JP3116947B1 - Electric water heater - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To accurately supply a liquid at a set temperature within a short time after starting heating regardless of the amount of liquid stored in a container, and to continuously set the liquid in the entire container when the temperature is stabilized. It is intended to be supplied at a temperature. SOLUTION: When a temperature of a liquid in a divided heating container 12 for dividing and heating a liquid in a container 11 reaches a predetermined temperature is detected by a temperature detecting means 14, the notifying means 16 notifies the liquid and further continues the heating. Then, when the second temperature detecting means 15 detects that the liquid temperature outside the divided heating vessel 12 has reached a predetermined temperature, the heating output is reduced and the divided heating vessel 12
Heating means 13 to maintain the outside liquid temperature at a predetermined temperature.
, It is possible to supply the liquid at the set temperature in a short time at the start of heating, and to continuously supply the liquid having a capacity equal to or larger than the capacity of the divided heating container 12 at the set temperature when the heat insulation is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater used in homes and offices.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram of a conventional electric water heater.
Shown in In FIG. 7, a liquid is stored in a container 11. The liquid contained in the container 11 is heated by the heating means 13. The temperature detecting means 14 is attached in contact with the container 11 and detects the temperature of the liquid in the container 11. The time during which the temperature is raised by the temperature detecting means 14 is measured by the time measuring means 19, and when the time detected by the time measuring means 19 reaches the predetermined time or more, the control means 17 determines that the temperature rise of the liquid in the container 11 is saturated. Thus, the heating output of the heating means 13 was reduced, and the heating means 13 was turned on and off so that the temperature of the liquid in the container 11 was maintained at the set temperature. Further, the liquid in the container 11 was discharged to the outside of the container by the discharge means 18.

[0003]

However, in the above-mentioned conventional configuration, when a full amount of liquid is put into the container 11, there is a problem that it takes time for the temperature of the liquid to reach the set temperature. For example, it takes about 20 minutes to boil about 3 liters of water to 90 ° C. or more with a 1 kW heater. The amount of liquid to be put into the container 11 had to be adjusted, such as heating. Further, when a small amount of liquid is heated, there is a problem that the liquid in the container 11 immediately becomes empty, so that the container 11 must be replenished with liquid frequently.

As means for quickly boiling a liquid, Japanese Patent Laid-Open No.
There is also an example of a water heater and a water heater described in Japanese Patent Application Laid-Open No. 0-185323. Cannot be continuously supplied at a set temperature. In order to continuously supply the liquid at the set temperature, the capacity of the heating container must be set to a size capable of supplying, for example, 5 to 6 cups of 200 cc, and in this case, the heating rate of the liquid in the heating container Was slow.

The present invention solves the above-mentioned problems, and supplies a liquid at a set temperature accurately with a short time from the start of heating regardless of the amount of liquid in the container. To supply at the set temperature

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a container for containing a liquid, heating means disposed below the container for heating the liquid in the container, A divided heating vessel for dividing and heating the liquid, temperature detecting means for detecting the temperature of the liquid in the divided heating vessel, second temperature detecting means for detecting the temperature of the liquid outside the divided heating vessel, A control unit for controlling the heating unit and the notification unit based on detection results of the temperature detection unit and the second temperature detection unit; The temperature detected by the means detects temperature saturation of the liquid in the divided heating vessel.
Then, when the detected temperature of the temperature detecting means and the second temperature detecting means reaches a predetermined temperature, the heating output of the heating means is reduced, and the liquid outside the divided heating container is set. The heating means is controlled so as to maintain the temperature.

With this configuration, when the heating is started by replenishing the liquid in the container, first, the liquid in the divided heating container is heated and the temperature rises. Even when the heating is started, the liquid at the set temperature can be supplied in a short time after the heating is started. In addition, the liquid temperature in the divided heating container is
To notify that the temperature has reached the temperature saturation ,
It is possible to easily identify that the liquid at the set temperature can be supplied.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric kettle according to claim 1 of the present invention comprises a container for storing a liquid, heating means disposed below the container for heating the liquid in the container, and the container. A divided heating container for dividing and heating the liquid in the divided heating container, a temperature detecting unit for detecting a temperature of the liquid in the divided heating container, a second temperature detecting unit for detecting a temperature of the liquid outside the divided heating container, and a device. And a control unit that controls the heating unit and the notification unit based on the detection results of the temperature detection unit and the second temperature detection unit. The detection temperature of the detection means detects temperature saturation of the liquid in the divided heating container .
Notified by said notifying means, and said not detect the temperature of the temperature sensing means and said second temperature sensing means reduces the heating output of the heating means to reach a predetermined temperature, sets the divided heating vessel outside the liquid temperature And the heating means is controlled so as to maintain the temperature.

With this configuration, when the heating is started by replenishing the liquid in the container, first, the liquid in the divided heating container is heated and the temperature rises. Even when the heating is started, the liquid at the set temperature can be supplied in a short time after the heating is started. Further, since the liquid temperature of the divided heating vessel to notify at notifying means that you have reached the saturation temperature, it is possible to liquid saturation temperature easily identify that it is a state that can be supplied. Further, even after the temperature in the divided heating container reaches the predetermined temperature, heating is continued until the temperature detected by the second temperature detecting means reaches the predetermined temperature, and after the heating is completed, the temperature outside the divided heating container is set at the predetermined temperature. Since the temperature is maintained, it becomes possible to continuously supply all the liquid in the container at the set temperature when the temperature is stabilized.
In addition, since the temperature saturation of the liquid in the divided heating container is detected, even when the detection temperature of the temperature detecting unit and the liquid temperature in the divided heating container are poor in tracking, the influence of the detected temperature variation due to the radiant heat of the heating unit is not affected. Without receiving, it is possible to simply detect the temperature of the liquid in the divided heating container at a predetermined temperature with a simple mounting configuration of the temperature detecting means.

An electric water heater according to a second aspect of the present invention has discharge means for discharging liquid from inside the divided heating vessel, and detects temperature saturation of the liquid in the divided heating vessel.
The liquid ejection by the ejection means is prohibited.
An electric kettle as described .

Thus, when the liquid temperature in the divided heating container is low, the liquid cannot be discharged from the discharge means,
It is possible to reliably supply only the liquid at the set temperature without discharging the liquid at a low temperature.

According to a third aspect of the present invention, when the temperature detected by the temperature detecting means is equal to or higher than the predetermined temperature and the temperature detected by the second temperature detecting means is equal to or lower than the predetermined temperature, the electric water heater is discharged for a predetermined time. The liquid discharging by the means is prohibited, and the heating means continuously heats the liquid.

Thus, even if the liquid is discharged during heating or a low-temperature liquid is added to the container and the liquid temperature in the divided heating container drops, the liquid is forcibly irrespective of the temperature detected by the temperature detecting means. Since the heating is performed and the liquid cannot be discharged, it is possible to reliably supply only the liquid at the set temperature without discharging the liquid at a low temperature.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) The first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the present embodiment, and FIG. 2 is a diagram showing temperature, time, and each output state showing temperature control of the present embodiment.

In FIG. 1, reference numeral 11 denotes a container for containing a liquid;
Reference numeral 12 denotes a divisional heating container for dividingly heating the liquid in the container 11, which is made of PPS in this embodiment. The divided heating container 12 is made of a material other than PPS, which has a higher specific gravity than the liquid to be heated and has a low thermal conductivity, so that the heating efficiency of the liquid in the divided heating container 12 can be increased. Further, the divided heating containers 12 are provided with slits for allowing liquid in the container 11 outside the divided heating containers 12 to enter into the divided heating containers 12 for A and B respectively.

Reference numeral 13 denotes a heating unit for heating the liquid in the container 11 and the divided heating container 12, and 14 denotes a temperature detecting unit for detecting the temperature of the liquid in the divided heating container 12, and a thermistor detects the liquid in the divided heating container 12. The temperature is detected through the contacting container part. 15 is a divided heating container 12
The second temperature detecting means for detecting the temperature of the liquid outside the container is configured to detect the temperature via a container portion in contact with the liquid outside the divided heating container 12 by a thermistor. Reference numeral 16 denotes a notifying unit for notifying the operation state of the device, which normally displays and notifies by using an LED, LCD, or buzzer. 17 is a temperature detecting means 1
Control means for controlling the heating means 13 and the notification means 16 based on the detection results of the fourth and second temperature detection means 15 and is constituted by a microcomputer. A discharge means 18 discharges the liquid from the inside of the divided heating container 12, and discharges the liquid by an electric pump.

The operation of the electric water heater configured as described above will be described. When heating is started in a state where the liquid is contained in the container 11, the liquid in the portion facing the heating means 13 is heated and the temperature is increased. Since the liquid in the portion facing the heating means 13 is surrounded by the divided heating vessel 12, most of the heating output of the heating means 13 is absorbed by the liquid in the divided heating vessel 12, and as shown in FIG. The temperature of the liquid inside rises sharply with respect to the liquid outside the divided heating container 12. Until the temperature of the liquid in the divided heating container 12 reaches T1, the notification unit 16 performs notification in the notification 1 pattern. When the temperature detecting means 14 detects that the liquid temperature in the divided heating container 12 is equal to or higher than T1, the notifying means 1
Reference numeral 6 changes to the notification 2 pattern to notify that the liquid temperature in the divided heating container 12 has reached a predetermined temperature. When the heating is further continued and the second temperature detecting means 15 detects that the liquid temperature outside the divided heating vessel 12 has reached T2,
The control means 17 controls the heating means 13 so as to maintain the set temperature by lowering the heating output of the heating means 13, and changes the notification means 16 to the notification 3 pattern so that the liquid outside the divided heating container 12 is Notifies that heat is kept at a predetermined temperature. Discharge unit 1 in the state of information 2 or information 3
When the liquid in the container 11 is discharged by the liquid 8, a liquid having a set temperature can be supplied.

As described above, according to this embodiment, for example, 3
When about 1 liter of water is heated by a 1 kW heater, if the capacity of the divided heating vessel is 0.3 liter, the water in the divided heating vessel will be boiled in about 2 to 3 minutes. It is possible to supply liquid at a set temperature.
In addition, since the notification means notifies whether or not the liquid in the divided heating container has reached the set temperature, the temperature state of the liquid in the divided heating container can be identified at a glance. further,
Since the liquid outside the divided heating container is kept at a predetermined temperature, the liquid in the whole container can be continuously supplied at the set temperature after the keeping of the temperature. As a result, the capacity of the divided heating container can be set to the necessary minimum size, so that the liquid at the set temperature can be supplied in a shorter time.

A similar effect can be obtained in a coffee maker having an extraction container installed at the end of the discharge port.

Embodiment 2 Embodiments 2 and 3 of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing the present embodiment, and FIG. 4 is a diagram showing temperature, time, and each output state showing the temperature control of the present embodiment.

In FIG. 3, reference numerals 11 to 18 are the same as in the first embodiment, and a description thereof will be omitted. Reference numeral 19 denotes a time measuring means for measuring the time required for the temperature detected by the temperature detecting means 14 to increase by ΔT, and is constituted by a microcomputer.

The operation of the electric water heater configured as described above will be described. When the heating is started in a state where the liquid is contained in the container 11, the liquid in the divided heating container 12 is separated from the divided heating container 1 as shown in FIG.
(2) The temperature rises sharply for the liquid outside. The time during which the temperature detected by the temperature detecting means 14 rises by ΔT is counted by the time keeping means 19, and as shown in FIG. The time set by the control means 17 to detect the saturated state of the liquid temperature is ts, and the output of the notification means 16 remains at the notification 1 during the time t1 when the detection time by the timekeeping means 19 is shorter than ts. At this time, the operation of the ejection means 18 is prohibited, and it is impossible to eject the liquid. If the heating is further continued, the temperature of the liquid in the divided heating container 12 becomes boiling or saturated, and the time during which the temperature detected by the temperature detecting means 14 rises by ΔT also becomes longer. Then, when the detection time of the timer 19 becomes t2 longer than ts, as shown in FIG. 4, the notification unit 16 changes to the notification 2 pattern, and the liquid discharge by the discharge unit 18 becomes possible. After detecting the saturated state of the liquid temperature in the divided heating container 12, the same control as in the first embodiment is performed.

As described above, according to this embodiment, the output of the notifying means is changed by detecting the saturation state of the temperature rise in the divided heating vessel, so that the liquid temperature and the temperature detection in the divided heating vessel at the time of heating are changed. Even if the detection temperature of the temperature detection means is affected by the radiant heat from the heating means, etc., it is possible to stably and accurately detect that the temperature has reached the predetermined temperature. The liquid at the set temperature can be supplied in time.

Further, by prohibiting discharge by the discharge means until the temperature in the divided heating container becomes saturated,
Only the liquid at the set temperature can be reliably discharged.

A similar effect can be obtained in a coffee maker having an extraction container provided at the end of the discharge port.

Embodiment 3 Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 5 and FIG. 6 are diagrams showing temperature, time, and each output state showing the temperature control of the present embodiment. The configuration is the same as that of the second embodiment, and the description is omitted.

The operation of the electric water heater configured as described above will be described. When heating is started with the liquid in the container 11 and the notifying unit 16 discharges the liquid in the divided heating container 12 from the discharging unit 18 in the state of the notification 2, the same amount of liquid as the discharged amount is obtained. It flows in from outside the divided heating vessel 12. During the heating, the liquid temperature outside the divided heating container 12 is lower than the set temperature, so that the liquid temperature inside the divided heating container 12 decreases as shown in FIG.

Even if a low-temperature liquid is added to the container 11 during heating, the temperature of the liquid outside the divided heating container 12 decreases as shown in FIG. , Part of the additional liquid or divided heating vessel 12
When the outside liquid flows into the divided heating container 12, the temperature of the liquid in the divided heating container 12 decreases.

As described above, even if the liquid temperature in the divided heating container 12 decreases during heating, in a configuration in which the detection temperature of the temperature detecting means 14 and the liquid temperature in the divided heating container 12 are poor, the heating means 13 Due to the influence of radiant heat from the sensor, the detected temperature of the temperature detecting means 14 may not fall below the set temperature T3 at which the output of the notifying means 16 is changed to the notification 1, or it may be delayed to become lower than T3. However, if the temperature detected by the second temperature detecting means is equal to or lower than the predetermined temperature, after the liquid is discharged or after the second temperature detecting means detects a temperature decrease outside the divided heating container 12, the detection result of the temperature detecting means 14 is obtained. Irrespective of
The liquid in the 0-time division heating container 12 is forcibly heated by the heating means 13, and the output of the notification means 16 is changed to the notification 1. During the forced heating, the ejection of the liquid by the ejection unit 18 is also prohibited. After the predetermined time has passed and the forced heating is completed, control is performed again based on signals from the temperature detecting means 14, the second temperature detecting means 15, and the time measuring means 19.

As described above, according to the present embodiment, even if the liquid is discharged during heating or the temperature of the liquid in the divided heating container is lowered due to the addition of a low-temperature liquid, the heating means forcibly applies the predetermined time. Since the heating is performed and the ejection of the liquid by the ejection unit is prohibited, the liquid at the set temperature can be reliably supplied without ejecting the liquid at a temperature lower than the set temperature.

The same effect can be obtained in a coffee maker having an extraction container installed at the end of the discharge port.

[0032]

According to the first aspect of the present invention, it is possible to supply a liquid at a set temperature in a short time regardless of the amount of liquid replenished in the container. Further, it is possible to easily identify that the liquid temperature in the divided heating container is in a state in which the liquid at the set temperature can be supplied. When the heating output is further reduced and the temperature of the liquid outside the divided heating container is maintained at a predetermined temperature, a liquid equal to or larger than the capacity of the divided heating container can be supplied at the set temperature. This makes it possible to further increase the liquid temperature rising speed in the divided heating vessels by setting the capacity of the divided heating vessels to the minimum necessary capacity. In addition, even if the temperature detection means for detecting the liquid temperature in the divided heating container has a configuration in which the tracking performance of the liquid temperature is inferior to that of the liquid temperature, the divided temperature is not affected by variations in temperature detection due to radiant heat from the heating means. It is possible to detect that the temperature of the liquid in the heating container has reached a predetermined temperature, and the configuration of the temperature detecting means is simple and accurate.

According to the second aspect of the invention, the liquid is prevented from being inadvertently discharged until the liquid temperature in the divided heating container reaches the predetermined temperature, and only the liquid at the set temperature is reliably supplied. Becomes possible.

According to the third aspect of the present invention, even when the temperature detection means for detecting the liquid temperature in the divided heating container is inferior in the ability to follow the temperature of the liquid and the liquid temperature, it is possible to reduce
After adding the low-temperature liquid, prevent the liquid from being ejected until the liquid temperature in the divided heating container reaches a predetermined temperature,
Only the liquid at the set temperature can be reliably supplied.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an electric water heater according to a first embodiment of the present invention.

FIG. 2 is a diagram showing temperature, time, and each output state indicating temperature control of the electric water heater in Embodiment 1 of the present invention.

FIG. 3 is a block diagram showing an electric water heater according to Embodiments 2 and 3 of the present invention.

FIG. 4 is a diagram showing temperature, time, and each output state showing temperature control of the electric water heater in Embodiment 2 of the present invention.

FIG. 5 is a diagram showing temperature, time, and each output state showing temperature control of the electric water heater in Embodiment 3 of the present invention.

FIG. 6 is a diagram showing temperature, time, and each output state showing temperature control of the electric water heater in Embodiment 3 of the present invention.

FIG. 7 is a block diagram showing an electric water heater according to a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Container 12 Division heating container 13 Heating means 14 Temperature detection means 15 Second temperature detection means 16 Notification means 17 Control means 18 Discharge means 19 Clocking means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-70356 (JP, A) JP-A-6-147642 (JP, A) JP-A-3-111857 (JP, U) JP-A-3-107857 27555 (JP, U) JP 3-107656 (JP, U) JP 2-551 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/21 101 F24H 1/18

Claims (3)

(57) [Claims] 1. A container for storing a liquid, heating means disposed below the container for heating the liquid in the container, a divided heating container for dividingly heating the liquid in the container, and the divided heating container Temperature detection means for detecting the temperature of the liquid in the
Second temperature detecting means for detecting the temperature of the liquid outside the divided heating container, notifying means for notifying an operation state of the device, and the heating means based on the detection results of the temperature detecting means and the second temperature detecting means. And control means for controlling the notifying means, wherein the control means detects the temperature saturation of the liquid in the divided heating container based on the temperature detected by the temperature detecting means.
Then, a notification is made by the notifying means, and when the temperature detected by the temperature detecting means and the second temperature detecting means reaches a predetermined temperature, the heating output of the heating means is reduced, and the liquid outside the divided heating vessel is set to a set temperature. An electric water heater, wherein the heating means is controlled so as to maintain the temperature of the electric heater. 2. A discharge means for discharging a liquid from the divided heating container to detect temperature saturation of the liquid in the divided heating container.
Until knowledge, electric kettle according to claim 1, wherein the prohibiting liquid discharge by the discharging means. 3. When the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature and the temperature detected by the second temperature detecting means is equal to or lower than a predetermined temperature, the liquid discharging by the discharging means is prohibited for a predetermined time, and the heating is performed. The electric water heater according to claim 2 , wherein the electric water heater is continuously heated by the means.