JP3340664B2 - Electric water heater water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for an electric water heater.

[0002]

2. Description of the Related Art In general, a water heater of an electric water heater such as an electric kettle is provided with a container equipped with a heating device housed in an exterior body, and in the middle of a liquid supply passage communicated with the bottom of the container.
A rising portion is provided along the container, a pump is interposed in the middle of the liquid supply passage, and an upper end of the rising portion communicates with the discharge port.

In the beak portion of the above-mentioned exterior body, there are provided lock means such as a hot water supply switch, a lock switch for inhibiting hot water supply, a lock release switch for releasing the inhibition, and the like. A control device for performing predetermined hot water supply control when operated by an operation is provided inside the exterior body.

In the electric water heater provided with the above-described water heater, the liquid enters the rising portion of the liquid supply passage to the same level as the liquid in the container, but the liquid in the rising portion is affected by the heating by the heater. It is difficult to receive hot water in the container, and even if the temperature of the hot water in the container boils, the temperature remains low, so in the initial period when the user operates the hot water supply switch to start hot water supply, low-temperature hot water is discharged and coffee or tea is extracted. May not be performed sufficiently.

In order to eliminate such inconvenience, the present applicant has previously filed a patent application for a water heater of an electric water heater in which hot water is discharged from the beginning of hot water supply (Japanese Patent Application No. 9-96085). . The hot water supply device according to this patent application uses a pump capable of discharging in both forward and reverse directions, such as a screw pump, and a one-way discharge pump, and circulates in a container using a switching device for a liquid supply passage. In any case, when the user desires to discharge hot water from the beginning, a special switch with a display such as "Hot hot" is operated.

When the above switch is operated, the low-temperature hot water in the rising portion of the liquid supply passage flows backward by the reverse rotation of the screw pump, or circulates by the operation of the switching device and the normal rotation of the pump, and the high-temperature water in the container is circulated. Replaced with hot water.

[0007] In the above case, when the replacement of the liquid in the rising portion is completed, the lock is automatically released, and the hot water can be supplied immediately when the user operates the hot water supply switch without operating the lock release switch. It has become.

[0008]

According to the above-mentioned hot water supply apparatus, there is an advantage that hot water can be discharged from the beginning of hot water supply. For this purpose, a user has a special intention display such as a "hot hot" switch. There is an annoyance that it is necessary to operate the special switch, and the number of parts increases due to the need for such a special switch.
There is a problem that the arrangement of components on the operation panel becomes complicated.

Therefore, an object of the present invention is to make it possible to supply hot water as hot as possible at the beginning of hot water supply without providing a special switch as described above.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a container equipped with a heating device, which is housed in an outer package, and is provided in the middle of a liquid supply passage communicating with the bottom of the container. A rising portion is provided along the middle of the liquid supply passage, and a pump of a type capable of discharging in both forward and reverse directions is interposed in the middle of the liquid supply passage, and the upper end of the rising portion is communicated with a discharge port. A hot water supply switch for performing hot water supply by driving, a lock means for prohibiting the hot water supply, and a lock release switch for releasing the above prohibition, and an electric water heater including a control device for performing predetermined hot water supply control are provided. In the hot water supply device, the control device includes:
When the lock release switch is actuated, the hot water in the hot water supply passage is back-flowed and replaced with hot water in the container.

In order to solve the above-mentioned problem, a container equipped with a heating device is housed in an exterior body, and a rising portion is provided along the container in the middle of a liquid supply passage communicating with the bottom of the container. A pump is interposed in the middle of the liquid supply passage, and a switching device provided at an upper end of the rising portion switches between a circulation pipe side and a discharge port side communicating with the container. The body is provided with a hot water supply switch for supplying hot water by driving the pump, a lock means for inhibiting the hot water supply, and a lock release switch for releasing the inhibition, and a control device for performing predetermined control. In the water heater of the electric water heater, when the lock release switch is operated by the control device, the switching device is operated for a predetermined time to move the hot water supply passage toward the circulation pipe. With changing, and by circulating hot water of the hot water supply passage and structure provided with replacement control means to replace the hot water in the container.

In the above case, if the user operates the hot water supply switch while performing the replacement control, a means for stopping the replacement control halfway may be provided. When the replacement control is performed, means for starting an elapsed timer for measuring the elapsed time from that point in time, when the lock release switch is operated within a time equal to or less than a predetermined time by the elapsed timer. It is possible to adopt a configuration in which means for omitting the above replacement control is provided.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As schematically shown in FIG. 1, an electric water heater 1 according to the first embodiment has a container 3 housed in an exterior body 2, and a discharge port 5 in a beak portion 4 of the exterior body 2 from the bottom surface of the container 3. A liquid supply passage 6 is provided in between. A part of the liquid supply passage 6 is provided with a rising part 7 rising from the front side of the container 3 to the exterior body 2, and a pump of a type capable of discharging in both forward and reverse directions below the rising part 7, for example, a screw pump 8 are provided. In the illustrated case, the screw pump 8 is of a horizontal type in which the drive unit is provided below the inner container 3 so that the rotation axis of the screw pump 8 is horizontal. , The pump shaft is inserted into the rising portion 7,
The pump may be of a vertical type in which the above-described pump shaft is connected to a vertical screw provided below the rising portion 7.

The rising portion 7 is formed of a transparent straight pipe, and forms a water level tube by facing the inside of the water level window of the exterior body 2.

A heating device 9 comprising a water heater and a warming heater and a temperature sensor 11 are mounted on the bottom surface of the container 3. Further, a control device 12 for controlling the screw pump 8, the heating device 9, and the like is mounted on a required substrate mounted in the exterior body 2. Further, a hot water supply switch 14 for supplying hot water to the operation panel 13 on the beak portion 4 of the exterior body 2, a lock switch 15 for inhibiting the hot water supply, and a lock release switch 16 for releasing the above inhibition are provided. . Further, a lock release lamp 17 composed of an LED or the like is provided.

The lock switch 15 may be omitted, and the controller 12 may control the hot water supply to be automatically prohibited some time after the hot water supply switch 14 is turned off.

FIG. 2 is a block diagram of a portion of the electric water heater 1 and the control device 12 according to the present invention. In this block diagram, the heating device 9 is shown as being divided into a water heater 18 and a warming heater 19.

The control device 12 has a water heater energizing means 21 composed of a relay switch and a heat retaining energizing means 22 composed of a triac.
Hot water temperature detecting means 23 constituted by a D converter or the like, and pump energizing means 2 constituted by a relay switch or a transistor
0 and a microcomputer 24.

FIG. 3A is a flowchart of the water heater control of the microcomputer 24. When the user operates the lock release switch 16 to turn on the water for hot water supply (step 1), the reverse flow control that reverses the screw pump 8 or repeats the reverse rotation and the normal rotation by the pump energizing means 20 is started (step 1). 2) Replace the low-temperature hot water in the rising portion 7 with the high-temperature hot water in the container 3. In step 3, the lock release lamp 17 is turned on and off. Lock release switch 16 is O
When it becomes FF (step 4), the lock release lamp 17 is turned on (step 5), the backflow control by the screw pump 8 is stopped (step 6), and the flow is terminated.

In FIG. 3B, a 10-second timer is started in step 2, and in step 3, the same reverse flow control of the screw pump 8 by the pump energizing means 20 is performed. Then, regardless of whether or not the user turns off the lock release switch 16, when the 10-second timer expires (step 5), the reverse flow control of the screw pump 8 is stopped (step 7).

In the flowchart of FIG. 4, when the lock release switch 16 is turned on (step 1), it is checked whether or not the 10-minute timer has expired. The 10-minute timer measures the elapse of time from the time when the liquid in the rising portion 7 was replaced by the previous backflow control (see step 8). Although the backflow control is performed (step 3), if 10 minutes have not elapsed, it is considered that the temperature of the hot water in the rising portion 7 has not decreased to the left, so the flow proceeds to step 7 without performing the backflow control. .

However, if the above time has elapsed for 10 minutes or more, the reverse flow control is performed by the screw pump 8 (step 3), and the lock release lamp 17 is turned on and off (step 4). When the user operates the hot water supply switch 14 to turn it on during the above-mentioned reverse flow control, the lock release lamp 17 is turned on (step 7), and the reverse flow control of the screw pump 8 is stopped (step 8). If the hot water supply switch 14 is not turned on, after the 5-second timer expires (step 6), the lighting of the lock release lamp 17 (step 7) and the backflow control are similarly performed (step 8).

Thereafter, the user turns on hot water supply switch 14
(Step 9), the screw pump 8 is rotated forward to supply hot water (step 10).

Since the replacement of the hot water in the rising portion 7 with the high-temperature hot water in the container 3 has been completed at the stage when the backflow control is stopped in step 8, the elapsed time from that point is measured.
In step 11, a 10-minute elapsed timer is started, and as described above, the time until the next time the lock release switch 16 is turned on is counted (step 2). If the time has not passed 10 minutes, it is not performed (step 2).

Next, an electric water heater according to a second embodiment shown in FIG. 5 has the same basic structure as that of the first embodiment, except that a switching device 25 is provided at the upper end of the rising portion 7. A circulation pipe 26 is connected to one outlet of the switching device 25, the circulation pipe 26 is communicated with the upper part of the container 3, and the other outlet of the switching device 25 is connected to the discharge port 5 side, and is operated by an electromagnetic solenoid 27. There is a difference in that the rising portion 7 is switched to the side of the discharge port 5 or the side of the container 3 by the switching valve 28 to be communicated.

It should be noted that a suitable pump such as a centrifugal pump can be used instead of the screw pump 8. Further, the screw pump 8 can be of a vertical type, as in the case described above.

In this case, the lock release switch 16 is
When the pressure reaches N, the electromagnetic solenoid 27 of the switching device 25 is operated to switch the liquid supply passage 6 to the circulation pipe 26 side, and the screw pump 8 is rotated forward to return the low-temperature hot water in the rising portion 7 to the inner container 3. Then, the circulation control for sending out the hot water in the inner container 3 to the rising section 7 is performed for a predetermined time.

Therefore, in the flowchart of the microcomputer in this case, what is referred to as "backflow control" in FIGS. 3 and 4 is simply read as "circulation control". The rest is the same as in the first embodiment, and a description thereof will be omitted.

In any of the above embodiments, replacement control between the low-temperature hot water in the rising portion 7 and the high-temperature hot water in the container 3 (backflow control in the first embodiment, circulation control in the second embodiment). Is performed after boiling, but the microcomputer 24 uses the temperature sensor 11 to detect the temperature for controlling the heat retention temperature after the boiling is completed. That is, in FIG. 6 (a), the temperature sensor 11 detects the boiling temperature (100 ° C.) at the time T ₁ , reduces the heater power (985 W) to the heat retaining power (91 W), and until the time T ₂ (about 6 min) performs replacement control S described above is performed by the temperature sensor 11 the temperature detection for thermal insulation the temperature control at time T _2.

However, in the above replacement control, since the low-temperature hot water of the rising portion 7 enters the inner container 3, the temperature sensor 11 may detect a temperature lower than the hot water temperature at the time of equilibrium. Then, although the temperature of the hot water in the inner container 3 is actually considerably high, the temperature detecting means 23 detects that the temperature is lower than the actual temperature. Inconvenient problems occur.

For this reason, as shown in FIG. 6 (b), at time T ₀ when the temperature becomes relatively high (eg, 90 ° C.) before reaching boiling, the first replacement control S ₁ is performed for a predetermined time. Then, if the _second replacement control S ₂ is performed between the times T ₁ and T ₂ after the boiling, the second replacement control S _2
In the case of _{2, since} the temperature of the hot water in the rising portion 7 has risen to about 90 ° C., the temperature of the heat retention temperature control is hardly affected.

[0032]

As described above, according to the present invention, when the lock release switch provided for the safety of the hot water supply operation is operated, the low temperature hot water in the rising portion is replaced with the high temperature hot water in the container. That is, hot water can be discharged from the beginning of hot water supply without providing a special switch.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an electric water heater according to a first embodiment.

FIG. 2 is a control block diagram of the above.

FIGS. 3A and 3B are flow charts of the above.

FIG. 4 is a flowchart of another example of the above.

FIG. 5 is a schematic diagram of an electric water heater according to a second embodiment.

6 (a) and 6 (b) are diagrams showing the relationship between time, hot water temperature and heater power.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric water heater 2 Exterior body 3 Container 4 Beak part 5 Discharge port 6 Liquid supply passage 7 Rise part 8 Screw pump 9 Heating device 11 Temperature sensor 12 Control device 13 Operation panel 14 Hot water supply switch 15 Lock switch 16 Lock release switch 17 Lock release lamp REFERENCE SIGNS LIST 18 hot water heater 19 warming heater 20 pump energizing means 21 hot water energizing means 22 warming energizing means 23 hot water temperature detecting means 24 microcomputer 25 switching device 26 circulation pipe 27 electromagnetic solenoid 28 switching valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Yamane 1-20-5 Tenma, Kita-ku, Osaka Zojirushi Ma Hobin Co., Ltd. (56) References JP-A-5-309039 (JP, A) JP-A Heisei 9-313353 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/21

Claims (2)

(57) [Claims] 1. A container equipped with a heating device is housed in an exterior body, and a rising portion along the container is provided in a liquid supply passage communicating with a bottom portion of the container. With a pump that can discharge to
A hot water supply switch for supplying hot water to the exterior body by driving the pump, a lock unit for prohibiting the hot water supply, and a lock for releasing the prohibition, by connecting the upper end of the rising portion to a discharge port. A release switch is provided,
In a water heater of an electric water heater having a control device for performing a predetermined hot water supply control, in the control device, when the lock release switch is operated, the hot water in the hot water supply passage is caused to flow backward to the hot water in the container. A replacement control means for causing replacement is provided , and replacement control is performed by the replacement control means.
Time to measure the time elapsed since that point.
Means to start the immer, by the above timer
The lock release switch must be set within the specified time.
Means is provided to omit the replacement control when
Hot water supply device for an electric kettle, characterized in that digit. 2. A container equipped with a heating device is housed in an outer package, a rising portion is provided along the container in a liquid supply passage communicating with the bottom of the container, and a pump is interposed in the liquid supply passage. In addition, the switching device provided at the upper end of the rising portion switches between the circulation pipe side and the discharge port side communicating with the container, and performs hot water supply by driving the pump to the exterior body. A hot water supply switch, a lock means for prohibiting the hot water supply, and a lock release switch for releasing the above-mentioned prohibition, and a water heater for an electric water heater comprising a control device for performing a predetermined control; When the lock release switch is actuated, the switching device is operated for a predetermined time to switch the hot water supply passage to the circulation pipe side and circulate hot water in the hot water supply passage. Replacement control means is provided for replacing the hot water in the container , and the replacement control means performs the replacement control.
To measure the elapsed time from that point
Means to start the elapsed timer, the above elapsed timer
The lock release time is set within the specified time.
When the switch is operated,
A water heater for an electric water heater, comprising a step .