JPH084559B2 - Electric hot water storage container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to various electric hot water storage containers such as an electric pot having a mode for boiling the content liquid.

(Prior Art) Conventionally, this kind of electric hot water storage container performs a normal boiling operation and a heat retention operation, and once the content liquid is below the heat retention temperature due to water supply or water replenishment, the content liquid is boiled once by the boiling operation. After that, the content liquid is kept warm at a predetermined temperature after switching to the warming operation.

(Means for Solving the Problem) The present invention provides a boiling operation mode in which the content liquid is boiled by heating the heater when the content liquid is lower than the lower limit temperature during heat retention, and the heater is energized after the boiling operation of the content liquid. Is turned off, and the power is turned on again after a predetermined time, and the boiling state is continued by repeatedly turning off and turning on this heater. The number of times of interruption or energization by this interruption and energization is counted, and when this count reaches a predetermined number, it boils. It is characterized in that it has a boiling state continuation mode for judging that the state has been continued and shifting to the heat retention operation mode.

(Operation) In the boiling operation mode after boiling, the number of times of turning off or energizing the boiling heater to turn on and energize the boiling heater to keep the boiling state for a predetermined time is counted, and the boiling state is continued by this count number. Because you can
No special temperature setting or time setting means for continuing the boiling state is required, and the descaling or the like can be performed while the boiling state is maintained and used.

(Embodiment) A first embodiment of the present invention shown in FIGS. 1 to 7 will be described. An electric container is provided with an inner container 2 having a heater 1 at the bottom in an outer case 3. Forming body 4. The outer case 3 and the inner container 2 are at the upper end by the shoulder member 5, and at the lower end by a connecting fitting (not shown) and a bottom member.
It is integrated by 18. An outer lid 7 is provided on the upper end of the body 4.
Is given. The outer lid 7 is removably pivotally supported by a shaft 6 on a bearing 9 provided at the rear portion of the shoulder member 5, and pivots about the shaft 6 to open and close the body 4.

Inside the outer lid 7, there are provided a bellows pump 11 which is pressed by an upper pressing plate 10 thereof, and a valve 36 which is arranged at the center thereof and which is vertically moved in association with the operation of the pressing plate 10.
The valve 36 is branched from the discharge port 16 of the bellows lower plate 12 and the middle of the air supply path 13 to the inner container 2 communicating with the discharge port 16 and is branched off from the outer lid 7.
Connect the branch hole 14 of the steam vent passage 15 communicating with the outside with the pressing plate.
Interlocks with 10 operations and closes alternately. Since the valve 36 normally closes the discharge port 16 when the pressing plate 10 is returned to the upward direction, the inside of the inner container 2 is in a state of being communicated to the outside by the feeder passage 13, the branch hole 14, and the vapor vent passage 15. The steam generated from the content liquid 42 being boiled or kept warm does not pressurize in the inner container 2 that has escaped to the outside along the route. When the pressing plate 10 is pressed, the valve 36 moves downward to open the discharge port 16 and at the same time close the branch hole 14,
Pressurized air from the bellows pump 11 by the pressing operation enters the inner container 2 through the discharge port 16 and the air supply passage 13 and pressurizes the content liquid. The inner lid 8 is formed with an opening 8a for supplying the air.

An outlet path 17 for guiding the pressurized content liquid to the upper outside of the inner container 2 is provided with its base end connected to the bottom of the inner container 2. (Fig. 1). The outlet path 17 communicates with the inner container 2 and the bottom thereof, rises along the side circumference of the inner container 2, and the upper end thereof is the shoulder member 5 of the container 4 and is directed downward to the outside of the container to the discharge port unit 23 of the content liquid. It is connected and is always open to the atmosphere, and the content liquid in the inner container 2 always spontaneously flows in and maintains the same level as in the inner container 2. The discharge port unit 23 has a built-in water stop valve 25 at the time of fall, and the downward discharge port 19 at the tip of the discharge port unit 23 has a slit reaching the upper surface side from the lower end to a position higher than the full position of the inner container 2. 26 are formed.

A pipe cover 27 surrounding 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 tube 24 that receives the discharge liquid from the discharge port 19 of the discharge port unit 23 to the atmosphere in an open state and causes it to flow downward.
Is attached detachably from below.

The slit is used for receiving in the open state to this atmosphere.
26 is also involved and reliably prevents the siphon, splash phenomenon, and 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 portion of the outlet path 17 for the content liquid serves as a liquid level detecting portion 17b and is made of an insulating material. Specifically, glass may be used, but the resin has a higher melting rate 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. Liquid level detector
17b is connected to the bottom of the inner container 2 through a synthetic resin direct-up connecting pipe 17c, a metal bending pipe 17a, a synthetic resin elbow 17d, and a metal connecting port 17e.

Here, an aluminum foil 41 is wrapped around the outer periphery of the liquid level detection unit 17b to form a first electrode, and the bent tube 17a electrically connected to the content liquid in the liquid level detection unit 17b serves as a second electrode. 1
Electrode 41 and the content liquid 42 in the liquid level detection unit 17b communicating with the second electrode 17a form a capacitance sensor 201 facing each other via the insulating peripheral wall of the liquid level detection unit 17a, and the size of the facing region is large. That is, it is possible to obtain an electrostatic capacity according to the liquid level height of the content liquid 42.

The difference in electrostatic capacity depending on the liquid level is that the sensor 201 is input to the microcomputer 66 of the control circuit 91 as shown in FIG. As a result, the microcomputer 66 judges the liquid level of the content liquid by the input corresponding to the difference in the electrostatic capacity, and the external display LEDs 42 ₁ , 42 connected to the microcomputer 66 via the display circuit B according to the judgment. ₂ ... 42 ₆ drives, there is a liquid level so that the external display. Especially when the liquid level has dropped to the extent that water needs to be supplied to prevent empty cooking, the LED 80
Is lit to encourage water supply. For the determination of the liquid level, it is easy to make a table of the relationship between the electrostatic capacity and the liquid level at a necessary stage and make the determination based on this table. The LEDs 42 _{1 to} 42 ₆ and 80 are provided on the display panel 43 on the entire surface of the body 4.

A display panel 203 is provided on the entire surface of the pipe cover 27. This operation panel 203 has descaling, boiling, and heat-retaining display LEDs 204, 205, 206 and a re-boiling key 21.
1 is also provided.

The microcomputer 66 includes LEDs 80 ₁ , 204 in addition to the LEDs 42 ₁ , 42 ₆ described above.
.About.206 are also connected as the display circuit B, and the key 211 is also connected to the microcomputer 66 as the switch operating section 212.

On the other hand, the heater 1 is divided into a warming heater 1a and a boiling water heater 1b, connected to a heater drive circuit 92, and controlled by relays RY1 and RY2 of a control circuit 91. Therefore, for this purpose, the contacts R-1 and R-2 of the relays RY1 and RY2 are connected to the heaters 1a and 1b as shown in the figure. Heater 1a,
As shown in FIG. 2, 1b is alternately wound around a mica substrate 51, sandwiched between mica plates 52 and 53, and wrapped in a metal case 54 to form one heater 1 in appearance.
The control of relays RY1 and RY2 by 66 can energize any combination.

For this control, the relays RY1 and RY2 are turned on and off by the transistors TR1 and TR2 under the control of the microcomputer 66.

By the way, in the heater 1 of this embodiment,
1a is 60W for control by microcomputer 66, water heater 1b
Is for 740W. In the present embodiment, in order to employ this, when performing boiling or re-boiling shown in FIG. 7, it is heated by the heater 1b, but it is aimed at high-speed boiling.
The capacity of the heater used depends on both heaters 1a and 1b up to about ℃
The temperature is set to 800 W, and when the temperature exceeds 90 ° C. which is a predetermined pre-boiling temperature, the temperature is switched to 740 W by the heater 1b in order to prevent thermal deterioration around the resin of the outer lid 7 and the body 4. In addition, when the temperature is maintained, the heater 1a is set to 60 W to turn on / off the power so that the content liquid is maintained at about 80 ° C.

Energization in the boiling water state is detected by the temperature sensor 68 (Fig. 1). When the liquid temperature is lower than the heat retention temperature and the water is required to be boiled, the maximum boiling key 21
This is performed when 1 is turned on, and when the temperature sensor 68 detects the boiling temperature, it is returned to the heat retention state.

The energization in the heat retention state energizes the heat retention heater 1a when the temperature sensor 68 detects a predetermined heat retention lower limit temperature, and stops the power supply to the heat retention heater 1a when a predetermined heat retention upper limit temperature is detected.
For these controls, the temperature sensor 68 is also connected to the microcomputer 66 via the A / D conversion circuit 202.

Furthermore, in the control of the microcomputer 66, the warming LED 206 and the boiling LED are turned on every time the highest boiling key 211 is turned on in the operation panel 203.
The LEDs 205 and the descaling LED 204 are sequentially turned on individually, and a mode corresponding to the LED that has been turned on for a predetermined time or longer is set and executed. However, when the reboil key 211 is operated again, the operation mode setting can be changed in the same manner as described above.

The heating control of the above content liquid will be specifically described with reference to the flowcharts of the respective subroutines shown in FIGS.

In the heating control subroutine shown in FIG. 4, first, it is judged whether or not the descaling to continue boiling is selected by the boiling continuation key 211 (step # 1). If not selected, the content liquid is below 80 ° C. or the boiling continues. When boiling continues is selected by key 211 (steps # 2, #
Only in step 3), the process proceeds to step # 5 and the boiling operation is performed.
If the descaling by continuous boiling is selected in step # 1, the descaling F (flag) is set to '1' (step # 4), and then the boiling operation subroutine in step # 5 is executed. Relay RY in this boiling mode
1, RY2 is turned on by transistors TR1 and TR2 to turn on relay contacts R-1 and R-2, and heaters 1a and 1b are fully energized until a predetermined pre-boiling temperature close to boiling is reached. It is performed in the capacity energized state. At this time, the high capacity heater capacity is 800 W, and the temperature of the content liquid rises rapidly. After the content liquid reaches the predetermined pre-boiling temperature of 90 ° C, the relay RY1 is turned off by the transistor TR1 and the relay contact R-1 is turned off. Switch to heating.

Although the heater capacity decreases, the temperature rise from 90 ° C. to boiling is relatively fast, and thermal deterioration around the resin of the outer lid 7 and the body 4 due to overheating can be prevented.

When it is determined in step # 6 that boiling has ended, step # 7
Then, it is determined whether or not the descaling removal F that continues boiling is "1". When the boiling operation is started from step # 2 or step # 3, since the descaling F by continuation of boiling is not “1”, the process proceeds to step # 8 and the boiling end operation and the buzzer are performed.
After the notification of boiling by BZ is performed, the operation switches to heat retention. At this time, the relay RY1 is turned on by the transistor TR1, while the relay R2 is turned off by the transistor TR2. This turns on the relay contact R-1,
Since R-2 is off, only the heater 1a is energized. Therefore, the heater 1a alone provides 60 W, and the energization and disconnection are repeated in this state to keep the content liquid in the range of about 80 ° C.

Here, the boiling operation from step # 2 corresponds to the initial boiling (broken line in FIG. 7) due to water supply or water replenishment, but the boiling operation from step # 3 is from the heat retaining operation after boiling and continues boiling (FIG. 7). Reboil).

In step # 7, the removal of scaly that keeps boiling continues with F being "1".
If so, the routine proceeds to step # 10, and the microcomputer 66 controls so that the boiling is continued for 3 minutes. By continuing the boiling, it is possible to sufficiently diffuse the volatile substance such as trihalomethane which is a chlorine compound in the content liquid. Exhibits so-called descaling effect. However, the duration of this boiling can be set appropriately by the user according to the water quality, intended use, preference, etc. Further, since the heating while the boiling is continued is also performed in the state of the heater capacity 740 W by the heater 1b, the resin around the outer lid 7 and the container 4 is not thermally deteriorated even if the boiling continues. It should be noted that the boiling can be continued even after the boiling once, even if the heater has a considerably small capacity.

When boiling continues for a predetermined time, the descaling F is reset to "0" in step # 11 and the process returns to step # 8.

Details of each sub-routine of the boiling operation and the heat retaining operation are shown in the flowcharts of FIGS. 5 and 6.

FIG. 8 and FIG. 9 show a second embodiment of the present invention, in which the current carrying capacity of the heater is reduced in several steps from immediately before boiling to boiling so that higher speed boiling can be ensured and the temperature rise accompanying boiling It is possible to surely prevent adverse effects such as pressure increase and liquid level fluctuation.

FIG. 9 shows changes in the temperature of the content liquid during boiling operation and the energizing capacity of the heater used. The energizing capacity of the heater is set to 800 W until the content liquid reaches 90 ° C, and drops to 600 W when it reaches 95 ° C. If boiling is to be continued and baldness is removed even after boiling is once confirmed, the current carrying capacity of the heater is reduced to 400 W, which is half. After the content liquid has once boiled, even if the heater capacity is made extremely small, the boiling to the extent that the emissive substance is diffused is continued, and the descaling can be achieved.

Note that the heat retention is 60 W as in the case of the above embodiment, but is not limited to this.

Specific control in this case will be described based on the boiling operation subroutine shown in FIG.

When the boiling operation is confirmed (step # 31), the energizing capacity of the heater used is set to 800 W and the boiling operation is performed (step # 3).
2). Next, the boiling operation in step # 32 is repeated until it is determined that the temperature of the content liquid in the boiling operation is 90 ° C or higher (step # 33). When it reaches 90 ℃, the energizing capacity of the heater used is 700W.
At the same time as switching to the boiling water operation described above, the boiling determination process is started. Then, it is judged whether the temperature of the content liquid is 80 ° C or lower (step # 35). If not, it means that the heating toward boiling continues, and in the next step # 36, the content liquid temperature is 95%. Determine if it is above ℃. Otherwise, steps # 34 to # 36 are repeated, and if the temperature reaches 95 ° C or higher, the heater is switched to the boiling water operation with the energizing capacity of 600W (step # 37).

Next, it is judged again whether the temperature of the content liquid is 80 ° C or lower (step # 38), and if not, it means that the heating toward boiling continues and the boiling is judged (step # 39).
Repeat steps # 37 to # 39 until there is. If boiling is judged, it is judged whether or not the scaly removal that continues boiling is selected (step # 40), and if not, the routine returns to the main routine and shifts to the heat retaining operation.

If the descaling by continuous boiling is selected in step # 40, after setting the timer T for 3 minutes, start the subtraction and switch to the continuous boiling operation in which the energizing capacity of the heater used is 400W (step # 41-step # 43), this is repeated until the timer T = 0 is determined, and boiling continues for 3 minutes in a low-capacity energized state.

In steps # 35 and # 38, the content liquid temperature is 80 ° C.
If it is below, it means that the content liquid has dropped to below the heat retention temperature for some reason such as the influence of the outside air temperature even though it is confirmed that it is a boiling operation. Since this has not been achieved, in order to achieve this, the process returns to step # 32, and the boiling operation is repeated from the boiling operation when the energizing capacity of the heater used is 800 W.

FIG. 10 shows a third embodiment of the present invention, in which a microcomputer or the like controls the energizing capacity of a heater to be used steplessly after the content liquid reaches a predetermined pre-boiling temperature, for example, 90 ° C. Is done. However, it is taken into consideration that the energizing capacity of the used heater does not fall below a predetermined W number before the boiling point.
This predetermined W number is the lowest W number that can reliably achieve boiling at an appropriate rate.

FIG. 11 shows a fourth embodiment of the present invention, in which the boiling operation and the heat retaining operation are performed by one heater 1.

The heater 1 is the same as the first embodiment in which the triac 301, which is controlled in conduction by the microcomputer 66 via the transistor TR4, is provided in parallel with the triac 301.
In this embodiment, the energization is controlled by the relay contact R-4 which is turned on / off by a relay (not shown) controlled by the transistor. While the relay contact R-4 is on, the heater 1 is fully energized to perform a boiling operation with a current carrying capacity of, for example, 800 W, and when a predetermined temperature before boiling is reached, the relay contact R-4
Turn off -4. As a result, the triac 301 is activated, and by controlling this with the microcomputer TR6 via the transistor TR4, heating for boiling of the content liquid is performed in a state where the energizing capacity of the used heater is lowered to remove boiling. It is possible to appropriately reduce the energizing capacity of the heater to be used for a predetermined period of time.

Further, even after switching to the heat retention after boiling or removing the descaling, it is possible to control so as to obtain a necessary current-carrying capacity for the heat retention.

FIGS. 12 and 13 show an example of control based on the embodiments of FIGS. 1, 2 and 3. This example is heater 1
Until normal boiling is completed, the energizing capacity is set to 800 W which is a high capacity energizing state by full energization, and when the temperature reaches 90 ° C which is a predetermined pre-boiling temperature, the energizing capacity of the heater 1 is reduced, When the descaling that continues the boiling operation is performed after boiling in the state, the heater 1 is de-energized, and after 10 seconds which is a predetermined time later, it is re-energized for 10 seconds. Thus, the heater 1 is turned on for 10 seconds. By repeating energization and interruption, the energization capacity is halved to 400 W, and energization is controlled so as to maintain the boiling state. The duration of the descaling is determined by counting the number of times the heater 1 is turned off and turned off by energization or energization, and when the count number N reaches a predetermined number 9, that is, after waiting 180 seconds, the boiling state is set. It is determined that the operation has continued, and the process returns to the main routine to shift to the heat retention operation.

FIG. 14 shows a fifth embodiment of the present invention based on the first to fourth embodiments, in which the current-carrying capacity of the heater 1 used for removing scaly is changed according to the amount of the content liquid. is there.

With this, it is possible to prevent the electric power consumption of the heater 1 from being too high when the liquid amount is small and wasteful consumption of electric power, and more vigorous vapor generation of the content liquid than necessary and a large liquid level. You can avoid the danger of shaking.

A specific example of this control will be described. When the descaling to continue boiling is selected, after reaching the predetermined pre-boiling temperature of 90 ° C, the energizing capacity of the heater 1 is reduced and the liquid amount is judged at the pre-boiling temperature stage to start boiling. After completion of the boiling, it is determined that the number is 1 or more after completion of the boiling.
As in the embodiment shown in the figure, energization and interruption of the heater 1 for 10 seconds are repeated 6 times a predetermined number of times to control the energization so as to obtain the boiling state, and the boiling state is continued for 120 seconds. Alternatively, the number of times of energization is counted, and when the number of counts reaches a predetermined number, it is determined that the boiling state is continued, and then the process returns to the main routine to shift to the heat retention.

If the liquid volume is less than 1 after the boiling, the heater 1
After turning off the power for 10 seconds, which is a predetermined time, turn on the power for 5 seconds, and then turn off the power for 10 seconds, repeat the predetermined number of times 8 times to keep the boiling state for 120 seconds,
The number of interruptions or energizations due to this interruption and energization is counted, and when the count reaches a predetermined number, it is determined that the boiling state is continued, and then the process returns to the main routine to shift to heat retention.

(Effects of the Invention) According to the present invention, in the boiling operation mode after boiling, the number of times of shutting off or energizing the hot water heater by shutting off and energizing the hot water heater to keep the boiling state for a predetermined time is counted, and this count is performed. Since the boiling state can be continued depending on the number, special temperature setting and time setting means for continuing the boiling state are unnecessary, and while removing the descaling by maintaining the boiling state and using it. be able to.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention by longitudinally cutting an electric pot, FIG. 2 is a perspective view showing a state where a heater substrate is partially cut away, and FIG. 3 is a control circuit diagram. FIG. 4 is a flowchart of a heating control subroutine, FIG. 5 is a flowchart of a boiling operation subroutine in FIG. 4, and FIG. 6 is a flowchart of a heat retention subroutine in FIG.
FIG. 7 is a graph showing the relationship between the change of the content liquid temperature and the energizing capacity of the heater used in each operation mode, and FIG. 8 shows the temperature change of the content liquid and the energization of the heater used in the second embodiment of the present invention. FIG. 9 is a graph showing the relationship with the capacity, FIG. 9 is a flow chart of a boiling operation subroutine showing the specific control, FIG. 10 is a graph showing the third embodiment of the present invention, and FIG. 11 is the fourth of the present invention. FIG. 12 and FIG. 13 are graphs showing a modified example of the embodiment of FIG. A graph and a flow chart shown in FIG. 14 are flowcharts of a boiling operation subroutine showing a fifth embodiment of the present invention. 1,1a, 1b …… Heater 55,301 …… Triac 66 …… Microcomputer 91 …… Control circuit 92 …… Heater drive circuit RY1, RY2 …… Relay TR1 to TR4 …… Transistor R-1, R-2 …… Relay contact

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 63-28435 (JP, U)

Claims (1)

[Claims] 1. A boiling operation mode in which an inner solution is boiled by heating a heater when the content liquid is lower than a lower limit temperature during heat retention, a heat retention operation mode in which the content solution is kept at a predetermined temperature, and After the boiling operation, the heater is de-energized and re-energized after a predetermined time, and the boiling state is continued by repeating the de-energizing and energizing of the heater. An electric hot water storage container, each of which has a boiling state continuation mode in which it is determined that the boiling state is continued when the number of times is reached, and the mode is shifted to the heat retention operation mode.