JPH10300222A - Hot water supply burning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively avoid high temperature hot water supply when starting hot water supply. SOLUTION: When delayed water temperature rise in a hot water supply heat exchanger 1 is detected, valve travels of first and second flow control means GM1 , GM2 are set to a delayed rise eliminating standby position. When hot water supply is started from the state, the travels of the means GM, GM are controlled to variably control a flow ratio of hot water flow from the exchanger 1 side to water passing flow of a feed water control bypass passage 18 in a delayed rise eliminating direction. Water of the passage 18 is mixed with hot water from the exchanger 1 to eliminate the delayed rise. When mixing end condition is satisfied during mixing, the means GM1 , GM2 are transferred to steady positions for steady operations. When hot water supply is stopped before the end condition is satisfied, hot water of the delayed rise is retained in the exchanger 1, and hence the means GM1 , GM2 are transferred to delayed rise eliminating standby position for hot water supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply / combustion apparatus for heating running water passing through a hot water supply heat exchanger by burner combustion and supplying hot water produced by the heating to a desired hot water supply place.

[0002]

2. Description of the Related Art FIG. 23 shows a schematic configuration of a hot water supply combustion apparatus which was previously produced by the applicant. In the figure, a hot water supply heat exchanger 1 is connected to a water supply passage 2 on the inlet side, and a hot water supply heat exchanger 1 is connected to a hot water supply passage 3 on the outlet side. The hot water supply heat exchanger 1 is provided between the water supply passage 2 and the hot water supply passage 3.
Is provided, and a bypass valve 4 is provided in the bypass passage 4 to open and close the passage.
In the water supply passage 2, a flow rate sensor FS for detecting a flow rate of water supply is provided.
And a feedwater temperature sensor 6 for detecting the feedwater temperature. Further, a heat exchange side temperature sensor 7 is provided on the outlet side of the hot water supply heat exchanger 1. A hot water supply temperature sensor 8 is provided at a position slightly downstream of the connection between the bypass passage 4 and the hot water supply passage 3.

The hot water supply heat exchanger 1 is heated by the flame of a burner 10, and a gas passage 11 is connected to the burner 10, and a solenoid valve 12 for opening and closing the passage is connected to the gas passage 11. , 13 and a proportional valve 14 for controlling the amount of gas supplied to the burner 10 by the amount of valve opening.

The hot water supply and combustion device is operated by a control device 15, and a remote controller 9 is signal-connected to the control device 15.

[0005] The remote controller 9 is provided with a power switch, an operation switch, a temperature setting device for setting a set temperature of hot water supply, a display section for displaying various information such as a set temperature of hot water supply, and the like.

The control device 15 is provided with a hot water tap (not shown) provided on the hot water supply outlet side of the external pipe connected to the hot water supply passage 3.
Is opened and when the flow rate sensor FS detects a flow rate equal to or higher than the operating flow rate, the combustion fan (not shown) is rotated to supply combustion air to the burner 10 and the solenoid valves 12 and 13 are turned on.
Then, the proportional valve 14 is opened and the ignition means (not shown) is driven to perform the point ignition of the burner 10 so that the hot water temperature detected by the hot water temperature sensor 8 becomes the hot water set temperature set by the remote controller 9. The heat of combustion of the burner 10 is controlled. By this combustion control, flowing water entering the hot water supply heat exchanger 1 from the water supply passage 2 is heated when passing through the hot water supply heat exchanger 1 to become hot water, and this hot water is guided to a desired hot water supply place through the hot water supply passage 3. When the use of hot water is finished and the hot-water tap is closed, a flow-off signal is output from the flow rate sensor FS, and in response to this signal, the control device 15 shuts off the gas passage 11 and stops the combustion of the burner 10, Prepare for the next hot water use.

[0007]

In the hot water supply and combustion apparatus of this type, after the hot water supply combustion is stopped, the amount of heat held in the hot water supply heat exchanger 1 is propagated to the hot water in the hot water supply heat exchanger 1. When the hot water temperature of the hot water supply heat exchanger 1 rises and the hot water supply combustion is restarted within a short time after the hot water supply combustion is stopped, the hot water supply set temperature in the hot water supply heat exchanger 1 is set. There is a problem that hot water of an overshoot that is hotter than the hot water flows out, which makes the user of the hot water feel uncomfortable.

In order to solve such a problem, when the hot water temperature detected by the heat exchange side temperature sensor 7 is higher than a predetermined reference temperature, the solenoid valve 5 of the bypass passage 4 is opened to perform hot water supply heat exchange. It is conceivable to mix the hot water from the water heater 1 and the water flowing through the bypass passage 4 to lower the temperature of the hot water from the hot water supply heat exchanger 1 and supply the hot water.

However, the flow rate of the water supplied from the bypass passage 4 per unit time with respect to the overshoot hot water flowing out of the hot water supply heat exchanger 1 is substantially constant regardless of the magnitude of the overshoot. When the amount of overshoot is small, an excessive amount of water is filled, which causes a problem that hot water of an undershoot which is considerably thinner than the set hot water supply temperature occurs, and a case where the amount of overshoot is large. In this case, a sufficient amount of water to eliminate the overshoot cannot be supplied from the bypass passage 4 side, and the amount of water to be filled is insufficient and hot water with an overshoot considerably higher than the hot water supply set temperature is supplied. Therefore, there is a problem that hot water close to the hot water supply set temperature cannot be stably supplied at the time of re-watering.

In particular, as shown by a chain line in FIG. 23, a reheating heat exchanger 16 for reheating a bath is formed integrally with the hot water supply heat exchanger 1, and the reheating heat exchanger 1 and the reheating heat are combined. In the case of a single-can, two-channel hot water supply / burning device in which the exchanger 16 is burned and heated by the common burner 10, when the reheating alone operation is performed, the burner 10 causes the retained hot water supply heat exchanger 1 to operate. When the hot water supply operation is started in such a state, the hot water just before the boiling will be discharged from the hot water supply heat exchanger 1, At this time, even if the electromagnetic valve 5 is opened and water is supplied from the bypass passage 4, there is a problem that the amount of water is insufficient and a considerably high amount of hot water is supplied through the hot water supply passage 3.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a post-boiler after use of hot water supply and a hot water supply heat exchange by reheating alone operation in a single-can, two-channel hot water supply combustion apparatus. To provide a hot water supply combustion apparatus capable of effectively eliminating the post-boiling at the start of hot water supply and supplying a stable hot water temperature substantially at the set hot water supply temperature even when post-boiling occurs in the water heater 1. is there.

[0012]

In order to achieve the above object, the present invention takes the following measures. That is,
The first invention is a hot water supply heat exchanger that heats water supplied from a water supply passage by a combustion flame of a burner to produce hot water and sends the hot water to the hot water supply passage, and the hot water supply passage between the water supply passage and the hot water supply passage. A water supply control bypass passage that bypasses the heat exchanger and communicates with the water supply control bypass passage; a first flow control unit that controls a flow rate on a hot water side where water flowing out of the water supply control bypass passage joins; A second flow rate control means for controlling a flow rate of flowing water, the hot water supply combustion apparatus having a function of detecting after-heating of the hot water supply heat exchanger when the hot water supply combustion is stopped, wherein the hot water supply heat exchanger is used when the hot water supply combustion is stopped A post-boiling elimination standby mode operating unit for operating the valve openings of the first flow control means and the second flow control means to a preset post-boiling elimination standby position when post-boiling is detected; Post-boiling of exchanger The when the hot water supply is started from the state 1
A mixing mode operation unit for controlling the valve opening degree of the flow control means and the second flow control means to control the flow ratio between the hot water flow rate and the flow rate of the water supply control bypass passage in the direction of eliminating post-boiling. A steady operation mode operating section for operating the valve opening of the first flow control means and the second flow control means to a predetermined steady position; and during the mixing mode operation,
When the hot water supply is stopped and no after-boiler is detected in the hot water supply heat exchanger, the above-mentioned steady operation mode operation section is designated to operate the first flow control means and the second flow control means from the mixing operation state to the steady operation. When the post-boil is detected, the post-boil elimination standby mode operation unit is designated to set the first flow control means and the second flow control means from the mixing operation state to the post-boil elimination standby state. And a mode switching control unit for shifting to a state and preparing for the next hot water supply operation.

According to a second aspect of the present invention, there is provided a hot water supply heat exchanger which heats water supplied from a water supply passage by a combustion flame of a burner to produce hot water and sends out the hot water to the hot water supply passage. A water supply control bypass passage which communicates with a bypass of the hot water supply heat exchanger, and a first water supply side flow rate at which water flowing out of the water supply control bypass passage joins;
And a second flow rate control means for controlling a flow rate of water flowing through the water supply control bypass passage, and having a function of detecting a post-boiler of the hot water supply heat exchanger when the hot water supply combustion is stopped. A first flow control means and a second flow control means for detecting after-heating of the hot water supply heat exchanger when the hot water supply combustion is stopped.
A post-boiling elimination standby mode operating section for operating the valve opening of the flow control means to a preset post-boiling elimination standby position; and when hot water supply is started from a state in which the post-boiling occurs in the hot water supply heat exchanger. A mixing mode for controlling a valve opening degree of the first flow control means and the second flow control means to control a flow ratio between the hot water flow rate and the flow rate of the water supply control bypass passage in the direction of eliminating post-boiling. An operating part; a steady operation mode operating part for operating the valve opening of the first flow control means and the second flow control means to a predetermined steady position; and a predetermined mixing during the mixing mode operation. When the end condition is satisfied, the steady-state operation mode operation section is designated, and the first flow control means and the second flow control means are shifted from the mixing operation state to the steady operation state. A mode switching control unit that, when the hot water supply is stopped, designates a post-boil elimination standby mode operation unit and causes the first flow control unit and the second flow control unit to shift from the mixing operation state to the post-boil elimination standby state; The configuration provided as a means for solving the above-mentioned problem.

In the present invention having the above-described structure, for example, when post-boiling occurs in the hot water supply heat exchanger, the first and second flow control means operate the post-boiling elimination standby position by the post-boiling elimination standby mode operating section. Prepare for hot water supply by opening the valve. Then, the valve opening at the boiling elimination stand-by position, that is, the first and second such that the amount of water capable of eliminating the after-boiling from the water supply control bypass passage can be mixed with the hot water from the hot water supply heat exchanger side When hot water is started from the state of the valve opening degree of the flow control means and the post-boiled water flows out of the hot water supply heat exchanger, the post-boiled water that first flows out of the hot water supply heat exchanger is discharged by the water in the water supply control bypass passage. After-boiling is eliminated, and the after-boiling water that has flowed out of the hot water heat exchanger is
The post-boiler is eliminated by the flow ratio control by the mixing operation unit, and hot water having a hot water supply set temperature is supplied almost regardless of the degree of the post-boiler water temperature.

During the mixing operation, when the mixing termination condition is satisfied, the steady-state operation mode operation unit is designated by the mode switching control unit, and the steady-state operation mode operation unit controls the valves of the first and second flow control means. The opening shifts to the steady operation position. As described above, when the mixing is completed, the valve opening degrees of the first and second flow rate control means are shifted to the steady operation position, thereby reliably shifting to the steady operation state where the maximum capacity of the device can be exhibited. It is possible to do.

If the hot water supply is stopped before the mixing end condition is satisfied, the hot water still remains in the hot water supply heat exchanger. Since it is necessary to set the valve opening of the flow rate control means of the above to the post-boiling elimination standby position to prepare for the next hot water supply, the mode switching control unit specifies the post-boiling elimination standby mode operation unit, and this post-boiling elimination standby mode operation The valve openings of the first and second flow rate control means are moved to the post-boiling elimination standby position by the section.

As described above, the state of the valve opening of the first and second flow rate control means is switched according to the state of the hot water in the hot water supply heat exchanger. It is possible to accurately control the valve opening.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows an example of a model of a hot water supply combustion apparatus according to the present invention by a schematic configuration. The hot water supply combustion device of the present invention is not only a single-function hot water supply device (water supply device having only a hot water supply function), but also a two-can, two-channel type hot water supply combustion device (a hot water supply heat exchanger and a reheating heat exchanger are provided separately and independently, A combined bath and hot water supply system, in which each heat exchanger is heated and burned by a separate burner, and a one-can, two-channel hot water combustion device (a hot water supply heat exchanger and a reheating heat exchanger are integrated) It is also applied to a combined bath and hot water supply type in which the integrated hot water supply heat exchanger and the reheating heat exchanger are heated and burned by a common burner.

In FIG. 3A, a water supply passage 2 is connected to the inlet side of the hot water supply heat exchanger 1, and a hot water supply passage 3 is connected to the outlet side of the hot water supply heat exchanger 1. Water supply passage 2
A continuous bypass passage 17 that bypasses the hot water supply heat exchanger 1 is connected between the hot water supply passage 3 and the hot water supply passage 3. One end (inlet side) of the water supply control bypass passage 18 is connected to the position, and the hot water supply passage 3
The other end side (outlet side) of the water supply control bypass passage 18 is communicatively connected to a position D downstream of a connection portion C with the constant bypass passage 17.

The first flow rate control means GM variably controls the flow rate of hot water mixed with hot water exiting the hot water supply heat exchanger 1 and water passing through the bypass passage 17 between the CDs of the hot water supply passage 3.
₁ is provided, also, the water supply control bypass passage 18, the second flow control means GM ₂ is provided with variable control of the flow rate with the possible closure function. These first flow control means GM ₁ second flow rate control means GM ₂ is intended to be constituted by water control means for controlling the valve opening degree, for example, by a gear motor, the first flow control means GM ₁ second The second flow rate control means GM ₂ is provided with a valve opening detection sensor (not shown) such as a Hall IC for detecting a fully open position and a fully closed position of the valve.

The combined flow rate of the hot water of the hot water supply heat exchanger 1 and the water constantly flowing out of the bypass passage 17 is set between the AB of the water supply passage 2 and the hot water side flow Q passing through the first flow control means GM _1.
The first flow sensor FS ₁ to be detected is provided as, also, the water supply passage 2 in the hot water supply passage 3 downstream position than the connecting portion D of the outlet side of the water supply control bypass passage 18
The second flow sensor FS ₂ is provided for detecting the total flow (total flow rate) Q _T to incoming water to. A water supply temperature sensor 6 for detecting a water supply temperature is provided in the water supply passage 2, and a heat exchange side temperature sensor 7 for detecting a temperature of hot water discharged from the hot water supply heat exchanger 1 is provided on an output side of the hot water supply heat exchanger 1. A heat exchange auxiliary temperature sensor 22 for detecting the temperature of the hot water in the heat exchange at an intermediate position (for example, an intermediate portion) of the water pipe passage of the hot water supply heat exchanger 1 as necessary.
Is provided. In the hot water supply passage 3, a mixed hot water temperature (mixing hot water temperature) of the hot water discharged from the first flow rate control means GM ₁ and the water discharged from the water supply control bypass passage 18 is supplied to the hot water supply temperature T.
A hot water supply temperature sensor 8 that detects a _MIX is provided.

When the hot water supply combustion device is configured as a combined hot water supply device for bath and hot water supply, the water supply control bypass passage 18 is used.
The hot water supply passage 3 is branched from the hot water supply passage 3 on the downstream side of the merging position D, and the hot water supply water is dropped into the bathtub 25 via the reheating circulation circuit 24 on the bath side.

When a hot water supply combustion device is configured as such a combined bath and hot water supply unit, a reheating heat exchanger 16 provided in a reheating circulation circuit 24 is formed independently of the hot water supply heat exchanger 1. Then, the hot water supply heat exchanger 1 and the reheating heat exchanger 16 are configured to be heated by combustion using separate and independent burners, so that a two-can, two-channel water heater is provided, and a chain line in FIG. As shown, the hot water supply heat exchanger 1 and the reheating heat exchanger 16 are integrally formed, and the integrated hot water supply and the reheating heat exchangers 1 and 16 are configured to be burned and heated by a common burner. A single water canal type water heater is formed. In FIG. 3 (a), reference numeral 26 denotes a circulation pump for circulating hot water in the bathtub 25 through the additional heating circulation path 24 to perform additional heating, and 27 designates a hot water when performing hot water filling. The pouring solenoid valve opens the passage 23.

An example of a model of the hot water supply combustion apparatus shown in FIG. 3B is a second flow rate sensor FS ₂ shown in FIG.
Are omitted, and other configurations are the same as those of the model example shown in FIG.

The model example of the hot water supply combustion apparatus shown in FIG. 3 (c) is of a type in which the configuration of the apparatus is simplified, and is provided in the model examples of FIGS. 3 (a) and 3 (b). heat交出side temperature sensor 7, the heat exchanger auxiliary temperature sensor 22, the first omitted and a flow rate sensor FS _1, the total feed water flow rate feedwater control the second flow sensor FS ₂ for detecting a (total hot water flow rate) Water supply passage 2 upstream of the connection portion B of the water bypass passage 18
The configuration is the same as that of the model examples in FIGS. 3A and 3B. The operation of the apparatus of the model example shown in FIG. 3 is controlled by a control device 15, and a remote control 9 is connected to the control device 15 in the same manner as the device shown in FIG.
Heating is performed by the burner 10, and in each of the model examples shown in FIG. 3, the burner 10 controls the gas supply amount to the burner 10 by the opening amount of the proportional valve 14 similarly to the case shown in FIG. Although ten combustion system mechanisms are provided, they are not shown in FIG. 3 and these combustion system mechanisms will be described using the reference numerals given in FIG. 23.

When the hot water supply operation is started in a state where the post-boiled overshoot water is generated in the hot water supply heat exchanger 1 of the hot water supply combustion apparatus of the present embodiment, the burner 10 of the hot water supply heat exchanger 1 is operated. perform combustion heating only by feedforward heat, hot water side through the flow Q _BP and first flow control means GM ₁ water exiting the feedwater control bypass passage 18 to eliminate the boiling hot water after leaving the hot-water supply heat exchanger 1 FIG. 4 shows a block diagram of a first control configuration for performing the flow ratio control. The first control configuration includes an input temperature detector 28, a target flow ratio calculator 30 as a target flow ratio detector, a detected flow ratio calculator 31 as a detected flow ratio detector, and a bypass control flow detector. 32, a hot-water-side flow rate detection unit 33, and a mixing control unit 34.

The first control configuration shown in FIG.
(A) and (b), the input temperature detection unit 28 takes in the hot water temperature T _OUT on the outlet side of the hot water supply heat exchanger 1 detected by the heat exchange side temperature sensor 7, first directly or indirectly the flow rate control means GM ₁ enters water side temperature (temperature of the hot water and water exiting the water and always bypass passage 17 leaving the hot-water supply heat exchanger 1 are mixed) as the input temperature T _K To detect. When the input temperature T _K is directly detected, as shown in FIGS.
The temperature sensor 19 for detecting the input temperature may be provided in the hot water supply passage 3 between the outlet side C of the fuel cell 7 and the inlet of the _first flow rate control means GM1 for detection, but the number of parts of the temperature sensor 19 is reduced. In order to reduce the equipment cost, the input temperature T _K
Is detected indirectly.

The input temperature is detected indirectly by taking in the outlet temperature T _OUT of the hot water supply heat exchanger 1 detected by the heat exchange side temperature sensor 7 of the hot water supply heat exchanger 1 and obtaining the following calculation. .

That is, in the input temperature detecting section 28, the amount of the water supplied through the water supply passage 2 always flows to the hot water supply heat exchanger 1 at the connection point A of the bypass passage 17 and always flows to the bypass passage 17 side. The distribution ratio with the quantity is given in advance. For example, when the distribution ratio on the hot water supply heat exchanger 1 side is m and the distribution ratio on the continuous bypass passage 17 side is n, the input temperature detection unit 28 determines the input temperature T by the following equation (1) given in advance. _{Find K} by calculation.

T _K = T _OUT × m + T _IN × n (1)

In the equation (1), for example, the distribution ratio on the hot water supply heat exchanger 1 side is 70%, and the distribution ratio on the bypass passage side is always 3%.
At 0%, 0.7 is given as the value of m, and 0.3 is given as the value of n. This input temperature detector 2
The information on the input temperature T _K obtained in step 8 is added to the target flow ratio calculating section 30.

[0032] Incidentally, the boil after the hot water supply heat exchanger 1, release heat to heat the flow rate Q is decreased to the hot water supply set point temperature T _SP's than the hot water supply set point temperature T _SP with input temperature T _K of the high temperature The flow rate Q _BP passing through the water supply control bypass passage 18 is equal to the heat absorption heat required to increase from the water supply temperature T _IN to the hot water supply set temperature T _SP . From this thermal equilibrium balance relationship,
The following equation (2) is derived.

Q _BP / Q = (T _K −T _SP ) / (T _SP −T _IN ) (2)

In the equation (2), the flow rate Q on the hot water side at the input temperature T _K and the bypass control flow rate at the feed water temperature T _IN (the feed water flow rate passing through the feed water control bypass passage 18) are mixed to set the hot water set temperature T _SP. Is the balance equation of the calorie balance for achieving the temperature of, and Q _BP / Q on the left side represents the flow rate ratio between the bypass control flow rate Q _BP and the hot water side flow rate Q. In addition, the hot water supply set temperature T _SP and the water supply temperature T _{IN on} the right side of the equation (2) can be regarded as constant values, and the value on the right side is an input temperature that changes depending on the after-boiling temperature in the hot water supply heat exchanger 1. It changes depending on the value of T _K.

That is, by adjusting the flow ratio on the left side to match the value on the right side of the equation (2), which depends on the input temperature T _K that changes depending on the post-boiling temperature of the hot water supply heat exchanger 1, the flow rate Q and the bypass control flow Q temperatures are mixed and _BP should be equal to the hot water set temperature T _SP.

In this embodiment, attention is paid to this point, and (2)
The right side of the equation is defined as a target flow rate ratio W _ST between the bypass control flow rate Q _BP and the hot water side flow rate Q, and the left side of the equation (2) is defined as a detected flow rate ratio W _DE .

W _ST = (T _K −T _SP ) / (T _SP −T _IN ) (3)

W _DE = Q _BP / Q (4)

The target flow ratio calculation unit 30 is given in advance the calculation expression of the target flow ratio W _ST of the above equation (3) as solution data, and the target flow ratio calculation unit 30
An input temperature T _K obtained from 8, in accordance with the water supply and information of the feed water temperature T _IN obtained from the temperature sensor 6, captures information of the hot water supply set point temperature T _SP given by remote control, the equation (3), the target flow rate ratio W _{The ST} is obtained by calculation, and the calculated value is added to the mixing control unit 34.

The hot water flow rate detection unit 33 detects the hot water flow rate Q passing through the first flow rate control means GM ₁ by taking in the sensor output of the first flow rate sensor FS ₁ , and calculates the detected flow rate ratio. Add to part 31. If necessary, the detected value of the hot water side flow rate Q is added to the bypass flow rate control detection unit 32.

In the case of the model shown in FIG. 3 (a), the bypass control flow detecting section 32
_The bypass control flow rate Q _BP is obtained by subtracting Q detected by the _first flow rate sensor FS ₁ from the total flow rate (total flow rate) Q _T detected in ₂ .

Q _BP = Q _T -Q (5)

In the case where the hot water supply combustion device is the model shown in FIG. 3B, the bypass control flow detecting unit 32 obtains the bypass control flow Q _BP according to the solution data. This solution data is given by the following equation (6).
The bypass control flow rate detection unit 32 includes an input temperature T _K applied from the input temperature detection unit 28, a hot water supply temperature T _MIX detected by the hot water supply temperature sensor 8, a water supply temperature T _IN detected by the water supply temperature sensor 6, and the hot water side. The data of the hot water side flow rate Q detected by the flow rate detection section 33 is taken in, the bypass control flow rate Q _BP is calculated by the above equation (6), and the calculation result is added to the detected flow rate calculation section 31.

Q _BP = (T _K −T _IN ) · Q / (T _MIX −T _IN ) (6)

The detected flow ratio calculating section 31 fetches the data of the hot water side flow rate Q obtained by the hot water side flow detecting section 33 and the bypass control flow rate Q _BP obtained by the bypass control flow detecting section 32. In accordance with the equation, a detected flow ratio W _DE between the bypass control flow rate Q _BP and the hot water side flow rate Q is obtained by calculation, and the calculation result is added to the mixing control unit 34.

The mixing control section 34 sets the target flow ratio W
Comparing the _ST and the detected flow rate ratio W _DE, detecting the flow rate ratio W _DE first flow control means GM ₁ and second flow control means GM ₂ the flow rate increase or decrease direction of each other in a direction that matches the target flow rate ratio W _ST The flow rate control is performed so that is in the opposite direction. More specifically, the difference between the target flow ratio W _ST and the detected flow ratio W _DE is determined, and K ₁ , K ₂
As the coefficient (gain), the first flow control means GM ₁ applies the voltages V ₁ obtained by the equation _{V 1 = K 1 (W SP} -W DE), the second flow control means GM ₂ Is V ₂ = K
₂ a voltage V ₂ which is obtained by calculation of (W _SP -W _DE) applying the flow rate control. That is, the target flow rate ratio W _SP and the detected flow rate ratio W _DE and differential voltage of the first flow control means GM ₁ and second addition to the flow control means GM ₂ respectively corresponding to the hot water side flow rate Q and the bypass control flow The flow rates of Q _BP and Q are controlled such that the flow rate of Q _BP increases and decreases in the opposite direction.

More specifically, for example, when the after-boiling in the hot water supply heat exchanger 1 is large, that is, when the input temperature T _K is high, the value of the target flow ratio W _ST is large as is apparent from the above equation (3). In order to increase the detected flow ratio W _DE in order to match the target flow ratio W _ST , that is, to increase Q _BP in the direction as shown in the equation (4).
The Q in the small direction, i.e., the first flow control means GM ₁ in the closing direction, the second control means GM ₂ is controlled in the opening direction.

Then, as the temperature of the post-boiled water in the hot water supply heat exchanger 1 decreases, the temperature of the input temperature T _K decreases.
The target flow ratio W _ST gradually decreases, and accordingly, in order to match the target flow ratio W _ST , the bypass flow control is performed in a direction in which the detected flow ratio gradually decreases, that is, as is apparent from the equation (4). The direction in which the flow rate Q _BP is reduced, the direction in which the hot-water-side flow rate Q is increased, that is, the first flow control means GM ₁ is controlled in the opening direction, and the second flow control means GM ₂ is controlled in the closing direction. It is.

[0049] Figure 5 is boiling post this by mixing control unit 34 first flow control means GM ₁ and second flow control means GM ₂ of the valve opening degree of the state of the hot water supply heat exchanger 1 side of the heat交出Inlet temperature ( have the meanings indicated in high and low relationship between the temperature), as is apparent from this figure, the voltages V ₁ applied to the first flow control means GM ₁ second voltage V ₂ applied to the flow control means GM ₂ is The increasing / decreasing directions are opposite to each other, and the valve opening of the second flow control means gradually increases as the temperature of the post-boiler in the hot water supply heat exchanger 1 increases. flow rate valve opening control means GM ₁ has been shown to be reduced gradually controlled.

FIG. 6 shows a state in which the post-boiler temperature is generated in the hot water supply heat exchanger 1, and the post-boiler temperature T _OUT , the hot water supply temperature T _MIX, and the flow control means GM ₁ , GM when the hot water supply operation is started. _Two
When the hot water supply operation is started, the post-boiled water in the hot water supply heat exchanger 1 is discharged, the temperature gradually increases, and after reaching the peak P, the post-boil temperature gradually increases. Lower. At this time, the first flow control means GM ₁ is tapping temperature of boiling rear is controlled in the closing direction toward the peak,
The second flow control means GM ₂ is controlled in the opening direction, the hot water side flow rate Q is reduced, the bypass control flow rate Q _BP is increased, and the after-boiling is eliminated. In the direction of gradually increasing the flow rate Q on the hot water side,
The bypass control flow rate Q _BP is controlled in a gradually decreasing direction, so that the hot water temperature of the hot water supply temperature T _MIX close to the hot water supply set temperature T _SP is stably supplied without being substantially affected by the change of the after-boiler temperature.

FIG. 7 is a flowchart showing the operation of eliminating post-boiling at the start of hot water supply operation in this embodiment.
When the hot water supply operation is started, the target flow ratio _WST is obtained by calculation in step 101, and then the detected flow ratio _WDE is calculated in step 102.

Next, at step 103, the difference between the target flow ratio W _ST and the detected flow ratio W _DE is obtained, and it is detected whether the difference is positive or negative. When the detected flow rate ratio is larger than the target flow rate ratio, the first flow control means GM ₁ at step 104 in the opening direction, controlling the second flow control means GM ₂ in the closing direction. Conversely, when the detected flow ratio W _DE is smaller than the target flow ratio W _ST , the first flow control means GM ₁ is controlled to close in step 105 and the second flow control means GM ₂ is controlled to open in step 105. I do.
Then, whether it is the cancellation condition which mixing operation of the rear boiling eliminate hot water side flow rate Q and the bypass control flow Q _BP are given in advance in step 106 it is determined, if not reach the release condition, i.e., boiling rear When the hot water is still remaining in the hot water supply heat exchanger 1, the operation from step 101 is repeated, and when the mixing operation release condition (end condition) is reached, that is, after the mixing operation in the hot water supply heat exchanger 1, When the boiling water is almost completely discharged, the second flow rate control means GM
₂ is completely closed, the flow rate control at the start of hot water supply is shifted to the total flow rate control, and the combustion operation is performed in the steady-state combustion control operation based on the proportional control based on the total heat quantity that is the sum of the feedforward heat quantity and the feedback heat quantity. Control.

[0053] In this total water control, the flow rate control means GM ₂ second as above is maintained in the closed state, the hot water side flow rate Q detected by the first flow sensor FS ₁ is the total flow rate Q _T Equal (Q _T = Q), feed forward heat P _{F / F}
Is the theoretical amount of heat required for the flow rate Q to be heated from the feed water temperature T _IN to the hot water supply set temperature T _SP , and P _{F / F} = Q (T _SP −T
_IN ) or considering the thermal efficiency η, P _{F / F}
= Q (T _SP −T _IN ) / η, and the feedback heat amount PF _{/ B} is the difference between the hot water supply temperature T _MIX detected by the hot water supply temperature sensor 8 and the hot water supply set temperature T _SP . Is the amount of heat required to eliminate (cancel) P P _{/ B} = Q · K (T _SP −T _MIX ) (where K is a coefficient (gain)) or by taking thermal efficiency η into account.
_{F / B} = Q · K (T _SP −T _MIX ) / η

A detailed description of the conditions for canceling the mixing operation for eliminating post-boil will be described later.

According to the first control configuration of the flow rate control, at the start of the hot water supply operation for eliminating the post-boiled hot water in the hot water supply heat exchanger 1, the supply water temperature of the supply water flow rate Q is set to the hot water supply set temperature T.
Since heat the hot water supply heat exchanger 1 only by the feedforward quantity of heat to increase in the _SP, the enter new from the water supply passage 2 to the hot-water supply heat exchanger 1 water becomes to be heated in hot water of the hot water supply set point temperature T _SP, also hot water The temperature of the post-boiled water generated in the heat exchanger 1 is detected by the heat exchange side temperature sensor 7 as soon as it exits the hot water supply heat exchanger ₁ and the input temperature to enter the first flow control means GM1. T _K is detected, and Yugawa flow rate Q and the bypass control flow Q _BP in a direction corresponding to the target flow rate ratio W _ST with hot water side flow rate Q and the bypass control flow Q _BP for the input temperature is hot water set temperature since the detection flow ratio W _DE of is controlled, irrespective of the boil after the hot water supply heat exchanger 1 temperature, the mixing ratio of hot water so that the flow rate Q of the hot water side is the hot water supply set point temperature T _SP is Controlled to eliminate the effects of post-boiling in the hot water supply heat exchanger 1 , The hot water close to the hot water set temperature can provide the revolutionary effect that can be stably hot water.

When the post-boiled hot water in the hot water supply heat exchanger 1 is discharged, if the variable control of the amount of gas supplied to the burner 10 is performed according to, for example, the hot water supply detection temperature T _MIX , the temperature of the post-boiler becomes After the start of hot water supply, since this is an unstable transient phenomenon that changes with the lapse of time, by performing variable control of the gas amount, on the contrary, there occurs a problem that the hot water temperature fluctuates, or Since the amount of heating heat of the water newly entering the hot water supply heat exchanger 1 is insufficient because the gas amount has been reduced in order to eliminate the temperature of the hot water after the boiling, after the temperature of the hot water after the boiling has been completed, the temperature of the hot water is set higher. However, there is a possibility that a low-temperature undershoot hot water may come out. However, as shown in this embodiment, when the post-boiled hot water in the hot water supply heat exchanger 1 comes out, only the amount of heat of the feed forward is used. The hot water supply heat exchanger 1 is inexpensive The post-boiled hot water generated in the hot water supply heat exchanger 1 by heating with a fixed amount of heat is eliminated by the flow rate ratio control described above, so that the post-boiled hot water in the hot water supply heat exchanger 1 is effectively used. Hot water with a stable hot water supply set temperature can be supplied, and even after the post-boiled water has been discharged, the flow ratio control based on the feed forward heat amount and the proportional control using the feed forward heat amount and the feedback heat amount together perform the total control. The flow can be smoothly shifted to the control of the flow rate, and even when switching from the flow rate ratio control to the total flow rate control, it is possible to obtain the effect that hot water can be supplied at a set hot water supply temperature that does not cause fluctuations in the hot water temperature.

Further, in the flow ratio control, the first
Because of the flow control means GM ₁ and second flow control means GM ₂ increasing and decreasing directions of flow are controlled in the opposite direction, it is assumed that the response of the flow rate ratio variable is extremely excellent, the change in the rear boiling hot water temperature The flow ratio control that quickly follows can be achieved, and thereby the control accuracy of the hot water temperature stabilization at the time of hot water supply of the post-boiled hot water is remarkably improved, and the reliable hot water temperature stabilization control becomes possible. In particular, in the case of a one-can-two-water-path type hot water supply combustion device, for example, when the reheating of the bath is performed alone, the hot water in the hot water supply heat exchanger 1 stays in the burner. In the extreme case, the heating of 10 causes heating to a high temperature just before boiling, but also in this case, when the hot water supply operation is started, the flow ratio control with the quick response is performed, and down first flow control means GM _first valve through the hot water of the Is, by the second flow rate control means GM ₂ is controlled to the fully open direction, even if tapping is high temperature hot water boiling verge from the hot water supply heat exchanger 1, and the hot water of the hot water supply set temperature by the flow rate ratio control hot water Therefore, it is possible to exhibit excellent performance in terms of safety.

Also, in the present embodiment, during the mixing operation for eliminating the boiling water temperature after flowing out of the hot water supply heat exchanger 1, the feedforward heat quantity relative to the hot water side flow rate Q (the flow rate Q is changed from the water supply temperature T _IN to the hot water supply set temperature). T _SP required to increase the is to provide a theoretical heat), a feed-forward heat for this flow rate Q is feed water feed-forward heat (total flow rate Q _T temperature to the total flow rate Q _T T
Theoretical amount of heat required to increase the hot water supply set point temperature T _SP from _IN)
Is smaller than becomes a heat shortage less than the required amount of heat to the total flow rate Q _T to the hot water set temperature after the rear boiling hot water has finished out of the hot water supply heat exchanger 1, Therefore, the second flow rate control means As a result of the operation of the GM ₂ in the closing direction to close the water supply control bypass passage 18, when the temperature of the post-boiled water in the hot water supply heat exchanger 1 is eliminated, the flow is quickly shifted from the flow ratio control by mixing to the total flow control. can do.

Moreover, when the second flow rate control means GM ₂ is closed, the hot water side flow rate Q matches the total flow rate Q _T , so that the feed forward heat quantity with respect to the flow rate Q and the feed forward heat quantity with respect to the total flow rate Q _T are different. Equal,
Almost no change of the feed-forward amount of heat when the second flow control means GM ₂ is switched from the open to the closed, thereby, the total flow rate control steady operation from the flow rate ratio control by mixing without variation of the hot water supply temperature occurs It is possible to make the transition smoothly while keeping the temperature of the hot water stable.

[0060] In contrast, when given a feed-forward heat to the total flow rate Q _T during mixing operation of the rear boiling eliminated, because the amount of heat is large to give, finished out hot water boil rear from the hot water supply heat exchanger 1 also, the second flow control means GM ₂ is not in the closing direction of the operation, there is a problem that can not be quickly transition from the flow ratio control to the total flow rate control, also,
When the flow rate through the hot water supply heat exchanger 1 is small, this small flow rate is heated by a large amount of feedforward heat, causing a problem such as a danger of boiling. However, in the present embodiment, the mixing is performed during the mixing operation as described above. Flow Q
Since the combustion heating is performed by the feedforward heat amount (with a smaller heat amount), the occurrence of the above-described problem can be effectively solved.

FIG. 8 shows a second control configuration of the flow ratio control in this embodiment. In the second control configuration, when the hot water at the input temperature T _K is mixed with the bypass control flow rate Q _BP , the mixing temperature is changed to the hot water side flow rate Q _BP.
Is calculated as the detected temperature T _MIX by the information of the total flow rate Q _T and the flow rate ratio between the hot water flow rate Q and the bypass control flow rate Q _{BP in} a direction in which the detected hot water supply temperature T _MIX matches the hot water supply set temperature T _SP. The input temperature detector 2
8, a hot water temperature calculating unit 35 as a hot water temperature detecting unit,
And a mixing control unit 34.

The input temperature detector 28 has the same configuration as the input temperature detector of the first control configuration shown in FIG. 4, and detects the input temperature T _K directly or indirectly.
The detected value is added to the hot water supply temperature calculator 35.

The hot water supply temperature calculating section 35 is provided with the following equation (7) as solution data. This arithmetic expression is also obtained by the relation of the calorific balance.

T _MIX = ｛(T _K −T _IN ) · Q / Q _T ｝ + T _IN (7)

The hot water supply temperature calculating section 35 has an input temperature T _K applied from the input temperature detecting section 28, a water supply temperature T _IN detected by the water supply temperature sensor 6, and a hot water side detected by the _first flow rate sensor FS1. and the flow rate Q, captures the data of the total flow rate Q _T detected by the second flow sensor FS _2, (7)
The hot water supply temperature T _MIX is calculated according to the equation, and the obtained hot water supply temperature T _MIX is supplied to the mixing control unit 34.

The mixing control section 34 sets the hot water supply set temperature T _SP applied from a remote controller or the like as a target temperature, and sets the hot water supply temperature T _MIX obtained by calculation in the direction corresponding to the target temperature T _SP to the first flow control means GM _1. And the second flow control means GM ₂
Are controlled so that the directions of increase and decrease of the flow rates are opposite to each other.

More specifically, the difference between the set hot water supply temperature T _SP and the calculated hot water supply temperature T _MIX is obtained, and the first flow rate control means GM ₁ gives V ₁ = K ₁ d (T _SP −T applying a voltages V ₁ which is obtained by calculation of the _MIX), also the voltage V ₂ which is obtained by calculation of V ₂ = K ₂ e (T _SP -T _MIX) is applied to the second flow control means GM _2, the The first flow control means GM ₁ and the second flow control means GM ₁
To control the opening and closing direction opposite to each other flow control means GM ₂ of. K ₁ and K ₂ are coefficients (gains) obtained in advance through experiments and the like.

Also in the case of the second control configuration, similarly to the first control configuration, during the mixing operation for eliminating the post-boiled hot water temperature in the hot water supply heat exchanger 1, the feed water is supplied to the hot water supply heat exchanger 1. This is performed by giving only the forward heat amount P _{F / F.}

When the after-boiler temperature in the hot water supply heat exchanger 1 is high, that is, when the input temperature T _K is high, the first flow rate control means GM ₁ moves in the closing direction by the mixing control section 34 to the second direction. flow control means GM ₂ are controlled respectively in the opening direction, as the temperature of boiling rear is reduced, the first flow control means GM ₁ in the opening direction, the second flow rate control means GM ₂
Are controlled in the closing direction, respectively, to eliminate post-boiling. Thus, the first flow control means GM ₁ and the increase or decrease direction of the second flow control means GM ₂ flow together opposite to the direction that matches the hot water detected temperature T _MIX hot water supply set point temperature T _SP of the target temperature The flow ratio between the hot water side flow rate Q and the bypass control flow rate Q _BP is controlled so as to achieve high accuracy and high reliability as in the case of the first control configuration shown in FIG. Hot water and water mixing control for eliminating post-boiling is achieved,
It is possible to provide an effect that hot water having a set hot water supply temperature can be supplied irrespective of the after-boil temperature.

FIG. 9 shows a third control configuration of the flow ratio control in this embodiment. This control configuration is a simple configuration corresponding to the model example shown in FIG. 3C. The hot water supply temperature T _MIX is actually measured by the hot water supply temperature sensor 8, and the actually measured hot water supply temperature T _MIX and the remote control are used. The mixing control unit 34 compares the set hot water supply set temperature T _SP with the set hot water supply set temperature T _SP at the target temperature, and compares the measured hot water supply temperature T _SP with the set hot water supply set temperature T _SP.
First flow control means in a direction to match the _MIX GM ₁ and second
Flow control means GM ₂ increasing and decreasing directions of the flow rate is to control the direction in which the opposite direction to each other. The control operation of the mixing control unit 34 in the third control configuration is the same as the operation of the mixing control unit 34 shown in FIG. This third control configuration is different from the second control configuration shown in FIG. 8 in that the hot water supply temperature T _MIX is measured without being calculated, and otherwise the same as the operation of the second control configuration. .

This third control configuration is based on the measured hot water supply temperature T
_MIX and hot water supply set temperature T _SP
The flow control means GM ₁ is intended to perform a second control of the flow control means GM _2, wherein the second control arrangement of the input temperature detector 28 and the first and the flow sensor FS _1, heat交出side temperature Since the sensor 7 can be omitted, the device configuration can be simplified. Thus, despite the simplified apparatus configuration, the measured hot-water supply temperature T Yugawa the _MIX in a direction that matches the hot water supply set point temperature T _SP, which is the target temperature flow rate Q and the bypass control flow Q
The flow ratio control of _BP since the first flow rate control means GM ₁ and increasing or decreasing direction of the second flow control means GM ₂ flow performed by controlling so that the opposite, boiling hot water supply heat exchanger 1 even the high-temperature water in the verge is caused by boiling the rear, that first flow control means GM ₁ is in the closing direction (squeezing direction), the second flow control means GM ₂ is controlled to the fully open direction, water By mixing the side flow rate Q and the bypass control flow rate Q _BP , hot water having a temperature substantially equal to the hot water supply set temperature T _SP can be produced, and the hot water can be stably supplied. The advantage is that an inexpensive hot water supply combustion apparatus having high performance and high accuracy in stabilizing the hot water temperature can be obtained.

FIG. 10 shows still another example of the model to which the flow ratio control of this embodiment is applied (in this example, the illustration of the reheating heat exchanger 16 is omitted). In the hot water supply combustion device shown in (1), the flow rate sensor FS _BP for directly detecting the bypass control flow rate is provided directly in the water supply control bypass passage 18, so that the flow rate sensor FS _BP directly detects the bypass control flow rate Q _BP ,
The second flow sensor F hot water side flow rate Q is to detect the total flow rate Q _T
A flow ratio control operation by the first and second control configurations is obtained by calculating by subtracting the bypass control flow rate Q _BP detected by the flow rate sensor FS _BP from the detected flow rate Q _{T of} S _2. is there.

In each control configuration of the flow ratio control,
Although the constant bypass passage 17 bypassing the hot water supply heat exchanger 1 is provided, the constant bypass passage 17 may be omitted. In this case, the input temperature T _K of the flow rate Q entering the first flow rate control means GM ₁ coincides with the detected temperature T _OUT of the heat exchange side temperature sensor 7, so that the value of T _OUT is used instead of T _K. By performing the arithmetic processing using the above, the control operations of the first and second control configurations can be similarly performed.

Further, in the above examples of the hot water supply and combustion devices of the respective models, one continuous bypass passage 17 is provided, but a plurality of continuous bypass passages 17 may be provided.

[0075] In this embodiment, as described above, when the rear boiling has started the hot water supply from being a state which the hot water supply heat exchanger 1, the first flow control means GM ₁ and second flow rate to eliminate the boiling rear by controlling the valve opening degree of the control means GM _2, and a control arrangement which is capable of hot water a stable hot water about the hot water set temperature. The present embodiment is characterized in that the following mode switching control configuration is provided in addition to the flow ratio control configuration for eliminating boiling thereafter. Hereinafter, a control configuration of the mode switching control unit which is characteristic in the present embodiment will be described.

In this embodiment, in order to effectively perform the hot water temperature stabilization control by controlling the flow ratio of the post-boiled hot water temperature, the hot water supply operation is started from the state before the start of the hot water supply operation and the steady operation state is started. Are divided into four operation modes,
The first flow control means GM at each of the classification mode positions
₁ and second to define the operating state of the flow control means GM _2, the operating state of the hot-water supply operation has a configuration for switching the operation mode for each to clear the previously given conditions.

FIG. 1 is a block diagram showing the operation modes of the flow rate control means GM ₁ and GM ₂ and their switching control, which are characteristic in this embodiment. The mode switching control section 36 includes a post-boiling elimination standby mode. An operation unit 37, a steady operation mode operation unit 38, a mixing mode operation unit 40,
An operation-off mode operation section 41 is provided.

In this embodiment, the flow rate control means GM ₁ ,
The operation modes of the GM ₂ are classified into four modes: a post-boiling eliminating standby mode of mode 1, a steady operation mode of mode 2, a mixing mode of mode 3, and an operation off mode of mode 4. The operation in mode 1 is performed by the post-boiling elimination standby mode operation unit 37, the operation in mode 2 is performed by the steady operation mode operation unit 38, the operation in mode 3 is performed by the mixing mode operation unit 40, and the operation in mode 4 Are performed by the operation-off mode operation unit 41, respectively.

The mode 1 is a flow control means G before hot water supply combustion in a state in which hot water is generated in the hot water supply heat exchanger 1.
M ₁ and GM ₂ are the operations. In the operation of mode 1, after the hot water supply operation is started, the hot water from the hot water supply heat exchanger 1 is immediately removed from the bypass passages 17 and 18 to the hot water. To prepare for the supply of water, for example,
The ratio of hot-water supply heat exchanger side flow rate Q _H and the bypasses 17 side flow rate Q _W is Q _H: Q _W = 30: with 70 to become such a valve opening degree is so as to stand, the hot water supply heat exchanger Even if the maximum peak post-boiler water temperature that can occur within 1 is generated, the system waits at a predetermined valve opening that can be filled with hot water at the hot water supply set temperature.

The operation in mode 1 is performed under the operating conditions of the hot water supply combustion apparatus in which it is determined that hot water is generated in the hot water supply heat exchanger 1. In the example, the following five conditions are given. The first condition is that, in the case of a combined canister with one can and two water channels, the hot water supply is stopped in a state of simultaneous reheating of the bath and the hot water supply, and in this case, the hot water supply is stopped. Since the reheating combustion is continued, the retained hot water in the hot water supply heat exchanger 1 is heated by the reburning burner combustion to be in a post-boiling state, so that the mode 1 operation is performed.

The second condition is when the reheating of the bath is started in a state where the hot water supply is stopped in the case of the combined water heater of one can and two water channels. Also at this time, the water staying in the hot-water supply heat exchanger 1 is heated by the reheating combustion and is brought into a post-boiling state, so that the mode 1 operation is performed.

The third condition is that when the operation switch is turned on, the heat exchange side temperature sensor 7 and the heat exchange auxiliary temperature sensor 22
At least one of the temperatures is equal to or higher than the temperature determined as the after-boiling temperature (for example, 50 ° C.). The fourth condition is
In the previous hot water supply combustion operation, the hot water side flow rate Q and the bypass control flow rate Q _BP are operated in a mixing control state by the flow rate ratio control for eliminating the post-boiled hot water temperature, and the total flow rate Q _T and the hot water flow rate are controlled. This is when the hot water supply is stopped before the difference from the side flow rate Q reaches the predetermined mixing end determination flow rate. 5
The third condition is given in advance when the previous hot water supply operation is in a state where the hot water side flow rate Q and the bypass control flow rate Q _BP are mixed by the flow rate control for eliminating boiling after the above-described hot water supply and hot water is supplied. When the hot water supply is stopped before reaching the mixing allowable time.

When the hot water is supplied by mixing the hot water side flow rate Q and the bypass control flow rate Q _BP passing through the water supply control bypass passage 18 by the flow ratio control for eliminating the post-boiling, as the post-boiling temperature decreases, First flow control means G
Valve opening degree of the M ₁ is controlled in the direction of increase, the second valve opening of the flow control means GM ₂ is controlled in a direction gradually decreases, the second flow rate control means GM _second valve is closed Before the mixing state is stabilized, the second flow control means GM
A phenomenon in which the hot water supply operation is continued to the end with the _second valve open may occur.

When such a phenomenon occurs, the required combustion heat quantity becomes a predetermined maximum combustion heat quantity (the opening degree of the proportional valve is maximum) from the flow rate control in which the stabilization of the tapping water temperature is given top priority. You can not change to the adjusting to take total flow controls the first valve opening of the flow control means GM ₁ in the opening direction, and that it becomes impossible to exhibit the maximum capability of the water heater combustion device occurs Become.

Further, if the valve of the second flow control means GM ₂ is kept open, the flow rate of water flowing through the hot water supply heat exchanger 1 is reduced by the amount of water flowing through the water supply control bypass passage 18. The temperature of the hot water in the exchanger 1 may be in a boiling state, which is extremely dangerous. Further, when the hot water supply heat exchanger 1 has a function of stopping the hot water supply combustion when the hot water temperature in the hot water supply heat exchanger 1 becomes a boiling state, when the inside of the hot water supply heat exchanger 1 becomes a boiling state as described above. In addition, there arises a problem that the hot water supply combustion is stopped by activating the above function and the hot water supply operation is interrupted.

In the present embodiment, in order to prevent these problems, as the mixing proceeds, the flow difference between the total flow rate Q _T and the hot water side flow rate Q is determined as the mixing end determination flow rate (for example, 0.
5 After liters / min) to the margin time providing immediate or advance when it is has passed, so that forcibly closes the second flow control means GM _2.

[0087] Further, in the present embodiment, it is given as a pre-mixing time allowed time ranges performing mixing, and forcibly close the second flow control means GM ₂ when the expiration of the mixing time allowed. Before the difference between the mixing total flow rate Q _T and the hot water side flow rate Q reaches the mixing end determination flow rate and before the mixing allowable time has elapsed, it is assumed that the post-boiled water is still generated in the hot water supply heat exchanger 1. When the hot water supply is stopped in such a state, the first flow rate control means GM ₁ and the second flow rate control means GM ₁ can be used in preparation for re-heating of the post-boiled hot water generated in the hot water supply heat exchanger 1. control means GM ₂ in the state of the valve opening degree of the mode 1 and is to wait for the next hot water supply operation. When any one of the above five conditions is satisfied, it is determined that the hot water in the hot water supply heat exchanger 1 is after-boiling, and the flow control means GM ₁ and GM ₂ perform the mode 1 Operation state.

[0088] Mode 2 is an operation in which the second flow control means GM ₂ becomes a closed state. The first case in which the operation of mode 2 is performed is a steady operation of hot water supply. In the second case in which the mode 2 operation is performed, the outlet temperature T _{OUT of the} hot water supply heat exchanger 1 detected by the heat exchange side temperature sensor 7 during standby before the start of the hot water supply operation or the heat exchange assistance This is when the temperature T _Z1 in the heat exchange detected by the temperature sensor 22 is lower than the post-boiling determination temperature (for example, 50 ° C.). At this time, even if the hot water supply is started, it is determined that there is almost no effect of the after-heating, and in this case, the hot water supply in the cold start state (after the hot water supply is stopped,
Like the state) hot-water supply operation is started in a state where a long time has cooled hot water supply heat exchanger 1 has elapsed treatment comprises a hot water supply operation in a state of closing the second flow control means GM _2.

Further, in the case of a one-can-two-water channel type combined water heater, the heat exchange side temperature sensor 7 and the heat exchange auxiliary temperature sensor 2
2, when one or both of the detected temperatures is lower than the reference temperature, when the hot water supply is operated alone, when the hot water supply is stopped, and after the reheating operation of the bath, the post pump (circulation pump of the bath after the reheating is completed) Is continuously driven to circulate the hot water in the bathtub through the additional heating circulation path 24 without burning the burner, for example, after one minute has elapsed, the mode 2 operation is adopted. This is because, in the one-can-two-water channel type combined water heater, even after the hot water supply is burned alone and then stopped, the hot water supply heat exchanger 1
The heat on the hot water side is radiated to the water pipe on the bath side, so the hot water supply heat exchanger 1
After the operation of the post-pump after the bath is heated, for example, when one minute has elapsed, the hot-water supply heat exchanger 1 heated by the reheating of the bath has a small influence of the post-boiling inside the bath.
Since boiling of the heat effect of the boil rear are released into the circulation flow of the bath side circulating by post pump after the inner is reduced, following the operation of the mode 2, in a closed and the second flow controlling means GM ₂ In preparation for hot water supply combustion. of course,
Before the set time elapses after the start of the post pump, the heat exchange side temperature sensor 7 and the heat exchange auxiliary temperature sensor 22
When one or both of the detected hot water temperatures falls below the post-boiling determination temperature, the operation of mode 2 may be adopted.

In the present embodiment, during the operation in mode 2, the second flow control means GM ₂ is in the closed state, and the flow rate Q _H passing through the hot water supply heat exchanger 1 and passing through the bypass passage 17. flow rate Q _W ratio between the 70:30 (Q _H: Q _W =
70:30).

Mode 3 is an operation for performing control by mixing the hot water side flow rate Q and the bypass control flow rate Q _BP passing through the water supply control bypass passage 18 by the flow rate ratio control for eliminating the after-boiling described above. The operation 3 is an operation to be performed by starting the hot water supply operation in the standby state after the boiling in the mode 1.

Mode 4 is an operation to be performed when the operation is turned off in the state of each of the above-mentioned modes ₁ to 3. In the operation of mode 4, the first flow control means GM1 and the second flow control an operation to both the reference position of the valve means GM _2,
In this embodiment, the fully open position is set as the reference position,
It is fully open position when a operating condition of the first flow control means GM ₁ and second flow control means GM ₂ the mode 4.

The mode switching control unit 36 includes a bath-on signal (boil-on signal), a bath-off signal (bake-off signal), a hot water supply on signal, a hot water supply off signal, an operation on signal,
Run-off signal, running water on signal (on signal of running water detection applied from flow sensor or running water switch, etc.), running water off signal, boiling signal (bath boiling signal), pushing operation end signal described later, T _OUT , T _Z1, Q, and the signal is applied, such as Q _T, the mode switching control unit 36 against the various types of information in advance the input and operating conditions for each mode given in the internal memory, the operation mode Switch control.

The flow of the switching of the mode operation will be briefly described with reference to FIG.
All operations are in mode 4 and the first flow control means GM ₁
When the second flow rate control means GM ₂ is set to the fully open position the valve opening is the reference position. The mode switching control unit 36 incorporates after-boiling detecting means (not shown). The after-boiling detecting means takes in the heat-exchange-side temperature sensor 7 and the detection information of the heat-exchange auxiliary temperature, and detects these sensors. , 22 are determined to be equal to or higher than the post-boiling judgment temperature, and T _OUT
At least one of T _Z1 is determined that when more than the rear boiling determination temperature at which there is hot water boil rear to the hot water supply heat exchanger 1 has a structure for detecting the boiling rear and.

When the operation ON signal is input in the mode 4 described above, the hot water supply heat exchanger 1
When the after-boiling is detected, the mode switching control unit 36 switches the operation from the mode 4 to the mode 1 and the flow control means GM ₁ , G with the valve opening for eliminating the after-boiling.
To wait for the M _2. When both T _OUT and T _Z1 are lower than the after-boiling judgment temperature, the operation is switched from the mode 4 to the mode 2 to prepare for the start of hot water supply with the second flow control means GM ₂ fully closed.

When the hot water supply is started in the operation state of the mode 1 and the running water is detected to be on, the operation mode is switched from the mode 1 to the mode 3 and the hot water side flow rate Q and the water supply control bypass are controlled by the flow rate ratio control described above. Mixing control with the bypass control flow rate Q _BP passing through the passage 18 is performed, and the valve opening of the flow rate control means GM ₁ , GM ₂ is controlled so as to eliminate post-boiling.

When the hot water supply is stopped during the mixing operation in mode 3 and running water off is detected, it is determined that post-boiled hot water is still present in hot water supply heat exchanger 1, and
The operation is switched from mode 3 to mode 1 to prepare for the next hot water supply. During the mixing operation in mode 3, when it is determined that the mixing termination condition described later is satisfied and the influence of the boiling is almost eliminated, and when the mixing operation ends, the operation mode is switched from mode 3 to mode 2, and the flow control means GM ₂ shifts to the steady operation of the total flow rate control from to the flow ratio control in the fully closed state to continue the hot water supply operation.

By the way, if the mode is always switched from the mode 3 to the mode 2, the mode is switched from the mode 3 to the mode 2 even when the hot water supply is stopped while the post-boiled hot water remains in the hot water supply heat exchanger 1. is, in this embodiment, since the second flow control means GM ₂ would be closed, the second flow control means GM ₂ at the beginning the next hot water is closed state, from a state where the rear boiling is remaining When the hot water supply is started, water cannot be added to the boiling water thereafter from the water supply control bypass passage 18, and there is a problem that hot water with an overshoot higher than the set hot water supply temperature flows out.

On the other hand, in the present embodiment, since the above-mentioned characteristic mode switching control is provided,
When the hot water supply is stopped while the hot water is still remaining in the hot water supply heat exchanger 1, the mode is switched from the mode 3 to the mode 1, and the first flow rate control means is determined based on the valve opening at the post-boiling elimination standby position. Since the GM ₁ and the second flow control means GM ₂ are on standby, the above problem can be avoided reliably. In other cases, that is, when the mixing end condition is satisfied during the operation of mode 3, that is,
When the influence of the after-boiling is almost eliminated, the mode is switched from the mode 3 to the mode 2, so that the flow rate control can be switched to the total flow rate control, and the combustion operation capable of exerting the maximum capacity of the apparatus can be performed. .

There are two modes of operation, that is, an operation during a hot water supply operation in a steady state and a standby operation in a cold start state before the start of hot water supply. When the reheating of the bath is started in the hot water supply standby state or when the reheating of the bath is being performed simultaneously with the steady operation of the hot water supply, the hot water supply operation is stopped and the reheating of the bath continues. In this case, reheating is performed in the hot water supply stopped state, so that after-heating in the hot water supply heat exchanger 1 occurs. In this case, the operation mode is switched from mode 2 to mode 1 to start the next hot water supply. Be provided. In any of the modes 1 to 3, when the operation-off signal is input, the operation shifts to the operation of the mode 4, and the flow control means GM ₁ and GM ₂ set the valve opening to the fully open position. .

As described above, in this embodiment, when the operation switch is turned off, the first flow control means GM ₁ must be used.
When the second valve opening of the flow control means GM ₂ is set to the valve opening degree of the reference position, is shifted to the operation of each mode 1-3 from this set state, the control valve opening to suit each mode of operation With this configuration, the control position of the valve opening does not shift with time, and the control of the valve opening can be performed reliably and accurately.

FIG. 11 shows a configuration of the closing control of the second flow control means GM ₂ at the end of the mixing operation in the mode 3, wherein the flow comparing section 42 and the GM ₂ controlling section 4
3 and a data memory 44. During the mixing operation by the flow ratio control in the mode 3, the flow rate comparing section 42 always takes in the total flow rate Q _T and the hot water side flow rate Q and compares them to obtain a difference Q _T −Q = ΔQ.
Add Q data to GM ₂ controller 43. GM ₂ control unit 4
3 compares the mixing end determination flow rate (for example, 0.5 liter / min) stored in advance in the data memory 44 with the flow rate difference ΔQ obtained by the flow rate comparison unit 42,
When the flow rate difference ΔQ becomes equal to or less than the mixing end determination flow rate, it is determined that the post-boiled water in the hot water supply heat exchanger 1 has almost completely exited. In this case, the second flow rate control means GM
_{To 2} operating state is remains open to prevent from being stabilized, GM ₂ control unit 43 closes the second flow control means GM _2.

[0103] Further, the data in the memory 44 are stored in the value of the mixing time allowed, for example, 50 seconds to allow the operation of the mixing, GM ₂ controller 43, the mixing operation mode 3 exceeds the mixing allowable time when the can is closed and the second flow controlling means GM ₂ as well.

The mixing allowable time is given with some allowance for the time when the post-boil is completed in consideration of the internal volume of the hot water supply heat exchanger 1 and the like, and the mixing operation is not completed within the mixing allowable time. It is estimated that some malfunction is occurring in, and boiling due after the second flow control means GM ₂ inside the hot water supply heat exchanger 1 be closed is eliminated when the mixing permissible time has elapsed Therefore, there is no problem. For this reason, in the present embodiment, when the mixing operation is not completed within the allowable mixing time, the mixing operation is forcibly ended when the allowable mixing time has elapsed, and the flow rate ratio control is performed. It shifts to control.

As described above, in this embodiment, the mode 3
And when the difference between the hot water side flow rate Q is below the mixing end determination flow configuration with respect to the total flow rate Q _T during operation of conditions as when the operating time of the mode 3 has reached the mixing time allowed for setting the mixing This is given as a mixing end condition for terminating.

Next, a more improved control structure for terminating the mode 3 mixing operation will be described. Improved configuration of the first stage may store a value of the mixing termination prohibition time (e.g. 8 seconds) in the data memory 44, GM ₂ controller 4
3, the total flow rate Q _T and hot water side flow rate ΔQ of the difference between the flow rate Q without immediately closing the second flow control means GM ₂ even when the mixing end judgment flow rate determined by the flow rate comparison unit 42, the when ΔQ is standing by in a status of not second closure of the flow control means GM ₂ to further mixing completion prohibition time elapses from the time of equal to or less than a mixing completion judgment flow, it elapses the mixing terminated prohibition time 2
In which of a structure to perform the closure of the flow control means GM _2.

As described above, by giving the mixing end prohibition time, the following effects can be obtained. That is, when the hot water supply flow rate of the hot water supply combustion device is small, when hot water supply is started in a state where post-boiling occurs in the hot water supply heat exchanger 1, as shown in FIG. The time from when the boiling water first comes out of the vessel 1 starts to be discharged to the time when the peak temperature of the boiling is detected by the heat-exchange-side temperature sensor 7 becomes longer, and the boiling water starts flowing out of the hot water supply heat exchanger 1. When the post-boiler temperature is detected by the heat exchange side temperature sensor 7 at the start of hot water supply, since the post-boiler temperature is relatively low and the lower post-boiler temperature is output for a relatively long time. The first flow control means is controlled in the closing direction, and the second flow control means is controlled in the opening direction.

However, since it takes a long time until the temperature of the post-boil peak comes out from the hot water supply heat exchanger 1, mixing of the hot water side flow Q and the bypass control flow Q _BP due to the first hot water of the post-boil occurs. the difference may become less mixing completion judgment flow, in such a case, immediately second flow control means GM ₂ the closed state of the total flow rate Q _T and hot water side flow rate Q before the peak of the boiling rear exits by If this is done, hot water having the hot water temperature of the post-boiler peak will come out later, and there is a possibility that the mixing operation of the hot water of the post-boiler peak may not be performed thereafter, but the mixing end prohibition time is provided. Accordingly, even when the flow rate difference ΔQ is equal to or smaller than the mixing end determination flow, the second flow rate control means GM ₂ becomes possible to continue the state of the mixing operation mode 3 without being closed, its The peak of the boiling post within the post mixing completion prohibition time has hot water from the hot water supply heat exchanger 1,
Correspondingly, the mixing operation by the flow ratio control for filling the post-boil is performed, so that the problem that the mixing of the hot water at the peak of the post-boil cannot be eliminated can be solved.

An improved configuration of the second stage of the mixing end control in this embodiment is provided with a variable inhibition time setting section 46 as shown by a dashed line in FIG. The end prohibition time is variably set.

That is, the prohibition time variable setting section 46 includes:
For example, the relationship data between the flow rate and the mixing end prohibition time, which increases the mixing end prohibition time as the flow rate decreases as shown in FIG. 13, is given in advance. the to water flow rate, in this embodiment takes in detection data of the total flow rate Q _T,
Set the mixing termination prohibition time corresponding to the detected flow rate, and configured to apply the set value to GM ₂ controller 43.

Thus, the GM ₂ control section 43 controls the second flow control means GM ₂ to perform the closing operation by using the mixing end prohibition time set by the prohibition time variable setting section 46.

In the improved configuration of the second stage, the mixing end prohibition time is automatically set according to the flow rate. Therefore, a long useless mixing end prohibition time is given even when the flow rate is large. of or problem that delay unnecessarily the closure timing of the flow rate control means GM _2, the flow control means to prevent the problem that is closed before the peak of the boiling rear by mixing finished prohibition time is too short exits At the optimal timing when the post-boiling peak is over and the post-boiling is eliminated.
The flow control means GM ₂ of the first embodiment is closed, and the transition from the mixing operation of the flow ratio control by the feedforward heat quantity to the steady operation control of the total flow rate by the combined use of the feedforward and the feedback can be performed at the optimal timing. Will be obtained.

FIGS. 14 and 15 show that the flow rate difference Δ
This shows a configuration for indirectly closing the _second flow control means GM2 instead of directly closing it when Q does not become equal to or less than the mixing end determination flow rate. This second
Construction of flow indirect closing of the control means GM ₂ is intended to be configured with a feed-forward heat variably setting unit 47, the feed-forward heat variably setting unit 47 (starting the hot water supply in the subsequent boiling state) mixing starting The elapsed time from the elapsed time has exceeded the mixing allowable time, and is detected in response to a signal from the timer. After the mixing allowable time has elapsed, the feedforward heat amount is changed with time as shown by the solid line in FIG. , Is variably set in a stepwise or continuously decreasing direction as shown by a broken line. Then, the data of the variably set feedforward calorie is added to the combustion control unit 48, and the combustion control unit 48
In order to generate the variably set feedforward heat amount, the burner 10 controls the valve opening drive current to the proportional valve 14.
Combustion.

As described above, the feedforward heat amount is variably set in the decreasing direction, so that the hot water supply combustion heat amount is reduced. As a result, the input temperature T _K is decreased, and the first temperature is controlled by the flow ratio control for eliminating post-boiling as described above. the flow control means GM ₁ is the opening direction, the second flow rate control means GM ₂ are results that are controlled in the closing direction, the difference ΔQ between the total flow rate Q _T and hot water side flow rate Q becomes less mixing completion judgment flow, thereby , it becomes the second flow control means GM ₂ is is securely closed, can transition to a steady combustion operation of the water heater.

In this embodiment, the second flow control means GM
_When closing the valve ₂ , the fully closed position of the _second flow control means GM2 is detected by a sensor such as a Hall IC, and then the valve is pushed in the closing direction to further close the valve. ing.

[0116] Figure 16 shows a control structure of this pushing operation, driving the GM ₂ controller 43 duty changing section 49
Is provided. The drive duty changing section 49 is provided in the Hall I
When the fully closed position detection sensor 50 such as C received a second detection signal in the fully closed position of the flow control means GM _2, changes the duty of the voltage for driving the valve in the closing direction to be lower. For example, when the valve is operated from the open position to the closing direction with a drive voltage of 50% duty, when the detection signal of the fully closed position is applied from the fully closed position detection sensor 50, the duty of the drive voltage is set to 50%. %, For example, variably set to 30%.

The GM ₂ control unit 43 changes the duty set by the drive duty change unit 49 from the time when the fully closed position of the valve is detected for a fixed time (for example, 5 seconds) measured by a timer, as shown in FIG. As shown, the duty of the drive voltage is lowered, and the valve is further pushed in the closing direction to drive.

By pushing the valve in the closing direction,
The valve of the second flow control means GM ₂ is reliably closed,
It is possible to make a transition to the steady-state operation of hot water supply by total flow control in a state where the flow of the leak in the water supply control bypass passage 18 is completely prevented.

As described above, by reducing the duty of the driving voltage,
That, push in the closing direction, the valve is a valve with a torque which can avoid damage to the gear of the second flow control means GM ₂ burnout and gear motor gear motor coil also reduces the driving power of the valve following impact with the valve seat since to carry out the pushing movement in the closing direction after closure, to prevent burnout of the coil of the flow control means GM ₂ Reduction motor, also to prevent the occurrence of breakage of the gear motor gear. That is, even after the valve is driven in the closing direction to reach the fully closed position, if the pushing drive is performed in the closing direction of the valve with the same high driving power, the large driving power is converted into heat energy, and the high heat energy As a result, the coil of the gear motor may be burned out, or the gear may be damaged because a large torque is applied to the gear of the gear motor. However, as in this embodiment, the drive power is reduced to close the valve. Since the push-in drive in the direction is performed, without causing such a problem,
Reliable closing of the valve is achieved.

In this example, as a means for reducing the power of the pushing drive in the closing direction of the valve, the duty is variably set to a low value. Needless to say, other means may be used to reduce the drive power, such as by changing the drive power.

FIG. 18 shows a configuration of control for switching from the operation state of mode 1 to the operation state of mode 2 shown in FIG. In the figure, the mode switching control unit 36 has a temperature comparison unit 51, and this temperature comparison unit 51 exchanges the detected temperature T _OUT of the heat exchange side temperature sensor 7 with the hot water supply heat exchange detected by the heat exchange auxiliary temperature sensor 22. One or both of the detected temperatures T _Z1 of the hot water temperature in the vessel 1 are fetched, and these detected temperatures T _OUT and T _Z1 are compared with a predetermined judgment reference temperature T _TH .

This reference temperature T _TH is determined when the hot water from the hot water supply heat exchanger 1 is mixed with the water passing through the bypass passage 17 and the hot water is discharged from the hot water supply heat exchanger 1 with the _second flow rate control means GM ₂ closed. This means the post-boiling temperature in the hot water supply heat exchanger 1 at which the hot water temperature just reaches the hot water supply setting temperature T _SP , and therefore, as shown in FIG. When the temperature is higher than _TH , when the second flow control means GM ₂ is discharged in a closed state, the hot water supply set temperature T
Become hot water of high overshoot than _SP, conversely, the lower undershoot hot water than hot water supply set point temperature T _SP in case hot water temperature of the hot water supply heat exchanger 1 is less than T _TH. Focusing on this point, in the present embodiment, the temperature comparison unit 51
One or both of _OUT and T _Z1 is compared with a predetermined reference temperature T _TH, and when the detected temperature is lower than the reference temperature T _{TH, the} overshoot water higher than the hot water supply set temperature T _SP. Determines that hot water is not supplied and switches from the operation state of mode 1 to the operation state of mode 2 for preventing overshoot due to post-boiling to prepare for the next hot water supply operation.

Further, in the case of a one-can, two-channel type bath / hot water supply combined system, the mode switching control section 36 outputs a signal indicating that the reheating alone operation has been completed and the operation of the post-pump after boiling has been completed (FIG. When the post-pump end signal is detected, the hot water supplied by the post-pump circulates in the reheating circuit 24 in the fire-extinguishing state of the burner 10 and is heated by the reheating combustion to be in a post-boil state. It is determined that the post-boiling state has been eliminated because the heat in the heat exchanger 1 is absorbed by the circulating bath water, and the mode is switched from the standby state of mode 1 to the standby state of mode 2 in this case as well. Things.

Although the hot water temperature in the hot water supply heat exchanger 1 is lower than the reference temperature T _TH , the operation state of the mode 1 is not satisfied, that is, the second flow control means GM ₂ is opened. In the state (of course, the first flow control means G
M ₁ is also opened), the hot water supply operation is started, after the hot water low hot-water supply heat exchanger 1 than the determination reference temperature T _TH is mixed with water exiting always bypass passage 17, further water supply There is a problem that hot water considerably lower than the hot water supply set temperature T _SP is supplied because the water is mixed with the water flowing out of the control bypass passage 18. However, as in the present embodiment, the hot water supply heat exchanger 1 side has a problem. because when one or both of the hot water temperature T _OUT and T _Z1 is lower than the determination reference temperature T _TH is switched to the second mode of operation which closes the second flow control means GM _2, the hot water of the undershoot The effect that hot water supply can be avoided is obtained. Further, the switching from the operation state of mode 1 to the operation state of mode 2 is performed in consideration of both the hot water side temperature T _OUT of the hot water supply heat exchanger 1 and the substantially middle temperature T _{Z1 of the} hot water supply heat exchanger 1. By doing so, even if the temperature distribution in the hot water supply heat exchanger 1 fluctuates, the information on the post-boiled hot water temperature in the hot water supply heat exchanger 1 can be detected more reliably, so that the mode operation is switched. Control accuracy can be improved.

FIG. 20 shows a switching configuration of the combustion control from the mixing operation in the mode 3 shown in FIG. 2 to the steady hot water supply operation in the mode 2. The control unit 48 performs a combustion control at the time of the mode 3 mixing operation.
And a total flow rate combustion control unit 54 for controlling the combustion in the steady operation in the mode 2. The flow ratio combustion control unit 53 calculates a feedforward heat amount P _{F / F} required to increase the hot water side flow rate Q from the feed water temperature T _IN to the hot water set temperature T _SP , and generates the feed forward heat amount P _{F / F.} The valve opening drive current to the proportional valve 14 is controlled so as to supply the amount of gas to be supplied.

Further, the total flow rate combustion control unit 54 operates in a state in which the second flow rate control means GM ₂ is closed and the total flow rate Q _T (the total flow rate Q _{T because} the second flow rate control means GM ₂ is closed). _T
= Feed forward heat amount P _{F / F} required to increase the hot water side flow rate Q) from the feed water temperature T _IN to the hot water set temperature T _SP , and a feedback heat amount for correcting the deviation of the hot water temperature T _{MIX from} the hot water set temperature T _SP to zero. P _{F / B} is calculated, and a gas amount required to generate a total heat amount obtained by adding the feed forward heat amount P _{F / F} and the feedback heat amount P _{F / B} to the proportional valve 14 is supplied to the burner 10. Controls the valve opening drive current.

The combustion control mode switching unit 52 designates the combustion control by the flow ratio combustion control unit 53 in the mixing operation state by the flow ratio control in mode 3, and causes the combustion control by the flow ratio combustion control unit 53 to be performed. On the other hand,
The hot water supply combustion operation is switched from the mixing operation in mode 3 to mode 2
When switched to the operation, i.e., when the closing signal of the second flow control means GM ₂ valve is applied from the fully closed position detection sensor 50 such as a Hall IC in a state where the signal of the hot-water supply on is detected Then, it is determined that the state of mode 3 has been switched to the operation state of mode 2, and the combustion control is switched from the flow rate combustion control unit 53 to the control of the total flow rate combustion control unit 54.

As described above, when the post-boiled water comes out of the hot water supply heat exchanger 1 and the hot water supply temperature T _MIX becomes overshoot water higher than the hot water supply set temperature T _SP , the hot water supply heat exchanger 1 is fed by the feedforward heat quantity. The new water entering the hot water supply heat exchanger 1 after the start of hot water supply combustion is heated by the heat of the feedforward heat amount P _{F / F} so that the temperature of the flow rate Q on the hot water side becomes the hot water supply set temperature, The post-boiled hot water remaining in the hot water supply heat exchanger 1 before the start of hot water supply is set so that the detected flow ratio between the bypass control flow rate Q _BP and the flow rate Q on the hot water side matches the target flow rate ratio, as described above. Flow control means GM ₁ ,
By controlling the opening degree of the valve of the GM ₂ , it is possible to supply hot water having a hot water supply set temperature substantially regardless of the degree of the post-boiler temperature.

Further, the operation state of mode 3 is shifted to the operation state of mode 2, and the combustion control mode is switched from the flow rate combustion control section 53 to the combustion control operation of the total flow rate combustion control section 54, so that the operation of the hot water supply combustion apparatus is started. The hot water supply can be stably performed in a combustion control mode capable of sufficiently exhibiting the maximum capacity.

FIG. 21 shows a hot water supply temperature T _MIX in a series of control operation states from the flow rate combustion control state to the total flow rate control.
And the relationship between the total flow rate Q _T and hot water side flow rate Q and the gas amount illustrates the time chart.

As shown in FIG. 21, the present embodiment is
Then feed forward in the mixing operation to eliminate post-boiling
The hot water supply temperature is controlled by controlling the flow ratio by supplying heat
Degree T _MIXIs almost the hot water set temperature T_SPWith a stable hot water temperature close to
It has been proven that
In the operation of mode 2, the hot water supply temperature is
Controlled with high precision, from flow ratio control to total flow control
There is no fluctuation of hot water temperature even at the boundary of switching
It has been verified that switching from control to total flow control is smooth
Have been.

Next, the control operation for switching from the flow rate control to the total flow rate control will be briefly described with reference to the flowchart of FIG. This operation shows a case where hot water is generated in the hot water supply heat exchanger 1 and the hot water supply operation is started in the mode 1 state.

[0133] First, the first on-signal from the flow sensor FS ₁ (running water on signal) is added at step 201 it is determined whether the hot water supply has been started. When it is determined that the hot water supply has been started, in the next step 202, the mixing operation is performed by the flow ratio control of the hot water side flow Q by the flow ratio control and the bypass control flow _QBP . Meanwhile, step 2
At 03, the burner combustion using only the feedforward calorie is performed by calculating the feedforward calorie PF _{/ F.}

In step 204, it is determined whether or not the mixing operation in mode 3 satisfies the termination condition, that is, the difference ΔQ between the total flow rate Q _T and the hot water side flow rate Q becomes equal to or less than the mixing termination determination flow rate, and the mixing termination prohibition time whether but it has elapsed, or if the mixing operation has exceeded the mixing allowed time determination is made, a second closing of the flow control means GM ₂ at the next step 205 when filled with mixing end condition.

In step 206, the second flow control means G
When M ₂ is determined whether or not a fully closed state, the detection signal of the fully closed position from the fully closed position detecting sensor 50 is applied,
Alternatively, when the push-in operation of the valve in the closing direction is further performed, and the end signal of the push-in operation is added, it is determined that the valve is in the fully-closed state, and the operation is shifted from the operation state in mode 3 to the total flow control in mode 2 ( Step 207).

On the other hand, the combustion control unit switches the combustion control mode from the flow rate combustion control to the total flow rate combustion control.
Feedforward calorie P _{F / F} and feedback calorie P
_The heating of the hot water supply heat exchanger 1 is controlled by the total amount of heat with the _{F / B.} In step 209 the first off-signal from the flow sensor FS ₁ determines whether added. When the OFF signal is not applied, the faucet of the hot water tap is not closed, and it is determined that the hot water supply is being used continuously, and the combustion operation is continuously performed by the total flow rate control. First
When the OFF signal from the flow sensor FS ₁ (running water off signal) is applied is closed is the hot-water tap is determined that the use of hot water supply is finished, ready for the next hot water to stop the combustion.

As described above, the operation of the flowchart starts with the hot water supply operation in the operation state of the mode 1 when the post-boiled water is generated in the hot water supply heat exchanger 1, and the flow rate ratio of the mode 3 Mode 2 from mixing operation by control
Of the hot water supply heat exchanger 1
When there is no over-boiled hot water remaining at the overshoot hot water temperature, the operation state of mode 2, that is, the second
The flow control means GM ₂ are waiting on the hot water in a closed state, when the hot-water supply operation is started in this state will make a hot-water supply operation immediately by the total flow rate combustion control.

[0138] The present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the above embodiment, solution data for obtaining the target flow rate ratio, the total flow rate, the hot water supply temperature, and the input temperature of the hot water side flow rate entering the first flow rate control means are given by the arithmetic expressions, respectively. The solution data may be given as table data, graph data, or the like.

Further, in the above embodiment, the mixing end prohibition time is given as the starting point when the flow rate difference ΔQ between Q _T and Q becomes equal to or less than the mixing end judgment flow rate, but this is set at the start of mixing (at the start of hot water supply). (In this case, the time becomes longer than the mixing end prohibition time starting from the time when ΔQ becomes equal to or less than the mixing end determination flow rate). In this case as well, as shown in FIG. 13, the time is automatically set in accordance with the flow rate of the water flow. it can.

[0140] Further, in the above embodiment, the steady operation mode operation unit 38, but the second flow control means GM ₂ was completely closed, advance of the second flow control means GM ₂ as stationary position The operation may be narrowed down to the determined valve opening amount. Thus, during operation of the mode 2, even if no second flow control means GM ₂ is closed, by performing a total flow combustion control during hot water supply operation, the hot water supply operation to provide maximum ability of apparatus has It can be performed.

Further, in the above embodiment, the post-boiling elimination standby mode operating section 37 operates the first flow control means GM ₁ and the second flow control means GM ₂ to a predetermined valve opening degree. Although the state in the first flow control means GM ₁ was equipped with the second flow control means hot water to fix the valve opening degree of the GM _2, detection of heat交出side temperature sensor 7 and heat exchanger auxiliary temperature sensor 22 The first flow rate control means GM ₁ according to the fluctuation of the hot water temperature of the hot water supply heat exchanger 1 so that the hot water of the hot water supply set temperature can be discharged based on the information of the hot water temperature and the hot water supply set temperature.
If it may be provided for the next hot water while the second valve opening of the flow control means GM ₂ and variable. In this case, at the start of hot water supply, hot water closer to the hot water supply set temperature can be supplied.

Further, in the above embodiment, when the hot water supply is stopped before the mixing termination condition is satisfied during the operation of the mode 3, the mode switching control unit 36 sets the post-boil remaining in the hot water supply heat exchanger 3. Mode 3
Were switched to mode 1 from the above, but when the hot water supply was stopped during the operation of mode 3, the presence or absence of post-boiling of the hot water supply heat exchanger 3 was detected, and the post-boiling of the hot water supply heat exchanger 3 was detected. At all times, in order to avoid high-temperature hot water caused by post-boiling, all the modes are switched from mode 3 to mode 1, that is, in the standby state for post-boiling elimination, the hot water supply heat exchanger 3 is prepared.
When no after-boiler is detected, the hot water supply heat exchanger 3
Mode 2 from Mode 3
, That is, in the steady operation state, to prepare for the next hot water supply operation.

[0143]

According to the present invention, the valve opening of the first and second flow control means is shifted from the mixing state to the steady operation position when the mixing termination condition is satisfied during the mixing operation. When it is determined that the influence of the after-boiling has disappeared, the valve openings of the first and second flow control means can be switched to the steady position, and the switching timing of the flow control means from this mixing state to the steady operation position can be changed. By switching the combustion control operation based on the flow rate control from the flow ratio control during the mixing operation to the total flow control at the appropriate timing when there is no fluctuation in the hot water supply temperature due to the switching from the flow ratio control during the steady operation to the total flow control. Can be switched smoothly.

If the hot water supply is stopped before the mixing end condition is satisfied, the post-boiling elimination standby mode operating section is designated to set the valve opening of the first and second flow control means to the post-boiling elimination standby state. Before the mixing end condition is satisfied, that is, when it is determined that the post-boiled water remains in the hot water supply heat exchanger, the first and second flow rate control units perform the post-boil elimination standby. When the hot water supply is started from this state, water having an amount of water that can eliminate the post-boiling is added to the post-boiled hot water from the hot water supply heat exchanger from the water supply control bypass passage, It is possible to supply hot water substantially at the set hot water supply temperature.

On the other hand, if the valve openings of the first and second flow rate control means are always shifted from the mixing operation state to the steady operation position, the post-boiler is installed in the hot water supply heat exchanger. Even when the hot water supply operation is stopped with the hot water still remaining, the valve openings of the first and second flow rate control means shift to the steady operation position, and thereafter the boiling water stays in the hot water supply heat exchanger. When the hot water supply is started from the state in which the hot water is supplied, the first and second flow control means are in the steady operation state as described above. It may not be possible to cause a problem that hot water with an overshoot higher than the set hot water supply temperature flows out.

According to the present invention, as described above, when it is determined that the post-boiled water remains in the hot water supply heat exchanger, the first
And the valve opening degree of the second flow control means is shifted to the post-boil elimination standby state. Therefore, when the hot water supply is started from a state where the post-boil is not eliminated, the post-boil is removed to the hot water thereafter. Possible water is added from the water supply control bypass passage, so that after-boiling can be reliably eliminated,
It is possible to reliably prevent overshooting at the start of hot water supply, and to provide a highly safe apparatus.

When the hot water supply is stopped during the mixing operation and the after-heating of the hot water supply heat exchanger is detected, the mode switching control unit controls the valve opening of the first and second flow rate control means to the mixing state. From the mixing state to the steady operation state when the after-boiling is not detected in the hot water supply heat exchanger. When the hot water supply is stopped during the mixing operation and the post-boil still remains in the hot water supply heat exchanger, the first and second flow rate control means surely shift to the post-boil elimination standby state. Therefore, as described above, when hot water supply is started from a state in which the post-boil has not been eliminated, the boiling can be eliminated thereafter, and high-temperature hot water discharge caused by the post-boil can be reliably avoided.
Further, when the after-boil is not detected in the hot water supply heat exchanger while the hot water supply is stopped, the hot water supply is prepared in the steady operation state, so that the hot water supply temperature can be quickly raised to the hot water supply set temperature at the start of the next hot water supply.

[Brief description of the drawings]

FIG. 1 is a block diagram showing various operation modes of a hot-water supply combustion apparatus which are characteristic of the present embodiment, and a configuration of switching the modes.

FIG. 2 is an explanatory diagram showing a flow of mutual switching between operation states from mode 1 to mode 4 in the embodiment.

FIG. 3 is an explanatory diagram of various model examples of a hot water supply combustion device to which the present invention is applied.

FIG. 4 is a block diagram of a main part configuration of a hot water supply combustion apparatus in the present embodiment that controls a flow ratio between a hot water side flow rate and a bypass control flow rate so that a detected flow rate ratio matches a target flow rate ratio.

FIG. 5 is an explanatory diagram showing a control mode of a valve opening degree of a first flow rate control means and a second flow rate control means in the embodiment.

FIG. 6 is a time chart of the after-boiler temperature, the hot-water supply temperature, and the operation of the flow rate control means GM ₁ , GM ₂ for explaining the flow ratio control operation for eliminating the post-boiling in the hot water supply heat exchanger in the embodiment.

FIG. 7 is a flowchart of an example of an operation for performing control for eliminating post-boiling so that the detected flow ratio matches the target flow ratio.

FIG. 8 is a diagram showing a result of calculating a hot water supply temperature in consideration of a post-boiler;
FIG. 3 is a block diagram of a control configuration of the present embodiment for performing a flow ratio control so that a hot water supply temperature obtained by this calculation matches a hot water supply set temperature.

FIG. 9: Hot water temperature is directly detected by a hot water temperature sensor,
It is a block diagram of a control configuration of the present embodiment for performing a flow ratio control of a hot water side flow rate and a bypass control flow rate in a direction in which a hot water supply temperature matches a hot water supply set temperature.

FIG. 10 is an explanatory view showing another model example of the hot water supply combustion device to which the present invention is applied.

FIG. 11 is a block diagram showing a control configuration for closing a second flow control unit in the embodiment.

FIG. 12 is a diagram illustrating the necessity of providing a mixing end prohibition time.

FIG. 13 is an explanatory diagram of a setting example of a mixing end prohibition time.

FIG. 14 is a block diagram of a configuration example in which the second flow control unit is indirectly closed by reducing the amount of feedforward heat.

FIG. 15 is an explanatory diagram of an example of setting a feedforward heat amount for indirectly closing a second flow control unit.

FIG. 16 is a block diagram showing a configuration example for pushing and driving the second flow control means further from the fully closed position in the closing direction at the end of mixing.

FIG. 17 is an explanatory diagram showing an example of a duty changing operation of the push-in closing drive voltage of the second flow control means.

FIG. 18 is a block diagram showing a configuration example of switching control from operation in mode 1 to operation in mode 2;

FIG. 19 is an explanatory diagram showing a peak temperature of hot water in a hot water supply heat exchanger in which overshoot and undershoot occur when hot water supply is started with the second flow control means closed.

20 is a block diagram showing an example of a switching control configuration of a combustion control mode at the time of transition from the mixing operation in mode 3 by the flow ratio control shown in FIG. 2 to the steady-state hot water supply operation in mode 2;

FIG. 21 is a time chart showing a relationship example between hot water supply temperature T _MIX , total flow rate Q _T , hot water side flow rate Q, and gas amount at the time of transition from flow rate ratio control to total flow rate control.

FIG. 22 is a flowchart of the present embodiment illustrating an operation at the time of transition from flow ratio control to total flow control.

FIG. 23 is an explanatory diagram schematically showing a configuration of a hot water supply combustion device prototyped earlier by the present applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hot-water supply heat exchanger 18 Water supply control bypass passage 36 Mode switching control part 37 After-boiling elimination standby mode operation part 38 Steady-state operation mode operation part 40 Mixing mode operation part GM ₁ First flow control means GM ₂ Second flow control means

Claims (2)

[Claims] 1. A hot-water supply heat exchanger for heating water supplied from a water supply passage by a combustion flame of a burner to produce hot water and sending the hot water to the hot water supply passage, and a hot-water supply heat exchanger between the water supply passage and the hot water supply passage. A water supply control bypass passage which bypasses the exchanger, and a first flow control means for controlling a flow on the hot water side where water flowing out from the water supply control bypass passage joins; and a flow passage for the water supply control bypass passage. A second flow rate control means for controlling a water flow rate, the hot water supply combustion apparatus having a function of detecting after-heating of the hot water supply heat exchanger when the hot water supply combustion is stopped, and A post-boiling elimination standby mode operating section for operating the valve openings of the first flow control means and the second flow control means to a preset post-boiling elimination standby position when post-boiling is detected; hot water supply heat exchange After boiling in the vessel When hot water supply is started from the first state
A mixing mode operation unit for controlling the valve opening degree of the flow control means and the second flow control means to control the flow ratio between the hot water flow rate and the flow rate of the water supply control bypass passage in the direction of eliminating post-boiling. A steady operation mode operating section for operating the valve opening of the first flow control means and the second flow control means to a predetermined steady position; and during the mixing mode operation,
When the hot water supply is stopped and no after-boiler is detected in the hot water supply heat exchanger, the above-mentioned steady operation mode operation section is designated to operate the first flow control means and the second flow control means from the mixing operation state to the steady operation. When the post-boil is detected, the post-boil elimination standby mode operation unit is designated to set the first flow control means and the second flow control means from the mixing operation state to the post-boil elimination standby state. And a mode switching control unit for shifting to a state to prepare for the next hot water supply operation. 2. A hot water supply heat exchanger for heating water supplied from a water supply passage by a combustion flame of a burner to produce hot water and sending the hot water to the hot water supply passage, and a hot water supply heat exchanger between the water supply passage and the hot water supply passage. A water supply control bypass passage which bypasses the exchanger, and a first flow control means for controlling a flow on the hot water side where water flowing out from the water supply control bypass passage joins; and a flow passage for the water supply control bypass passage. A second flow rate control means for controlling a water flow rate, the hot water supply combustion apparatus having a function of detecting after-heating of the hot water supply heat exchanger when the hot water supply combustion is stopped, and A post-boiling elimination standby mode operating section for operating the valve openings of the first flow control means and the second flow control means to a preset post-boiling elimination standby position when post-boiling is detected; hot water supply heat exchange After boiling in the vessel When hot water supply is started from the first state
A mixing mode operation unit for controlling the valve opening degree of the flow control means and the second flow control means to control the flow ratio between the hot water flow rate and the flow rate of the water supply control bypass passage in the direction of eliminating post-boiling. A steady operation mode operating section for operating the valve opening of the first flow control means and the second flow control means to a predetermined steady position; and during the mixing mode operation,
When a predetermined mixing termination condition is satisfied, the steady-state operation mode operation section is designated to shift the first flow control means and the second flow control means from the mixing operation state to the steady operation state. Mode switching control in which when the hot water supply is stopped before the condition is satisfied, the post-boil elimination standby mode operation section is designated to shift the first flow control means and the second flow control means from the mixing operation state to the post-boil elimination standby state. And a hot water supply combustion device, comprising: