JPH0479646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a fryer for frying cooking materials, and more particularly to a solid oil heating device used in the fryer.

(b) Prior art Regarding a fryer in which an oil tank equipped with a heating element is filled with oil to fry cooking materials, for example,
The electric fryer disclosed in No. 148322 is equipped with a thermostat that is turned on and off by heat from a heating cylinder that is placed near the heating element and detects the heating temperature, and the oil temperature of the fryer is determined by turning on and off the thermostat. The temperature is maintained at a substantially constant temperature by energizing and de-energizing the heating body. However, when starting cooking, when solid oil is placed in an oil tank and heated with a heating element to melt it, a space is formed between the solid oil and the heating element, so some portions of the solid oil may be partially melted. In addition, the heating element does not exchange heat with the solid oil and reaches a high temperature, and further heating causes damage to the heating element. Furthermore, when the oil comes into contact with the heating element at a high temperature, the high temperature oxidizes the oil and accelerates the deterioration of the oil.

Furthermore, when the oil used for cooking cools down in the oil tank, as in fryer F shown in FIG. 2, the cooled and solidified oil 1, oil tank 2, heating elements 3, 3, etc.
A plurality of spaces 4, 4... are formed between the oil 1
When melting the oil, the heating element 3 is damaged and the oil 1 deteriorates.

(C) Purpose of the Invention The present invention solves the problem that when melting solidified oil contained in the oil tank of a fryer, the heating element becomes dry and is damaged, and that the oil comes into contact with the high-temperature heating element and the oil is melted. The purpose is to prevent the food from deteriorating and to shorten the preparation time until the start of cooking.

(D) Structure of the Invention The present invention is a fryer that heats oil with a heating element disposed in an oil tank, and a signal that causes the heating element to generate heat intermittently when melting solid oil is used to control the operation of the heating element. a timer circuit that outputs an output to the circuit; and a forced heating circuit that includes a forced heating switch and outputs a signal to the operation control circuit that causes the heating element to continuously generate heat regardless of the output from the timer circuit by the operation of the switch. This is a solid oil heating device for a fryer equipped with a heating element, and when solid oil in an oil tank is heated by a heating element to liquefy, heating by the heating element is performed intermittently, and the solid oil in the heating element is not in contact with the heating element. This prevents the parts from becoming hot and damaged due to heat generation, prevents the oil from coming into contact with the high temperature parts of the heating element and deteriorating the oil, and further reduces the preparation time until the start of cooking due to the operation of the forced heating circuit. can be shortened.

(E) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Fig. 1 is a schematic circuit diagram of a solid oil heating device for a fryer, and Fig. 2 is a fryer consisting of a metal oil tank 2 and a heating body 3, such as a meandering heating tube provided with a heater, installed at the bottom of the oil tank. First, the schematic circuit diagram shown in FIG. 1 will be described with reference to the vertical cross-sectional view of F.

5 is a forced heating circuit, which consists of a series circuit of a first resistor 7 whose one end is connected to a power supply line 6 and a forced heating switch 8 that is turned on when forcibly heating oil; the midpoint of this series circuit is One side of the first OR circuit 10 is connected to the inverter circuit 9 which outputs a low level signal (hereinafter referred to as L signal) when a high level signal (hereinafter referred to as H signal) is input, and outputs an H signal when an L signal is input. is connected to the input terminal of

Reference numeral 11 denotes a heating element operation control circuit including a first OR circuit 10 , and the output terminal of the first OR circuit 10 is connected to the base of an NPN type transistor 13 via a second resistor 12 . In addition, 14 is the third resistor, 1
5 is a diode, and 16a is an excitation winding of the relay device 16. The excitation winding 16a is energized when the transistor 13 is on, and de-energized when it is off. Also, 17
1 is a heating element energization circuit, which is composed of a series circuit of a relay switch 16s of a relay device 16 connected between power lines, a heating element 3, and a thermoswitch 18 for preventing excessive oil rise, and the relay switch 16s is connected to an excitation winding. It is turned on when the wire 16a is energized and turned off when it is not energized.

20 is a timer circuit, first and second counter circuits 21, 22, dual type. Flip. Flop (hereinafter referred to as DF/F) 23, oscillation circuit 24,
It consists of a second OR circuit 25 and an initial reset circuit 26, which are connected as shown in FIG. The initial reset circuit 26 is composed of a charging circuit consisting of a fourth resistor 27 and a capacitor 28, and a diode 29.

The operation of the solid oil heating device will be explained below.

As shown in Fig. 2, the oil in the oil tank 2 cools and solidifies, forming a plurality of spaces 4, 4..., and when the forced heating switch 8 is turned off, when the power is turned on to melt the solid oil. , the initial reset circuit 26 outputs the charging time L signal determined by the fourth resistor 27 and the capacitor 28 to one input terminal of the second OR circuit 25, and the output terminal _Q2 of the second counter circuit 22 outputs the L signal. is output to the other input terminal of the second OR circuit 25, and the second OR circuit 25 outputs DF/
An L signal is output to the reset terminal R of F23. Then, the first output terminal of the DF/F 23 outputs an H signal to the reset terminal R of the first counter circuit 21, and the second output terminal Q outputs an H signal to the reset terminal R of the first counter circuit 21.
Output the L signal to the reset terminal R of 2, and DF/F
23, the first counter circuit 21 counts the reference clock from the oscillation circuit 24, and after a certain count, that is, after a certain period of time, for example, 3 seconds, the output terminal _Q1 outputs an H signal. During this time, the second counter circuit 22 is in a stopped state, and the DF/
The output of the first output terminal of F23 is the first OR circuit 1
0 to the other input terminal of the first OR circuit 1
0 outputs an H signal to the base of the transistor 13 via the second resistor 12, the transistor 13 is turned on, the excitation winding 16a is energized, and the relay switch 16 is turned on.
s is turned on, the heating element 3 is energized, generates heat, and gradually melts the solid oil.

When the first counter circuit 21 outputs an H signal
The DF/F 23 inputs the H signal as a clock, inverts the output, outputs an L signal from the first output terminal, and outputs an H signal from the second output terminal Q. Then, the reset terminal R of the first counter circuit 21 receives an L signal, and the first counter circuit 21
stops operation and outputs an L signal. Also, DF/
An L signal is applied from the first output terminal of F23 to the other input terminal of the first OR circuit 10, and both input terminals of the first OR circuit 10 input the L signal and output the L signal, and the transistor 13 is turned off. Excitation winding 1
6a is de-energized, the relay switch 16s is turned off, and the heating element 3 is de-energized and heat generation stops. Furthermore, the second output terminal Q of the DF/F 23 outputs an H signal to the set terminal R of the second counter circuit 22, and the second counter circuit 22 counts the clock from the oscillation circuit 24, and after a certain count, for example,
After 12 seconds, output terminal _Q2 outputs an H signal.

When the second counter circuit 22 outputs an H signal,
An H signal is input to the reset terminal R of the DF/F 23 via the second OR circuit 25, and the first output terminal is set to H.
The signal is sent to the first counter circuit 21 and the first OR circuit 1.
0 to the other input terminal, and the second output terminal Q outputs an L signal to the second counter circuit 22. Then, similar to the above operation, the first counter circuit 21 starts counting, the excitation winding 16a is energized, the heating element 3 is energized and starts generating heat, and the solid oil that has not yet melted due to the previous heating melts. At the same time, the oil temperature gradually rises. When the first counter circuit 21 counts up after a predetermined period of time has elapsed, the first counter circuit 21 again outputs the H signal to the clock terminal C of the DF/F 23, and the DF/F 23 again inputs this H signal as a clock. DF／
F23 is inverted, the first output terminal outputs an L signal, and the second output terminal Q outputs an H signal, and the excitation winding 16a is de-energized in the same manner as in the above operation, and the heating body 3 generates no heat. Stop. Further, an H signal is given to the second counter circuit 22, the second counter circuit 22 starts counting, and when a predetermined period of time has elapsed, the output terminal _Q2 of the second counter circuit 22 outputs an H signal and the DF/F 23 H to reset terminal R
A signal is given.

When the H signal is applied to the reset terminal R of the DF/F23, the DF/F23 is inverted again and the first output terminal outputs the H signal, and the second output terminal Q outputs the L signal, and the second output terminal Q outputs the L signal. 1 counter circuit 2
1 count is started, and the excitation winding 16
A is energized and the heating element 3 resumes generating heat. The remaining solid oil is melted by the heat generated by the heating element 3.
When the above operation is repeated and all the solid oil has melted over time, when the forced heating switch 8 is turned on, the inverter circuit 9 inputs an L signal and outputs an H signal, and one side of the first OR circuit 10 is turned on. The input terminal of inputs an H signal, and the first OR circuit 10 outputs an H signal regardless of the output from the first output terminal of the DF/F 23. The transistor 13 is turned on by the H signal output from the first OR circuit 10, the excitation winding 16a is energized, and the oil temperature gradually rises due to the heat generated by the heating element 3.

Also, when the solid oil in the fryer is heated and melted at predetermined intervals by the operation of the timer circuit 20, for example, if the user of the fryer melts most of the solid oil and heats the oil continuously, the oil will not melt. When it is judged that no deterioration will occur or when you want to melt the solid oil quickly and start cooking as soon as possible, turn on the forced heating switch 8, and the H signal is sent to the first OR circuit 10 via the inverter circuit 9. The transistor 13 is turned on by the H signal output from the first OR circuit 10, and the oil is continuously heated by the heat generated by the heating element 3 regardless of the signal from the timer circuit 20. In addition, the oil temperature rises and becomes high temperature (for example,
Thermo switch 1 to prevent oil from rising too high when the temperature reaches 200℃
8 detects the temperature and turns off, cutting off electricity to the heating element 3 and preventing the oil temperature from rising excessively.

Therefore, when the oil in the oil tank is cold and solidified, or when new solidified oil is put into the oil tank and heated, the first counter circuit 21, second counter circuit 22, and DF/F
23 causes the heating element 3 to generate heat at predetermined time intervals, so even if the hollow portion of solid oil is located on the surface of the heating element 3, the heating element 3 During operation, no heat is generated and the temperature drops and does not reach a high temperature, making it possible to prevent damage to the heating element 3 due to high temperature conditions. In addition, it is possible to reliably prevent the melted oil from coming into contact with the heating element 3, which is in a high temperature state due to the existence of a solid oil cavity around it, and from instantaneously vaporizing or becoming high temperature and deteriorating. It can be melted and heated in good conditions for cooking.

Also, when the user notices that the oil has liquefied before the temperature of the oil reaches the set temperature while heating the oil, the user operates the forced heating circuit 5 to continuously heat the oil. , it is possible to heat the oil continuously to bring the oil to a cooking temperature in a short time, shorten the preparation time before starting cooking, and start cooking in a short time from the time the oil starts heating. can. Note that the present invention is not limited to the timer circuit and forced heating circuit shown in the embodiments.

(F) Effects of the Invention The present invention provides a fryer in which oil is heated by a heating element disposed in an oil tank, in which a signal that causes the heating element to generate heat intermittently when melting solid oil is used to control the operation of the heating element. a timer circuit that outputs an output to the circuit, and a forced heating circuit that includes a forced heating switch and outputs a signal to the operation control circuit that causes the heating element to continuously generate heat regardless of the output from the timer circuit by the operation of the switch. Since this is a solid oil heating device for a fryer equipped with This can be done at predetermined intervals to prevent parts of the heating element that are not in contact with the solid oil from becoming heated and damaged due to heat generation, and to prevent deterioration due to contact of molten oil with the heated heating element. Not only can the oil be melted and heated in a good condition for cooking, but it can also be used when the user wants to start cooking as soon as possible or when the user can confirm that the oil has liquefied. When this happens, the forced heating circuit is activated to continuously heat the oil, and cooking can be started in a short time from the start of heating the oil.

[Brief explanation of drawings]

FIG. 1 is a schematic circuit diagram of a solid oil heating device for a fryer shown as an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the fryer. 1... Oil, 2... Oil tank, 3... Heating element, F...
Fryer, 5... Forced heating circuit, 8... Forced heating switch, 11... Heating element operation control circuit, 20
...Timer circuit.

Claims (1)

[Claims] 1. In a fryer that heats oil with a heating element disposed in an oil tank, a timer circuit that outputs a signal that causes the heating element to generate heat intermittently when melting solid oil to an operation control circuit of the heating element; A fryer comprising a forced heating switch, and a forced heating circuit that outputs a signal to the operation control circuit to cause the heating element to continuously generate heat regardless of the output from the timer circuit by the operation of the switch. solid oil heating device.