JPH04106326A - Hot water feeder with hot water feeding function - Google Patents

Abstract

PURPOSE:To provide a hot water feeder having a hot water feeding function which is safe and convenient in use without causing any dangerous state of burn by supplied hot water by a method wherein a changing-over solenoid valve is closed when a temperature detected by a temperature sensing means reaches a specified changing-over temperature. CONSTITUTION:In the event that hot water is being supplied to a bath tub, a hot water feeding from a hot water feeding pipe 18 is detected and then a changing-over solenoid valve 25 is closed when the set temperature of the temperature setting means 42 is higher than a predetermined temperature and set to a changing-over temperature determined higher by the first specified temperature than the set temperature in response to the set temperature, a supplying of hot water to the bath tub B is stopped and the heated hot water is supplied to a hot water feeding pipe. Accordingly, hot water of relative high temperature can be rapidly used as required, In turn, when the hot water feeding is detected, the changing-over solenoid is closed when the set temperature reaches the changing-over temperature determined to a higher temperature than a predetermined temperature by the second specified temperature and then a supplying of hot water to the bath tub is stopped and the heated hot water is supplied to a hot water feeding pipe and the hot water does not provide any burn and a safety operation can be assured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater having a function of automatically filling a bathtub with hot water.

U Prior Art] In a water heater with a hot water filling function, a hot water supply pipe that supplies hot water heated by a heat exchanger to each hot water supply port and a hot water filling pipe that is connected to, for example, a bathtub and directly supplies water to the bathtub exchange heat. Some are branched off at the outlet of the vessel.

In such water heaters, the hot water filling pipe is equipped with a solenoid valve to control the filling of hot water into the bathtub, and when hot water filling is instructed by a hot water filling switch on the remote control, the solenoid valve opens and hot water filling starts. When the flow rate sensor detects that the set amount of water has been supplied, or the water level sensor detects that the water has been filled to the set water level, the solenoid valve is automatically closed and the water is filled. Finish.

In addition, in such water heaters, for example, if the temperature of the hot water supplied to the bathtub drops and the reheating function is not provided to reheat it, it is difficult to increase the amount of hot water in the bathtub too much. In order to effectively raise the temperature of hot water, a hot water gutter is provided to additionally supply hot water at a high temperature (for example, 75°C to 93°C) into the bathtub.

On the other hand, in order to detect whether hot water is being supplied at the hot water supply inlet during hot water filling or high temperature vortex, for example, the bypass pipe that connects the hot water supply pipe and the water supply pipe is equipped with a water flow switch. If hot water is being supplied at the hot water inlet while the hot water is being filled, and this is detected, the above-mentioned solenoid valve will be closed to stop the hot water filling for one month, and the hot water heated by the heat exchanger will be given priority for hot water supply. It is supplied to the pipe.

In such water heaters, in order to prevent the hot water from inadvertently flowing out of the hot water supply spout, especially when hot water is being poured at a high temperature and the hot water is used at the hot water supply spout without realizing it.
The electromagnetic valve is not closed until the temperature of the water flowing out from the heat exchanger falls to a hot water supply temperature set by a separately provided remote control or the like, or until the temperature falls to a predetermined temperature.

[Problems to be Solved by the Invention] However, in the above-mentioned water heater, the closing operation of the solenoid valve is delayed until the water temperature drops to the hot water supply setting temperature set by the remote control, for example, or to a safe temperature that does not pose the risk of burns. and,
While in town, unheated water flows out of the hot water supply opening, and it takes time for the heated hot water to flow out, which irritates users.

The present invention provides a high-temperature pouring hot water 8 in which high-temperature hot water is supplied to a bathtub.
In a water heater that has a high-temperature water supply function such as a high-temperature water supply, when hot water is supplied at the hot water supply port while high-temperature water is being supplied, heated hot water is promptly supplied as needed, and the hot water that is supplied is To provide a safe and easy-to-use water heater with hot water filling function that is free from danger of burns and the like.

[Means for Solving the Problems] In the first aspect of the present invention, there is provided a hot water supply pipe having a water faucet at its end that is opened and closed by manual operation, and a switching solenoid valve that controls the supply of hot water to the bathtub. In a water heater with a hot water filling function, in which a hot water filling pipe is branched to an outflow part of a hot water supply circuit including a heat exchanger heated by a heating means, in response to an operation to a high temperature water supply instruction means. temperature setting means having a high-temperature water supply function of supplying high-temperature hot water to the bathtub via the hot water filling pipe, and setting a target temperature of hot water flowing out from the hot water supply circuit; and hot water flowing out from the hot water supply circuit. and a hot water supply detection means for detecting hot water supply from the hot water supply pipe via the water faucet during supply of high temperature water by the high temperature water supply function, the hot water supply detection means When hot water supply is detected, the switching solenoid valve is closed when the temperature detected by the temperature detecting means reaches a switching temperature, and the switching temperature is set when the temperature set by the temperature setting means is equal to or higher than a predetermined temperature. In this case, the temperature is determined to be a first constant temperature higher than the set temperature, and when the temperature is lower than the predetermined temperature, the temperature is determined to be a second constant temperature higher than the predetermined temperature.

Further, in the second invention, the switching temperature is set to a first temperature higher than the set temperature when the set temperature of the temperature setting means is higher than the predetermined temperature.
If the temperature is lower than a predetermined temperature, the temperature is determined to be higher than the set temperature by a second constant temperature, and the second constant temperature is set lower than the first constant temperature. This is a technical means.

In the first aspect of the present invention, when hot water supply from the hot water supply pipe is detected when high temperature water is being supplied to the bathtub, if the set temperature of the temperature setting means is higher than a predetermined temperature, When the switching temperature reaches a switching temperature that is determined to be higher than the setting temperature by a first constant temperature according to the setting temperature, the switching solenoid valve is closed and the supply of high-temperature water to the bathtub is stopped, and the heated hot water is returned to hot water supply. Tube I\supplied.

In this case, the switching temperature is determined to be a first constant temperature higher than the set temperature according to the set temperature, so the temperature of the hot water heated by the heat exchanger changes from the high temperature for supplying high-temperature water. The time it takes to reach the switching temperature is short.

Therefore, there is no need to wait for a long time until the heated water flows out after operating the faucet at the hot water supply opening. Therefore, relatively high temperature hot water can be quickly used as needed.

In addition, in this case, the user knows that the temperature of the water flowing out from the hot water inlet is high because the user has set a relatively high temperature above the predetermined temperature as the set temperature. Because of the precautions taken, there is little risk of burns even if high-temperature water suddenly spills out.

On the other hand, when hot water supply is detected and the set temperature is lower than the predetermined temperature, the switching solenoid valve is closed when the switching temperature is determined to be higher than the predetermined temperature by a second constant temperature. The supply of high temperature water to the bathtub is stopped, and the heated hot water is supplied to the hot water pipe.

When hot water flows out from the hot water supply opening, the temperature of the hot water has definitely dropped to a temperature below which there is no risk of causing burns, for example, so if you set a relatively low temperature, the temperature of the hot water flowing out is high. Safety can be ensured without causing burns, etc., even to users who pay little attention to the risk of injury.

Further, in the second invention, when the temperature is lower than the predetermined temperature, the temperature is determined to be higher than the set temperature by the second constant temperature, and the second constant temperature is set lower than the first constant temperature, It takes some time for the high temperature of the hot water used to supply high-temperature water to drop to a relatively low switching temperature, but similarly, the temperature has definitely dropped to a temperature below which there is no risk of causing burns, etc., so there is no risk of water flowing out. Even for users who pay little attention to the water temperature, safety can be ensured without causing burns or the like.

[Effects of the Invention] In the present invention, when hot water is supplied while high-temperature water is being supplied, when the set temperature is high and the user is paying attention to the temperature of the hot water flowing out, can provide hot water more quickly than conventional methods.

On the other hand, if the set temperature is relatively low and you are not paying sufficient attention to the high temperature of the hot water flowing out, the water may not be heated until it reaches a temperature that does not pose a risk of burns. The hot water flows out from the hot water supply opening, making it safe to use.

[Example] Next, the present invention will be explained based on examples.

The gas water heater 1 with hot water filling function shown in FIG. 2 supplies hot water to several hot water ports equipped with hot water taps (not shown) and automatically fills a bathtub B with hot water. A heat exchanger 10 for heating water supplied from a water supply source such as a water supply source, and a heat exchanger 2 in which a plurality of plate burners are arranged as a heating source.
A burner group 3.3a is provided in the combustion case 2, and a blower l! for supplying combustion air to the burner group 3.3a is provided. ! 4 are provided.

Gas supply path 5 that supplies fuel gas to each burner group 3.3a
is provided with a master solenoid valve 5a for controlling the supply of fuel gas, and a governor proportional valve 5b for adjusting the opening degree according to the target combustion amount to adjust the supply amount of fuel gas.
The gas supply path 5 branches downstream of the burner group 3, and the burner group 3 side is provided with a small solenoid valve 6 that opens during combustion and closes when stopped, and the burner group 3a side is provided with a small electromagnetic valve 6 that opens when combustion occurs and closes when the burner group 3a stops. A small electromagnetic valve 6a that is opened and closed is provided, and downstream of each small electromagnetic valve 6.6a, a nozzle group for spouting fuel gas corresponding to each burner group 3.3a is provided, and two chambers 7a and 7b are provided with a nozzle group for ejecting fuel gas. A divided manifold 7 is connected.

Also provided within the combustion case 2 are an ignition electrode 8 of the burner group 3.3a and a flame rod 9 for flame detection.

On the other hand, a water supply pipe 11 connected to a water supply or the like for supplying water to the heat exchanger 10 is equipped with a filter 12 at the most upstream part to prevent foreign matter from entering, and downstream of the filter 12, the water supply pipe 11 is connected to a water supply pipe or the like. A large water temperature thermistor 13 and a flow rate sensor 14 are provided to detect the temperature of the water.

A hot water outlet pipe 15 through which hot water flows out from the heat exchanger 10 is provided with a hot water outlet temperature thermistor 16 that detects the temperature of the water heated by the heat exchanger 10.
Hot water flow servo 1 for adjusting the flow rate of hot water passing through 0
7 is provided.

The hot water flow servo 17 has a tapered valve body fixed to the tip of a rotary shaft supported by a feed screw mechanism, and this valve body is arranged in an opening to connect the rotary shaft to the output shaft of a geared motor. When the geared motor rotates, the valve body moves within the opening by the aforementioned feed screw mechanism to adjust the degree of opening, thereby adjusting the passing flow rate.

The hot water outlet pipe 15 branches downstream of the hot water amount servo 17, and one side becomes a hot water supply pipe 18 connected to several hot water supply ports (not shown), and the other side becomes a hot water filling pipe 19 connected to the bathtub B.

The hot water supply pipe 18 is connected to the water supply pipe 1 downstream of the inlet water temperature thermistor 13.
The bypass pipe 20 is connected to a bypass pipe 20 branched from the bypass pipe 20, and the bypass pipe 20 includes a bypass solenoid valve 2 for opening and closing the bypass pipe 20 to control communication between the water supply pipe 11 and the hot water supply pipe 18.
1 and a water flow switch 22 for detecting the water flow flowing through the bypass pipe 20.

A connecting part between the hot water supply pipe 18 and the hot water outlet pipe 15 is provided with a valve to prevent water from flowing into the hot water filling pipe 19 from the side of the bypass pipe 20 that communicates with the water supply pipe 11 when the bypass solenoid valve 21 is in the open state. A check valve 23 is provided, and a pressure relief valve 24 is provided integrally with the check valve 23 in the hot water pipe 18 to protect the heat exchanger 10 and the like from high pressure generated due to an abnormality such as residual fire. .

The hot water filling pipe 19 includes a hot water filling solenoid valve 25 for controlling hot water filling and a check valve 26 for preventing backflow of hot water from the bathtub B.
A check valve 26 is provided upstream of the check valve 26 and is activated when negative pressure is generated due to a water outage, etc., to close the hot water outlet pipe 15.
Negative pressure operated valve (vacuum breaker) 2 that opens to the atmosphere
7 is provided.

The gas water heater 1 with a hot water filling function on the side of Honjitsu, which has the above configuration, has a control unit W30 provided in the water heater case IA.
controlled by

The control device 30 consists of a microcomputer and a drive circuit, and includes a combustion control unit for controlling the combustion state of each burner group 3.3a, and a flow rate of hot water passing through the heat exchanger 1o, automatic hot water filling, or high-temperature pouring. The control device 3o is equipped with a bath remote controller 41 and a main remote controller 42 to set and operate the operating state.

The control device 30 performs a hot water supply operation when water flow in the hot water pipe 18 is detected by opening a hot water tap (not shown), and also performs hot water supply operation by operating a hot water filling switch or hot water pouring switch (not shown) provided on a bath remote control 41. Automatic hot water filling operation and hot water pouring operation are performed, and combustion control and water amount control are performed in each operation.

First, hot water supply operation will be explained based on FIG. 3.

In the hot water supply operation, when the hot water tap (not shown) is opened, if it is detected that the flow rate detected by the flow rate sensor 14 is equal to or higher than the operation start water amount (YES in step 1), it is determined that the water flow is detected and a predetermined sequence is performed. Ignition control is performed (step 2).

Here, the operation start water amount is a water amount that is selected each time the operation is performed according to the supply water temperature detected by the inlet water temperature thermistor 13 from the water amount values set in eight stages.
As one of them, 2.61/min is set.

Following the ignition control, the hot water supply temperature set by the remote controller is read as the target temperature in the temperature control.

When the burner group 3.3a is ignited by the ignition control and the ignition is detected by the flame rod 9, temperature control is performed based on the target temperature, each thermistor 13.16, and each detection signal from the flow sensor 14 (step 3 ).

In temperature control, the aforementioned target temperature and inlet water temperature thermistor 13 are used.
Feedforward control is performed based on the temperature detected by the temperature sensor 14 and the flow rate detected by the flow rate sensor 14, and when the outlet temperature detected by the outlet hot water temperature thermistor 16 reaches a predetermined condition, the control is further performed based on the temperature detected by the outlet hot water temperature thermistor 16. performs feedback control.

Thereafter, in hot water supply operation, when the hot water tap is closed and it is detected that the flow rate detected by the flow rate sensor 14 has become less than the operation stop water amount (YES in step 4), a predetermined extinguishing control is performed (step 5). ).

This operation stop water amount is also set in the same way as the operation start water amount.
One of the stages is selected depending on the supply water temperature detected by the inlet water temperature thermistor 13.

If 2.6 Jl/min is selected as the above-mentioned operation start water amount, the operation stop water amount is 1. 'l/min is selected.

During the automatic hot water filling operation and high-temperature hot water pouring operation, which will be described later, the hot water supply operation also starts when the water flow switch 22 of the bypass pipe 20 detects that the hot water tap at the hot water inlet is open. An interrupt operation is performed for the high-temperature pouring hot water operation, and the hot water supply operation is performed preferentially.

Therefore, after the extinguishing control in the hot water supply operation is completed, it is determined whether the hot water supply operation was an interrupt operation in another automatic hot water filling operation or high temperature pouring operation.

In the case of an interrupt operation during automatic hot water filling operation (YES in step 6), the process moves to step 13 of automatic hot water filling operation, which will be described later. In the case of hot water operation (YES in step 7), the process moves to step 43 for high temperature pouring hot water operation shown in FIG.

Next, automatic hot water filling operation will be explained based on FIG. 4.

The automatic hot water filling operation is performed in response to a hot water filling instruction from the hot water filling switch of the bath remote controller 41. When the operation of the hot water filling switch is detected, Y is selected in step 11.
ES), whether or not hot water supply operation is being performed is determined based on the value of the flow rate detected by the flow rate sensor 14 and the ignition detection signal.

In this determination, if the detected flow rate is less than the operation stop water amount, it is determined that hot water supply operation is not being performed, regardless of the ignition detection signal, and if the detected flow rate is greater than the operation stop water amount and smaller than the operation start water amount, the ignition is determined. If there is a detection signal, it is determined that hot water supply operation is in progress, and if there is no ignition detection signal, it is determined that hot water supply operation is not in progress.

If it is determined that the hot water supply operation is not being performed (NO in step 12), the automatic hot water filling operation from step 13 onwards is continued as described below.

If it is determined that the hot water supply operation is being performed (YES in step 12), that effect is displayed on the display device of the bath remote controller 41, and the process proceeds to step 4, where the process waits until the hot water supply operation is completed.

In step 13, valve opening control is performed to open the hot water filling solenoid valve 25.

This valve opening control is a control in which the hot water amount servo 17 is driven in conjunction with the hot water filling solenoid valve 25 in order to prevent water hammer from occurring when the hot water filling solenoid valve 25 is opened, and the details will be described later.

When the hot water filling electromagnetic valve 25 is opened by the valve opening control, water normally passes through the hot water filling pipe 19 accordingly, and the flow rate L detected by the flow rate sensor 14 exceeds the operation start water amount and water flow is detected. be done.

If water flow is detected (YES in step 14),
Ignition control is performed in a predetermined sequence as in the hot water supply operation (step 15), and furthermore, after ignition is detected by the flame rod 9, temperature control is performed (step 16).
).

In this temperature control, when automatically filling the water, the bath remote control 4
Control is performed using the hot water filling temperature set in step 1 as the target temperature.

During this automatic hot water filling operation, if the user opens the hot water tap at the hot water inlet to supply hot water, the bypass pipe 2
When the water flow switch 22 detects that the water flow is in the zero state, the water flow switch 22 is turned on, and as described above, the hot water supply operation is performed with priority over the automatic hot water filling operation.

If it is detected that the water flow switch 22 is in the on state (YES in step 17), in order to change to the hot water supply operation based on the hot water supply temperature set by the remote control,
Step 1 of performing valve closing control to close the hot water filling solenoid valve 25
8), move on to step 2.

On the other hand, if there is no operation for hot water supply operation during the automatic hot water filling operation, the answer is NO in step 17 (No in step 17). , the hot water filling operation at the hot water filling temperature set by the bath remote controller 41 is continued.

If the integrated value of the flow rate detected by the flow rate sensor 14 reaches the set water filling amount (YES in step 19), a valve closing control is performed to close the hot water filling solenoid valve 25 (
Step 20).

The valve closing control in step 20 follows a sequence substantially similar to the valve closing control in step 18 described above, and the details will be described later.

If the flow rate decreases due to the valve closing control and the flow rate detected by the flow rate sensor 14 becomes less than the operation stop water rate (YES in step 21), it is determined that water flow has ended and predetermined extinguishing control is performed. (step 22), and the automatic hot water filling operation is ended.

Next, regarding the valve opening control in step 13 above,
This will be explained based on FIG.

The valve opening control is to prevent a large amount of water from passing through when the hot water filling solenoid valve 25 opens. First, the bypass solenoid valve 21 is opened (step 31), and as mentioned above, this is done automatically. In order to prioritize the hot water supply operation over the hot water filling operation, the hot water supply pipe 18 and the water supply pipe 11 are communicated through a bypass pipe 20 so that hot water supply can be detected during the automatic hot water filling operation.

Subsequently, in order to limit the passing flow rate, the opening degree of the hot water flow servo 17 is minimized (step 32).

After this, the hot water filling solenoid valve 25 is opened (step 33). At this time, since the flow rate is limited by the hot water amount servo 17, the passing flow rate is small and the occurrence of water hammer can be eliminated.

Thereafter, the opening degree of the hot water flow servo 17 is increased (step 34), and the flow rate is increased again. As a result, the flow rate passing through the flow rate sensor 14 is reliably increased to make the detected flow rate equal to or higher than the operation start water amount.

Next, the valve closing control in steps 18 and 20 described above will be explained based on FIG. 6.

Similar to the valve opening control described above, the valve closing control is to prevent the occurrence of water hammer, and if the detected flow rate when performing the valve closing control exceeds the water filling stop water volume (in step 35, the N
o) + Reduce the opening degree of the hot water flow servo 17 (step 3)
6) Move to step 35/\ and repeat steps 35 and 36 until the detected flow rate becomes equal to or less than the water filling stop amount.

If the flow rate detected by the flow rate sensor 14 is less than the water filling stop water volume (YES in step 35), the flow rate is so low that water hammer does not occur.
While closing the hot water filling solenoid valve 25 (step 37),
Bypass solenoid valve 21 is also closed (step 38).

Here, when switching to hot water supply operation, the hot water filling solenoid valve 2
Even if 5 is closed, hot water can flow out from the hot water supply opening, so water hammer is less likely to occur, but when the hot water is filled,
Because there is no place for hot water to escape, water hammer is likely to occur.

For this reason, the amount of water at which the hot water is filled is set at approximately 109/min in step 18 to switch over to hot water supply operation as soon as possible, and approximately 4.5 fJ/min in step 20. ing.

Next, the hot water pouring operation will be explained based on FIG. 7.

The high-temperature hot water operation is performed when the water temperature in bathtub B decreases.
This is an operation operation for heating hot water instead of reheating using a bath pot, and it is a preset flow rate of 80°C hot water per minute. -5 For example, 3 minute bathtub B
It is something that is supplied to the inside.

Note that this time can be arbitrarily set in step 1) on the bath remote control '41.

Here, when an instruction is given by operating the hot water switch on the bath remote control 4, hot water is poured for a predetermined period of time.

When the operation of the hot water switch is detected (Step 41)
YES), as in the case of automatic hot water filling operation, it is determined whether or not hot water supply operation is in progress based on the flow rate detected by the flow rate sensor 14 and the ignition detection signal). If not, 4.1 (NO at step 42), the hot water pouring operation continues.

On the other hand, if hot water supply operation is being performed ν) (often YES in step 42), the system moves to step 4/\,
Wait until hot water supply operation is finished.

If the hot water pouring operation is to be performed as determined in step 42, the valve opening control shown in FIG. 5 is performed as in the case of automatic hot water filling operation (step 43).

Regarding valve opening control, water flow starts, and when water flow is detected when the detected flow rate I- of the flow rate sensor 14 is equal to or higher than the operation start water flow (YES in step 44), ignition control (step 45) is performed.
) and high temperature control are performed continuously (step 46
).

In high-temperature control, the target temperature for temperature control is determined to be 80°C regardless of the temperature set by the main remote controller 42 or the bath remote controller 41, and the detected temperature of the hot water temperature thermistor 16 provided in the hot water pipe 15 is 80°C. ℃, the combustion amount of the burner group 3.3a is determined, and the governor proportional valve 5b, small solenoid valve 6.6a and blower 4 are adjusted accordingly.
is driven and controlled.

The high-temperature pouring hot water operation is a relatively short-time operation, but if the hot water tap is opened for hot water supply operation during this operation, it is detected by the water flow switch 22.

If the ON state of the water flow switch 22 is detected during the high-temperature pouring hot water operation (YES in step 47), the hot water supply operation is changed as shown in steps 52 and subsequent steps.

If the ON state of the water flow switch 22 is not detected during hot water pouring operation (No in step 47), it is determined whether hot water pouring under predetermined conditions has ended, and if it has not ended, then (No in step 48),
The process moves to step 46.

As a predetermined condition, if the high-temperature pouring hot water operation ends after the 3-minute operating time has passed (YES in step 48), extinguishing control is performed first (step 49), and the solenoid valve is turned off. Close the burner to stop combustion and stop heating, and then, when the hot water temperature detected by the hot water temperature thermistor 16 becomes 50°C or less (YES in step 50) - valve closing control is performed and the hot water filling solenoid valve is closed. 25
is closed (step 51).

As a result, even if hot water is supplied immediately after the high-temperature pouring operation ends, only hot water that has dropped to 50° C. or lower flows out of the hot water supply opening, so there is no risk of burns and it is safe.

On the other hand, if hot water supply is detected in step 47 and the hot water supply operation is performed during the high temperature pouring operation (YES) - in order to prevent hot water from flowing out from the hot water supply opening against the user's will, It is controlled as follows.

First, in the high-temperature pouring hot water operation, the target temperature for temperature control, which has been determined to be 80° C., is changed to the hot water supply set temperature set on the remote control (step 52).

Normally, the hot water supply setting temperature is lower than the target temperature of 80°C in high-temperature hot water pouring operation, so the hot water flow servo 17
Increase the opening degree to increase the flow rate (step 53)
, to quickly lower the water temperature.

Thereafter, it is determined whether the hot water temperature detected by the hot water temperature thermistor 16 has become lower than the switching temperature Ta determined based on the hot water supply temperature set by the remote controller, and the hot water temperature has become lower than the switching temperature Ta. (YES in step 54), valve closing control is performed (step 55), and the process moves to step 2 to perform hot water supply operation.

Next, a first example of determining the switching temperature Ta in step 54 will be described based on FIG. 1.

This switching temperature Ta is intended to ensure safety at the hot water supply inlet and to supply hot water as quickly as possible when switching from hot water pouring operation to hot water supply operation.

Here, the user sets the hot water supply temperature TSet to 50℃.
If a relatively high temperature is set as above (step 6
1), in order to be able to quickly supply hot water, Ta = TSet + 15 ['
C] That is, the hot water supply setting temperature T se is set as the switching temperature Ta.
Step 62) to determine the temperature 15°C higher than t, and if the hot water supply temperature 'l'set is set to a temperature that does not reach 50['C], no in step 61
), it is thought that insufficient attention is paid to high-temperature hot water, so the temperature at which it is safe to touch hot water with hands etc. is Ta = 57 ['C], that is, the switching temperature Ta
57[”C] is uniformly determined as (step 63)
.

FIG. 8 shows the relationship between the hot water supply setting temperature TSet and the switching temperature Ta.

In addition, after the hot water supply operation is completed, as mentioned above, it is determined whether the automatic hot water filling operation or the hot water pouring operation is in progress. will resume their respective operations.

In that case, when automatic hot water filling operation is restarted, the remaining hot water filling flow rate is integrated based on the stored flow rate integration value, and in high temperature hot water pouring operation, the operation is continued for only the time that has already elapsed before hot water heating operation. be done.

Further, in parallel with the temperature adjustment control in each of the above-mentioned operations, flow rate control by the hot water amount servo 17 is performed.

In this flow control, each thermistor and flow sensor 14
The actual maximum heating amount is calculated from the outlet temperature, incoming water temperature, and flow rate detected by the respective controllers and the control value of the burner group 3.3a at the time of operation. The maximum flow rate that can be supplied or filled with hot water is calculated from the above, and the opening degree is adjusted by controlling the hot water flow servo 17 so that this maximum flow rate is obtained.

This allows control to take advantage of the maximum capacity of each individual device, regardless of manufacturing variations.

As described above, the gas water heater with hot water filling function 1 of this embodiment
In this case, when hot water is supplied during hot water pouring operation, if the hot water supply temperature 'rset is 50°C or higher, it is detected by the hot water outlet temperature thermistor 16 based on the hot water supply temperature set by the remote controller. When the outlet temperature of the hot water drops to the switching temperature Ta which is 15°C higher than the hot water supply set temperature Tset, the hot water filling solenoid valve 25 is closed and the heat exchanger 10 is closed.
Since the heated hot water is supplied to the hot water supply pipe 18, the time until the hot water is supplied to the hot water supply pipe 18 is short. Therefore, hot water can be quickly supplied. At this time, the user
The temperature is set at a relatively high temperature of 50°C or higher, and it is anticipated that high-temperature hot water will be supplied, and precautions are taken to prevent burns, so there is little danger.

On the other hand, if the hot water supply temperature setting 1" set is lower than 50°C, hot water will not be supplied until the hot water temperature drops to 57°C or less, so high-temperature hot water will not be supplied. Therefore,
Even if you touch the supplied hot water with your hands, there is no need to worry about getting burned, and your safety can be ensured.

FIG. 9 shows switching temperature determination control according to a second embodiment of the present invention.

This is performed in place of steps 61 to 63 shown in FIG. A temperature higher than the set temperature is set as the switching temperature Ta (step 66), and if the set temperature is lower than 50 °C (NO in step 65), a temperature 10 °C higher than the set temperature is set as the switch temperature Ta (step 67).
).

As a result, when the set temperature is relatively low, compared to when the set temperature is high, switching is not performed until the outlet temperature drops considerably, so there is less danger of burns, etc., and it is safer.

In the above embodiments, the hot water to be supplied or refilled is
Although all of the water passes through the heat exchanger, a portion of the water in the water supply pipe may bypass the heat exchanger.

In the above embodiments, a gas-fueled burner was used as the heat source, but an oil-fueled burner or an electric heating source may also be used.

[Brief explanation of the drawing]

Figure 1 shows the hot water filling I of this example! FIG. 2 is a flowchart of the first embodiment regarding determination of the switching temperature in a gas water heater with function, FIG. FIG. 3 is a flowchart for explaining the control operation by the control device of this embodiment, FIG. 3 is a flowchart of hot water supply operation, FIG. 4 is a flowchart of automatic hot water filling operation, and FIG. 5 is a flowchart of valve opening control in automatic hot water filling operation. Flowchart, No. 6
Figure 7 is a flowchart of valve closing control in automatic hot water filling operation, Figure 7 is a flowchart of hot water pouring operation, Figure 8 is a characteristic diagram for explaining the switching temperature with respect to the hot water supply setting temperature in this embodiment, FIG. 9 is a flowchart regarding the determination of the switching temperature for explaining the second embodiment of the present invention. In the figure, 1... Gas water heater with hot water filling function, 3.3a,
・Burner group (heating means), 10... Heat exchanger, 15.
... hot water supply pipe (hot water supply circuit), 16 ... hot water supply temperature thermistor (temperature detection means), 18 ... hot water supply pipe, 19 ... hot water filling pipe, 22 ... water flow switch (hot water supply detection means), 25.
・Hot water filling solenoid valve (switching solenoid valve), 41... Bath remote control (high temperature water supply instruction means), 42... Main remote control (temperature setting means), B... Bathtub, Ta... Switching temperature . Ward 1

Claims (1)

[Scope of Claims] 1) A hot water supply pipe equipped with a faucet at the end that can be opened and closed by manual operation, and a hot water filling pipe equipped with a switching solenoid valve that controls the supply of hot water to the bathtub, In a water heater with a hot water filling function that is branched to an outflow part of a hot water supply circuit including a heat exchanger heated by a hot water supply means, high temperature water is supplied through the hot water filling pipe in response to an operation to the high temperature water supply instruction means. temperature setting means having a high-temperature water supply function for supplying hot water to the bathtub and setting a target temperature of hot water flowing out from the hot water supply circuit; temperature detection means detecting the temperature of hot water flowing out from the hot water supply circuit; hot water supply detection means for detecting hot water supply from the hot water supply pipe via the faucet during supply of high temperature water by the high temperature water supply function, and when hot water supply is detected by the hot water supply detection means, When the temperature detected by the temperature detection means reaches a switching temperature, the switching solenoid valve is closed, and when the set temperature of the temperature setting means is higher than a predetermined temperature, the switching temperature is set to a first value higher than the set temperature. The temperature is determined to be a certain amount higher,
A water heater with a hot water filling function, characterized in that when the temperature is lower than a predetermined temperature, the temperature is determined to be higher than the predetermined temperature by a second constant temperature. 2) A hot water supply pipe equipped with a water faucet at the end that can be opened and closed by manual operation, and a hot water supply pipe equipped with a switching solenoid valve that controls the supply of hot water to the bathtub, are heated by a heating means. In a water heater with a hot water filling function that is branched to an outflow part of a hot water supply circuit including an exchanger, the hot water is supplied to the bathtub via the hot water filling pipe in response to an operation on the high temperature water supply instruction means. a temperature setting means for setting a target temperature of hot water flowing out from the hot water supply circuit; a temperature detection means for detecting the temperature of hot water flowing out from the hot water supply circuit; hot water supply detection means for detecting hot water supply from the hot water supply pipe via the faucet during supply of high-temperature water, and when hot water supply is detected by the hot water supply detection means, the temperature detection means The switching solenoid valve is closed when the detected temperature reaches a switching temperature, and the switching temperature is higher than the set temperature by a first constant temperature when the set temperature of the temperature setting means is higher than a predetermined temperature. determined by the temperature,
If the temperature is lower than the predetermined temperature, the temperature is determined to be higher than the set temperature by a second constant temperature, and the second constant temperature is higher than the first temperature.
A water heater with a hot water filling function, characterized in that the temperature is set lower than a certain temperature.