JP3654376B2 - Thermal power control device in continuous rice cooker - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a thermal power control device in a continuous rice cooker.
[0002]
[Prior art]
Conventionally, Japanese Patent Publication No. 2-45888 discloses a gas cooker automatic opening and closing device of a continuous rice cooker. This is an apparatus that automatically opens and closes a gas cock that controls gas supply to a gas burner, which is a heat source for cooking rice in the rice cooking process, and automatically ignites and extinguishes the gas burner. And at the start of rice cooking, the gas burner immediately before the first pot is transferred is automatically ignited one after another, so there is no wasted air combustion at the start of cooking, and the gas burner just after the last rice cooker passes Since the fire is automatically extinguished, wasteful air combustion is eliminated when rice cooking is completed, and gas consumption can be reduced.
[0003]
Japanese Examined Patent Publication No. 51-14590 discloses a continuous rice cooking method that does not require skillful operation such as heating and reducing, and can always expect a good flavored cooking. This means that the position of the gas burner is fixed at a distance that allows the most efficient heating from the beginning of rice cooking until most of the water in the rice cooker is absorbed, and after that, the position of the gas burner is kept away from the rice cooker, and It is fixed at a position where the temperature in the rice cooker does not decrease.
[0004]
[Problems to be solved by the invention]
However, although the former continuous rice cooker can automatically ignite and extinguish the gas burner, it has not been able to adjust the heating power in each step of the rice cooking process. On the other hand, in the latter continuous rice cooking method, the setting of the position of the gas burner is brought closer to the rice cooker in the initial stage of rice cooking, and thereafter it is further away from the rice cooker to adjust the heating power by keeping the gas supply amount constant. However, the burner away from the rice cooker has the disadvantage of high gas consumption.
[0005]
In view of the above problems, the present invention is to provide a continuous rice cooker that can perform uniform cooking without unevenness by automatically adjusting the heating power according to each step of the rice cooking process. Let it be an issue.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention transfers a rice cooker by an endless conveyer provided in a rice cooker, and heats the rice cooker by a plurality of blocks of gas burners installed below the conveyer to cook rice. In continuous rice cooker,
A pot lid temperature detector for detecting the surface temperature of the recess provided in the pot lid of the rice cooker;
Thermal power changing means for changing the thermal power of the gas burners of the plurality of blocks,
The detection signal from the pot lid temperature detector is compared with the preset pot temperature pattern from the start of rice cooking to the completion of rice cooking, and the detection signal from the pot lid temperature detector is converted into the pot temperature pattern. A control device for controlling each of the plurality of heating power changing means to match,
The technical means of providing
[0007]
[Action]
When the rice cooker is transferred by a conveyor conveyer provided in the rice cooker and heated by a plurality of blocks of gas burners installed below the conveyor, the thermal power of each gas burner group is changed from the start of rice cooking to the completion of rice cooking by the thermal power change means. It is controlled to the optimum heating power. In other words, the pot lid of the rice cooker is provided with a recess for approximately detecting the steam temperature in the pot, and the surface temperature of the recess is measured by the pot lid temperature detector. When the detection signal of the lid temperature detector is input to the control device, the detection signal is compared with a preset temperature pattern in the cooking chamber from the start of rice cooking to the completion of rice cooking, and the control device detects the temperature of the lid lid temperature. A signal for driving the heating power changing means is output so that the detector detection signal matches the temperature pattern in the pot.
[0008]
【Example】
FIG. 1 is a schematic longitudinal sectional view of a continuous rice cooker according to the present invention. Reference numeral 1 denotes a tunnel-shaped rice cooker. A pot carry-in part 2 is at the left end of the rice cooker 1 and a pot carry-out part is at the right end of the rice cooker 1. 3 are formed, and a pair of left and right endless chain conveyors 4 are horizontally installed in the rice cooker 1 as conveying conveyors, for example. The endless chain conveyor 4 is rotatably spanned around a plurality of sprockets 5. The endless chain conveyor 4 is attached so as to suspend both side handles 7 of the rice cooker 6, and the rice cooker 6 transfers the inside of the rice cooker 1. It is configured as possible.
[0009]
The gas burner provided below the rice cooker 6 is composed of a plurality of blocks (16 blocks of 8A to 8P in this embodiment) of gas burner groups 8. The gas burner group 8 is formed by bundling four burner pipes 9, for example. The rice cooker 6 can be cooked with heat. Reference numerals 10A to 10P are gas pipes communicating with the gas burner groups 8A to 8P, respectively, and reference numerals 11A to 11P are interposed in the respective gas pipes 10A to 10P to change the heating power of the gas burner groups 8A to 8P, respectively. It is a possible solenoid valve. The solenoid valves 11A to 11P have a configuration in which the gas supply amount can be changed in three stages.
[0010]
FIG. 2 is an enlarged perspective view of the gas burner group 8 and the rice cooker 6, but the pot lid 6A of the rice cooker 6 has a plate thickness larger than that of the pot lid 6A in order to detect the steam temperature in the pot approximately. A thin recess 6B having good thermal conductivity is formed. And the top temperature detector 12 ... which detects the surface temperature of the said recessed part 6B is provided in the said rice cooking furnace 1 upper part. The pot lid temperature detectors 12 are provided opposite to the recesses 6B, and since there are a plurality of rice cookers 6 transferred by the chain conveyor 4, a non-contact temperature detector is preferable. A thermometer may be used.
[0011]
Next, the control device will be described with reference to FIG. The lid temperature detectors 12 </ b> A to 12 </ b> H are each connected to a microcomputer, and input changes thereof are input to the CPU 15 via the A / D converter 13 and the input interface 14. On the other hand, the microcomputer and the solenoid valves 11A to 11P are respectively “large”, “medium” and “small” via the output interface 16 from the CPU 15 in response to the input signals from the lid temperature detectors 12A to 12P. It is connected so that an opening signal is output. Thereby, each gas burner 8A-8P can select three types of thermal power, "high fire", "medium fire", and "low fire". And the program of the rice cooking process is set so that the uniform rice cooking operation without unevenness may be performed in ROM17 and RAM18.
[0012]
Next, the rice cooking operation | movement in the said structure is demonstrated. If general rice cooking is performed according to the rice cooking pattern of FIG. 4, uniform rice cooking without unevenness becomes possible. If this rice cooking pattern is explained in full detail, the curve A will be the surface temperature of the recessed part 6B detected from the said pot lid temperature detectors 12A-12H, and the curve B will be the steam temperature in the pot detected experimentally. From these two curves, it can be seen that there is a correlation between the surface temperature of the recess 6B and the steam temperature in the pot, and these two curves are stored in advance in the ROM 17 of the microcomputer to adjust the heating power of the gas burners 8A to 8P. To do.
[0013]
That is, when a timer provided in the CPU 15 is started, and the rice cooker 6 is transferred by the chain conveyor 4 to start cooking, in the boiling arrival process A (see FIG. 4) for a certain time (about 10 minutes) from the start of cooking, The signal which becomes a "large" opening degree is output with respect to the solenoid valves 11A-11H, and the rice cooker 6 is heated in a state where the gas burner groups 8A-8H are "high fire". This boils the water in the rice cooker 6 in a short time, causes intense convection in the rice cooker 6, and can achieve uniform heating. At this time, detection signals from the hook lid temperature detectors 12A to 12D are always input to the CPU 15 and monitored so as not to deviate from the curve A in FIG.
[0014]
Next, when the rice cooker 6 moves to the gas burner group 8H and the steam temperature in the kettle reaches T1 (° C.) is detected by the kettle lid temperature detector 12E (the surface temperature of the recess 6B at this time is T2 (° C.)), the CPU 15 outputs a signal indicating a “medium” opening to the solenoid valves 11I to 11L, and heats the rice cooker 6 with the gas burner groups 8I to 8L in a “medium heat” state. This is the boiling maintenance process B (see FIG. 4), and if this state is continued for a certain time (within 10 minutes), the moisture in the rice cooker 6 is reduced, and the rice grains that have been gelatinized and fluidized in the surface layer portion of the rice grains. Fixed. However, during the heating in the boiling maintenance step B, the steam temperature in the kettle is lowered and may become T1 (° C.) or less. Therefore, when the steam temperature in the pot drops below T1 (° C.), the opening degree of the solenoid valves 11I to 11L may be changed to “large” to control the gas burner groups 8I to 8L to the “high fire” state.
[0015]
Further, when the rice cooker 6 moves to the gas burner group 8M, the boiling maintaining process B is followed by the baking process C. At this time, water in the rice cooker 6 has disappeared, and it is detected by the lid temperature detector 12G that the steam temperature in the kettle has risen from T1 to T3 (° C.) (see FIG. 4) (the recess 6B at this time). Is the surface temperature of T4 (° C.). Then, CPU15 outputs the signal which becomes a "small" opening degree to solenoid valve 11M-11P, and heats rice cooker 6 in the state of gas burner groups 8M-8P in a "low heat" state. When the temperature in the kettle reaches from T3 to T5 (° C.) by this baking (at this time, the temperature of the recess 6B is T6 (° C.)), the heating by the gas burner group 8 is finished, and the three-dimensional steaming device ( The rice is cooked through steaming.
[0016]
In the present embodiment, the electromagnetic valve 11 for changing the gas flow rate is mainly described as means for changing the thermal power of the gas burner groups 8. However, the thermal power changing means is not limited to this, and the electromagnetic valve 11. Instead of this, a gas pressure adjusting valve for changing the gas pressure may be used. Further, the recess 6B provided in the pot lid 6A may be provided on the side wall of the rice cooker 6, and the quantity of the pot lid temperature detector 12 may be reduced in order to reduce the manufacturing cost.
[0017]
【The invention's effect】
According to the continuous rice cooker of the present invention, the lid temperature detector for detecting the surface temperature of the recess provided in the lid of the rice cooker, the thermal power changing means for respectively changing the thermal power of the gas burners of the plurality of blocks, The detection signal from the lid temperature detector is compared with the previously set temperature pattern in the pot from the start of rice cooking to the completion of rice cooking, and the detection signal from the pot lid temperature detector matches the temperature pattern in the pot. Therefore, the rice cooker is started by measuring the surface temperature of the recess provided in the pot lid and approximately detecting the steam temperature in the pot. The heating power of each process from cooking to cooking is now accurately performed, and uniform cooking with no unevenness has become possible.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a continuous rice cooker according to the present invention.
FIG. 2 is an enlarged perspective view of a gas burner group and a rice cooker.
FIG. 3 is a block diagram showing a control device for a continuous rice cooker according to the present invention.
FIG. 4 is an explanatory view showing a rice cooking pattern applied to the continuous rice cooker of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rice cooking furnace 2 Pot carry-in part 3 Pot carry-out part 4 Chain conveyor 5 Sprocket 6 Rice cooker 6A Pot lid 6B Recess 7 Handle 8 Gas burner group 9 Burner pipe 10 Gas pipe 11 Electromagnetic valve 12 Pot lid temperature detector 13 A / D converter 14 Input interface 15 CPU
16 Output interface 17 ROM
18 RAM

Claims (1)

In the continuous rice cooker that transfers the rice cooker by an endless conveyor provided in the rice cooker and heats the rice cooker with a plurality of blocks of gas burners installed below the conveyor to cook rice,
A pot lid temperature detector for detecting the surface temperature of the recess provided in the pot lid of the rice cooker;
Thermal power changing means for changing the thermal power of the gas burner group of the plurality of blocks,
The detection signal from the pot lid temperature detector is compared with the preset pot temperature pattern from the start of rice cooking to the completion of rice cooking, and the detection signal from the pot lid temperature detector is converted into the pot temperature pattern. A control device for controlling each of the plurality of heating power changing means to match,
The thermal power control apparatus in the continuous rice cooker characterized by providing.

Images