JPH06113962A - Electric hot-water storage container - Google Patents

Abstract

PURPOSE:To dispense with the replacement due to the life of a filter medium by installing a heating control means having the chlorine removal mode for decelerating the boiling starting-up speed than that in the ordinary case, when the initial boiling mode is executed. CONSTITUTION:When boiling processing is requested, heating up to boiling is speedily executed by the bottom surface heaters 8a and 8b. When the temperature keeping processing is requested in succession, the temperature is kept constant only by the bottom surface heater 8b for keeping temperature. When the chlorine removing processing is required, and the chlorine removing mode is set by a reboiling/chlorine removal setting key 104, the initial boiling operation is executed in the chlorine removal mode set in a control circuit separately. Accordingly, temperature is set lower than the electric conduction capacity of the heater in the ordinary initial boiling mode, and the boiling starting-up speed is decelerated. Accordingly, the chlorine component in the low temperature region is evaporated efficiently, and a boiling state is generated at the time point when the chlorine component is dispersed together with chlorine odor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot water storage container, and more specifically, it has a heater for heating the content liquid and a control means for controlling the energization of the heater, and has an initial boiling mode for boiling the content liquid. The present invention relates to an electric hot water storage container.

[0002]

2. Description of the Related Art An electric hot water storage container is often used to fill water, heat it, make tea or coffee, or melt baby's milk.

The liquid content is usually boiled once and then kept warm. However, most of the content liquid is tap water, and it is considered that chlorine is sterilized and remains at the tap.

For this reason, a smell may remain even after boiling. In addition, it is difficult to remove trihalomethanes, which are toxic chlorine compounds.

In order to deal with this, it is also considered to provide a scaly removal mode in which the content liquid is once boiled and then continued to be boiled for a predetermined time, whereby odors and harmful substances are more actively released. .

[0006]

By the way, it is known that trihalomethane is volatile with a low boiling point. Therefore, when raw water from tap water is stored in an electric hot water storage container and heated, the trihalomethane in the content liquid should volatilize and decrease with this heating.

However, according to the experiment, as shown by the characteristic line a in FIG. 9, the amount of trihalomethane in the content liquid increases with heating.

It is considered that this is because residual chlorine in the content liquid and organic substances such as humic acid activate the reaction due to an increase in the temperature of the content liquid, and the amount of trihalomethane produced exceeds the volatilization amount. Be done.

Therefore, if the boiling state of the content liquid is simply continued to diverge the trihalomethanes as in the chlorine removal mode, it is not possible to effectively remove the trihalomethanes, and it is difficult to completely remove the trihalomethanes. The boiling operation is continued for a time.

However, if the boiling operation is continued for a long time, a large amount of steam is generated, so that the surroundings of the electric hot water storage container may be deteriorated, wet, or the room in which the electric hot water storage container is used may be adversely affected.

On the other hand, it is also known that the removal of chlorine is carried out by a filter medium such as activated carbon, which solves the above problems. However, since the filter medium has a limited life, it needs to be replaced regularly, which is troublesome and expensive. In addition, since conditions for chlorinated odors such as regions, seasons, and individual differences are different, it is desirable to be able to select the degree of scaly removal, but it is difficult to satisfy this with a filter medium.

In order to solve these problems, the inventors of the present invention have conducted various experiments and conducted research, and as a result, as shown in FIG. 10, there is a difference between the temperature rise when boiling the content liquid and the residual chlorine. It was found that there is a relationship.

As for this, even if the heater capacity is increased and boiling is accelerated, residual chlorine is not completely removed, so that the duration of boiling becomes long, which is a problem. When the heater capacity is reduced, the boiling is slow, but residual chlorine is completely removed at the time of boiling.

Therefore, focusing on the tendency to emphasize the removal of scaly, it is appropriate to slow the rising speed of boiling at the initial boiling of the content liquid. On the other hand, after boiling,
When the boiling operation is continued for 1 minute, 3 minutes, and 5 minutes, the residual chlorine removal rates are 80%, 90%, and 97%, and the descaling is almost proportional to the duration of the boiling operation, and It is possible to reliably remove the odor of chlorine.

After boiling, even if the boiling operation is not continued, if the content liquid is kept in a boiling state or a state close to this, it is possible to sufficiently remove the chyle and the odor of chyle, and the vapor temperature becomes high and a large amount. It was also found that the problem caused by the occurrence did not occur.

An object of the present invention is to provide an electric hot water storage container capable of solving the above-mentioned problems of the related art based on such knowledge.

[0017]

In order to achieve the above-mentioned object, the present invention has a heater for heating the content liquid and a control means for controlling energization of the heater, and an initial boiling for boiling the content liquid. In an electric hot water storage container having a mode, the first feature is to provide a heating control means having a descaling mode for slowing the rising speed of boiling as compared with the normal case in order to execute the initial boiling mode. To do.

In order to achieve the above object, the present invention has a heater for heating the content liquid, and a control means for controlling energization of the heater, a boiling mode for boiling the content liquid, and a content liquid. In an electric hot water storage container having a heat retention mode for retaining the temperature, in order to execute the boiling mode,
A second feature is to provide a heating control means having a descaling mode in which a boiling operation and a heat retaining operation are alternately performed for a predetermined time and a predetermined number of times after the content liquid has boiled.

In these cases, the descaling mode can be set by a special setting or operation of the releasing means, or the setting can be released.

Further, it is preferable that the heating control means has a heating mode for interrupting the boiling operation for a predetermined time during the boiling operation in the descaling mode.

Further, the heating control means has a heating mode in which the boiling temperature of the trihalomethanes having a low boiling point and volatility is maintained during the suspension of the boiling operation and the boiling operation is continued until the content liquid is boiled after a lapse of a predetermined time. Is more preferable.

[0022]

According to the above-mentioned constitution of the first feature of the present invention, in executing the initial boiling mode, there is a descaling mode in which the rising speed of boiling is slowed down. Since the temperature rises slowly and it takes a long time to reach the boiling state, trihalomethanes and the like having low boiling points and volatility are actively liberated in the low temperature region while suppressing their production, and it takes sufficient time for boiling. It can be fully emitted to the outside along with the odor of chlorine.

According to the above configuration of the second feature of the present invention,
To execute the boiling mode, after boiling, the boiling operation and the heat retention operation are alternately performed for a predetermined number of times for a predetermined number of times, and the content liquid boiles even during the heat retention operation by repeating the intermittent boiling operation with the heat retention operation interposed. The temperature does not drop much due to residual heat during operation, and the bleaching and odor can be actively emitted without observing the large amount of high-temperature steam generated as in the case of continuing the boiling operation.

In these cases, if the descaling mode is set by a special setting or operation of the canceling means, or if this setting is cancelled, the descaling can be achieved by taking a sufficient time if necessary. It is possible to finish the initial boiling without taking a long time unless necessary.

If the heating control means interrupts the boiling operation for a predetermined time during the boiling operation in the descaling mode, the content liquid is heated up so much that trihalomethane is produced in a large amount, which hinders descaling. Can be prevented.

Further, the boiling operation is interrupted when the content liquid reaches the boiling temperature range of the trihalomethanes, and is maintained in the boiling temperature range at the time of the interruption, thereby suppressing the production of the trihalomethanes. However, since the generated trihalomethanes are actively volatilized and released due to the content liquid being kept in the boiling temperature range thereof, the removal rate of the trihalomethanes in the content liquid can be maximized.

[0027]

1 to 6 show a first embodiment of an electric hot water storage container to which the present invention is applied.

As shown in FIG. 1, an inner container 2 is housed in an outer case 3 to form a body 1.

The upper end flange of the inner container 2 is received by a shoulder member 4 made of synthetic resin which is forcibly fitted to the upper end of the outer case 3.

A bottom ring 7 made of synthetic resin is applied to the lower end of the outer case 3, and the bottom ring 7 and the bottom of the inner container 2 are connected by a connecting fitting (not shown) to form the outer case 3 and the inner container 2. And the bottom ring 7 are integrated with each other.

A bottom lid 10 is attached to the opening of the bottom ring 7 by fitting a plurality of claws provided on the bottom lid 10 and screwing at one location.

A rotary seat body 9 is rotatably fitted to the outer peripheral portion of the lower surface of the bottom lid 10 by a plurality of claws provided on the bottom cover 10. When the body body 1 is stationary, the rotary seat body 9 is mounted on the rotary seat body 9. 1
Can be rotated lightly.

A bottom heater 8 is provided on the lower surface of the bottom of the inner container 2.
a and 8b are applied. This bottom heater 8a, 8
Reference numeral b denotes a water heater and a heat-retaining heater. For example, the wire bottom heaters 8a and 8b are alternately wound around an annular mica plate, sandwiched between the mica plates, and housed in a case.

A heat shield plate 32 is screwed to the bottom of the inner container 2 by using a metal fitting 31, and a presser 35 is sandwiched between the heat shield plate 32 and the back side of the bottom heaters 8a and 8b. Thereby, the bottom heaters 8a and 8b are pressed against the bottom surface of the bottom of the inner container 2. The pouring pump 11 is attached to a part of the heat shield plate 32.

In the central through holes of the bottom heaters 8a and 8b,
A temperature sensor 33 that detects the temperature of the content liquid is provided, and is thermally isolated from the bottom heaters 8a and 8b by the heat shield wall 34, and the temperature of the inner container 2 is accurately detected without the thermal influence of the bottom heaters 8a and 8b. I am able to do it.

A circuit housing box 40 is provided on the bottom ring 7 so as to open downward, and a circuit board 41 housed in the circuit housing box 40 is waterproof against water leakage from above.

Control circuit 4 mounted on this circuit board 41
Reference numeral 2 is a microcomputer 43 that receives output signals from the operation board 18 and detection signals from various sensors to control operation of boiling and heat retention, and display operation thereof and display control by timer setting. Is supposed to do.

At the upper end of the body 1, the body 1 formed by the shoulder member 4 is formed.
A container lid 6 for covering the mouth portion 61 of the container is provided. The inner peripheral portion of the mouth edge of the mouth portion 61 is formed on the tapered surface 65, and the outer peripheral edge of the outer plate 64 of the vessel lid 6 is also formed on the tapered surface 65.

Due to these tapered surfaces 65, both contact surfaces of the container lid 6 in the closed state are aligned with each other, and the outer surfaces of the shoulder member 4 and the container lid 6 are flush with each other at the contact boundary portion 67. Become. The body lid 6 is attached to the shoulder member 4 at the rear by a hinge pin 68.
It is pivotally attached so that it can be opened and closed. The vessel lid 6 is pivotally attached to a bearing 69 formed integrally with the shoulder member 4, and when the vessel lid 6 is opened, the hinge pin 68 is used to support the bearing 6.
It can be attached and detached from 9.

By attaching / detaching the hinge pin 68, the container lid 6 can be attached / detached, which facilitates cleaning of the inside of the container 1 and supply / drainage of the content liquid.

At the free end of the body lid 6, there is provided a lock member 71 for advancing and retracting the upper surface of the back plate 81 of the body lid 6 to lock the body lid 6 in the closed state.

The locking member 71 has a locking projection 72 integrally formed at the tip end thereof and a sliding contact surface 73a at the rear end 73 thereof.

The spring 76 presses and urges the lock member 71 so that the locking projection 72 at the tip elastically engages with the engagement hole 70 formed in the shoulder member 4, and the body lid 6 is attached to the shoulder member 4. Keep closed.

A cam portion 79b of a lock release lever 79 having an operating portion 79a is in contact with the rear end portion 73 of the lock member 71. The lock member 71 is rotatably attached to a bearing portion in the body lid 6 by a shaft 78.

The lock release lever 79 is the lock member 7.
When 1 is advanced to the engagement position by the spring 76, the operation portion 79 a is inserted into the upper surface opening 80 of the body lid 6 at the body lid 6.
It is flush with the surface of.

On the lower surface of the back plate 81 of the vessel lid 6, the inner container 2
A metal inner lid 85 that closes the rear of the
It is screwed at 3. Outer periphery of inner lid 85 and back plate 81
A seal packing 84 facing the rim of the inner lid 85 is sandwiched between and, and when the body lid 6 is closed, the inner lid 85 contacts the rim of the inner container 2 with the seal packing 84, Close the inner container 2.

As shown in FIG. 3, a steam passage 87 is provided between the back plate 81 and the inner lid 85 to let steam generated in the inner container 2 escape to the outside.

This steam passage 87 has an opening 86 to the inner container 2 side in the inner lid 85, and has an opening 52 to the outside on the rear side upper surface of the vessel lid 6.

A liquid reservoir 90 fitted from below through a seal member 88 is pressed by a back plate 81 into the opening 86.

This liquid storage body 90 is annular and has a valve chamber 91 which accommodates a water stop valve 92 at the time of fall which is closed when the body 1 is fallen.
And a first area 93 divided into several parts, and this first area 93
Forming a content liquid reservoir chamber consisting of a second region 94 around the.

Immediately downstream of the valve chamber 91, a reservoir 50 having a wide space reaching the upper portion of the vessel lid 6 is provided. In this pool portion 50, a downstream outlet 51 communicating with the opening 52 is oriented laterally and the passage cross-sectional area is reduced.

Various arrangements have been made with respect to the outlet 51 such that the shape of the reservoir 50 is widened in the front, rear, left and right directions of the body 1 and the upper surface of the body lid 6. .

As a result, when the water stop valve 92 at the time of the fall moves to the position shown by the phantom line when the body 1 falls to the front or rear or to the left or right, the liquid content is stopped by the water stop valve 92 at the time of the fall. When the content liquid is attempted to flow out through the vapor passage 87 without being blocked, the content liquid to be flowed out is stored in the reservoir 50, and the flow of the content liquid to the downstream side is suppressed or prevented until the content liquid overflows.

Further, the first area 93 and the second area 94 of the liquid reservoir 90 suppress the outflow of the content liquid to the outside, and return the body 1 to a normal state before the outflow to the outside. You can give a sufficient margin.

When the body lid 6 is opened, when a finger is put into the upper surface opening 80 and the operating portion 79a is lifted, the lock release lever 79 rotates clockwise, and the lock release lever 79 is rotated.
The rear end portion 73 of the lock member 71 is pressed by the cam portion 79b.

As a result, the lock member 71 is pushed and retracts against the spring 76, so that the engagement hole 70 and the engagement projection 72 are disengaged.

Further, when the operation portion 79a is moved upward, the unlocked body lid 6 is opened. The spring 76 presses the lock member 71 by a natural operation of releasing the hand from the operation portion 79a, and the locking projection 72 is projected from the free end portion of the body lid 6.

On the other hand, when the body lid 6 is closed, when the body lid 6 is rotated, a locking projection 72 is formed on the inner peripheral edge portion 62 of the shoulder member 4.
When is inserted, it is projected and locked by the pressing force of the spring 76.

In this closed state, the base lid 6 is locked by the inner lid 85 provided on the inner surface side. In this closed state, the mouth of the inner container 2 is closed by the inner lid 85 provided on the inner surface side of the vessel lid 6. At this time, the seal packing 84 seals between the inner lid 85 and the mouth of the inner container 2.

A pouring path 12 for pouring out the content liquid is connected to the bottom of the inner container 2. The pouring path 12 rises up to the inside of the beak-shaped protrusion 5 provided in the front portion of the shoulder member 4 in the space between the inner container 2 and the outer case 3.

The beak-shaped protrusion 5 protrudes from the shoulder member 4, and a passage cover 15 forming a part of the beak-shaped protrusion 5 is fitted in the downward opening. A lower cover 15a and a liquid injection guide 16 are integrally formed with the passage cover 15, and the discharge port 19a is covered with the outer surface of the body 1 and the discharge port 19a is exposed downward.

At the portion of the spout 12 below the inner container 2, the content liquid flowing into the spout 12 is discharged from the outlet 1.
A pouring pump 11 for feeding to 9a is provided and is driven by a motor. Although not shown in the drawing, the rising portion of the pouring path 12 has the same liquid level as the inner container 2, so that the liquid amount is detected by using a capacitance or a photo sensor. A detector is provided.

The discharge port 19a is made of elastic silicon rubber, and an annular seal portion 20 is integrally formed in the middle of the discharge port 19a, and a projecting portion 19b is provided on the lower portion of the seal portion 20.

The discharge pipe 19 is connected to the connection pipe 14, and when the passage cover 15 is attached to the beak-shaped protrusion 5, the protrusion 19b contacts the inner peripheral wall 16c of the liquid injection guide 16. Also, at the edge of the upper opening 16a of the liquid injection guide 16,
The seal portion 20 abuts and is firmly held while being pressed by a pressing force.

As a result, the upper opening 16a and the lower opening 16 of the liquid injection guide 16 which are the openings of the beak-like protrusion 5 are formed.
An annular gap G formed between b and the lower end of the discharge pipe 19, which is the spout, is sealed by the seal portion 20.

Further, the discharge pipe 19 is provided with a slit 19c in the length direction of the discharge pipe 19 at a part of the end edge of the lower end, and when the content liquid is discharged from the lower end, it is opened to the atmosphere at the upper end of the slit 19c. Therefore, it is possible to discharge as a quiet laminar flow without splash.

An operation panel 17 is provided on the upper surface of the beak-shaped protruding portion 5, and the operation panel 17 is as shown in FIG. 2, and in addition to the pouring operation key 102, the re-boiling / descaling removal setting key 104. , Timer setting key 105, pouring lock
A release key 106 and liquid amount display units 111 to 113 are provided.

The re-boiling / scalping removal setting key 104 and the pouring lock / release key 106 are set so that the setting mode is changed to a rotary type each time they are operated.

FIG. 3 shows a control circuit 42. As shown in the figure, the control circuit 42 has electric / electronic components relating to the various inputs / outputs, such as an A / D converter 301, a switch circuit 303, a drive circuit 304, and a display circuit 305. Are properly connected via.

The operation will be described below. FIG. 4 is a flowchart of the main routine showing the main operation control. When the power is turned on, the initial setting of step # 1 is first performed, and then the processing corresponding to various inputs is performed (step ##).
2).

Next, when the boiling process (step # 3) is called and it is unreasonable or time-consuming for the content liquid to rise to the heat retention temperature in the heat retention mode, that is, water supply When the content liquid temperature is low at the initial stage or due to the replenishment of the content liquid, or when reboiling is set by the reboiling / scaling removal setting key 104, in a high capacity energization state by both bottom heaters 8a and 8b,
It controls to heat up to boiling quickly.

Subsequently, the heat retention process (step # 4) is called, and after the initial boiling or re-boiling, the bottom heater 8a,
The energization is controlled so that the content liquid is maintained at a predetermined heat-retaining temperature in a low-capacity energizing state of only the heat-retaining bottom heater 8b.

When the timer process (step # 5) is called and the timer is set by the timer setting key 105, the boiling operation disclosure time is delayed until the time required for boiling the content liquid at the timer setting time. Delay control is performed so that the boiling operation starts from.

Next, when the descaling process (step # 6) is called and the descaling / descaling setting key 104 is set to the descaling mode, step # 6 is executed.
The initial boiling operation when the content liquid in 3 is below a predetermined temperature,
Separately from the above, the descaling mode set in the control circuit is executed.

This descaling mode is set lower than the energizing capacity of the heater in the normal initial boiling mode to slow the rising speed of boiling.

As a result, the calcination component can be efficiently volatilized in the low temperature region, and the boiling state can be obtained at the time when the calcination component is completely emitted together with the odor.

Next, the pump process (step # 7) is called, and the pouring pump 11 is operated by operating the pouring operation key 102.
To drive the pouring.

Finally, after the other processing (step # 8) is completed, the process returns to step # 2, and the above control is repeated thereafter.

FIG. 5 is a flow chart showing a concrete example of the subroutine of the descaling process.

The basic current-carrying capacity of the heater in the descaling mode is 600 W, and 905 W in the initial boiling in the normal mode.
Lower than.

As a result, the rising speed of boiling in the descaling mode shown by the solid line is slower than the rising speed of initial boiling in the normal mode shown by the broken line in FIG.

When the descaling mode is executed by the timer control using the time while sleeping or going out, there is no adverse effect of the boiling delay control.

Particularly in this embodiment, since the amount of the content liquid has a great influence on the boiling rate due to the low energization capacity of the heater, the control is performed in consideration of the water amount of the content liquid.

Specifically, a predetermined intermediate temperature, for example, 40
The degree of temperature rise and the amount of water for a predetermined unit time from when the temperature reaches ℃ are determined, and the energizing capacity of the heater corresponding to the amount of water is set as 600 W ± α from the data obtained by experiments in advance.

Next, the time required for the content liquid to rise in temperature by 10 ° C. is measured, and if it is later than the theoretical value, the energizing capacity is increased by a predetermined amount, and if it is early, the energizing capacity is decreased by a predetermined amount. As a result, the set ideal temperature rise is achieved.

FIG. 7 shows a second embodiment of the present invention. During the boiling operation in the descaling mode in which the energization capacity is lower than the normal energizing capacity, the boiling point temperature range 62 of the trihalomethane whose content liquid has a low boiling point and is volatile is shown. When the temperature reaches ℃, the content liquid is kept at 62 ℃ for a predetermined time set by the timer. While suppressing the production of trihalomethane in the content liquid during this period,
It promotes volatilization and emission of the generated trihalomethane.

As a result, in addition to the case of the descaling mode in the above-mentioned embodiment, the generated trihalomethanes are suppressed while suppressing the generation of trihalomethanes due to the heating of the contents liquid while keeping the contents liquid in the boiling temperature range. Since the contents liquid is volatilized and released actively by keeping the contents liquid in the boiling point temperature range thereof, the production amount of trihalomethanes in the contents liquid is shown in the characteristic line b of FIG. 9 in a relatively short time. It is possible to significantly reduce the amount of trihalomethanes, and chlorine in the content liquid is also reduced by the amount of trihalomethanes released, so after the lapse of a predetermined time, the boiling operation is continued until the content liquid is boiled. Although the content liquid is used, the amount of trihalomethanes produced by the heating after this time is small due to the decrease in chlorine, and the trihalomethanes produced are sufficiently vaporized. You can boil the liquid contents while diverging.

In the case of the present embodiment, in consideration of the interruption time of the boiling operation, the current carrying capacity is set to about 700 W as shown by the alternate long and short dash line in FIG. It is a little faster than the case so that the boiling end times are the same.

However, when there is a time margin such as in the descaling mode when the timer is set, it is not necessary to increase the boiling rising speed. Therefore, the rising speed of boiling of the content liquid can be switched depending on whether the timer is being set.

FIG. 8 shows the third embodiment of the present invention. After boiling the content liquid in the normal mode, the boiling operation is performed for 1 minute, the heat retaining operation is performed for 1 minute or 2 minutes, and the boiling operation is performed for 1 minute or. 2 minutes,
I am going to do it sequentially.

In this case, the content liquid is as high temperature steam as the case where the boiling operation is continued without the temperature being lowered by the residual heat in the boiling operation even during the heat retaining operation by repeating the intermittent boiling operation with the heat retaining operation. Without seeing a large number of
It can actively emit khaki and khaki odor,
It is possible to prevent the surroundings of the electric hot water storage container from being deteriorated or wetted due to the generation of a large amount of high-temperature steam, and to prevent the generated steam from affecting the surrounding environment.

Also in the case of this embodiment, it can be executed in combination with various descaling modes applied to each of the above-mentioned embodiments, and each operation time and repetition of the boiling operation after the boiling and the heat retaining operation are repeated. The number of times is arbitrary. It is also possible to select and execute various combinations of these. Therefore, it is possible to achieve descaling according to the region, season, individual difference, and the like.

Moreover, when the descaling is achieved by controlling the energization of the heater as in each of the above-described embodiments, the descaling means and functions have no life, and the problem of replacement due to the life such as in the case of using the filter material is solved.

[0094]

According to the present invention, since the chlorine and the chlorine odor are removed by controlling the energization of the heater, there is no problem of replacement due to the service life as in the case of using the filter medium, and the various control contents can be set. The mode can be selected and achieved as needed.

In particular, according to the first feature, the calcination removal mode that slows the rising rate of boiling during the initial boiling effectively prevents trihalomethane or the like having low boiling point and volatility in the low temperature range while efficiently suppressing the formation thereof. It is liberated, and it takes sufficient time to boil and is sufficiently diffused to the outside along with the odor of scalp, so that it is possible to achieve sufficient removal of scaly including odor of scaly as the content liquid reaches boiling. Moreover, it is not necessary to continue boiling for removing the chlorine, and the adverse effects of continued boiling can be eliminated.

According to the second feature, the boiling liquid is kept warm by the descaling mode in which the boiling operation and the heat retaining operation are alternately performed for a predetermined number of times for a predetermined number of times after the boiling. It receives repeated intermittent boiling motions, and the temperature does not drop due to the residual heat during the boiling motions even during the heat retention operation. Moreover, since the chlorine odor can be actively emitted, it is possible to sufficiently remove the chlorine and the chlorine odor in a short time and to avoid the harmful effects caused by the generation of a large amount of high temperature steam.

In these cases, if the descaling mode is set by a special setting or operation of the canceling means, or if this setting is canceled, the descaling can be achieved by taking a sufficient time as necessary. It is convenient to use because it can finish the initial boiling without taking a long time unless necessary.

If the heating control means suspends the boiling operation for a predetermined time during the boiling operation in the descaling mode, the content liquid is heated up so much that trihalomethane is produced in a large amount, which hinders descaling. This prevents the descaling and improves the descaling performance.

Further, the interruption of the boiling operation is performed when the content liquid reaches the boiling temperature range of the trihalomethanes, and is maintained in the boiling temperature range at the time of this interruption, so that the trihalomethanes are sufficiently produced. While the content of the trihalomethanes is kept in the boiling temperature range, the generated trihalomethanes are volatilized and volatilized actively, which improves the removal rate of the trihalomethanes in the content liquid. Can be more fully achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric hot water storage container as an embodiment to which the present invention is applied.

FIG. 2 is a cross-sectional view showing an operation panel section of FIG.

FIG. 3 is a diagram of the control circuit of FIG.

FIG. 4 is a flowchart showing a main routine of main operation control of the control circuit of FIG.

5 is a flowchart of a descaling process subroutine of FIG.

6 is an example of a temperature change of the content liquid due to the process of FIG.
It is a graph which shows together with the case of a normal mode and a 2nd Example.

FIG. 7 is a flowchart showing a characteristic part of a descaling subroutine showing a second embodiment of the present invention.

FIG. 8 is a flow chart showing a descaling subroutine showing a third embodiment of the present invention.

FIG. 9 is a graph showing the relationship between the content liquid temperature and the residual amount of trihalomethane in comparison between the conventional case and the example of the present invention.

FIG. 10 is a graph showing the relationship between the current-carrying capacity of the heater and the residual chlorine removal rate.

[Explanation of symbols]

 2 Inner container 8a, 8b Bottom heater 33 Temperature sensor 42 Control circuit 43 Microcomputer 104 Re-boiling / descaling key

Claims (5)

[Claims] 1. An electric hot water storage container having a heater for heating a content liquid and a control means for controlling energization of the heater, and having an initial boiling mode for boiling the content liquid, wherein the initial boiling mode is executed. In addition, the electric hot water storage container is provided with heating control means having a descaling mode for slowing the rising speed of boiling as compared with the normal case. 2. An electric hot water storage container having a heater for heating the content liquid and a control means for controlling energization of the heater, and having a boiling mode for boiling the content liquid and a heat retention mode for keeping the content liquid warm. In, in order to perform the boiling mode, after the content liquid has boiled,
An electric hot water storage container provided with heating control means having a descaling mode in which a boiling operation and a heat retaining operation are alternately performed for a predetermined time and a predetermined number of times. 3. The electric hot water storage container according to claim 1, wherein the descaling mode is set by a special setting or operation of a canceling unit, or the setting is canceled. 4. The electric hot water storage container according to claim 1, wherein the heating control means has a heating mode for interrupting the boiling operation for a predetermined time during the boiling operation in the descaling mode. 5. The heating control means sets a heating mode in which the boiling operation is maintained at a boiling temperature of trihalomethanes having a low boiling point and volatility during the suspension of the boiling operation, and the boiling operation is continued until the content liquid is boiled after a predetermined time elapses. The electric hot water storage container according to claim 4, which has.