JP2579612B2 - Hot water storage type electric 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 an improvement of a hot water storage type electric water heater in which hot water is heated and stored by electric power at night or the like.

[0002]

2. Description of the Related Art A hot water storage type electric water heater is an electric water heater which uses cheap electric power in a specific time zone at night to heat and store hot water at night and use it for daytime use. Is being used.

FIG. 8 is a block diagram showing an example of a conventional hot water storage type electric water heater. The power is supplied to the power supply terminal 31 by a night power time switch (not shown) which is turned on when the power is supplied during the night power supply time period. An electric heater 34 is connected to the power supply terminal 31 via an open / close contact 33 that is turned on and off by an output unit 32. When power is supplied to the power supply terminal 31, a time zone detection unit 35 is connected. Detects this and inputs it to the calculating means 36. The calculating means 36 calculates the energization start time based on the set boiling temperature condition by the setting means 37, the remaining hot water amount by the temperature sensor 38, the water supply temperature, and the like.
And turning on / off contact 33 via output means 32,
When the temperature reaches the boiling temperature, the open / close contact 33 is turned off to control the energization of the electric heater 34.

[0004] In addition, even in the daytime period other than the nighttime power supply time period, the operation means 36 constantly detects the water temperature and the remaining hot water amount at predetermined time intervals, and displays the remaining hot water amount on the display control means 40 and the display means. 41. Therefore, a control power supply terminal 42 and a control power supply unit 43 to which power is constantly supplied are provided.

[0005] The AD converter 44 converts the analog value detected by the temperature sensor 38 into a digital signal at predetermined time intervals in accordance with a command from the calculating means 36 and inputs the digital signal to the calculating means 36.

A first memory 45 stores various operation commands of the arithmetic means 36, a water temperature value, and the like, and a second memory 46 stores a control pattern of the set boiling temperature, a boiling temperature corresponding to the feed water temperature, and the like. Remember.

[0007]

In such a conventional hot water storage type electric water heater, an output means 32 is provided between an electric heater 34 for boiling hot water and a power supply terminal 31 by a computing means 36 using a microprocessor or the like. An opening / closing contact 33, which is controlled to open / close (on / off) via a switch, is inserted. If an abnormality occurs in the calculating means 36 for some reason, the hot water storage type is maintained until the repairing of the calculating means 36 is completed. The electric water heater cannot be used at all, which causes a great inconvenience to the user.

An object of the present invention is to solve the above-mentioned problems and to provide a hot water storage type electric water heater capable of boiling hot water even when an abnormality has occurred in the arithmetic means.

[0009]

According to the first aspect of the present invention, there is provided a temperature sensor for detecting the temperature of water or hot water in a hot water storage tank.
To the electric heater based on the information from the temperature sensor.
Calculation means for calculating the energization of the
Open / close with the electric heater at the power supply terminal to which power is supplied
A heater formed by connecting contacts in series
A main circuit and the switching contact according to the output of the arithmetic means.
A hot water storage type water heater equipped with an output means for turning on and off
Oite, monitors the operation of the operation means, monitoring means for detecting an abnormality, a second <br/> switching contacts to be inserted into and connected to the heater main circuit, alternative the calculating means and the output means of which may be functional, and auxiliary temperature control means are separately provided, if the superintendent <br/> vision means does not detect the abnormality, connected in series to switching contacts of the output means to the electric heater, the monitoring If the means detects an abnormality, as well as disconnecting the switching contacts of the output means from the electric heater, the auxiliary temperature control means
Main heater for connecting the second switching contact to the electric heater in series
Circuit switching means is provided .
You .

The present invention according to claim 2 is a hot water storage tank.
A temperature sensor for detecting the temperature of water or hot water in the
Power to the electric heater based on the information from the temperature sensor.
Operation means for performing calculations for
The electric heater and the switching contacts are
A heater main circuit formed by being connected to the column;
ON / OFF of the switching contact according to the output of the calculating means
In the hot-water storage type electric water heater provided with
Serial has a second switching contact which is connected by the heater main circuit switching contact in series with said output means, to said calculation means and the output means may be substituted, except that a high boiling temperature setting A function of separately provided auxiliary temperature control means,
Monitors the operation of the operation means, when an abnormality is detected and is characterized in that a monitoring means for forcibly turning on the switching contacts of the output means.

[0011]

[Action] In the present invention according to claim 1, wherein when an abnormality occurs in the operation of the operation means, to detect this by monitoring means, heat
It is switched to an auxiliary temperature control unit in place of the calculating means and the output means by the operation of the switching means of chromatography data main circuit, electrical
A second temperature control means connected in series to the heater;
The hot water is heated with electric power in a specific time zone by turning on and off the switching contacts.

According to the second aspect of the present invention, when an abnormality occurs in the operation of the arithmetic unit, the abnormality is detected by the monitoring unit, and the open / close contact of the output unit is forcibly turned on. The on / off state of the second switching contact of the auxiliary temperature control means instead of the output means is in a state where the energization to the electric heater can be controlled, and is connected in series to the electric heater.
By turning on and off the second switching contact of the auxiliary temperature control means, the hot water is heated with electric power in a specific time zone .

[0013]

FIG. 1 is a block diagram of a hot-water storage type electric water heater according to a first embodiment of the present invention. An electric heater 5 is connected to the power supply terminal 1 via a contact 2 a of the switching means 2 and an open / close contact 4 of the output means 3. When power is supplied to the power supply terminal 1, the time zone detecting means 6 detects this and inputs it to the calculating means 7 using a microprocessor or the like. The calculating means 7 calculates the energization start time based on the set boiling temperature condition by the setting means 8, the remaining hot water amount by the temperature sensor 9, the water supply condition, and the like. When the energization start time comes, the output control means 10 (such as a transistor) and the output The means 3 (coil of the relay) turns on the open / close contact 4 and starts energization of the electric heater 5. When the temperature reaches the boiling temperature, the calculating means 7 turns off the switching contact 4 via the output control means 10 and the output means 3. Thus, the water in the hot water storage tank (not shown) boils to a predetermined temperature.

The calculating means 7 constantly detects the remaining hot water amount in addition to the water temperature at predetermined time intervals, and causes the display control means 11 and the display means 12 to display the remaining hot water amount. Therefore, the control power supply terminal 13 and the control power supply unit 14 to which power is constantly supplied are provided.

The temperature sensor 9 measures the water temperature or the water temperature at a plurality of levels in the hot water tank. A signal from the temperature sensor 9 is output at predetermined time intervals according to a command from the arithmetic means 7.
The data is converted into a digital value by the converter 15 and
Sent to The calculating means 7 detects the water temperature and the amount of remaining hot water in the hot water storage tank based on the information of the water temperature or the hot water temperature at a plurality of levels from the temperature sensor 9. Turn on contact 4,
It turns off the power supply to the electric heater 5 to boil the water in the hot water tank to a predetermined temperature, and the display control means 11
The required information such as the amount of remaining hot water is displayed on the display means 12 constituted by a light emitting diode, a liquid crystal display and the like via the.

The first memory 16 stores various operation commands of the calculating means 7 and the water temperature, and the second memory 17 stores the control pattern of the boiling temperature set by the setting means 8 and the boiling temperature for the feed water temperature. The temperature and the like are stored.

The arithmetic means 7, the output control means 10, the display control means 11, the AD converter 15, the first memory 16, and the second memory 17 are usually constituted as one microcomputer.

The monitoring means 18 constantly monitors the operation of the arithmetic means 7. The arithmetic means 7 is programmed to generate a pulse having a constant cycle when the sequence program is operating normally. Therefore, when the arithmetic means 7 is operating normally, the pulse having the fixed cycle is generated. The monitoring means 18 outputs a watchdog timer 19 having a fail-safe function to reset the system when the arithmetic means 7 runs away (FIG. 2).
, This pulse is constantly monitored.

FIG. 2 is a block diagram showing a configuration example of the monitoring means 18. If the generated pulse period is disturbed due to a runaway phenomenon of the arithmetic means 7 or no pulse is generated due to an abnormality of the arithmetic means 7, the watchdog timer 19 of the monitoring means 18 determines that an abnormality has occurred, and the built-in oscillator A reset pulse is generated and sent to the arithmetic means 7 to restart the sequence program of the arithmetic means 7. If the calculating means 7 still does not generate a normal pulse with a constant period, the monitoring means 18 sends a reset pulse to the calculating means 7 again, and starts the sequence program of the calculating means 7 again. The reset pulse is set so as to be transmitted at a predetermined cycle.

The monitoring means 18 counts the reset pulses by the counting section 20. If the operation of the calculating means 7 does not return to normal even after a predetermined number of reset operations, a signal is sent from the counting section 20 to the holding section 21. And the holding unit 21 outputs a switching signal to the switching unit 2 as an output of the monitoring unit 18,
The switching means 2 constituted by a relay or the like is forcibly operated, the movable contact piece 2c of the switching means 2 is switched to the contact 2b side, the temperature control by the on-off contact 4 is stopped, and the contact 2b
The temperature is controlled by a bimetal type thermostat 22 (corresponding to the auxiliary temperature control means of the present invention) connected to the power supply. This makes it possible to boil the hot water by the same temperature control as usual. The bimetal thermostat 22 includes a temperature control unit 23 surrounded by a dotted line in FIG.
It has a function that can be substituted.

FIG. 3 is a block diagram of a hot water storage type electric water heater which is a modification of the first embodiment of the present invention. In this modification, the opening and closing of the auxiliary temperature control means which is switched by the switching means 2 is shown. As a contact, an open / close contact 24 is provided instead of the bimetal thermostat 22 of FIG. 1, and an auxiliary temperature control means 25 having exactly the same configuration as the temperature control means 23 surrounded by a dotted line in FIG.
Temperature control means 23.
And the temperature sensor 9 and the two sets of the auxiliary temperature control means 25 and the temperature sensor 26 are always operated simultaneously and concurrently. This increases the cost as compared with the case where the bimetal thermostat 22 as shown in FIG. 1 is used. However, even when the temperature control means 23 becomes abnormal, the hot water is controlled by the same temperature control as in the normal state. Boiling can be performed.

FIG. 4 is a block diagram of a hot-water storage type electric water heater according to another modification of the first embodiment of the present invention.
In this modification, similarly to the time zone detecting means 6, the temperature control means 23 and the auxiliary temperature control
Is different from the example of FIG.
The rest is exactly the same as in the example of FIG.

As described above, the temperature control means 23, the bimetal thermostat 22 or the auxiliary temperature control means 25 as auxiliary temperature control means, the switching contact 4 and the bimetallic thermostat 22 or the switching contact 24 are provided in duplicate. These are arranged in parallel, and when the arithmetic means 7 is abnormal, the temperature control operation by the combination of the temperature control means 23 and the switching contact 4 is performed by the combination of the bimetal thermostat 22 or the auxiliary temperature control means 25 and the switching contact 24. For example, by forcibly switching to the temperature control operation based on the above, it is possible to prevent the user using the hot water storage type electric water heater from being inconvenienced by the fact that the hot water does not boil.

FIG. 5 is a block diagram of a hot water storage type electric water heater according to a second embodiment of the present invention. An electric heater 5 is connected to the power supply terminal 1 via an opening / closing contact 4 of an output means 3 and a bimetal thermostat 22 serving as an auxiliary temperature control means. Power supply terminal 1
Is supplied with power, the time zone detecting means 6 detects this and inputs it to the calculating means 7. The calculating means 7 calculates the energization start time based on the set boiling temperature condition by the setting means 8, the remaining hot water amount by the temperature sensor 9, the supply water temperature, and the like. The switching contact 4 is turned on via the means 3 (coil of the relay), and the energization of the electric heater 5 is started.
When the temperature reaches the boiling temperature, the calculating means 7 turns off the switching contact 4 via the output control means 10 and the output means 3. Thus, the water in the hot water storage tank (not shown) boils to a predetermined temperature.

The calculating means 7 always detects the remaining hot water amount in addition to the water temperature at predetermined time intervals, and causes the display control means 11 and the display means 12 to display the remaining hot water amount. Therefore, the control power supply terminal 13 and the control power supply unit 14 to which power is constantly supplied are provided.

The temperature sensor 9 measures the water temperature or the water temperature at a plurality of levels in the hot water tank. A signal from the temperature sensor 9 is output at predetermined time intervals by an instruction from the arithmetic means 7
The data is converted into a digital value by the converter 15 and sent to the calculating means 7. The calculating means 7 detects the water temperature and the amount of remaining hot water in the hot water storage tank based on the information of the water temperature or the hot water temperature at a plurality of levels from the temperature sensor 9. The contact 4 is turned on and off to control the energization of the electric heater 5 to boil the water in the hot water tank to a predetermined water temperature, and to provide the display means 12 with necessary information such as the amount of remaining hot water via the display control means 11. Display.

The first memory 16 stores various operation commands of the arithmetic means 7 and the water temperature. The second memory 17 stores the control pattern of the boiling temperature set by the setting means 8 and the boiling temperature for the feed water temperature. The temperature and the like are stored.

The arithmetic means 7, output control means 10, display control means 11, AD converter 15, first memory 16 and second memory 17 are usually constituted as one microcomputer.

The monitoring means 18 constantly monitors the operation of the arithmetic means 7. If the pulse period generated by the runaway phenomenon of the arithmetic means 7 is disturbed, or no pulse is generated due to the abnormality of the arithmetic means 7, the monitoring means 18 determines that the arithmetic means 7 is abnormal, and A reset pulse is sent out to restart the sequence program of the arithmetic means 7. If the calculating means 7 still does not generate a normal pulse with a constant period, the monitoring means 18 sends a reset pulse to the calculating means 7 again, and starts the sequence program of the calculating means 7 again. If the operation of the calculating means 7 does not return to normal even after a predetermined number of reset operations, the monitoring means 18 sends a signal directly to the output means 3 to operate it, and forcibly turns on the on / off contact 4. By doing so, the operation is changed to the operation of boiling the hot water storage tank by the bimetallic thermostat 22.

In this case, the bimetal thermostat 2
In the temperature control by the method 2, the boiling temperature of the hot water is set higher than the boiling temperature by the temperature control means 23. In a normal temperature control state, the bimetal thermostat 22 is always on, so Has no effect on the operation. Therefore, when the arithmetic means 7 becomes abnormal, the temperature of the hot water in the hot water tank is heated to a higher temperature than in a normal case.

FIG. 6 is a block diagram of a hot-water storage type electric water heater which is a modification of the second embodiment of the present invention. In this modification, the switching contact of the auxiliary temperature control means of FIG. A switching contact 24 is provided in place of the bimetallic thermostat 22, and the auxiliary temperature control means 2 has exactly the same configuration as the temperature control means 23 surrounded by a dotted line in FIG.
5, the open / close contact 24 is controlled, and two sets of the temperature control means 23 and the temperature sensor 9 and the auxiliary temperature control means 25 and the temperature sensor 26 are always operated simultaneously and concurrently. The set boiling temperature of the auxiliary temperature control means 25 is determined by the temperature control means 23.
It is set higher than that of. This increases the cost as compared with the case of using a bimetal type thermostat 22 as shown in FIG.
Even in the case where 3 is abnormal, the same temperature control as in the normal state can be performed except that the boiling temperature becomes high.

FIG. 7 is a block diagram of a hot-water storage type electric water heater according to another modification of the second embodiment of the present invention.
In this modification, similarly to the time zone detecting means 6, the temperature control means 23 and the auxiliary temperature control
Is different from the example of FIG.
The rest is exactly the same as in the example of FIG.

As described above, the temperature control means 23, the bimetal type thermostat 22 or the auxiliary temperature control means 25 as the auxiliary temperature control means, the switching contact 4 and the bimetal type thermostat 22 or the switching contact 24 are doubly provided. These are arranged in series, and when the arithmetic means 7 is abnormal, the temperature control operation by the combination of the temperature control means 23 and the switching contact 4 is performed by the combination of the bimetal thermostat 22 or the auxiliary temperature control means 25 and the switching contact 24. By changing the temperature control operation to the temperature control operation, it is possible to prevent a user who uses the hot water storage type electric water heater from being inconvenienced by the fact that hot water does not boil.

[0034]

As described above, according to the first aspect of the present invention, when an abnormality occurs in the calculating means,
Even automatically and immediately detect this,
Hot water can be heated by the control means. Yo
Thus, running out of hot water can be prevented, and convenience can be improved. Special
Since the water is heated using electric power during a specific time,
Boiling hot water even if abnormalities are found during off-hours
It is impossible to detect abnormalities immediately,
It is important in preventing it. Also, to repair abnormalities
Even if the calculation means and output means are removed,
Normal temperature by the auxiliary temperature control means and the second switching contact
The water can be boiled as well. Further, output means
And the second switching contact of the auxiliary temperature control means.
The switching contact of the output means is welded because it is provided in the heater main circuit
Opening and closing of the auxiliary temperature control means even if
Can be replaced by contacts and has double safety
be able to.

According to the present invention described in claim 2,
Even when an abnormality occurs in the arithmetic means, it is automatically and automatically performed.
This is immediately detected and the auxiliary temperature control means
Can be boiled. Therefore, prevention of running out of hot water
And convenience can be improved. In particular, at specific times
Since the water is heated using electric power,
It is impossible to boil hot water even if you discover an abnormality,
Immediate detection of abnormalities is important to prevent running out of hot water
It is. In addition, switching contact of output means and temperature control for auxiliary
Since the second switching contact of the means is provided in the heater main circuit,
Even if the switching contact of the force means welds,
To the electric heater by the second switching contact of the temperature control means
Can be turned on and off, providing dual security.
Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hot water storage type electric water heater according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a monitoring unit in FIG. 1;

FIG. 3 is a block diagram of a hot water storage type electric water heater, which is a modification of the first embodiment of the present invention.

FIG. 4 is a block diagram of a hot-water storage type electric water heater, which is another modification of the first embodiment of the present invention.

FIG. 5 is a block diagram of a hot water storage type electric water heater according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a hot water storage type electric water heater, which is a modification of the second embodiment of the present invention.

FIG. 7 is a block diagram of a hot water storage type electric water heater, which is another modification of the second embodiment of the present invention.

FIG. 8 is a block diagram showing an example of a conventional hot water storage type electric water heater.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Power supply terminal 2 Switching means 2a, 2b Contact 2c Movable contact piece 3 Output means 4 Opening / closing contact 5 Electric heater 6 Time zone detection means 7 Calculation means 8 Setting means 9 Temperature sensor 10 Output control means 11 Display control means 12 Display means DESCRIPTION OF SYMBOLS 13 Control power supply terminal 14 Control power supply unit 15 AD converter 16 1st memory 17 2nd memory 18 Monitoring means 19 Watchdog timer 20 Counting unit 21 Holding unit 22 Bimetal type thermostat (auxiliary temperature control means) 23 Temperature control means 24 switching contact 25 auxiliary temperature control means 26 temperature sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Watanabe 2-7-1, Higashi-Gotanda, Shinagawa-ku, Tokyo Inside Osaki Electric Industry Co., Ltd. (72) Inventor Nozomi 2-2-2, Higashi-Gotanda, Shinagawa-ku, Tokyo No. Osaki Electric Industry Co., Ltd. (56) References JP-A-4-93554 (JP, A) JP-B-54-25659 (JP, B2)

Claims (2)

(57) [Claims] [1 claim: a temperature sensor for detecting the temperature of the water or hot water in the hot water storage tank, a calculation means for performing calculation for the energization of the electric heater based on information from the temperature sensor, the specific
The electric power supply terminal to which power is supplied
Is formed by connecting the
A heater main circuit, on the <br/> switching contacts in response to an output of said arithmetic means, in the hot-water storage type electric water heater having an output means for off, monitors the operation of the operation means, an abnormality Monitoring means for detecting , inserted and connected to the heater main circuit;
A second switching contact which, functions that may be substituted for the said calculating means and output means, an auxiliary temperature control unit which is separately provided, when the monitoring means detects no abnormality, the output means An on / off contact is connected in series with the electric heater, and when the monitoring means detects an abnormality, the on / off contact of the output means is disconnected from the electric heater, and the second on / off contact of the auxiliary temperature control means is electrically connected. A hot-water storage type electric water heater comprising a heater main circuit switching means connected in series to the heater . [2 claim] a temperature sensor for detecting the temperature of the water or hot water in the hot water storage tank, a calculation means for performing calculation for the energization of the electric heater based on information from the temperature sensor, the specific
The electric power supply terminal to which power is supplied
Is formed by connecting the
A heater main circuit, on the <br/> switching contacts in response to an output of said arithmetic means, in the hot-water storage type electric water heater having an output means for off, opening and closing of said output means by said heater main circuit A second switching contact connected in series with the contact,
The operation means and the output means are monitored separately for the auxiliary temperature control means and the operation of the calculation means, which are functions that can be replaced except that the set boiling temperature is high. And a monitoring means for forcibly turning on an open / close contact of the output means when an abnormality is detected.