JPS6052B2 - flyer - Google Patents

Description

[Detailed description of the invention] The present invention relates to fliers.

Recently, fliers combined with microwave heating have been proposed.

Generally, the transfer loss of food is sufficiently larger than the dielectric loss of oil, and most of the microwaves are absorbed by the food, so in this case, the outside of the food is heated by the oil, and the inside is heated by the microwave. , thus reducing frying time.
In such a fryer, ``To prevent microwave leakage, the food entry/exit section, which is open in conventional fryers without microwave heating function, must be closed with a door, but at this time, the door must be closed. There is a drawback that it is difficult to judge whether the oil amount is appropriate or not.The present invention was made in view of this point, and it is an object of the present invention to provide a flier that can judge whether the oil amount is appropriate or not with the door open. Figure 1 shows temperature changes near the oil surface when oil is heated, measured at various oil temperatures.

In addition, in this graph, the temperature is measured on the axis of the machine, and the measurement position is on the longitudinal track, and the measurement position is in the oil in the negative direction with the oil level as the reference.As is clear from this graph, The temperature at the top of the oil surface, which is more than a rib away, and the temperature in the oil are 1o.
There is a difference of more than o○.

The present invention was made based on this knowledge, and its features include a first temperature-measuring thermistor that sinks into the oil only when the amount of oil in the oil tank is appropriate; A second temperature-measuring thermistor installed in the layer is provided, and an insufficient amount of oil is detected based on the difference in temperature detected by the first and second temperature-measuring thermistors.

The invention will now be explained with reference to examples. 2A and 2B show an embodiment of the present invention, in which 1 is an oil tank, 2 is a heater installed on the bottom of the oil tank, and 4 and 5 are heaters for heating the oil 3 placed in the oil tank; The first temperature thermistor is installed at a position submerged in the oil 3 only when the oil amount is appropriate, and the second temperature thermistor 5 is the first temperature thermistor that measures the temperature of the first temperature thermistor. It is installed at a lower level than the temperature measuring thermistor 4.

Reference numeral 6 indicates an entrance/exit portion for the foods 7, 7, etc. provided on the side wall of the oil tank 1, 8 is a door for opening/closing the entry/exit portion, and 9 is an entry/exit portion for the foods 7, 7, etc.
The basket 9 is immersed in the oil 3 when cooking, and is lifted out of the oil 3 when not cooking, by a driving means (not shown).

101 is a magnetron that supplies microwaves to the oil tank 1.

FIG. 3 is a block diagram showing the electric circuit of the above device.
Reference numeral 12 denotes a well-known D, for example, a ladder circuit, which converts a digital signal as a reference temperature signal outputted from the control section through eight connecting wires 3, 3, . . . into an analog signal.
/A (digital/analog) conversion circuit. The digital signal output from the control section 12 is an 8-bit 2
It is expressed as a value signal, and the binary signal of each bit is output in one-to-one correspondence with the connection lines 13, 13, . . . . Moreover, the above 8-bit digital signal is “0000000
It changes from P to "1111111r, and each signal that is cut corresponds to the temperature value when converted to the number of 15 ships.
In other words, the "00000000" signal is 0°C. 〇. 〇. 〇.・"is 100,". . . . . . 10,, is 2℃?
“11111111” corresponds to 255°C.

14 and turtle 5 are first and second comparison circuits that compare the reference temperature signal from the ○/A conversion circuit 12 and the temperature signals from the first and second temperature measuring thermistors 4 and 5, respectively.
~The second comparison circuit both determines whether the temperature signal from each thermistor 4, 5 is larger than the reference signal output from the D/A conversion circuit blade 2, and outputs the result to the control section 11.

The control unit li also controls the ON/OFF control of the magnetron 10, heater 2, and notification means 16, such as a buzzer, which notifies when the oil amount is insufficient.

Such a device detects the first and second detection thermistors 4 at predetermined intervals.
9. The control unit 11 determines whether the temperature difference between the temperatures T, T2 measured from 5 is equal to or higher than a predetermined temperature, and when the predetermined temperature difference is measured several times in succession, the alarm means detects a lack of weight loss. This is to inform.

Here, in this embodiment, the predetermined time and the predetermined temperature difference are each set to 1.
seconds, 1oo0, and is configured to notify when such a temperature difference is measured four times in a row. The reason why the number of consecutive measurements of the temperature difference is set to four is to correct for erroneous measurements caused by such undulations, as the oil surface may be undulated. A flowchart of an oil amount detection program stored in a ROM is shown.

This program consists of a temperature measuring section A consisting of 9 steps S, ~S, and an oil amount detecting section A consisting of 4 steps S, o~S.
It consists of 2. First, the operation of the temperature detection section A will be explained.

When cooking starts, the heater 2 and magnetron 10 are turned on in step S, and the contents of the oil surface temperature range, oil temperature range, reference temperature range, and CNT provided in the RAM of the control unit 11 are all set. It is cleared to d'0''.

Here, the temperatures T, L measured by the first and second temperature measuring thermistors 4 and 5 are finally stored in each of the oil surface temperature region and the oil temperature region. Further, the reference temperature region is an 8-bit region that stores a digital signal as a reference temperature signal output from the control section 11 described above. Nao C
NT will be described later. The reference signal within the reference temperature range is outputted to the D/A conversion circuit 12 in step S2 and converted into an analog signal, and then the signal is outputted to the first and second comparison circuits 14 and 15, respectively. Ru.

Next, in step S3, a first temperature comparison is performed.

Specifically, the temperature T obtained from the second temperature measurement thermistor 5
The second comparison circuit 15 compares the temperature signal corresponding to the second comparison circuit 15 with the reference signal input from the D/A conversion circuit 12. In such a comparison, if the temperature T2 measured by the second temperature-detecting thermistor 5 is higher, the contents of the oil temperature range are incremented by 1 in step LS4, and the process proceeds to step S5. In step S5, a second temperature comparison is performed.

That is, the first comparison circuit 14 compares the temperature signal corresponding to the temperature T obtained from the first temperature measurement thermistor 4 and the reference signal input from the D/A conversion circuit 12 . In such a comparison, if the temperature T measured by the first temperature detection thermistor 4 is larger, the contents of the oil surface temperature region are changed to 1 in step S6.
Increase S? Proceed to step. Further, if the reference signal output from the D/A conversion circuit 12 is larger than the reference signal in the comparison in step S5, the process proceeds to step S7.

In step S7, the contents of the reference temperature range are incremented by one.

In other words, the new operation increases the temperature corresponding to the signal output from the D/A converter 12 by 1°C. Then S8
Proceed to step. Further, in the comparison in step S3, if the temperature signal from the second temperature thermistor 5 is smaller than the reference signal from the D/A converter 12, the process proceeds to step S9.

In step S9, as in step S5, the reference signal from the D/A conversion circuit 12 and the temperature signal from the first temperature measurement thermistor 4 are compared, and if the reference signal from the D/A conversion circuit 12 is large, If the temperature signal from the first temperature thermistor 4 is large, the process advances to step S8.
The process proceeds to step S8 via step 7. In step S8, it is determined whether one second has elapsed.

This determination is to prevent the oil amount detection unit A2 from operating based on the temperature (oil surface temperature area and contents of the oil temperature area) measured by the temperature measurement unit A every second from the start of cooking. . In the temperature measurement section A, if the temperatures T, , T2 measured by the first and second temperature thermistors 4, 5 are both higher than the reference temperature corresponding to the content of the reference temperature range, S2, S3 , S4, S5, S6, S7, and S8. At this time S4, S5
, S7, the contents of the oil temperature, oil surface temperature, and reference temperature range are incremented by 1, respectively. However, in the first loop, the reference temperature corresponding to the contents of the reference temperature range increases by 1°C for each loop, and only the temperature T measured by the first temperature-detecting thermistor 4 is 4 degrees higher than the reference temperature.
・Then, the program is S2, S3, S4, S5, S
7, a second loop consisting of S8 steps is circulated.

Further, if only the temperature T2 measured by the second temperature measurement thermistor 5 is smaller than the above reference temperature, the program will change to S2, S3, S
A third loop consisting of steps 9, S6, S7, and S8 is cycled.

Furthermore, the temperature T measured by the first and second temperature measuring thermistors 4 and 5 is
, , T2 are both smaller than the reference temperature, the program cycles through a fourth loop consisting of steps S2, S3, S9, and S8.

At this time, in step S, the oil surface temperature area, oil temperature area, and reference temperature area are all cleared to ``0'', and the contents of the reference temperature area are 1$ When converted to a number, the temperature value is as described above. In addition, the oil temperature in oil tank 1 is normally 0.
℃ or higher.

Furthermore, the content of the reference temperature range is set to “00” in the temperature measuring section A.
00000 to "11n1llll" and 25 from 0℃ to 255:00 based on such contents.
One second is sufficient for comparing the six reference signals and the measured temperature signals from the first and second temperature measuring thermistors 4 and 5, respectively.

Therefore, when the loop consisting of steps S2 to S9 is executed for one second, the oil surface temperature region and the oil temperature region are filled with the temperatures T, T, and T measured from the first and second detection thermistors 4 and 5, respectively.
, T2 are stored.

Every time the loop operation in the temperature measuring section A is executed for 1 second, the program starts from step S8.
,.

Proceed to step. The operation of the oil amount detection section A2 will be explained below.

S. In step, a third temperature comparison is performed. In other words,
From the content of the oil temperature range (L) to the content of the oil surface temperature range (T,
) to determine whether the difference is 1000 or more. In this judgment, if L is higher than T, by 1oo○ or more, it is determined that the oil amount in the oil tank 1 is below the appropriate amount, and S, . ,S
, proceed to step 2.

S... In step S, the contents of CNT are incremented by 1 and the process proceeds to step S2.

Note that the above CNT is an area for storing the number of times L has become higher than T by 1000 or more. In step S,2, it is determined whether the content of CNT is 4 or not.

Such a determination is made when the temperature difference between T2 and T is 10°C or more (T2>
It is checked whether or not T, ) has occurred four times in a row, and when it has occurred four times in a row, the abnormality notification means 16 notifies the oil amount shortage as described above.If not, then S, proceed to step 4. S again.

If it is determined that the temperature difference between T and T2 is 10 qo or less in step S,3, proceed to step S,3.
In the step, the contents of CNT are cleared to "0", and S,4
Proceed to step. S. In the 4th step, the oil surface temperature region,
Clear the contents of the oil temperature range and reference temperature range to "0" and return to step S2. Compare every second.

At this time, if the temperature measured by the first temperature-detecting thermistor 4 becomes 100 or more lower four times in a row, an abnormality notification is performed to notify that the oil amount is insufficient. Also, with this operation, cooking is stopped. Therefore, in the device of this embodiment, when the oil amount decreases and becomes below the appropriate amount, the temperature measured by the first temperature-detecting thermistor 4 will be 1000 or more lower than the temperature measured by the second temperature-detecting thermistor 5. The amount is several yanagi below the first temperature thermistor 4).

If such a state continues for at least 4 seconds or more, the value of CNT becomes "4" in the oil amount detection section A2, and an abnormality notification of insufficient oil amount is made. Also, since an abnormality notification is not made until the CNT value reaches "4", the oil level will ripple and the first temperature thermistor 4 will momentarily come out of the oil, causing the measured temperature to drop even though there is an appropriate amount of oil. Even if this happens, no malfunction will occur because no abnormality notification will be made. Further, oil temperature setting in such a device is carried out by turning on and off the heater 2 and magnetron 10 based on the measured value from the second detection thermistor 5.

In the above device, it is possible to use only the first temperature-detecting thermistor 4 and detect the amount of oil by checking the degree of rise and fall of the detected temperature, but if the oil level is near the thermistor, Heat dissipation must also be taken into consideration, making control very difficult. Furthermore, there is no way to set the oil temperature when the oil level is below the appropriate level, that is, when the thermistor is outside the oil. There is a danger that the oil temperature may exceed the desired temperature.

Furthermore, the oil amount is detected only when the oil amount is appropriate using a thermistor placed so as to be submerged in the oil, and if the oil amount falls below the appropriate amount using any method, the oil amount will be detected as described above. The danger of soot rising above the desired temperature cannot be avoided.

As is clear from the above description, the fryer of the present invention includes a first temperature-measuring thermistor that sinks into the oil only when the oil amount is appropriate, and a second temperature-measuring thermistor that is installed directly below the first temperature-measuring thermistor. Since the lack of oil quantity is detected based on the difference in temperature detected by both thermistors, it is easy to control oil quantity detection even when the oil level is near the first temperature-detecting thermistor, and the oil temperature can be controlled easily. Detection can be performed using the second thermometer that is always in the oil, so the oil temperature never exceeds the desired temperature.

Further, when the temperatures detected by both thermistors have a predetermined difference several times in succession, it is determined that the oil amount is insufficient, thereby preventing detection errors due to undulation of the oil surface.

[Brief explanation of drawings]

Fig. 1 is a graph showing temperature changes near the oil surface, Figs. 2 to 4 show embodiments of the present invention, Figs. The figure is a flowchart. 1...Oil tank, 3...Oil, 4...First temperature thermistor, 5...Second temperature thermistor. Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1. An oil tank, a first temperature-measuring thermistor that sinks into the oil only when the amount of oil in the oil tank is appropriate, and a second temperature-measuring thermistor installed at a lower position than the first temperature-measuring thermistor in the oil tank. A fryer comprising a thermistor and comprising a detecting means for detecting a lack of oil amount based on a predetermined difference between the temperatures detected by the first and second temperature measuring thermistors, and a notification means for notifying a lack of oil amount based on the detection output of the detecting means. . 2. In claim 1, the detection means is:
A flyer characterized in that a detection output is generated when the predetermined difference is detected a plurality of times in succession.