JPH09269148A - Complex hot water feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a complex hot water feeding device in which hot water showing a less amount of variation in hot water temperature when the hot water is discharged again even if a bath burner is ignited during a stopped state of hot water feeding combustion. SOLUTION: When a bath burner combustion is carried out within a period (a setting wait time) in which a stabilization of temperature of hot water to be fed again during a stopped state of hot water feeding combustion can be attained, a bath capability reduction control section 1 estimates and detects a temperature of residual hot water in response to a data of temperature characteristic of the residual hot water in a hot water feeding heat exchanger made at a hot temperature estimating section 2, a bath combustion capability is controlled to be lower than a normal set combustion capability during a normal operation in response to a displacement amount where this estimated temperature of hot water is displaced in respect to a set temperature of feeding hot water, and a cooling promoting phenomenon of the residual hot water caused by a rotational driving of a combustion fan or a post-boiling temperature increasing phenomenon is restricted. A memory 8 stores in advance data in a releasing segment arranged before a terminal point from the terminal point of a set waiting time. In the case that the bath burner combustion is not detected from a stopped state of hot water feeding combustion to a starting time of releasing section, a capability reduction control stopping section 5 does not start its subsequent bath capability reduction controlling operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined water heater having a hot water supply function and a bath function.

[0002]

2. Description of the Related Art FIG. 4 shows a model example of a combined water heater having a hot water supply function and a bath function. In the figure, the appliance has a hot water supply combustion chamber 31 and a bath combustion chamber 32, and an exhaust port 42 common to both combustion chambers 31 and 32 is provided. A hot-water supply burner 11 is arranged below the hot-water supply combustion chamber 31, and a bath burner 12 is arranged below the bath combustion chamber 32.A common supply is provided below the hot-water supply burner 11 and the bath burner 12. A combustion fan 10 for exhaust is arranged, and the combustion fan 10 has a fan rotation detection sensor 45 for detecting fan rotation information.
Are arranged. Fuel gas is distributed and supplied to the hot water supply burner 11 and the bath burner 12 through a gas supply passage 34.

In the gas supply passage 34, a solenoid valve 35 for opening and closing the passage, a proportional valve 22 for controlling the gas supply amount to the burner by the opening amount, and a passage for gas supply of the hot water supply burner 11 are opened and closed. A solenoid valve 50 for performing the above and a solenoid valve 49 for opening and closing the passage for gas supply of the bath burner 12 are incorporated.
Further, igniter electrodes 26, 27 for igniting fuel gas and frame rod electrodes 28, 29 for detecting flames of the burner are provided above the hot water supply burner 11 and the bath burner 12, respectively.

A hot water heat exchanger 13 is provided above the hot water combustion chamber 31.
However, a bath heat exchanger (reheating heat exchanger) 14 is arranged above the bath combustion chamber 32, respectively.
A water supply pipe 15 is connected to the inlet side of 13 and a hot water supply pipe 16 is connected to the outlet side of the hot water heat exchanger 13. The bath heat exchanger 14 is interposed in the middle of the forward pipe 18, one end of the forward pipe 18 is connected to the adapter 24 of the bath 39, and the other end is connected to the outlet side of the circulation pump 36. One end of a return pipe 17 having a flowing water switch 33 and a bath temperature detecting thermistor 38 is connected to the suction port side of the circulation pump 36, and the other end of the return pipe 17 is a bathtub 39.
Connected to the adapter 24. Further, the hot water supply pipe 16 and the return pipe 17 are connected by a bypass pipe 25 having a pouring control valve 19 and a water level sensor (pressure sensor) 43 for detecting the bath water level.

Further, the water supply pipe 15 is provided with a flow rate sensor 20 for detecting the flow rate of incoming water and a water quantity adjusting means (water quantity adjusting valve) 21 for variably adjusting the flow rate of incoming water according to the valve opening amount. A hot water supply thermistor 37 for detecting the hot water supply temperature is provided in the middle of the pipe 16, and a hot water supply tap 23 is provided at the outlet side of the hot water supply pipe 16. On the lower side of the hot water supply burner 11 (for example, incorporated in a nozzle header (not shown) that supplies gas to the hot water supply burner 11), an in-appliance temperature sensor 6 for detecting the in-appliance temperature is provided.
Is provided.

This kind of equipment is provided with a control device 40, which normally sets the hot water temperature and
A remote controller 47 for setting the bath temperature, the bath water level, and displaying the set temperature and bath water level is connected.

The control device 40 opens the proportional valve 22 and the water amount adjusting means 21 based on the output signal from the remote controller 47 and the sensor outputs of various sensors such as the flow sensor 20 and the thermistors 37 and 38 according to the sequence program. Quantity control and solenoid valve
35, 49, 50 and open / close control of pouring control valve 19, circulation pump 36
Drive control, etc. to control the operation of appliances such as hot water filling, reheating, hot water supply, and heat retention.

For example, when the hot water supply plug 23 provided at the tip of the hot water supply pipe 16 is opened, water enters from the water supply pipe 15, and when the flow of this water is detected by the flow rate sensor 20, the control device 40 The combustion fan 10 is rotated, the solenoid valves 35 and 50 and the proportional valve 22 are opened, and the igniter electrode 26 is driven to drive the hot water supply burner.
Ignite 11. Then, after confirming that the flame rod electrode 28 has detected the flame, the valve opening drive current of the proportional valve 22 is varied so that the hot water discharge temperature becomes the set temperature, and the gas supply amount (the valve opening amount of the proportional valve 22 is changed. ) Control, rotation control of the combustion fan 10 to supply air corresponding to this gas supply amount, flow rate control of hot water supply by the water amount adjusting means 21, and the like.

When the hot water tap 23 is closed after the hot water is used, the passage of water to the hot water heat exchanger 13 is stopped, and when the stop of the water flow is detected by the signal from the flow rate sensor 20, the electromagnetic The valve 50 is closed, the hot water burner combustion is stopped, then
When the post-purge period in which the exhaust gas in the combustion chamber is almost completely discharged has passed, the rotation of the combustion fan 10 is stopped to prepare for the next hot water discharge.

When pouring water, the pouring control valve 19 is opened, the water is heated by the hot water supply heat exchanger 13 in the same manner as above, the hot water is supplied to the bath side through the bypass pipe 25, and passes through the return pipe 17. When the water level sensor 43 detects the set bath water level, the pouring control valve 19 is closed, the solenoid valves 35 and 50 are closed, and the hot water supply burner 11 is closed. The combustion is stopped and the filling operation is completed.

At the time of reheating, the circulation pump 36 is driven,
The hot and cold water in the bathtub 39 is circulated in the circulation passage that returns from the return pipe 17 to the forward pipe 18 and returns to the bathtub 39 to stir the hot and cold water in the bathtub 39, and when the running water switch 33 detects running water, the combustion fan 10 is turned on. The solenoid valves 35 and 49 and the proportional valve 22 are opened, and the igniter electrode 27 is driven to ignite the bath burner 12. Normally, in the appliance in which the common proportional valve 22 is provided for the bath burner 12 and the hot water supply burner 11 as shown in FIG. 4, when only the bath burner 12 is burned, the burning capacity of the bath burner 12 is preset. Steady set combustion capacity (usually maximum combustion capacity)
When the bath burner 12 and the hot water supply burner 11 are burned together by controlling the opening amount of the proportional valve 22 so that, the combustion operation of the hot water supply burner 11 is prioritized. The opening amount of the proportional valve 22 is controlled according to the combustion capacity to cause the bath burner 12 and the hot water supply burner 11 to burn, and when the set bath temperature is detected by the thermistor 38, the solenoid valve 49 is closed and the bath burner 12 Then, the circulation pump 36 is stopped, and the reheating operation is completed.

After the operation of the reheating operation is completed, the temperature is kept for a predetermined time, for example, 4 hours, and the circulation pump 36 is driven at a predetermined time interval, for example, every 30 minutes to drive the bathtub.
After stirring by circulating the hot water in 39, the thermistor 38 detects the bath water temperature, and when the temperature is lower than the bath set temperature, reheating is performed to maintain the bath bath temperature at the bath set temperature.

In the present specification, the operation of the hot water supply burner 11 to burn the burner is referred to as the operation of the hot water supply function, and the bath burner 12 is used.
A burner burning motion is distinguished as a bath function motion.

Further, as a composite water heater having a hot water supply function and a bath function, as shown in FIG. 5, a hot water supply burner 11 and a bath burner 12 are provided with individual combustion fans 10a and 10b, respectively. There is also. In this way, burner 11,
In the appliances in which the individual combustion fans 10a and 10b are installed in each of the 12 burners, one of the burners is burned and the other burner is stopped in order to prevent the backflow of the exhaust gas. Even at this time, the combustion fan on the burner side during combustion is rotated together with the combustion fan on the burner side during combustion stop to prevent exhaust gas from flowing back into the combustion chamber on the combustion stop side. Note that the instrument configuration of FIG. 5 is the same as the instrument configuration of FIG. 4 described above, so description thereof will be omitted.

In the combined water heater of FIGS. 4 and 5, the hot water supply burner 11 and the bath burner 12 are provided with the common proportional valve 22, but the hot water supply burner 11 and the bath burner 12 are not provided. There is also a combined water heater in which separate proportional valves are provided for and.

[0016]

By the way, the hot water remaining in the hot water supply heat exchanger 13 after the hot water supply plug 23 is closed, that is, after the hot water supply combustion is stopped, as shown by the solid line curve A in FIG. After boiling (a phenomenon in which the amount of heat retained in the hot water supply heat exchanger 13 is transferred to the hot water remaining in the hot water supply heat exchanger 13 to raise the hot water temperature), the hot water temperature (overshoot) higher than the preset hot water temperature Although it becomes hot water, the residual hot water begins to cool as the hot water supply heat exchanger 13 cools, becomes a hot water temperature (undershoot) lower than the set hot water supply temperature after the elapse of the post-boiling time, and then gradually cools down.

From the above, when the hot water is re-fired immediately after the hot water supply is stopped, the hot water overshoots due to the residual hot water. If hot water is again discharged after a long time T minutes (for example, 5 minutes) after the hot water supply combustion is stopped, the residual hot water of the undershoot of the hot water supply heat exchanger 13 is discharged. In this way, after the hot water supply has stopped burning, overshooting or undershooting hot water continues to come out first for a short period of time depending on the time elapsed until hot water comes out again, and then the hot water of the set hot water temperature comes out. There is a problem that the user feels uncomfortable with the fluctuation of the hot water temperature.

Therefore, the applicant of the present invention has proposed (not yet published) a function for stabilizing the temperature of the re-outflow hot water (hereinafter referred to as Q function). For example, the temperature characteristics of the residual hot water in the hot water supply heat exchanger 13 after the hot water supply combustion stop as shown by the solid curve A in FIG. At some times, the amount of startup gas is increased and the Q function is performed in order to more quickly compensate the drop amount Δk of the hot water temperature based on the estimated temperature characteristic.

It has been found from experiments by the present applicants that the proposed Q function system used for the above-mentioned combined water heater has the following points to be improved. For example, in the combined water heater as shown in FIG. 4, when the bath function is activated during the re-hot-standby time and the combustion fan 10 is driven to rotate, ventilation is generated not only in the bath combustion chamber 32 but also in the hot water combustion chamber 31. Due to this ventilation, a cooling acceleration phenomenon occurs in which the cooling of the residual hot water in the hot water supply heat exchanger 13 is promoted, and the temperature characteristic A of the residual hot water in the hot water supply heat exchanger 13 as shown in FIG. 3 may fluctuate. is there.

Further, when the hot water supply burner 11 is large and has a large amount of heat stored therein, when the bath function is activated immediately after the hot water supply combustion is stopped, the heat held by the hot water supply burner 11 is transferred to the hot water supply heat exchanger 13 by the above ventilation. After the residual hot water in the exchanger 13 is heated, a boiling phenomenon occurs and the hot water heat exchanger 13
The temperature characteristic A of the residual hot water in the inside fluctuates. Further, even in the large-scale hot water supply burner 11, when the bath function is activated after a long time has elapsed since the hot water supply combustion was stopped, the above-described cooling promotion phenomenon occurs because the hot water supply burner 11 is cold, and the temperature characteristic A of the residual hot water is still present. May fluctuate.

As described above, in the combined water heater, when the bath function is activated while the hot water is on standby again and the combustion fan 10 is driven to rotate, the solid curve A in FIG. The temperature characteristics of the residual hot water as shown in Fig. 4 fluctuate, and even if the Q function is performed, the hot water with undershoot and overshoot remains when the hot water is left again, and the hot water temperature is given to the hot water user. There is a risk that the fluctuation will give an unpleasant feeling.

Also, in the combined water heater as shown in FIG. 5, as described above, when the bath function is activated during the re-hot-standby state, the backflow of exhaust gas is prevented, so that the combustion fan on the bath side is prevented.
Since not only 10b but also the combustion fan 10a on the hot water supply side must be driven, there is a fear that the user of hot water may feel uncomfortable about the fluctuation of the hot water temperature when the hot water is again discharged.

The present invention has been made to solve the above problems, and an object thereof is to supply hot water with little fluctuation in hot water temperature even when the bath function is activated while waiting for hot water to be left again. The present invention relates to improvement of a compound water heater.

[0024]

In order to achieve the above object, the present invention is constructed as follows. That is, the first invention is a hot water supply burner that heats and burns the hot water heat exchanger, and a bath burner that heats and burns the reheating heat exchanger.
A combined water heater of the type having a common or individual combustion fan for supplying and exhausting the hot water supply burner combustion and the bath burner combustion, and exhaust gas of the hot water supply burner and exhaust gas of the bath burner are discharged from a common exhaust port. When the bath burner is burned during the preset waiting time from the stop of hot water supply combustion to the start of the longest re-leasing hot water, which is preset as the time for stabilization of the temperature of the re-leaving hot water, the combustion capacity of the bath burner is normally operated. It is characterized in that it is provided with a bath capacity lowering controller that lowers the steady set combustion capacity of.

A second aspect of the present invention has the same configuration as the first aspect of the present invention, in which data of a constant reduction amount of the combustion capacity of the bath burner is given in advance, and the bath capacity reduction control unit causes the bath burner to be set during the set waiting time. When the combustion is performed, the combustion capacity of the bath burner is controlled to be reduced by a predetermined reduction amount from the steady set combustion capacity.

A third aspect of the invention has the same structure as the first aspect of the invention, and a hot water temperature estimating unit for estimating the hot water temperature in the hot water heat exchanger with the lapse of time after the hot water supply combustion is stopped, and the hot water supply combustion stop. The bath capacity deterioration control unit has a time measuring unit that measures the elapsed time from the time, and when the bath burner burns during the set standby time, the hot water in the hot water heat exchanger at the start of burning the bath burner It is characterized in that the combustion capacity of the bath burner is continuously or stepwise reduced according to the amount of deviation of the estimated temperature from the hot water supply set temperature.

A fourth aspect of the invention has the same construction as the first or second aspect of the invention, and a hot water temperature estimator for estimating the hot water temperature in the hot water supply heat exchanger with the lapse of time from when hot water supply combustion is stopped. With a time measuring unit that measures the elapsed time from the stop of hot water supply combustion,
When the bath burner burns during the set standby time, the bath capacity deterioration control unit estimates the temperature of the hot water in the hot water supply heat exchanger at the start of combustion of the bath burner to be higher than the hot water set temperature. The combustion capacity of the bath burner is reduced accordingly and the estimated temperature of the hot water in the hot water heat exchanger is lower than the hot water set temperature.In the undershoot condition, the combustion capacity of the bath burner is reduced by a certain amount below the steady set combustion capacity. The feature is that it is configured to uniformly control the reduction.

A fifth aspect of the invention has the same structure as the first aspect of the invention, and is provided with an air flow rate detection unit for detecting the air volume of the common or hot water supply side combustion fan before the hot water supply combustion is stopped, thereby lowering the bath capacity. The control unit is configured such that the combustion capacity of the bath burner is controlled to be lower than the steady set combustion capacity according to the amount of the air flow detected by the air flow detection unit.

A sixth aspect of the invention has the same structure as the first or second or third or fourth or fifth aspect of the invention, in which a release section is set from the end of the set standby time to the front side of the set standby time, and the setting is made. When it is detected that the bath burner is not used within the time from the start of the standby time to the start of the release section, the control operation of the bath capacity deterioration control unit at the time of burning the bath burner during the subsequent hot water supply combustion stop It is characterized in that a capacity lowering control stop portion for stopping is provided.

A seventh aspect of the invention has the same structure as the sixth aspect of the invention, is provided with an instrument temperature sensor for detecting the instrument temperature, and the instrument detected temperature detected by the instrument temperature sensor is preset. When the temperature falls below the given reference temperature in the appliance, a release section setting unit is provided for correcting the time width of the release section continuously or stepwise in accordance with the temperature decrease amount. It is configured.

An eighth aspect of the invention has the same structure as the sixth aspect of the invention, in which the instrument temperature sensor for detecting the instrument temperature and the data of the release section that varies depending on the instrument temperature correspond to the instrument temperature. And a release section setting unit that takes in the detected temperature in the apparatus detected by the temperature sensor in the apparatus and sets a release section corresponding to the detected temperature in the apparatus from the stored data in the memory. Is configured.

In the present invention having the above-mentioned structure, re-hot water is not started until the set waiting time elapses (during the set waiting time) after combustion of the hot water supply burner is stopped (when hot water supply combustion is stopped). When combustion is performed, the bath capacity reduction control unit controls the combustion capacity of the bath burner to be lower than the steady set combustion capacity in normal operation.

As described above, by controlling the decrease of the bath combustion capacity, the combustion fan (when the combustion burner common to the bath burner and the hot water supply burner is provided, the common combustion fan and the bath burner and the hot water supply burner are separately provided. If a combustion fan is installed at the bath burner side,
Residual hot water in the hot water heat exchanger due to air blowing by the common fan rotation drive of the combustion fan on the burner side to reduce exhaust gas backflow It suppresses the cooling acceleration phenomenon of the hot water, and the hot water supply burner is large in size and has a large amount of heat, which suppresses the post boiling increase phenomenon of the residual hot water in the hot water supply heat exchanger due to the blowing by the rotation of the combustion fan immediately after the hot water combustion is stopped. ,
Stabilizes the hot water temperature.

Further, when the bath burner is burned in the bath combustion capacity lowering control state, when the hot spring is started again, the combustion operation of the bath burner returns to the normal operation, and the bath in the lowering control state is restarted. If re-hot water is not started during burner combustion and the elapsed time from hot water supply combustion stop exceeds the set standby time, the residual hot water in the hot water supply heat exchanger will be completely cold and will start cold. It is not necessary to continue the stabilization operation of the hot water temperature, the bath combustion capacity lowering control operation is stopped, and the combustion operation of the bath burner returns to the normal operation operation.

According to the second aspect of the present invention, when the reburning is not started during the set standby time and the combustion of the bath burner is performed, the bath capacity lowering control unit sets the combustion capacity of the bath burner to the steady setting combustion of the normal operation. A certain amount of control is performed to lower the capacity than the capacity, that is, the rotation amount of the combustion fan is controlled to be reduced, and the cooling acceleration phenomenon and post-boiling rise phenomenon of the residual hot water in the hot water supply heat exchanger caused by the blowing of the combustion fan are suppressed. And stabilize the temperature of the hot water.

In the third aspect of the invention, when the combustion of the hot water supply burner is stopped, the time measuring unit measures the elapsed time from the stop of the hot water supply combustion, and the re-releasing hot water is not started during the set waiting time, and the combustion of the bath burner is stopped. When it is started (when the bath operation is started), the hot water temperature estimation unit estimates and detects the hot water temperature of the hot water in the hot water supply heat exchanger at the time of the start of the bath operation. The bath capacity deterioration control unit
Depending on the amount of deviation of the estimated hot water temperature in the hot water supply heat exchanger with respect to the hot water supply set temperature, the combustion capacity of the bath burner is controlled to decrease continuously or in steps below the steady set combustion capacity, and Stabilize.

In the fourth invention, when the hot water temperature in the hot water supply heat exchanger at the start of the bath operation is estimated and detected in the same manner as in the third invention, the bath capacity lowering control unit is set to the hot water supply set temperature. When the estimated hot water temperature in the hot water supply heat exchanger deviates in the high direction, the combustion capacity of the bath burner is reduced according to the magnitude of this overshoot, and the estimated hot water temperature in the hot water heat exchanger is set relative to the set hot water temperature. When the temperature is deviating to the lower direction (in the undershoot condition), the combustion capacity of the bath burner is controlled to be reduced by a certain amount to stabilize the temperature of the re-outflow hot water.

In the fifth aspect of the present invention, when the combustion of the hot water supply burner is stopped, the air flow rate detection unit is driven by a common combustion fan when the hot water supply burner and the bath burner are provided with a common combustion fan. Detects the amount of air blown before hot water supply combustion is stopped, or detects the amount of air blown before hot water supply burned by driving the combustion fan on the hot water supply burner side if the hot water supply burner and the bath burner have separate combustion fans To do. When re-hot water is not started during the set waiting time and the combustion of the bath burner is started, the bath capacity deterioration control unit determines the combustion capacity of the bath burner according to the detected amount of air blow before the stop of hot water combustion. Is controlled to be lower than the steady set combustion capacity, and the temperature of the re-outflow hot water is stabilized.

Further, in the sixth aspect of the invention, when it is detected that the bath burner is not used within the time from the stop of hot water supply combustion to the start of the release section, the combustion fan starts rotational driving in the release section. Even if the cooling of the hot water in the hot water supply heat exchanger is promoted to a small degree even by the ventilation, it is not necessary to control the decrease of the bath combustion capacity as in each of the above inventions, and the capacity deterioration control stop part reduces the bath capacity. The control operation of the control unit is stopped.

In the seventh invention, the temperature sensor in the instrument detects the temperature in the instrument, and when the detected temperature in the instrument is lower than the reference temperature in the instrument, the release section setting unit sets the reference temperature in the instrument to the reference temperature in the instrument. The time width of the release section is corrected to be shortened continuously or stepwise according to the amount of decrease in the temperature detected in the device. As in the sixth aspect of the invention, the bath burner may not be used within the time from the stop of hot water combustion to the start of the corrected canceling section (uncorrected canceling section when no correction is made). When it is detected, the capacity deterioration control stop unit stops the control operation of the bath capacity deterioration control unit.

In the eighth aspect of the present invention, the instrument temperature sensor detects the instrument temperature, the release section setting unit takes in the instrument detected temperature, and compares the instrument detected temperature with the data of the release section of the memory. For example, the release section corresponding to the in-apparatus detected temperature is detected and updated for each sampling of the in-apparatus temperature. Then, as in the sixth aspect of the invention, when it is detected that the bath burner is not used within the time from the stop of hot water supply combustion to the start of the setting release section, the capacity lowering control stop unit controls the bath capacity lowering. The control operation of the section is stopped.

[0042]

Embodiments of the present invention will be described below with reference to the drawings. The combined water heater of each embodiment described below is intended for the combined water heater shown in FIGS. 4 and 5, and the description of FIGS. 4 and 5 is omitted because it has been described in the conventional example. . FIG. 1 shows a configuration of a re-spout hot water temperature stabilizing means (control device) which is characteristic of each embodiment described below.
40) is shown, and the bath capacity lowering control unit 1, the hot water temperature estimating unit 2, and the time measuring unit 3 are shown in the first embodiment.
The capacity lowering control stop unit 5, the memory 8, the hot water supply combustion control unit 46, and the bath combustion control unit 48 are included.

The bath combustion control unit 48 has a structure for performing the control operation of the reheating and the heat retention operation described above in the conventional example. For example, when the reheating is commanded by the remote controller 47, the circulation pump 36 is operated as described above. The hot water in the bathtub 39 is circulated in the circulation passage returning from the return pipe 17 to the bathtub 39 through the outward pipe 18 to stir the hot water in the bathtub 39, and when running water is detected by the running water switch 33, The combustion fan 10 is rotated and the solenoid valve 35,
49 and the proportional valve 22 are opened, and the igniter electrode 27 is driven to ignite the bath burner 12. Then, when the set bath temperature is detected by the thermistor 38, the solenoid valve 49 is closed to stop the combustion of the bath burner 12 and the circulation pump 36 is stopped.

The hot water supply combustion control unit 46 has a structure for performing the control operation in the hot water supply and hot water filling operations described above in the conventional example. For example, when the flow rate sensor 20 detects flowing water, the solenoid valves 35 and 50 are opened, the combustion fan 10 (10a, 10b) is rotationally driven, the igniter electrode 26 is driven, and the hot water supply burner 11 is ignited. Combustion is started, and after the feedforward calculation so that the incoming water temperature becomes the set hot water supply temperature, proportional calculation is performed so that the outgoing hot water temperature becomes the set hot water supply temperature, and the valve opening amount of the proportional valve 22 is variably controlled. When the flow sensor 20 detects the stoppage of running water, the solenoid valve 50 is closed to stop the combustion of the hot water supply burner 11.
Further, when the proposed Q function is performed, the Q function is performed by the valve opening amount correction control of the proportional valve 22 at the start of re-melting, or by other appropriate means.

Further, in the present embodiment, the hot water supply combustion control section 46 outputs a hot water supply combustion stop signal to the time measuring section 3 and the hot water temperature estimating section 2 when the flow sensor 20 detects the stop of running water,
When the flow rate sensor 20 detects running water, the hot water supply combustion start signal is output to the time measuring unit 3 and the hot water temperature estimating unit 2.

The time measuring unit 3 has a timer (hereinafter referred to as Q timer). When the hot water supply combustion stop signal from the hot water supply combustion control unit 46 is received, the hot water supply combustion is stopped and the hot water supply waiting state is resumed. Then, the Q timer is driven to start measuring the elapsed time T _Q from the hot water supply combustion stop, and at the same time, the re-hot water standby start signal is output to the bath capacity deterioration control unit 1 and the capacity deterioration control stop unit 5. Further, when the hot water supply combustion start signal of the hot water supply combustion control unit 46 is received, it is determined that the hot water supply combustion is started and the re-hot spring is started, the Q timer is stopped, and the re-hot water start signal is output to the capacity lowering control stop unit 5. , Q timer is reset to prepare for the next timer drive.

The hot water temperature estimating unit 2 has a built-in memory, and samples the hot water supply and combustion capability of the hot water supply burner 11 from the hot water supply combustion control unit 46 during hot water supply combustion and stores it in the built-in memory.
Further, in the memory of the hot water temperature estimating unit 2, the post-boiling peak temperature as shown in FIG. 3 is calculated based on the hot water supply combustion ability before the hot water supply combustion is stopped or in consideration of other hot water temperature estimation conditions such as the outside air temperature. Calculation formula for calculating K _P , calculation formula for calculating post-boiling peak time T _P from when hot water supply combustion is stopped to after-boiling peak, post-boiling peak temperature K _P and its time T _P Or in consideration of other hot water temperature estimation conditions such as the outside air temperature, the hot water temperature characteristic data of the residual hot water of the hot water heat exchanger 13 after the hot water supply combustion is stopped as shown by the solid curve A in the figure ( An arithmetic expression for creating the relational data between the elapsed time T _Q after the hot water supply combustion stop and the residual hot water temperature is obtained by experiments or the like.

When the hot water temperature estimation unit 2 receives the hot water supply combustion stop signal from the hot water supply combustion control unit 46, the combustion capacity and the post-boiling peak temperature calculation formula and the post-boiling peak time calculation calculation in the internal memory immediately before the hot water combustion stop are performed. The post-boiling peak temperature K _P and the post-boiling peak time T _P are obtained based on the formulas, and the residual hot water temperature characteristic data is calculated and stored based on the K _P and T _P and the calculation formula for generating the residual hot water temperature characteristic data. .

Further, when the hot water temperature estimation unit 2 receives the hot water supply combustion start signal from the hot water supply combustion control unit 46, the hot water temperature combustion capability of the built-in memory is adjusted to prepare for the preparation of the residual hot water temperature characteristic data when the next hot water supply combustion is stopped. The sampling value and the residual hot water temperature characteristic data are cleared, and the hot water supply and combustion ability is sampled as described above.

The memory 8 has a set waiting time T _R (for example, 510 seconds) as a stabilization time of the re-exposed hot water temperature, and a release section T _S provided on the front side from the end of the set waiting time T _R.
(For example, 150 seconds), the bath burning ability correction data is given in advance. The bath combustion capacity correction data is calculated based on the deviation amount (fluctuation amount) in which the estimated hot water temperature (remaining hot water temperature) of the hot water heat exchanger 13 at the start of hot bath heating while hot water heating is stopped deviates from the set hot water temperature. This is the data for the bath combustion capacity correction amount that corrects the deterioration of the combustion capacity, and this data is table data given continuously or stepwise to the deviation amount of the hot water temperature of the residual hot water obtained by experiments and calculations. And graph data, and may be arithmetic expression data for calculating the bath combustion ability correction amount based on the deviation amount of the hot water temperature of the residual hot water, and either of them may be used.

When the bath capacity lowering control unit 1 receives the re-hot-standby standby start signal from the time measuring unit 3 indicating that the hot water supply combustion has stopped, the bath capacity lowering control unit 1 enters the capacity lowering control standby state. In this state, the bath rod burner 12 side frame rod When the electrode 29 detects a flame,
When the combustion of the bath burner 12 is judged to have been performed, the following capacity deterioration control operation is started.

Even when the combustion of the bath burner 12 is continued before the hot water supply combustion is stopped and after the hot water supply combustion is stopped, the following capacity lowering control operation is started when the hot water supply combustion is stopped.

When the burning of the bath burner 12 is detected, the bath capacity lowering control unit 1 detects from the time measuring unit 3 a bath control standby time T _H from when hot water supply combustion is stopped to when the bath operation is started. The control standby time T _H is collated with the residual hot water temperature characteristic data created and stored by the hot water temperature estimating unit 2 to estimate and detect the hot water temperature of the hot water supply heat exchanger 13 (the hot water temperature of the residual hot water) at the start of the bath operation. . Then, the bath capability lowering control unit 1 takes in the set hot water supply temperature set by the remote controller 47, subtracts the hot water temperature of the residual hot water from the set hot water supply temperature, and calculates the variation amount ΔU of the hot water temperature of the residual hot water with respect to the set hot water supply temperature. .

This fluctuation amount ΔU represents the magnitude (deviation amount) of the deviation of the hot water temperature of the residual hot water from the set hot water supply temperature, and
The sign of the sign indicates the shift direction. In the present embodiment, when the fluctuation amount ΔU is positive, the hot water temperature of the residual hot water deviates toward the lower direction with respect to the set hot water supply temperature, and when the fluctuation amount ΔU is negative, the residual hot water temperature is higher than the set hot water supply temperature. It shows that the hot water temperature is shifted to a higher direction.

The bath capacity lowering control unit 1 calculates the variation amount ΔU of the residual hot water as described above, and then calculates the variation amount ΔU in the memory 8
The bath combustion capacity correction data is compared to detect the bath combustion capacity correction amount corresponding to the variation amount ΔU in order to control the decrease in the bath combustion capacity, and outputs it to the bath combustion control unit 48, based on the bath combustion capacity correction amount. The bath combustion control unit 48 is caused to control the decrease of the bath combustion ability.

The bath burning capacity correction amount is used to continuously or stepwise reduce the steady set bath burning capacity in normal operation according to the deviation amount of the residual hot water indicated by the variation amount ΔU of the residual hot water. When the combustion control unit 48 receives the signal for the bath combustion capacity correction amount, the combustion control unit 48 adjusts the valve opening amount of the proportional valve 22 by the valve opening drive current corresponding to the correction amount to reduce the bath combustion capacity, and to decrease the bath combustion capacity. A combustion fan (in FIG. 4, the combustion fan 10 common to the bath burner 12 and the hot water supply burner 11, and in FIG. 5 the bath burner 12 side so that the amount of air commensurate with the combustion of the controlled bath combustion capacity is supplied to the bath burner 12 In order to prevent the reverse flow of the combustion fan 10b and the exhaust gas, the fan rotation amount of the combustion fan 10a) on the hot water supply burner 11 side is controlled to be reduced.

As described above, when the bath operation is performed within the set waiting time while the hot water supply combustion is stopped, the bath combustion capacity is controlled to be reduced and the fan rotation amount of the combustion fan is controlled to be reduced. It is possible to suppress the residual hot water cooling acceleration phenomenon and the post-boiling rise phenomenon due to the rotational drive,
Stabilization of hot water temperature.

When the start / stop of the combustion of the bath burner 12 is repeated many times between the time when the hot water supply combustion is stopped and the time when the hot water is restarted or the set waiting time is reached, the above-mentioned capacity is lowered each time the combustion of the bath burner 12 is started. Take control action.

When the capacity lowering control stop unit 5 receives the re-hot-standby standby start signal of the time measuring unit 3 indicating the stop of hot water supply combustion, the time measured by the Q timer of the time measuring unit 3 (elapsed from the time when hot water supply combustion is stopped) Time) start sampling T _Q ,
Also, from the memory 8, the set waiting time T _R (for example, 510
Seconds) and cancellation section T _S (for example 150 seconds),
The capacity deterioration control standby time (for example, 360 seconds) is calculated by subtracting T _S from the T _R.

The capacity lowering control stop unit 5 causes the frame rod electrode 29 of the bath burner 12 to operate until the elapsed time T _Q from the hot water supply combustion stop exceeds the capacity lowering control standby time indicating that it has entered the release section. When it is detected that the combustion of the bath burner 12 is not performed without detecting the flame, the combustion of the bath burner 12 is started in the release section and the combustion fan is started.
Even if 10 (10a) is rotationally driven, the degree of the cooling promotion phenomenon due to the rotational driving of the combustion fan is small, and it is possible to stabilize the re-outflow hot water temperature without controlling the decrease of the bath combustion capacity. A judgment signal is output to the bath capacity deterioration control unit 1 to release the capacity deterioration control standby state. In the bath capacity lowering control unit 1, the capacity lowering control standby state is released in response to the release signal, and the capacity lowering control operation is not performed even after the frame rod electrode 29 detects the start of combustion of the bath burner 12. .

Further, the capacity lowering control stop unit 5 stops the hot water supply combustion without restarting the hot water supply while the decrease control of the bath combustion capacity is started and continued before the release section during the hot water supply combustion stop. When the elapsed time T _Q from the time exceeds the set waiting time T _R , which is the time for stabilizing the temperature of the re-outflow hot water, the residual hot water in the hot water supply heat exchanger 13 has completely cooled and becomes a cold start. It is determined that it is not necessary to continue the stabilization operation of the re-outflow hot water temperature by the decrease control of the bath temperature decrease control unit
Output to

Upon receiving the above stop signal, the bath capacity lowering control unit 1 outputs a lowering control stop signal to the bath combustion control unit 48, terminates the bath combustion capacity lowering control operation in the bath combustion control unit 48, and performs the normal operation. Return to operation.

Further, when the capacity lowering control stop unit 5 receives the re-hot water start signal indicating the start of hot water supply combustion from the time measuring unit 3, the bath capacity lowering control unit 1 outputs a stop signal for stopping the lowering control.
The bath capacity lowering control unit 1 cancels the capacity lowering control standby state when it is in a standby state, and outputs a lowering control stop signal when the bath combustion capacity correction amount is output (during capacity lowering control). The control signal is output to the control unit 48, and the bath combustion ability lowering control operation in the bath combustion control unit 48 is terminated, and the normal operation operation is restored.

Next, an example of the operation of the re-discharging hot water temperature stabilizing means having the above structure will be briefly described with reference to the flowchart of FIG. First, in step 101, when the combustion stop of the hot water supply burner 11 is detected, in step 102, the time measuring unit 3
The Q timer is driven to start measuring the elapsed time T _Q from the time when hot water supply combustion is stopped, and at the same time, the bath capacity lowering control unit 1 is brought into the lowering control standby state. Bath burner in step 103
When it is determined that the combustion of the bath burner 12 has started, in step 104,
The bath burning ability is controlled to be lowered by the bath ability lowering control unit 1 to stabilize the temperature of the re-outflow hot water.

In step 105, it is judged whether or not re-hot spring is started. When it is judged that the red hot water is started, in step 106, the bath capacity lowering control operation of the bath combustion control unit 48 is stopped and the normal operation is restarted. Return to.

If it is determined in step 105 that re-hot-water discharge has not started, then in step 108,
The elapsed time T _Q from the hot water supply combustion stop is the set waiting time T _R
(For example, 510 seconds) Judgment is made. T _Q
If it is determined that is above T _R , the above step
Proceeds to 106, determines that there is no need to continue to stabilize the re-pouring hot water temperature according to a bath capacity reduction control, to terminate the reduction control operation bath capacity, returns to normal operation, the opposite, T _Q is T _R
If it is determined that the value does not exceed the limit,
The lowering control operation of the bath combustion capacity in the above is continuously performed.

In the step 103, the bath burner 12
When it is determined that the combustion of No. 1 has not started, it is determined in step 107 whether re-hot water has started. If it is judged that the re-hot water has started, in step 110,
Even if the combustion of the bath burner 12 is started after releasing the deterioration control standby state of the bath capacity deterioration control unit 1, the deterioration control of the bath combustion capacity is not performed.

When it is judged at step 107 that re-hot water has not been started, at step 109, the elapsed time T _Q from the stop of hot water supply combustion is the set waiting time T _R (for example, 510 seconds) and the release section T. Judge whether or not it has exceeded the capacity deterioration control standby time (360 seconds) after subtracting _S (for example, 150 seconds). When it is determined that T _Q exceeds T _R −T _S , in step 110, even if the combustion of the bath burner 12 is started thereafter, the effect of the cooling promotion phenomenon due to the rotational drive of the combustion fan is small, and the bath It is determined that stabilization of the re-outflow hot water temperature can be achieved without performing the combustion capacity reduction control, and the bath capacity reduction control unit 1 is released from the reduction control standby state. On the contrary, when it is determined that T _Q does not exceed T _R -T _S , the operations after step 103 are performed.

According to the present embodiment, when the combustion of the bath burner 12 is performed before the start of the release section during the hot water supply combustion stop, the bath combustion capacity is controlled to be lowered, so the bath burner during the hot water supply combustion stop is performed. The fan rotation amount of the combustion fan in the combustion operation of 12 is reduced by the amount of decrease in the combustion ability, and it is possible to suppress the phenomenon of promoting cooling of the residual hot water in the hot water supply heat exchanger 13 and the post-boiling rising phenomenon caused by the fan rotation drive. Even if the bath burner 12 is burned while the hot water supply is stopped, it is possible to suppress fluctuations in hot water temperature such as undershoot or overshoot hot water that is discharged when hot water is again discharged. Therefore, the user of the hot water does not undergo a sudden change in the hot water temperature at the time of starting the re-hot water, and can use the hot water comfortably.

In the present embodiment, when the bath burner 12 is burned before the release section during the hot water supply combustion stop, the residual hot water of the hot water supply heat exchanger 13 with respect to the hot water supply set temperature at the start of the bath operation is set. The bath combustion capacity was controlled to be reduced according to the deviation amount (fluctuation amount) of the hot water temperature of the hot water. For example, control to the lower limit capacity for bath combustion)
However, along with that, the fan rotation amount of the combustion fan may be controlled to be reduced to suppress the cooling acceleration phenomenon and the post-boiling rising phenomenon due to the fan rotation drive, and stabilize the re-outflow hot water temperature. In this case, the memory 8 is provided with the only bath combustion capacity correction amount previously obtained by experiments, calculations, etc. as the bath combustion capacity correction data.

When the hot water temperature of the residual hot water in the hot water supply heat exchanger 13 at the start of the bath operation is higher than the hot water supply set temperature, that is, when the hot water temperature of the residual hot water calculated by the bath capacity lowering control unit 1 is When the fluctuation amount ΔU is negative, the bath combustion capacity is controlled to be reduced according to the amount of deviation of the overshoot, and when the hot water temperature of the residual hot water at the start of bath operation is lower than the hot water supply set temperature, that is, When the variation amount ΔU of the hot water temperature of the residual hot water is positive, the bath combustion capacity may be uniformly reduced and controlled by a fixed reduction amount.

In this case, the bath combustion capacity correction data in the memory 8 shows that the fluctuation amount ΔU when the fluctuation amount ΔU is negative.
The bath combustion capacity correction amount is continuously or stepwise given according to the magnitude of the fluctuation amount, and when the fluctuation amount ΔU is positive, the fluctuation amount Δ
A fixed amount of bath combustion capacity correction is given regardless of the size of U.

Further, in the case of an overshoot in which the hot water temperature of the residual hot water in the hot water supply heat exchanger 13 at the start of the bath operation is higher than the hot water supply set temperature, the bath combustion capacity is uniformly controlled to be decreased by a fixed amount, and the residual hot water is controlled. In the case of an undershoot in which the hot water temperature is lower than the hot water supply set temperature, the bath combustion capacity may be controlled to be reduced according to the amount of deviation of the undershoot.

As described above, various methods can be used to control the decrease in the bath combustion capacity while the hot water supply is stopped, but the most effective way to stabilize the re-outflow hot water temperature is to:
As described above, regardless of the deviation of the hot water temperature of the residual hot water, the bath burning capacity may be uniformly controlled to fall to the bath burning lower limit capacity. However, due to the decrease in the bath combustion capacity, it takes time for the bath to boil and the usability deteriorates, and the dew point temperature rises due to a decrease in the amount of ventilation in the bath combustion chamber, causing the bath burner to burn while the bath burner is burning. Dew condensation occurs on the heat exchanger, which accelerates the deterioration of the bath heat exchanger and deteriorates the durability of the equipment.

Therefore, for example, as described above, by controlling the bath combustion capacity to a combustion capacity that is smaller than the steady set combustion capacity of normal operation and larger than the bath combustible lower limit capacity in accordance with the amount of deviation of the hot water temperature, re-hot-water discharge is performed. While effectively stabilizing the hot water temperature, it is possible to alleviate the problems caused by the above-described reduction control.

The second embodiment will be described below with reference to FIG. The most characteristic feature of the present embodiment is that an air flow rate detection unit 4 is provided instead of the hot water temperature estimation unit 2 in the first embodiment, and hot water supply detected by the air flow rate detection unit 4 is performed. This is to control the decrease of the bath combustion capacity according to the amount of air blown by the rotation drive of the combustion fan before the combustion is stopped.

By the way, when the appliance supplies hot water to the shower in the bathroom, the user of the hot water often receives the hot water on the body parts such as the head and chest that are particularly sensitive to the fluctuation of the hot water temperature. When the hot water temperature fluctuates significantly when the hot water is re-used while in use, the user of the hot water feels the hot water temperature fluctuation sensitively and feels very uncomfortable. Therefore, the inventor of the present invention uses the hot water supply and combustion ability that is variable according to the purpose of using hot water, that is, the amount of air blown by the combustion fan, such as when using hot water in the shower or in the kitchen (for washing dishes, for example). The equipment for estimating the intended use of hot water, controlling the decrease in bath burning ability while hot water supply is stopped, and stabilizing the temperature of hot water coming out again by the second implementation of the size according to the intended use of hot water It is provided in the form example.

In the description of the second embodiment, the configuration other than the bath capacity lowering controller 1 and the memory 8 in the first embodiment is the same as that of the first embodiment. The duplicated description will be omitted.

The blown air amount detection unit 4 has a built-in memory, and when hot water supply combustion is started and the hot water supply combustion control unit 46 outputs a hot water supply combustion start signal, the hot water supply burner 11 and the bath burner 12 are provided with the common combustion fan 10. If there are 10 common combustion fans
Fan rotation detection sensor 45, hot water supply burner 11 and bath burner
When the combustion fans 10a and 10b separate from 12 are provided, sampling of the fan rotation speed of the combustion fan 10 (10a) detected by the fan rotation detection sensor 45a of the combustion fan 10a on the hot water supply burner 11 side is started. And sequentially store it in the built-in memory.

Further, the hot water supply combustion is stopped and the hot water supply combustion control section
When 46 outputs the hot water supply combustion stop signal, the air flow rate detection unit 4 detects the fan rotation speed immediately before the hot water supply combustion stop as the air flow rate of the combustion fan before the hot water supply combustion stop, and the fan rotations stored in other internal memories. Clear the sampling value of the number.

The purpose of use of the hot water can be estimated from the detected air flow rate before the hot water supply combustion is stopped. For example, when the amount of air blown before the hot water supply combustion is stopped is large, that is, when the ability to burn hot water is large, it can be estimated that hot water is used in the shower and continues to be used in the shower even when hot water is discharged again. It can be presumed that when it is small, that is, when the hot water supply and combustion ability is small, the hot water is used in a place other than the shower in the kitchen or the like and is continuously used at that place even when the hot water is discharged again.

The memory 8 is provided with the set waiting time T _R (for example, 510 seconds) and the release section T _S (for example, 150 seconds) as in the first embodiment. Also, as the bath combustion capacity correction data for controlling the decrease of the bath combustion capacity, the data of the bath combustion capacity correction amount (table data or graph data) that continuously or stepwise correspond to the size of the blown air volume.
Is previously obtained and given by experiments and calculations. Alternatively, calculation formula data for calculating the bath combustion capacity correction amount based on the magnitude of the blown air amount is given.

As in the case of the first embodiment, the bath capacity lowering control unit 1 enters the capacity lowering control standby state when it receives the re-hot-standby standby start signal of the time measuring unit 3 indicating the hot water supply combustion stop.
In this state, when the flame rod electrode 29 on the side of the bath burner 12 detects a flame, it is determined that the bath burner 12 has burned, and the following capacity lowering control operation is started.

When the combustion of the bath burner 12 is detected, the bath capacity deterioration control unit 1 takes in the air flow amount before the hot water supply combustion stop detected by the air flow amount detection unit 4, and stores the air flow amount in the memory 8. The bath combustion capacity correction data is collated to detect the bath combustion capacity correction amount corresponding to the size of the blown air, and the detected bath combustion capacity correction amount signal is output to the bath combustion control unit 48. In the bath combustion control unit 48, as in the first embodiment, the bath combustion capacity is controlled to be lower than the steady set combustion capacity by the bath combustion capacity correction amount, and the bath combustion capacity is controlled to be reduced. In addition, the fan rotation speed of the combustion fan is controlled to be reduced to suppress the residual hot water cooling acceleration phenomenon and the post-boiling rise phenomenon caused by the rotational driving of the combustion fan.

According to the second embodiment, the bath combustion capacity when burning the bath burner 12 during the hot water supply combustion stop is controlled in accordance with the amount of air blown by the combustion fan before the hot water supply combustion stop. As a result, excellent effects can be obtained as in the first embodiment.

When it is estimated that hot water is being used in the shower based on the amount of air blown before hot water supply combustion is stopped, the amount of decrease in bath combustion capacity during hot water supply combustion is set to be larger than when it is used in the kitchen or the like. Since the fan rotation amount of the combustion fan, that is, the blown air amount, is reduced, the cooling acceleration phenomenon and the post-boiling rise phenomenon caused by the fan rotation drive are further suppressed, and there is less fluctuation in hot water temperature when using the shower than when using it in the kitchen, etc. Since the hot water is supplied and the user of the hot water receives the hot water with less fluctuation of the hot water temperature when using the shower, the hot water can be comfortably used even if the hot water is received by the body part sensitive to the hot water temperature fluctuation.

Furthermore, when the combustion of the bath burner 12 is started after the hot water supply combustion is stopped, it is possible to detect the correction amount for suppressing the decrease of the bath combustion ability before the combustion of the bath burner 12 is started. The decrease control of the bath combustion capacity can be promptly performed by the amount that the correction amount detection operation is not performed at the start.

The third embodiment will be described below with reference to FIG. The most distinctive feature of the present embodiment example from the first or second embodiment example is that a release section setting unit 7 is provided. In the description of the present embodiment, the configuration other than the capacity deterioration control stopping unit 5 and the memory 8 in the first or second embodiment is the first.
Alternatively, since the configuration is the same as that of the second embodiment, duplicate description thereof will be omitted.

As described above, the memory 8 stores the set waiting time T _R (for example, 510 seconds) and the release section T _S (for example, 150 seconds).
Second), the bath burning ability correction data is given in advance,
Further, in the present embodiment, the in-appliance reference temperature and the release section correction data are obtained in advance by experiments, calculations and the like. The release section correction data is data of a correction section for correcting the release section in a direction of shortening the release section as the amount of decrease in the in-apparatus temperature with respect to the reference temperature in the apparatus increases. It is given as table data or graph data corresponding to the amount of decrease in the temperature inside the appliance continuously or stepwise, or as arithmetic expression data.

When the hot water supply combustion is stopped and the hot water supply combustion control unit 46 outputs the hot water supply combustion stop signal, the release section setting unit 7 starts taking in the temperature inside the detected device by the temperature sensor inside the device 6, and the temperature inside the detected device is detected. And the reference temperature in the instrument of the memory 8 are compared, and when the temperature in the detection instrument is lower than the reference temperature in the instrument, the temperature in the detection instrument is subtracted from the reference temperature in the instrument to decrease the temperature in the detection instrument to the reference temperature in the instrument. Calculate the amount.

The release section T _S is set on the assumption that the temperature inside the device is equal to or higher than the reference temperature inside the device, and when the temperature inside the device is lower than the reference temperature inside the device,
A cooling acceleration phenomenon caused by the rotational driving of the combustion fan appears largely by the amount of the decrease. In order to suppress the large cooling acceleration phenomenon, it is necessary to correct the release section T _S by the amount corresponding to the decrease in the in-appliance temperature with respect to the in-appliance reference temperature.

Therefore, when the detected instrument internal temperature is lower than the in-appliance reference temperature and the amount of drop is calculated, the canceling section setting unit 7 shortens the canceling section according to the magnitude of the drop, as described above. It is determined that it is necessary to perform the above, the calculated fall amount is collated with the release section correction data of the memory 8, the correction section corresponding to the calculated fall amount is detected, and the release section T _S of the memory 8 is read out and the release section T _S Is corrected by a correction section, and the correction cancellation section T _SS is output to the capacity deterioration control stop unit 5.

Note that the above-mentioned temperature inside the instrument 6 taken in by the instrument temperature sensor 6 and the operation of comparing the temperature inside the instrument detected with the reference temperature inside the instrument are performed in the correction cancellation section T _SS (correction is performed from the start of hot water combustion stop). When not released, it is repeatedly performed until the start of the release section T _S ), and as a result of the comparison between the detection instrument internal temperature and the instrument internal reference temperature, when the detection instrument internal temperature is lower than the instrument internal reference temperature, The correction cancellation section is detected and continued.

[0094] The capacity reduction control stopping unit 5 receives the correction cancellation section T _SS release segment setting section 7 (e.g., 140 seconds), correction cancellation section T _SS from the setting waiting time T _R (e.g. 510 seconds)
By subtracting the correction capability reduction control standby time (for example, 370
Second), and the previously calculated capacity deterioration control standby time (for example, 360 seconds) is corrected to the corrected capacity deterioration control standby time (370 seconds).
Sec) and change the standby time for capacity deterioration control.

The capacity lowering control stop unit 5 samples the measurement time of the time measuring unit 3 as in the first or second embodiment, and the elapsed time T _Q from the hot water supply combustion stop is the capacity lowering control standby. When the time is exceeded, the canceling section correcting operation of the canceling section setting unit 7 is ended.

According to the third embodiment, even if the cooling promotion phenomenon appears larger than the assumed one because the temperature inside the equipment is lower than the reference temperature inside the equipment, the inside temperature of the equipment relative to the reference temperature inside the equipment is increased. Since the release interval is shortened and corrected according to the amount of temperature drop, it is possible to remove the influence time portion where the cooling promotion phenomenon is larger than expected from the release interval, and even if there is a large drop in the temperature inside the device In addition, it is possible to stabilize the hot water temperature.

A fourth embodiment will be described below with reference to FIG. The present embodiment is different from the first or second embodiment in that the release section is not fixed in advance, but the release section setting unit 7 changes according to the in-apparatus temperature. That is, the cancellation section is set by itself. Since the configuration other than the capacity deterioration control stopping unit 5 and the memory 8 in the first or second embodiment is the same as that in the first or second embodiment, duplicated description thereof will be omitted. .

As in the first or second embodiment, the memory 8 is preliminarily provided with the preset standby time T _R and the bath combustion capacity correction data. The data of the release section in which the release section becomes shorter as is decreased is given as table data or graph data that is obtained by experiments, calculations, or the like and is continuously or stepwise corresponded to the in-apparatus temperature, or as calculation formula data.

When the hot water supply combustion is stopped and the hot water supply combustion control unit 46 outputs the hot water supply combustion stop signal, the canceling section setting unit 7 starts sampling the in-device temperature detected by the in-device temperature sensor 6, and determines the in-device temperature. The sampling value of is collated with the cancellation section data of the memory 8, the cancellation section corresponding to the sampling value is detected and set, and is output to the capability deterioration control stopping unit 5. Note that the release section is detected and updated and set every time the temperature inside the appliance is sampled.

Upon receiving the release section detected and set by the release section setting section 7, the capacity reduction control stopping section 5 subtracts the release section from the set standby time T _R to calculate the capacity reduction control standby time, and calculates the capacity When the decrease control standby time is calculated, the previous capacity decrease control standby time is replaced with the newly calculated capacity decrease control standby time, and the capacity decrease control standby time is changed.

Further, the capacity lowering control stop unit 5 samples the measurement time of the time measuring unit 3 as in the first or second embodiment, and the elapsed time T _Q from the hot water supply combustion stop is detected. When the capacity lowering control standby time indicating that the vehicle has entered the cancellation section is exceeded, it is determined that the cancellation section need not be set, and a signal for ending the cancellation section setting is output to the cancellation section setting unit 7 to cancel the cancellation. Terminate the section setting operation.

The configuration of the capacity lowering control stopping unit 5 other than the above is the same as that of the first or second embodiment, and therefore its explanation is omitted.

According to the fourth embodiment, since the release section is set in accordance with the temperature inside the appliance, the same excellent effect as that of the third embodiment can be obtained.

The present invention is not limited to the above-described embodiments, but can take various modes.
For example, in each of the above-described embodiments, the hot water supply combustion control unit 46 determines that the hot water supply combustion has stopped or started when the flow sensor 20 detects running water stop / start of running water, and the hot water supply combustion stop signal or hot water supply combustion Although the signal indicating the start was output, the start / stop signal of the hot water supply combustion is output by other sensor output information such as the frame rod electrode 28 and the open / close signal of the solenoid valve 50 in the gas supply passage of the hot water supply burner 11. A determination may be made and a signal indicating the start / stop of hot water supply combustion may be output as described above.

Further, the hot water temperature estimating unit 2 in the first embodiment described above calculates and creates the temperature characteristic data of the residual hot water of the hot water heat exchanger after the hot water combustion is stopped. Experimental data previously obtained by experiments or the like in accordance with various parameter conditions such as temperature may be given as temperature characteristic data of the residual hot water.

Further, in each of the above embodiments, the hot water temperature estimating unit 2 and the time measuring unit 3 are provided to estimate and detect the hot water temperature of the residual hot water in the hot water heat exchanger after the hot water supply combustion is stopped.
A temperature sensor for actually measuring the residual hot water temperature in the hot water supply heat exchanger may be provided and the residual hot water temperature in the hot water supply heat exchanger may be actually measured using the temperature sensor. In this case, the hot water temperature estimating unit 2 and the time measuring unit 3 may be omitted, and the configuration of the control circuit can be simplified.

Further, the air flow rate detecting unit 4 in the second embodiment described above indirectly detects the air flow rate by sampling the fan rotation speed of the combustion fan from the fan rotation detection sensor, but the combustion air flow rate is detected indirectly. The air flow rate may be estimated and detected based on the rotation drive current value of. Alternatively, in an instrument provided with an air flow sensor, the air flow rate of the combustion fan may be directly detected based on the sensor output of the air flow sensor. Based on the detected air flow rate, it is possible to estimate the purpose of using the hot water as in the second embodiment.

Furthermore, in the second embodiment, the purpose of use of the hot water supplied by the hot water supply is estimated based on the amount of air blown by the combustion fan, and the bath combustion capacity is controlled to be reduced in size according to the purpose of use. However, the purpose of using hot water is estimated based on the valve opening amount of the proportional valve (that is, proportional valve drive current) that corresponds to the hot water supply / burning capacity (for example, when the proportional valve opening amount is large, when the shower is in use, the proportional When the valve opening amount is small, it is estimated that the valve is being used in the kitchen, etc.), and the bath combustion capacity may be controlled to be reduced by a size according to the purpose of use.

[0109]

According to the present invention, when the combustion of the bath burner is performed within the set waiting time while the hot water supply is stopped, the combustion capacity of the bath burner is controlled to be lower than the steady set combustion capacity of the normal operation. The fan rotation amount of the combustion fan, which is controlled according to the combustion capacity of the bath burner, is controlled to be reduced, and it is possible to suppress the phenomenon of accelerated cooling of the hot water in the hot water supply heat exchanger and the post-boiling rise phenomenon caused by the fan rotation drive. Even if the bath burner is burned while the hot water supply is stopped, it is possible to reduce fluctuations in the hot water temperature such that a large amount of undershoot or overshoot hot water is discharged when the hot spring is restarted. Therefore, the user of the hot water does not experience a sudden change in the hot water temperature when the hot water is again discharged, so that the hot water can be used comfortably.

Further, in the structure provided with the release section,
When the bath burner is not burned from the time when hot water heating is stopped until the start of the release section, even if the burner of the bath burner is started in the release section, the decrease control of the bath combustion capacity is not performed, so the bath combustion capacity is reduced. It is possible to alleviate the problem of poor usability due to control, the problem of deterioration of the durability of the equipment, and the stabilization of the temperature of the re-spout hot water.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a means for stabilizing re-outflow hot water temperature in a combined water heater of the present invention.

FIG. 2 is a flowchart showing an operation example of a re-outflow hot water temperature stabilizing means in the first embodiment.

FIG. 3 is an explanatory diagram showing an example of temperature characteristics of hot water temperature of residual hot water in the hot water heat exchanger after hot water supply is stopped.

FIG. 4 is an explanatory diagram showing a model example of a combined water heater.

FIG. 5 is an explanatory diagram showing a model example of another combined water heater.

[Explanation of symbols]

 1 Bath capacity deterioration control unit 2 Hot water temperature estimation unit 3 Time measurement unit 4 Air flow amount detection unit 5 Capacity reduction control stop unit 6 Instrument temperature sensor 7 Release section setting unit 8 Memory 10 Combustion fan 12 Bath burner 13 Hot water heat exchanger

Front Page Continuation (72) Inventor, Hisayasu Watanabe, 3-4 Fukamidai, Yamato City, Kanagawa Prefecture, Gaster Co., Ltd. (72) Inventor, Kotaro Kimura, 3-4, Fukamidai, Yamato City, Kanagawa Pref., Inside Gaster Co., Ltd.

Claims (8)

[Claims] 1. A hot water supply burner that heats and burns a hot water heat exchanger, a bath burner that heats and burns a reheating heat exchanger, and a common or individual unit that performs the hot air supply and exhaust of the hot water burner combustion and the hot burner combustion. In a combined water heater of a type that has a combustion fan and exhaust gas from the hot water supply burner and exhaust gas from the bath burner are discharged from a common exhaust port, stop hot water supply combustion that is preset as the time for stabilizing the temperature of the re-exposed hot water. When the bath burner is burned during the set waiting time from the start of the longest hot spring to the start of the longest hot water renewal, a bath capacity reduction control unit that reduces the combustion capacity of the bath burner below the steady set combustion capacity in normal operation is provided. Combined water heater characterized by having. 2. The data of the constant decrease amount of the combustion capacity of the bath burner is given in advance, and the bath capacity decrease control unit determines the combustion capacity of the bath burner when the combustion of the bath burner is performed during the set waiting time. The combined water heater according to claim 1, wherein the combined water heater is configured to perform a decrease control over the steady set combustion capacity by the constant decrease amount. 3. A hot water temperature estimating unit for estimating the hot water temperature in the hot water supply heat exchanger with the lapse of time from the hot water supply combustion stop, and a time measuring unit for measuring an elapsed time from the hot water supply combustion stop,
When the bath burner burns during the set standby time, the bath capacity deterioration control unit determines the amount of deviation of the estimated hot water temperature in the hot water heat exchanger at the start of burning the bath burner from the hot water set temperature. The combined water heater according to claim 1, wherein the combustion capacity of the bath burner is continuously or stepwise reduced according to the above. 4. A hot water temperature estimating unit for estimating the hot water temperature in the hot water supply heat exchanger with the lapse of time from the hot water supply combustion stop, and a time measuring unit for measuring the elapsed time from the hot water supply combustion stop,
When the bath burner burns during the set standby time, the bath capacity deterioration control unit estimates the temperature of the hot water in the hot water supply heat exchanger at the start of combustion of the bath burner to be higher than the hot water set temperature. The combustion capacity of the bath burner is reduced accordingly and the estimated temperature of the hot water in the hot water heat exchanger is lower than the hot water set temperature.In the undershoot condition, the combustion capacity of the bath burner is reduced by a certain amount below the steady set combustion capacity. The combined water heater according to claim 1 or 2, which is configured to uniformly control the decrease. 5. An air flow rate detection unit for detecting the air flow rate of the common or hot water supply side combustion fan before the hot water supply combustion is stopped, and the bath capacity lowering control unit is provided with a large air flow rate detected by the air flow rate detection unit. The combined water heater according to claim 1, wherein the combustion capacity of the bath burner is controlled so as to be lower than the steady set combustion capacity in accordance with the level. 6. When a release section is set from the end of the set standby time to the front side of the set standby time and it is detected that the bath burner is not used within the time from the start of the set standby time to the start of the release section. The capacity deterioration control stop unit for stopping the control operation of the bath capacity deterioration control unit at the time of combustion of the bath burner during the hot water supply combustion stop thereafter is provided. Combined water heater. 7. An in-instrument temperature sensor for detecting the in-instrument temperature is provided, and when the in-instrument detected temperature detected by this in-instrument temperature sensor falls below a preset in-instrument reference temperature, the temperature decrease amount is set to the temperature decrease amount. 7. The combined water heater according to claim 6, further comprising a release section setting unit that corrects continuously or stepwise in a direction to reduce the time width of the release section. 8. An in-apparatus temperature sensor for detecting the in-apparatus temperature, a memory in which data of a release section that varies depending on the in-apparatus temperature is provided corresponding to the in-apparatus temperature, and an in-apparatus temperature sensor detect the temperature. 7. The combined water heater according to claim 6, further comprising: a release section setting unit that takes in the detected temperature in the apparatus and sets a release section corresponding to the detected temperature in the apparatus from the data stored in the memory.