that if an abnormality exists, the nozzle does not match the indicated direction even after a certain period of time has passed, it is easy to detect whether there is an abnormality in the nozzle drive control system, notify the cook, and improve the cooking process. To provide a hot air circulation type cooker which eliminates waste in the cooking process.

〔composition〕

The cooking device according to the present invention is a hot air circulation cooking device in which air heated by a heater is blown into the cooking chamber through a nozzle whose direction is variable, and as shown in FIG. means A and means C for specifying the direction of the nozzle according to the type of cooking selected and specified by the cooking specifying means B;
and means D for stopping the nozzle when the direction of the nozzle detected by the detection means A matches the specified direction; and means E for displaying an abnormality when the direction of the nozzle does not match the specified direction within a certain period of time. It is characterized by comprising the following.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments in which the present invention is configured as a microwave oven. FIG. 1 is a schematic front cross-sectional view of a cooking device according to the present invention, and FIG. 2 is a perspective view showing a nozzle drive system, in which 1 is a cooking chamber, 2 is a turntable, and 3 is food to be cooked. It shows. A hot air ventilation path 13 containing a built-in heater 12 is arranged above the top plate 11 of the cooking chamber 1. One end of the ventilation path 13 passes through a hot air inlet 11a bored in the top plate 11, and the other end is also connected to the top plate 11. Each of the hot air outlets 11b provided in the plate 11 communicates with the cooking chamber 1, and the ventilation path 13
A blower 14 that is rotationally driven by a motor 14a is disposed inside the one end, and an L-shaped nozzle 15 that changes the hot air blowing direction is installed inside the other end. It is rotatably supported on the peripheral wall, and the hot air is sucked by the blower 14 through the hot air suction port 11a, and the heater 1
After being heated at step 2, it is blown out into the cooking chamber 1 through the nozzle 15 and the outlet 11b, and is circulated.

As shown in FIG. 2, one end of an L-shaped operating rod 15a is fixed to the outer peripheral wall of the nozzle 15, and the other end penetrates the peripheral wall of the ventilation passage 13 and projects outward. At the other end of this operating rod 15a is a connecting rod 1.
One end of the connecting rod 15b is pivotally supported, and the other end of the connecting rod 15b is pivotally connected to the side wall of the cam 16 via an arm 15c. The cam 16, together with other cams 17 and 18,
It is fixed to a shaft 20 connected to the output shaft of a motor 19, and a contact rod 21 of a cam switch 21, 22, 23 is provided on the outer peripheral surface of each cam 16, 17, 18, respectively.
a, 22a, and 23a are brought into sliding contact as cam followers, and are activated and stopped by the rotation of each cam 16, 17, and 18.
The cam 16 operates the cam switch 21 when the nozzle 15 faces toward the center of the turntable, and the cam 17 operates the cam switch 22 when the nozzle 15 faces toward the inside of the turntable.
Further, the relative positions of the cams 16, 17, 18 and the cam switches 21, 22, 23 are set so that the cam 18 operates the cam switch 23 when the nozzle 15 faces toward the outside of the turntable.
In addition, 25 in the figure is a magnetron, and 26 is a waveguide.

FIG. 3 is a block diagram showing the control system of the product of the present invention. In the figure, 30 is an arithmetic control unit composed of a microcomputer, etc., and 31 is a heating energy control unit including the heater 12, magnetron 25, and their drive circuit. 32 is a cooking temperature control unit including a thermistor 32a, a volume for setting the cooking chamber temperature 32b, and a voltage comparator 32c; 33 is an information input unit consisting of a keyboard for inputting cooking type, cooking time, etc. , 34 are a hot air blowing nozzle 15, a driving motor 19, and cam switches 21, 22, 23.
35 is a door position detection unit including a switch 35a that is activated by opening and closing the door; 36;
Reference numeral 37 indicates a blower control unit including the blower 14 and its driving motor 14a, and 37 a display unit that displays the contents input from the information input unit 33 and abnormalities of the nozzle control unit 34.

FIG. 4 is a schematic diagram of the keyboard serving as the information input section 33 and the display section 37. The keyboard includes grill strong and weak setting keys 33a, 33b, oven setting key 33c, start key 33d, and cancel key 3.
3e, number keys 33f from "0" to "9" for setting cooking time, temperature setting lever 33g, etc. For example, when cooking for 15 minutes with the cooking condition set to "grill strong", grill strong key 33a, "1",
Cooking is started by pressing the start key 33d after pressing each of the numeric keys 33f, ``5'', ``0'', and ``0''. Note that when the cancel key 33e is pressed, all of the above-mentioned input conditions are reset, returning to the initial state.

When the cooking conditions are input through the information input section 33 as described above, the display section 37 not only lights up the section displaying "Grill Strong" but also displays "1", which is the cooking time.
The numbers "5", "0", and "0" will be displayed, and if there is an abnormality in the nozzle control system as described later and the nozzle direction cannot be set in the indicated direction, the number display will show E, The four characters E, E, and E are now displayed.

The arithmetic control unit 30 stores a timer register (indicated by TIMER) for storing cooking time and nozzle control unit abnormality symbol, a counter register (indicated by NOZZLE TIMER) for detecting nozzle control unit abnormality, and a desired cam switch setting depending on the type of cooking. It is equipped with a storage area such as a value register (indicated by CAM), stores information input from the information input section 33, displays it on the display section 37, and receives the signal of the switch 35a from the door position detection section 35. determines whether the door is open or closed, and also receives the output of the comparator 32c from the cooking temperature control section 32 to determine whether the cooking chamber temperature has reached the set value input from the temperature setting lever 33g. In addition, the nozzle control unit 34 controls the actual direction of the nozzle 15 using the cam switch 21,
It is detected by taking in the output signals of 22 and 23, and it is determined whether this direction matches the instruction direction. When the input of the cooking conditions is completed, thermal energy control is performed to satisfy the input cooking conditions. Part 31,
A control signal is output to the blower control section 36 and the nozzle control section 34, and if there is an abnormality in the nozzle control section 34, this abnormality is displayed on the display section 37.

Further, the following flags are set in the calculation control unit 30. That is, the nozzle 15 does not match the desired indicated direction (value stored in the cam register) even after the required time has elapsed for the nozzle 15 to make one reciprocation by the motor 19 and return to the old position, that is, the nozzle control unit 3
A flag indicating that there is an abnormality in 4 (indicated by ERROR), a flag indicating that each grill high processing, low grill cooking, and oven cooking are set (respectively)
(indicated by GH, GL, OVEN), grill strong key 33
a, a flag (indicated by TM) indicating a state in which the grill weak key 33b and the oven key 33c have been operated and it is now possible to accept input using the numeric key 33f;
and a flag (indicated by TMF) indicating that input using the numeric key 33f has been accepted.

Next, the control contents will be explained according to the flowcharts shown in FIGS. 5 and 6. First, when the power is turned on, the cooking time timer register (TIMER) in the arithmetic control unit 30, a flag indicating an abnormality in the nozzle control system (ERROR), and a flag indicating that an input has been made using the grill strong, weak, and oven keys are activated. (GH, GL, OVEN), the flag (TMF) indicating that input using the numeric keys has been accepted, and (TIMER←0, ERROR←
0, TMF←0, GH, GL, OVEN←0), and in the step, a flag (TM) indicating that input using the numeric keys is possible, a flag indicating whether the nozzle motor 19 is on/off (NOZZLE)
is reset, (TM←0, NOZZLE←
Further, in step 0), output-related resets such as turning off the heater 12, turning off the blower, and turning off the nozzle motor are performed, and when these resets are completed, the subroutine (step) shown is entered. Next, a subroutine (step) is entered to perform keyboard input, and it is checked whether the cancel key 33e has been operated (step), and the nozzle flag ERROR is checked to determine whether there is an abnormality in the nozzle control unit (step). ), if there is an abnormality, return to step and repeat the above process, but up to this point, the nozzle control section abnormality flag ERROR has been cleared in step as described above, so proceed to step and strengthen the grill. It is determined whether there is an input using the key 33a, whether there is an input using the grill weak key 33b, and whether there is an input using the oven key 33c (step).

When an input is made using the grill strong key 33a, a signal "1" that specifies the nozzle direction so that the nozzle direction faces the center of the turntable is written in the cam register CAM (CAM←1), and the number key 33f is also input. A flag TM indicating that an input is possible with the grill key 33a and a flag GH indicating that an input with the grill strong key 33a has been set are set (TM←
1, GH ← 1) Flag GL indicating that an input has been made using the grill weak key 33b, oven key 33
Flag OVEN indicating that input by c was received
initializes this (GL←0, OVEN←0) (step 8a) and returns to the step to display these contents.

Similarly, when an input is made using the grill weak key 33b, a signal "2" is written to the cam register to specify the nozzle direction so that the nozzle direction faces the inner side of the turntable (CAM←2).
At the same time, a flag TM indicating that input using the numeric key 33f is possible, and a flag GL indicating that input using the grill weak key 33b has been made are set (TM←1, GL←1), and input using the grill strong key 33a is set. The flag GH indicates that the oven key 33c has been input.
OVEN initializes this (GH←0, OVEN←
0) (step 9a), return to step.

When an input is made using the oven key 33c, a signal "3" is written in the cam register to specify the nozzle direction so that the nozzle direction faces a position closer to the outside of the turntable (CAM←3), and the same process as above is performed. Set flag TM and OVEN (TM←1, OVEN←1), and set flag GH,
GL initializes this (GH←0, GL←0) and returns to the step to display these contents.

In addition, each grill strong key 33a and grill weak key 33
b. When no input has been made from any of the oven keys 33c, it is determined whether or not an input has been made using the numeric keys 33f (step), and if an input has been made, it is determined whether the input using the numeric keys 33f can be accepted. The contents of the graph TM indicating that the value is "1" are checked. This flag TM is grill strong, weak, oven key 33a, 33b, 33c
is set when any one of the grill strong and weak keys 33f is operated, and the input of the numeric key 33f selected thereafter is enabled.
Even if the numeric key 33f is operated prior to operating the keys 33a, 33b and oven key 33c, the input is not accepted and the cook is forced to input in a predetermined order.

If the input by the numeric key 33f is not accepted in the step, it remains as is, and if it can be accepted, the cooking time timer register is replaced with the input numeric value (TIMER position) numeric key 33
Flag indicating that input by f has been accepted
After setting TMF (TMF←1) (step), return to step.

If no input is made using the numeric keys 33f, it is determined whether or not the start key 33d is operated (step).
When 3d is not being operated, the steps ~
Repeat the step process at high speed.

In addition, when it is determined that the start key 33d has been input in the step, the number key 33
It is determined whether the input by f is accepted and whether the door of the cooker is closed (step). If the input by numeric key 33f is not accepted and the door is open, the same process is performed. The process returns to step 1, and if the input using the numeric key 33f is accepted and the door is closed, it is determined whether or not the cooking time is stored in the cooking time storage timer register (step). If not, return to step, and if stored, move to step to enter operation mode, drive blower 14, take in signals from cam switches 21, 22, 23 to arithmetic control section 30 (step). Nozzle 15 from signal
It is determined whether or not the direction matches the indicated direction (step), and if it matches, the nozzle motor 19 is stopped (step 〓〓), and the temperature in the cooking chamber 1 is input through the temperature setting lever 33g. Determine whether the temperature is higher than the set temperature (Step 〓
If the temperature is higher than the set temperature, the process moves to step 〓〓 and the heater is stopped, and if the temperature is lower than the set temperature, the heater 12 is driven (step 〓〓).

On the other hand, if the direction of the nozzle 15 does not match the indicated direction in the step, the nozzle motor 1
9 (Step 〓〓), then check the flag NOZZLE indicating the drive of the nozzle motor 19 to see if the nozzle motor 19 has stopped (NEZZLE
= 0) (step), and nozzle motor 1
9 has not been driven, that is, the nozzle motor 19 has just been driven for the first time.
Set the NOZZLE flag (Step 〓〓) and set the nozzle control timer register (NOZZLE TIMER).
Initializes (step 〓〓).

The initial value of the nozzle control timer is set to a value longer than the time required for the cams 16, 17, 18 to make one reciprocation by the motor 19. For example, cams 16, 17,
If it takes 10 seconds for the nozzle 18 to make one rotation, the initial value set in the nozzle timer may be a value such that the time required to count down to zero is 10 seconds or more, for example, 11 seconds.

The set value of NOZZLE TIMER is counted down sequentially (step 〓〓), and NOZZEL TIMER = 0.
If it is not zero, the heater is turned off (Step 〓〓).Then, although not shown in detail, the display, cancellation key detection, door detection, TIMER decrease time, etc. After processing, the process returns to the step again, the blower is turned on and the cam switch is input (step), and it is determined whether the nozzle direction is the indicated direction (step).

If the nozzle direction is different from the indicated direction, turn on the nozzle motor (Step 〓〓),
It is determined whether NOZZLE=0 or not (step), but since NOZZLE is set to 1 at step 〓〓, we move to step 〓〓 and select the previous NOZZLE.
A countdown is performed following the TIMER countdown (Step 〓〓).

The reason for setting NOZZLE=0 and NOZZLE←1 is to detect one rotation of the cams 16, 17, and 18. That is, when the nozzle motor is on, in other words, when the nozzle direction is not in the indicated direction, the cam 16
If the time required for one rotation of cams 17 and 18 is exceeded, an abnormal condition will occur, but the NOZZLE flag is used as a reference for measuring one rotation of these cams 16, 17 and 18, and the timing is started from the time when this flag is changed from 0 to 1. We are planning to start. If NOZZLE TIMER=0, in other words, the nozzle 15
If the direction of does not match the indicated direction,
At the same time as setting the ERROR flag (ERROR←1), EEEEH is set in the timer register for cooking time setting.
is written (Step 〓〓), and returns to the step to initialize the output relations, that is, to turn off the heater, blower, and nozzle motor, and also to display an abnormality in the nozzle control section at the step. Note that in this state, the process returns to the step after moving from step to step, so the process from the step is repeated, and the EEEE display is maintained unless the cancel key 33e is pressed, ensuring that the cook is informed of the abnormality. You will get it. Cancellation key 33
When e is pressed, the process returns to the step, and as a result, the flag indicating an abnormality in the nozzle control system is also reset in the step, and the abnormality display disappears.

Next, to explain the outline of the above-mentioned control contents according to the actual operating procedure, for example, if you press the grill strong key 3
Press 3a, then press number key 33 to set cooking time to 15 minutes.
Suppose that you input "1", "5", "0", "0", etc. in f, and then press the start key 33d. When the grill strong key 33a is pressed, the inputs from the cam switches 21, 22, 23 as the direction of the nozzle 15 are instructed to be "1", that is, the nozzle 15 is directed to the center of the turntable 2, so the current direction of the nozzle 15 is If the orientation is other than this, the nozzle motor 19 is driven, and if the nozzle control unit 34 is normal, the outputs from the cam switches 21, 22, and 23 become "1" within at least a certain period of time (for example, 10 seconds). , the nozzle motor 19 is stopped and the nozzle 15
is positioned toward the center of the turntable 2 and stopped. Further, the cooking time inputted using the numeric key 33f is set in the timer register, and when the nozzle 15 is turned in the indicated direction and stopped as described above, the heater 12 is driven and cooking is started.

On the other hand, if there is an abnormality in the nozzle control section 34, the nozzle 15 will not be driven, and the cam switches 21, 22, 23 will not be activated even after a certain period of time, that is, 10 seconds.
The output from the nozzle timer does not become "1", the nozzle timer setting value counts down to zero, and the display section 37
The characters EEEE are displayed on the screen to notify the cook of an abnormality in the nozzle control unit 34 before the cook leaves the cooker.
This eliminates the waste of knowing that the heater 21 has not been driven until the cooking time timer reaches zero, that is, 15 minutes have passed. Of course, in this state, the heater 12 is not driven, and therefore no cooking is performed.

〔effect〕

As described above, in the present invention, if the nozzle control section is normal, the nozzle direction will match the indicated direction within a predetermined time, but if the nozzle control section is abnormal, the nozzle direction will match the indicated direction even after the predetermined time has elapsed. Since the system detects an abnormality in the nozzle control section based on the fact that the cooking time does not match, and displays the abnormality, it is possible to eliminate the inconvenience of the cook noticing an abnormality in the nozzle control section only after the cooking time setting timer reaches zero. Moreover, the device itself is simple and can be easily applied to conventional cooking appliances, and the present invention has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the present invention, Fig. 2 is a perspective view showing a nozzle and its drive system, Fig. 3 is a block diagram showing a control system of the product of the present invention, and Fig. 4 is a keyboard and A schematic diagram of the display section, FIGS. 5 and 6 are flowcharts showing the control contents of the control system of the present invention,
FIG. 7 is a functional block diagram of the main parts of the cooking appliance of the present invention. 1...Gooking room, 2...Turntable, 3...Food,
11...Top plate, 11a...Suction port, 11b...Blowout port,
12...Heater, 13...Air passage, 14...Fan, 1
5... Nozzle, 15a... Operating rod, 15b... Connecting rod, 1
6, 17, 18... cam, 21, 22, 23... cam switch, 30... arithmetic control section, 31... thermal energy control section, 32... cooking chamber temperature control section, 33... information input section, 34... nozzle control section, 35 ...Door position detection section, 36...Blower control section, 37...Display section.

Claims (1)

[Claims] 1 In a hot air circulation type cooking device in which air heated by a heater is blown into the cooking chamber through a nozzle whose direction is variable, there is a detection means for detecting the direction of the nozzle, and a means for detecting the direction of the nozzle according to the type of cooking selected and specified. A means for specifying a direction, a means for stopping the nozzle when the direction of the nozzle detected by the detection means matches the specified direction, and a means for displaying an abnormality when the direction of the nozzle does not match the specified direction within a certain period of time. A cooking device characterized by comprising means.