JPH01222156A - Automatic hot-water supplier provided with function of stopping hot-water filling in abnormal conditions - Google Patents

Abstract

PURPOSE:To stop the supply of hot-water automatically, by a method wherein the ON time of a solenoid valve is accumulated by a solenoid valve ON accumulating timer while the solenoid valve is put OFF to blockade the flow passageway of hot-water after a given hot-water filling time has elapsed. CONSTITUTION:When the value of a measured supplying hot-water temperature is higher than a bath operation permitting temperature, a three-way changeover valve 17 and a solenoid valve 22 are put ON. Simultaneously with the operation of the solenoid valve 22, a solenoid valve ON accumulating timer is operated to accumulate the ON time of the solenoid valve 22 while the solenoid valve 22 is put OFF after a predetermined time has elapsed and a circulating pump 18 is put ON. At the same time, an alarm lamp is lighted. The solenoid valve 22 and/or the circulating pump 18 are prevented from holding the ON conditions thereof due to the troubles of a water amount sensor 25 or a hot-water filling pipeline 20 or the forgetting of the closing of a water discharging cock for a bathtub 16 while the hot-water filling operation may be stopped quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a one-can, two-channel type automatic water heater in which the same water heater is connected to a bathtub through a circulation channel and a hot water filling channel.

(b) Prior Art Conventionally, as one type of automatic water heater, there is the above-mentioned one-can, two-channel automatic water heater.

In such an automatic water heater, a heat exchanger in the water heater main body is connected to the bathtub through outgoing piping and incoming piping to form a circulation flow path, and the circulation flow path is placed midway through the outgoing piping. A pump is provided, and one end of a separately provided hot water piping is connected to the heat exchanger, and the other end is connected to a portion of the outgoing piping upstream of the circulation pump via a three-way switching valve, Furthermore, a mixing valve is provided in the middle of the hot water filling piping, and a hot water filling flow path is provided separately in addition to the circulation flow path.

In addition, with this configuration, hot water filling work, boiling,
Heat insulation work etc. can be performed in the following manner.

In other words, when filling hot water, the three-way switching valve is driven to switch the hot water supply flow path from the circulation flow path to the hot water filling flow path, and the high temperature hot water generated in the water heater body is fed to the mixing valve to mix the water and maintain the appropriate temperature. This is done by generating hot water (for example, 38°C) and discharging the appropriate amount of hot water into the bathtub through the hot water filling pipe, the three-way switching valve, and the outgoing hot water supply pipe. Then, when the amount of hot water reaches a preset amount using a controller or the like, the circulation pump automatically stops and the hot water supply stops, completing the hot water filling operation.

After that, boiling and keeping warm will be carried out,
This work involves driving the three-way switching valve to switch the hot water supply flow path from the hot water filling flow path to the circulation flow path, and discharging the high temperature hot water that has been heat exchanged in the water supply #i machine body through the outgoing piping into the bathtub. This is done by forming a circulation flow by returning the bath water to the heat exchanger through the return piping and raising the bath temperature in the bathtub to the set temperature. When the set temperature is reached, the circulation pump is automatically stopped and circulation is stopped, completing the boiling and warming work.

(c) Problems to be Solved by the Invention However, such conventional automatic water heaters still have the following problems.

In other words, hot water filling work usually ends by supplying a certain amount of hot water into the bathtub, but this supply amount may be set in advance or specified by the bather each time the bathtub is filled with hot water. When the set or designated amount is reached, the filling process will automatically end.

However, if there is a failure in the water flow sensor that detects the set or specified amount, a failure in the hot water piping, or a forgetting to close the bathtub drain valve, the solenoid valves and circulation pumps will not be able to continue filling with hot water. This means that the operation of
The flow of wasted hot water causes forgiveness.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water filling stop device for an automatic water heater that can solve the above-mentioned problems.

(d) Means for solving the problem The present invention connects the heat exchanger and the bathtub in communication with an outgoing piping and an incoming piping with a circulation pump interposed in the middle to form a circulation flow path, The hot water filling pipe for supplying mixed hot water for hot water filling is branched and communicated with the outgoing pipe on the upper side of the circulation pump via a three-way switching valve to form a hot water filling flow path.
In an automatic water heater with two cans and channels, a solenoid valve is installed in the middle of the hot water filling flow path and is linked to a solenoid valve-on integration timer. The system is configured so that the hot water filling channel is automatically closed when the water is opened and a certain amount of hot water is supplied, and a solenoid valve on integration timer is used to accumulate the on time of the solenoid valve and after a certain amount of hot water filling time has elapsed. This relates to an automatic water heater having a function of stopping hot water filling in the event of an abnormality, which is configured to close a hot water filling channel by turning off a solenoid valve.

(e) Action and effect With the above configuration, the present invention has the following effects.

According to this invention, when supplying hot water to the bathtub from the hot water filling channel in order to fill the bathtub with hot water, the solenoid valve or three-way switching valve installed in the middle is turned on and the hot water filling operation is performed. When a constant flow of hot water is supplied to the bathtub, the flow rate of the hot water is detected and the hot water filling channel is closed, and the hot water filling work is completed.
If for some reason, for example, the water flow sensor that detects the flow rate malfunctions, hot water filling control based on the flow rate cannot be performed.In this case, the solenoid valve on integration timer linked to the solenoid valve is used to detect the cumulative amount of hot water filling time. After a certain period of time has elapsed, the hot water filling flow path is blocked and hot water filling is stopped. Therefore, even if hot water filling cannot be controlled by flow rate due to a malfunction of the water flow sensor, etc., hot water will continue to flow. Instead, if the hot water is left running for a certain period of time, the supply of hot water for filling the bath can be automatically stopped, allowing you to conserve hot water.

(f) Examples The present invention will be specifically described below based on examples shown in the attached drawings.

FIG. 1 shows the conceptual overall configuration of an automatic water heater A according to the present invention, and in the figure, IO is a main body of the water heater, which is equipped with a heat exchanger 11 and an oil burner 12.

A water supply pipe 13 and a hot water supply pipe 14 are respectively connected to the heat exchanger 11, and tap water is supplied into the outer can 11b of the heat exchanger 11 through the water supply pipe 13, while the hot water supply pipe 14
Through this, hot water will be delivered to a sink, shower, etc. (not shown).

In FIG. 1, reference numeral 15 has a starting end connected to the inner pipe 11a of the heat exchanger 11, a terminal end connected to the bathtub 16, and a three-way switching valve 17 and a circulation pump 1 in the middle thereof.
Reference numeral 8 denotes an outbound piping, and 19 denotes a return piping whose starting end is connected to the bathtub 16 and whose terminal end is connected to the inner pipe 11a of the heat exchanger 11.

With this configuration, the heat exchanger 11-outgoing pipe 15-
A circulation flow path B can be formed from the bathtub 16, the return pipe 19, and the heat exchanger 11, and by driving the circulation pump 18, the bath in the bathtub 16 is circulated within the circulation flow path B. The bath can be continuously heated by the heat exchanger 11 to boil the bath and keep it warm.

In addition, in FIG. 1, 20 is a hot water filling pipe whose starting end is branched from the hot water supply pipe 14, and the ending end of the hot water filling pipe 20 is a mixing valve 21, a solenoid valve 22, a ball tap 23, a cistern 24, and a water flow sensor. 25, it is communicatively connected to the three-way switching valve 17.

With this configuration, by switching the three-way switching valve 17 and connecting the terminal end of the hot water filling pipe 20 and the upstream side of the outgoing pipe 15, the heat exchanger 11 -> mixing pulp 21 - solenoid valve 22 - ball tap 23 - distern 24
→Water flow sensor 25-4 Three-way switching valve 17-Outbound pipe 15
A hot water filling channel C consisting of - circulation pump 18 - bathtub 16 can be formed.

Note that from the outer can 11b of the heat exchanger 11, there is a hot water filling channel C.
Since the heat exchange capacity of the heat exchanger 11 is large, a large amount of hot water flowing through the heat exchanger 11 can be supplied in a short period of time.On the other hand, the heat exchange capacity of the inner tube 11a of the heat exchanger 11 is small.

Note that 26 is a branch water supply pipe provided between the mixing valve 21 and the water supply pipe 13 to supply water to the mixing valve 21.

With this configuration, if the three-way switching valve 17 is switched to connect the hot water filling distribution 20 to the upstream side of the outgoing pipe 15 and then the circulation pump 18 is driven, the high temperature hot water from the heat exchanger 11 is transferred by the mixing valve 21. Branch water supply pipe 26
The mixed hot water is mixed with the water from the bathtub to generate mixed hot water at an appropriate temperature, and the mixed hot water is discharged into the bathtub 16 via the hot water filling pipe 20, the three-way switching valve 17, the outgoing pipe 15, and the circulation pump 18. Become.

Further, to explain other configurations in the illustrated embodiment, 27 is a lower limit float switch, which is used to ensure a certain amount of mixed hot water in the distern 24 and prevent the generation of drawing noises, etc. On the other hand, 28 is an upper limit float switch, which was originally the ball tap 23.
This is to prevent overflow from the distiller 24 in the event that the ball tamp 23 breaks down.

Further, 29 is a bath temperature sensor provided on the return side piping 19 of the circulation flow path B, and is used to measure the bath temperature of the bathtub I6. On the other hand, 30 is a heat exchanger 11 of the water heater main body 10.
This is a hot water supply temperature sensor disposed inside the heat exchanger 11, and measures the temperature of high temperature hot water generated inside the heat exchanger 11.

Furthermore, in FIG. 1, 31 is a control device, and the control device 31, as shown in FIG.
It is composed of a memory 34 consisting of an OM and a RAM.

In the above configuration, the input interface 32
The water level sensor 25. Lower limit float switch 27. Upper limit float switch 28. A bath water temperature sensor 29 and a hot water supply temperature sensor 30 are connected.

On the other hand, the output interface 33 includes a three-way switching valve 17.
．． Circulation pump 18. Mixing valve 21. A refueling pump SP and a solenoid valve 22 are connected.

The memory 34 also includes the various sensors 25, 27, etc. described above.
．． The three-way switching valve 17. Circulation pump 18. Mixing valve 21. A drive sequence program for driving the oil supply pump SP, solenoid valve 22, etc. is stored, and as described later, when an interrupt operation occurs during the main routine, the immediately preceding operating conditions or hot water dispensing conditions are stored. Can be memorized.

Next, the controllers 35 and 36 for manually sending drive output to the control device 31 will be explained.

In FIG. 1, a main controller 35 is installed in a kitchen or the like and is a controller that specifically instructs conditions for dispensing hot water to a bathtub 16, and a subcontroller 36 is a controller that is installed in a kitchen etc.
This is a controller installed near the bathtub 16 to instruct simple hot water supply conditions to the bathtub 6.

By operating these controllers 35 and 36, a predetermined drive signal or control signal is sent to the control device 31, and based on the drive signal, the oil burner 12 (including the oil supply pump SP), 'three-way switching Valve 17. Circulation pump 18. The mixing valve 21, the electromagnetic valve 22, etc. can be driven.

A specific configuration of the main controller 35 and sub-controller 36 shown in FIGS. 2 and 3 is shown.

In this embodiment, the main controller 35 includes, as shown in FIG. 2, an operation switch 40, a hot water filling switch 41, a boiling/warming switch 42, a hot water papier-mâché switch 43, and a freeze prevention switch 44. It is equipped with a child lock switch 45.

When the operation switch 40 is turned on, all the controllers 35, 36, the control device 31, the oil burner 12 (including the oil supply pump SP), the three-way switching valve 17. Circulation pump 18. Various driving devices such as the mixing valve 21 and the solenoid valve 22, and the water amount sensor 25. 'Lower limit float switch 27. Upper limit float switch 28. Power can be supplied to various sensors such as the bath water temperature sensor 29 and the hot water supply temperature sensor 30.

Further, 40a and 46a are operation display lamps that light up when the operation switch 40 is turned on, and 41a and 47a are
Hot water filling indicator lamps, 42a and 48a are boiling and heat retention indicator lamps, 43f is a hot water filling reservation indicator lamp, 44
49a is a freeze prevention indicator lamp, 45a is a child lock indicator lamp, 5Da is a hot water indicator lamp, and 51a is a hot water indicator lamp.

When the hot water filling switch 41 is turned on, it sends a drive signal to the control device 31, and based on the drive order program read from the memory 34, various drive devices 12.1
7.1B, 21, 22 are driven to automatically fill hot water.

In addition, among the hot water supply conditions, the hot water filling temperature (e.g. 38℃)
The amount of hot water (for example, 2006) is set in advance by the control device 31.
is set by the manufacturer.

However, the hot water filling temperature and hot water filling amount will be determined at a later date.
The settings can also be changed by the manufacturer or user.

In this embodiment, when the hot water filling switch 41 is turned on, hot water filling work is automatically performed, but furthermore,
After the hot water filling work is completed, the sub controller 36 (described later)
The boiling/warming operation automatically shifts to the temperature set by the temperature setting switches 52 and 53, and when this is completed, the boiling/warming indicator lamp 42a, which was lit at the same time as the hot water filling switch 41 was turned on, goes out.

Furthermore, when the boiling and warming work is completed, the bathing OK clamp 2b lights up and the bathing OK buzzer sounds.

The boiling/warming switch 42 automatically fills hot water and
This is used to raise the bath water temperature again to the set bath water temperature after the completion of the boiling and heat retention operation, for example, when the bath temperature drops during the bath.By turning on the switch 42, the above-mentioned The work of boiling and keeping the water warm will be carried out again.

By turning the hot water papier-mâché switch 43,
The above-mentioned hot water filling work and boiling/warming work can be performed at any time.

The reservation time can be set using the reservation time setting switches 43a to 43.
You can set the reservation time by pressing d.
It is displayed on the digital display meter 43e.

When the freeze prevention switch 44 is turned on, the bath in the heat exchanger 11 is maintained at a temperature sufficient for freezing prevention, for example, about 10° C., and the freeze prevention display lamp 44
A will light up.

In addition, the freezing prevention of the bath in the circulation flow path B is performed automatically when the bath becomes lower than the preset freezing prevention temperature.
This is done by turning on the pump 18 to circulate the bath in the circulation channel B.

Further, the child lock switch 45, when turned on, disables the sub-controller 36 from changing the hot water supply conditions, and ensures safety by preventing changes to the hot water supply conditions due to mischief by children or the like. In addition,
When the child lock switch 45 is pressed again, the child lock will be released.

In addition, the sub-controller 36 installed in the bathroom is shown in Figure 3.
The detailed configuration of the sub-controller 36 includes an operation switch 46 and a hot water filling switch 47.
, boiling/warming switch 48 , freezing prevention switch 49 , reheating switch 50 , and addition hot water switch 51
, bathtub temperature setting switches 52 and 53, and -tih amount setting switches 54 and 55.

In this configuration, the operation switch 46, the hot water filling switch 47, the boiling/warming switch 48, and the freeze prevention switch 49 are connected to the main controller 35 described above.
The operation switch 40 and the hot water filling switch 41 in
, the boiling/warming switch 42 , and the freeze prevention switch 44 have similar functions, so a description of these functions will be omitted, and the functions of the other switches will be described below.

That is, the temperature setting switch 52 changes the set bath temperature (for example, 38°C) set by the control device 31 to 1°C or 2°C.
The temperature setting switch 53 can adjust the previously adjusted bath temperature to a lower temperature by 1°C or 2°C. After setting the temperature using the temperature setting switches 52 and 53, turning on the hot water filling switch 47 automatically performs hot water filling, boiling, and warming operations.

After such temperature adjustment and after a certain period of time has elapsed,
By turning on the boiling/warming switch 48, the water can be heated to the set temperature and kept warm.

When turned on, the reheating switch 50 drives the circulation pump 18 to open the circulation passage B regardless of whether or not the bath temperature has reached the temperature set in advance by operating the temperature setting switches 52 and 53. through heat exchanger 11
The high-temperature hot water that has been heat-exchanged is discharged and circulated into the bathtub 16 so that the temperature can be raised to the desired temperature.

In addition, by turning on the hot water switch 51,
The amount of hot water set by the hot water amount setting switches 54 and 55 can be additionally fed into the bathtub 16 through the hot water filling channel C after filling with hot water.

Further, to explain other configurations of the sub-controller 36, 56 is a digital water quantity display meter;
It consists of digits, and the last digit is a printed "0".

When the hot water filling amount is set by operating the hot water amount setting switches 54 and 55, the hot water filling punch 47 is turned on and the set hot water amount is digitally displayed.

Further, 57 is a transition state display section for displaying the transition state of the hot water supply operation, and as the hot water supply operation transitions, the hot water fill indicator lamp 57a, boiling indicator lamp 57b,
The notification display lamp 57c will turn on.

Further, 58.40b is a combustion indicator lamp, which lights up during hot water supply combustion operation.

It should be noted that the sub-controller 36 can be installed somewhere other than near the bathtub.

The operation of supplying hot water to the bathtub 16 by the automatic water heater A having the above configuration will be described below.

Note that hot water supply operation generally consists of hot water supply combustion operation, hot water filling operation, boiling/warming operation, differential heating operation, and addition hot water operation, but the gist of the present invention is that when the measured temperature value of hot water is kept at a constant temperature value. The sequence of the hot water filling operation, which includes the operation of starting hot water filling only after the boiling point is reached, and the hot water supply combustion operation and boiling/warming operation that are performed before and after the hot water filling operation will be explained.

[Hot water heating combustion operation]

Figure 4 shows the sequence of hot water supply combustion operation.

First, turn on the operation switch 40 of the main controller 35 or the operation switch 46 of the sub-controller 36 (
100).

If the hot water temperature value Tml measured by the hot water temperature sensor 30 installed in the heat exchanger ll of the water heater body 10 is lower than the hot water set temperature value ↑s1 set in the control device 31, (lo
t) Turn on the fan motor and igniter of the oil burner 12 (102).

Thereafter, a pre-ignition time and a pre-fan motor time are taken for approximately 7 seconds to eliminate unburned gas within the oil burner 12 (103).

Then, the oil supply pump SP is driven, and the oil burner 12
Oil is supplied to the tank (104) and combustion begins.

When combustion starts, the flame detection sensor, which is made of cadmium sulfide or the like and whose resistance value changes depending on the intensity of light, turns on (105Y), and the combustion indicator lamp 58 turns on (106).
).

The ignition is continued until approximately 5 seconds have elapsed after the combustion indicator lamp 58 has been turned on (107N), and after approximately 5 seconds have elapsed (107Y), the igniter is turned off (108).

If the flame detection sensor does not turn on (105N) and the ignition try time (for example, 5 seconds) has elapsed (109), the misfire alarm buzzer etc. will sound (110), and the fuel pump SP and igniter will stop. (110a).

After the post purge time (approximately 20 seconds) has elapsed (11
0bY), the fan motor is stopped (110c).

Furthermore, the flame detection sensor continues to detect the combustion state as long as the combustion by the oil burner 12 continues (111).

And if the flame detection sensor goes off (IIIN
), restart the ignition operation (11'6 N), and intermittently 3
When repeating on/off times or 4 or more times (l16Y
), it determines that there is an abnormality in the hot water pump or igniter and immediately sounds an alarm buzzer or the like (not shown) (117).

Then, if the flame detection sensor normally maintains the on state and the hot water temperature value Tml measured by the hot water temperature sensor 30 becomes equal to or higher than the hot water temperature setting value Tsl set in the control device 31 (112Y). , stop the fuel pump SP (113), and after the post purge time (approximately 20 seconds) has elapsed to discharge the remainder of the combustion gas (114Y),
Stop the fan motor (115).

Heat exchanger 1 unless operation switch 40.46 is turned off.
If the hot water temperature in the hot water supply unit 1 falls, the hot water supply combustion operation is automatically repeated according to the above sequence.

[Hot water filling work]

Figure 5 shows the sequence of hot water filling operation.

First, the hot water filling switch 41 of the main controller 35
Alternatively, turn on the hot water filling switch 47 of the sub-controller 36 (120).

If the hot water temperature value Tml measured by the hot water temperature sensor 30 installed in the water heater body lOO heat exchanger l is higher than or equal to the bath operation possible temperature value Ts2 set in the control device 31 (121Y), the three-way switching valve 17 switches from the circulation flow path B to the hot water filling flow path C (122), and the solenoid valve 22
is turned on and opened (123).

As a result, the hot water filling pipe 20. Mixing valve 21. Mixed hot water flows into the register 24 through the solenoid valve 22 and the ball tap 23.

In addition, here, the bath operation possible temperature value Ts2 is a value preset in the control device 31, and
It is a value that can be mixed with water from the branch water supply pipe 26 to obtain a predetermined boiling heat retention set temperature value Ts3 (for example, 38°C), for example, the boiling heat retention set temperature value T
It can be set at 40° C., which is a slightly higher temperature value than s3.

However, if the amount of water supplied from the branch water supply pipe 26 is initially set to zero, the bath operation possible temperature value Ts2 can also be made equal to the boiling heat retention setting temperature value Ts3.

On the other hand, if the measured hot water temperature value Tel does not reach the bath operable temperature value Ts2 (121N), the three-way switching valve 17 and the solenoid valve 22 are not operated and the hot water filling operation is not started.

The reason for arranging the sequence in this way is as follows.

That is, at the beginning of operation of the water heater body 10, only hot water at a low temperature can be generated, and this water is supplied to the bathtub 1 through the hot water filling channel C.
6, the set bath temperature cannot be secured even if the set amount of bath water is poured into the bathtub 16, and therefore,
After that, it will take time to boil the water and keep it warm.

Therefore, by making it possible to discharge hot water into the bathtub 16 through the hot water filling flow path C in advance after the hot water supply temperature determined by the heat exchanger 1 reaches the bath operation possible temperature value Ts2, the hot water supply temperature value Tml is made possible. This made it possible to fill, boil, and keep warm water in a short amount of time.

Next, by turning on the three-way switching valve 17 and the solenoid valve 22, (1
22) (123), As the mixed hot water starts to flow into the hot water supply pipe 20 at the distern 24 and beyond, the water amount sensor 25 counts while integrating the amount of hot water (124)
.

Then, when the water level in the cistern 24 rises to a certain level, the lower limit float switch 27 is turned on (125Y).
, and after a predetermined period of time, for example 3 seconds, has elapsed according to the on-delay timer (126Y), the circulation pump 18 is driven (127).

The lower limit float switch 27 was provided because
This is because if the circulation pump 18 is operated when the inside of the distern 24 is empty or at an extremely low water level, the suction force of the circulation pump 18 is strong, and thus a suction sound (unpleasant sound) is generated.

Further, the reason why the circulation pump 18 is not activated immediately after the lower limit float switch 27 is turned on but after the on-delay time is to prevent the lower limit float switch 27 from turning on and off frequently, that is, so-called chattering.

Then, along with the driving of the circulation pump 18, the hot water is passed through the hot water filling channel C to a boiling heat retention set temperature value Ts3 (for example, 3
Mixed hot water (8°C) will be dispensed into the bathtub li3.

Then, the count value Q of the cumulative amount of hot water by the water amount sensor 25
When c becomes equal to the preset hot water supply amount Qs set in advance by the IIJI device 31 (12BY), the solenoid valve 22 is turned off and closed (129).

Next, the water level in the register 24 is lowered and the lower limit float switch 27 is turned off (130Y), and after a predetermined period of time, for example, 30 seconds has elapsed by the off-delay timer (131Y), the three-way switching valve 17 is turned off and the flow path is closed. of,
Switch from hot water filling channel C to circulation channel B (232)
.

Further, after the three-way switching valve 17 is turned off (132), the process automatically shifts to boiling and warming operations (see Fig. 6).

Furthermore, the hot water filling sequence in this embodiment is also characterized by the following configuration.

That is, while turning on the hot water filling switch 47 (12
0), the digital hot water amount display meter 56 on the sub-controller 36 displays the preset hot water filling amount (for example, 20 (
1 is displayed digitally (Sl).

Thereafter, as the water flow sensor 25 starts counting the cumulative amount of hot water (124), for example, the current amount of hot water is digitally displayed for each IOJ in a countdown manner (i.e., 20M - 1907!, 1801...OR).
(Sl).

Therefore, the user can visually and reliably recognize the hot water filling situation in real time.

In addition, if the set amount of hot water is dispensed into the bathtub 16 (128), the digital hot water amount display needle 56 will indicate “
0" flashes at intervals of, for example, 0.5 seconds.

Note that this blinking continues until the initial boiling time is completed (S2).

Further, in this embodiment, when the measured hot water temperature value Tel is higher than the bath operation possible temperature value Ts2 (121Y), the three-way switching valve 17 and the solenoid valve 22 are turned on (1
22) (123), along with turning on this solenoid valve 22,
The solenoid valve ON integration timer operates and the ON time of the solenoid valve 22 is integrated (135) for a predetermined period of time (for example, 90 minutes).
After the lapse of time, the solenoid valve 22 is turned off and the circulation pump 18 is turned on (136). At the same time, the ′warning lamp (
(not shown) is turned on (136^).

This was done to prevent the solenoid valve 22 and circulation pump 18 from remaining on indefinitely due to a failure of the water flow sensor 25, failure of the hot water filling pipe 20, or forgetting to close the drain plug of the bathtub 16. This is to quickly stop the hot water filling operation.

By doing so, hot water can be saved by preventing hot water from flowing out.

Incidentally, after the solenoid valve 22 is turned off and the circulation pump 18 is turned on (136), the lower limit float switch 27 is turned off.
37Y), the same off state has elapsed for the time set by the off-delay timer, for example 30 seconds (138Y)
Afterwards, the three-way switching valve 17 is turned off, and the circulation pump 1 is turned off.
8 is also turned off (139).

The reason why the off-delay time is provided in this way is to eliminate all the mixed hot water remaining in the hot water filling pipe 20 between the distern 24 and the distern 24 and the three-way switching valve 17. and circulation pump 18
It is possible to reliably prevent the occurrence of freezing and unsanitary conditions due to the ability of

Furthermore, in this embodiment, the lower limit float switch 27
After the circulation pump 18 is turned on (136) and the hot water supply is turned on (135), the hot water filling operation is performed according to the following routine until the counted amount of hot water reaches the set amount of hot water (137).

In normal operation, the discharge amount from the pole tap 23 is set to be larger than the suction amount of the circulation pump 1B, and the flow rate inside the cistern 24 is adjusted by opening and closing the valve inside the pole tap 23 as the pole tap 23 moves up and down. It will be done by.

However, for example, if the suction capacity of the circulation pump 18 exceeds the discharge capacity from the pole tap 23, and as a result, the lower limit float switch 27 is turned off (140Y), the circulation pump 18 is turned off (141), the lower limit float switch Circulation pump 18 will not turn on until 27 is turned on again. Thereby, generation of unpleasant suction noise can be prevented.

On the other hand, in normal operation, even if the lower limit float switch 27 does not turn off (14ON), if the pole taps 2:3 cannot adjust the flow rate due to a failure of the pole tap 23, etc., and the water level rises abnormally, the upper limit float switch 27 The float switch 28 turns on (142Y), and the time set by the on-delay timer (for example, 0.5 seconds) has elapsed (1
43Y), the solenoid valve 22 can be stopped after (14Y).
4).

Therefore, accidents such as overflow from the distern 24 can be reliably prevented.

When the upper limit float switch 28 is turned on, the solenoid valve 22 is immediately stopped, and when the upper limit float switch 28 is turned off again due to a drop in the water level, the off-delay timer is activated for, for example, 2 seconds, and the solenoid valve 22 is turned off. valve 22
You can also turn it on.

This effectively prevents chattering.

Also, if the upper limit float switch 28 does not turn on (1
42N) and while the on-delay time has not expired even if the upper limit float switch 28 is turned on (143N),
The solenoid valve 22 remains in the on state, and normal work will be performed (145).

Furthermore, in this embodiment, as shown in FIG. 5, when it is desired to end the operation by just filling the hot water, after switching the three-way switching valve 17 (132), the off-delay timer indicates that a predetermined period of time, for example, 60 seconds has elapsed. If not later (133
), the circulation pump 18 is prevented from stopping (1
34).

The off-day delay time was provided in this way, rather than in the above-mentioned operation mode in which the hot water filling operation automatically shifts to the boiling/warming operation. This is to prevent the mixed hot water from flowing backwards from the circulation flow path B to the hot water filling pipe 20 when the circulation pump 17 is turned off at the same time, thereby preventing damage to the hot water filling pipe 20 due to freezing and the occurrence of non-aerial conditions. .

The same sequence is also used when turning off the hot water filling operation.

[Boiling/warming operation]

The boiling/warming operation is performed according to the sequence shown in FIG.

As shown in FIG. 6, in normal operation, after the hot water filling operation shown in FIG. Connection step in mid-interruption in the figure ■).

That is, the bath water is circulated in the circulation flow path B, and the bath water temperature sensor 2
The bath water measurement temperature value Tm2 detected by 9 is equal to or higher than (150Y) the boiling heat retention set temperature value Ts3 set by the bathtub temperature adjustment switch 52-53 of the sub-controller 36, and the boiling detection timer After the time set (for example, 5 seconds) has elapsed (151Y), the boiling is completed and the circulation pump 1
8 stops, and the hot water filling lamp 47 is turned off (152).

In addition, if the bath measured temperature value Tm2 is lower than the boiling heat retention setting temperature value Ts3, the bath temperature value Tm2 is heated until the bath temperature value Tm2 becomes equal to or higher than the boiling heat retention temperature setting value Ts3.
Continue temperature measurement continuously or periodically (15ON
).

It is determined whether it is the first time to boil or not, and if it is the first time to boil (153Y), the notification buzzer turns on (15
3A).

With this, it is possible to prevent the buzzer from sounding every time the boiling/warming operation is performed, which may cause discomfort to the user.

Then, normally, the boiling operation is automatically shifted to the warming operation (154Y).

Along with this transition, the bath OK clamp 2b of the main controller 35 lights up (155).

When the bath OK clamp 2b lights up, the heat retention timer is activated (155a), and the bath water temperature is measured by the bath water temperature sensor 29 at regular intervals (for example, 15 minutes).
), the bath measured temperature value Tm2 is the boiling heat retention setting temperature value T
If it is lower than s3, turn off the bathing OK clamp 2b (157) and drive the circulation pump 18 for a predetermined time (for example, 5 seconds) (158), and then the boiling/warming switch 42 or 48 is not pressed again. as long as(
159 N), or the first boil notification buzzer (15
Unless the heat retention operation continuation time (e.g. 4 hours) counted by the heat retention operation continuation timer has elapsed (16ON), the process returns to step (150) and repeats the boiling and heat retention operation (150)"~( 157).

On the other hand, based on the operation of the heat retention timer (in the bath temperature measurement, if the bath temperature measurement value Tm2 is higher than the boiling heat retention set temperature value Ts3 (156), the bathing OK clamp 2b is held in the ON state. , When the boiling/warming switch 42 or 48 is artificially turned off (154N) (159Y), or when the warming operation continuation time has elapsed (16ON), the boiling/warming lamp 48a is turned off (161) ).

In addition, the reason why the keep-warm operation continuation time is measured by the keep-warm timer and the keep-warm operation is canceled when the time has elapsed is because the user forgets to turn off the boil-up/keep-warm switch 42 or 48. It is designed to automatically cancel even if the

Furthermore, in the above routine, the case where the heat retention operation is not performed (154N) refers to the case where it is artificially turned off, or the case where the additional hot water operation is performed by turning on the additional hot water switch 51. In this case, the set additional hot water amount is After the hot water is dispensed, it ends without being kept warm.

In addition, in normal hot water supply operation, as mentioned above, after the hot water filling operation is completed, the boiling/warming operation is automatically performed (at the final end of the routine in Figure 5 and at the midway interrupt in Figure 6). In the connection step (■), the boiling and warming operations can be performed separately and independently from the hot water filling operation.

In this case, instead of the hot water filling operation, steps (162) to (165) of the sequence shown in FIG. 6 will be performed.

That is, first, the boiling/warming switch 42 of the main controller 35 or the boiling/warming switch 42 of the sub controller 36 is activated.
Turn on the heat retention switch 48 (162).

If the hot water temperature value Tml measured by the hot water temperature sensor 30 installed in the heat exchanger ll of the water heater body IO is higher than the boiling operation possible temperature value Ta4 set in the control device 31 (163Y), the circulation pump 18 Onshiku 164),
High-temperature water flows from the heat exchanger 11 to the bathtub 16 through the circulation flow path B.
The water flows into the bath while circulating, gradually raising the temperature of the bath.

However, if the measured hot water temperature value Tl1l does not reach the boiling operation possible temperature value Ts4 (163N), the circulation pump 18 is not turned on.

Note that here, the boiling operation possible temperature value Ts4 is a value preset in the control device 31, and is a temperature considerably higher than the predetermined boiling heat retention setting temperature value Ts3 (for example, 38°C), for example, 50°C. Can be set.

The reason for arranging the sequence in this way is as follows.

That is, at the beginning of the boiling operation of the water heater main body 10, only hot water at a low temperature can be generated, and this water is passed through the circulation path B to the bathtub 1.
6, even if the set amount of bath water is dispensed into the bathtub 16, it will take too long to secure the set bath temperature. By allowing hot water to be discharged into the bathtub 16 through the circulation flow path B after the measured hot water supply temperature value Tml is reached, the set bath temperature can be obtained in a minimum time.

Then, the circulation pump 18 is turned on (164), and after the pump initial time set by the pump initial timer has elapsed (165Y), step (164) is started.
50) to perform appropriate temperature control.

That is, until the pump initial time has elapsed, the appropriate temperature control (150) is not performed, and the output detected by the bath water temperature sensor 29 is ignored by the control device 31.

This was done for the following reasons. Return side piping 1
While bathtub 9 is heated by the setting sun, bathtub 16
Even if the circulation pump 18 is turned on, such as when the
Although the actual temperature of the bath water in the bathtub 16 is low, the bath water temperature sensor 29 detects the hot bath water temperature in the return pipe 19 and sends an erroneous detection output to the control device 31. Therefore, in order to prevent false detection due to such piping conditions, etc., the detection outputs of the bath water temperature sensor 29 etc. are ignored until the bath temperature becomes uniform in the circulation flow path B, and then the appropriate temperature control ( 150) to enable accurate control.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram illustrating the configuration of an automatic water heater according to the present invention;
Figure 2 is an explanatory diagram of the configuration of the main controller, Figure 3 is an explanatory diagram of the configuration of the sub-controller, Figure 4 is a flowchart for hot water supply combustion operation, Figure 5 is a flowchart for hot water filling operation, and Figure 6 is a flowchart for boiling and keeping warm. It is a flowchart of operation. In the figure, A: Automatic water heater B: Circulation channel C: Hot water filling channel 11: Heat exchanger 15: Outgoing piping 16: Bathtub 17; Three-way switching valve 18: Circulation pump 19: Returning piping 20: Hot water filling Piping 22: Solenoid valve patent applicant Totokiki Co., Ltd. Representative Ken Matsuo

Claims (1)

[Claims] 1. The heat exchanger (11) and the bathtub (16) are connected to each other by an outgoing pipe (15) and a returning pipe (19) with a circulation pump (18) interposed in the middle. to form a circulation flow path (B),
Hot water filling piping (20) that supplies mixed hot water for filling hot water to the outgoing piping (15) on the upstream side of the circulation pump (18)
In a one-can, two-channel automatic water heater in which the hot water is connected through a three-way switching valve (17) to form a hot water filling channel (C), an electromagnetic A solenoid valve (22) linked to a valve-on integration timer is provided, and when the solenoid valve (22) and the three-way switching valve (17) are turned on, the flow path (C) for filling the bathtub (16) with hot water opens, and a certain amount of hot water is filled. When hot water is supplied, the hot water filling channel (C) is configured to be automatically closed, and after a certain amount of hot water filling time has elapsed by accumulating the on time of the solenoid valve (22) using a solenoid valve on integration timer. An automatic water heater having a hot water filling stop function in the event of an abnormality, which is configured to close a hot water filling channel (C) by turning off a solenoid valve (22).