JP3168984B2 - Electric hot water storage container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot water storage container which heats a content liquid with a heater to heat and keep the water warm.

[0002]

2. Description of the Related Art In an electric pot, the temperature of a content liquid to be heated which is contained in a container and heated is controlled by a container to control the energization corresponding to the temperature of the content liquid when heating the content liquid to perform water heating or heat retention. It has long been used in combination with a temperature sensor for detecting the temperature of the steam generated in the container and a steam sensor for detecting the temperature of the steam generated in the container through a steam passage for discharging the steam to the outside (Japanese Utility Model Application Laid-Open No. 62-18902). Gazette, Jpn.
No. 480).

However, today, Japanese Patent Application Laid-Open No.
JP, JP-A-09-5692 and JP-A-Heisei 1
As known in Japanese Patent Application Laid-Open No. 0-108788, etc., the power supply to the heater is controlled only by temperature information from a temperature sensor that detects the temperature of the liquid content via a container, and the heater is used for water heating, water removal including descaling, and heat retention. Achieving each mode has become mainstream. This eliminates the increase in cost due to the use of two temperature sensors and two steam sensors, and achieves relatively desired control by variously devised energization controls.

[0004]

However, recently, recently,
It is possible to immediately discharge a high-temperature content liquid from the heat retention state, and also to discharge a freshly-boiled content liquid by a re-boiling operation with a short waiting time. There is a tendency to keep warm. In addition, from the liquid content, steam starts to be generated in a state close to boiling, and in the normal boiling state in which vaporization in the liquid is activated, a large amount of high-temperature steam is generated vigorously and vigorously. As boiling continues, it is also desirable to reduce the generation of steam so that children and other children do not touch or be surprised by the steam or feel hot.

In order to satisfy these requirements, it is necessary to ensure that the content liquid is boiled for sterilization and desalting, and that the boiling state is maintained for a predetermined time.
It is necessary to control the energization so as to accurately maintain the predetermined boiling state in a temperature range in which the generation of steam is activated and does not reach the normal boiling state, and the subsequent heat retention does not reach the predetermined boiling state, but It is necessary to keep the temperature at a very high temperature.

Therefore, it is necessary to accurately maintain the content liquid in a very narrow temperature range regardless of whether the content liquid is boiled, kept boiling, or kept warm. However, in experiments conducted by the present inventors, it is difficult to accurately maintain the content liquid in such a narrow temperature range if the current control is performed as in the related art without using a vapor sensor. This has been found to be due to an error of ± several degrees Celsius between the actual temperature and the temperature detected by the temperature sensor.

[0007] It is an object of the present invention to provide an electric hot water storage container capable of reliably boiling a content liquid or maintaining a boiling state while suppressing generation of steam only by temperature information from a temperature sensor.

[0008]

In order to achieve the above object, an electric hot water storage container according to the first aspect of the present invention comprises a temperature sensor for detecting the temperature of a liquid contained in the container and heated by a heater via the container. In the water heating mode in which the content liquid is heated and kept warm while controlling the power supply to the heater based on the detected temperature, the content liquid reaches a predetermined temperature near the boiling point in the water heating mode for performing the water heating. After the time when the temperature sensor detects that the heating operation has been performed, a control unit is provided for controlling the power supply so as to reduce the power consumption of the heater to obtain a predetermined boiling state before normal boiling at which vaporization in the liquid is activated. The power supply control for reducing the power consumption of the heater is performed after the power supply to the heater is temporarily stopped.

According to this, in the water heater mode, when the temperature sensor detects a predetermined temperature near the boiling point, the control means controls the energization so as to gradually reduce the power consumption of the heater. In contrast to the temperature of normal boiling, where vaporization is activated and a large amount of high-temperature steam is generated vigorously,
For example, by setting the temperature near the boiling point lowered by + several degrees C which is the error range on the high side detected by the temperature sensor, the heater is controlled to be at the maximum power consumption and the content liquid is discharged. By quickly raising the temperature to the predetermined temperature near the boiling point, it is assured that the content liquid has not yet reached the boiling point when the predetermined temperature is detected, and thereafter the power consumption of the heater is reduced stepwise, While preventing the contents liquid from reaching the normal boiling state by continuing the energized state with high power consumption up to that time, the heating to lower the power consumption of the heater to the predetermined boiling state afterwards while reducing the power consumption of the heater As a result, the predetermined boiling state can be reliably achieved, and the predetermined boiling state can be maintained as required.

In particular, when the power supply is controlled so as to reduce the power consumption of the heater when the temperature reaches a predetermined temperature, the power supply to the heater is temporarily stopped and then performed. When the content liquid is heated at a high rate, the content liquid is prevented from being continuously heated to reach a normal boiling state. A sustained state is obtained.

In the electric hot water storage container according to the second aspect of the present invention, the temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container, and the heater is energized based on the detected temperature. In the hot water mode in which the content liquid is heated and kept warm while controlling, the power consumption of the heater after the time when the temperature sensor detects that the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. Control means for controlling the power supply so as to lower the temperature, and obtaining a predetermined boiling state before normal boiling in which the vaporization in the liquid becomes active, a water heater for heating the content liquid in the water heating mode, and a water heater Power consumption is low, and a heat retention heater that heats the content liquid in the heat retention mode is provided. It is characterized by performing switching the energization in series with the heater and insulation heater.

According to this, while sharing the basic features and functions with the first aspect of the present invention, in particular, a water heater for heating the content liquid in the water heater mode, and the power consumption in the heat insulation mode which is smaller than that of the water heater and consumes less power. A heating heater for heating the liquid, and by switching the energization after the temperature reaches a predetermined temperature in the water heater mode to the energization in the series state of the water heater and the heat insulation heater, thereby performing both heaters in parallel from series. By increasing the resistance by switching, the energizing current is limited and the same heating condition as that of suppressing the power consumption is obtained, so that a complicated operation for controlling the energizing power is not required.

In the electric hot water storage container according to the third aspect of the present invention, the temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container, and the heater is energized based on the detected temperature. In the hot water mode in which the content liquid is heated and kept warm while controlling, when the temperature sensor detects that the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating, a heater is provided for a predetermined time. After the power supply to the heater is stopped, the heater is energized for a predetermined time at the maximum power consumption, and thereafter, the power supply is stopped at a predetermined time ratio, and the power supply is repeated, so that vaporization in the liquid is activated. It is characterized by comprising control means for controlling the energization so as to obtain a boiling state.

As a result, as described above, for example, when the temperature in the liquid reaches the normal boiling point where the vaporization in the liquid is activated and a large amount of high-temperature steam is generated vigorously, the temperature on the high side detected by the temperature sensor is detected. By setting the temperature at the vicinity of the boiling point, which is reduced by plus several degrees C which is the error range, the heater is controlled so as to have the maximum power consumption, and the content liquid is quickly raised to the predetermined temperature near the boiling point. At the time when the predetermined temperature is detected, the control means temporarily stops energizing the heater, and then energizes at the maximum power consumption for a predetermined time. After the temperature-rise characteristics of the battery have once been lowered, the boiling point is quickly and reliably brought close to the predetermined boiling state without causing normal boiling by energizing at the maximum power consumption, or the predetermined boiling state is obtained. By repetition of the energization stopping the energization at a predetermined time ratio to obtain the power consumption of the apparent freely predetermined boiling state and this standing condition it can be made to reliably obtained.

In the electric hot water storage container according to a fourth aspect of the present invention, the temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container, and the heater is energized based on the detected temperature. In the hot water mode in which the content liquid is heated and kept warm while controlling, the power consumption of the heater after the time when the temperature sensor detects that the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. Control means for obtaining a predetermined boiling state before normal boiling, in which vaporization in the liquid is activated, a notification means for notifying the boiling to the outside, and a predetermined boiling state. Control means for determining the boiling state at the final stage of the energization control for obtaining a predetermined boiling state, when the boiling determination means has reached the predetermined boiling state, it has not reached , After energizing a predetermined time of the heater at the maximum power, it is characterized by notifying the boil by informing means.

Thus, the boiling is notified by the notification means at the final stage of the energization control for obtaining a predetermined boiling state while sharing the operation with the basic features of the first aspect of the present invention, so that the generation of steam is suppressed. Even if the boiling state is hard to be visually recognized outside, the user can know that the content liquid has reached a predetermined boiling state by the notification, and this is a standard for timing when the use of the content liquid can be started. It is convenient. Also, at the final stage of energization control for obtaining a predetermined boiling state, if the predetermined boiling state has not been determined yet, the heater is energized at the maximum power consumption for a predetermined time. Even if the liquid has not yet reached boiling, in response to this, the heater is energized for a predetermined time at the maximum power consumption, thereby reliably obtaining a predetermined boiling state in a short time and reporting this, Even if normal boiling, in which a large amount of high-temperature steam is rushed, can be avoided in a very short time, it is possible to prevent the content liquid from being used without boiling.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, typical embodiments of the present invention will be described together with examples thereof with reference to FIGS. 1 to 4 to provide an understanding of the present invention.

This embodiment is an example of an electric pot used at home or the like. As shown in FIGS. 1 and 2, an inner case made of a metal such as stainless steel is placed in an outer case 1 made of a synthetic resin. 2, and the flange 2 a of the inner container 2 is received from below through the seal packing 51 by the shoulder member 3 fitted and applied to the upper end of the outer case 1 from above. In this state, the connecting fitting 10 attached to the bottom of the inner container 2 by welding or the like, the heat shield plate 20 attached to the connecting fitting 10 by welding or screwing, and the heat shield plate 20 and the outer case 1 The inner container 2 and the outer case 1 are connected via a screw or the like connecting the bottom.
By this connection, the exterior case 1 and the inner container 2 are attracted to the shoulder member 3, and the shoulder member 3 is sandwiched between the two, so that the whole is integrated and the container body 4 is formed.

An opening 5 at the upper end communicating with the inner container 2 of the container 4 is formed by the shoulder member 3, and the opening 5 of the container 4 is connected to a rear portion of the opening 5 by a hinge pin 50 so as to be opened and closed. Is provided. When the lid 6 is closed, the locking member 8 acted by the spring 7 causes the locking portion 109 of a part of the shoulder member 3 to be engaged.
And is automatically locked in the closed state. The lock by the lock member 8 is performed by the lever 9a of the lock release cam 9.
Can be released by the operation of the lever 9 following the release.
The lid 6 can be opened by pulling up a. The lever 9a is supported by the lid 6 so that the front position can be rotated by the shaft 9b. The lock can be released or the initial operation can be performed by pressing the front end 9b1 with a thumb, for example, and the rear end pushed up by this By pulling up 9b2 with another appropriate finger such as the index finger or the middle finger, the lid 6 can be opened when the lock release is not complete, including the final operation.

A heater 11 is applied to the bottom of the inner container 2 so as to heat the content liquid in the inner container 2 so as to perform water heating and heat retention. However, various operation modes such as a descaling mode for maintaining boiling are also provided. A discharge path 12 is connected to the bottom of the inner container 2, and has a discharge port 12 a in a beak-shaped protruding portion 13 that rises between the inner container 2 and the outer case 1 and protrudes forward formed by the shoulder member 3. The distal end is bent downward so that the content liquid is discharged to the outside at a position in front of the front part of the container 4 through an opening 14 at the bottom of the protruding portion 13. The discharge of the content liquid is performed by the operation of a pumping type electric pump 15 provided at a position lower than the bottom of the inner container 2 in the middle of the discharge path 12. Needless to say, the content liquid can be pressurized by a manual pump or an electric pump and discharged through the discharge path 12.

In the lid 6, a steam passage 16 for releasing the steam generated in the inner container 2 to the outside, and a water stop valve 60 for preventing the contents liquid from flowing out through the steam passage 16 when the container 4 is overturned. Is provided. The innermost surface of the lid 6 is formed by a metal inner lid 17, and the inner lid 17 closes the opening 18 at the upper end of the inner container 2 with a seal packing 19 interposed therebetween with good security.

On the upper surface of the projecting portion 13 of the shoulder member 3, an operation panel 21 for performing various operation modes and discharge operations is provided. Near the upper portion of the discharge passage 12, the discharge passage 12 is provided when the body 4 falls down. Is closed to prevent the contents liquid from flowing out through the discharge path 12, and the water stop valve 22 at the time of overturning, and the contents liquid when the body 4 is at a predetermined angle, specifically, in a substantially full state, Close the discharge path 12 when tilted forward beyond the angle at which it naturally flows out through the discharge path 12 due to the inclination to the front,
A forward tilt stop valve 22a for preventing the content liquid from flowing out through the discharge path is provided in parallel. A bottom cover 34 is attached to the opening 23 at the bottom of the outer case 1 from below, and a rotary seat 35 is sandwiched between the bottom of the outer case 1 and the bottom cover 34 so that the container 4 can be rotated. Support.

Under the bottom of the inner container 2, there are provided various components such as an electronic circuit board 37 for controlling various operations, a heater 11, an electric pump 15, a buzzer 55, and various display portions 54 on an operation board 53. A space 36 for accommodating a power supply circuit for driving with a required voltage is formed, or a circuit box (not shown) is provided. A temperature sensor 38 is applied to the bottom of the inner container 2 to provide temperature information for operation control by the electronic circuit board 37. Electronic circuit board 37
Is mounted on it, for example, a microcomputer 56
Various operation controls are performed by the internal function of. However, such control means is not limited to software control by the microcomputer 56, and various control circuits for performing hardware control can also be used.

The rising portion of the discharge path 12 is
More specifically, since the liquid level becomes the same as the liquid content in the inner container 2, this is used as a liquid amount detecting pipe 12b, and six photocouplers 41a to 41a around which a predetermined liquid level is detected.
A liquid amount detection unit 41 provided with 1f is provided. The detected liquid level is displayed on a transparent window 42 provided at the front of the container 4 for displaying the liquid amount. As shown in Fig. 2, the liquid level is indicated in six stages, the bottom is the level of the water supply that requires water supply, and the interruption is 3.3L.
And the top is the full liquid level, and is indicated by the lamps 42a to 42f, specifically, the LEDs 42a to 42f. However, it is preferable to electrically detect the liquid amount for such a liquid amount display, and there are other methods such as a capacitance method and an electrode method.

The display section 54 is provided on the operation board 53.
In addition, keys necessary for setting various modes, such as a discharge key 57, a descaling key 58, and a warming key 59 for selecting a warming temperature, a room temperature sensor 62, and the like are mounted. These and the temperature sensor 38 are connected to the microcomputer 56. Have been. Further, a heat insulating material 101 is provided around the outer periphery of the inner container 2, and the rib 1a of the outer case 1 and the shoulder member 3 are provided.
And hold it vertically.

In the present embodiment, the power consumption of the heater 11 is reduced stepwise after the temperature sensor 38 detects that the content liquid has reached a predetermined temperature near the boiling point in the water heating mode in which the content liquid is heated. A range in which the vaporization in the liquid becomes active and a large amount of high-temperature steam is generated vigorously and does not reach the normal boiling state. The internal function of the microcomputer 56 is controlled as control means so that the predetermined boiling state is obtained.

As described above, when the temperature sensor 38 detects a predetermined temperature near the boiling point in the water heater mode, the microcomputer 56 controls the power supply so as to gradually reduce the power consumption of the heater 11. For a temperature that leads to normal boiling at which vaporization in the liquid is activated and a large amount of high-temperature steam is generated vigorously, for example, a temperature exceeding 100 ° C. under atmospheric pressure, for example, the temperature on the high side detected by the temperature sensor 38 By setting the temperature near the boiling point, which is reduced by an error range of + several degrees Celsius, the heater 11 is energized so as to have the maximum power consumption and the content liquid is quickly brought to the predetermined temperature near the boiling point. While standing up, it is possible to guarantee that the content liquid has not yet come to a boil when a predetermined temperature is detected.

Thereafter, the power consumption of the heater 11 is reduced stepwise to prevent the liquid content from reaching the normal boiling state due to the continued energizing state at the high power consumption. However, it is possible to achieve a desired boiling state close to and continue to a predetermined boiling state by heating with reduced power consumption of the heater 11 thereafter, as necessary.

The error range of the temperature detected by the temperature sensor 38 is empirically about 2 ° C. or more. Therefore, considering the margin of the maximum error range on the + side as + 4 ° C., the predetermined temperature is 96 ° C. ± 3 ° C. Based on this, when the energization is controlled as shown in FIG. It can correspond to almost the whole. Here, in accordance with the detection error of the temperature sensor 38, the closer the predetermined temperature is to the boiling temperature, the shorter the time required to reach the predetermined boiling state can be shortened.

The number of stages for reducing the power consumption of the heater 11 is shown in FIG.
When there are two or more as in the control shown in (2), the content liquid reaches normal boiling while the content liquid approaches a predetermined boiling state earlier by energizing at the upper limit power consumption allowed at each time. Can be prevented, and such an advantage increases as the number of stages increases.

After reducing the power consumption of the heater 11 when the temperature reaches a predetermined temperature near the boiling point, if the power consumption is reduced at each set point based on the predetermined temperature or elapsed time, the allowable consumption at that time is reduced. The upper limit value of the power can be set accurately without excess or shortage. In the control shown in FIG. 4, when the temperature sensor 38 detects that the content liquid has reached a predetermined temperature, the power consumption of the heater 11 is reduced to, for example, 1%.
After the temperature is lowered from 000 W to 500 W by one step and the temperature information from the temperature sensor 38 detects that the content liquid has reached a predetermined boiling state, the power consumption of the heater 11 is reduced to, for example, 50%.
Control is performed to further lower the power by one step from 0 W to 250 W.

As a result, the content liquid becomes 1 as shown in FIG.
After reaching the predetermined temperature of 96 ° C. ± 3 ° C. by energizing the heater 11 at the maximum power consumption of 000 W, the gradient of the temperature rise characteristic is slightly suppressed by energizing the heater 11 at the power consumption of 500 W.
It is possible to surely bring the content liquid to a predetermined boiling state of approximately 100 ° C. and bring it to the predetermined boiling state without causing normal boiling exceeding 00 ° C.

When the temperature sensor 38 detects a predetermined boiling state, there is a temperature error of about ± 2 ° C. in the detected temperature, and the content liquid has not actually reached the boiling point or has already reached the boiling point. However, even if the content liquid has already boiled at this point, the content liquid will be approximately 102 ° C. at a maximum of 96 ° C. within a predetermined temperature range of 96 ° C. ± 3 ° C. from the error range of the temperature sensor 38. Even in the boiling state, the temperature is low, and from this point on, 250
Since it switches to energization of the heater 11 with power consumption of W,
There is no further temperature rise due to the overshoot phenomenon of the content liquid temperature, and the power consumption is set so as to keep the content liquid in a predetermined boiling state depending on the energization of the heater 11 with the power consumption of 250 W from here. Almost 10
Since the predetermined boiling state is maintained after lowering the temperature from the boiling state at about 2 ° C. while lowering the temperature, the generation of steam can be suppressed as compared with the case where normal boiling continues.

On the other hand, when the temperature has not reached the boiling point, the actual temperature of the content liquid at the time when, for example, 96 ° C. is taken out of the predetermined temperature 96 ° C. ± 3 ° C. Even if the temperature is 94 ° C. in view of −2 ° C., heating is performed to raise the temperature of the content liquid from 96 ° C. ± 3 ° C. to approximately 100 ° C. at which a predetermined boiling state can be obtained. When the predetermined boiling is detected, it has reached about 98 ° C., and the power consumption 250
By continuing the energization of the heater 11 with W for a certain period of time or more, the content liquid can reliably reach a predetermined boiling state, and depending on the setting of the energization time, the predetermined boiling state can be further maintained. it can.

In particular, the energization of the heater 11 with a power consumption of 250 W is to heat the content liquid so as to keep it in a predetermined boiling state. Even if this operation is performed excessively, the boiling end point is slightly delayed. Instead, a design that ensures that the content liquid is brought to a predetermined boiling state and that it is maintained can be realized as required. The predetermined duration of boiling is effective as 1 to 3 minutes in design.

As in the embodiment shown in FIG. 4 described above, if the power consumption at each stage of lowering the power consumption of the heater 11 is a predetermined power consumption such as the above-mentioned 500 W or 250 W, Whenever a set point such as temperature or elapsed time corresponding to power consumption is satisfied, it can be immediately switched to the appropriate power consumption that has been set in advance, and excessive heating due to power setting deviation or control delay causes normal heating. Boiling can be avoided.

The set point of the power consumption drop in the embodiment of FIG. 4 is set by detecting a predetermined temperature and a predetermined boiling temperature. The continuation of the energization of the heater 11 at the last power consumption of 250 W is performed by setting the time so that the so-called descaling is achieved by the initial boiling without setting a special descaling mode. In the control of the embodiment shown in FIG. 4, after the power supply to the heater 11 at the power consumption of 250 W is continued for a predetermined time, the control is switched to the heat retention mode by notifying the boiling. In the embodiment, the temperature is kept at 98 ° C., but another temperature may be used, or the temperature may be selected according to the use or preference.

FIG. 5 is a flow chart showing an example of such control. When the boiling mode is started, the empty cooking is detected, and when the amount of water is insufficient, the buzzer 55 informs the user of the empty cooking.
Then, the control is terminated. If the amount of water is not insufficient, the control is continued and the heater 11 is energized with power consumption of 1000 W, which is full energization, to start water heating. When the content reaches 93 ° C., the amount of water is detected. Although the amount of water may be determined at any time, it depends on the fact that various devices are performing stable operations at this time. In particular, it is preferable to finely determine the water amount from the temperature rise characteristic detected by the temperature sensor 38 separately from the photocoupler of the liquid amount detection unit 41. A boiling constant for detecting a predetermined boiling state is determined in advance from a temperature rise characteristic detected by the temperature sensor 38 from the detected water amount. Next, when the temperature of the content liquid reaches a predetermined temperature of about 96 ° C. ± 3 ° C. near the boiling point, the W number of the heater 11 is lowered to reduce the power consumption to 500 W. In this state, when a predetermined boiling state is detected based on the temperature detection of the temperature sensor 38, the boiler 55 notifies the boiler of the fact that the predetermined boiling state has been reached. Operate to reduce power consumption to 250W. When three minutes have elapsed in this state, the boiler 55 notifies the boiler that the water heater operation has been completed. In addition, buzzer 5
5 can be distinguished depending on how the buzzer 55 is operated.
It may be performed in combination with various displays using characters or lamps such as 1.

The power supply state for energizing the heater 11 with various power consumptions can be changed by using a power supply circuit corresponding to each of the power supply circuits. It can also be performed by changing the so-called duty ratio in which energization and energization stop are repeated at the time ratio of The repetition of energization and energization stop at the duty ratio excludes those at intervals where the temperature of the heater 11 changes to a pulsating state.

When the energization control is performed so as to reduce the power consumption of the heater 11 when the content liquid reaches a predetermined temperature, if the energization of the heater 11 is temporarily stopped, the energization control is performed. Thus, when the content liquid is heated at a high rate, the content liquid is prevented from being continuously heated to reach a normal boiling state. Or a predetermined boiling state.

Further, a water heater for heating the content liquid in the water heater mode, and a heat retaining heater for heating the content liquid in the heat retention mode, which consumes less power than the water heater, are provided when a predetermined temperature in the water heating mode is reached. If the energization to reduce the power consumption after that is switched from the boiler heater to the insulated heater, the required power consumption is reduced by using the insulated heater with the capacity corresponding to the power consumption. This can be achieved more efficiently than in the case where a water heater having a remarkably large capacity is energized as compared with the case of FIG.

Further, a water heater for heating the content liquid in the water heater mode, and a heat retaining heater for heating the content liquid in the heat retention mode, which consumes less power than the water heater, are provided when the temperature reaches a predetermined temperature in the water heater mode. When the subsequent energization is performed by switching to the energization in the series state of the water heater and the heat retaining heater, the increase in resistance due to the fact that both heaters are switched from parallel to series limits the energization current and reduces power consumption. Since the same heating conditions can be obtained, a complicated operation such as controlling the electric power is not required.

Further, in the water heating mode for performing the water heating, when the temperature sensor 38 detects that the content liquid has reached a predetermined temperature before boiling, the heater 11 is kept for a predetermined time.
After the power supply to the heater 11 is stopped, the heater 11 may be supplied with the maximum power consumption for a predetermined time, and thereafter, the supply of power may be stopped at a predetermined time ratio and the power supply may be repeated to control the power supply so as to obtain a predetermined boiling state. .

According to this, as described above, while the heater 11 is controlled so as to have the maximum power consumption and the content liquid is quickly raised to the predetermined temperature near the boiling point, when the predetermined temperature is detected, Microcomputer 56
After the power supply to the heater 11 is temporarily stopped, the power is supplied at the maximum power consumption for a predetermined time, so that the temperature rise characteristic of the content liquid from the predetermined temperature is temporarily stopped by temporarily stopping the power supply, By immediately and reliably approaching the predetermined boiling state without causing normal boiling due to energization with power consumption, or set to the predetermined boiling state, thereafter, by repeating energization stop and energization at a predetermined time ratio In addition, the apparent power consumption can be freely obtained, and the predetermined boiling state and its continuation can be reliably achieved.

At the final stage of the energization control for obtaining a predetermined boiling state, the control means such as the microcomputer 56, when the content liquid has not reached the predetermined boiling state and the boiling has not been determined yet, causes the heater 11 to consume the maximum amount of water. When the power is supplied for a predetermined time, even if the content liquid may not be boiling due to the influence of the ambient temperature or the like, this is detected and the heater 11 is supplied with the maximum power consumption for a predetermined time. Thus, even if a predetermined boiling state is reliably obtained in a short time, and there is a case where normal boiling occurs in which a large amount of high-temperature steam is rushed, while suppressing this to an extremely short time, there is no boiling. It is possible to prevent the content liquid from being used in the state.

As described above, the microcomputer 56
However, when the predetermined boiling state is obtained, the end of the predetermined boiling or water heating is notified by the notification means such as the buzzer 55, so that the generation of steam is suppressed, and even if this is difficult to be visually recognized outside, Can be used to inform the user that the content liquid has reached a predetermined boiling state or that the water heating has been completed, and that this is a measure of the timing at which the use of the content liquid can be started.

Further, if the apparatus has various liquid amount detecting and judging means and judging functions as described above, the microcomputer 56 or the like can control the heater 11 according to the liquid amount of the content liquid.
When the power consumption when energizing is set, the heating of the content liquid to a predetermined temperature near the boiling and the heating of the content liquid to obtain a predetermined boiling state after reaching the predetermined temperature, It can be achieved without any excess or shortage according to the amount of the liquid, and it is possible to eliminate disadvantages such as taking a long time and usually causing boiling. Further, if the time for maintaining the predetermined boiling is also set in accordance with the amount of liquid, it is possible to prevent the normal amount of boiling due to the small amount of liquid even if the power consumption is kept small.

If a room temperature detecting means such as the room temperature sensor 62 for detecting the room temperature is further provided as described above, the control means such as the microcomputer 56 can more accurately determine the amount of water, It is more preferable to set the power consumption when energizing the heater 11 according to the temperature and the room temperature, or to set the time for maintaining a predetermined boiling state.

[0049]

According to the electric hot water storage container of the present invention, when the temperature sensor detects a predetermined temperature near the boiling point in the water heater mode, the control means reduces the power consumption of the heater stepwise. Since the energization control is performed so that the temperature rises to the normal boiling point where the vaporization in the liquid becomes active and a large amount of high-temperature steam is generated vigorously, for example, in a high error range detected by a temperature sensor By setting the temperature near the boiling point lowered by a certain + several degrees C, the heater is controlled so as to have the maximum power consumption, and the content liquid is quickly raised to the predetermined temperature near the boiling point. Ensure that the content liquid has not yet boiled at the point when the predetermined temperature is detected, and thereafter the power consumption of the heater is reduced in stages, so that the energized state with the previous high power consumption continues. Thus, while preventing the content liquid from reaching a normal boiling state, it is possible to approach the predetermined boiling state by heating with reduced power consumption of the heater thereafter and reliably achieve the predetermined boiling state. It is possible to maintain a predetermined boiling state if necessary.

In particular, when the energization is controlled so as to reduce the power consumption of the heater when the temperature reaches a predetermined temperature, the energization of the heater is temporarily stopped and then performed. When the content liquid is heated at a high rate, the content liquid is prevented from being continuously heated to reach a normal boiling state. A sustained state is obtained.

According to the electric hot water storage container of the second aspect of the invention, while sharing the basic features and functions with the first aspect of the invention, in particular, a water heater and a water heater for heating the content liquid in the water heater mode And a heater for heating the liquid content in the warming mode, which consumes less power than in the warming mode, and switches the energization after reaching a predetermined temperature in the water heater mode to energization in a series state of the water heater and the warming heater. This increases the resistance by switching both heaters from parallel to series, so that the same heating conditions are obtained as the current supply is limited and the power consumption is suppressed. Becomes unnecessary.

According to the electric hot water storage container of the third aspect of the present invention, for example, when the temperature in the liquid reaches normal boiling at which vaporization in the liquid is activated and a large amount of high-temperature steam is generated vigorously,
By setting the temperature near the boiling point lowered by plus several degrees which is the error range on the high side detected by the temperature sensor, the heater is controlled so as to have the maximum power consumption, and the content liquid is heated near the boiling point. At the time when the predetermined temperature is detected, the control means temporarily stops energization to the heater and then energizes at the maximum power consumption for a predetermined time, so that the energization is temporarily stopped. Once the temperature-rise characteristic of the content liquid from the predetermined temperature is once lowered, the boiling state is quickly and reliably brought close to the predetermined boiling state without causing normal boiling by energizing at the maximum power consumption, or the predetermined boiling state. State, and thereafter, by repeating the energization stop and energization at a predetermined time ratio, the apparent power consumption can be freely obtained, and the predetermined boiling state and its continuous state can be reliably obtained. It can be.

According to the electric hot water storage container of the fourth aspect of the present invention, at the final stage of energization control for obtaining a predetermined boiling state while sharing the operation with the basic features of the first aspect of the present invention, the boiler is provided by the notification means. Therefore, even if the generation of steam is suppressed and the boiling state is hardly visually recognized outside, the user can know that the content liquid has reached the predetermined boiling state by the notification, and use the content liquid. It is convenient to use because it is an indication of when to start. Also, at the final stage of energization control for obtaining a predetermined boiling state, if the predetermined boiling state has not been determined yet, the heater is energized at the maximum power consumption for a predetermined time. Even if the liquid has not yet reached boiling, in response to this, the heater is energized for a predetermined time at the maximum power consumption, thereby reliably obtaining a predetermined boiling state in a short time and reporting this, Even if normal boiling, in which a large amount of high-temperature steam is rushed, can be avoided in a very short time, it is possible to prevent the content liquid from being used without boiling.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an electric pot showing an embodiment of the present invention together with an example.

FIG. 2 is a front view of a part of the electric pot of FIG. 1 as viewed in section.

FIG. 3 is a block diagram of a control circuit of the electric pot of FIG. 1;

FIG. 4 is a graph showing a relationship between control of one embodiment of the electric kettle in FIG.

FIG. 5 is a flowchart illustrating an example of control of a water heater mode by the control circuit of FIG. 1;

[Explanation of symbols]

 2 inner container 4 body 11 heater 21 operation panel 37 electronic circuit board 38 temperature sensor 41 liquid level detection unit 55 buzzer 56 microcomputer 62 room temperature sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/21 101 A47J 27/00 109

Claims (4)

(57) [Claims] 1. A temperature sensor for detecting a content of a liquid contained in a container and heated by a heater by a temperature sensor via the container.
In an electric hot water storage container that heats and keeps the content liquid while energizing and controlling the heater based on the detected temperature, the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. After the time when the temperature sensor detects, the heater is provided with control means for controlling the power supply so as to reduce the power consumption of the heater to obtain a predetermined boiling state before the normal boiling at which the vaporization in the liquid becomes active. An electric hot water storage container characterized in that the energization control for lowering the power consumption is performed after the energization of the heater is temporarily stopped. 2. The temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container.
In an electric hot water storage container that heats and keeps the content liquid while energizing and controlling the heater based on the detected temperature, the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. Control means for controlling the energization so as to reduce the power consumption of the heater after the time when the temperature sensor detects, to obtain a predetermined boiling state before normal boiling in which vaporization in the liquid becomes active, and a water heating mode The heater is provided with a water heater for heating the content liquid and a heat retention heater for heating the content liquid in the heat retention mode, which consumes less power than the water heater, and the power supply control for reducing the power consumption of the heater is performed by supplying electricity from the water heater to the water heater. An electric hot water storage container characterized in that the current is switched to energization in a series state of a heat retaining heater. 3. The temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container.
In an electric hot water storage container that heats and keeps the content liquid while energizing and controlling the heater based on the detected temperature, the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. At the time when the temperature sensor detects, the power supply to the heater is stopped for a predetermined time, the heater is supplied with the maximum power consumption for a predetermined time, and then the power supply is stopped at a predetermined time ratio, and the power supply is repeated. An electric hot water storage container comprising control means for controlling power supply so as to obtain a predetermined boiling state before normal boiling at which vaporization is activated. 4. The temperature of the content liquid contained in the container and heated by the heater is detected by a temperature sensor via the container.
In an electric hot water storage container that heats and keeps the content liquid while energizing and controlling the heater based on the detected temperature, the content liquid has reached a predetermined temperature near the boiling point in the water heating mode for performing the water heating. Control means for controlling the power supply so as to reduce the power consumption of the heater after the time when the temperature sensor detects the temperature sensor to obtain a predetermined boiling state before normal boiling in which vaporization in the liquid becomes active, and The control unit includes an informing unit that notifies the outside and a boiling determination unit that determines a predetermined boiling state, and the control unit determines that the boiling determination unit has reached the predetermined boiling state in a final stage of energization control for obtaining the predetermined boiling state. An electric hot water storage container characterized in that when it has not been reached, when the heater has not been reached, the heater is energized at the maximum power consumption for a predetermined time, and then the boiling unit is notified by the notifying means.