JPS62181014A - Control of boiling time of electric pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for controlling boiling time in an electric kettle.

(Prior art) Conventionally, electric kettles with a boiling function have... ′
If a temperature detection element is provided to detect easy temperature and boiling is detected, 1. When boiling is detected, the water is allowed to boil for a certain period of time regardless of the amount of water, and then the power to the water heater is cut off.

)--No second τ-Se4shi no 1 inn \--i ('J
4 monme) 121 soup powder: [7kl] This has a unique odor because it contains bleaching powder for disinfection and sterilization.

To remove this odor, water must be heated for a certain period of time.

(Problem to be solved by the invention) However, with the conventional electric pot, when the amount of water is large, it is heated enough to boil, and the scale is completely removed, but when the amount of water is small, it is short-lived. Since the drinking water boils over a period of time, the limescale in the drinking water cannot be completely removed, and the user feels uncomfortable due to the smell of the limescale.

(Means for solving the problems) Since the present invention has been made to solve the above problems,
In an electric kettle that is equipped with a temperature detection element to detect the temperature of water, the water L1 is detected from the tendency of the water temperature to rise during the boiling process,
The smaller the amount of water, the longer it will boil, so add 1 strainer.

In other words, while the water is being boiled, the amount of water in the electric kettle is detected by measuring the time required to raise the temperature between two set temperatures.Based on this result, if the amount of water is low, the amount of water is boiled for a longer time to remove enough scale. Conversely, if the amount of water is large, the boiling time is shortened, and scaling is efficiently removed depending on the amount of water.

(Example) The present invention will be described below with reference to the accompanying drawings which are one example.

FIG. 1 shows an electric bot 1 according to the present invention, with an exterior body 2
An inner container 3 is provided inside the inner container 3, and an Ext heater 4 and a heat-retaining heater 5 are provided at the bottom of the inner container 3.

Further, the lid body 6 is provided with a steam exhaust hole 7, and the steam exhaust hole 7 communicates with the internal space S of the inner container 3 via a steam passage 8.

The steam passage 8 and the outer surface of the inner container 3 are provided with temperature detecting elements T H each consisting of a thermistor.

TH, is provided, and the temperature detection element TH3 is connected to the steam passage 8.
Detects the temperature of the steam passing through the temperature detection element THff
i is configured to indirectly detect the water temperature via the inner container 3.

The heaters 1, 51. L and temperature detection element TH.

-T 1.1 is controlled according to the control circuit shown in FIG. 2 and the flowchart shown in FIG.

Control circuit description The control circuit shown in FIG. 2 will be explained below.

In FIG. 2, between the AC power sources 20, there are relays 24. ．． 26 contacts 24a and 26a are connected via a water heater 4 and a heat-retaining heater 5, respectively.

The AC power source 20 is transformed into a predetermined voltage by a transformer 21 and then rectified into a DC voltage by a rectifier circuit 22.

A relay 24 is connected between the [F] terminal and the e terminal of the rectifier circuit 22 via a switching transistor 23, and a transistor 25 and a relay 26 are connected in series in parallel thereto. Note that the control terminals g of the microcomputer 30 are connected to the bases of the transistors 23 and 25.
h are connected, and 27 and 28 are protection diodes of the transistors 23 and 25, respectively.

Further, a temperature detection element TH and a resistor R1 are connected in series between the ○ and ○ terminals in nq, and the contact a is connected to the comparison input terminal 2a of the comparator 31.

Similarly, a resistor R1 and a resistor R3 are connected in series between the terminals, and the contact point is the reference input 1m of the comparator 31.
b, and the output terminal e of the comparator 31 is connected to the microcomputer 30.

Therefore, in the comparator 31, a constant voltage is input from the reference input terminal 2b, and the other comparison person's horn terminal 2a
The set temperature (
It is determined whether the steam temperature is above or below T3). Note that this discrimination operation is controlled by the microcomputer 30. In addition, temperature detection element T I-1
When the steam temperature is detected to be T3 or higher in , the water in the inner container 3 is in a boiling state.

Similarly, a temperature detection element T is connected between the [F] and θ terminals.
H2 and a resistor R, and a resistor R5 and a resistor R6 are connected in series, and the contacts c and d of each circuit are connected to the comparison input terminal 2c and the reference input terminal 2d of the comparator 32, respectively, and the output terminal r of the comparator 32 is connected to the microcomputer 30.

Further, in the circuit having the temperature detection element T H2, the contacts S, S2 of the microcomputer 30 are connected to the resistors R, respectively.
11 and rt12.

Therefore, in the comparator 32, a constant voltage is inputted to the base input terminal 2d, and the other comparison input terminal 2d is inputted to the comparator 32.
From e, different voltages are manually applied depending on the water temperature, and the set temperature (
T I , T 2 ; T I < T , ) is determined to be above or below.

Explanation by J. Hako The following describes the control operation of the electric kettle I having the above configuration.
The explanation will be made according to the diagram and the flowchart in FIG.

- When the power is turned on at St, the voltage of the AC 7u source 20 is lowered by the transformer 21, and the voltage transformed into DC by the rectifier circuit 22 is applied to the microcomputer 30 and temperature detection elements Tl-1, TH2. is applied to a circuit with

(2) Then, when the unillustrated switch is turned on, the transistor 23 is turned on in response to a signal from the microcomputer 30 in S2, and the contact 24 of the relay 24 is thereby turned on. Turn on a and boil water depending on heater 1? Start the JAn cutting operation.

■ Subsequently, in S3, the temperature detection element T I-(2 measures the hot water temperature Ti, and the temperature detection element T I-(2) measures the water temperature Ti, and the temperature detection element T
The comparator 32 and microcomputer 30 determine whether or not this has been reached.

If it is confirmed that the water temperature Ti has reached the first set temperature T, the process proceeds to the next step 84 and starts a timer Ta (not shown) built into the microcomputer 30. If not, the process returns to S2 and starts boiling the water. Continue operation.

(2) Next, in S5, it is determined whether the temperature Ti detected by the temperature detection element TH has reached the second set temperature T. Note that this step is repeated until the hot water temperature T1 reaches the temperature T.

(2) When it is detected in S5 that the water temperature T1 has reached the second set temperature T2, the timer Ta is stopped in S6, and the elapsed time τ after starting the timer Ta is measured. In this time, the less water 1, the shorter the time, and the more water, the longer the time.

■ In S7 and S8, the elapsed time τ and the base time τ1. τ2(
T1 and T2), and the following S9. ~． Stl
The boiling time according to the amount of water (ts: t+, b, T3.1.
Set >1゜〉(3).

That is, if the water amount is small and τ is T1, the boiling time ts is set to tl in S9.

Moreover, if T1<τ×τ, the boiling time is determined in SIO and S is set to (t).

Further, if the amount of water is large and τ>T2, the boiling time is set to ts7'';T3 in S11.

■ After that, in S12, it is determined whether the steam temperature Tj detected by the temperature detection element TH has reached the third set temperature T3, and when it is confirmed that the steam temperature Tj has reached the temperature T, Proceed to Si2, where timer Tb is started. Note that this timer 'rb is built into the microcomputer 30.

(2) In S14, the time tb after the timer Tb starts 1- is determined by the time tb in S9. ~． It is determined whether or not the boiling time ts set in Sll has elapsed, and when it is determined that the elapsed time tb of the timer Tb has reached the boiling time ts, 915
Proceed to. Then, the transistor 23 is operated by a signal from the microcomputer 30, and the relay 24 is activated.
Turn off the contact 24a to cut off the power supply to the water heater 4.

In this way, when the amount of water in the electric pot I is small, the heating time to boil is short and the scale cannot be completely removed, so the boiling time ts is lengthened to remove scale.

On the other hand, when the amount of water in the electric kettle 1 is large, the water is sufficiently heated to boiling and most of the limescale is removed, so the boiling time ts is shortened to suppress power consumption.

■ When the water boiling is completed, the microcomputer 30
The transistor 25 energizes the dynamic heater 5 in response to a signal from the heater 5 to keep the hot water warm.

In the embodiment, the boiling time ts is divided into three stages Q1. b.

ta), but the present invention is not limited to this, and more setting times may be provided to perform finer control.

In addition, in the above embodiment, two set temperatures (T1°T2) are used.
Although the temperature detection element THt detects the temperature rise of the hot water relative to the temperature, the present invention is not limited to this, and one set temperature may be detected by the temperature detection element TH, and the other set temperature may be detected by the temperature detection element TH2. You may also do so. That is, the temperature detecting element T H2 detects the intestine T, and the steam temperature T2' corresponding to the thirst T2 is detected by the temperature detecting element T I-I,
Alternatively, the detection may be performed by

Furthermore, using the temperature sensing element T I ,
The trend in temperature may be detected by measuring the steam temperature by 4°.

(Effects of the Invention) As is clear from the above explanation, according to the control method of the electric bot according to the present invention, when the amount of water in the electric kettle is low, it boils in a short time, and then it takes 15 hours to boil. Because it is set long, scale can be completely removed,
We can always provide delicious hot water.

Furthermore, when there is a large amount of water, the boiling time is set short, so no unnecessary power is consumed.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an electric kettle according to the present invention;
FIG. 2 is a control circuit diagram, and FIG. 3 is a flowchart. ■... Electric pot, 2... Exterior body, 3... Inner container, 4... Boiling heater, 5... Warming heater, 6...
... Lid, 7 - Steam exhaust hole, 8... Steam passage, T I
I 3. T H2 = temperature detection element. Patent applicant Zojirushi Mahobin Co., Ltd. Agent
Patent attorney Aoyama Ao and 2 others Figure 1 H2

Claims (1)

[Claims] (1) A boiling time control method for an electric kettle that is equipped with a temperature detection element to detect the temperature of water, and the amount of water is detected from the tendency of the water temperature to rise during the boiling process, and the lower the amount of water, the longer the water is boiled. .