JPH0631Y2 - Egg boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an egg boiler that can easily make hot spring eggs and boiled eggs in ordinary households without failure.

(Prior art) Conventionally, as an egg boiler that can boil hot spring eggs,
It has been proposed that the water and eggs in the container are heated by a heater, the temperature is adjusted by a thermostat, etc., and the time is set by a timer provided separately.

(Problems to be solved by the invention) However, in the egg boiler, since the thermostat is easily affected by the outside air, the boiling time varies depending on the season. There was a problem in that the quality of work could vary depending on time. Therefore, skill is required to always boil the rice uniformly.

Therefore, the present invention does not require time setting, regardless of the number of hot spring eggs and boiled eggs, and without requiring skill,
The technical task is to be able to boil without failure.

(Means for Solving the Problems) As means for achieving the above-mentioned object, the present invention provides a heating container equipped with a heater, an egg stand for accommodating eggs stored in the heating container, and an outside for insulating the heating container. A container and a control device for controlling the heater on / off, the control device being in close contact with the bottom of the heating container and being arranged so as to be shielded from the outside air, and a temperature sensor in the heating container. Reference temperature setting means for setting the upper and lower reference temperatures of the water temperature and the reference temperature from the temperature sensor and the reference temperature setting means are compared, and when the detected temperature reaches the upper reference temperature, the heater A signal for turning off the heater and a signal for turning on the heater when the lower limit reference temperature is reached, and a heater drive for turning on / off the heater circuit by the output signal from the comparing means. The present invention provides an egg boiler characterized by comprising a moving circuit.

In the embodiment, the heating container is formed with a protrusion projecting inward substantially at the center of the bottom thereof, and the temperature sensor is disposed in the protrusion and in the remaining space of the protrusion. It is shielded from outside air by the heat insulating material.

In another embodiment, a counter that counts the output signal from the comparing means and outputs when the second off signal is output, and an alarm device that issues an alarm upon receiving the output signal of the counter are provided. To be done. In another preferred embodiment, heater stopping means for turning off the heater driving circuit by the output signal of the counter is provided.

(Operation) In the egg boiler according to the present invention, the temperature sensor is arranged in close contact with the bottom of the heating container and shielded from the outside air.
By making the heating container heat insulating, it is possible to accurately detect the water temperature regardless of the outside air temperature and the number of eggs.
By setting the upper and lower temperature limits for heating according to the type of hot spring egg or boiled egg and turning the heater on and off accordingly, it is possible to make stable hot spring eggs and boiled eggs without the need for time setting. ing.

Hereinafter, embodiments of an egg boiler according to the present invention will be described with reference to the accompanying drawings.

(Example) In FIG. 1, 1 is an outer container, 2 is a lid, 3 is a heating container, 4 is an egg mounting table, 5 is a temperature sensor, 6 and 7 are heat insulating materials, and the heating container 3 is below the side wall thereof. The heater 8 is attached to the outer container 1 and the side wall is surrounded by the heat insulating material 7 and housed in the outer container 1. The heating container 3 is formed of a metal material having a good thermal conductivity such as aluminum, and has a cylindrical protruding portion 9 that protrudes into the inside of the heating container 3 at approximately the center of its bottom.
Is formed, the temperature sensor 5 is disposed in close contact with the top portion 9a of the protruding portion 9, and the lower portion thereof is insulated with a heat insulating material 6 in order to improve the accuracy of temperature detection due to the influence of the outside air.
The height of the protrusion 9 can be set to some extent,
It is preferable to set the temperature sensor 5 so as to be located at a level substantially equal to the center of the egg 10 when the egg table 4 on which the egg 10 is placed is placed in the heating container 3.

The egg table 4 has a shape substantially similar to the shape of the heating container 3 and forms a predetermined space between the egg container 4 and the inner wall surface of the heating container 3, and thus is formed to be slightly smaller than the inner diameter of the heating container 3. A leg 11 is provided on the bottom of the egg stand 4, and the height of the outer peripheral wall of the egg placing table 4 is set to be higher than the water surface when the egg 10 is placed. In addition, the egg table 4 is formed with an appropriate hole 12 for placing an egg on the bottom thereof. On the other hand, in order to make the temperature distribution of the hot and cold water in the egg table 4 uniform, the lower part of the outer peripheral wall of the egg table 4 and the heating container 3 are provided. At the top of the protruding portion 13 provided corresponding to the protruding portion 9 of the
4, 15 are formed respectively. In addition, the hole 12 functions as a flow path of hot water when the egg 10 is not placed.

The temperature sensor 5 is composed of, for example, a thermistor, and is connected to a heater control device 16 arranged at an appropriate position in the outer container 1. This heater control device 16
As shown in FIG. 2, the comparison means 17, the heater drive circuit 18 for turning on / off the heater circuit according to the output signal from the comparison means 17, and the reference temperature for boiling hot spring eggs or boiled eggs are set. The reference temperature setting means 19 and the notification means 20 are provided for notifying the user of the boiling.
Is attached. In the figure, R _n is a resistor, C _n is a capacitor, Q is a transistor, OP _n is an operational amplifier, and FF _n is a flip-flop.

The comparison means 17 is composed of a Schmitt trigger circuit, and compares the detected temperature detected by the temperature sensor 5 with the reference temperature set by the reference temperature setting means 19,
When the detected temperature is lower than the second reference temperature, a signal for turning on the heater drive circuit 18 is output, and when the detected temperature is higher than the first reference temperature, a signal for turning off the heater drive circuit 18 is output.

In addition, since the heating temperature and time are different between the hot spring egg and the boiled egg, the switch S can be selected so that the heating temperature suitable for the egg dish to be cooked, that is, the hot spring egg or the boiled egg can be selected.
By switching W, the resistance connected in series to the temperature sensor 5 can be switched between R ₁ and R ₂ . These resistances R ₁ and R ₂ are required to maintain the temperature of the eggs at 65 to 70 ° C. for making hot spring eggs, and 80 ° C. or more for boiling eggs, so the reference temperature setting circuit Are set according to the reference temperatures T ₁ and T ₂ (actually, the reference voltages V _u and V ₁ for turning the heater driving circuit off or on) which are determined by the resistors R _{4 to} R ₇ . In the case of a hot spring egg, the reference temperature T ₁ for turning off the heater 8 is slightly lower than the upper limit temperature Tmax 70 ° C. during heating, and the reference temperature T ₂ for turning on the heater 8 is set higher than the minimum temperature Tmin 65 ° C. Preferably. This is because there is a delay in the response between the on / off of the heater 8 and the change in the water temperature. Even in the case of hot spring eggs, the maximum temperature Tmax is 7
Even if it slightly exceeds 0 ℃, it will not cause any problems for a short time.
There is no particular problem even if the minimum temperature Tmin becomes lower than 65 ° C.

Further, in the case of hot spring eggs, it is necessary to maintain the temperature range for 20 to 25 minutes, and in the case of boiled eggs, it is necessary to maintain the temperature range for 11 minutes or more.
In consideration of the heat insulating property, the heat insulating material 7 holds the heat insulating material. In the case of boiled eggs that are half-boiled, heating at a temperature of 80 ° C. or higher for about 8 minutes is sufficient. Just adjust it. In this case, it is preferable that the heating container 3 or the egg table 4 be provided with a water amount scale for semi-ripening.

The notification means 20 is composed of a down counter and a buzzer drive circuit, and every time the heater 8 is turned off, the signal from the comparison circuit enters the flip-flop FF ₁ as a clock,
The buzzer 21 is sounded by the output from the flip-flop FF ₂ when it is turned off for the second time.

When making a hot spring egg using the egg boiler with the above configuration, first,
A predetermined amount of water is put into the heating container 3, and a required number of eggs is placed on the egg stand 4. Next, when the switch SW is adjusted to the hot spring egg, the temperature of the temperature sensor 5 is lower than the reference temperature T ₁ because the water temperature is low, so that the output level of the comparison circuit 17 becomes low level, so that the transistor Q is turned on. Turn it on
The heater circuit is closed by exciting the relay Ry, and the heater 8 heats the heating container 3. Along with this, the heating container 3
Water heated through the side walls of the
Although trying to move further toward the center side, the side wall 4 of the egg stand 4
Since it is blocked by a, it flows downward along the side wall 4a, and convection occurs in the space formed between the heating container 3 and the side wall of the egg placing table 4. At the same time, the heated water flows into the egg placing table 4 through the hole provided in the lower side wall of the egg placing table 4 and the hole 15 provided in the bottom wall, so that the water in the egg placing table 4 is heated from below. As a result, the uniformity of the temperature distribution in the egg table 4 is guaranteed.

When the water temperature in the heating container 3 rises, the temperature T detected by the temperature sensor 5 follows the temperature rise as shown by the temperature curve in FIG. 3, but when the temperature T reaches the reference temperature T _1. (A in FIG. 13), the output level of the comparison circuit 17 is inverted and the heater drive circuit 18 is turned off, so that the power supply to the heater 8 is stopped. Even after the power supply to the heater 8 is stopped, the temperature detected by the temperature sensor 5 slightly rises due to the heat accumulated in the heating container 3 and the heater 8 (FIG. 2B), but when it reaches a certain maximum temperature (FIG. 3C), Lid 2, heat insulating material 7 and outer container 1
Due to the heat radiation through, the temperature of the hot water in the heating container 3, and
The temperature detected by the temperature sensor 5 gradually decreases (Fig. 2D).

Next, the temperature detected by the temperature sensor 5 is the second reference temperature T.
_When it decreases to ₂ (FIG. 3E), the output level of the comparison circuit 17 is reversed again, and the relay Ry of the heater drive circuit 18 is turned on, so that the power supply to the heater 8 is restarted. The water temperature rises again due to the start of energization to the heater 8 (3rd
(To the figure), the temperature T detected by the temperature sensor 5 is the maximum temperature T ₁
(Fig. 9), the power supply to the heater 8 is stopped again, and at this point the cooking of the hot spring egg is completed, and the buzzer 21 of the alarm device sounds in response to the output of the comparison circuit and alerts the user. Emit. When the switch SW is switched to stop here, the flip-flops FF ₁ and FF ₂ are reset and the buzzer 2
1 also stops.

In the case of a boiled egg, cooking is automatically performed by a similar operation simply by switching the switch SW to the boiled egg side. In the case of boiled eggs that are half-boiled, the amount of water may be set to a predetermined amount that is slightly smaller than that when fully boiled.

In the above embodiment, the time to cook a hot spring eggs, although the water temperature is determined by the time H to initially reaches the reference temperature T ₁ of a second time after reaching the reference temperatures T _1, necessarily second time reference It does not have to be the time until the temperature T ₁ is reached, and depending on the heat capacity of the heating container 3 and the water therein, the egg, the egg placing table 4, and the heat retaining performance of the heating container 3, the third or fourth time is required. It may be time to reach the reference temperature T ₁ .

Further, in the above-mentioned embodiment, the case where the control device uses the operational amplifier, the transistor, and the digital IC has been described for the sake of convenience, but it goes without saying that the control device can be configured using a microcomputer.

(Effect of the Invention) As described above, according to the present invention, since time setting is not required, hot spring eggs and boiled eggs can be easily produced without requiring skill. In addition, since the container is provided with heat insulating properties, the boiling condition can be accurately detected regardless of the outside air temperature and the number of eggs, and stable hot spring eggs or boiled eggs can be produced.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of an egg boiler according to the present invention, FIG. 2 is a circuit diagram of a heater control device thereof, and FIG. 3 is a diagram showing temperature changes during operation of the egg boiler. 1 to outer container, 2 to lid, 3 to heating container, 4 to egg stand, 5
-Temperature sensor, 6-insulator, 7-insulator, 8-heater, 9-projection, 10-egg, 12-hole, 13-projection,
14,15～ flow passage, 16 a heater controller, 17 comparing unit, 18 a heater driving circuit, 19 a reference temperature setting means, 20 notification unit, R _n ~ resistance, C _n ~ capacitor, Q
~ Transistor, OP _n ~ op-amp, FF _n ~ flip-flop.

Claims (1)

[Scope of utility model registration request] 1. A heating container provided with a heater, an egg stand placed in the heating container for mounting eggs, an outer container for insulating the heating container, and a controller for controlling the heater on / off, The control device is in close contact with the bottom of the heating container, and a temperature sensor arranged so as to be shielded from the outside air, and a reference temperature setting means for setting the upper and lower reference temperatures of the water temperature in the heating container. Comparing the detected temperature of the temperature sensor and the reference temperature from the reference temperature setting means,
Comparing means for outputting a signal for turning off the heater when the detected temperature reaches the upper limit reference temperature, and a signal for turning on the heater when reaching the lower limit reference temperature, and a heater circuit based on the output signal from the comparing means. An egg boiler comprising a heater driving circuit for turning on and off.