JPS60253418A - Boiling type 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] [Technical field of invention] This invention relates to improvements in boiling type electric kettles.

[Technical background of the invention and its problems] Conventional electric pots supply water into the pot and raise the water to a predetermined boiling temperature, for example, 92°C.
When the temperature reaches 2 degrees Celsius, the water boiling control is stopped and the water is kept warm (X).In this way, conventional electric kettles boil the water in the pot to a predetermined high temperature without boiling it. However, it is known that the taste of tea and coffee becomes better when boiled before using. For this reason, the development of an electric kettle that can boil the water in the pot is necessary. Although this is desirable, in this case, if the pot were to have a sealed structure, the pressure inside the pot would be high, which would be extremely dangerous.For this reason, a structure is required to allow the steam inside the pot to escape.

On the other hand, in an electric kettle, if a so-called dry boiling situation occurs, in which the water heater is energized even though there is no water in the pot, the pot will reach an abnormally high temperature, resulting in an extremely dangerous situation. Therefore, when the inside of the pot reaches an abnormally high temperature state, it is necessary to detect this and stop the power supply to the heater or notify the user of the abnormal state. If you think about it this way, boiling type electric kettles require three types of control: boiling control, heat retention control, and abnormal high temperature control.However, these three types of control are performed using separate temperature sensors. This requires multiple temperature sensors, and installation poses various problems such as space and high cost.

[Purpose of the Invention] This invention has been made in view of the above points, and allows boiling control, heat retention control, and abnormally high temperature control to be performed using a common water temperature detector, and installation requires less space. The purpose of the present invention is to provide a boiling type electric kettle that does not cause various problems such as low cost and low cost.

[Summary of the Invention] This invention provides a water heater with a relatively large calorific value that controls the water in the pot to a boiling temperature, a water heater with a relatively small calorific value that controls the water temperature in the pot to keep it warm, and a water heater that controls the water temperature in the pot. a water temperature detector that detects water temperature, a start switch that starts water heating control in the pot, and a water temperature detector that starts energizing the water heater and starts detecting the water temperature in response to turning on the start switch. , tlAF! based on this detected water temperature. A boiling control means that continues energizing the B-heater until the water in the pot boils and stops the energizing after am, and this boiling 1! IIIJ I
[a heat retention control means that controls the supply of electricity to the heat retention heater on and off based on the water temperature detected by the water temperature detector after the boiling operation by the first means to maintain the water temperature in the pot approximately at a predetermined temperature, and a water temperature detector; An abnormality control means is provided which controls to stop energizing the water heater and the heat-retaining heater when the temperature detected by the water temperature sensor reaches a predetermined temperature higher than a preset boiling concentration. This is commonly used for boiling control, heat retention control, and abnormal high temperature control.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a cylindrical case forming an outer cylinder of the pot, and a support plate 2 is attached to the upper opening of the case 1. This support plate 2 has a large opening 3 in the center, and a stepped portion 4 is formed around the periphery of this opening 3. A tank 5 is housed inside the case 1 and is formed into a cylindrical shape with a bottom and forms an inner cylinder of the pot.
The flange 6 is in contact with the stepped portion 4 via the backing 7'. An upper cover 8 is provided on the upper surface side of the support plate 2, and the upper cover 8 is rotatably attached to the support plate 2 via a bottle 9. A lock button 13 is provided on the upper lid 8 on the opposite side of the bottle 9 so as to be able to move forward and backward, and this button 13 has an engaging claw 14.
is engaged with an engagement receiving portion 15 formed on the support plate 2.

The lock button 13 is urged leftward in the figure by a spring 16, and this urging force causes the engagement pawl 14 and the engagement receiving portion 15 to
The engagement is maintained. By moving the lock button 13 rightward in the figure against the spring 16, the engagement between the engagement pawl 14 and the engagement receiving portion 15 can be released.

An inner cover 18 is provided inside the upper cover 8, and this inner cover 18
An annular groove 19 is formed on the outer circumferential surface of. A pair of locking bodies 20.21 are provided on the upper lid 8 to face each other, and these locking bodies 20.21 engage with the annular groove 19. One locking body 20 is fixed to the upper lid 8, while the other locking body 21 is supported so as to be movable forward and backward. This locking body 21 has a knob 22 integrally, and a spring 2
3 biases the locking body 2 to the left in the figure, and this biasing force causes the locking body 2 to
1 and the annular groove 19 are maintained.

Then, by pinching the knob 22, the locking body 21 is attached to the spring 23.
By moving the locking body 21 and the annular groove 19 to the right in the figure against the movement, the engagement between the locking body 21 and the annular groove 19 can be released, and by this release, the inner cover 18 can be removed from the upper cover 8 for cleaning etc. It has become. A backing 25 is attached to the periphery of the lower end opening of the inner lid 18, and this backing 25 is in airtight contact with the flange 6 of the tank 5. Further, a steam cylinder 24 is integrally formed in the center of the upper surface of the inner lid 18 to protrude, and the upper end surface of the steam cylinder 24 is exposed flush to the upper surface of the upper lid 8 through the backing 17, and a plurality of passages are provided on this exposed surface. Stomata 26...
・Perforated. A safety valve mechanism 27 is provided inside the steam cylinder 24. To explain this safety valve mechanism 27 in detail, 28 is a partition plate attached to the lower end opening of the steam cylinder 24, and the partition plate 28 has an opening in the center. 29 is formed. A valve holder 30 is provided below the partition plate 28, and this valve holder 30 is provided with a truncated conical recess 32 having a tapered surface 31. A valve body 33 consisting of the following is accommodated. A movable plate 34 is provided on the upper surface of the partition plate 28 to face the opening 29, and this movable plate 34 is pressed downward by the biasing force of the spring 10 and comes into pressure contact with the partition plate 28. It has an escape port 11 constituting a communication portion that communicates the inside with the atmosphere, and this escape port 11 faces the valve body 33 at a distance. Note that 12 is a protective cover that covers the outer periphery of the valve holder 30.

A water boiling heater 35 and a heat-retaining heater 96 formed in the shape of a strip are wound around the outer periphery of the lower end of the tank 5, and a water temperature detector 36 made of, for example, a negative characteristic thermistor is placed in the middle thereof.
is installed. At the lower end of the tank 5 is a conduit and an outlet pipe 3.
7 is attached, and the distal end of the outlet pipe 37 is inclined obliquely upward and projects to the outside of the front side of the case 1. An on-off valve mechanism 38 is provided at the protruding end portion,
To explain this on-off valve mechanism 38 in detail, numeral 39 is a valve port, and an operating shaft 40 is inserted into this valve port 39 so as to be freely advanced and retracted. Valve bodies 41, 42 are installed. Operation axis 4
0 is biased leftward in the figure by a spring 43, and this biasing force causes the first and second valve bodies 41, 42 to close the valve port 39.
The valve opening 39 is fluid-tightly closed by elastically abutting against the peripheral wall of the valve opening 39, respectively. The second valve body 42 integrally has a cylindrical thin wall portion 45 on its periphery, and this thin wall portion 45 is elastically deformed to spread around its outer periphery due to the biasing force of the spring 43, so that the thin wall portion 45 is elastically deformed around the valve port 39. Close to the wall. Therefore, when the operating shaft 40 is operated to move rightward in the figure against the spring 43, the first valve body 41 first separates from the peripheral wall of the valve port 39, and then, slightly later, the second valve body 41 separates from the peripheral wall of the valve port 39. The valve body 42 is separated from the peripheral wall of the valve port 39, and the valve port 39 is opened.

Then, when the operating shaft 40 moves to the left in the figure due to the biasing force of the spring 43, the second valve body 4 first moves, contrary to the above.
2 comes into contact with the peripheral wall of the valve port 39, and then the first valve body 41
comes into contact with the peripheral wall of the valve port 39. Therefore, the valve body 41.4
There is no case where only one of the valve bodies 41.2 comes into contact with the peripheral wall of the valve port 39 and the other does not.
42 abuts against each other, thereby reliably closing the valve port 39, and even if the second valve body 42, which is in direct contact with high-temperature water, deteriorates relatively early, the first valve body 41 to maintain the closed state of the valve port 39, there is an advantage that water will not leak from the valve port 39.

A support fitting 48 is provided on the lower end surface of the tank 5, and a saucer 49 and a controller case 50 are attached to the lower end of the support fitting 48. The saucer 49 is inclined in one direction, and a discharge port 51 is formed in a part of the lower end of the slope.
A discharge pipe 52 is connected to. A control component 53 is provided inside the controller case 50, and a large number of lead wires 54 led out from the control component 53 are connected to the controller case 5.
It is drawn out to the outside of the controller case 5o through a backing 55 provided at the lower edge of the controller case 5o. A terminal 56 electrically connected to the heater 35, 96 and the water temperature detector 36 is provided on the lower end surface of the tank 5, and the lead wires 54 are connected to this terminal 56. A leg body 60 formed in an annular shape is attached to the lower end opening of the case 1, and a bottom plate 61 is provided inside the leg body 60.
A set screw 62 is screwed from the top to the controller case 50, and by tightening the set screw 62, the flange 6 of the tank 5 is crimped to the backing 7, and the backing 55, into which the lead wires 54 are inserted, is tightened. Compress and control case 50
The inside and outside are sealed.

A fall switch mechanism 68 is provided on the top surface of the bottom plate 61,
This overturning switch mechanism 68 includes a base 64 having a truncated conical recess 63 having a tapered surface 63a, etc.
3 and a microswitch 69 attached to the upper end surface of the base 64. The microswitch 69 has a push button 66 that protrudes elastically, and the pushing and retracting operation of the push button 66 opens and closes the energizing circuits for the heaters 35 and 96. A movable operation plate 67 is provided on the upper surface of the recess 63, and the push button 66 is placed across the operation plate 67.
is facing the weight 65.

A transparent water level pipe 70 that communicates with the upper and lower ends of the tank 5 is vertically provided on the outside of the side surface of the tank 5.
protrudes to the outside of the front side of the case 1. A decorative board 71 is attached to the front of the case 1, and this decorative board 71 is attached to the second
As shown in the figure, it consists of a display section 72 in the upper half and a cover part 73 in the lower half. The display section 72 has a vertical measuring window 74.
A transparent metering cover 75 is attached to the metering window 74 from the inside with screws 76, and the water level pipe 70 is disposed facing inside the metering cover 75, and the water level tube 70 is connected to the metering window 74. The amount of water in the tank 5 can be known by visually observing it through the metering cover 75.

Further, inside the display section 72, an operation board 78 is attached with screws 79.
The operation board 78 includes a start/cancel switch 80a, a timer switch 80b, and a boiling switch 80C1.
Operation buttons 81 a, 81 b, 81 c,
and a display element (LED) 82a that displays the formation status.
~82n are arranged in a concentrated manner. The operation buttons 81a to 81c and the display elements 828 to 82n face the front surface of the display section 72 through notch holes 83..., 84... formed in the display section 72. A cover portion 73 in the lower half of the decorative plate 71 protrudes forward and covers the opening/closing valve mechanism 38. And this cover part 73
A dispensing button 90 is provided inside the tip of the dispensing button 90, and this dispensing button 90 is rotatably supported via a pin 91, is biased clockwise in the figure by a spring 92, and is attached to the side. It has a protrusion 93, and this protrusion 93 faces and abuts the operating shaft 40 of the on-off valve mechanism 38.

By rotating the dispensing button 90 counterclockwise in the figure using the pin 91 as a fulcrum against the spring 92, the operating shaft 40 is moved to the right in the figure and the valve port 39 is opened. The water in the tank 5 can be poured out through the spout 95.

FIG. 3 shows a control circuit for controlling the boiling type electric kettle according to the present invention, and this control circuit is housed in the controller case 50. The control circuit includes a central processing unit (CPU) and a random access memory (RAM).
, read-only memory (ROM), various I10
A microcomputer 100 is provided with a built-in board, a clock signal generator, an AID conversion circuit, etc., and this microcomputer 100 includes a stable power supply including a power transformer, a full-wave rectifier circuit, a transistor, a resistor element, etc., which are well-known as power supplies. A power supply circuit 101 is connected thereto. In addition, the micro switch 69 and the normally open contact RL of the water heater relay RLI are connected to the commercial AC IF source 101a.
The kettle heater 35 of, for example, 670 W is connected in series through 1a, and the heat-retaining heater 96 is connected in series with the microswitch 69 and the normally open contact RL2a of the heat-retaining heater relay RL2. Each of the relays RL1 and RL2 has one end connected to the stabilized power supply circuit 1.
01, and the other end is connected to the microcomputer 100, and its operation is controlled by signals from the microcomputer 100.

The water temperature detector 36 includes a Zener diode ZD and a resistor R.
The reference voltage circuit 102 is connected to the microcomputer 100 through a reference voltage circuit 102 composed of R1 to R4 and a capacitor C. The microcomputer 100 is also connected to the start/cancel switch 80a and the timer switch 8 through diodes DI, D2, and D3, respectively.
0b and a boiling switch 80c are connected. Furthermore, the microcomputer 100 includes resistors R1 to R.
The display section 72 is connected via 9.

This display section 72 has the display elements 828 to 82n connected in a matrix circuit, with 82a being an LED for indicating boiling water, 82b being an LED for indicating boiling completion, and 82G being an LED for indicating normal water boiling. 82d is a heat retention display LED, and 826 to 82n are timer setting display LEDs.

When the power supply 101a of the microcomputer 100 is turned on and voltage is output to the stabilization 11m101,
An interrupt is generated at regular intervals according to a command from the CPU, and the interrupt processing shown in FIG. 4 is performed. That is,
When this process begins, other interrupts are first prohibited. Each time an interrupt is entered, the LEDs 82a to 82n are changed to a predetermined number, for example, LEDs 82a to 82d182e to 821.82j to
The lights are turned on alternately in groups of 82n. This LED
Following the lighting process, the timer function performs a counting operation. This counting operation is performed by counting one by one every time each separate charge is performed. For example, when the boiling switch 80C is operated, the start/cancel switch 80a is accepted.
It is used to count 0 seconds, the time during which the water heater 35 is energized after the start switch/cancel switch 80a is operated, the timer setting time, etc. Next, it is checked whether the water temperature detected by the water temperature detector 36 is 110° C. or higher, and if it is 110° C. or higher, it is determined that dry cooking is occurring, and a dry cooking set flag is set. Further, if the temperature is lower than 110°C, the states of the start/cancel switch, switch 80a, timer switch 80b, and boiling switch 80G are acquired. If the start/cancel switch 80a is on, it is determined whether this switch 80a was on at the time of the previous interrupt by reading it from the RAM, and if it was on at the previous time, the start/cancel switch 80a is set for the next interrupt. Shifts the count. However, if it was turned off last time, it is checked whether the electric kettle is currently in operation. If the switch is in the operating state, the switch operation is determined to be a cancellation operation and set to cancel, and if it is not in the operating state, it is determined to be a start operation and the operation is set to start. Further, if the previous start/cancel switch 80a is off, then it is checked whether the timer switch 80b is on. and timer switch 8
If 0b is on, the count of the timer function is cleared and the timer function is set again. Further, if the timer switch 80b is off, then the boiling switch 80b is turned off.
Check whether C is on. If this switch 80C is turned on, the count of the timer function is cleared and the boiling operation is set. Finally, a shift is performed to count the occurrence of the next interrupt, the interrupt is enabled, and this interrupt processing is completed.

Further, the microcomputer 100 is shown in FIGS.
The main control processing shown in the figure is performed. First, in FIG. 5, the microcomputer 100 has a start/cancel switch 80a1, a timer switch 80b1, a boiling switch 8
It reads the state of 0C and issues commands according to the states of these switches.

This process first enables interrupts, then performs initialization,
Check the empty cooking set flag. If this flag is set, it is determined that the cooking is empty, and each LED 82a
~82 Flash operation of n. Here, the dry cooking temperature is set at 110℃, and the boiling temperature is 100''CJ.
This is done in consideration of the reliability of the operation. When it is in the empty cooking state, start further.
The state of the cancel switch 80a is read, and if this switch is on, the energy saving/warming operation control shown in FIG. 7 is carried out, and in this control, the electricity supply to the water boiling heater 35 and the warming heater 96 is stopped. On the other hand, if it is not in the dry cooking state, the state of the timer switch 80b is read. If this switch 80b is in the on state, the timer setting control shown in FIG.
If 0b is in the off state, start/cancel switch 80
Take in the state of a. and start/cancel switch 8
If 0a is on, the control shown in FIG. 7 is performed, and if it is off, the water temperature detector 36 checks whether the water temperature is below 85°C. If the water temperature is higher than 85°C, the control shown in FIG. 7 is carried out, and if the water temperature is below 85°C, the state of the boiling switch 80c is taken next. If this switch 80C is off, this process is returned to the initialization described above, and if this switch 80c is on, it is checked whether 10 seconds have passed since this switch 80c was turned on. If the start/cancel switch 80a is operated before 10 seconds have elapsed, the boiling control shown in FIG. 6 will be entered, and if 10 seconds have elapsed, the control will be returned to initialization.

The boiling control shown in FIG. 6 is first initialized, then the boiling water display LED 82a is turned on, and the water boiling heater relay RL1 is turned on. Subsequently, the water ITa in the tank 5 at the time of starting is detected based on the signal from the water temperature detector 36. Then, the internal clock counts the energization time using the count function until the water temperature rises by 10°C. Then, when the water temperature T reaches To + 10℃, the starting temperature T
Determine the rate of change in temperature rise from the energization time counted as O,
From this rate of change, the water in tank 5 is at its current temperature, that is, T
Time required to boil from o+10℃ 1. is calculated, and thereafter the water heater is energized for the period to. Thereafter, the water heater 35 continues to be energized until this energization time elapses or unless a cancellation operation is performed using the start/cancel switch 80a. When this energization time has elapsed, the kettle heater relay RLI is turned off, the boiling completion display LED 82b is turned on, and the boiling water display LED 82a is turned off. At this time, the boiling switch 80C returns to the OFF state. and control the seventh
Move to figure. Note that if the energization time is canceled during the elapse of the energization time, the control returns to the initialization in the process shown in FIG. 5 described above.

In the energy saving and heat retention control shown in FIG. 7, first, it is checked whether the timer switch 80b and the boiling switch 80C are in the on state.

If the timer switch 80b is on, the control shifts to FIG. 8, and even if the timer switch 80b is off, if the boiling switch 80c is on, the process shifts to 10 seconds as shown in FIG. Shift to existing processing. When the timer switch 8ob and the boiling switch 80c are both in the off state, it is next checked whether the water temperature in the tank 5 is below 85°C. If the temperature is not below 85℃, the ED82d is turned on to indicate the temperature.
Turn off the water heater relay RL1, and keep the water heater relay RL off until the water temperature in the tank 5 drops to 92°C or less.
2 is held off. Thereafter, when the water temperature in the tank 5 falls to 92° C. or lower, the heat-retaining heater relay RL2 is turned on to start energizing the heat-retaining heater 96 and start the heat-retaining operation. In this heat-retaining operation, when the water temperature in the tank 5 reaches 96.5°C or higher, the heat-retaining heater relay RL is activated.
By turning off the heater 96 and stopping the supply of electricity to the heat insulating heater 96, the water temperature in the tank 5 is maintained substantially constant within the range of 92° to 96°5°C. Furthermore, if the water temperature is below 85°C, it is determined that water has been replenished during the process, and the heater relay RL2 is turned off, the boiling completion display LED 82b is turned off, and the boiling completion display LED 82c is turned on. , and turn on the water heater relay RLI. Next, if there is a cancellation using the start/cancel switch 80a, or if the water temperature in the tank 5 is 96.5°C or higher, the timer switch 80. It is checked sequentially whether b is on or the boiling switch 80c is on, and if there is a cancellation, the process moves to the initialization shown in Fig. 5, and if the water temperature is 96.5°C or higher, this process is If the timer switch 80b is on, the process shifts to the process shown in FIG. 8, and if the boiling switch 80c is on, the process shifts to the 10-second duration process shown in FIG. If this switch 80C is off, the process is returned to turning off the thermal insulation heater relay RL2.

Therefore, in this control, both the timer switch 80b and the m-paper switch 80c are turned off, and if the detected water temperature of L-1 is 96.5 degrees Celsius or higher, both the water heater 35 and the heat retention heater 96 are de-energized. As a result,
This is heater control until the water temperature drops below 96.5° C. after boiling control or when the water is in an empty state.

The timer setting process shown in FIG. 8 first turns off the water heater relay RL1, then sets the timer time, and within 10 seconds after this setting, the start/cancel switch 8
If the start operation using 0a is not performed, the process will be performed in the fifth step.
If the initialization shown in the figure is restored and the start operation is performed using the start/cancel switch 80a within 10 seconds, the timer setting display L will continue until the set timer time elapses.
Turn off the EDs 82e to 82n one by one. If there is a cancellation operation during the timer operation, the process returns to the initialization process shown in FIG. 5, and when the timer setting time has elapsed, the process shifts to the process shown in FIG. 7. Note that the timer switch 80b is configured to return to the OFF state when the timer time elapses.

In the device according to the present invention configured as described above, if water is poured into the tank 5, the boiling switch 80c is operated, and the start/cancel switch 80a is operated within 10 seconds, the boiling 1 m boiling display is displayed. As the LED 82a lights up, the kettle heater relay RL1 is turned on, energization to the kettle heater 35 is started, and the boiling operation is started. If only the start/cancel switch 80a is operated, the normal water boiling display LED 82c lights up, the water heater relay RL1 is turned on, electricity is started to be supplied to the water heater 35, and the normal water heating operation is started. At the same time as the start, the water temperature detector 36 detects the water mT in the tank 5.
Detection of o is started.

Then, during boiling operation, the counting operation of the energization time is started, and when the water temperature rises by 10℃, the rate of change in water temperature is calculated from the water temperature To at the start and the energization time until it rises by 10℃, and from that change rate, the tank The amount of electricity RatD required to supply water to the water heater 35 until the water in the water boils is calculated.

In this way, during boiling operation, from the rate of increase in water temperature
The total time until I is calculated, and the total time is til! Electricity supply to the water heater 35 is controlled based on the water heater 35.

When this time has passed, the water heater relay RL
1 is turned off and power supply to the water heater 35 is stopped,
The LED 82b for indicating completion of boiling lights up and the LED 82a for indicating boiling water goes out. Thereafter, power supply to the heat retention heater 96 is stopped until the water temperature in the tank 5 drops to 92°C or less, and when the water temperature in the tank 5 drops to 92°C or less, the heat retention heater relay RL2 is turned on. Power supply to the heat-retaining heater 96 is started. When the water temperature reaches 96.5° C. or higher, power supply to the heat-retaining heater 96 is stopped. In this way, the temperature of the water in the tank 5 is maintained substantially constant within the range of 92.degree.

Further, in the case of normal water boiling operation, when the water temperature reaches 96.5° C., power supply to the water boiling heater 35 is stopped, and thereafter, heat retention control is performed in the same manner as described above.

Additionally, if the water in the tank 5 runs out during such boiling control, normal water boiling control, or heat retention control, and a phenomenon occurs in which the temperature of the tank 5 becomes abnormally high, the water temperature detector 36 detects that the temperature exceeds 110°C. When this is detected, the empty cooking set flag is set, and all the display elements 828 to 82n flash to notify this fact, and the heater control becomes the same as the state immediately after boiling is completed, and the water boiler heater 35 and heat retention are activated. Electricity to the heater 96 is completely prohibited.

In this way, safety against abnormally high temperatures can be ensured.

In this way, boiling control, normal water boiling control, heat retention control, and abnormal high temperature control can be performed using the common water temperature detector 36, so only one sensor is needed, which reduces installation space and costs. You can also aim for

[Effects of the Invention] As detailed above, according to the present invention, boiling control, heat retention control, and control during abnormally high temperatures can be performed using a common water temperature detector, and installation is a matter of space and cost. It is possible to provide a boiling type electric kettle that does not cause various problems such as.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is an overall sectional view, FIG. 2 is an exploded perspective view of the display section, FIG. 3 is a circuit configuration diagram, and FIGS. 4 to 8 are These are flowcharts showing the control processing of the microcomputer. Fig. 4 is a flowchart showing interrupt processing, Fig. 5 is a flowchart showing main processing, and Fig. 6 is a flowchart showing 11M.
FIG. 7 is a flowchart showing processing for abnormally high temperature, normal boiling water, and heat retention mode, and FIG. 8 is a flowchart for timer setting processing. 5...Tank, 35...Kettle heater, 36...
Water temperature detector, 80a...start/cancel switch,
8Qc...Switch for boiling, 100...Microcomputer, RLI...Relay for boiling water heater, RL
2...Relay for heat retention heater. Figure 6 -) (ES

Claims (1)

[Claims] A water heater with a relatively large calorific value that controls the water in the pot to S-boil, a heat-retaining heater with a relatively small calorific value that controls the water temperature in the pot to keep it warm, and a water temperature detector that detects the water temperature in the pot. and a start switch for starting the water heating control in the pot, and in response to the turning on of the start switch, starts energizing the water heater and starts detecting the water temperature by the water temperature detector. boiling control means that continues energizing the water heater until the water in the pot boils based on the water temperature and stops the energization after the water boils; and a water temperature detected by the water temperature detector after the boiling operation by the boiling control means. a heat-retaining controller that controls on/off energization of the water heater to maintain the water temperature in the pot approximately at a predetermined temperature when the water temperature reaches a predetermined concentration higher than the boiling temperature; A boiling type electric kettle characterized by being provided with an abnormality control means for controlling to stop the supply of electricity to the heater and for controlling to notify an abnormal heating state.