JPS60253420A - 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 reached 2 degrees Celsius, the water boiling control was stopped and the temperature was shifted to a warming operation. In this way, conventional electric pots boil the water in the pot to a predetermined high temperature without boiling it. However, it is known that tea and coffee taste better if boiled water is used. For this reason, it is desired to develop an electric kettle that can boil the water inside the pot, but in this case, if the pot had a sealed structure, high pressure would build up inside the pot, which would be extremely dangerous. For this reason, a structure is required to allow the steam inside the pot to escape.

However, in addition to this structure, boiling water also generates steam, so you need to be careful if you have small children or babies around. For this reason, when performing a boiling operation, it is necessary for the user to be sure to recognize the operation and start the operation, and it is necessary to prevent the boiling operation from being easily performed due to an erroneous operation.

[Purpose of the Invention] This invention has been made to satisfy such a need, and is to provide a device that can boil water in a pot, so that the boiling operation can be started only by operating two switches. The purpose of the present invention is to provide a boiling type electric kettle that can improve safety by doing so.

[Summary of the Invention] The present invention includes a water heater for boiling and controlling water in a pot, a water temperature detector for detecting the water temperature in the pot, a start switch for starting water heating control in the pot,
A boiling switch is provided to instruct the boiling operation, and when both the boiling switch and the start switch are turned on, electricity to the water heater starts, and the water temperature detector starts detecting the water temperature, and based on the detected water temperature, The water heater continues to be energized until the water in the pot boils, and when only the start switch is turned on, the water temperature detector starts to detect the water temperature, and starts boiling water based on this detected water temperature. The power supply to the heater is continued until the water temperature in the pot reaches a predetermined boiling temperature lower than the boiling temperature.

[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 step 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, located on the opposite side of the bottle 9, and is movable forward and backward.
This button 13 has an engaging claw 14 that engages with an engaging receiving portion 15 formed on the support plate 2. The lock button 13 is biased leftward in the figure by a spring 16, and this biasing force maintains the engagement between the engagement pawl 14 and the engagement receiving portion 15. 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 and 21 are provided on the upper lid 8, facing each other.
These locking bodies 20 and 21 engage with the annular groove 19. One of the locking bodies 2o 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 integrally has a knob 22 and is biased toward the left in the drawing by a spring 23, and this biasing force maintains the engagement between the locking body 21 and the annular groove 19.

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 during 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 frustoconical 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 urging force of the spring 10 and comes into pressure contact with the partition plate 28. It has an escape port 11 that constitutes a communication part that communicates the inside of 5 with the atmosphere, and this escape port '1
1 faces the valve body 33 at a distance. In addition, 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.
And a heat retention thermoswitch TR8 is attached. A lead-out pipe 37 is attached to the lower end of the tank 5, and the leading end of the lead-out 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 of the on-off valve mechanism.
0 is inserted through the operating shaft 40 so as to be freely forward and backward, and first and second valve bodies 41 and 42 made of an elastic material such as rubber are attached to the operating shaft 40, respectively. The operating shaft 40 is biased leftward in the figure by a spring 43, and this biasing force causes the first and second
The valve bodies 41 and 42 of the valve bodies 41 and 42 each elastically abut against the peripheral wall of the valve port 39, thereby closing the three valve ports in a fluid-tight manner. 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 moves toward the valve opening 3.
9, and then, with a slight delay, the second valve body 42 separates from the peripheral wall of the valve port 39, and the valve port 39 is opened. When the operating shaft 4O moves to the left in the drawing due to the biasing force of the spring 43, contrary to the above, the second valve body 42 first comes into contact with the peripheral wall of the valve port 39, and then the first valve body 42 comes into contact with the peripheral wall of the valve port 39. The valve body 41 abuts against the peripheral wall of the valve port 39 . Therefore, the valve body 4
There is no case where only one of the valve bodies 41.42 contacts the peripheral wall of the valve port 39 and the other does not, and both valve bodies 41,42 are always in contact with each other, so that the valve port 39 is reliably closed. Even if the second valve body 42, which is in direct contact with high-temperature water, deteriorates relatively early, the first valve body 4
1 can maintain the closed state of the valve port 39, so water flows through the valve port 3.
This has the advantage that there will be no leakage.

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. tfiJm device case 5
A control component 53 is provided inside the 0, and this control component 5
A large number of lead wires 54 are led out from the controller case 50 through a backing 55 provided at the lower edge of the controller case 5o. tank 5
A terminal 56 which is electrically connected to the heater 35, 96, the water temperature detector 36, and the thermoswitch TR3 is provided on the lower end surface, and the lead wires 54 are connected to the terminal 56. A leg body 60 formed in an annular shape is attached to the lower end opening of the case 1, a bottom plate 61 is provided inside the leg body 60, and a set screw 62 extends from the bottom plate 61 to the controller case 50. By tightening the set screw 62, the flange 6 of the tank 5 is crimped to the backing 7, and the backing 5 into which the lead wires 54 are inserted
5 is compressed, and the inside and outside of the controller case 50 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, and
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 vertically long measuring window 7.
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. The amount of water in the tank 5 can be known by visually observing it from 74 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, a boiling switch 80C, and each of these switches 80a to 80G.
Operation buttons 81a, 81b, 81c for operating the , and display elements (LEDs) 82a to 82 for displaying the control status thereof.
n are arranged in a concentrated manner. The operation buttons 81a to 81c and the display elements 82a to 82n are connected to the display section 7.
It faces the front surface of the display section 72 through the notch holes 83 . . . , 84 . A cover portion 73 in the lower half of the decorative plate 71 protrudes forward and covers the opening/closing valve mechanism 38. A pouring button 90 is provided inside the tip of this cover part 73, and this pouring button 9
0 is rotatably supported via a bottle 91, is biased clockwise in the figure by a spring 92, and has a protrusion 93 on the side surface, and this protrusion 93 serves as an operating shaft in the opening/closing valve mechanism 38. 40 and are in contact with each other.

By rotating this pouring button 90 counterclockwise in the figure using the bottle 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. Water in the tank 5 can be poured out through a 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 (CPLI) and a random access memory (RAM).
), read-only memory (ROM), various I1
The microcomputer 100 is equipped with a microcombiator 100 that includes a built-in 0 port, a clock signal generator, an A/Di conversion circuit, etc., and this microcomputer 100 includes a power transformer, a full-wave rectifier circuit, a transistor, a resistance element, etc., which are well-known as power supplies. A stabilized power supply circuit 101 consisting of the following is connected. In addition, the micro switch 69 and the normally open contact R of the water heater relay RL1 are connected to the commercial AC power source 101a.
For example, the water heater 35 of 670 W is connected via L1a in series, and the micro switch 69 is
and the heat retention heater 96 and the thermo switch TR via the normally open contact RL 2a of the heat retention heater relay RL2 in series.
A series circuit with 5 is connected. Each of the relays RLI,
One end of RL2 is connected to the positive terminal of the full-wave rectifier circuit in the stabilized power supply circuit 101, and the other end is connected to the microcomputer 100, and its operation is controlled by signals from the microcomputer 100. There is. The water) B detector 36 is connected to the microcomputer 100° via a reference voltage circuit 102 composed of a Zener diode ZD, resistors R1 to R4, and a capacitor C. Further, the start/cancel switch 80a, timer switch 80b, and boiling switch 80C are connected to the microcomputer 100 via diodes D1, D2, and D3, respectively. Further, the display section 72 is connected to the microcomputer 100 via resistors R1 to R9. This display section 72 includes each of the display elements 82a to 82.
n is connected in the matrix circuit, and 82a is connected to W.
# 82b is an LED for indicating boiling, 82c is an LED for indicating normal boiling, 8
2d is a heat retention display LED, and 82e to 82n are timer setting display LEDs.

When the microcomputer 100 receives the power w1o1a and outputs the voltage to the stabilizing power supply 1101, the microcomputer 100 outputs the voltage C.
An interrupt is entered at regular intervals according to a command from the PU, and the interrupt processing shown in FIG. 4 is performed. That is, when this process starts, 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 8.
The lights are turned on alternately in groups of 2n. Following this LED lighting process, the timer function performs a counting operation.

This counting operation is performed by counting one by one each time a side filling is performed. For example, when the boiling switch 80c is operated, the time required to accept the start/cancel switch 80a is 10.
It is used to count seconds, the time period for which the water heater 35 is energized after the start switch/cancel switch 80a is operated, the timer setting time, etc. Next, water temperature detector 3
It is checked whether or not the water temperature detected by step 6 is 110° C. or higher, and if it is 110° C. or higher, it is determined that dry cooking is being performed and a dry cooking set flag is set. If the temperature is lower than 110° C., the state of the start/cancel switch 80a, timer switch 80b, and boiling switch 80c is taken. 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 80b
If it is on, clear the count of the timer function and set the timer function again. Further, if the timer switch 80b is off, then it is checked whether the boiling switch 80c is on. And this switch 8
If 0C 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 reads the states of the start/cancel switch 80a, timer switch 80b, and boiling switch 80c, 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
~ 82n is flashed and water heater relay RLI is turned off.

Here, the dry cooking temperature was set at 110°C because the temperature at boiling never exceeds 100°C, and also because of the reliability of operation. When in the dry cooking state, the state of the start/cancel switch 80a is also taken in, and if this switch is on, the energy saving/warming operation control shown in FIG. 7 is performed. On the other hand, if it is not in the dry cooking state, the state of the timer switch 80b is read. This switch 8
If this switch 80b is in the on state, the timer setting control shown in FIG. 8 is performed, and if this switch 80b is in the off state, the state of the start/cancel switch 80a is taken. If the start/cancel switch 80a is on, the control shown in FIG. 7 is performed, and if it is off, the water temperature detector 36
Check to see if 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, this switch 80C is turned off.
It is checked whether 10 seconds have elapsed since 0c was turned on, and if the start/cancel switch 80a is operated before 10 seconds elapse, the boiling control shown in FIG. When the time elapses, control is returned to initialization.

The boiling control shown in FIG. 6 first initializes, then boils I!
The water boiling display LED 82a is turned on, and the Iil boiling heater relay RL1 is turned on. Subsequently, the water ITo 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. When the water temperature T reaches T++10°C, the rate of change in temperature rise is determined from the starting temperature TD and the counted energization time, and from this rate of change, the water in the tank 5 reaches the current temperature, that is, To+10°C, until it boils. Time required1. is calculated, and thereafter the water heater is energized for that 1D period. After that, if this energization time elapses or it starts midway,
The water heater 35 continues to be energized unless a cancellation operation is performed using the cancellation 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. Then control is transferred to FIG. 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.

The energy saving and heat retention control shown in FIG. 7 starts with the timer switch 80b and the boiling switch 80b. Check whether the OC is on.

If the timer switch 80b is on, the control shifts to FIG. 8, and even if the timer switch 8ob is off, if the boiling switch 80c is on, the process shifts to the 10 seconds shown in FIG. Move to waiting processing. When the timer switch 80b and the boiling switch 80c are both in the OFF state, it is next checked whether the water temperature in the tank 5 is 85° C. or lower. Then, if the temperature is not below 85℃, the heat retention display LED 82d is lit.
The boiling water heater relay RL1 is turned off, and the warming heater relay RL2 is turned on, thereby transitioning from the boiling operation to the warming operation. Additionally, if the water temperature is below 85°C, it is determined that water has been replenished midway through, and the heater relay RL, 2
is turned off, the boiling completion display LED 82b is turned off, the normal water boiling display LED 82c is lit, and the water heater relay R11 is turned on. Next, there is a cancellation using the start/cancellation switch 80a, but although the water temperature in the tank 5 is 96.5°C or higher, it is checked sequentially whether the timer switch 80b and boiling switch 80C are on, and the cancellation is canceled. If the water temperature is 96.5 degrees Celsius or higher, the process returns to the beginning of the process as shown in FIG. 5. If the timer switch 80b is on, the process proceeds to the process shown in FIG. and if the boiling switch 80c is on, the process is shifted to the 10-second duration process shown in FIG.
Further, if this switch 80c is off, the process is returned to turning off the thermal insulation heater relay RL2.

The timer setting process shown in FIG. 8 first turns off the water heater relay RL1, then sets the timer time, and if no start operation is performed with the start/cancel switch 80a within 4110 seconds of this setting, the process is restarted. Return to the initialization shown in Figure 5 and start again within 10 seconds.
When a start operation is performed using the cancel switch 80a, the timer setting display LEDs 82e to 82n are turned off one by one until the set timer time elapses. 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. The timer switch 80b is turned off when the timer time elapses, and the boiling switch 80c is turned off when boiling control is completed.

In the apparatus according to the embodiment of 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 water starts! The water boiling display ED 82a lights up and the water heater relay RLI is turned on to start energizing the water heater 35 and start the boiling operation.

In addition, if only the start/cancel switch 80a is operated, the normal water boiling display LED 82c lights up and the water boiling heater relay RL1 is turned on, causing the water boiling heater 35 to turn on.
energization is started, and normal water boiling operation is started. At the same time as the start, the water temperature detector 36 detects the water a in the tank 5.
Detection of fflTo 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 1. The time required for energizing the water boiler heater 35 until the water in the water boils. Calculate. In this manner, during the boiling operation, the energization time until boiling is calculated from the rate of increase in water temperature, and the energization of the water heater 35 is controlled based on the energization time. When this time has elapsed, the kettle heater relay RL1 is turned off, power supply to the kettle heater 35 is stopped, the boiling completion indication LED 82b lights up, and the boiling water indication LED 82 is turned off.
a goes out. And after that, the thermal insulation heater relay RL
2 is turned on and the warming operation is performed. In addition, in the case of normal water boiling operation, when the water temperature reaches 96.5℃, the water heater 3
5 is stopped, and energization to the heat-retaining heater 96 is started, thereby transitioning to a heat-retaining operation.

To start boiling operation like this, boil switch 8
Since it is necessary to turn on 0C and then turn on the start/cancel switch 80a within 10 seconds, the boiling operation will not start unless the user recognizes that the boiling operation will be performed and operates the switch. Therefore, there is no risk of starting a boiling operation by mistake compared to a normal water boiling operation.

Therefore, the boiling operation is not started unintentionally, and safety can be improved.

[Effects of the Invention] As detailed above, according to the present invention, in a device capable of boiling water in a pot, safety is improved by making it possible to start the boiling operation only by reoperating two switches. It is possible to provide a boiling type electric kettle that can be used.

[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, Fig. 6 is a flowchart of boiling processing, and Fig. 7 is a flowchart of normal water boiling and warming processing. Flowchart FIG. 8 is a flowchart of the timer setting process. 5...Tank, 35...Kettle heater, 36...
Water temperature detector, 80a...start/cancel switch,
80C... Switch for boiling, 100... Microcomputer, RLl... Relay for boiling water heater. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] a water heater for boiling and controlling the water in the pot; a water temperature detector for detecting the temperature of the water in the pot; a start switch for starting water heating control in the pot; and a boiling switch for instructing a boiling operation; By turning on both the boiling switch and the start switch, the water heater starts to be energized, and the water temperature detector starts detecting the water temperature, and based on this detected water temperature, the water heater is turned off. boiling control means that continues until the water in the boiler boils and stops energization after boiling; and when only the start switch is turned on, energization to the water boiling heater is started and water temperature detection by the water temperature detector is started; Based on this detected water temperature, electricity is applied to the water heater to bring the water temperature of the pot to a boiling point! A boiling type electric kettle characterized by being provided with a normal kettle boiling control means that continues boiling water until it reaches a preset predetermined water boiling temperature lower than the boiling water temperature, and stops electricity supply after reaching the boiling temperature.