JP3315209B2 - Control method of rising water amount at the time of re-water supply in water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of rising water at the time of re-watering in a water heater for stabilizing the temperature of the water at the time of re-watering.

[0002]

2. Description of the Related Art FIG. 9 shows a general system configuration of a water heater. In the figure, a water supply pipe 3 is connected to the inlet side of the heat exchanger 2, and the water supply pipe 3 is provided with a water input thermistor 10 for detecting a water supply temperature and a flow rate sensor 9 for detecting a water supply flow rate. ing. A hot water supply pipe 4 is connected to an outlet side of the heat exchanger 2, and a hot water tap 1 is provided at an outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water amount control valve 16 and a tapping thermistor 11 for detecting tapping temperature. The water amount control valve 16 includes a rotary valve type as shown in FIG. 9 and a vertically movable shaft type as shown in FIG. The amount of water passing through the exchanger 2 is adjusted.

A burner 7 and a burner 7 are provided below the heat exchanger 2.
An igniter electrode 18 for igniting the fuel, a flame rod electrode 19 for detecting ignition, and a combustion fan 5 for supplying and exhausting gas are provided.
The gas pipe 8 communicating with the gas nozzle 6 has a gas proportional valve 13 for controlling the gas supply amount by the valve opening amount.
And a gas solenoid valve 12 for opening and closing the pipeline. An outside air temperature sensor 31 for detecting an outside air temperature is provided near the combustion fan 5.

A water heater of this type is provided with a control device 14, and a remote controller 15 is connected to the control device 14, and the remote controller 15 is provided with a button for setting the hot water temperature and a display section for the set temperature. Have been. The controller 14 controls the hot water supply operation of the water heater, and as shown in FIGS. 7A and 7B, when the hot water tap 1 is opened, the flow rate sensor 9 detects the amount of water supply, and The controller receives a signal from the flow rate sensor 9 when the flow rate exceeds a certain level (minimum operating flow rate).
14 rotates the combustion fan 5. And the combustion fan 5
When the rotation of the motor enters a predetermined rotation region, the gas proportional valve 13 and the gas solenoid valve 12 are opened to supply gas to the burner 7, and the igniter electrode 18 performs an ignition operation. When the flame rod electrode 19 detects the ignition of the gas, the control device 14 performs feedback control to set the tapping temperature to the set temperature by PID calculation or the like, changes the opening amount of the gas proportional valve 13, and further, controls the water amount control valve. The stabilization control of the temperature of the hot water coming out of the heat exchanger 2 is performed by varying the valve opening amount of the valve.

When the hot water tap 1 is closed and an off signal is applied from the flow sensor 9 to the control device 14, the control device
14 stops combustion heating, makes the water amount control valve 16 fully open,
Prepare for the next hot spring.

However, when hot water is used intermittently, once the hot water tap 1 is closed, and then the hot water tap 1 is opened and the hot water is again supplied, as shown in FIG. The amount of heat held in the heat exchanger 2 is transmitted to the hot water remaining in the heat exchanger 2 and the hot water temperature rises above the set temperature. It takes a long time from the opening of 1 to normal feedback control, and since the water flow control valve 16 is fully open, the heat exchanger 2 has a large amount of cold before the feedback control is performed. Water enters, and if the large amount of water is heated to the set temperature, the thermal power of the burner 7 cannot catch up, and the undershoot water which is considerably lower than the set temperature will be discharged. Therefore, at the time of hot water supply again, a cold water sandwich phenomenon occurs in which hot water higher than the set temperature first comes out, then lukewarm water comes out, and then hot water at the normal set temperature comes out, which makes the user of the hot water uncomfortable. There was a problem of giving.

In order to solve such a problem, recently, when the hot-water tap 1 is closed, the water quantity control valve 16 is fully opened, and the water quantity control valve 16 is reduced to a certain amount to wait for the next hot water. Things are considered. In this case, when the hot water is re-discharged, hot water slightly higher than the set temperature is initially discharged as described above, but then a small amount of water is discharged to the heat exchanger 2 because the water flow control valve 16 is in a state of being throttled. Since the water enters, the small amount of water is sufficiently heated to the set temperature by the feedback control between the time when the hot-water tap 1 is opened and the time when the water leaves the heat exchanger 2. Therefore, at the time of hot water re-discharge, there is no fluctuation in the hot water temperature as in the cold water sandwich phenomenon, and the user of the hot water can comfortably use the hot water without feeling discomfort.

[0008]

However, if the water flow control valve 16 is kept in a standby state with the water flow control valve 16 always being throttled by a fixed amount in preparation for re-water supply, the water supply pressure may correspond to the opening amount of the water flow control valve 16. As described above, the tapping temperature is always close to the set temperature, but, for example, if the opening amount of the water flow control valve 16 is set at the time of shipping the water heater, depending on the area where the water heater is installed, In some cases, the distribution water pressure and the opening amount of the water amount control valve 16 do not correspond to each other. In this case, a considerable amount of water may flow when the hot water is re-discharged, so that the thermal power cannot catch up with the set temperature, and the hot water temperature undershoots again.

Further, even if the opening amount of the water amount control valve 16 is set at the shipping stage so as to correspond to the distribution water pressure of the destination, if the supply water pressure is changed to a higher value or fluctuates, the supply water pressure is increased. This changes the supply water pressure and the opening amount of the water amount control valve 16, and the undershoot of the hot water temperature occurs as described above.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reduce undershoots and overshoots even when the supply water pressure changes, without changing the hot water temperature at the time of re-starting hot water. An object of the present invention is to provide a method for controlling a rising water amount at the time of re-starting hot water in a water heater, which can be suppressed.

[0011]

The present invention is configured as follows to achieve the above object. In other words, the
According to a first aspect of the present invention, there is provided a method for controlling a rising water amount at the time of re-starting hot water in a water heater provided with a water flow control valve for controlling a flow rate of water flowing through the hot water heater. The hot spring water temperature under
-At least a lower limit is given to the target flow rate that suppresses the shoot.
The water flow control valve is monitored for a predetermined rising water flow control period at the time of re-watering of the water heater, and the rising flow flow rate of the water heater is monitored so that the rising flow stable flow rate falls within the target flow rate range. It is configured to control the valve opening amount . In the second invention, the supply
Water heater equipped with a water flow control valve that controls the flow rate of the water heater
In the method of controlling the rising water volume at the time of
To prevent undershoot of the temperature
Set the target flow rate range for
The water heater is turned on for a predetermined rising water flow control period.
The rising flow rate is monitored and the rising flow rate is
The opening amount of the water amount control valve is controlled so as to fall within the target flow rate range.
The predetermined rising water amount control period.
Means that the temperature of the tap water converges to the set temperature
Is characterized by giving in the period to reach
I have. Furthermore, the third invention controls the flow rate of the water heater.
At the time of re-watering in a water heater equipped with a rotating water flow control valve
In the rising water amount control method, beforehand
The target flow rate range at the start of
The target flow rate to suppress the undershoot of
Set it in a form that gives at least the lower limit width, and re-open the water heater
Water heater for a predetermined rising water volume control period when hot water
The rising flow water flow is monitored and the rising water flow is stabilized.
Open the water flow control valve so that the flow rate falls within the target flow rate range
The predetermined rising water amount control is to be performed.
During the period, the temperature of tap water converges to the set temperature from the start of tap water
Is characterized by giving in the period until
Have been. Further, a fourth invention is directed to the first or the second or the first or second aspect.
Is provided with the configuration of the third invention, and after stopping the hot water combustion,
The target flow rate range is corrected and changed based on information including one or more of the standby time until hot water supply, the water supply temperature, the outside air temperature, and the hot water supply combustion heat amount before hot water re-exposure. Japanese to control the rising water using
It is configured as a sign .

[0012]

When the hot water heater is re-watered, the opening amount of the water amount control valve is controlled so that the rising water flow rate is within the rising target flow rate range for suppressing the undershoot of the hot water temperature for a predetermined rising water amount control period. Is done. Therefore, even if the rising water flow rate fluctuates due to fluctuations in the water supply pressure, the rising water flow rate at the time of re-hot water is controlled so as to fall within the target flow rate range. The undershoot can be kept small.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same names as those in the conventional example, and the duplicated description thereof will be omitted. Further, the water heater system in this embodiment is the same as that shown in FIG. 9, but the water amount control valve 16 uses a shaft type as shown in FIG. The shaft type water flow control valve 16 includes a gear motor 17, a shaft 20, and a valve 2.
1, configured to have a valve port 22 and the like, wherein the rotation of the gear motor 17 causes the shaft 20 and the valve 21 to move forward and backward, and adjusts the opening amount of the water amount control valve 16 by adjusting the closing of the valve port 22. It is. That is, the opening amount of the water amount control valve 16 corresponds to the driving amount of the gear motor 17, that is, the throttle time for driving the gear motor 17 to open and close.

The method for controlling the rising water amount at the time of re-watering in the water heater according to the present embodiment sets the range of the rising water amount at which the undershoot of the hot water temperature at the time of re-watering is minimized as the target flow rate range. The opening amount of the water amount control valve 16 is controlled such that the rising water amount falls within the target flow rate range during a predetermined rising water amount control period at the time of tapping.

FIG. 1 is a block diagram of an initial water flow control unit 43 for performing a method of controlling a rising water flow at the time of re-starting hot water in a water heater according to the present invention. The initial water flow control unit 43 is formed in the control device 14, and the water flow detection unit 32
And a standby time measuring unit 34, a rising water amount control period setting unit 35, a target flow rate range setting unit 36, a rising water amount control unit 37, a memory 41, a data storage unit 42, and a plurality of timers.
40 and a rising water amount control unit 37.
Is composed of a water flow fluctuation detecting unit 38, a valve throttle time setting unit 39, and a valve driving unit 44.

The water inlet detector 32 detects the amount of water supplied in a stable amount within a certain monitoring time when the hot water tap 1 is opened, and detects it as a stable flow rate. The input water detection unit 32 is provided with an arithmetic circuit, receives a signal from the flow rate sensor 9 within a predetermined time set by the timer 40, stores it in the memory 41, and stores the immediately preceding signal within the predetermined time. The magnitude of each signal is equal to the magnitude of the current signal. As a result, when the magnitude of each signal becomes equal and the amount of water supply becomes stable, this stable water supply amount is detected as a rising flow stable flow rate. The water stable flow rate is temporarily stored in the memory 41 and added to the water flow fluctuation amount detection unit 38.

In addition, upon receiving the ON signal from the flow rate sensor 9, the water input detection unit 32 starts the operation of a timer 40 for measuring the rising water amount control time.

The standby time measuring unit 34 waits after the combustion stops, that is, from when the hot water tap 1 is closed and the flow sensor 9 is turned off to when the hot water tap 1 is opened and the flow sensor 9 is turned on again. The time is obtained by the operation of the timer 40, and the hot water discharge waiting time is temporarily stored in the memory 41.

The data storage section 42 stores various related data. These relation data include a target flow rate range for rising such that the undershoot of the hot water temperature is suppressed to a small extent, a rising water amount control period as a period for performing rising water amount control, and a gear motor 17 corresponding to a fluctuation amount of rising water amount. There is data on the set amount of aperture time.

The target flow rate range for rising is a range of ± α with respect to a target flow rate R as a rising water amount that minimizes undershoot of hot water temperature under the standard water pressure of the water heater. The upper limit of the target flow rate range is R + α, and the lower limit of the target flow rate range is R−
It is given by α. Since this target flow rate range depends on each condition such as the previous combustion amount as the hot water supply combustion heat amount before re-hot water supply, the supply water temperature, the standby time until re-hot water supply, and the outside air temperature, these conditions are changed. The target flow rate range R ± α is calculated by experiments, calculations, etc. and graph data (not shown)
Is stored in the form of

The rising water flow control period is a period in which the rising water flow stable flow rate is sequentially monitored, and the rising water flow rate is controlled to be within the target flow rate range.
The rising water amount control period is set by paying attention to the change over time of the tapping temperature as shown in FIG. 6 when the rising water amount increases due to the fluctuation of the supply water pressure. That is, the tap water temperature is slightly higher than the set temperature due to the post-boiling phenomenon immediately after the hot water tap 1 is opened, but thereafter, the gas fired power cannot catch up with the increased rising water volume to the set temperature, and the hot water temperature rises. become a undershoot, has become a normal set temperature is gradually catching up gas-fired, conversion
In other words, the temperature of the hot water converges to the set temperature convergently.
Ri, rising water control period, after opening the water tap 1, the normal set temperature (converges to the set temperature) is set up to the set temperature reaches the time t _1. The rising water amount control period depends on each condition such as the previous combustion amount, the outside temperature, the waiting time until re-hot water, the rising water amount, and the like, and the rising water amount control period when these conditions are changed. Are obtained by experiments, calculations, and the like, and are stored in the form of graph data (not shown).

The throttle time set amount of the gear motor 17 corresponding to the fluctuation amount of the rising water amount is determined by the fluctuation amount of the rising water amount from the target flow range when the rising water amount fluctuates outside the target flow range due to a change in the water supply pressure or the like. Is obtained by an experiment, a calculation, or the like in accordance with the fluctuation amount, and is stored in the form of graph data (not shown).

The data storage section 42 also stores other data described below. These stored data are, for example, 8 ± α as initial values of the target flow rate range at the rise.
₀ l / min is 1.5 seconds as a throttle time t from the fully open position of the water heater combustion stop of the gear motor 17, T _X seconds as the initial value of the rising water control period, the standard pressure and water heater during each water heater installation Are determined and stored by experiments, calculations, and the like in accordance with the combustion capacity of the engine.

The rising water amount control period setting section 35 uses the related data on the rising water amount control period stored in the data storage section 42 to calculate the last combustion amount added from the combustion control section of the control device 14 and the outside air temperature. The rising water amount control period under each condition of the outside air temperature detected by the sensor 31, the waiting time until re-hot water measured by the waiting time measuring unit 34, and the rising flow stable flow detected by the water entering detecting unit 32 Is set as the rising water amount control period H, and is added to the rising water amount control unit 37.

The target flow range setting unit 36 includes a data storage unit
Utilizing the related data relating to the target flow rate range at the start stored in 42, the previous combustion amount added from the combustion control unit of the control device 14, the outside air temperature detected by the outside air temperature sensor 31, and the standby time measurement unit The target flow range of the rise under each condition of the standby time until the hot water is measured at 34 and the feed water temperature detected by the water input thermistor 10 is read, and this is set as the target flow range R ± α, and the rise is set. It is added to the water amount control unit 37.

In the rising water amount control section 37, the rising flow rate stable flow rate is increased within the rising water amount control period added from the rising water amount control period setting section 35 by the upper limit R + of the target flow rate range added from the target flow rate setting section 36.
When it fluctuates beyond α, the opening amount of the water amount control valve 16 is variably controlled so that the rising water flow becomes the target flow.
The rising water amount control unit 37 includes the water flow fluctuation amount detection unit 38, the valve throttle time correction unit 39, and the valve drive unit 44, as described above, and the water flow fluctuation amount detection unit 38 includes a water flow detection unit. 32
The rising flow water flow rate L is monitored when the supply water pressure increases and the rising water flow rate L exceeds the upper limit R + α of the target flow rate range as shown by the dotted line in FIG. A difference LR between the target flow rate R and the target flow rate R is obtained, and this difference is set as a variation LR.

In the valve throttle time setting unit 39, the fluctuation amount L of the stable rising water flow added from the water flow fluctuation detecting unit 38 is calculated.
Based on -R, using the related data relating to the throttle time setting amount of the gear motor 17 stored in the data storage unit 42,
The throttle time set amount of the gear motor 17 required for setting the rising flow water flow rate to the target flow rate is obtained, set as the throttle time set amount Δt of the gear motor 17, and added to the valve drive unit 44.

The valve driving section 44 drives the gear motor 17 to close from the current position of the water flow control valve 16 by the throttle time set amount Δt of the gear motor 17 added from the valve throttle time setting section 39. Therefore, the rising water amount decreases as shown in the portion A of FIG. 3 and falls within the target flow rate range, so that the tapping temperature becomes substantially the set temperature as shown in FIG. 4, and the undershoot is suppressed to a small value.

The operation of the rising water amount controller 37 is as follows.
The timer 40 for measuring the rising water amount control period started when the flow rate sensor 9 is turned on is continued until the counting of the rising water amount control period H is completed. When the rising water amount control period elapses, the set temperature reaching time point t _{1 is} reached, and the tap water temperature is maintained at the set temperature by feedback control.

The memory 41 temporarily stores the rising flow rate detected by the water input detecting section 32 and the standby time until the second hot water measured by the standby time measuring section 34.

Next, the specific operation of this embodiment will be described with reference to the flowchart shown in FIG. First, when the power of the water heater is turned on, in steps 101 and 102, for example, 1.5 seconds as the throttle time t of the gear motor 17, 8 ± α ₀ liter / min as the target flow rate range for rising, and T _X as the rising water amount control period. Are set as the respective initial values. Next, in step 103, the remote controller 15 is operated to instruct a hot water supply operation.

In step 104, it is determined whether the hot water tap 1 is opened and the flow sensor 9 is turned on. If not, the process waits until the flow sensor 9 is turned on. When the flow rate sensor 9 is turned on, the timer 40 for measuring the rising water flow rate control period is operated.
Then, the combustion operation by the point ignition of the gas is started.

[0033] In the rising water control unit 37 in step 106, monitors the rising water flow stable flow rate, when the rising water passage stable flow rate is increased beyond the upper limit 8 + alpha ₀ of target flow range, rising through the water flow rate is the target flow rate The throttle time t of the gear motor 17 is set to 8 liter / min by the throttle time set amount Δt set by the valve throttle time setting unit 39,
The gear motor 17 is driven to close from the current position. Then,
Since the valve opening amount of the water amount control valve 16 is reduced, the rising water flow rate is reduced by the amount corresponding to the throttle time set amount Δt of the gear motor 17, and since it falls within the target flow rate range, the tapping temperature becomes almost the set temperature, and the undershoot is reduced. Can be kept small. Rising water control operation of step 106 is continued at step 107 until the rising water control period measuring timer 40 finishes counting only the rising water control period T _X.

After the elapse of the rising water amount control period T _{X, the} gear motor is set in step 108 so that the tap water temperature reaches the set temperature and the combustion capacity of the water heater is maximized.
Normal control of 17 aperture times is performed. Then step 10
At 9 it is determined whether the hot water tap 1 is closed and the flow sensor 9 is turned off, and if not, the normal control of the gear motor 17 is performed. At the same time as the flow sensor 9 is turned off, the timer 40 for measuring the waiting time for hot water is started to operate. At step 110, the combustion stop operation is performed. At steps 111 and 112, the gear motor is set so that the water amount control valve 16 is fully opened. 17 is driven to open.

Next, in step 113, the gear motor 17 is kept in a reduced state for a reduced time t, and waits for a second hot water supply.

Next, at step 114, the data storage unit 42
Using the relational data relating to the target flow rate range of the rise stored in the control unit 14, the previous combustion amount added from the combustion control unit of the control device 14, the standby time until re-hot water added from the standby time measurement unit 34, Target flow rate range R ± of rise under each condition of the supply water temperature detected by the thermistor 10 and the outside air temperature detected by the outside air temperature sensor 31.
Find α. Similarly, using the related data on the rising water amount control period stored in the data storage unit 42, the previous combustion amount, the standby time until re-hot water, the outside air temperature, and the water temperature are detected by the water entering detection unit 32 as described above. The rising water amount control period H under each condition of the rising rising water flow stable flow rate is obtained. Next, the target flow rate range is corrected and changed to R ± α, and the rising water flow control period is corrected and changed to H, and the process returns to step 104 and waits for hot water re-discharge. When the flow sensor 9 again tapping is performed in step 104 is turned on, the standby time of operation of the timer 40 for re-pouring wait time measured until the stop is re-tapping is Ru is measured determined.

In this embodiment, a rising target flow rate range for suppressing the undershoot of the hot water temperature is set, and during a predetermined rising water flow rate control period, the water flow rate is set so that the rising rising flow stable flow rate falls within the target flow rate range. Control valve
Since the valve opening amount of 16 is controlled, the tapping temperature becomes almost the set temperature regardless of the fluctuation of the water supply pressure, and the undershoot is suppressed to a small value.

Each time the hot water supply combustion is performed, the previous combustion amount,
Since the target flow rate range at the start is corrected and changed in consideration of the usage conditions such as the outside air temperature, the supply water temperature, and the waiting time for re-hot water, an appropriate target flow rate range according to the usage conditions will be set. The reliability of the hot water temperature stabilization control at the time of re-starting hot water is high and accurate.

Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in the above embodiment, the water amount control valve 16 is described as a shaft type, but a valve type may be used.

Also, in the above embodiment, when the supply water pressure fluctuates in the high direction and the rising flow stable flow rate exceeds the upper limit R + α of the target flow range, the rising flow flow rate is controlled to lower the hot water temperature. Although the chute is prevented, when the supply water pressure fluctuates in a lower direction and the rising flow stable flow becomes less than the lower limit R-α of the target flow range, the rising flow flow is controlled to control the hot water temperature. Shoots can also be kept small. In this case, the valve opening time set amount Δt of the gear motor 17 corresponding to the variation amount of the rising flow water flow rate with respect to the target flow rate is obtained, and then the gear motor 17 is opened from the current position by the set amount Δt to obtain the rising flow rate. The water flow rate becomes the target flow rate, and overshooting of the hot water temperature can be prevented.

Further, when the combustion is stopped, the gear motor 17 is kept in a standby state in preparation for the next hot water replenishment with the gear motor 17 being narrowed down from the fully open position for a certain throttle time. May be varied.
In this case, since the opening amount of the water amount control valve 16 corresponds to the feed water pressure before the hot water is re-started, even if the feed water pressure fluctuates after the hot-water re-start, the rising water amount is quickly controlled. Therefore, the responsiveness of the hot water temperature stabilization control is enhanced, and the undershoot of the hot water temperature is more effectively suppressed.

Further, in the above embodiment, the rising water flow control period setting section 35 determines the rising water flow control period based on all the information of the previous combustion amount, the outside air temperature, the waiting time until re-hot water, and the rising flow water flow rate. However, it may be determined based on information including one or more of these pieces of information.
Furthermore, if the rising water amount control period is determined in consideration of information such as the rotation speed of the combustion fan 5 in addition to the above information, a more accurate period can be determined. In this case, it is natural that the data of the rising water amount control period when the rotation speed of the combustion fan 5 is changed is stored in the data storage unit 42.

In the target flow rate range setting section 36, the target flow rate range at the start is set to the previous combustion amount, feed water temperature,
Although the waiting time until reappearing hot water and all the information of the outside air temperature are obtained, it may be obtained based on information including one or more of these information. Further, if the target flow rate range is determined in consideration of information such as the rotation speed of the combustion fan 5 in addition to the above information, a more accurate value can be obtained. Also in this case, it is natural that the data of the target flow rate range at the start when the rotation speed of the combustion fan 5 is changed is stored in the data storage unit 42.

Further, in the above embodiment, the correction of the rising target flow rate range is performed every time the hot water is re-discharged. However, the target flow rate range may be fixed without changing the correction. In this case, the control of the hot water temperature stabilization at the time of re-starting the hot water is somewhat less reliable than that of the present embodiment, but the hot water temperature stabilization control is improved compared to the conventional example, and Since the mechanism has a simpler configuration than that of the above embodiment, a low-cost water heater can be provided.

Further, in the above embodiment, the opening amount of the water amount control valve 16 is controlled by the throttle time of the gear motor 17,
It may be controlled by the movement amount of the valve 21 of the water amount control valve 16,
In addition, any control method may be used as long as the valve opening amount of the water amount control valve 16 can be controlled.

Further, in the above embodiment, 8 liter / min is set as the initial value of the target flow rate at the start, and 1.5 seconds is set as the initial value of the throttle time of the gear motor 17, but it is not limited to these values. It varies depending on the setting location of the water heater, the hot water combustion capacity, and the usage condition of the water heater user.

Further, in the above embodiment, the data storage section 42
Are given in the form of graph data, but may be given in the form of table data or arithmetic expressions.

Further, in the above embodiment, the target flow rate range is set to R ± α with a bandwidth of ± α with respect to the target flow rate R. However, α is an arbitrary value, including when α = 0. It is a thing.

[0049]

According to the present invention, the opening flow rate of the water flow control valve is controlled so that the rising flow rate falls within the target flow rate range during the predetermined rising flow rate control period at the time of re-starting hot water. Immediately within the target flow rate range for reducing the undershoot of the hot water temperature, regardless of the fluctuation of the water supply pressure, the outlet temperature becomes almost the set temperature,
Undershoot is kept small.

Further, the target flow rate range at the rise is corrected and changed based on information including at least one of the standby time until hot water replenishment, the hot water supply temperature, the outside air temperature, and the amount of combustion heat of hot water before hot water replenishment. Since the optimal target flow rate range based on this information is set in the information, the responsiveness of the hot water temperature stabilization control is good,
In addition, it is performed accurately, and the undershoot can be suppressed more effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a method for controlling a rising water amount at the time of re-starting hot water in a water heater according to the present invention.

FIG. 2 is a flowchart showing a specific operation of the embodiment.

FIG. 3 is a graph showing a change over time in a rising water amount in the example.

FIG. 4 is a graph showing a change over time in tapping temperature in the example.

FIG. 5 is a graph showing the change over time of the rising water volume at the time of the standard water pressure and when the water pressure becomes higher than the standard water pressure.

FIG. 6 is a graph showing a situation in which an undershoot of hot water temperature occurs due to a change in rising water amount.

FIG. 7 is a graph showing a conventional general rising water amount and a change over time of a tapping temperature.

FIG. 8 is a sectional view showing a shaft type water amount control valve.

FIG. 9 is a configuration diagram showing a water heater system.

[Explanation of symbols]

 16 Water flow control valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-288628 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/10 302

Claims (4)

(57) [Claims] In a method for controlling a rising water amount at the time of re-starting hot water in a water heater provided with a water flow control valve for controlling a flow rate of water flowing through a hot water heater, a target flow rate range of rising which suppresses undershoot of the temperature of re-starting hot water in advance. The temperature of the hot water
Set at least the lower limit to the target flow rate to
It is set in a given form, and when the water heater is re-watered, the rising water flow rate of the water heater is monitored over a predetermined rising water amount control period, and the water flow control valve is adjusted so that the rising water flow stable flow falls within the target flow rate range. A method for controlling a rising water amount at the time of re-starting hot water in a water heater, comprising controlling a valve opening amount of the water heater. 2. A water amount control valve for controlling a flow rate of water flowing through a water heater.
Control of rising water quantity at the time of hot water re-supply in water heater with water supply
In the method, undershoot the temperature of the hot spring water beforehand
Set the target flow rate range for rising
When the hot water is re-watered for a predetermined rising water amount control period
To monitor the flow rate of the rising water from the water heater.
Water flow rate so that the stable flow rate is within the target flow rate range.
The opening amount of the control valve shall be controlled, and the predetermined rise
During the water flow control period, the temperature of the hot water is set from the start of hot water
The feature is that it is given in the period until the temperature converges
Of controlling the amount of rising water at the time of re-watering in a hot water heater. 3. A water amount control valve for controlling a flow rate of water through a water heater.
Control of rising water quantity at the time of hot water re-supply in water heater with water supply
In the method, undershoot the temperature of the hot spring water beforehand
The target flow rate range of the rise is suppressed.
Set at least the lower limit to the target flow rate to
Set it in the given form, and set it to the specified
Hot water heater rising through the rising water flow control period
Monitor the water flow rate, and set the rising flow
The opening of the water control valve is controlled so that it falls within the flow rate range.
In the predetermined rising water amount control period,
From the start until the tap water temperature converges to the set temperature
Hot water supply in a water heater characterized by giving during the period
How to control the amount of rising water at the time. 4. After standby for hot water supply after the stop of hot water supply combustion
, One of water supply temperature, outside air temperature, hot water supply calorie before re-water supply
Correcting and changing the target flow rate range based on the information including the above,
At the time of hot water re-use, this corrected and changed target flow rate range is used.
Rising water Claim 1 or Claim 2 to control the amount
Claim 3 The rising water amount at the time of re-watering in the water heater according to claim 3.
Control method.