JPH09280658A - Complex hot water supply heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to supply hot water of less temperature- fluctuations when starting the resupply of hot water even when the function of a bath is driven during the standing time for the resupply of hot water. SOLUTION: A stand-by time measuring means 2 measures the stand-by time for the resupply of hot water while a bath operation time measuring means 3 measures bath operation time during stand-by time of the resupply of hot water. When the bath function is operated and a combustion fan is driven during the stand-by time of the resupply of hot water, a lost heating value estimation detection unit 5 detects a lost heat volume retained by a hot water supply heat exchanger based on the fan rotary volume information of the combustion fan during the bath operating time. A gas quantity correction unit 6 for starting operation corrects the starting gas quantity to a hot water supply burner, responding to this retained lost heat volume, thus stabilizing the resupplied hot water temperature when starting the resupply of hot water.

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, a hot water supply function and a heating function, and a hot water supply function and other combustion functions.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a model 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 combustion chamber 31, and a bath burner 12 is arranged below the bath combustion chamber 32, respectively. Below the hot water supply burner 11 and the bath burner 12, common air supply / exhaust for both is provided. The combustion fan 10 is installed in the combustion fan 10, and the combustion fan 10 is provided with a fan rotation detection sensor 45 that detects fan rotation information. 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,
A solenoid valve 50 that opens and closes a gas supply passage of the hot water supply burner 11 and a solenoid valve 49 that opens and closes a gas supply passage of the bath burner 12 are incorporated. Also, hot water supply burner
Above the 11 and the bath burner 12, igniter electrodes 26 and 27 for igniting fuel gas, and frame rod electrodes 28 and 29 for detecting the flame of the burner are arranged.

A hot water supply heat exchanger 13 is provided above the hot water supply combustion chamber 31.
However, the bath heat exchangers 14 are arranged above the bath combustion chamber 32, and the water supply pipe 15 is provided at the inlet side of the hot water heat exchanger 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 thermistor 38 for detecting bath temperature is connected to the suction port side of the circulation pump 36, and the other end of the return pipe 17 is connected to an adapter 24 of a bath 39. . The hot water supply pipe 16 and the return pipe 17 are connected to the pouring control valve 19
Also, they are connected by a bypass pipe 25 having 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 a flow rate of incoming water, and a water quantity adjusting means (water quantity adjusting valve) 21 for variably adjusting the flow rate of the incoming water according to a 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.

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

The control device 40, in accordance with the sequence program, based on the output signals from the remote controller and the sensor outputs of various sensors such as the flow sensor 20 and the thermistors 37 and 38,
The valve opening amount control of the proportional valve 22 and the water amount adjusting means 21, the solenoid valve 35,
49, 50 and the pouring control valve 19 are controlled to be opened and closed, the circulation pump 36 is controlled to be driven, etc., to control the operation of appliances such as filling and reheating and hot water supply.

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 hot water is used up and the hot water tap 23 is closed, the passage of water to the hot water heat exchanger 13 is stopped, and when a signal from the flow sensor 20 detects the stop of the flow of water, the electromagnetic The valves 35 and 50 are closed, the hot water supply burner combustion is stopped, and after that, when the post-purge period in which the exhaust gas in the combustion chamber is almost exhausted has passed, the rotation of the combustion fan 10 is stopped and the next hot water is discharged. Be prepared.

Further, 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. Stop burning and finish the filling operation.

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. Then, when the set bath temperature is detected by the thermistor 38, the solenoid valves 35 and 49 are closed to stop the combustion of the bath burner 12 and the circulation pump.
Stop 36 and finish the reheating operation.

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. 6, separate hot water supply burner 11 and bath burner 12 are provided with individual combustion fans 10a and 10b, respectively. There are also things. Like this, burner 1
In the equipment in which the individual combustion fans 10a and 10b are installed in 1 and 12, respectively, one of the burners burns and the other burner stops in order to prevent backflow of exhaust gas. The combustion fan on the burner side during combustion is rotated together with the combustion fan on the burner side during combustion to prevent exhaust gas from flowing backward from the upper side to the lower side of the combustion chamber on the combustion stop side. There is. Note that the instrument configuration of FIG. 6 is the same as the instrument configuration of FIG. 5 described above, so description thereof will be omitted.

Further, in the combined water heater of FIGS. 5 and 6, the proportional valve 22 common to the hot water supply burner 11 and the bath burner 12 was provided, but the hot water supply burner 11 and the bath burner 12 were used. There is also a combined water heater in which separate proportional valves are provided for and.

By the way, after the hot water supply plug 23 is closed, that is, after the hot water supply is stopped, the hot water remaining in the hot water supply heat exchanger 13 is boiled immediately after the hot water is stopped as shown by a solid curve A in FIG. Due to the phenomenon that the amount of heat stored in the hot water supply device 13 is transferred to the hot water remaining in the hot water supply heat exchanger 13 and the hot water temperature rises, the hot water temperature becomes higher than the set hot water temperature (overshoot). With the cooling of the exchanger 13 (loss of the amount of heat possessed), the residual hot water begins to cool, and after the elapse of the post-boiling time, the hot water has a hot water temperature (undershoot) lower than the set hot water supply temperature, and then gradually cools down.

From the above, when the hot water is again discharged immediately after the hot water supply is stopped, the overshoot of hot water due to the residual hot water comes out. Further, when hot water is again discharged after a long time e.g. T minutes (for example, 5 minutes) after the hot water supply is stopped, the residual hot water of the undershoot of the hot water 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 a 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 is stopped as shown by the solid curve A in FIG. In order to more quickly compensate the drop amount Δk of the hot water temperature based on the estimated temperature characteristic, the startup gas amount is increased and the Q function is performed.

Further, as shown in FIG. 4, the appliance is usually provided with an ignition standard time Δt _f of the hot water supply burner 11 at the time of starting up the gas amount for re-hot water, and further, immediately after the burner is ignited, the gas amount is increased. Start-up timing time (margin time) Δt
Is provided, and the gas amount is raised when the gas amount raising timing time Δt elapses. The present applicant has also proposed that the timing time Δt be varied according to the magnitude of the hot water temperature drop Δk to perform the Q function (unpublished).

[0018]

[Problems to be Solved by the Invention] The proposed Q-function method used for the above-mentioned combined water heater assumes a single-function water heater having only a hot-water supply function, and can be used while waiting for hot water to come out again (waiting for Q function). The operation of the bath function was not considered. For example, in the combined water heater as shown in FIG. 5, when the bath function is activated and the combustion fan 10 is rotationally driven during the re-hot-standby time, ventilation is generated not only in the bath combustion chamber 32 but also in the hot water combustion chamber 31. By this ventilation, 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 fluctuates, resulting in the Q function proposed above. There is a problem that the Q function cannot be achieved by the method of.

Further, when the hot water supply burner 11 is large and has a large amount of heat stored therein, if the bath function is activated immediately after the hot water supply 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, and The residual hot water in the exchanger 13 is heated,
Similarly to the above, the temperature characteristic of the residual hot water in the hot water supply heat exchanger 13 fluctuates, and similarly, there is a problem that the proposed method cannot achieve the Q function.

As described above, in the combined water heater, when the bath function is activated and the combustion fan 10 is driven to rotate while the hot water is on standby, the temperature characteristic of the hot water temperature changes as shown by the solid curve A in FIG. However, there is a problem that undershooting or overshooting hot water comes out at the time of hot water re-flowing even though the Q function is performed, which gives the user of hot water uncomfortable feeling of fluctuation in hot water temperature.

Also, in the combined water heater as shown in FIG. 6, as described above, when the bath function is activated during the re-hot-standby state, the backflow of exhaust gas is prevented and the combustion fan on the bath side is prevented.
Not only 10b but also the combustion fan 10a on the hot water supply side has to be driven, so the same problem as described above occurs.

The present invention has been made to solve the above problems, and an object thereof is to change the hot water temperature at the time of re-releasing hot water even if the bath function operates while waiting for re-releasing hot water (waiting for Q function). It is an object of the present invention to provide a combined water heater that supplies less hot water.

[0023]

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 for a hot water supply function that performs heating and combustion of a hot water supply heat exchanger, another function burner that performs other function combustion other than hot water supply, and the supply and exhaust of the hot water supply burner combustion and other function burner combustion. In the combined water heater of the type that has a common or individual combustion fan that performs the above, the exhaust gas of the hot water supply burner and the exhaust gas of other function burners are discharged from the common exhaust port Standby time measuring means for measuring the waiting time for re-melting hot water until the start of burning hot water, other function operating time measuring means for measuring the burning operation time of the other function burner during the waiting time for re-melting hot water, and other function operating time measuring means Based on the fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during the operation time of other functions measured by The startup gas amount of the hot water supply burner at the start of re-releasing hot water is stepwise according to the amount of heat loss estimated and detected by the heat loss estimation and detection unit. Alternatively, it has a startup gas amount correction unit that continuously increases and corrects.

A second aspect of the present invention is a hot water supply burner for heating and burning the hot water heat exchanger, another function burner for performing other function combustion other than hot water supply, and the supply of the hot water burner combustion and other function burner combustion. A common or individual combustion fan that performs exhaust, and a water amount adjusting unit that variably adjusts the hot water supply amount, and the exhaust gas of the hot water supply burner and the exhaust gas of other function burners are discharged from a common exhaust port. In the water heater, a standby time measuring means for measuring the waiting time for re-releasing hot water from the stop of combustion of the hot water supply burner to the start of combustion of re-leaving hot water, and another function operation for measuring the combustion operation time of another function burner during the waiting time for re-leasing hot water Hot water supply heat exchange based on time measurement means and fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during the other function operation time measured by the other function operation time measurement means Heat loss estimation / detection unit that estimates and detects directly or indirectly the retained heat loss amount, and re-releasing hot water according to the magnitude of the retained heat loss amount of the hot water heat exchanger estimated and detected by the loss heat amount estimation and detection unit. An initial hot water supply amount correction unit that corrects the initial hot water supply amount adjusted by the water amount adjusting means at the start stepwise or continuously is configured.

A third aspect of the present invention is a hot water supply burner for heating and burning the hot water heat exchanger, another function burner for performing other function combustion other than hot water supply, and supply of the hot water burner combustion and other function burner combustion. In a combined water heater of a type that has a common or individual combustion fan that performs exhaust, and the exhaust gas of the hot water supply burner and the exhaust gas of other function burners are discharged from the common exhaust port, from the time when the combustion of the hot water supply burner is stopped Standby time measuring means for measuring the waiting time for re-leaving hot water until the start of combustion of re-hot water, other function operating time measuring means for measuring the combustion operation time of the other function burner during the waiting time for re-leasing hot water, and other function operating time measurement Based on the fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during the other function operating time measured by the means, the direct or indirect retained heat loss amount of the hot water heat exchanger is determined. According to the amount of heat loss estimated by the constant heat loss estimation detector and the loss of heat retained by the hot water supply heat exchanger estimated by the heat loss estimation detector, the amount of gas after the ignition of the hot water supply burner at the start of hot water refueling stands up. And a gas amount rising timing correction unit that advances the rising timing time stepwise or continuously.

A fourth invention is a rising gas amount correcting section which constitutes the first invention, an initial hot water supply amount correcting section which constitutes the second invention, and a gas amount rising timing which constitutes the third invention. The configuration is characterized in that two or more correction units are provided in combination.

In the present invention having the above-described structure, for example, when the hot water supply tap is closed and the combustion of the hot water supply burner is stopped, the standby time measuring means measures the re-emergence waiting time from the time when the combustion of the hot water supply burner is stopped to the time when the re-emergence combustion starts. To do. When the burner of other function burns while waiting for re-hot water, the other function operation time measuring means measures the combustion operation time of the other function burner, and the heat loss estimation detector detects other function burner combustion The stored heat loss amount of the hot water supply heat exchanger is estimated directly or indirectly based on the fan rotation amount information of the combustion fan during the operation time.

In the first aspect of the present invention, the start-up gas amount correction unit determines the start-up gas amount of the hot water supply burner at the start of re-emission as the estimated loss of heat loss of the hot water supply heat exchanger detected above increases. The startup gas amount is continuously increased and corrected according to the amount of heat loss retained, such as increasing the amount. Alternatively, the startup gas amount is increased and corrected stepwise according to the amount of heat loss retained. In this way, the startup gas amount of the hot water supply burner at the start of re-hot water is increased and the combustion heat amount of the hot water supply burner at the start of re-hot water is increased, so that the amount of heat loss retained by the hot water supply heat exchanger is instantly compensated. As a result, the temperature of the re-exposed hot water is stabilized.

In the second aspect of the invention, the initial hot water supply amount correction unit reduces the initial hot water supply amount stepwise or continuously in order to decrease the initial hot water supply amount when the heat loss loss of the hot water supply heat exchanger increases. After correction, the water amount adjusting means adjusts the opening amount of the valve so that the initial hot water supply amount at the start of re-hot water discharge becomes the corrected initial hot water supply amount. In this way, the amount of heat received by the running water per unit volume increases due to the decrease in the amount of running water in the hot water supply heat exchanger at the start of re-leaving hot water, and as in the first aspect of the invention, the retained heat loss of the hot water supply heat exchanger is reduced. It is compensated and the temperature of the re-outflow hot water is stabilized.

According to the third aspect of the present invention, the gas amount rising timing correction unit shortens the gas amount rising timing time when the stored heat loss amount of the hot water heat exchanger increases, so that the stored heat loss amount is large. The amount of heat loss of the hot water supply heat exchanger is compensated earlier by shortening the gas amount start-up timing stepwise or continuously and speeding up the rise of the hot water supply burner accordingly. As in the invention, the temperature of the re-outflow hot water is stabilized.

In the fourth invention, the first or second
Alternatively, in the third invention, the function of stabilizing the re-outflow hot water temperature at the start of the re-outflow hot water is performed in a combined manner, and hot water with less fluctuation in the hot water temperature is supplied.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. Each of the embodiments described below is intended for the combined water heater having the hot water supply function and the bath function shown in FIGS. 5 and 6, and the description of FIGS. Omitted because there is. FIG. 1 shows a configuration (configuration of the control device 40) characteristic of each embodiment described below, and the first embodiment includes a standby time measuring unit 2 and other functions. It is configured to have a bath operation time measuring unit 3 which is an operation time measuring unit, a correction operation determination unit 9, a heat loss estimation and detection unit 5, and a startup gas amount correction unit 6.

The standby time measuring means 2 has a timer (hereinafter referred to as a Q timer), the hot water tap 23 of the kitchen or the like is closed, the flow rate sensor 20 detects the stop of the flow of water, and outputs a flow rate stop signal. Then, it is determined that the combustion of hot water supply burner 11 has stopped and the hot water re-burning standby state has been entered, and the Q timer is driven by a timer and a hot water re-feeding standby start signal is output. When the hot water tap 23 is opened and the flow sensor 20 detects running water and outputs a running water signal while the Q timer is in operation, it is determined that re-hot water starts, the Q timer is stopped, and at the same time, a re-hot water start signal is output, and Q
The time from the start of driving of the timer to the stop of the timer is output as the re-hot water waiting time (Q function waiting time) T _Q , and the Q timer is reset in preparation for the next re-waiting time measurement.

The standby time measuring means 2 is previously provided with a hot water discharge standby time limit T _R (for example, 510 seconds), and when the above T _R has elapsed after the Q timer started driving the timer, the hot water supply heat Since it was judged that the re-outflow hot water temperature was not stabilized because the residual hot water in the exchanger 13 was completely cold and it became a cold start, all operations related to the stabilization of the re-outflow hot water temperature were stopped, and the next Prepare for the stabilization operation of the hot water temperature.

The bath operation time measuring means 3 is a timer (hereinafter referred to as H
(Hereinafter referred to as a timer), and during the re-hot water waiting time, that is, between the time when the waiting time measuring means 2 outputs the re-hot water waiting start signal and the time when the re-hot water starting signal is output. When the rod electrode 29 detects the burner combustion of the bath burner 12 and the operation of the bath function is detected, the H timer is driven by the timer, and the frame rod electrode is driven in the H timer driven state.
When 29 detects the combustion stop of the bath burner 12 and the stop of the bath function is detected, the H timer is stopped. The time from the start of driving the H timer to the stop is H
When the timer is driven, it is accumulated each time, and is output as the bath function operation time T _H at the time of starting the re-emergence.
Further, at the start of re-emergence, the H timer is reset in preparation for the next bath function operation time measurement.

As described above, the bath operation time measuring means 3 drives the H timer while the hot water is on standby again.
When the operation of the bath function is continuously performed before the re-hot-standby waiting (stopping hot water supply) and after the start of the re-hot-water releasing standby, the H timer is driven by the timer at the start time of the re-hot-holding waiting (when hot water supply is stopped). Further, if the bath function continues to be operated after the start of re-emergence from the standby state for re-emergence, the H timer is stopped at the start of re-emergence.

The correction operation determination unit 9 is a frame rod electrode.
Based on the output signal of 29, it is determined whether the bath function, that is, the combustion fan has operated while waiting for hot water to come out again. When it is determined that the bath function has operated while waiting for hot water to come out again, the correction operation for the combustion fan operation If it is determined that the bath function is not operating while waiting for the hot water to come out, it is determined that it is not necessary to perform the correction operation for the combustion fan operation. Outputs no correction signal.

The heat loss estimation and detection unit 5 has a built-in memory,
In the memory, the rotation of the combustion fan (combustion fan 10 common to hot water supply burner 11 and bath burner 12 in FIG. 5 and combustion fan 10a of hot water supply burner 11 in FIG. 6) per sampling time during bath function operation An arithmetic expression is given for integrating the product of the number and its sampling time over the bath function operating time T _H. Also, a combustion fan that is operating the bath function
Based on the rotation amount of 10 (10a), an arithmetic expression for obtaining the retained heat loss amount of the hot water supply heat exchanger 13 due to the bath function operation, or the relational data between the fan rotation amount and the retained heat loss amount is previously experimentally obtained. Has been asked and given.

When the correction operation determination section 9 determines that the correction operation determination section 9 needs to perform a correction operation and outputs a correction presence signal, the combustion fan 10 (10a) based on the bath function operation time T _H. ) Fan rotation amount is calculated. The calculated fan rotation amount is substituted into the arithmetic expression for calculating the retained heat loss amount, and the retained heat loss amount of the hot water supply heat exchanger 13 is directly detected, or the calculated fan rotation amount is calculated as the relational data. The estimated heat loss amount of the hot water supply heat exchanger 13 is directly estimated and detected.

For example, as described above, when the cooling of the hot water supply heat exchanger 13 is promoted by rotationally driving the combustion fan while waiting for the hot water to come out again, the hot water is supplied as the fan rotation amount of the combustion fan increases. The amount of heat loss retained by the heat exchanger 13 increases in the positive direction. Also, when the hot water supply burner 11 is large and the amount of heat retained is large and the hot water supply heat exchanger 13 is heated by the ventilation of the combustion fan, the fan of the combustion fan is heated. As the rotation amount increases, the retained heat loss amount of the hot water supply heat exchanger 13 increases in the negative direction.

The start-up gas amount correction unit 6 has a heat-up loss amount of the hot water supply heat exchanger 13 and a start-up gas correction amount for correcting the start-up gas amount according to the amount of the heat loss. The relationship data (startup gas correction amount data) with and is obtained in advance through experiments, calculations, and the like. This relational data may be continuously given in some cases, or may be given stepwise, in which the startup gas correction amount corresponding to the retained heat loss amount is given.

The start-up gas amount correction unit 6 includes a hot water supply heat exchanger 13 driven by a combustion fan in the heat loss estimation and detection unit 5.
When the retained heat loss amount is detected, the retained heat loss amount is collated with the startup gas correction amount data to detect the startup gas correction amount. By this correction amount, when the cooling of the hot water supply heat exchanger 13 is promoted by the driving of the combustion fan in the standby state for re-hot water, that is, when the retained heat loss amount of the hot water supply heat exchanger 13 is positive, it is in the positive direction. The startup gas amount is increased and corrected. Further, when the hot water supply heat exchanger 13 is heated by the driving of the combustion fan in the standby state for re-hot water, that is, when the retained heat loss amount of the hot water supply heat exchanger 13 is negative, the amount of gas rising in the negative direction is The increase is corrected. In other words, the amount of startup gas is corrected to decrease.

The proportional valve adjusting means 47 is preliminarily provided with data of the valve opening drive current of the proportional valve 22 corresponding to the amount of gas supplied to the burner by the feedforward calculation at the start of re-melting, and the proportional valve adjusting means 47 is provided. Is the startup gas amount correction unit 6
The proportional valve 22 corresponding to the startup gas correction amount detected in
The valve opening drive current is corrected and the valve opening amount of the proportional valve 22 is controlled by the corrected valve opening drive current. The amount of startup gas is increased (decreased when the retained heat loss is negative) in accordance with the amount of the amount of heat, and the combustion heat of the hot water supply burner 11 is increased to increase the fluctuation of the hot water temperature due to the operation of the combustion fan. Compensate quickly and accurately to stabilize the temperature of the re-outflow hot water.

Next, an example of the operation of the means for stabilizing the re-outflow hot water temperature at the start of the re-outflow hot water in the above configuration will be briefly described with reference to the flowchart of FIG. First, in step 101, the flow sensor 20 detects the stop of the flow of water, and the hot water burner
When the combustion stop in 11 is detected, the Q timer of the standby time measuring means 2 is started to drive in step 102, and it is determined in step 103 whether or not the bath function (combustion fan) has operated, and the frame rod electrode 29 When the operation of the bath function is detected by, it is determined that the bath function has operated, and in step 104, the driving of the H timer of the bath operation time measuring means 3 is started.

In step 105, it is judged whether or not re-hot water is started, and when the hot water tap 23 is opened and the flow sensor 20 detects running water, it is judged that the re-hot water is started, and the Q timer is stopped to re-hot water. The waiting time T _Q is detected. Step 10
In step 6, it is determined whether the bath function has been activated while waiting for hot water to come out again. When it is determined that the bath function has operated, it is determined in step 108 that the correction operation for the combustion fan operation needs to be performed, and based on the bath function operation time _TH and the fan rotation speed during standby for re-emergence. The amount of rotation of the combustion fan is calculated by detecting the amount of heat loss of the hot water heat exchanger 13
Correct the amount of startup gas.

When it is determined in step 105 that hot water has not been re-extracted, the process proceeds to step 107. Step 107
Then, it is judged whether the re-emergence waiting time T _Q exceeds the re-emergence waiting time T _R (for example, 510 seconds), and T
_{When Q} does not exceed T _R , the operations after step 103 are repeated, and when it is determined in step 103 that the bath function has stopped, the H timer is stopped in step 110. Further, it is determined in step 105 that re-hot water has not started, and in step 107, T _Q
If T exceeds T _R , in step 109 it is judged that the hot water in the hot water supply heat exchanger 13 is cold enough to cause a cold start, and the hot water temperature is not stabilized again. The stabilization operation of the hot water temperature ends.

When it is determined in step 106 that the bath function does not operate during the waiting for re-hot water, the combustion fan operation is not corrected (step 111).

According to the above embodiment, in the combined water heater, the heat loss estimating and detecting section for estimating and detecting the heat loss amount held in the hot water heat exchanger 13 on the basis of the fan rotation amount information of the combustion fan while waiting for the re-hot water supply. 5 and the startup gas amount correction unit 6 that corrects the startup gas amount according to the amount of heat loss retained, the combustion fan 10 (10a) is rotated by the operation of the bath function while waiting for re-releasing hot water. Driven hot water supply combustion chamber 31
Ventilation is generated in the interior, and this ventilation promotes cooling of the hot water supply heat exchanger 13, or conversely, if the hot water supply burner 11 is large and the amount of heat retained is large and the hot water supply heat exchanger 13 is heated, it is lost. The heat quantity estimation / detection unit 5 uses the combustion fan
The retained heat loss amount of the hot water supply heat exchanger 13 is detected based on the fan rotation amount of a). Then, the startup gas amount correction unit 6
However, depending on the magnitude of the retained heat loss amount, when the retained heat loss amount is positive, the startup gas amount is increased, and when the retained heat loss amount is negative, the startup gas amount is decreased. In addition, the startup gas amount can be corrected, and the startup gas amount that compensates for the fluctuation amount of the hot water temperature due to the rotational driving of the combustion fan can be accurately detected.

As described above, when the increase correction or the retained heat loss amount is negative, the combustion heat amount of the hot water supply burner 11 corresponding to the amount of the startup gas amount decreased and corrected causes the combustion fan to rotate during the standby for re-leaving hot water. Even when driven, the amount of fluctuations in the hot water temperature is promptly and accurately compensated for when the hot water is restarted, the hot water temperature is stabilized accurately, and the rising of the hot water temperature is delayed, causing undershoot hot water. There is no fluctuation in the temperature of the hot water that is discharged or the hot water of the overshoot is discharged due to the heat of the burner having a large amount of heat, and the user of the hot water can comfortably use the hot water.

The second embodiment will be described below with reference to FIG. A feature of the present embodiment that is different from the first embodiment is that an initial hot water supply amount correction unit 7 is provided in place of the startup gas amount correction unit 6, and the hot water re-releasing is performed. This means that when the bath function is activated during standby, the initial hot water supply amount at the start of re-hot water is squeezed to stabilize the hot-water temperature. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

The initial hot water supply amount correction unit 7 includes a hot water supply heat exchanger 13
The relationship data (initial hot water supply correction amount data) between the stored heat loss amount and the initial hot water supply correction amount for correcting the initial hot water supply amount according to the magnitude of the stored heat loss amount is obtained in advance by experiments or calculations. Has been. This relational data may be given in a continuous manner or in a stepwise manner when the initial hot water supply correction amount corresponding to the retained heat loss amount is given.

The initial hot water supply amount correction unit 7 determines the stored heat loss amount when the stored heat loss amount of the hot water supply heat exchanger 13 due to the driving of the combustion fan is detected by the heat loss estimation and detection unit 5. The initial hot water supply correction amount is detected by collating with the amount data. By this correction amount, when the cooling of the hot water supply heat exchanger 13 is promoted by the driving of the combustion fan in the standby state for re-hot water, that is, when the retained heat loss amount of the hot water supply heat exchanger 13 is positive, it is in the positive direction. The initial hot water supply amount is throttle-corrected. Further, when the hot water supply burner 11 has a large size and the amount of heat stored therein is large, when the hot water supply heat exchanger 13 is heated by the drive of the combustion fan while waiting for re-emergence, that is, the amount of heat loss retained by the hot water supply heat exchanger 13 is negative. In some cases, the initial hot water supply amount is throttle-corrected in the negative direction. That is, the amount of initial hot water supply is corrected to increase.

The water amount adjusting means 21 adjusts the valve opening amount in accordance with the detected initial hot water supply correction amount to correct the initial hot water supply amount to reduce the flowing water amount at the start of re-emergence of the hot water supply heat exchanger 13 or If the amount of heat loss retained is negative, increase it.
In other words, the amount of heat received by the running water per unit volume from the hot water supply heat exchanger 13 is increased or decreased to more quickly compensate for the fluctuation amount of the hot water temperature due to the rotational drive of the combustion fan, and to stabilize the hot water temperature again.

In the second embodiment, when the bath function is activated during the waiting for hot water to be left again, the initial hot water supply amount at the time of hot water returning is corrected according to the amount of heat loss of the hot water heat exchanger 13. By stabilizing the temperature of the re-outflow hot water by the above method, the same excellent effect as that of the first embodiment can be obtained.

The third embodiment will be described below with reference to FIG. A feature of the present embodiment that is different from the first embodiment is that a gas amount rising timing correction unit 8 is provided in place of the rising gas correction unit 6, and is in the standby state for re-emergence. When the bath function is activated, the gas amount rising timing time Δt as shown in FIG. 4 is corrected to stabilize the temperature of the hot water again. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

The gas amount rising timing correction unit 8 includes
Relationship data between the amount of heat loss retained by the hot water supply heat exchanger 13 and the gas amount startup timing correction time for correcting the gas amount startup timing time according to the amount of the retained heat loss amount (gas amount startup The timing correction time data) is obtained in advance by experiments, calculations, etc. This relational data may be continuously given in some cases, or may be given stepwise, in which the gas amount rising timing correction time corresponding to the retained heat loss amount is given.

When the amount of heat loss estimation detector 5 detects the amount of heat loss retained by the hot water supply heat exchanger 13 by driving the combustion fan, the amount of heat loss estimation unit 8 determines the amount of lost heat loss as the amount of gas loss. The gas rise timing correction time is detected by checking the amount rise timing correction time data. By this correction time, when the cooling of the hot water supply heat exchanger 13 is promoted by the driving of the combustion fan in the standby state for re-hot water, that is, when the retained heat loss amount of the hot water supply heat exchanger 13 is positive, it is in the positive direction. The gas amount startup timing time is shortened and corrected. Further, when the hot water supply burner 11 is large and the amount of heat stored therein is large and the hot water supply heat exchanger 13 is heated by the driving of the combustion fan in the standby mode for re-hot water, that is,
When the retained heat loss amount of the hot water supply heat exchanger 13 is negative, the gas amount rising timing time is shortened and corrected in the negative direction. That is, the timing is corrected to be longer.

Then, the proportional valve adjusting means 47 controls the startup valve opening timing of the proportional valve 22 in accordance with the gas amount rising timing time (advance when the retained heat loss amount is positive, and the retained heat loss amount is negative). Delay), and change the startup of the hot water supply burner 11 at the start of re-hot water,
The amount of fluctuations in the hot water temperature due to the rotational drive of the combustion fan is compensated for earlier to stabilize the hot water temperature.

In the third embodiment, when the bath function (combustion fan) operates while waiting for hot water to be left again, at the start of hot water discharge, according to the amount of heat loss retained by the hot water heat exchanger 13, Correct the gas amount rise timing time to shorten the gas amount rise timing time when the retained heat loss amount is positive, and to extend the gas amount rise timing time when the retained heat loss amount is negative. By stabilizing the temperature of the rediscovered hot water, the same excellent effect as that of the first embodiment can be achieved.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above-described embodiments, when the bath function is activated during the waiting for re-hot water, any one of the correction of the startup gas amount, the initial hot water supply amount, and the gas amount startup timing time is corrected. Although the re-outlet hot water temperature is stabilized by performing the above, it is also possible to combine the above corrections two or more to stabilize the re-outlet hot water temperature in a complex manner. 2 or more of the start-up gas amount correction unit 6, the initial hot water supply amount correction unit 7, and the gas amount start-up timing correction unit 8 are provided in combination in the device for stabilizing the above. By re-stabilizing the temperature of redefusion hot water in a complex manner,
The fluctuation amount of the hot water temperature of the residual hot water in the hot water supply heat exchanger 13 due to the rotational driving of the combustion fan can be more promptly compensated, and the effect of stabilizing the hot water supplied again can be further enhanced.

In each of the above embodiments, the bath operation time measuring means 3 measures the bath operation time by judging the presence or absence of the bath function operation by the frame rod electrode 29, but the fan rotation detection sensor 45 is used. And output information of other sensors such as the water switch 33, a drive start signal of the circulation pump 36,
The bath operation time may be measured by determining the presence or absence of the bath function operation based on the valve opening signal of the solenoid valve 49 or the like.

Furthermore, in each of the above-mentioned embodiments, the description has been made by taking the combined water heater having the hot water supply function and the bath function as an example, but the present invention has the hot water supply function and the heating function, and other hot water supply functions and other functions. The present invention can be applied to a combined water heater of a type that has a combustion function and exhaust gas generated by combustion is discharged from a common exhaust port.

Further, in each of the above embodiments, the amount of heat loss retained in the hot water supply heat exchanger 13 is detected based on only the fan rotation amount of the combustion fan during the bath operation time.
Further, if the retained heat loss amount is calculated in consideration of other information such as the outside air temperature, the retained heat loss amount can be detected more accurately.

Further, in each of the above embodiments, the product of the number of revolutions of the combustion fan per sampling time and the sampling time is integrated over the bath operation time T _H to detect the fan rotation amount of the combustion fan. However, the re-outlet waiting time T
_Q or preset re-outlet waiting time T _R
(For example, 510 seconds) The ratio of the bath operation time T _H occupying (the bath operation ratio, T _H / T _Q or T _H / T _R ) is obtained, and the fan rotation amount of the combustion fan is indirectly determined based on this bath operation ratio. It may be estimated and detected. Further, in an instrument provided with an air volume sensor, the fan rotation amount of the combustion fan may be detected based on the sensor output of the air volume sensor.

Further, in each of the above-described embodiments, the amount of heat loss retained in the hot water supply heat exchanger 13 is directly determined according to the amount of rotation of the combustion fan and the amount of fan rotation of the combustion fan based on the bath operating time. in had estimated detectably may have indirectly estimated detect potential heat loss of the hot water supply heat exchanger 13 on the basis of the bath operating ratio (T _H / T _Q or T _H / T _R). Further, in an appliance provided with an air flow sensor, the retained heat loss amount of hot water supply heat exchanger 13 may be estimated directly or indirectly based on the sensor output of the air flow sensor.

[0066]

According to the present invention, since the heat loss estimation and detection unit and the startup gas amount correction unit, the initial hot water supply amount correction unit, or the gas amount startup timing correction unit are provided, the re-hot-water waiting time When the bath function is activated and the combustion fan is driven inside, the loss-heat-amount estimation detection unit detects the amount of heat loss of the hot water supply heat exchanger based on the fan rotation amount information of the combustion fan. In response to this, the startup gas amount correction unit increases and corrects the startup gas amount. Alternatively, the initial hot water supply amount correction unit squeezes and corrects the initial hot water supply amount. Alternatively, the gas amount rising timing correction unit shortens and corrects the gas amount rising timing time. in this way,
Depending on the amount of heat loss of the hot water heat exchanger, the start-up gas amount or the initial hot water amount or the gas amount start-up timing time is corrected. Even if the function is activated, fluctuations in hot water temperature such as undershoot and overshoot hot water coming out at the start of hot water reflow are suppressed, and users of hot water do not undergo a sudden hot water temperature change when hot water is re-opened. You can use hot water comfortably.

[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 embodiment.

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

FIG. 4 is an explanatory diagram showing a gas amount rising timing time at the start of re-melting.

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

FIG. 6 is an explanatory diagram showing a model example of another combined water heater.

[Explanation of symbols]

 2 Standby time measuring means 3 Bath operating time measuring means 5 Loss of heat estimation detection unit 6 Startup gas amount correction unit 7 Initial hot water supply amount correction unit 8 Gas amount startup timing correction unit 10 Combustion fan 13 Hot water supply heat exchanger 21 Water amount adjustment unit 22 Proportional valve

Claims (4)

[Claims] 1. A hot-water supply burner for a hot-water supply function that heats and burns a hot-water supply heat exchanger, another burner that performs another function combustion other than hot water supply, and a common supply and exhaust for the hot-water burner combustion and other function burner combustion. Or a separate combustion fan and the exhaust gas of the hot water supply burner and the exhaust gas of other function burners are discharged from a common exhaust port. Standby time measuring means for measuring the re-hot water waiting time until time, other function operating time measuring means for measuring the combustion operating time of the other function burner during the re-hot water waiting time, and the other function operating time measuring means. Other function The estimated amount of heat loss directly or indirectly held by the hot water supply heat exchanger is estimated and detected based on the fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during operating time. Depending on the amount of heat loss possessed by the hot water supply heat exchanger estimated and detected by the heat loss estimation and detection unit, the startup gas amount of the hot water supply burner at the start of re-hot water is stepwise or continuous. A complex water heater having a startup gas amount correction unit for performing incremental increase correction. 2. A hot water supply burner for a hot water supply function for heating and burning a hot water heat exchanger, another function burner for performing other function combustion other than hot water supply, and a common supply and exhaust for the hot water supply burner combustion and other function burner combustion. Or a separate combustion fan, and a water amount adjusting means for variably adjusting the amount of hot water supply, in a combined water heater of the type in which exhaust gas of the hot water supply burner and exhaust gas of other function burners are discharged from a common exhaust port, A waiting time measuring means for measuring the waiting time for re-releasing hot water from the combustion stop of the hot water supply burner to the start of combustion for re-releasing hot water, and another function operating time measuring means for measuring the burning operation time of another function burner during the waiting time for re-hot tapping , The direct or hot water heat exchanger based on the fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during the other function operation time measured by the other function operation time measuring means. The amount of water lost at the start of hot water re-emergence according to the amount of heat loss estimated and detected by the indirect heat loss estimation and the estimated amount of lost heat in the hot water supply heat exchanger A composite hot water supply device, comprising: an initial hot water supply amount correction unit that corrects the initial hot water supply amount adjusted by the adjusting means stepwise or continuously. 3. A hot water supply burner for a hot water supply function that performs heating and combustion of a hot water heat exchanger, another function burner that performs other function combustion other than hot water supply, and a common supply and exhaust for the hot water supply burner combustion and other function burner combustion. Or a separate combustion fan and the exhaust gas of the hot water supply burner and the exhaust gas of other function burners are discharged from a common exhaust port. Standby time measuring means for measuring the re-hot water waiting time until time, other function operating time measuring means for measuring the combustion operating time of the other function burner during the re-hot water waiting time, and the other function operating time measuring means. Other function The estimated amount of heat loss directly or indirectly held by the hot water supply heat exchanger is estimated and detected based on the fan rotation amount information of the common combustion fan or the hot water supply function side combustion fan during operating time. Depending on the amount of loss of heat retained in the hot water supply heat exchanger estimated and detected by the heat loss estimation and detection unit, the timing for starting the amount of gas after ignition of the hot water supply burner at the start of re-leasing hot water And a gas amount start-up timing correction unit that accelerates stepwisely or continuously. 4. A combination of two or more of the startup gas amount correction unit according to claim 1, the initial hot water supply amount correction unit according to claim 2, and the gas amount startup timing correction unit according to claim 3. Combined water heater characterized by having.