JP2006314516A - Electric hot-water storage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote the energy saving by allowing a user to experience the energy-saving heat insulation more easily than the normal heat insulation. <P>SOLUTION: A hot-water storage container has a standard heat-insulation mode to be executed without selection and a selected heat-insulation mode selected to be executed on the control for heating the content liquid in the hot-water storage container to be boiled so that the heated liquid is used under heat-insulation. The hot-water storage container has a control means for such heat-insulation control that the temperature of water below the boiling temperature is not constant in the standard heat-insulation mode, and the average heat-insulation temperature per unit time in the mode is lower than the heat insulation temperature in the selected heat-insulation mode. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric hot water storage container that heats and heats a content liquid and then retains the hot water to store it for use, and is used, for example, in an electric pot for home use.

  Electric pots are widely used in homes, workplaces, cafeterias, etc., and are highly dependent on homes. They are used during normal usage hours, that is, when hot water is poured out due to user lifestyle. In particular, the power is turned on except for replacement of the content liquid, and the temperature is continuously maintained except during start-up during re-boiling operation during use and initial boiling due to replenishment of the content liquid. Is in standard use.

  In addition, although the power consumption is large, the power consumption is comparable to that of a large refrigerator. While this is a problem in terms of energy saving, it is desirable to lower the heat insulation temperature. In order to cope with the longer time, the re-boiling time is extremely shortened depending on whether it is used frequently or not, for example, the high temperature heat retention mode at 98 ° C., and the power consumption can be conspicuously reduced although the re-boiling time is slightly longer. It has become common to provide a low temperature heat retention mode at 90 ° C. so that the user can select and execute one of the heat retention modes in consideration of convenience and energy saving (see, for example, Patent Document 1).

  Patent Document 1 also includes a thermos warming mode with a high energy-saving effect that is used in a thermos state while heating is stopped after boiling in a normal warming mode of 98 ° C. or 90 ° C., and the user selects these warming modes. It is also disclosed that it can be executed.

  Furthermore, Patent Document 1 proposes a control method in which when the thermos warming mode is selected, the hot water is heated when the content liquid temperature falls below a predetermined temperature. Thereby, even if the content liquid temperature falls below the predetermined temperature due to the passage of the heat retention time or the water supply in the thermos heat retention, the heat retention temperature is again raised above the predetermined temperature after a predetermined time.

Other than the above, various energy-saving warming modes have been proposed and implemented, and various adjustments have been made between convenience in use and energy-saving.
Japanese Patent Laid-Open No. 2003-190016

  By the way, according to a survey of the actual use by the inventors, it has been found that the energy-saving warming mode and the thermos warming mode are not so selected by general users with respect to the normal warming mode.

  The thermos warming mode employs a metal vacuum double container as an electric hot water storage container so that the contents can be heated from the outside, while the heater keeps the heater off because of the excellent heat retention by the vacuum double structure. This is an energy-saving and warming mode that is born as a slow cooling rate and is not very inconvenient for the user. However, where the selection rate of the energy-saving warming mode is low, the selection of the thermos warming mode is particularly low.

  This is because the selection of energy-saving warming mode and thermos warming mode in which the user is expected to wait for reboil tends to be avoided, and it is not selected unless the user is too energy-conscious, and energy-saving warming mode, thermos warming mode This seems to be partly due to the tendency not to spread even the use experience in Japan.

  An object of the present invention is to provide an electric hot water storage container based on the above points, in which energy-saving and warming can be experienced more easily than normal heat-keeping, and energy-saving use can be encouraged.

  The electric hot water storage container of the present invention heats the content liquid in the hot water storage container to perform boiling, and in the electric hot water storage container to be used while keeping warm, in control, the standard heat insulation mode to be executed regardless of selection, and selection In the standard heat insulation mode, there is provided a control means for performing heat insulation control in which the hot water temperature is not constant at the boiling temperature or lower and the average heat insulation temperature per unit time is lower than the heat insulation temperature in the selective heat insulation mode. This is the main feature.

  In such a configuration, although the selective heat retention mode is executed according to the user's selection, particularly in the initial stage of use, the user has a strong tendency to use the standard heat mode without special selection. Non-constant heat retention control is executed, and the average heat retention temperature per unit time satisfies the condition that the heat retention temperature in the selected heat retention mode is actually less than the average heat retention temperature per unit time, which is a slight variation in temperature. In addition, heat retention with less power consumption than the power consumption in the selected heat retention mode is performed with high probability. Moreover, when there is a return to a high temperature including the boiling temperature in the middle, the user wants to use the content liquid at a high temperature unspecified according to the height of the return temperature, the frequency of the return frequency, Therefore, it becomes easy to give satisfaction to wanting to use after boiling again in a short time.

In the further configuration, the warming temperature in the selective warming mode is the highest warming temperature among the multiple warming temperatures to be selected in the selective warming mode,
In the standard heat retention mode, heat retention control is performed with lower power consumption than when the selected heat retention mode is executed at least at the highest heat retention temperature.

In the further configuration, the temperature keeping control with a non-constant temperature is a heat keeping control that keeps the temperature decreasing with time without heating or using a hot water storage container having a heat insulating structure.
Consuming by heating with low power consumption that does not reverse this advantage, or by adopting a hot water storage container with heat insulation structure while allowing further temperature reduction over time to reduce power consumption. Without power, the temperature drop rate can be slowed down to meet the user's desire for high temperature use.

In the heat retention control in which the temperature is not constant, in the further configuration, the temperature decrease and the temperature increase are repeated between the upper limit temperature below the boiling temperature and the lower limit temperature lower than the heat retention temperature in the selected heat retention mode.
When the power consumption is within the average temperature in the standard heat retention mode, or about the middle temperature between the upper limit temperature and the lower limit temperature, including the return to a higher temperature including the boiling temperature, the height of the return temperature and the number of return times By setting the lower limit temperature, it is easy to give satisfaction that the user wants to use the content liquid at a high temperature, depending on the frequency of high frequency, and that it wants to re-boil it in a short time. The necessary power consumption can be reduced.

  Here, the lower limit temperature can be set according to the change in the temperature rise and fall conditions including at least the amount of hot water so that the return time to the upper limit temperature is constant, the return from the lower limit temperature to the upper limit temperature. It is possible to prevent the time from varying due to changes in the temperature rising / falling conditions.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

  According to the electric hot water storage container of the present invention, the energy saving warming is performed by performing the energy saving warming in which the average warming temperature per unit time is lower than the warming temperature in the selective warming mode in the standard mode in which the initial setting or the like is not required. It is possible to increase the use probability to facilitate the experience, and when the user feels dissatisfied with the heat retention temperature, the mode can be determined while shifting to the selected heat retention mode and making a comparison.

  Hereinafter, an electric hot water storage container according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 to provide an understanding of the present invention. In addition, the following description and illustration show the specific example of this invention, and do not limit the technical scope of this invention.

  The electric hot water storage container of the present embodiment is an example of an electric pot for home use. As shown in FIG. 1, the content liquid in the hot water storage container 1 is heated by a heater 2 to perform boiling, While using it. Specifically, it is desirable that the hot water storage container 1 has a heat insulating structure from the viewpoint of heat insulation, and a stainless steel vacuum double container is employed in the present embodiment. The heater 2 is applied to the single bottom 1c where the vacuum space 4 of the hot water storage container 1 is not formed so that the content liquid can be efficiently heated, and hot water is heated and kept warm under the energization control by the control circuit 5. I am doing so. The content liquid can be used by pouring out the hot water storage container 1. However, for convenience of use, the electric pump 6 or the manual pump 7 can be used for pouring through the pouring path 8.

  More specifically, the hot water storage container 1 is accommodated in the outer case 12 to form the container 3, and the heater 2, the electric pump 6, and the pouring path 8 are accommodated between the hot water storage container and the outer case 12. Yes. The outer case 12 is configured such that a synthetic resin bottom member 12a and a synthetic resin shoulder member 12b are connected by a metal body 12c made of a steel plate, a stainless steel plate or the like. A fitting 13 is attached from below to the opening edge 12b1 of the bottom of the shoulder member 12b fitted to the upper end of the body 12c by welding to the shoulder around the mouth 1a of the hot water storage container 1 and screwed. 14 is screwed from above and connected. The bottom member 12a applied to the lower end of the body portion 12c from below is attached to the bottom portion of the hot water storage container 1 by connecting with a connection fitting (not shown). A synthetic resin cover ring 15 is provided covering the opening 1b of the hot water storage container 1 from above the opening edge 12b1 at the bottom of the shoulder member 12b, and screwed from above with a screw (not shown) of the opening edge 12b1 of the shoulder member 12b. It is. Seal packings 16 and 17 are sandwiched and sealed between the cover ring 15 and the shoulder member 12b and the mouth portion 1a of the hot water storage container 1, respectively. A bottom cover 18 made of synthetic resin is fitted into the inspection opening 12a1 of the bottom member 12a so as to be detachable using a plurality of claws 18a provided on the outer periphery, and is screwed with a single screw (not shown), A rotating seat 19 is fitted to the bottom lid 18 so as to be rotatable. The container body 3 is placed on a stationary surface by the rotating seat body 19, and in the stationary state, the container body 3 is reciprocally rotated within a range substantially close to 360 ° to change the direction.

  The pouring path 8 extends laterally from the electric pump 6 connected from below through the portion where the heater 2 is cut out to the single bottom portion 1c of the hot water storage container 1 to the lower part between the body portions of the hot water storage container 1 and the outer case 12. The body part 3 is formed with a shoulder member 12b between the torso and rises to the base of the projecting part 20 to the front end of the upper body 3 and passes through the water stop part 21 at the time of falling or tilting forward located in the projecting part 20. It has a spout 8a that reaches the tip of the overhang 20 and bends downward and protrudes downward. The overhanging portion 20 where the water stop portion 21 and the spout 8a are located is provided in front of the upper end portion of the outer case body 12c and is sandwiched between the overhanging portion 20 and the shoulder member 12b and the outer case body 12c. The lower surface of the overhanging portion 20 is formed from below by the pipe cover 22 that has been made.

  Since the rising portion of the pouring channel 8 maintains the same liquid level as in the hot water storage container 1, a liquid amount display portion 8d formed of a transparent tube is provided, and a liquid amount display window (not shown) provided in the body portion 12c of the outer case 12 is provided. Appearance makes it possible to display the liquid volume externally. Although not shown, the liquid amount display window of the outer case 12 is provided with a scale indicating the remaining amount corresponding to the change in the liquid level indicated by the liquid amount display portion 8d. A flow rate sensor 25 including a screw 25a and a rotation sensor 25b for detecting the rotation of the screw 25a is provided between the liquid amount display portion 8d and the water stop portion 21 of the dispensing channel 8, and the rotation of the screw 25a by the flow rate sensor 25 is provided. By detecting the presence / absence of the liquid and the number of revolutions, it is possible to detect the presence / absence of the content liquid, the flow rate of the content liquid at that time, and the like. A filter 27 made of a metal mesh is attached from above to the outlet 26 of the content liquid to which the electric pump 6 of the hot water storage container 1 is connected so that foreign matter is not poured out together with the content liquid.

  A hollow lid 31 made of synthetic resin is provided at the upper end of the vessel body 3, and a hinge pin 33 at the rear portion of the lid body 31 is detachably attached to a bearing portion 32 provided at the rear portion of the shoulder member 12b. 33 is supported so that it can be opened and closed. The lid 31 in the closed state is fitted with a supply / discharge opening 1d formed by the shoulder member 12b of the container body 3 from above to close the opening 1d, and is made of a metal provided on the lower surface of the cover 31. The inner lid 34 fits into the opening 11d of the hot water storage container 1 continuing to the opening 1d through the cover ring 15, and the seal packing 35 mounted on the outer periphery of the inner lid 34 is pressed against the upper edge 11d1 of the opening 11d of the hot water storage container 1 Thus, the hot water storage container 1 is sealed. The bearing portion 32 has a forward opening portion 32a to which the hinge pin 33 can be attached and detached at a half-open position where the lid body 31 is disengaged from the opening 11d of the hot water storage container 1 and the opening 1d of the vessel body 3. The lid 31 can be attached to and detached from the container 3 by attaching and detaching. The opening portion 32a of the bearing portion 32 is always closed by a stopper 36 having a closing behavior by urging of a spring 36b, and is not opened without a downward movement operation by the operation portion 36a of the stopper 36. 31 inadvertent removal and removal can be eliminated. The stopper 36 does not interfere with the reception of the hinge pin 33 by retraction against the spring 36b, and the lid 31 can be mounted without requiring the operation of the stopper 36. A steam passage 37 for releasing the steam in the hot water storage container 1 to the outside through the lid body 31 is provided with a water stop valve 37c for preventing the content liquid from flowing out through the steam passage 37 when the container body 3 falls, and a water stop valve 37c. If the content liquid still flows out, the accumulating portion 37d is provided to delay the outflow to the outside by accumulating it or detouring it.

  The lid 31 includes a steam passage 37 that discharges steam generated in the hot water storage container 1 to the outside, and a bellows type manual pump 7. The pressure plate 41 is exposed on the upper surface of the lid 31. Each time a pressing operation is performed against the restoring spring 42, air is sent into the hot water storage container 1 to pressurize the content liquid and push it out through the pouring path 8 into the pouring outlet 8a so that it can be poured out from the pouring outlet 8a. The steam passage 37 communicates between the inlet 37a of the inner lid 34 and the outlet 37b on the upper surface of the lid 31 and discharges the steam generated in the hot water storage container 1 to the outside. The manual pump 7 has a switching valve 38 for switching the steam passage 37 from the manual pump 7 to the air supply passage to the hot water storage container 1 in conjunction with the pressing operation by the bias of the spring 39 and returning to the steam passage 37 by restoration. is doing.

  When the lid body 31 is closed at the front part of the lid body 31, the lid body 31 is locked in a closed state by being elastically engaged with a locking portion 411 provided in the opening 1 d of the container body 3 by the bias of the spring 412. A lock member 43 is provided, and when the lock member 43 is moved backward against the spring 412 by operating the operation lever 44 pivotally supported by the shaft 44a at the front portion of the cover body 31, the lock of the cover body 31 to the closed state is released. can do. For example, the operation lever 44 releases the lock when the front end 44b is pushed down with a thumb, and when the tail end 44c that rises at that time is lifted with an index finger or the like, the front part of the unlocked lid 31 is lifted, so the lid 31 is moved back. It can be opened to the final position that is tilted and stable.

  An operation panel 52 as shown in FIG. 2 is provided on the upper surface of the overhanging portion 20 with a seal name plate 51 made of a resin sheet or the like as shown in FIG. On the operation panel 52, for example, as shown in the figure, the hot water supply key 53 for driving the electric pump 6 and the hot water supply key 53 are disabled so that the hot water supply, that is, the pouring cannot be performed, and the hot water supply is released. Lock / release key 54, heat retention selection key 55 for selecting the temperature to be kept after boiling the content liquid, the content liquid to be boiled again during the heat retention, and the time at which the boiling should be terminated and switched to the heat retention is the time required from the present time In addition to re-boil / timer key 56 for setting a reservation and cooking timer key 57 for cooking, a liquid crystal display unit 58 for displaying a set heat retention temperature, a current temperature, etc. with numerals and characters, and hot water lock / unlock display by turning on / off A hot water supply lock lamp 59, a boiling chalk removal mode setting lamp 61, a heat retention lamp 62, and the like are provided. For these operations and display, as shown in FIG. 1, the operation box 52 has an upper wall of the overhanging portion 20 of the shoulder member 12b that is recessed and formed integrally, and the upper opening is sealed by the seal nameplate 51. An operation board 64 is installed in 63. The operation board 64 is equipped with electrical elements such as switches that respond to the operation on the operation panel 52 and a display tool for controlling the display. The inside of the body 3, that is, the bottom of the hot water storage container 1 and the exterior case are mounted. The operation of the electric pot is controlled by cooperating with a power source / control board 65 installed between the bottom portion of 12 and the control circuit 5 such as a microcomputer. As shown in FIG. 3, an operation panel 52 is bidirectionally connected to the control circuit 5, the flow rate sensor 25 and the temperature sensor 101 are connected to the input unit, and the drivers 2 and 71 of the heater 2 and the pump 6 are connected to the output unit. ing.

  The control circuit 5 includes a standard warming mode that is executed regardless of the selection operation of the warming selection key 55 by initial setting or the like for warming control after boiling, and a selective warming mode that is executed by selection. Then, the hot water temperature is not constant at the boiling temperature or lower, and the heat retention control is performed such that the average heat retaining temperature per unit time is lower than the heat retaining temperature in the selected heat retaining mode. As described above, although the warming selection key 55 is provided and the selected warming mode is executed by the user's selection operation, in the initial stage of use, the user has a strong tendency to use the standard mode in which no special selection is made. Warm temperature control in which the hot water temperature is not constant in the heat retention mode is executed, and the average heat retention temperature per unit time satisfies the condition of lower than the heat retention temperature in the selected heat retention mode, that is, it is lower than the power consumption in the selected heat retention mode. Thermal insulation with low power consumption is made with good probability. Moreover, when there is a return to a high temperature including the boiling temperature in the middle, the user wants to use the content liquid at a high temperature unspecified according to the height of the return temperature, the frequency of the return frequency, Therefore, it becomes easy to give satisfaction to wanting to use after boiling again in a short time. As a result, in the standard mode where selection is not required, the average heat retention temperature per unit time is lower than the heat retention temperature in the selected heat retention mode, increasing the use probability in the energy conservation warmth and making it easier for users to experience. When dissatisfied with the heat retention temperature, the mode of use can be determined while shifting to the selected heat retention mode and making a comparison.

  In the present embodiment, as shown in FIG. 4 (a), a high temperature heat retention at 98 ° C. that does not take time for reboiling and a 90 ° C. heat retention that takes some time for reboiling are provided as the selective heat retention mode. (A) (c) When the content liquid is brought to a boiling temperature, for example, 100 ° C. and boiled to a boiling state, as shown in (a), (c), and (d), the heater 2 is turned off, and the temperature is lowered to a selected heat retention temperature of 90 ° C. or 98 ° C. The control circuit 5 controls the energization of the heater 2 so as to maintain the selected heat retention temperature 90 ° C. or 98 ° C. as shown by the one-dot chain line or two-dot chain line in FIG. If this energization control is performed, for example, by controlling the magnitude of the duty ratio, the energization control can be performed simply by changing the ratio between the energization time when the switching element is turned on and the non-energization time when it is turned off. However, it is not limited to this. In FIGS. 4C and 4D, for the sake of simplicity, the average energization capacity is shown by the difference in magnitude in the continuous energization state.

  Here, the warming temperature in the selective warming mode may be the highest warming temperature among a plurality of warming temperatures to be selected in the selective warming mode, that is, 98 ° C. in this embodiment. In the standard heat insulation mode, the heat insulation control is performed with lower power consumption than in the case where the selected heat insulation mode is executed at least at the maximum heat insulation temperature of 98 ° C., and energy is saved by the lower amount. However, in the example shown in FIG. 4, the heat retention temperature in the selected heat retention mode is the minimum heat retention temperature among a plurality of selected heat retention temperatures, that is, 90 ° C., and the heater 2 is turned off after boiling in the standard heat retention mode. Each time the temperature of the liquid reaches 90 ° C. and drops to a lower temperature, for example, 85 ° C., the control of energizing the heater 2 is repeated until the temperature returns to 90 ° C. As a result, the average heat retention temperature in the standard heat retention mode is approximately 87.5 ° C., which is 2.5 ° C. lower than the selected heat retention temperature 90 ° C., and energy saving is maintained accordingly. Further, since the hot water temperature is returned to 90 ° C. every Δt, energy saving heat can be maintained without causing much inconvenience for the user who selects 90 ° C. heat insulation. More specifically, after the boiling, the temperature is lowered to 90 ° C., then lowered to 85 ° C., and returned to 90 ° C. The initial low-temperature main state portion and the subsequent average temperature from 90 ° C. Is energy-saving for 90 ° C insulation.

  In addition, it is preferable to raise the temperature from 85 ° C. to 90 ° C. with the same full energization as when boiling water, because the time required for the startup is shortened and the frequency of return to 90 ° C. can be increased. Here, the return temperature may include a boiling temperature, and the higher the return temperature, the easier it is to fill a gap with the user's high temperature heat retention, and the energy saving heat retention is encouraged and fixed.

  In short, as the heat retention control in which the temperature is not constant, the average heat retention temperature in the selective heat retention mode is repeated by repeatedly lowering and raising the temperature between the upper limit temperature below the boiling temperature and the lower limit temperature less than the heat retention temperature in the selective heat retention mode. By setting the temperature below the heat retention temperature, the power consumption can be reduced to the average temperature in the standard heat retention mode, or the power consumption for the intermediate temperature between the upper limit temperature and the lower limit temperature. It is easy to give satisfaction that the user wants to use the content liquid at a high temperature indefinitely according to the high temperature and the frequency of reversions, and that it wants to use it again in a short time. However, the required power consumption can be reduced by setting the lower limit temperature.

  FIG. 5 shows a specific example of such heat retention control. As for the selection operation by the heat insulation selection key 55, every time the operation is performed, the standard mode, the 90 ° C. heat insulation mode, and the 98 ° C. heat insulation mode are rotated and selected so that the current setting mode is displayed. Initial settings are made so that the standard mode is executed, and each time the heat selection key 55 is operated, the heat retention mode can be switched in the order of 90 ° C heat retention, 98 ° C heat retention and energy saving, and the standard heat retention mode can be selected by further operation. It can be set by. The heat retention mode is started by turning off the heater 2, and in the standard mode, the heater 2 is kept off until a hot water temperature with a lower limit temperature of 85 ° C. is detected, and when the lower limit temperature of 85 ° C. is detected, the heater 2 is turned on. The temperature rise state is maintained until a hot water temperature with an upper limit temperature of 90 ° C. is detected, and when 90 ° C. is detected, the heater 2 is turned off and the process returns. In the 90 ° C. heat retention mode, after the hot water temperature of 90 ° C. is detected, the heater 2 is kept on with the energization capacity that maintains 90 ° C. In the 98 ° C. heat retention mode, after the hot water temperature of 98 ° C. is detected, the heater 2 continues to be turned on with an energization capacity that maintains 98 ° C.

  The lower limit temperature can be set according to changes in the temperature rise and fall conditions including at least the amount of hot water so that the return time to the upper limit temperature is constant, and the return time from the lower limit temperature to the upper limit temperature. Can be prevented from varying due to changes in the temperature rise and fall conditions. Changes in the temperature raising / lowering conditions include changes in the amount of hot water, environmental temperature, atmospheric pressure, etc., and the amount of hot water greatly affects. Therefore, the remaining amount is determined by calculating the total dispensing amount from the total of the liquid amount detected by the flow rate sensor 25 and the dispensing time, and the return time from the determined remaining amount to the upper limit temperature is constant. Therefore, it is possible to set a lower limit temperature at which the time until re-boiling becomes constant. As a result, it becomes possible to always return from the lower limit temperature to the upper limit temperature in a certain time, and even when reboiling is reached, it can always reach in a certain time, and the time to return to the upper limit temperature and reach reboiling is It is possible to prevent occasional variations. For this reason, dissatisfaction with the user's desire to keep the temperature high is eliminated by returning to the upper limit temperature and reaching the reboil longer than usual. However, since the temperature drop characteristics and temperature rise characteristics at that time, for example, the temperature drop temperature range during a predetermined time, or the temperature rise temperature range includes all the temperature rising and falling conditions such as liquid volume, environmental temperature, atmospheric pressure, By setting a lower limit temperature at which the time until the return to the predetermined temperature and the re-boiling at that time is constant from the temperature rise characteristics and temperature fall characteristics at that time, the fluctuation can be further suppressed.

  6 and 7 show specific examples of such standard heat insulation. In this example, when the heat insulation mode is entered, after the heater 2 is turned off, the amount of hot water is determined in three levels: large, medium, and small. Since the determination of the amount of hot water is as small as three steps, it is sufficient to determine the remaining amount by the flow rate sensor 25, and the heat retention temperature at which the upper limit temperature can be returned to 98 ° C. in 5 minutes is shown by diamonds, triangles, and crosses in FIG. So that you set it up from time to time. Specifically, as shown in FIG. 7, when the remaining amount is large, when the hot water temperature 90 ° C. is detected corresponding to the low temperature drop characteristic and the high temperature rise characteristic, a hot water temperature of 90 ° C. or less is detected. The heater 2 is turned on each time, and if it is 90 ° C. or higher, the heater 2 is turned on to maintain the 90 ° C. heat retention so that the return to the selected heat retention temperature of 98 ° C. is achieved in 5 minutes. When the remaining amount is medium, the heater 2 is turned on every time a hot water temperature of 85 ° C. or lower is detected in response to the temperature drop characteristics and the temperature rise characteristics being moderate. By turning it on, the 85 ° C. heat retention is maintained, and the return to the selective heat retention of 98 ° C. is achieved in 5 minutes. Furthermore, when the remaining amount is small, the heater 2 is turned on every time a hot water temperature of 80 ° C. or less is detected in response to high temperature drop characteristics and temperature rise characteristics, and when it is 80 ° C. or more, the heater 2 is turned on. The temperature is maintained at 80 ° C. so that the return to the selected temperature of 98 ° C. is achieved in 5 minutes. Therefore, even in the case of the standard heat retention for energy saving with any remaining amount, the desired heat retention temperature can be restored in 5 minutes after selecting the 98 ° C. heat retention. Even when reaching the re-boiling state, although it takes a longer time, it can be reached in almost the same time.

  Separately, the heat retention control in which the temperature is not constant includes heating as shown in FIG. 4 (e), or on the condition that the hot water storage container 1 having a heat insulating structure as in the present embodiment is adopted as shown in FIG. As shown in FIG. 4 (a), the temperature can continue to drop over time as shown in FIG. 4 (a). As a result, the hot water storage container 1 having a heat insulation structure is adopted by allowing heating with low power consumption that does not reverse this advantage while allowing the temperature to decrease over time and further reducing power consumption. By doing so, the temperature lowering rate can be further slowed down without power consumption, and the user's desire for high temperature use can be met. In thermos warming, it generally takes 2 hours to cool down to 90 ° C. as shown in FIG. 4 (a), and even after 6 hours, the temperature is lowered only to about 60 ° C. By making it difficult for users to experience such dissatisfaction and making it easier for users to experience it, the Kyoto Protocol has issued a strong demand for energy-saving requirements that are now screaming for the future. Implementation can be encouraged.

  In addition, in the warming in the standard warming mode, after the hot water is kept warm for a predetermined time after boiling, for example, the warming temperature is kept at the selected warming temperature, the average warming temperature per unit time is lower than the warming temperature in the selective warming mode. When the temperature is kept, it is possible to cope with a high probability that the content liquid is used immediately or during a short period of time after the power is turned on or when the content liquid is replenished. Also, in the case of the standard warming mode that shifts to thermos warming after boiling, the warming display is performed until the specified temperature during the temperature drop, and after that, the normal warming display is not performed and the reboiling takes a little longer time. If the user is informed of the heat insulation state, it is possible to avoid a heat insulation state that the user cannot recognize. In addition, after the user has selected the selected warming mode, the selected warming mode can be set as the standard warming mode and executed preferentially until the next selection is made. Furthermore, when the situation of not being used for a predetermined time continues, the thermos warming mode can be automatically shifted.

  The present invention can be put into practical use in an electric pot, and can be encouraged by making it easy to experience the use with energy saving and heat retention.

It is sectional drawing which shows one example of the electric pot which concerns on embodiment of this invention. It is a top view which shows the operation panel of the electric pot of FIG. It is a block connection diagram of the control circuit of the electric pot of FIG. It is a graph which shows the relationship between the temperature change in several heat retention control examples after boiling in the electric pot of FIG. 1, and energization control. It is a flowchart which shows the example of control of FIG. 4 concretely. It is a graph which shows the temperature change in the several heat retention control examples after boiling in the electric pot of FIG. It is a flowchart which shows the example of control of FIG. 6 concretely.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage container 2 Heater 3 Body 4 Vacuum space 5 Control circuit 6, 7 Pump 8 Outlet 8a Outlet 12 Outer case 25 Flow rate sensor 52 Operation panel 53 Hot water supply key 55 Insulation selection key 58 Liquid crystal display part

Claims (4)

In an electric hot water storage container that heats the liquid in the hot water storage container and performs boiling,
For control purposes, there is a standard heat insulation mode that is executed regardless of selection, and a selective heat insulation mode that is executed by selection. In the standard heat insulation mode, the hot water temperature is not constant at the boiling temperature or lower, and the average heat insulation temperature per unit time is selected. An electric hot water storage container comprising control means for performing heat insulation control below the heat insulation temperature in the mode. The electric hot water storage container according to claim 1, wherein the heat retention temperature in the selected heat retention mode is a maximum heat retention temperature among a plurality of heat retention temperatures to be selected in the selection heat retention mode. The heat insulation control in which the temperature is not constant is the heat insulation control that keeps the temperature decreasing with time without using heating or using a hot water storage container having a heat insulating structure. The electric hot water storage container according to item 1. The temperature keeping control in which the temperature is not constant means that the temperature lowering and the temperature raising are repeated between an upper limit temperature equal to or higher than the boiling temperature and a lower limit temperature lower than the temperature keeping temperature in the selected temperature keeping mode. The electric hot water storage container described.

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