JP3574585B2 - Electric hot water storage container - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to various electric hot water storage containers that store hot water while boiling a content liquid.
[0002]
[Prior art]
Nowadays, it is urgently required to save energy, that is, to save energy and use safely in various devices. On the other hand, it is desired to boil the content liquid once and to store the hot water in terms of removal of calcium and odor of the content liquid or sterilization.
[0003]
Therefore, conventionally, when water is heated, it is considered that the content liquid is at least boiled when the power is turned on or when the content liquid is added.
[0004]
[Problems to be solved by the invention]
However, if boiling water is continued as usual until boiling is detected when boiling the content liquid, the temperature of the content liquid will be reduced to the boiling temperature even if the boiling water drive is stopped after the point of boiling. Since a large amount of high-temperature steam is released to the outside immediately before boiling for a while after boiling for a while after boiling, it causes a dangerous feeling or a hot feeling in use, and it is desired to take measures.
[0005]
The applicant has previously proposed a solution to this problem. This is, in the water heater mode, after the time when the temperature sensor detects that the content liquid has reached a predetermined temperature before the normal boiling, the power supply control so as to gradually reduce the power consumption of the heater, The control is performed to obtain a predetermined boiling state before normal boiling at which vaporization in the liquid becomes active. The predetermined temperature is about 96 ° C. ± 3 ° C.
[0006]
According to this, it is possible to prevent the generation of a large amount of high-temperature steam as in the prior art, and to obtain a substantial boiling state of the content liquid. However, according to further experiments, it is sometimes the case that the content liquid does not reach a predetermined boiling state, or reaches a normal boiling state and further overshoots it.
[0007]
After conducting various experiments on this, the heater was found to have a variation in the calorific value due to irregularities in the number of windings and the length, etc., and there was an error in the detection of the predetermined temperature before boiling. This is probably because the time from detection to the predetermined boiling state is too short, or the control of the water heater drive is monotonous, and the control cannot be completed.
[0008]
An object of the present invention is to provide an electric hot water storage container capable of reliably obtaining a boiling state while reliably preventing generation of a large amount of high-temperature steam in various types of water heater driving, including the above case.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the electric hot water storage container of the present invention includes: A heater for heating the content liquid, a temperature detecting means for detecting the temperature of the content liquid, and storing the boiling point temperature, and discriminating the two types of control method of the heater at the time of the water heater drive from "1" and "0". And a reset operation key for resetting the boiling point flag to "0", the control means comprising: When the flag is "0", the heater is driven to heat until the content liquid boils, and when the temperature detecting means detects the boiling state, the heating of the heater is stopped, and the detected temperature at the time of boiling is defined as the boiling point temperature. At the same time, the boiling point flag is set to "1". During the subsequent water heating operation, when the boiling point flag is "1", the heating of the heater is stopped when the content liquid reaches the stored boiling point temperature, and Set the boiling point flag to "1" Is configured to maintain the That One Features.
[0010]
In such a configuration, the initial boiling of the content liquid and the additional boiling are performed, but when the content liquid boils. temperature To stop boiling and detect the boiling point at that time temperature Remember boiling point Flag Set it to "1" And later The boiling point flag is not reset to "0" but "1" While Said boiling point temperature Boiling point stored in the liquid without detection temperature To used With simple control Steamless water heater that does not exceed the boiling point temperature Drive Without spending too much time Can be reliably achieved.
[0011]
The detected boiling point temperature Environment changes that change Boiling point by reset operation key Reset flag By doing , Said boiling point temperature Perform detection Kettle So that the drive takes place Because In addition, even if there is an environmental change such as a change in boiling point, it can be dealt with.
[0012] delete
[0013] Delete
[0014]
The electric hot water storage container according to the present invention further includes two types of control methods, a heater for heating the content liquid, a temperature detecting means for detecting the temperature of the content liquid, and a boiling point temperature. Control means for storing any one of the boiling point flags "1" and "0" that are determined and indicated by "1" and "0"; and a reset operation key for resetting the boiling point flag to "0". When the boiling point flag is "0", the control means heats the heater until the content liquid boils, and stops heating the heater when the temperature detecting means detects the boiling state. The temperature detected at the time of boiling is stored as the boiling point temperature, the boiling point flag is set to "1", and when the water heater is driven thereafter, when the boiling point flag is "1", the content liquid is stored at a temperature higher than the stored boiling point temperature. Low prescribed near boiling temperature When the temperature reaches the predetermined temperature, the power of the heater is driven at the first power consumption reduced from the initial value, and the content liquid reaches a predetermined boiling temperature higher than the temperature near the boiling point and lower than the boiling point temperature. After driving the heater for a predetermined time with the second power consumption which is further reduced than the first power consumption, the heating is stopped and the boiling point flag is maintained at "1". That another Features.
[0015]
In such a configuration, in addition to the case of the above one feature, the content liquid is further stored. The boiling point When the temperature reaches a predetermined near-boiling temperature before reaching the temperature, and reaches the nearest boiling temperature higher than the near-boiling temperature and lower than the boiling temperature At times Since the power consumption of the heater is sequentially switched to the first and second power consumptions which are reduced by a predetermined degree in two stages, and the control corresponding to each time point is performed, the temperature at the time near the boiling point becomes relatively early. In accordance with the first power consumption, the water heater is driven by the first power consumption which is reduced by one step, and gradually approaches the boiling temperature to the temperature just near the boiling point along with the set temperature rising gradient, while securing the temperature rising gradient corresponding to the first power consumption. Predetermined to the temperature near the boiling point time At this point, and from the temperature just before the boiling, the water heater is driven by the lower second power consumption which is reduced by two steps corresponding to this time. Predetermined to a boiling state by securing a heating gradient that matches the power consumption of 2. time Point, the content liquid can be brought to a boiling state without excess or shortage, and the temperature of the content liquid For the boiling point temperature A large amount of high-temperature steam due to overshoot can be reliably prevented. In addition, since the content liquid can be brought to a state close to boiling without boiling for a relatively long time, it is effective for removal of scale and odor and sterilization.
[0016]
In particular, at the time of switching from the heating with the first power consumption to the heating with the second power consumption, and at the time of the end of the heating with the second power consumption, the content liquid is brought to a predetermined near boiling temperature. By setting the timing and time in a relatively stable temperature rising state after the temperature has reached, it is possible to accurately set the temperature without being affected by variations in the temperature detected by the temperature sensor, and to reduce the first and second power consumption. Is easily achieved by the time ratio of energization at the initial value of the heater and energization stop, and a predetermined temperature gradient that gradually approaches boiling can be secured by temporary energization with high power consumption.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, some embodiments of the present invention will be described. Reference example And FIG. 1 to FIG. 9 for the understanding of the present invention.
[0018]
Each of the embodiments is an example of the case of a household electric pot. As shown in FIG. 1, the electric pot of each embodiment accommodates an inner case 2 made of a metal such as stainless steel in an outer case 1 made of a synthetic resin and a shoulder case 3 made of a synthetic resin. At the same time as forming the container body 4 by connecting with the container body 4, an opening 5 at the upper end communicating with the inner container 2 of the container body 4 is formed. An opening 5 of the container 4 is provided at its rear with a lid 6 hinged so as to be openable and closable, and when closed, a locking member 8 operated by a spring 7 is elastically attached to a part of the locking portion 3 a of the shoulder member 3. Engaged and automatically locked in the closed state. The lock by the lock member 8 can be released by operating the lever 9a of the lock release cam 9, and the lid 6 can be opened by lifting the lever 9a following the release.
[0019]
A heater 11 is applied to the bottom of the inner container 2 so as to heat the content liquid stored in the inner container 2 to perform water heating and heat retention. However, various operation modes such as a descaling mode for maintaining boiling are provided. A content liquid discharge passage 12 is connected to the bottom of the inner container 2 and rises between the inner container 2 and the outer case 1 to bend downward in a forwardly protruding beak-shaped protrusion 13 formed by the shoulder member 3. Then, the content liquid is discharged to the outside at the front front position of the container 4 through the opening 14 at the bottom of the protrusion 13. The discharge of the content liquid is performed by the operation of a pumping-type electric pump 15 such as a centrifugal pump provided at a position lower than the bottom of the inner container 2 in the middle of the content liquid discharge path 12. However, it is also possible to pressurize the content liquid with a manual pump or an electric pump and discharge it through the content liquid discharge passage 12.
[0020]
In the lid 6, a steam passage 16 for releasing the steam generated in the inner vessel 2 to the outside and a water stop valve 10 for preventing the content liquid from flowing out through the steam passage 16 when the vessel 4 is overturned are provided. ing. A metal inner lid 17 is provided on the innermost surface of the lid 6, 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.
[0021]
An operation panel 21 for performing various operation modes, discharge operations, and the like is provided on the upper surface of the protruding portion 13 of the shoulder member 3. A water stop valve 22a for preventing the contents liquid from flowing out through the container 12; and closing when the body 4 is inclined by a predetermined amount toward the front to prevent the contents liquid from flowing out through the contents liquid discharge passage 12. The water stop valve 22b at the time of leaning forward is provided. 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. Below the bottom of the inner container 2, there is provided a circuit box 36 integrally molded or attached to a member forming the bottom of the container body 4, such as a part of the opening 23 of the outer case 1 and a bottom lid 34, and A control board 37 for performing operation control is accommodated. A temperature sensor 38 is applied to the bottom of the inner container 2 to provide temperature information for operation control by the control board 37.
[0022]
Since the rising portion of the content liquid discharge passage 12 has the same liquid level as that of the liquid stored in the container 4, more specifically, the liquid stored in the inner container 2, this is used as a liquid amount detection pipe 12 a and a predetermined amount is provided therearound. A liquid amount detection unit 41 provided with six photocouplers 41a to 41d for detecting a liquid level is provided. The detected liquid level is displayed on a transparent window (not shown) for displaying the liquid amount provided in the front part of the container 4. However, it is also preferable to electrically detect the liquid amount for such liquid amount display, which is determined by the temperature rise characteristic ΔT / Δt or the temperature decrease characteristic of the content liquid as shown in FIG. There are other methods such as a method, a capacitance method, and an electrode method.
[0023]
As an example, as shown in FIG. 2, the operation panel 21 is not suitable for the use of the re-boiling mode for re-boiling the content liquid which has been normally kept warm after boiling, descaling at the time of boiling, and the use of the content liquid. A so-called rest timer mode in which after the energy-saving warming at a temperature lower than the case of the low-temperature warming that can be relatively quickly raised up to a temperature suitable for the temperature, the heater 11 drives the heater 11 to the normal warming state at a set time, Is set to a rotary type, and the display lamps 51a to 51c corresponding to each mode, and the normal heat drive by the normal heat drive of the heater 11 after the water heating, the high temperature heat of 98 ° C., 90 Insulation selection key 52 to choose between saving in ℃, keeping low temperature at 60 ° C for gyokuro or baby milk etc. Corresponding display lamps 52a to 52c, a hot water supply key 53 for pouring out hot water by supplying a liquid content, and a hot water supply lock / unlock key 54 for stopping operation of the hot water supply key 53 to prevent hot water supply. A display lamp 54a for displaying whether the hot water supply is locked or not depending on whether or not the content liquid is discharged by turning on and off, and a required time for regenerating instant foods for supplying hot water so that the food can be regenerated and eaten, and the set time elapses A so-called cup noodle timer key 55 that is notified later by a buzzer or the like is provided.
[0024]
( Reference Example 1 )
Book Reference Example 1 Is used to heat the content liquid in the inner container 2 in various modes set by the heater 11 to boil water, and to pour out and supply hot water at any time by the operation of the electric pump 15 according to the hot water supply operation required by the hot water supply key 53. Used for various applications. In such use, when the content liquid reaches a predetermined near-boiling temperature before the liquid reaches boiling, the power consumption of the heater 11 is switched to a near-boiling drive mode with a first power consumption that is reduced from an initial value, The boiling drive mode with the second power consumption further reduced than the first power consumption, at a timing when the content liquid reaches a predetermined near-boiling temperature higher than the near-boiling temperature and lower than the boiling temperature or corresponding thereto. And the boiling drive mode is terminated at a timing corresponding to the boiling of the content liquid or at a timing corresponding thereto.
[0025]
in this way Reference Example 1 In this case, when the content liquid reaches a predetermined near-boiling temperature before boiling before the time when the content liquid reaches boiling or a timing corresponding thereto, the most recent boiling near the boiling temperature higher than the near boiling temperature and lower than the boiling temperature. At two set points, that is, when the temperature is reached or when the corresponding timing is reached, the power consumption of the heater is sequentially switched to first and second power consumptions, which are reduced by a predetermined degree, in two stages. Control corresponding to. Thereby, from the relatively early stage of the temperature near the boiling point to the temperature just before the boiling point by the water heater driven by the first power consumption reduced by one stage corresponding to this time from the relatively early stage, while gradually approaching the set temperature rising gradient. The temperature near the boiling point, for example, 99.degree. C. is almost certainly reached at a predetermined timing by securing the temperature rising gradient commensurate with the first power consumption, and the temperature immediately after the boiling point is lowered by two steps corresponding to this point. By the water heater drive by the second power consumption, the boiling state is almost surely reached at a predetermined timing at a predetermined timing while securing the temperature rise gradient corresponding to the second power consumption while gradually approaching the set temperature rise gradient. Can be.
[0026]
Therefore, the content liquid can be brought into a boiling state without excess or shortage, and the generation of a large amount of high-temperature steam due to the overshoot of the temperature of the content liquid can be reliably prevented. In addition, since the content liquid can be brought to a state close to boiling without boiling for a relatively long time, it is effective for removal of scale and odor and sterilization.
[0027]
From the viewpoint of such a sufficient boiling operation, the temperature near the boiling point is preferably about 93 to 96 ° C. The first power consumption is 70% or more per unit time with respect to the initial value, and the second power consumption is 30 to 70% per unit time with respect to the initial value. % Is enough. However, it is not necessarily limited to this.
[0028]
The temperature immediately near the boiling point and the boiling point can be reliably determined from the gradually changing temperature change without a problem of overshoot by detecting the temperature with the temperature sensor 38 or the like. Changes in detected temperature at boiling point ΔT , That is, a predetermined time or more in the water heater drive ΔT Can be determined by being 0 or a value close to it, which does not change. This means that it is possible to cope with the difference in boiling point in regions with different atmospheric pressures, and in highlands where the normal boiling temperature has not reached 100 ° C. In the case of boiling, there is an advantage that it is possible to prevent the useless water heater drive and generation of steam thereafter. For example, temperature changes measured 16 times at 4 msec intervals ΔT Is zero or less than or equal to a predetermined value, the boiling point can be detected as no temperature change, and this can be achieved without spending too much time just before boiling.
[0029]
In addition, since the timing of reaching the nearest boiling temperature, for example, 99 ° C., is substantially constant in the near-boiling drive from the near-boiling temperature, for example, 96 ° C., it may be set by the duration of the near-boiling drive mode, The predetermined boiling point temperature can be almost accurately determined without an error as in the case of temperature detection. Furthermore, since the timing of reaching boiling is substantially constant in the boiling drive from the temperature near the boiling point, this may also be set according to the duration of the boiling drive mode, without any error as in the case of temperature detection. The predetermined boiling point can be determined almost exactly. It is preferable that the duration of the boiling drive mode is about 30 msec to 1 min from the viewpoint of control stability.
[0030]
If the duration is set in accordance with the amount of the content liquid, it is possible to determine a predetermined temperature point or state point without any deviation. In order to further optimize this determination, it is effective to detect and consider an environmental temperature such as room temperature.
[0031]
In the near-boiling drive mode and the boiling drive mode, when the continuous energization in the water heater drive at the initial value of the heater is performed intermittently at predetermined intervals, the reduction ratio of the power consumption with respect to the initial value is defined as the energization time and the energization stop time. While easily being achieved by setting the ratio, a predetermined temperature rising gradient that gradually approaches boiling can be secured by temporary energization with high power consumption.
[0032]
The various controls described above involve the transmission and reception of signals between the control board 37 and the operation board 138 provided inside the operation panel 21, and are automatically performed by operation control by a control device such as the CPU 39 on the operation board 37. Is achieved. The power consumption for driving the heater 11 between the water heater drive and the normal heat-retaining drive is made large or small, such as about 1000 W and about 80 W. However, the heater wire for the water heater drive and the heater wire for the normal heat-retention drive are separately provided. They can be used individually or in combination, and the power consumption of one heater wire can be freely set by one or both of the selection of the drive voltage and the duty ratio (the ratio between the drive time and the drive stop time). Can also be set to The above control is also common to obtain various power consumption states necessary for each case.
[0033]
For the steam-less water heater drive that ensures the boiling state while suppressing the generation of steam as described above One control example As shown in FIGS. 3 and 4, the heater 11 is heated at a power consumption of, for example, 1000 W, depending on whether the initial boiling is caused by turning on the power or the additional boiling is caused by the addition of the content liquid during the normal heat retention. Drive. Supplemental boiling can be determined by detecting that the content liquid falls below the normal temperature by more than a predetermined temperature or falls below a predetermined temperature during a predetermined time.
[0034]
Next, when the temperature reaches 96 ° C., which is an example of the temperature near the boiling point, the heater 11 is turned on for a predetermined time t0 at a time interval t1 corresponding to the detected water amount at 1000 W for a predetermined time t3. As a result, the content liquid almost certainly reaches 99 ° C., which is an example of a temperature immediately before boiling, along a predetermined temperature gradient as shown during t3 in FIG. Thereafter, the heater 11 is turned on for a predetermined time t0 at a second time interval t2 according to the amount of water at the same 1000 W for a predetermined time t4. FIG. 4 shows the temperature change of the content liquid in this case. During each of the time intervals t1 and t2, the heater 11 is not completely turned off, but continues to be driven at a power consumption of about 80 W as an example of normal heat retention, and is adjusted so that the temperature of the content liquid does not drop when the water heater is turned off. I am planning. However, the power consumption in each of the first and second stages may be basically performed by any of the above-described methods.
[0035]
In the case of re-boiling during normal heat retention, it is determined whether or not the temperature is below the boiling vicinity temperature in response to the possibility of starting from 60 ° C heat retention. The drive mode is executed as it is. However, if the temperature is not lower than the temperature near the boiling point, the temperature immediately before the boiling point of the content liquid is detected to be 99 ° C., and the control is performed from the temperature immediately before the boiling point of 99 ° C. in the steamless water heater drive mode to take advantage of the advantage of the steamless mode. To achieve reboil.
[0036]
Shown in FIG. Reference Example 2 Above Reference Example 1 When the predetermined water heating operation is completed while the steamless water heating operation control is being performed as described above, if the temperature of the content liquid does not change for a predetermined time, this is regarded as boiling and the heater 11 is turned off. Along with it, the boiling is announced. Thus, in addition to the features of the above-described embodiment, the boiling point can be determined by the change in the detected temperature, that is, by not changing for a predetermined time in the water heater drive. In the case of boiling at a high altitude where the normal boiling temperature does not reach 100 ° C., there is an advantage that it is possible to prevent useless hot water driving and generation of steam thereafter.
[0037]
(Embodiment 1 )
This embodiment 1 Is to heat the content liquid with the heater 11 to boil water and store the hot water. Detected and set boiling point temperature In addition to stopping the water heater driving of the heater 11 when the temperature reaches temperature Once detected, it is set and stored, and is used repeatedly thereafter. As a result, the boiling point temperature When the temperature of the heater 11 is reached, the heating operation of the heater 11 is stopped. temperature Even when the boiling point is low temperature Is stopped after the temperature of the heater 11 has been reached, so that the heating is continued due to the low temperature, and it is possible to prevent the steam from being released during that time, thereby saving energy.
[0038]
Set and stored boiling point temperature Should be able to reset when needed. boiling point temperature Can be easily and reliably determined by the fact that the temperature of the content liquid does not change for a certain period of time during the boiling operation, temperature Is preferably set and stored once detected, and then used repeatedly thereafter.
[0039]
In this case, in order to cope with a change in the boiling point due to a change in the place of use, it is preferable that the set and stored boiling point can be reset when necessary. The reset can be performed by operating a dedicated key, but can be performed by operating a plurality of existing keys as shown in FIG. The plurality of operations may be a plurality of repeated operations on the same key, a simultaneous operation of a plurality of keys, or a continuous operation within a predetermined time interval.
[0040]
In particular, shown in FIG. In a specific example Drives the heater 11 in the initial boiling and the additional boiling, and sets the boiling point flag. "1" Not That is, "0" Boiling point Temperature Perform the detection and the boiling point temperature Is detected, it is stored, the heater 11 is turned off, the water heater is stopped, and the boiling is notified. boiling point Flag "1" Keep it. As a result, in the subsequent hot water drive including re-boiling, boiling point Flag is "1" Accordingly, the heater 11 is switched to a simple control for continuing the water heater driving until the boiling point is detected at the time of the water heater driving operation, and stopping the operation when the boiling point is detected, so that the steam-less operation and the boiling operation can be satisfied.
[0041]
In this case as well, the environment change in which the boiling point changes Is "1" Reset In other words, return to "0" If you boil water, the boiling point temperature Is repeated in the same manner as described above from the control for detecting the boiling point, and it is possible to cope with a change in the boiling point due to a change in the environment.
[0042]
Another shown in FIG. Concrete In the example, steamless water heater drive Way During ~ In the above, it is determined that the temperature of the content liquid does not change for a predetermined time, ,boiling point temperature Is detected once, the water heater is stopped, the temperature near the boiling point is reset to the boiling point of -4 ° C, and the boiling point flag is set. "1" At the same time, and a boiling notification is made to prevent useless boiling operation.
[0043]
This allows the boiling point flag to be set for subsequent initial and additional boiling. "1" Therefore, the steamless water heater is driven without the operation of detecting the boiling point. temperature To -4 ° C, the measured boiling point temperature The steamless water heater drive is performed toward. However, such control of the steamless water heater mode can be omitted.
[0044]
On the other hand, in the re-boiling mode, the water heater driving of the heater 11 is switched to the boiling point. temperature Until the boiling point is detected. temperature Is switched to the simple control for stopping the water heater at the same time as the detection of.
[0045]
( Reference Example 3 )
Book Reference Example 3 In the sleep timer mode, the heater is driven to save energy while keeping the content liquid at the energy-saving warming temperature lower than the normal warming temperature. In the energy-saving heat-maintaining driving state, the water heater is driven so as to bring the content liquid to a boil at a predetermined set time corresponding to the addition of the content liquid.
[0046]
In this manner, in the rest timer mode in which the content liquid is heated to the normal temperature at the set time from the energy-saving heat-maintaining drive state, when the content liquid is added in the energy-saving heat-maintenance drive state, the water heater driving toward the set time is set. Since the content liquid is brought to boiling at the time, it is possible to prevent the content liquid from being mixed and used without being boiled even in a part, while saving energy by the rest timer mode.
[0047]
In this case, the power consumption of the heater 11 is reduced from the initial value when the content liquid reaches a predetermined near-boiling temperature before the temperature rises above the normal warming temperature and reaches boiling. Switching, at a timing corresponding to or at a time corresponding to the predetermined temperature immediately near the boiling point where the content liquid is higher than the boiling point temperature and lower than the boiling temperature, the boiling at the second power consumption that is further reduced from the first power consumption. By switching to the drive mode and ending the boiling drive mode at the timing corresponding to the boiling of the content liquid or at a timing corresponding thereto, the same operation as described above is performed even when re-boiling from the normal heat retention state. Can be demonstrated.
[0048]
In particular, shown in FIG. Concrete example Then, when the sleep timer is set, the heater 11 is driven to save energy and keeps the counter warming for one second, and the temperature is detected and stored every four seconds while the counter is incremented by one each time one second elapses. When the temperature drops below 4 ° C, it is determined that the content liquid has been replenished, and the boiling flag is set. "1" To
[0049]
Then the boiling flag "1" , The kettle flag "1" If it is, "1" If not, a time required for boiling in the water heater drive and a water heater drive start time corresponding to the set time are calculated in accordance with the temperature and the liquid amount. If it is time to start the water heater, start the steamless water heater drive and set the water heater flag. "1" To When the water heater drive ends or the boiling point is reached, the water heater drive is stopped and a boiling notification is made, and both the boiling flag and the water heater flag are set. Reset to "0" I do.
[0050]
On the other hand, the boiling flag is set "1" Otherwise, the kettle flag "1" If it is, "1" If not, the time required to reach the normal warming temperature in the water heater drive and the water heater drive start time corresponding to the set time are calculated according to the temperature and the liquid amount. If it is a water heater start time, the water heater drive for the normal heat retention state is started and the water heater flag is set. "1" To At the end of the water heater drive, the water heater drive is stopped and the normal heat recovery is notified, and both the boiling flag and the water heater flag are set. "0" To
[0051]
The temperature change of the content liquid in the steamless water heating mode in this case is as shown by a broken line in FIG. 9, and the temperature change of the content liquid when starting up to normal heat retention is as shown by a solid line in FIG. It is. In the normal heat retaining state, the heater 11 is heated for a short time with the maximum power consumption when the content liquid is cooled to 10 ° C. or more with respect to the normal heat retaining temperature of 98 ° C. According to this, although the heater 11 is used in common regardless of the capacity of the electric pot, when the electric pot is used in a large-capacity electric pot and in an environment with a low temperature, the above-mentioned large temperature drop occurs. In addition, it is possible to speedily return to the normal heat retaining temperature so as not to cause a problem in use.
[0052]
【The invention's effect】
According to the electric hot water storage container of the present invention, the boiling point when the content liquid boils to perform the initial boiling and the additional boiling of the content liquid temperature To stop boiling and its boiling point temperature Remember Set the boiling point flag to "1" And later boiling point Flag is "1" While Said boiling point temperature Boiling point stored in the liquid without detection Depends on temperature With simple control Do not exceed the boiling point Extra time for steamless boiling drive Without spending Can be reliably achieved.
[0053]
The environmental change such that the detected boiling point changes, boiling point Flag "0" Reset, Said boiling point temperature Is performed, even if there is an environmental change such as a change in the boiling point, it can be handled.
Delete
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the entire structure of a household electric pot used in each embodiment of the present invention.
FIG. 2 is a plan view of an operation panel of the electric pot of FIG. 1;
FIG. 3 is a flowchart showing one embodiment of water heater control of the electric pot of FIG. 1;
FIG. 4 is a graph showing a state of energization of a heater and a corresponding temperature change of a content liquid under the control of FIG. 3;
FIG. 5 is a flowchart showing another embodiment.
FIG. 6 is a flowchart showing one example of the second embodiment of the present invention.
FIG. 7 is a flowchart showing another embodiment.
FIG. 8 is a flowchart showing one example of the third embodiment of the present invention.
FIG. 9 is a graph showing the state of energization of the heater and the corresponding temperature change of the content liquid under the control of FIG. 8;
[Explanation of symbols]
2 inner containers
4 vessels
11 heater
21 Operation panel
37 Control board
38 Operation board
39 CPU

Claims (3)

A heater for heating the content liquid;
Temperature detection means for detecting the temperature of the content liquid,
Control to store the boiling point temperature and to store either one of the boiling point flags "1" and "0" indicating the two types of control method of the heater at the time of the water heater drive by discriminating between "1" and "0". Means,
A reset operation key for resetting the boiling point flag to “0”,
When the boiling point flag is "0", the control means heats the heater until the content liquid boils, and stops heating the heater when the temperature detecting means detects the boiling state. Is stored as the boiling point temperature, the boiling point flag is set to "1", and when the water heater is driven thereafter, when the boiling point flag is "1", the content liquid is brought to the stored boiling point temperature. An electric hot water container configured to stop heating the heater when the temperature reaches the temperature and to maintain the boiling point flag at "1" . A heater for heating the content liquid;
Temperature detection means for detecting the temperature of the content liquid,
Control to store the boiling point temperature and to store either one of the boiling point flags "1" and "0" indicating the two types of control method of the heater at the time of the water heater drive by discriminating between "1" and "0". Means,
A reset operation key for resetting the boiling point flag to “0”,
When the boiling point flag is "0", the control means heats the heater until the content liquid boils, and stops heating the heater when the temperature detecting means detects the boiling state. The temperature detected at the time of boiling is stored as the boiling point temperature, the boiling point flag is set to "1", and when the water heater is driven thereafter, when the boiling point flag is "1", the content liquid is stored at a temperature higher than the stored boiling point temperature. When the temperature reaches a low predetermined near-boiling temperature, the heater is driven with the first power consumption that is lower than the initial value, and the content liquid is higher than the near-boiling temperature and lower than the boiling point temperature. When the temperature near the boiling point is reached, the heater is driven for a predetermined time with the second power consumption which is further reduced from the first power consumption, and then the heating is stopped and the boiling point flag is maintained at "1". And Electric hot water storage vessel, characterized in that. A heater for heating the content liquid;
Temperature detection means for detecting the temperature of the content liquid,
Control to store the boiling point temperature and to store either one of the boiling point flags "1" and "0" indicating the two types of control method of the heater at the time of the water heater drive by discriminating between "1" and "0". Means,
A reset operation key for resetting the boiling point flag to “0”,
When the boiling point flag is "0", the control means heats the heater until the content liquid boils, and stops heating the heater when the temperature detecting means detects the boiling state. The temperature detected at the time of boiling is stored as the boiling point temperature, the boiling point flag is set to "1", and when the water heater is driven thereafter, when the boiling point flag is "1", the content liquid is stored at a temperature higher than the stored boiling point temperature. When the temperature reaches a predetermined low near boiling temperature, the heater is first driven for a predetermined time with the first power consumption reduced from the initial value, and then the second power is further reduced from the first power consumption. An electric hot water storage container configured to stop heating after driving a heater for a predetermined time with power consumption and to maintain a boiling point flag at “1” .

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