JP3331164B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for supplying hot water to a bathtub or a kitchen.

[0002]

2. Description of the Related Art For example, in an instantaneous gas water heater, a heat exchanger which is heated by a gas burner and raises the temperature of water supplied from a water supply pipe, and a hot water supply from the heat exchanger via a water supply pipe. A hot water supply temperature sensor for detecting the temperature of hot water to be supplied;
And a running water sensor for detecting the presence or absence of running water passing through the heat exchanger.

[0003] Then, when the user opens a curan or the like connected to the end of the hot water supply pipe, water supply to the heat exchanger is started, and when water flowing through the heat exchanger is detected by the water flow sensor, the water flow is detected. In response to the detection of the flowing water, the gas burner is activated, and heating of the water in the heat exchanger is started.

However, in this case, the hot water that has passed through the heat exchanger and is heated from the heat exchanger is supplied from the heat exchanger in addition to the water remaining in the hot water supply pipe from the heat exchanger to the heat exchanger. This is after the water staying in the heat exchanger is supplied from the karan. For this reason, there is a time delay between when the user opens the curan and when the hot water is actually supplied to the curan, which is inconvenient to use.

Therefore, in order to reduce the time delay from the opening of the curan to the start of hot water supply, a heat exchange temperature sensor for detecting the temperature of hot water near the outlet of the heat exchanger is provided. A gas hot water supply device is also known that performs a heat retention control for intermittently operating a gas burner so that the temperature detected by the heat exchange temperature sensor is maintained in a predetermined range even when the flowing water sensor does not detect flowing water. (JP-A-9-243169 and the like). In addition, not in the heat exchanger,
The reason why the heat exchange temperature sensor is provided near the outlet of the heat exchanger is to avoid the influence of the rising hot air from the heating means arranged below the heat exchanger.

As described above, by performing the heat retention control for keeping the hot water in the heat exchanger in a predetermined temperature range in advance, the hot water is supplied from when the user opens the curan to when the hot water is supplied to the curan. Since the amount of water can be limited to the water staying in the hot water supply pipe from the heat exchanger to the curan, the delay time before hot water is supplied to the curan than when the heat retention control is not performed is reduced. Can be.

However, the present inventors have found that the following inconveniences occur when the heat retention control is performed based on the temperature detected by the heat exchange temperature sensor.
That is, generally, heating of the gas burner to the heat exchanger is performed from the lower part of the heat exchanger. Therefore, the hot water in the heat exchanger does not move as in the case of hot water supply, and heating is performed in a state in which the hot water in the heat exchanger stays.In the heat retention control, when the heat exchanger is heated by the gas burner, The temperature of the hot water in the upper part of the heat exchanger farther from the gas burner is lower than the lower part of the heat exchanger close thereto, and the heat exchange temperature sensor provided near the outlet at the upper part of the heat exchanger It has been found that the temperature of the hot water below the heat exchanger may be higher than the temperature detected by the heat exchanger.

[0008] In this case, when the temperature detected by the heat exchange temperature sensor becomes lower than a predetermined heat retention start temperature, the heat retention control for heating the hot water in the heat exchanger by operating the gas burner is executed. However, in the lower part of the heat exchanger where the temperature of the hot water is higher than the temperature detected by the heat exchange temperature sensor, heating is performed more than necessary, and the hot water in that part may be boiled. Such boiling of the heat exchanger causes inconvenience that the life of the heat exchanger is deteriorated and that a sound generated at the time of boiling causes discomfort to the user.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned inconveniences that occur during the heat retention control of hot water in a heat exchanger, and does not cause deterioration of the heat exchanger or discomfort to the user. The purpose is to provide.

[0010]

To achieve the above object, the present invention provides a heat exchanger in which water is supplied by a water supply pipe .
And disposed below the heat exchanger to remove water in the heat exchanger.
A heating means for heating, a hot water supply pipe from which hot water heated by the heat exchanger is discharged, a hot water supply temperature sensor for detecting a temperature of hot water supplied from the hot water supply pipe, and a hot water supply sensor formed at an upper portion of the heat exchanger.
A heat exchanger temperature sensor for detecting the temperature of the hot water in the vicinity of outlets,
A flowing water sensor for detecting the presence or absence of flowing water passing through the heat exchanger; and the heating means so that when the flowing water is detected by the flowing water sensor, the detected temperature of the hot water supply temperature sensor matches a predetermined hot water supply target temperature. Hot water supply control for adjusting the heating amount of the heating means, and when the flowing water sensor is not detecting the flowing water, and when the temperature detected by the heat exchange temperature sensor becomes lower than a predetermined temperature keeping start temperature, the heating means is kept at a predetermined temperature. And a hot water supply control unit that performs a heat retention control that operates during a heating time determined according to the target temperature.
The hot water supply control means, when stopping the heating means in the heat retention control, thereafter stores the heat in the heat exchanger.
The temperature of the retained hot water is made uniform by diffusion and substitution of the hot water,
The temperature of the hot water supply temperature sensor is different from the temperature of the hot water in the heat exchanger.
Until a predetermined time supposed to coincide , the heating means is not operated even if the temperature detected by the heat exchange temperature sensor is lower than the heat retention start temperature.

According to the present invention, since the heating means is disposed below the heat exchanger, the temperature of the hot water in the heat exchanger during operation of the heating means is not uniform. The upper part is lower than the upper part. In this case, the temperature detected by the heat exchange temperature sensor provided near the upper outlet of the heat exchanger is lower than the temperature of the hot water in the lower part of the heat exchanger. However, after the stop of the heating means, the temperature of the hot water in the heat exchanger gradually becomes uniform by diffusion and convection of the hot water, and finally the hot water temperature in the heat exchanger becomes uniform, and the heat exchange temperature The temperature detected by the sensor matches the temperature of the hot water in the heat exchanger.

For this reason, the hot water supply control means in the present invention, during execution of the heat retention control, after stopping the heating means,
The temperature of the hot water staying in the heat exchanger is
And the temperature of the hot water supply temperature sensor is
Until a predetermined time that is assumed to coincide with the temperature of the hot water in the exchanger elapses, even if the temperature detected by the heat exchange temperature sensor is lower than the heat retention start temperature, the heating unit is not operated. I have.

[0013] Thus, there is a portion in the heat exchanger where the temperature of the hot water is higher than the temperature detected by the heat exchange temperature sensor, and the temperature detected by the heat exchange temperature sensor is lower than the heat retention start temperature. When this happens, it is possible to prevent the heating means from being operated and boiling the hot water in the high temperature portion, thereby preventing the heat exchanger from deteriorating and causing discomfort to the user.

[0014]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of the hot water supply device of the present invention, FIG. 2 is an external view of a remote control provided in the hot water supply device shown in FIG. 1, and FIGS. 3 to 5 are operation flowcharts of the hot water supply device shown in FIG. .

Referring to FIG. 1, hot water supply device 1 includes a hot water supply section 2.
And the reheating unit 3, and the controller 4 controls the hot water supply unit 2 and the reheating unit 3.

The hot water supply unit 2 includes a hot water supply heat exchanger 6 (corresponding to a heat exchanger according to the present invention) which is heated by a hot water supply burner 5 (corresponding to a heating means according to the present invention) which is operated by a control signal from the controller 4. A water supply pipe 7 connected to a non-use water pipe to supply water to the hot water supply heat exchanger 6, a water quantity servo 8 for adjusting the opening degree of the water supply pipe 7 based on a control signal from the controller 4, and a controller for detecting the temperature of supplied water. 4, a running water sensor 1 that detects the presence or absence of running water passing through the hot water supply heat exchanger 6 and outputs the running water to the controller 4.
0, a hot water supply pipe 11 from which hot water heated by the hot water supply heat exchanger 6 is supplied, a bypass pipe 12 for mixing a part of water supplied to the water supply pipe 7 into the hot water supply pipe 11, and a bypass by a control signal from the controller 4 A bypass servo 13 for adjusting the opening of the pipe 12; a controller 4 for detecting the temperature of hot water in a hot water supply pipe 25 downstream of a junction of the hot water supply pipe 11 and the bypass pipe 12;
And a heat exchange temperature sensor 15 that detects the temperature of the hot water near the outlet of the hot water supply heat exchanger 6 and outputs the detected temperature to the controller 4.

A gas supply pipe 16 for supplying a fuel gas to the hot water supply burner 5 has an original gas solenoid valve 17 opened and closed by a control signal from the controller 4, and hot water supply gas solenoid valves 18 and 19; Is provided with a hot water supply gas proportional valve 20 whose opening is adjusted by the control signal.

Reference numeral 21 denotes a hot-water supply combustion fan for supplying combustion air to the hot-water supply burner 5, the rotation speed of which is variable by a control signal from the controller 4. Reference numeral 22 denotes a hot water supply ignition plug that receives a high voltage through an igniter 23 in response to a control signal from the controller 4 and ignites the hot water supply burner 5. Reference numeral 24 denotes a hot water supply that detects the combustion state of the hot water supply burner 5 and outputs it to the controller 4. It is a frame rod. 27
Is a pressure relief valve and a water tap for releasing the pressure when the pressure in the hot water supply heat exchanger 6 rises and for draining water in the hot water supply heat exchanger 6 and the hot water supply pipe 11.

On the other hand, the reheating unit 3 includes a bath heat exchanger 41 heated by a bath burner 40 operated by a control signal from the controller 4, and a hot water in a bathtub 42 by a control signal from the controller 4. Bath heat exchanger 4
1, a circulation pump 44, a bath temperature sensor 45 that detects the temperature of hot water in the bathtub 42 and outputs it to the controller 4, and a water flow that detects the presence or absence of a water flow in the circulation path 43 and outputs it to the controller 4. A switch 46 is provided.

Further, a gas supply pipe 16 for supplying a fuel gas to the bath burner 40 has a bath gas solenoid valve 47 which is opened and closed by a control signal from the controller 4 and a gas governor for maintaining a constant fuel gas supply amount. 48 are provided.

Reference numeral 49 denotes a bath combustion fan for supplying combustion air to the bath burner 40, the rotation speed of which is varied by a control signal from the controller 4. Reference numeral 50 denotes a bath ignition plug to which a high voltage is applied from the igniter 23 according to a control signal from the controller 4 to ignite the bath burner 41. Reference numeral 51 denotes a bath frame rod for detecting the combustion state of the bath burner and outputting the detected state to the controller 4.

The circulation path 43 is connected to the hot water supply pipe 25 via a pouring solenoid valve 52, a bath hot water supply pipe 53, and a three-way valve 54 which are opened and closed by a control signal from the controller 4. Thereby, hot water is supplied from hot water supply unit 2 to bathtub 42 by opening pouring electromagnetic valve 52. Reference numeral 56 denotes a flow rate sensor that detects the flow rate of hot water supplied to the bathtub 42 and outputs the same to the controller 4. Reference numeral 57 denotes a water level sensor that detects the level of hot water in the bathtub 42 using hydrostatic pressure and outputs the same to the controller 4.

The controller 4 includes hot water supply control means 31 and additional heating control means 32, and includes a CPU, a ROM, and a RAM.
The hot water supply unit 2 and the additional heating unit 3 are controlled in accordance with various operation modes instructed by the remote controller 30.

Referring to FIG. 2, remote controller 30 provides an operation switch 60 for instructing the start and stop of the operation of hot water supply device 1 as a whole, and supplies a predetermined amount of hot water to bathtub 42, and after the hot water supply, a predetermined boiling water is supplied. An automatic switch 61 for instructing the start of automatic operation for performing additional heating up to the raised temperature, a hot water supply temperature switch 62 for setting a target temperature to the hot water supply pipe 25, and a clock time setting mode for setting a time of a built-in clock are designated. A clock setting switch 63, a reservation setting switch 64 for specifying a reservation time setting mode for setting a reservation time for the automatic operation,
In the clock time setting mode and the reservation time setting mode,
A time setting switch 65 for setting each time, a minute setting switch 66, a reservation operation switch 67 for setting the reservation for the automatic operation, and execution of a warming operation for keeping the temperature of hot water in the hot water supply heat exchanger 6 within a predetermined range. A heat retention switch 68 for instructing
A display section 69 for displaying hot water supply temperature, time, and the like.

When the user operates the operation switch 6 of the remote controller 30
When 0 is operated, the entire hot water supply apparatus 1 starts operating, and the operation lamp 70 built in the operation switch 60 is turned on.
In this state, when the user opens the callan 26 connected to the tip of the hot water supply pipe 25, water supply to the water supply pipe 7 is started,
The flowing water sensor 10 detects flowing water. Controller 4
When the start of water supply to the water supply pipe 7 is recognized based on the output from the flowing water sensor 10, the hot water supply combustion fan 21 is operated, the original gas solenoid valve 17, the hot water supply gas solenoid valves 18, 19 are opened, and the igniter A high voltage is applied to 23 and a spark discharge is generated in the hot water supply ignition plug 22 to perform the ignition processing of the hot water supply burner 5.

When the hot water supply control means 31 provided in the controller 4 recognizes that the hot water supply burner 5 has been ignited by the output of the hot water supply frame rod 24, the detected temperature of the hot water supply temperature sensor 14 and the remote control 30 The hot water gas proportional valve 20 is adjusted so that the set hot water supply target temperature matches.
Hot water supply control is performed to adjust the opening degree of the hot water supply combustion fan 21, the opening and closing of the hot water supply gas solenoid valves 18 and 19, the opening degree of the water volume servo 8, and the opening degree of the bypass servo 13. As a result, hot water at the temperature set by the user is supplied from the curan 26.

When the user operates the automatic switch 61 of the remote controller 30, the controller 4 starts the above-mentioned automatic operation, and opens the pouring solenoid valve 52 first. By opening the pouring solenoid valve 52, water supply to the water supply pipe 7 is started,
The hot water supply burner 5 is ignited in the same manner as when the user opens the curran 26 described above, and the hot water supply pipe 11 is used to supply the hot water supply electromagnetic valve 52, the bath hot water supply pipe 53, the three-way valve 54, and the
The hot water supply at the hot water supply target temperature is started via 3.

The controller 4 accumulates the amount of hot water supplied to the bathtub 42 based on the output from the flow rate sensor 56, and closes the pouring solenoid valve 52 when the accumulated value reaches the filling level.
The supply of a predetermined amount of hot water (hot water) to the bathtub 42 ends.

After completion of filling the bath tub 42, the controller 4 detects the temperature of the hot water in the bath tub 42 based on the output of the bath temperature sensor 45, and when the detected temperature is lower than the boiling temperature, the controller sets the boiling temperature. Until the hot water in the bathtub 42 is heated.

In order to raise the temperature, the additional heating control means 32 provided in the controller 4 operates the bath pump 44 to circulate the hot water in the bathtub 42 through the circulation path 43 and to heat the bath combustion fan 49. Is operated, the original gas solenoid valve 17 and the bath gas solenoid valve 47 are opened, a high voltage is applied to the bath ignition plug 50 via the igniter 23 to generate spark discharge, and the bath burner 40 is ignited. .

When the additional heating control means 32 recognizes from the output of the bath frame rod 51 that the bath burner 40 has been ignited, the temperature detected by the bath temperature sensor 45 reaches the boiling temperature. Until the above, the combustion of the bath burner 40 is continued. Thereby, the temperature of the hot water in the bathtub 42 is raised to the boiling temperature.

The additional heating control means 32 keeps the temperature of the hot water in the bathtub 42 at the boiling temperature for approximately 4 hours after the hot water in the bathtub 42 reaches the boiling temperature. Thus, the bath heat keeping operation of intermittently burning the bath burner 40 is performed. Then, during the bath heat keeping operation, the heat keeping mark 72 is displayed on the display section 69 of the remote controller 30.

When the user operates the automatic switch 61 of the remote controller 30 and recognizes from the output of the water level sensor 57 that the bath tub 42 is already filled with water, the controller 4 switches the bath tub. 42 is not filled, but only additional heating up to the above-mentioned boiling temperature is performed.

When the user operates the reservation operation switch 67, the reservation operation is set, and the reservation mark 71 is displayed on the display section 71 of the remote controller 30. The reservation setting switch 64, the hour switch 65, and the minute switch 6
The automatic operation described above is executed when the preset reservation time is reached in 6.

Next, when the user operates the heat retention switch 68, the hot water supply control means 31 sets the temperature of the hot water in the hot water supply heat exchanger 6 within a predetermined temperature range for a predetermined time (for example, one hour). Carry out the keeping warm operation. The warming operation is a process for reducing the time (delay time) from when the user opens the curan 26 to when the hot water is actually supplied to the curan 26.

As described above, the hot water supply burner 5 is ignited when the flowing water sensor 10 recognizes that water supply to the heat exchanger 6 has started. And at this time, hot water supply pipe 2
5, the water stays in the hot water supply pipe 11 and the heat exchanger 6. Therefore, the hot water is supplied from the curan 26 after the water staying in the hot water supply pipe 25, the hot water supply pipe 11, and the heat exchanger 6 is supplied. The length of the pipe in the hot water supply heat exchanger 6 is, for example, 2.5 m.

Therefore, by keeping the temperature of the hot water in the hot water supply heat exchanger 6 in advance, the amount of water to be supplied before the hot water supply is started can be reduced to only the amount of water retained in the hot water supply pipe 25 and the hot water supply pipe 11. It is possible to reduce the delay time from when the user opens the curran 26 to when the hot water supply is actually started.

Hereinafter, with reference to the flowcharts of FIGS. 3 to 5, the details of the process of controlling the warming operation (warming control) by the hot water supply control means 31 will be described.

Referring to FIG. 3, when the user operates heat retention switch 68 in STEP 1, hot water supply control means 31 starts the heat retention control, and turns on reception lamp 73 built in heat retention switch 68 in STEP 2; Executes subroutine A. The processing content of the subroutine A will be described later.

Next, in STEP 4, it is determined whether or not 5 minutes (corresponding to the predetermined time of the present invention) have elapsed since the stoppage of combustion of the hot water supply burner 5. Although the setting time of 5 minutes will be described later in detail, the temperature of the hot water in the hot water supply heat exchanger 6 becomes uniform after the combustion of the hot water supply burner 5 is stopped, and the temperature of the hot water in the hot water supply heat exchanger 6 is reduced. , The time required for the heat exchange temperature sensor 15 to match.

Then, hot water supply control means 31 determines in STEP 5
Is determined based on the hot water temperature detected by the hot water temperature sensor 9 and the hot water target temperature set by the hot water temperature switch 62 of the remote controller 30. . In hot water supply apparatus 1 of the present embodiment, hot water supplied from hot water supply heat exchanger 6 via hot water supply pipe 11 and water supplied from water supply pipe 8 via bypass pipe 12 have hot water supply target temperatures. And supplied to the hot water supply pipe 25. Therefore, it is necessary to determine the warming start temperature of the hot water in the hot water supply heat exchanger 6 and a warming target temperature, which will be described later, according to both the hot water supply temperature and the hot water supply target temperature.

If the temperature of the hot water in the hot water supply heat exchanger 6 detected by the heat exchange temperature sensor 15 is equal to or higher than the heat retention start temperature in STEP 6, the process branches to STEP 21 and the remote controller 3
In the display unit 69 of 0, an OK mark 74 indicating that the hot water in the hot water supply heat exchanger 6 is maintained in the range from the heat retention start temperature to the heat retention target temperature is displayed. The hot water supply from the hot water supply heat exchanger 6 and the hot water supply from the bypass pipe 12 depend on the detection value of the supply water temperature by the supply water temperature sensor 53 and the detection value of the temperature of the hot water in the hot water supply heat exchanger 6 by the heat exchange temperature sensor 15. The temperature when the water supply is mixed is adjusted so as to match the hot water supply target temperature.

On the other hand, in STEP 6, the heat exchange temperature sensor 15
When the temperature of the hot water in the hot water supply heat exchanger 6 detected by the above is lower than the heat retention start temperature, the process proceeds to STEP 7, the first time since the heat retention switch 73 is operated, or the hot water supply control is stopped (STEP 66 in subroutine A). If it is the first processing after that, the process proceeds to STEP 8 to clear the counter variable C. The function of the counter C will be described later.

In STEP 9, it is detected whether or not water remains in the hot water supply heat exchanger 6. In the present embodiment, the presence / absence of water is detected by using a thermistor for the heat exchange temperature sensor 15 and applying a high voltage to the thermistor to cause self-heating by applying a high voltage to the thermistor. When the temperature decrease rate of the thermistor after stopping the application of water is when the thermistor is in water (water is present in hot water supply heat exchanger 6)
And when it is in the air (no water in the hot water supply heat exchanger 6).

If it is determined in STEP 9 that there is water in the hot water supply heat exchanger 6, STEP 10 to STEP 11
Then, in the same manner as in STEP 5, the target heat retention temperature, which is the temperature at which combustion of the hot water supply burner 5 is stopped, is set by the water supply temperature detected by the water supply temperature sensor 9 and the hot water temperature switch 62 set by the remote control 30. Determined according to the hot water supply target temperature.

Then, in STEP 12, the combustion time T of the hot water supply burner 5 necessary for raising the temperature of the hot water in the hot water supply heat exchanger 6 from the heat retention start temperature to the heat retention target temperature is calculated. The calculation of the combustion time T is based on the hot water supply gas solenoid valve 1.
The control is performed based on the heating amount of the hot water supply gas burner when both the valves 8 and 19 are opened and the opening degree of the hot water supply gas proportional valve is set to the minimum opening degree at which the hot water supply burner can burn.

Next, in STEP 13, the hot water supply gas solenoid valve 1
8 and 19 are both opened, and the hot water supply gas proportional valve is set to the minimum opening capable of burning the hot water supply burner, and the hot water supply burner 5 is opened.
Start burning. In this way, the entire hot water supply burner 5 is burned with the amount of combustion minimized, so that the hot water supply heat exchanger 6
While suppressing the rapid rise in the temperature of the hot water in the hot water supply heat exchanger 6, the variation in the temperature of the hot water in the hot water supply heat exchanger 6 is reduced,
The hot water supply burner 5 is prevented from frequently repeating combustion and stop of combustion.

Next, in STEP 14, a timer T for starting the combustion time T calculated in STEP 12 as a set time is started, and S
Wait for the timer T to expire at TEP15,
In step 16, the combustion of the hot water supply burner 5 is stopped, and
If the OK mark 74 is not displayed on the display section 69 in step 17, the OK mark 74 is displayed in step 18 and the ST
Return to EP4.

Thereafter, the processing of STEP4 to STEP18 is repeated, and when the temperature detected by the heat exchange temperature sensor 15 becomes lower than the heat retention start temperature in STEP6, STEP13 to STEPS
The hot water supply burner 5 is operated in TEP16. This allows
The temperature of the hot water in the hot water supply heat exchanger 6 is maintained within the range from the heat retention start temperature to the heat retention target temperature.

By the way, during the heat retention control, the hot water supply heat exchanger 6
The hot water inside is in a stagnant state, and the hot water supply burner 5 is arranged below the hot water supply heat exchanger 6. Therefore, when the hot-water supply burner 5 is burned, the temperature of the lower part of the hot-water supply heat exchanger 6 approaching the hot-water supply burner 5 becomes higher than that of the upper part of the hot-water supply heat exchanger,
It becomes higher than the vicinity of the outlet of the hot water supply heat exchanger 6 where the heat exchange temperature sensor 15 is arranged.

Therefore, immediately after the hot water supply burner 5 is stopped, it is determined whether or not the temperature detected by the heat exchange temperature sensor 15 is lower than the heat retention temperature. In the lower part of the hot water supply heat exchanger 6 in which the temperature of the hot water is higher than the temperature, the hot water may be heated more than necessary to reach boiling. Such boiling is not desirable because it causes deterioration of the hot water supply heat exchanger 6 and gives the user discomfort due to the boiling sound.

Therefore, hot water supply control means 31 determines in STEP 1
After stopping the combustion of the hot water supply burner 5 at 6, 5
After waiting for a lapse of minutes, it is determined in STEP 6 whether the detected temperature of the heat exchange thermistor 15 is lower than the heat retention start temperature. During the time period of 5 minutes, after the combustion of the hot water supply burner 5 is stopped, the temperature of the hot water in the hot water supply heat exchanger 6 is made uniform by diffusion or substitution, and the heat exchange temperature sensor 15 provided near the outlet of the hot water supply heat exchanger 6 is provided. Is the time when it is assumed that the detected temperature of the hot water matches the temperature of the hot water in the hot water supply heat exchanger 6.

As described above, after the temperature detected by the heat exchange temperature sensor 15 matches the temperature of hot water in the hot water supply heat exchanger 6, S
By determining whether or not the temperature detected by the heat exchange temperature sensor 15 has become lower than the heat retention start temperature in the TEP 6, the boiling of the hot water in the hot water supply heat exchanger 6 described above is prevented.

When the temperature detected by the heat exchange temperature sensor 15 is equal to or higher than the heat retention start temperature in STEP 6, it is not necessary to burn the hot water supply burner 5, so the process branches to STEP 21 and the OK mark 74 is displayed on the display section 69. And STEP2
In step 2, the opening degree of the bypass servo 13 is adjusted according to the temperatures detected by the heat exchange temperature sensor 15 and the feed water temperature sensor 9.

Next, the processing contents of the subroutine A will be described. STEP 50 is a detection unit for detecting the OFF operation of the heat retention switch 68, and the user turns off the heat retention switch 68.
When operated, the process branches to STEP60, and when the hot water supply burner 5 is burning, the combustion of the hot water supply burner 5 is stopped at STEP64. Then, in step 61, the display of the OK mark on the display unit 69 is turned off.
Then, the reception lamp 73 built in is turned off, and the heat retention control ends.

STEP 51 is an opening / closing detection section for the curan 26. When the user opens the curan 26 and detects water supply to the water supply pipe by the output of the flowing water sensor 10, the hot water supply control means 31 returns to a standby state described later in STEP 65. The flag F is reset (F = 0), a one-hour timer described later is reset in STEP 66, and the hot water supply control described above is performed in STEP 67 until the stop of water supply is detected from the output of the water flow sensor 10 in STEP 68.

STEP 52 is a determination section for determining whether or not a standby flag F indicating that a one-hour timer described later has expired is set (F = 1), and the standby flag F is set (F = 1) If it is, S
The process branches to TEP50 to execute a wait loop of STEP50 to STEP52.

STEP 53 is a one-hour timer activation judging section. This one-hour timer manages one hour, which is the execution time of the heat retention control. If the one-hour timer is not operating in STEP53, the one-hour timer is started in STEP54. That is, when the subroutine A is first executed after the heat retention control switch 73 is operated, and when water supply is detected in STEP 51 and STEP 65 to STE
After the hot water supply operation of P67 is completed, first, the subroutine A
Is executed, a one hour timer is started.

In the flowcharts of FIGS. 3 and 4, the subroutine A is sequentially executed in each waiting loop.
When the one-hour timer expires at 5, the STE
At P56, the presence or absence of combustion of the hot water supply burner 5 is determined, and when the hot water supply burner 5 is burning, the combustion of the hot water supply burner 5 is stopped at STEP 67. Subsequently, in step 57, the standby flag F is set (F = 1). In step 58, the display of the OK mark on the display unit 69 is turned off to notify the user that the one-hour heat retention control has been completed, and the process returns to step 50. , A wait loop of STEP50 to STEP52 is executed.

Incidentally, STEP 24 in the flowchart of FIG.
Step 28 is a process for dealing with water leakage.
That is, when the tenth combustion of the hot water supply burner 5 becomes necessary before the one-hour timer expires, the temperature of the hot water in the hot water supply heat exchanger 6 rapidly drops, and the water is supplied to the hot water supply pipe 11 or the like. Since there is a leak point, the hot water supply heat exchanger 6
It is determined that water is being supplied to
The process branches to STEP26, prohibits the heat retention control, and proceeds to STEP27.
The display of the OK mark 74 on the display unit 69 is turned off.

In the present embodiment, a hot water supply device using a gas burner as a heating means is shown, but the present invention is also applicable to a hot water supply device using a kerosene burner, an electric heater or the like as a heating means. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a hot water supply device of the present invention.

FIG. 2 is an external view of a remote controller provided in the water heater shown in FIG.

FIG. 3 is an operation flowchart of the water heater shown in FIG. 1;

FIG. 4 is an operation flowchart of the water heater shown in FIG. 1;

FIG. 5 is an operation flowchart of the water heater shown in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus, 2 ... Hot water supply part, 3 ... Additional heating part, 4 ... Controller, 5 ... Hot water supply burner, 6 ... Hot water supply heat exchanger, 7 ... Water supply pipe, 8 ... Water quantity servo, 9 ... Water supply temperature sensor, 10 ... Running water sensor, 11 hot water supply pipe, 12 bypass pipe, 13 bypass servo, 14 hot water temperature sensor, 15 heat exchange temperature sensor, 16 gas supply pipe, 17 original gas solenoid valve, 18,
19: Hot water supply gas solenoid valve, 20: Hot water supply gas proportional valve, 21 ...
Hot water supply combustion fan, 22 hot water supply spark plug, 23 igniter, 24 hot water supply frame rod, 25 hot water supply pipe, 2
6 ... Karan, 27 ... Overpressure safety valve / water tap, 30 ... Remote control, 31 ... Hot water supply control means, 32 ... Additional heating control means, 40
... bath burner, 41 ... bath heat exchanger, 42 ... bathtub, 43
... circulation path, 44 ... circulation pump, 45 ... bath temperature sensor,
46 ... water flow switch, 47 ... bath gas solenoid valve, 48 ... bath gas governor, 49 ... bath combustion fan, 50 ... bath ignition plug, 51 ... bath frame rod, 52 ... pouring solenoid valve, 53 ... bath hot water supply pipe, 54 ... Three-way valve, 56: flow rate sensor, 57: water level sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24H 1/00 602 F24H 1/10 302

Claims (1)

(57) [Claims] A heat exchanger supplied with water by a water supply pipe ;
Heats water in the heat exchanger by being placed below the heat exchanger
Heating means , a hot water supply pipe from which hot water heated by the heat exchanger is discharged, a hot water supply temperature sensor for detecting a temperature of hot water supplied from the hot water supply pipe, and a hot water supply sensor formed at an upper portion of the heat exchanger. a heat exchange temperature sensor for detecting the temperature of hot water near the outlet, a flowing water sensor for detecting the presence or absence of flowing water passing through the heat exchanger, and the hot water supply when flowing water is detected by the flowing water sensor. Hot water supply control for adjusting the heating amount of the heating means so that the temperature detected by the temperature sensor matches a predetermined hot water supply target temperature;
When running water is not detected by the running water sensor ,
Hot water supply control means for performing heat retention control for operating the heating means for a heating time determined in accordance with a predetermined heat retention target temperature when a temperature detected by the heat exchange temperature sensor is lower than a predetermined heat retention start temperature; In the hot water supply apparatus, when the hot water supply control means stops the heating means in the heat retention control, the hot water supply control means then stays in the heat exchanger.
The temperature of the retained hot water is made uniform by diffusion and substitution of the hot water,
The temperature of the hot water supply temperature sensor is different from the temperature of the hot water in the heat exchanger.
The hot water supply apparatus does not operate the heating means until a predetermined time that is assumed to be the same elapses, even if the temperature detected by the heat exchange temperature sensor is lower than the heat retention start temperature.