JPH11141971A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device which promotes the uniform temperature of hot water in a heat exchanger whose temperature is controlled to be retained. SOLUTION: A hot water supply device comprises a heat exchanger 6, a hot water supply pipe 11, a heat exchanger temperature sensor 15 for detecting the temperature of hot water near the outlet of the heat exchanger 6, a water flow sensor 10 for detecting the presence or absence of water flow, a bypass pipe 12 for mixing a part of water supplied from a water supply pipe 7 into the hot water supply pipe 11, a bypass opening degree adjusting means 13, a hot water temperature sensor 14, and a hot water supply control means for controlling the supply of hot water and the control of a heat retaining operation for operating a heating means 5 during heating time corresponding to target heat retaining temperature, when the water flow is not detected by the water flow sensor 10, and the detected temperature of the heat exchanger temperature sensor 15 is lower than temperature at which the heat retaining operation is started. The hot water supply control means 31 opens the bypass pipe 12 to its maximum degree under heat retaining control, during at least one of operation of the heating means 5 and prescribed time after the stop of the heating means 5.

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 instant gas hot water supply system, a hot water supply heat exchanger that is heated by a hot water supply burner to raise the temperature of water supplied from a water supply pipe, and a hot water supply from the hot water supply heat exchanger via a hot water supply pipe. A bypass pipe for mixing a part of water supplied from a water supply pipe with hot water to be supplied, a bypass servo for adjusting an opening degree of the bypass pipe, a hot water supply temperature sensor for detecting a temperature of the mixed hot water, 2. Description of the Related Art There is known a device provided with a flowing water sensor for detecting the presence or absence of flowing water passing through an exchanger.

[0003] In such a gas hot water supply apparatus, a user opens a callan or the like connected to the tip of a hot water supply pipe,
When water supply to the heat exchanger is started and flowing water passing through the heat exchanger is detected by the flowing water sensor, the gas burner is activated in response to the detection of the flowing water, and heating of the water in the heat exchanger is started. Is done. Then, the combustion amount of the gas burner and the opening degree of the bypass pipe are adjusted so that the detection temperature of the hot water supply temperature sensor matches a predetermined target hot water supply temperature.

[0004] Here, the combustion of the gas burner is started when the user opens the callan and the flowing water passing through the heat exchanger is detected by the flowing water sensor as described above. Therefore, the hot water that has passed through the heat exchanger and is mixed with the water from the bypass pipe and actually supplied from the kallang is the water that has accumulated in the hot water supply pipe from the heat exchanger to the kallang. In addition to the water remaining in the heat exchanger after being supplied from the karan. For this reason, there is a time delay from when the user opens the curan to when the hot water is actually supplied to the curan, which is inconvenient to use.

In order to reduce such a 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 from the heat exchanger to the hot water supply pipe is provided. Even when hot water supply is stopped (when running water is not detected by the running water sensor), a gas hot water supply device that performs heat keeping control to operate the gas burner intermittently so that the temperature detected by the heat exchange temperature sensor is maintained in a predetermined range. Are known (JP-A-9-243169 and the like). The reason why the heat exchange temperature sensor is provided not in the heat exchanger but in the vicinity of the outlet of the heat exchanger is to avoid the effect of 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 within 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. The amount of water to be supplied can be limited to the water staying in the hot water supply pipe from the heat exchanger to the curan, so that the delay time until hot water is supplied to the curan is shorter than when the heat retention control is not performed. be able to.

However, unlike the hot water supply, the heat retention control is performed in a state where there is no flowing water in the heat exchanger and water remains. And since the gas burner is generally arranged at the lower part of the heat exchanger, when the heat exchanger is heated in such a state that the water stays, the temperature of the hot water in the lower part of the heat exchanger is higher than that in the upper part. As the temperature increases, it is difficult for convection or replacement of the hot water to occur even after the burner combustion is stopped.

[0008] If the hot water supply is started in a state where the temperature of the hot water in the heat exchanger is not uniform, the temperature of the hot water to be supplied fluctuates, giving a user an inconvenience.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply apparatus which solves the above-mentioned inconveniences and promotes uniform temperature of hot water in a heat exchanger during heat retention control.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heat exchanger for heating water supplied from a water supply pipe by a heating means, and hot water heated by the heat exchanger. A hot water supply pipe, a heat exchange temperature sensor for detecting the temperature of hot water near the outlet of the heat exchanger, a flowing water sensor for detecting the presence or absence of flowing water passing through the heat exchanger, and water supplied from the water supply pipe. A bypass pipe for mixing a part of the bypass pipe into the hot water supply pipe, bypass opening degree adjusting means provided in the middle of the bypass pipe to adjust an opening degree of the bypass pipe, and a junction of the bypass pipe and the hot water supply pipe A hot water supply temperature sensor for detecting the temperature of the hot water on the downstream side of the hot water supply means, and the heating means so that the detected temperature of the hot water supply temperature sensor matches a predetermined hot water supply target temperature when the flowing water is detected by the flowing water sensor. Heating amount and the bypass opening Hot water supply control for adjusting the degree of opening of the node means, and when flowing water is not detected by the flowing water sensor, when the temperature detected by the heat exchange temperature sensor falls below a predetermined heat retention start temperature, the heating means And a hot water supply control unit that performs a heat retention control that operates during a heating time according to a predetermined heat retention target temperature, wherein the hot water supply control unit performs the heat retention control while the heating unit is operating. And at least one of a predetermined time after the heating means is stopped, wherein the bypass opening adjusting means sets the bypass pipe to the maximum opening degree.

According to the present invention, the hot water supply control means may include, in the heat retention control, at least one of a time during which the heating means is operated and a predetermined time after the hot water supply control means is stopped. The bypass pipe is set to the maximum opening by the bypass opening control means. in this way,
By setting the bypass pipe to the maximum opening degree, the inlet and the outlet of the heat exchanger communicate with each other to form a circulation path. Accordingly, as the hot water at the lower part of the heat exchanger rises to the upper part of the heat exchanger, the hot water at the lower part of the heat exchanger easily flows into the hot water supply pipe and the bypass pipe. For this reason, convection and replacement are more likely to occur in the heat exchanger, and the time during which the temperature of the hot water in the heat exchanger becomes uniform can be reduced.

A water supply temperature sensor for detecting a temperature of water supplied from the water supply pipe; and the hot water supply control means includes a water supply temperature detected by the water supply temperature sensor and a water supply temperature sensor detected by the heat exchange temperature sensor. A bypass opening determining means for determining an opening of the bypass pipe so that a hot water supply temperature downstream of the junction becomes the hot water supply target temperature in accordance with a hot water temperature from the heat exchanger; Hot water supply control means,
In the heat retention control, when the operation of the heating means is started, when the detected temperature of the heat exchange temperature sensor is lower than a reference temperature determined in relation to the heat retention start temperature, the heating means is activated. While, and at least one of the predetermined time after the stop of the heating means,
The bypass pipe is opened at a first opening degree that is the maximum opening degree that can be adjusted by the bypass opening degree adjusting means, and when the temperature detected by the heat exchange temperature sensor is equal to or higher than the reference temperature, the hot water temperature from the heat exchanger is reduced. A second opening, which is a bypass opening when the temperature is replaced with the heat retention target temperature, is determined by the bypass opening determining means, and while the heating means is operating, and for a predetermined time after the heating means is stopped. The bypass pipe is opened at the second opening during at least one of the steps.

In the heat retention control, in order to promote uniformity of the temperature of the hot water in the heat exchanger, the opening degree of the bypass pipe is set when the heating means is operated and for a predetermined time after the operation is stopped. It is more effective to increase as much as possible.
However, in the heat retention control, considering the case where the hot water supply control is started during the operation of the heating means, in order to shorten the rising time until the hot water is supplied at the hot water supply target temperature, the bypass pipe is required to be heated. The opening is not fully open,
It is better to set the opening near the opening when hot water is supplied at the hot water supply target temperature.

Therefore, in the present invention, the hot water supply control means includes:
In the heat retention control, the opening degree of the bypass pipe is varied according to the temperature detected by the heat exchange temperature sensor when the operation of the heating means is started. That is, when the temperature detected by the heat exchange temperature sensor is low (less than the reference temperature), the opening degree of the bypass pipe is set to the maximum opening degree (first opening degree), whereby the temperature of hot water in the heat exchanger is increased. When the detected temperature of the heat exchanger is high (not less than the reference temperature), the opening degree near the opening when the hot water is supplied at the hot water supply target temperature (second opening degree) is given priority. Thus, priority is given to shortening the rising time at the start of hot water supply. Accordingly, the heat retention control can be performed in consideration of both the equalization of the temperature of the hot water in the heat exchanger and the shortening of the rising time at the start of hot water supply.

[0015]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. 1 is an overall configuration diagram of the hot water supply apparatus of the present invention, FIG. 2 is an external view of a remote controller provided in the hot water supply apparatus shown in FIG. 1, and FIGS. 3 to 6 are operation flowcharts of the hot water supply apparatus shown in FIG. .

Referring to FIG. 1, hot water supply apparatus 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 of the present invention) which is heated by a hot water supply burner 5 (corresponding to a heating means of the present invention) operated by a control signal from a 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 by a control signal from the controller 4, and a supply water temperature TW are detected and output to the controller 4. A hot water supply temperature sensor 9, a running water sensor 10 which detects the presence or absence of flowing water passing through the hot water supply heat exchanger 6 and outputs it to the controller 4, a hot water supply pipe 11 from which hot water heated by the hot water supply heat exchanger 6 is discharged, a water supply pipe 7, a bypass pipe 12 for mixing a part of the water supplied to the hot water supply pipe 11 with a hot water supply pipe 11, and a bypass servo 13 for adjusting the opening degree of the bypass pipe 12 by a control signal from the controller 4.
(Corresponding to the bypass opening adjusting means of the present invention), hot water supply pipe 11
A hot water temperature sensor 14 for detecting the temperature of hot water in a hot water supply pipe 25 downstream of the junction of the hot water supply pipe and the controller 4 and a hot water temperature TH near the outlet of the hot water supply heat exchanger 6 are detected. And a heat exchange temperature sensor 15 that outputs the temperature to the controller 4.

A gas supply pipe 16 for supplying fuel gas to the hot water supply burner 5 has a source 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 comprises a bath heat exchanger 41 which is 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.

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, and its rotation speed is varied by a control signal from the controller 4. Reference numeral 50 denotes a bath ignition plug that receives a high voltage from the igniter 23 according to a control signal from the controller 4 and ignites the bath burner 40. 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 a hot water supply control means 31 and a reheating 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 apparatus 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 hot water supply target temperature TA to the hot water supply pipe 25, and a clock time setting mode for setting the time of a built-in clock. A clock setting switch 63 for specifying, a reservation setting switch 64 for specifying a reservation time setting mode for setting the reservation time of the automatic operation, and a time setting switch for setting each time in the clock time setting mode and the reservation time setting mode. 65, a minute setting switch 66, a reservation operation switch 67 for setting the reservation of the automatic operation, and a maintenance for keeping the temperature of hot water in the hot water supply heat exchanger 6 within a predetermined range. Having a thermal insulation switch 68 for instructing the execution of the operation, and a display unit 69 for displaying the hot water temperature and time, and the like.

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 from the output of the hot water supply frame rod 24 that the hot water supply burner 5 has been ignited, the detected temperature of the hot water supply temperature sensor 14 and the remote control 30 are used. The opening degree of the hot water supply gas proportional valve 20, the rotation speed 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 amount servo 8, and the bypass so that the set hot water supply target temperature TA matches. Hot water supply control for adjusting the opening of the servo 13 is executed. Thus, hot water is supplied from the curan 26 at the hot water supply target temperature TA set by the user.

In the hot water supply control, the target combustion amount of the hot water supply burner 5 is determined such that the temperature of the hot water from the heat exchanger 6 becomes the target hot water supply temperature set higher than the target hot water supply temperature TA. Accordingly, the opening degree of the hot water supply gas proportional valve 20, the rotation speed of the hot water supply combustion fan 21, and the opening and closing of the hot water supply gas solenoid valves 18 and 19 are controlled.

The bypass opening determination means 58 provided in the hot water supply control means 31 determines whether or not the hot water temperature TH from the hot water supply heat exchanger 6 detected by the heat exchange temperature sensor 15 is detected even when the hot water supply target temperature TA changes. The water supply temperature TW to the hot water supply heat exchanger 6 detected by the water supply temperature sensor 9 so as to be kept at the target water supply temperature (for example, the water supply temperature TW + 55 ° C.).
Then, the bypass ratio (the ratio of the flow rate of the water supplied from the bypass pipe 12 to the flow rate of the hot water from the hot water supply heat exchanger 6) Bb is determined based on the hot water supply target temperature TA.

The bypass opening determining means 58 calculates the outlet temperature from the hot water supply heat exchanger 6 based on the actual hot water temperature detected by the hot water temperature sensor 14, the hot water temperature TW, and the determined bypass ratio Bb. . Then, the bypass opening determining means 58 corrects the bypass ratio Bb by proportional control for adding or subtracting a constant ratio of a difference between the reversely calculated tapping temperature and the tapping target temperature TA to the bypass ratio Bb, and corrects the corrected bypass. Bypass servo 1 according to ratio Ba
3 is determined.

Then, the hot water supply control means 31 outputs a control signal corresponding to the opening degree of the bypass servo 13 determined by the bypass opening degree determining means 58 to the bypass servo 13.

Further, even when the hot water supply control means 31 determines the combustion amount of the hot water supply burner 5 and the opening degree of the bypass servo 13, the hot water supply temperature detected by the hot water supply temperature sensor 14, the target hot water supply temperature, and If they do not match, the combustion amount of the combustion burner 5 and the opening degree of the bypass servo 13 are corrected, and the flow rate of water supplied to the water supply pipe 7 is adjusted by the water volume servo 8.

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 has opened the curran 26 described above, and the hot water supply pipe 11 is supplied with the hot water supply electromagnetic valve 52, the bath hot water supply pipe 53, the three-way valve 54, and the circulation path 4.
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. If the detected temperature is lower than the boiling temperature, the boiling temperature Until the hot water in the bathtub 42 is heated.

In order to increase 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.

Note that the additional heating control means 32 keeps the temperature of the hot water in the bathtub 42 substantially at the boiling temperature for four 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 bathtub 42 is already filled with water, the controller 4 sets the bathtub. 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). Execute the heat retention control. This heat retention control 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 the start of supplying water to the heat exchanger 6. 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. The delay time from when the user opens the curran 26 to when the hot water supply is actually started can be reduced.

In the heat retention control, the bypass opening determining means 68 provided in the hot water supply control means 31 detects the hot water temperature TH from the hot water supply heat exchanger 6 detected by the heat exchange temperature sensor 15 and the hot water temperature sensor 9 to detect the hot water temperature. Supply water temperature TW
The opening degree of the bypass pipe 12 is determined according to the hot water supply target temperature TA so that the bypass ratio is as follows: bypass ratio = (TH−TA) / (TA−TW).

Hereinafter, the processing content of the heat retention control by the hot water supply control means 31 will be described in detail with reference to the flowcharts of FIGS.

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 five minutes have elapsed since the last stop of the hot water supply burner 5 (hot water supply combustion or heat retention combustion). During the set time of 5 minutes, 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 stops, and the temperature of the hot water in the hot water supply heat exchanger 6
This is the time assumed to be necessary for the heat exchange temperature sensor 15 to coincide.

If five minutes have not elapsed since the last combustion stop in STEP 4, the process branches to STEP 29,
The opening degree of the bypass pipe 12 is determined by the bypass opening degree determining means 58 according to the above equation, and the hot water supply controlling means 3
1 outputs a control signal corresponding to the determined opening degree to the bypass servo 13. In step 30, subroutine A is executed.

Then, hot water supply control means 31 determines in STEP 5
And the warming start temperature, which is the temperature at which the warming combustion of the hot water supply burner 5 is started, is changed to the feedwater temperature TW detected by the feedwater temperature sensor 9.
And target hot water supply temperature TA set by hot water supply temperature switch 62 of remote controller 30. In hot water supply apparatus 1 of the present embodiment, hot water supply heat exchanger 6 to hot water supply pipe 11
Hot water discharged through the water supply pipe 7 and the bypass pipe 12
Is supplied to the hot water supply pipe 25 after being mixed with the water supplied via the hot water supply so as to reach the hot water supply target temperature. 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 to be described later in accordance with both the hot water supply temperature TW and the hot water supply target temperature TA.

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 31 to execute the remote control 3
In the display section 69 of 0, an OK mark 74 indicating that the hot water in the hot water supply heat exchanger 6 is maintained at a temperature equal to or higher than the heat retention start temperature is displayed. In STEP 32, the opening degree of the bypass servo 13 is determined by the feed water temperature sensor 9. When the hot water supply from the hot water supply heat exchanger 6 and the water supply from the bypass pipe 12 are mixed according to the detected value of the feed water temperature and the detected value of the temperature of the hot water in the hot water supply heat exchanger 6 by the heat exchange temperature sensor 15. Is the hot water supply target temperature TA
Adjust to match.

On the other hand, in STEP 6, the heat exchange temperature sensor 15
If 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 for the first time since the heat retention switch 73 is operated or the first time since the hot water supply control is stopped. If, STEP8
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 exists 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. The temperature decrease rate of the thermistor after the application of water is stopped depends on whether the thermistor is in water (there is water in the hot water supply heat exchanger 6) or in the air (there is no water in the hot water supply heat exchanger 6). This is done using different things.

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 temperature for keeping the heat, which is the temperature at which the combustion of the hot water supply burner 5 is stopped, is set by the water supply temperature T W detected by the water supply temperature sensor 9 and the hot water temperature switch 62 of the remote controller 30. It is determined according to the hot water supply target temperature TA.

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 burner 5 when the hot water supply gas proportional valve 20 is opened to the minimum opening degree at which the hot water supply burner can burn.

Next, in STEP 13, the temperature TH of the hot water in the hot water supply heat exchanger 6 detected by the heat exchange temperature sensor 15 is determined.
Is determined to be lower than a reference temperature set at a temperature lower than the heat retention start temperature in relation to the heat retention start temperature. When the temperature TH of the hot water in the hot water supply heat exchanger is lower than the reference temperature, the process proceeds to STEP 14 and the bypass servo 13 sets the opening of the bypass pipe 12 to the maximum opening (first opening).

As a result, the inlet and outlet of the hot water supply heat exchanger 6 communicate with each other at the maximum degree of opening through the bypass bus 12, and the temperature is raised when the lower part of the hot water supply heat exchanger 6 is heated by the hot water supply burner 5. When the hot water rises above the hot water supply heat exchanger 6,
The low-temperature hot water at the upper portion easily flows into the hot water supply pipe 11. For this reason, convection and replacement of the hot water in the hot water supply heat exchanger 6 are likely to occur, and the uniformity of the temperature of the hot water in the hot water supply heat exchanger 6 is promoted.

On the other hand, in STEP 13, the heat exchange temperature sensor 1
When the temperature TH in the hot-water supply heat exchanger 6 detected by step 5 is equal to or higher than the reference temperature, the flow proceeds to step 39.
At this time, since the hot water in the hot water supply heat exchanger 6 is already at a somewhat high temperature, the combustion time T of the hot water supply burner 5 calculated in STEP 12 is short, and the hot water supply heat exchange by heating the hot water supply burner 5 is required. The variation in the temperature of the hot water in the vessel 6 is reduced. Then, it can be assumed that the temperature of the hot water supplied from the hot water supply heat exchanger 6 during heating is a temperature close to the heat retention target temperature.

Therefore, in this case, rather than making the temperature of the hot water in the hot water supply heat exchanger 6 uniform, the hot water supply to the curan 26 at the previous hot water supply target temperature actually starts after the user opens the curan 26. The processing prioritizes the shortening of the time (hot water supply start-up time).

That is, the bypass opening determination means 58 determines the opening of the bypass pipe 12 so that the bypass ratio becomes the bypass ratio when the heat retention target temperature determined in STEP 11 is substituted for TH in the above-described equation. The control means 31 outputs a control signal of an operation amount corresponding to the determined opening to the bypass servo 13.

The bypass pipe 12 thus set is set.
The opening degree (second opening degree) of the water supply is determined by the bypass opening degree determining means 58 as described above when the user opens the curan 26 during the combustion of the hot water supply burner 5 and switches from the heat retention control to the hot water supply control. The bypass pipe 12 corresponding to the bypass ratio Ba determined based on the feed water temperature Tw to the hot water feed heat exchanger 6 detected by the temperature sensor 9 and the hot water target temperature TA.
(Third opening).

Therefore, when the user opens the curan 26 and starts hot water supply control, the amount of adjustment of the opening degree of the bypass pipe 12 (second opening degree−
The third opening degree) can be reduced, and the hot water supply rising time can be shortened.

When the opening degree of the bypass pipe 12 is set to the first opening degree (maximum opening degree) in STEP 14, the flow proceeds to STEP 14.
In step 15, the set time of the timer t is set to 3 minutes.
When the opening of the bypass pipe 12 is set to the second opening at 14, the set time of the timer t is set to 2 minutes at STEP 40,
In step 16, the timer t is started.

Subsequently, in step 17 the combustion of the hot water supply burner 5 is started, and in step 18 a timer T is started which uses the heating time T calculated in step 12 described above as a set time. When the timer T has timed out in STEP 19, the combustion of the hot water supply burner 5 is stopped in STEP 20,
It waits for the timer t to expire at EP21. By the waiting loop of STEP 21, the bypass pipe 12 is maintained at the first opening degree or the second opening degree until the timer t expires even after the combustion of the hot water supply burner 5 is stopped. Therefore, the uniformity of the temperature of the hot water in the hot water supply heat exchanger 6 is promoted.

When the timer t has expired in STEP 21, the process proceeds to STEP 22 and the remote controller 30
When the OK mark 74 is not displayed on the display section 69, the OK mark 74 is displayed in STEP 23 and the STE
Return to P4.

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
At TEP 20, hot water supply burner 5 is operated. 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.

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 31 and the OK mark 74 is displayed on the display section 69. And STEP3
In step 2, the operation amount of the bypass servo 13 is adjusted so that the bypass opening is determined by the bypass opening setting means 58.

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 the operation is performed, the process branches to STEP60, and when the hot water supply burner 5 is performing the heat keeping combustion, the combustion of the hot water supply burner 5 is stopped at STEP64. Then, in STEP61, the display unit 69 is OK.
The display of the mark is turned off, the reception lamp 73 built in the heat retention switch 68 is turned off in STEP 62, and the heat retention control ends.

STEP 51 is a detecting unit for detecting the presence or absence of water supply to the heat exchanger 6. When the user opens the curan 26 and detects the supply of water to the water supply pipe by the output of the water flow sensor 10, the hot water supply control means 31 is activated. , A standby flag F described later is reset (F = 0) in STEP 65, a one-hour timer described later is reset in STEP 66, and the STEE is performed until the stop of water supply is detected from the output of the water flow sensor 10 in STEP 68.
At P67, the above-described hot water supply control is performed.

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 shown in FIGS. 3 and 4, the subroutine A is sequentially executed in each waiting loop.
When the one-hour timer times out in step 5, ST
In EP56, 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 in 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 in order to inform the user that the one-hour heat retention control has been completed.
And the waiting loop of STEP50 to STEP52 is executed.

Incidentally, STEP 34 in the flowchart of FIG.
Step 38 is a process for dealing with water leakage.
That is, when the tenth (C = 10) combustion of the hot water supply burner 5 is required before the one-hour timer expires, the temperature of the hot water in the hot water supply heat exchanger 6 rapidly decreases,
It is determined that water is being supplied from the water supply pipe 7 to the hot water supply heat exchanger 6 because there is a leakage point in the hot water supply pipe 11 or the like.
The process branches from P35 to STEP36 to inhibit the heat retention control,
In step 37, the display of the OK mark 74 on the display unit 69 is changed to O.
FF.

In this embodiment, the bypass servo is used as the bypass opening adjusting means, but a proportional solenoid valve may be used.

Further, as shown in the present embodiment, in the heat retention control, the bypass pipes are provided both while the hot water supply burner 5 is burning and before the timer t expires after the combustion of the hot water supply burner is stopped. The effect of the present invention is maximized by opening the bypass pipe 12, but the bypass pipe 1 is provided only between the two.
2, the effect of the present invention can be obtained.

Further, in the present embodiment, a hot water supply apparatus using a gas burner as a heating means is shown, but the present invention is also applicable to a hot water supply apparatus 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;

FIG. 6 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 amount servo, 9 ... Water supply temperature sensor, 10 ... Flowing 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, 58: bypass opening determination means

Claims (2)

[Claims] 1. A heat exchanger for heating water supplied from a water supply pipe by a heating means, a hot water supply pipe from which hot water heated by the heat exchanger is discharged, and a hot water supply near an outlet of the heat exchanger. A heat exchange temperature sensor for detecting a temperature, a flowing water sensor for detecting the presence or absence of flowing water passing through the heat exchanger, a bypass pipe for mixing a part of water supplied from the water supply pipe into the hot water supply pipe, A bias opening adjusting means provided in the middle of the bypass pipe to adjust the opening of the bypass pipe, a hot water supply temperature sensor for detecting a temperature of hot water downstream of a junction of the bypass pipe and the hot water supply pipe, The amount of heating of the heating means and the degree of opening of the bypass opening degree adjusting means are adjusted so that the temperature detected by the hot water supply temperature sensor matches a predetermined hot water supply target temperature when flowing water is detected by the flowing water sensor. Hot water supply control to adjust and When the temperature of the heat exchange temperature sensor is lower than a predetermined heat retention start temperature when running water is not detected by the heat exchanger, the heating means is operated for a heating time according to a predetermined heat retention target temperature. A hot water supply device comprising: a hot water supply control unit that performs control and the hot water supply control unit, wherein, in the heat retention control, while the heating unit is operating, and during a predetermined time after the heating unit is stopped, A hot water supply control device, wherein at least one of the bypass pipes is set to a maximum opening degree by the bypass opening degree adjusting means. 2. A water supply temperature sensor for detecting a water supply temperature from the water supply pipe, wherein the hot water supply control means includes a water supply temperature detected by the water supply temperature sensor and a water supply temperature detected by the heat exchange temperature sensor. A bypass opening determining means for determining an opening of the bypass pipe so that a hot water supply temperature downstream of the junction becomes the hot water supply target temperature in accordance with a hot water temperature from the heat exchanger; The hot water supply control means, in the heat keeping control, when the operation of the heating means is started, when the detected temperature of the heat exchange temperature sensor is lower than a reference temperature defined in relation to the heat keeping start temperature, During the operation of the means, and during a predetermined time after the heating means is stopped, at least one of the first opening degree which is the maximum opening degree that can be adjusted by the bypass opening degree adjusting means. Ba When the temperature detected by the heat exchange temperature sensor is equal to or higher than the reference temperature, the second opening, which is the bypass opening when the temperature of the hot water from the heat exchanger is replaced with the target temperature, is set to the second opening. The bypass pipe is set at the second opening degree during the operation of the heating means and during at least one of a predetermined time after the heating means is stopped. The hot water supply device according to claim 1, wherein the hot water supply device is opened.