JPH01222142A - Automatic hot-water supplier - Google Patents

Abstract

PURPOSE:To permit hot-water filling, hot-water heating and temperature keeping operations with the minimum time, by a method wherein the discharging of hot-water for filling a bathtub through a hot-water filling flow passage is stopped until the value of measuring temperature of supplying hot-water in a heat exchanger becomes higher than the value of the temperature capable of effecting bath operation. CONSTITUTION:When the value Tm1 of a measuring hot-water temperature, detected by a supplying hot-water temperature sensor 30, provided in a heat exchanger 11 for the main body 10 of a hot-water supplier, has not arrived at the value Ts2 of a bath operation permitting temperature, set in a control unit 31, a three-way change over valve 17 and a solenoid valve 22 are not operated whereby hot-water filling operation is not started. The supply of hot-water into a bathtub 16 through a hot-water filling flow passage C is permitted after the value Tm1 of measuring hot-water tempera ture has arrived at the value Ts2 of bath operation permitting temperature whereby hot-water filling, hot-water heating and temperature keeping operations are permitted with the minimum period of time. The inflow of mixed hot-water and water into a cistern 24 and a hot-water filling pipeline 20, connected after the cistern 24, is started by the three-way changeover valve 17 and the solenoid valve 22 while a water amount sensor 25 counts while accumulating the amount of hot-water.

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 an appropriate amount of hot water into the bathtub through the hot water filling pipe, three-way switching valve, and 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 heater body into the bathtub through the outgoing piping.
This is done by circulating the bath in the bathtub to the heat exchanger through the return piping to form a circulating flow 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.

That is, during hot water filling work, the high temperature hot water fed from the heat exchanger of the water heater to the hot water filling piping is first mixed with low temperature water by the mixing pulp to produce mixed hot water at an appropriate temperature for the bathtub.

However, when the water heater main body is initially started, the high-temperature hot water that is fed from the heat exchanger to the hot water filling piping is not actually at a high temperature.

Therefore, even if such high-temperature water is mixed with low-temperature water in the mixing pulp, a mixture of hot water and cold water at an appropriate temperature cannot be generated, and mixed hot water at a temperature far lower than the optimum temperature will flow into the bathtub. It takes time to boil water and keep it warm.

An object of the present invention is to provide an automatic water heater that can solve the above problems.

(D) Means for Solving the Problems The present invention connects the heat exchanger and the bathtub through an outgoing piping and a returning piping with a circulation pump interposed midway to form a circulation flow path. , a 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 1
In automatic water heaters with two cans and channels, the supply of hot water to the bathtub through the hot water channel is stopped until the hot water temperature measured by the hot water temperature sensor in the heat exchanger becomes higher than the bath operating temperature value. The present invention relates to an automatic water heater characterized by:

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

That is, in the present invention, at the beginning of hot water filling work, the temperature of the hot water supplied from the heat exchanger to the mixing valve provided in the hot water filling pipe is low, and the temperature of the mixed hot water generated by the mixing pulp valve is lower than the temperature that allows bath operation. In this case, the hot water supply to the bathtub can be stopped, and the hot water supply to the mixing valve is started only when the temperature reaches a temperature sufficient to produce a mixture of hot water and water at the appropriate temperature. - Boiling water and keeping it warm are now possible, allowing users to quickly take a bath at the appropriate temperature.

(F) Examples The present invention will be specifically explained 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. In the figure, 10 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 disconnection 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 path B can be formed from the bathtub 16 to the return pipe 19 to the heat exchanger 11, and by driving the circulation pump 18, the bath in the bathtub 16 is circulated within the circulation path B. The bath can be continuously heated by the heat exchanger 11 to boil the bath and keep it warm.

Further, in FIG. 1, 20 is a hot water filling pipe whose starting end is branched from the hot water supply pipe 14, and the end of the hot water filling pipe 20 is connected to a mixing valve 2L solenoid valve 22, a pole tap 23, a cistern 24 and a water flow sensor 25. , are 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 valve 21→electromagnetic valve 22→ball tap 23→displacement 24
→Water flow sensor 25→Three-way switching valve 17→Outgoing pipe 15→
A hot water filling channel C consisting of the circulation pump 18 and the 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 in the heat exchanger 11 is large, a large amount of hot water flowing into the heat exchanger 11 can be supplied in a short period of time.On the other hand, the heat exchange capacity of the inner pipe 11a of the heat exchanger n11 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 pipe 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 branched by the mixing valve 21. Water supply piping 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 is originally used to adjust the water level using the pole tap 23, but is used to prevent overflow from the cistern 24 in the event that the pole tap 23 fails. 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 16. On the other hand, 30 is a hot water temperature sensor disposed within the heat exchanger 11 of the water heater main body 1O, which measures the temperature of high temperature hot water generated within 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 temperature sensor 29 and a hot water 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. A driving sequence program for driving the mixing pulp 21° oil supply pump SP and the solenoid valve 22 is stored, and as described later, when there is an interrupt operation in the middle of the main routine, the program immediately before the Operating conditions or hot water tap conditions can be stored.

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 indicate simple conditions for dispensing hot water to the bathtub 16.

Note that the controller can also be installed at other locations.

By operating these controllers 35 and 36, predetermined drive signals or control signals are sent to the control device 31, and based on the drive signals, the oil burner 12 (including the oil supply pump SP) and the three-way switching valve are controlled. 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, the circulation pump 18. Mixing valve 21 and solenoid valve 2
Various drive devices such as 2 and water flow sensors 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 indicator lamps that light up when the operation switch 40 is turned on, 41a and 47a are hot water filling indicator lamps, 42a and 48a are boiling and keeping warm indicator lamps, 43f are hot water filling reservation indicator lamps, 44a and 49a
is a freeze prevention indicator lamp, 45a is a child lock indicator lamp, 50a is a refill 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
? , 18.21.22, to automatically fill the hot water.

In addition, among the hot water supply conditions, the hot water filling temperature (e.g. 38°C
) and the amount of hot water (for example, 20Of) are set in advance by the control device 3.
1 is set on the manufacturer side.

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 temperature setting switches 52 and 53 automatically move to the boiling/warming operation up to the predetermined temperature, and when that is finished, the boiling/warming operation that lights up at the same time as the hot water filling switch 41 is turned on.
The heat retention indicator lamp 42a is turned off.

Further, when the boiling and warming work is completed, the bathing lamp 42b lights up at 0, 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 on 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 reserved time can be set by pressing the reserved time setting switches 43a to 43d, and the set reserved time is displayed on the digital display 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 prevention of freezing of the bath water in the circulation flow path B is performed by automatically turning on the circulation pump 18 to circulate the bath water in the circulation flow path B when the bath water becomes lower than a preset freezing prevention temperature. .

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 specific configuration of the same 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
, a temperature setting switch 52.53, and a hot water amount setting switch 54.55.

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 can adjust the set bath temperature (for example, 38°C) set by the control device 31 to a higher temperature side by 1°C or 2°C.
The temperature setting switch 53 can adjust the set bath temperature once adjusted to a lower temperature by 1°C or 2°C. And temperature setting switch 52.53
After making the settings, by turning on the hot water filling switch 47, hot water filling, boiling, and warming operations can be performed automatically.

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 vII circulation path B, regardless of whether or not the bath temperature has reached the temperature set in advance by operating the temperature setting switch 52 or 53. The high temperature hot water that has been heat exchanged with the heat exchanger 11 is discharged and circulated into the bathtub 16 through the
It 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".

Then, when the amount of hot water is set by operating the hot water amount setting switches 54 and 55, the hot water filling switch 4
When 7 is turned on, the set amount of hot water will be displayed digitally.

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.

Furthermore, reference numerals 58 and 40b are combustion indicator lamps, which are lit 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, reheating operation, and hot water addition operation, but the gist of the present invention is that when the measured temperature value of hot water is kept at a constant temperature. 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 Tm measured by the hot water temperature sensor 30 installed in the heat exchanger 11 of the water heater body 10 is lower than the hot water set temperature value Ts+ set in the control device 31, (10
1) Turn on the fan motor and igniter of the oil burner 12 (102).

Thereafter, pre-ignition time and brifan motor time are taken for approximately 7 seconds to eliminate unburned gas in 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 contains cadmium sulfide, etc. and whose resistance value changes depending on the strength of light, turns on (105Y), and the combustion indicator lamp 58 turns on (106).
).

Note that 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 (10B).

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

However, if the flame detection sensor goes off (IIIN
), restart the ignition operation (116N), if the ignition turns on and off intermittently 3 or 4 times or more (116Y).
), it is determined that there is an abnormality in the fuel pump or igniter, and the alarm buzzer, etc. (not shown) is not sounded immediately (117)
.

Then, if the flame detection sensor continues to be in the ON state normally and the hot water temperature value Tm+ measured by the hot water temperature sensor 30 becomes equal to or higher than the hot water supply set temperature value Ts+ set in the control device 31 (112Y). , oil pump sp
113), and after the boss purge time (approximately 20 seconds) has elapsed to exhaust the remaining combustion gas (114Y).
, the fan motor is stopped (115).

Unless the operation switch is turned off, if the hot water temperature in the heat exchanger drops, the hot water combustion operation will be repeated automatically 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 Tm+ measured by the hot water temperature sensor 30 installed in the heat exchanger 11 of the water heater body 10 is higher than or equal to the bath operation possible temperature value TsO set in the control device 31 (121Y), the three-way The switching valve 17 switches from the circulation flow path B to the hot water filling flow path C (122), and the solenoid valve 22
turns on and opens < (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 pole tap 23.

In addition, here, the bath operation possible temperature value Tsl is a value preset in the control device 31, and
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 Ts
It can be set to 40° C., a temperature value slightly higher than 3.

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 Tsl can also be made equal to the boiling heat retention setting temperature (ITS3).

On the other hand, if the measured hot water temperature value Tm+ does not reach the bath operation possible temperature value Tsz (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 the operation of the water heater main 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 after the hot water supply temperature in the heat exchanger 11 reaches the bath operation possible temperature value Tsl before the hot water supply measurement temperature value Tmt, hot water can be heated in the minimum time. This made it possible to perform tasks such as tensioning, boiling water, and keeping warm.

Next, by turning on the three-way switching valve 17 and the solenoid valve 22, (1
2Sj) (123), At the same time as the mixed hot water starts to flow into the hot water filling 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, as the circulation pump is driven for one day, mixed hot water at a constant temperature value Ts2 (for example, 38° C.) is discharged into the bathtub 16 through the hot water filling channel C.

Then, the count value Q of the cumulative amount of hot water by the water amount sensor 25
Setting hot water filling FJ where c is preset by the control device 31
If it becomes equal to Qs (128Y), the solenoid valve 22
Turn off and close (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 (132)
.

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), digital water flow indicator 5 on sub-controller 36
6 is the preset hot water filling M (for example, 20ON
) is displayed digitally (Sl).

Thereafter, as the water flow sensor 25 starts counting the cumulative amount of hot water (124), the current amount of hot water is digitally displayed in a countdown manner for each IQffi, for example.
(i.e. 201! -190j!・ 180j!...
・0fi) (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), "
0" flashes at intervals of, for example, 0.5 seconds.

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

In addition, in this embodiment, if the measured hot water temperature value T■1 is higher than the bath operation possible temperature value Tst (121Y), the three-way switching valve 17 and the solenoid valve 22 are turned on (121Y).
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 elapsed time, the solenoid valve 22 is turned off, the circulation pump 18 is turned on (136), and at the same time, the alarm lamp (
(not shown) is turned on (136A).

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 stop the hot water filling operation.

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)
After that, the three-way switching valve 17 is turned off, and the circulation pump I is turned off.
B 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) along with turning on (135), 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 18, 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 1B 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), and the lower limit float switch 27 is turned off (140Y). The circulation pump 18 is not turned on until the switch 27 is turned on again, thereby preventing unpleasant suction noise from occurring.

On the other hand, in normal operation, even if the lower limit float switch 27 does not turn off (14 ON), if the pole tap 23 is unable to adjust the flow rate due to a malfunction of the pole tap 23, and the water level rises abnormally, the upper limit float switch 27 28 turns on (142Y), and the time set by the on-delay timer (for example, 0.5 seconds) has elapsed (14
After 3Y), the solenoid valve 22 can be stopped (144
).

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

Also, 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 on. It is also possible to do this. 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 is provided in this way, rather than in the above-mentioned operation mode where hot water filling operation automatically shifts to boiling/warming operation, and when you want to end the hot water filling operation only. This is to avoid that when the pump 17 is turned off at the same time, the mixed hot water flows back from the circulation flow path B to the hot water filling pipe 20, thereby preventing damage to the hot water filling pipe 20 due to freezing and the occurrence of unhygienic conditions.

The same sequence is also used when turning off the hot water supply in the middle of 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-interrupt (■).

That is, the bath is circulated through the circulation path B, and the bath water temperature sensor 2
9 is equal to or higher than the boiling heat retention setting temperature value Ts3 set by the bathtub temperature adjustment switch 52.53 of the sub-controller 36 (150Y), and the temperature value Tsl detected by the bathtub temperature adjustment switch 52. After the specified time (for example, 5 seconds) has passed (151Y), the boiling is completed and the circulation pump 1 is turned off.
8 stops, and the hot water filling lamp 47 is turned off (152).

In addition, when the bath measured temperature value Ts4 is lower than the boiling heat retention setting temperature value Ts3, the bath temperature value Tan1 is heated until it becomes equal to or higher than the boiling heat retention temperature setting value ↑S.
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
38).

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 lamp 42b is turned on at bath time 0, the heat retention timer is activated (155a), and the bath water temperature sensor 29 is made to measure the bath water temperature at fixed time intervals (for example, 15 minutes) (156).
The bath measured temperature value Tl112 is the boiling heat retention setting temperature value T
If s is lower than s, turn off the lamp 42b at bath time 0 (157) and drive the circulation pump 18 for a predetermined period of time (for example, 5 seconds) (158) - then turn on the boiling/warming switch 42 again or for 4 days. Unless pressed (1
59N), or the first boil notification buzzer (153N), or the first boil notification buzzer (153N)
Unless the thermal insulation operation continuation time (e.g. 4 hours) counted by the thermal insulation operation continuation timer has elapsed (16ON), the process returns to step (150) and repeats the boiling/warming operation (150) to (157). ).

On the other hand, in the bath temperature measurement based on the operation of the heat retention timer, if the bath temperature measurement value Tl111 is higher than the boiling heat retention set temperature value Ts5 (156Y), the bathing OK clamp 2b is held in the ON state.

In addition, 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 48 of the sub-controller 36 is turned on (162).

The hot water temperature value T+@+ measured by the hot water temperature sensor 30 installed in the heat exchanger 11 of the water heater main body 10 is determined by the control device 31.
If the boiling operation temperature value Ts set in
), high-temperature hot water flows from the heat exchanger 11 into the bathtub 16 while circulating through the circulation path B, gradually increasing the bath temperature.

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

Note that here, the boiling operation possible temperature value Tsa 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' It can be set to C.

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 IO, only hot water at a low temperature can be generated, and this water is sent to the bathtub 1 through the circulation flow path B.
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 has been 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 elapses, the appropriate temperature control (150) is not performed, and the output detected by the bath 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 bath temperature 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 erroneous 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 is performed based on the detection outputs. 1l (150), making accurate control possible.

[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 pipe 16: Bathtub 18: Circulation pump 19: Return pipe 20: Hot water filling pipe 30: Hot water temperature Sensor patent applicant: Totokiki Co., Ltd. Representative: Kenichi 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 type automatic water heater in which the water is branched and communicated via a three-way switching valve (17) to form a hot water filling channel (C), the heat exchanger ( 1
1) The bathtub (16) is filled with hot water through the flow path (C) until the measured temperature value of hot water supply in the bathtub becomes higher than the bath operation temperature value.
An automatic water heater characterized by stopping the supply of hot water to the water heater.