JPH0614691Y2 - Electric hot water storage container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric hot water storage container used for heating a content liquid with a heater to boil water and keep it at a preset temperature.

(Prior Art) Conventionally, this kind of electric hot water storage container has a warming heater and a boiling heater. When the warming temperature is maintained, only the warming heater is operated to heat with a small capacity heater. Is working to increase the heating capacity. In addition, when the heat retention temperature is set variously during heat retention, various resistances corresponding to the heat retention temperature are selectively operated by the heat retention heater for adjustment.

(Problems to be solved by the invention) When the heaters are used individually or in combination and switched in a timely manner as in the above-described conventional case, ON / OFF control corresponding to the hot water temperature thereof is also added to complicate the hardware circuit configuration. Expensive. Furthermore, if a resistor corresponding to the set temperature is used by connecting it to the heat retention heater during heat retention, the circuit configuration becomes more complicated and this causes a cost increase.

Therefore, the present invention simply controls one heater and
An object is to enable hot water storage operation without being affected by the difference in room temperature and liquid amount.

(Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention comprises a heater for heating the content liquid, and an energization control means for energizing the heater so as to maintain a predetermined heat retention temperature. In an electric hot water storage container provided, a room temperature detecting means for detecting room temperature, a liquid amount detecting means for detecting the liquid amount of the content liquid, and the energization control according to the room temperature and the liquid amount detected by the respective detecting means. A first feature is that an on / off ratio setting means for setting an on / off ratio per unit time in energization by the means is provided.

Further, a room temperature detecting means for detecting the room temperature, a liquid amount detecting means for detecting the liquid amount of the content liquid, and a unit for energization by the energizing control means according to the room temperature and the liquid amount detected by the respective detecting means. A second feature is that an on / off ratio setting means for setting an on / off ratio per time is provided.

(Operation) According to the above configuration of the first feature of the electric hot water storage container of the present invention, in order to keep the content liquid at a predetermined temperature by energizing the heater, a unit time per unit time set according to the room temperature and the liquid amount is set. Since the electricity is supplied according to the on / off ratio, the content liquid can be accurately maintained at the predetermined heat retention temperature without being affected by the difference in the room temperature and the liquid amount.

Further, according to the above-mentioned configuration of the second feature of the electric hot water storage container of the present invention, when the heater is energized to boil the content liquid, it is turned on per unit time set according to the room temperature and the liquid amount,
Since the power is turned on by the off ratio, the content liquid can always be boiled for a fixed time without being affected by the difference in room temperature and liquid amount, and the time until boiling fluctuates, causing confusion and functional anxiety when using the content liquid. It is possible to prevent the person from holding you.

(Embodiment) A first embodiment of the present invention shown in FIGS. 1 to 10 will be described.

In this embodiment, as shown in FIG. 1, the heater 1 is attached to the bottom surface of the bottom of the inner container 2, and a microcomputer (hereinafter, referred to as a microcomputer) 66 controls the energization of the heater 1 to a boiling state and a heat retaining state so that the content liquid is timely. In addition, it can be kept warm by heating it to an appropriate temperature.

The inner container 2 is housed and held in the outer case 3 to form a body 4. The mouth portion 2a of the inner container 2 is connected to the upper end of the outer case 3 by a shoulder member 5 made of synthetic resin, and an outer lid 7 is pivotally attached to a rear hook-shaped bearing 9 of the shoulder member 5 by a shaft 6 so as to be openable, closable and detachable. ing. An inner lid 8 provided on the opening 2a of the inner container 2 is attached to the lower surface of the outer lid 7, and is opened and closed integrally with the outer lid 7.

Inside the outer lid 7, a bellows pump 11 which is pushed by an upper surface pressing plate 10 of the outer lid 7 is provided, and the inner container 2 is provided through an air supply passage 13 provided between the inner lid 8 and the bellows pump bottom plate 12. Pressurized air is sent inside to pressurize the content liquid. The air supply passage 13 is provided with a steam vent passage 15 that leads to the upper surface of the outer lid 7 through a branch hole 14 so that steam generated during heat retention and boiling by the heater 1 is released to the outside.
The inside does not rise abnormally.

The branch hole 14 is switched and closed with the air supply port 16 of the bottom plate 12 of the bellows pump by a valve 36 that is moved downwards in conjunction with the pressing operation of the bellows pump 11, so that pressurized air is discharged from the vapor discharge passage when the content liquid is pressurized. It does not happen that steam escapes to 15 or steam enters the bellows pump 11 when the hot water is stored.

A lead-out path 17 for guiding the pressurized content liquid to the upper outside of the inner container 2 is provided by connecting the base end to the bottom of the inner container 2 so as to communicate with the inner container 2 and the upper end is open to the outside. As a result, the content liquid 42 in the inner container 2 always flows in and maintains the same level. A synthetic resin elbow 20 is connected to the upper end of the lead-out path 17. The elbow 20 is connected to an inverted U-shaped tube 23 fixed to the back side of the beak-shaped portion 5a of the shoulder member 5 which extends to the one side like a beak. The inverted U-shaped tube 23 is an elbow
Immediately above the connection with 20 has a built-in water stop valve 25 at the time of fall,
The downward discharge port 19 of the tip of the inverted U-shaped pipe 23 is formed with a slit 26 on the front side thereof from the lower side to a position higher than the full water position of the inner container 2.

A pipe cover 27 that surrounds the beak-shaped portion 5a is provided below the beak-shaped portion 5a of the body 4, and is fitted to the beak-shaped portion 5a and the outer case 3 of the body 4. At the bottom of the pipe cover 27, a liquid injection guide pipe 24 that receives the liquid discharged from the discharge port 19 of the inverted U-shaped pipe 23 in an open state to the atmosphere and flows downward is detachably attached from below.

The slit 26 is also involved in the reception in the open state to the atmosphere, and surely prevents the siphon, the splash phenomenon, and the spouting of the content liquid in the case of sudden pouring. The liquid injection guide tube 24 is detachably fitted to the beak-shaped portion 5a of the shoulder member 5, receives the liquid discharged from the discharge port 19 with a reasonably large diameter, and thereafter gently squeezes downward while squeezing appropriately. Let it flow down.

The air supply passage 13 is provided with a water stop valve 29 at the time of fall.

The rising part of the outlet path 17 for the content liquid is the liquid level detection part 17b,
It is made of an insulating material. Specifically, glass may be used, but resin has a higher dielectric constant and is more likely to obtain a capacitance change, and it is possible to suppress the indeterminacy of the liquid surface level caused by the rise due to the surface tension around the liquid surface. The liquid level detector 17b is connected to the bottom of the inner container 2 via a straight connecting pipe 17c made of synthetic resin, a curved pipe 17a made of metal, an elbow 17d made of synthetic resin, and a connecting port 17e made of metal.

Here, an aluminum foil 41 is wound around the outer circumference of the liquid level detection unit 17b to form a first electrode, and the bent pipe 17a electrically connected to the content liquid in the liquid level detection unit 17b is used as a second electrode to detect the liquid amount. The sensor S1 forms the first electrode 41 and the second electrode 17a.
The liquid content 42 in the liquid level detector 17b communicating with the liquid level detector 1
They face each other via the insulating peripheral wall of 7b, and the capacitance corresponding to the size of the facing region, that is, the height of the liquid level of the content liquid 42 can be obtained.

The difference in electrostatic capacitance depending on the liquid level is input to a microcomputer (hereinafter referred to as a microcomputer) 66 as an output of the sensor S1 as shown in FIG. As a result, the microcomputer 66 determines the liquid level of the content liquid by the input according to the difference in the electrostatic capacity, and the microcomputer 66 responds to the determination.
External display LEDs 42 ₁ , 42 ₂ ...
42 ₆ drives, are the liquid level so that the external display. In particular, when the liquid level has fallen to the extent that it is necessary to prevent water from being boiled, the light emitting diode 80 for indicating water supply is turned on to prompt water supply. For the determination of the liquid level, it is easy to make a table of the relationship between the capacitance and the liquid level at a necessary stage, and make the determination based on this table.

Emitting diode 42 _{1-42 6} are to be lit and displayed through the display window 44 with the fender panel 43 attached fitted to the front of the outer body 1.

Below these indicators, the boiling indicator lamp 46, 95 ° C, 85
Each of the temperature maintaining display lamps 47a, 47b, 47c at ℃ and 75 ℃, and the water supply display lamp 80 are provided so as to light up through the window 49 of the panel 43, and these are also connected to the microcomputer 66.

On the other hand, the heater 1 is connected to the microcomputer 66 so as to control the duty ratio in a constant energization cycle, and the content liquid can be boiled to boiling by the control, and the content liquid can be kept at the set heat retention temperature. It can be heated and kept warm. The boiling water control and the heat retention control are optimally performed in consideration of the content liquid amount and the room temperature. Therefore, the room temperature sensor S2 is provided on the panel 43 to input the room temperature information to the microcomputer.

Energization in the boiling state is performed at the time of initial heating and when the reboil switch 45 is turned on in the heat retaining state, and is returned to the heat retaining state when the liquid temperature sensor S3 detects the boiling temperature. Therefore, the reboil switch 45 and the liquid temperature sensor S3 are also connected to the microcomputer 66.

Further, the heat insulation temperatures of 95 ° C., 85 ° C. and 75 ° C. can be selectively set by operating the heat insulation selection switch 69 according to the application such as making coffee or tea. Therefore, the heat retention selection switch 69 is also connected to the microcomputer 66.

Operation keys for switches 45 and 69 for reboil and heat retention selection
45a and 69a are provided near the display lamps 46, 47a to 47c and 80. The boiling can be detected by the temperature of the content liquid. A transparent resin cover sheet 48 is applied to the front surface of the panel 43, and an annotation and the like corresponding to various displays are printed on the back surface thereof.

Specific energization control in this embodiment will be described with reference to the graphs of FIGS. 4 to 6 and the flowcharts of FIGS. 7 to 10.

FIGS. 5 and 6 show examples in which the heater 1 is energized at full power until boiling and then energized by changing the duty ratio at a constant energization period, and FIG. 4 shows the contents under various conditions corresponding to that. The change in liquid temperature is shown.

For example, it is now assumed that the energization control shown by the solid line in FIG. 5 can satisfy the heat retention of 95 ° C. after boiling as shown by the line I in FIG. Considering that the content liquid is increased more than in this case, the rate of temperature rise corresponding to the temperature decrease is lower than that in the case of line I, so that the content liquid gradually decreases in temperature as shown by line II in FIG. Go. Therefore, in such a case, in order to keep the content liquid at a predetermined temperature of 90 ° C., the heater energization time at each time of heat retention is set to T _2, which is longer than T _{1 by the amount corresponding} to the temperature increase, as shown in FIG.

On the contrary, considering that the content liquid is smaller than that in the case of line I, the ratio of the temperature rise to the temperature decrease is higher than that in the case of line I, so that the content liquid gradually rises as shown by line III in FIG. Warm up. Therefore, in such a case, as shown by the broken line in FIG. 5, the energization time for each heat retention is set to T ₃ which is shorter than T ₁ by the amount of suppressing the temperature rise.

Considering the case where the room temperature is lower than the case of the line II in FIG. 4, the ratio of the temperature rise to the temperature decrease becomes further lower, so that the content liquid cools more rapidly as shown by the line IV in FIG. Go. Accordingly, in this case set to an amount corresponding long T ₄ further supplement the heating of each round of energization time from T ₂ at the time of insulation as indicated by a broken line in Figure 6.

FIG. 7 shows a main routine for performing such control. When the power is turned on, the initial setting of step # 1 is performed, and in step # 2, it boils and the control subroutine is executed. Then, the heat retention control data fetching subroutine of step # 3 and the heat retention control subroutine of step # 4 are sequentially executed.

The hot water boiling control subroutine is as shown in FIG. 8. Only when the content liquid is initially heated by turning on the power and when the reboiling switch 45 is turned on, the boiling routine starting from step # 13 is entered (step # 11, # 12). In the boiling routine, the heater 1 is turned on with full power until Sen S3 detects boiling. This causes the content liquid to boil in the shortest time.

The heat retention control data fetching subroutine is as shown in FIG. 9, and proceeds to step # 21 and subsequent steps only when it is confirmed in step # 20 that boiling has ended. Step #
In the case of 21, the data t _R detected by the room temperature sensor S2 at that time
Is stored in the memory M1, and in step # 22, the heat retention temperature t _S selected for heat retention at that time is stored in the memory M2. Further, in step # 23, the data Q detected by the water amount sensor S1 at that time is stored in the memory M3, and in the next step # 24, the heat retention control flag is set and then the process returns.

The heat retention control subroutine is as shown in FIG. 10, and proceeds to the next step # 32 only when the heat retention control flag is set in step # 31, that is, when the data for the heat retention control is complete. In step # 32, it is determined whether or not the content liquid temperature detected by the sensor S3 has dropped to a predetermined temperature tβ that requires heating for keeping the temperature, and if it has dropped, step # 32
Continue to 33. In step # 33, the data t _R , t _S , Q
Is read, and in the next step # 34, those data t _R , t
_{From S} , Q and the heater energization time setting table, the appropriate energization time T _o seconds for each predetermined energization cycle of 100 seconds is set. Then, in step # 35, the heater 1 is turned on for T _o seconds each during the 100 second energization cycle.

The table below shows an example of the table.

It should be noted that the time when the temperature is lowered to the predetermined temperature tβ after boiling can be determined by software from the rate of temperature decrease after boiling.

Although the temperature tβ at which the heat retention is started is set in the above-described embodiment, it is also possible to start energization in a constant cycle for the heat retention after boiling without setting the temperature tβ. In this case, even if the energization is performed while the content liquid does not fall to the heat retention temperature, it is only slightly heated, so that the content liquid largely cools down and reaches a predetermined temperature after reaching the heat retention temperature range. The content liquid can be kept in the temperature range of. Then, the energization for this heat retention is controlled according to the room temperature and the content liquid amount as in the above-mentioned embodiment.

In short, in this embodiment, in order to energize the heater 1 to keep the content liquid at a predetermined temperature, energization is performed by the ON / OFF ratio per unit time set according to the room temperature and the liquid amount,
It is possible to accurately maintain the content liquid at a predetermined heat retention temperature without being affected by the difference in room temperature and liquid amount.

Further, as described above, when the heater 1 is energized to boil the content liquid, the energization is performed by the ON / OFF ratio per unit time set according to the room temperature and the liquid amount,
The content liquid can always be boiled for a fixed time without being affected by the difference in room temperature and liquid amount, and the time until boiling fluctuates, causing confusion and functional anxiety when using the content liquid. Can be prevented. To do this, the microcomputer 66 can be used as it is in the configuration of this embodiment, and the calculation function of the microcomputer 66 can be used by using a table or the like for the on / off ratio for boiling water according to the room temperature and the liquid amount. It should be set.

The second embodiment of the present invention shown in FIGS. 11 to 13 is the energizing condition for keeping temperature at a predetermined temperature including the influence of the amount of liquid and room temperature depending on the degree of temperature rise of the content liquid at the time of boiling water. Is shown and the heat retention is executed based on this.

More specifically, under conditions for boiling water (steps # 41, # 42), step # 43 and subsequent steps of the heat retention control data fetching subroutine of FIG. 12 are executed.
In step # 43, it is determined whether or not the predetermined temperature tα has been reached. Only when the predetermined temperature tα has been reached, in step # 44 the temperature increase rate α is calculated based on the temperature detection information of the sensor S3. Predetermined temperature tα
Is a value near the boiling point, for example, 93
℃ Then, as shown in FIG. 11, the temperature rise rate α is calculated from the temperature increase Δt during the constant time ΔT from the predetermined temperature tα. The calculated temperature rise rate α is stored in the memory M4 in the next step # 45 and the process returns.

Next, in the heat retention control subroutine, when boiling is completed and the temperature is lowered to the heating temperature for heat retention (steps # 51, # 5
2), steps # 53 and thereafter are executed. In step # 53, the temperature increase rate α is read, and in step # 54, the current supply rate t _O is set from this temperature increase rate α and the table defining the heater current supply time T _O corresponding thereto. Followed by a thermal insulation in the on and kept setting temperature of 100 sec T _O s increments heater 1 at step # 55.

(Effects of the Invention) According to the first feature of the electric hot water storage container of the present invention, in order to keep the liquid content at a predetermined temperature by energizing the heater, per unit time set according to the room temperature and the liquid amount. Since the current is supplied depending on the on / off ratio, the content liquid can be accurately maintained at the predetermined heat retention temperature without being affected by the difference in the room temperature and the liquid amount.

According to the second feature of the electric hot water storage container of the present invention, when the heater is energized to boil the liquid content, the electricity is supplied at an on / off ratio per unit time set according to the room temperature and the liquid amount. Therefore, the content liquid can always be boiled for a fixed time without being affected by the difference in room temperature and liquid amount,
It is possible to prevent the time until boiling from fluctuating and causing confusion and functional anxiety when using the content liquid.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing the external appearance, FIG. 3 is a block diagram of a control circuit,
FIG. 4 is a graph for explaining the difference in temperature change depending on the liquid amount of the content liquid and room temperature, FIGS. 5 and 6 are graphs showing an energized state according to each condition, FIG. 7 is a flowchart of the main routine, FIG. 8 is a flow chart of a boiling water control subroutine, FIG. 9 is a flow chart of a heat retention control data fetching subroutine, FIG. 10 is a flow chart of a heat retention control subroutine, and FIG. 11 is a control state in the second embodiment of the present invention. A graph shown in FIG. 12, FIG. 12 is a flowchart of a heat retention control data fetching subroutine for the control, and FIG. 13 is a flowchart of the heat retention control subroutine. 1 …… Heater 4 …… Body 66 …… Microcomputer 69a …… Heat retention selection key S1 …… Liquid volume sensor S2 …… Room temperature sensor S3 …… Liquid temperature sensor

Claims (2)

[Scope of utility model registration request] 1. An electric hot water storage container comprising: a heater for heating the content liquid; and an energization control means for energizing the heater so as to maintain a predetermined heat retention temperature. Liquid amount detecting means for detecting the liquid amount of, and on / off for setting the on / off ratio per unit time in the energization by the energizing control means in accordance with the room temperature and the liquid amount detected by the respective detecting means. An electric hot water storage container provided with a ratio setting means. 2. A room temperature detecting means for detecting room temperature in an electric hot water container comprising a heater for heating the content liquid and an energization control means for energizing the heater so as to heat the content liquid until it boils. Liquid amount detecting means for detecting the liquid amount of the content liquid, and ON for setting the ON / OFF ratio per unit time in the energization by the energization control means in accordance with the room temperature and the liquid amount detected by the respective detecting means. And an off-ratio setting means.