JPH1073312A - 1 boiler/2 channel bath water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a 1 boiler/2 channel bath water heater which can avoid the deviation of hot water filling temperature of a bathtub from the target hot water filling temperature. SOLUTION: A solenoid valve 32 is provided on a pipeline 16 between an outgoing connection part A of a hot water filling path 24 and the incoming side of a reheating heat exchanger 3 and a controller 27 is provided with a shielding valve control section. The shielding valve control section closes the solenoid valve 33 during the filling with hot water. The hot water generated by a hot water supply heat exchanger 2 passes through a water pipe 14 and a hot water filling path 24 and all of hot water drops into a bathtub 18 through a return pipe 20. This keeps a part of hot water passing through the hot water filling path 24 from penetrating into a reheating heat exchanger 3 through the pipeline 16 eventually being reheated. This accurately prevents the deviation to a higher position of the hot water filling temperature from the target temperature otherwise caused by the reheating of filled hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-channel bath water heater having a function of reheating a bath, a function of filling a bathtub, and a function of supplying hot water.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a system configuration of a 1-can 2-channel bath water heater developed by the applicant. In FIG. 1, a hot water supply heat exchanger 2 and a reheating heat exchanger 3 are integrally disposed in an appliance case 1. That is, a hot water supply heat exchanger 2 is formed by penetrating a plurality of common fin plates 4 with hot water supply-side pipes. It is three.

A burner 5 for heating the hot water supply heat exchanger 2 and the reheating heat exchanger 3 in common is disposed below these integrated heat exchangers. The combustion fan 9 to be performed is arranged on the lower side. A gas passage 6 is connected to the burner 5. The gas passage 6 is provided with solenoid valves 7 and 8 for opening and closing the passage and a proportional valve 10 for controlling a gas supply amount (burner combustion heat amount) by a valve opening amount. Is interposed. The control of the valve opening amount of the proportional valve 10 is specifically performed by controlling the current applied to the proportional valve 10 (valve opening drive current).
The variable control is performed.

A water supply pipe 11 functioning as a water supply passage is connected to the inlet side of the hot water supply heat exchanger 2.
Are provided with a water supply temperature detection sensor 12 for detecting a water supply temperature, and a flow rate detection sensor 13 for detecting a water supply flow rate (in the case of hot water, a hot water flow rate). The inlet side of the water supply pipe 11 is connected to a water pipe.

[0005] A hot water supply pipe 14 is connected to the outlet side of the hot water supply heat exchanger 2, and the hot water supply pipe 14 is led to a desired hot water supply place such as a kitchen through an external pipe. A hot water supply temperature sensor for detecting a hot water supply temperature is provided in a flow path on an outlet side of the hot water supply heat exchanger 2.
15 are provided.

A line 16 is provided on the inlet side of the reheater 3.
Is connected, and the other end of the pipeline 16 is connected to the discharge side of the circulation pump 17. The suction side of the circulation pump 17 and the bathtub 18 are connected by a return pipe 20, and the return pipe 20 is provided with a bath temperature sensor 21 for detecting the temperature of the circulating hot and cold water in the bathtub 18 as a bath temperature. One end of an outgoing pipe 22 is connected to the outlet side of the reheating heat exchanger 3, and the other end of the outgoing pipe 22 is connected to a bathtub 18. The passage leading to the bath 18 via the pipe line 16, the reheating heat exchanger 3 and the outgoing pipe 22 constitutes a reheating circulation passage 23.

The hot-water supply pipe 14 of the hot-water supply heat exchanger 2 functions as a hot-water supply passage, and the hot-water supply pipe 14 and the additional heating circulation passage 23 (the pipe 16 in FIG. 3) are connected to each other by a hot-water filling passage 24. A pouring valve 25 constituted by an electromagnetic valve or the like for opening and closing the passage is interposed in the hot water filling passage 24, and the hot water filling passage 24 downstream of the hot water filling valve 25 is provided with a water level of the bathtub 18. Is provided with a water level sensor (pressure sensor) 26 for detecting the water level.

The flow rate detecting sensor 13, the temperature sensors 12, 1
Sensor detection signals from 5, 21 and water level sensor 26
The controller 27 is connected to a remote controller 28. This remote controller 28 has a hot water supply temperature setting means for setting the hot water supply temperature, a bath temperature setting means for setting the bath temperature, a hot water command button 38 for instructing hot water operation,
A display unit or the like for displaying necessary information is provided.

The control device 27 takes in various sensor detection signals and information of the remote controller 28, and performs hot water supply operation, hot water filling operation,
The reheating operation is controlled as follows.

For example, a faucet in a hot water supply passage led to a kitchen or the like.
When the opening 30 is opened and the operating flow rate is detected by the flow rate detection sensor 13, the combustion fan 9 is rotated, and the solenoid valves 7, 8 are rotated.
Is performed, fuel gas is supplied to the burner 5, and the burner 5 is burned by a point ignition means (not shown), and the hot water temperature detected by the hot water temperature sensor 15 is set by the remote controller 28. Control the valve-opening drive current to the proportional valve 10 so as to match the set hot water supply temperature, and heat the water passing through the hot water supply heat exchanger 2 with the flame of the burner 5 to produce hot water at the set temperature. Hot water is supplied to the hot water supply place via the pipe 14.

When the faucet 30 is closed and the off signal is output from the flow rate detection sensor 13, the burner combustion is stopped and the operation in the hot water supply operation mode is ended.

When the hot water filling mode is commanded by the remote controller 28, the pouring valve 25 is opened. When the operation flow rate is detected by the flow rate detection sensor 13, the combustion of the burner 5 starts as in the case of the hot water supply operation, and the hot water generated by the hot water supply heat exchanger 2 passes through the hot water supply pipe 14 and the hot water filling passage 24. Street,
Further, the tub 18 is branched from the pipe 16 through the reheating heat exchanger 3, the passage passing through the outgoing pipe 22 and the passage passing through the return pipe 20.
The hot water is dropped in. Then, when the amount of hot water drops to the set water level or when the set water level is detected by the water level sensor 26, the pouring valve 25 is closed, the combustion of the burner 5 is stopped, and the operation in the filling operation mode is performed. Ends.

In the operation in the reheating operation mode, the circulation pump 17 is driven to rotate while the pouring valve 25 is closed, and the circulation of hot water in the bathtub 18 is performed through the reheating circulation passage 23. The bath temperature of the bathtub is detected by the bath temperature sensor 21. When the detected bath temperature is lower than the set bath temperature, the burner 5 is burned, and the bath water circulated through the reheating circulation passage 23 is heated by the reheating heat exchanger 3. When the bath temperature sensor 21 detects that the temperature of the bath water reaches the set bath temperature, the circulation pump 17 and the burner 5 are stopped, and the operation in the reheating operation mode ends.

As described above, the 1-can 2-channel water bath water heater is of a type in which the integrated hot water supply heat exchanger 2 and the reheating heat exchanger 3 are heated by using the common burner 5, so that they are provided separately. In comparison with the method of burning and heating the hot water supply heat exchanger and the reheating heat exchanger using separate burners, the system configuration can be simplified, and accordingly, the size of the system (apparatus) can be reduced and the cost can be reduced. Will be.

[0015]

However, one can 2
In the case of a water bath water heater, when hot water is supplied to the bathtub 18, when hot water having a bath set temperature is produced by the hot water supply heat exchanger 2 and dropped into the bathtub 18, part of the hot water passing through the hot water passage 24 is piped. Since it is dropped from the side of the road 16 into the bathtub 18 via the reheating heat exchanger 3, it is reheated by the combustion flame of the burner 5 again when passing through the reheating heat exchanger 3,
Since the temperature is lowered to 18, the temperature of the hot water in the bathtub becomes higher than the bath set temperature, and the hot water temperature of the bathtub deviates from the target temperature.

Various means have been proposed to eliminate such a difference in bathtub filling temperature. But,
Due to the very complicated control configuration and the huge amount of control data that must be given in advance, there is still a satisfactory means to solve the above-mentioned bath tub filling temperature deviation problem. Not been.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a one-can-two-water-channel which can avoid the problem of bathtub filling temperature deviation with a simple control configuration and system configuration. To provide a bath water heater.

[0018]

In order to achieve the above-mentioned object, the present invention has the following structure to solve the above-mentioned problems. That is, the present invention relates to a hot water supply heat exchanger that heats water supplied from a water supply passage and sends it out to the hot water supply passage, and a reheating heat exchanger that is incorporated in the reheating circulation circuit of the bathtub hot water and reheats the circulating hot water. And a common burner for heating the integrated hot water supply heat exchanger and the additional heating heat exchanger, and the hot water supply passage and the additional heating circulation passage are connected by a hot water supply passage through a pouring valve. The hot water created by the hot water supply heat exchanger is opened from the hot water supply passage, and the hot water is allowed to enter the refueling circulation passage through the hot water filling passage, and the hot water is reheated to the bathtub through the heat exchanger. In a 1-can 2-channel bath water heater of the type in which the water is diverted into the path to the bathtub without passing through the reheating heat exchanger and dropped into the bathtub, the water flows into the reheating heat exchanger from the hot-water passage. Block the hot water A shut-off valve is provided in the additional heating circulation passage, and a shut-off valve control unit that shuts off the flow of hot water from the hot filling passage to the secondary heat exchanger by causing the shut-off valve to perform a shut-off operation at the time of filling. The configuration provided as a means for solving the above-mentioned problem.

In the present invention having the above-described structure, for example, the shut-off valve is constituted by an electromagnetic valve, and is provided on the path of the refilling circulation passage for the filling water from the outlet side of the filling passage to the reheating heat exchanger. . The shutoff valve control unit closes the solenoid valve when filling, and shuts off the flow of the filling water from the filling passage to the reheating heat exchanger.

By doing so, at the time of hot water filling, the hot water produced by the hot water supply heat exchanger passes through the hot water supply passage and the hot water filling passage, and all the hot water is dropped into the bathtub without passing through the reheater. In other words, the hot water of the hot water created by the hot water supply heat exchanger will not flow into the reheating heat exchanger,
A part of the hot water is prevented from being reheated by the reheating heat exchanger, and the problem of the temperature difference of the hot water caused by the reheating is completely avoided.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. What is characteristic in this embodiment is that, as shown by the dotted lines in FIGS. 1 and 3, the connection portion A between the hot water supply passage 24 and the pipe line 16 and the inlet side of the reheating heat exchanger 3. An electromagnetic valve 32, which is a shutoff valve, is provided in between, and the control device 27 is provided with a control unit for controlling the opening and closing of the electromagnetic valve 32 so as to close the electromagnetic valve 32 at the time of filling. This is a configuration for avoiding the problem of a difference in filling temperature caused by reheating of hot water. The other configuration is the same as the configuration in FIG. 3 described above, and thus redundant description will be omitted.

FIG. 2 shows an example of a control device 27 having a shut-off valve control section for controlling the opening and closing of the solenoid valve 32 which is unique to the present embodiment. The control device 27 includes a combustion control unit 34 and a shutoff valve control unit 35, as shown in FIG.

The combustion control unit 34 is provided with a sequence program for operation such as hot water supply, hot water filling, reheating, etc., and the combustion control unit 34 includes various sensor detection signals such as the flow rate detection sensor 13 and the like, , And controls operations such as hot water supply, hot water filling, reheating, and the like according to the sequence program.

The shut-off valve control unit 35 includes a filling operation monitoring unit 36 and an opening / closing control unit 37. Hot water operation monitoring section
36 is to take the information of the remote controller 28 and monitor whether or not the user of the water heater has issued a command to start the filling operation using the filling command button 38, so that the filling operation is started. Monitor whether it is.

The opening / closing control unit 37 is provided with the hot water filling operation monitoring unit 36.
When it is detected that the filling operation is started based on the monitoring information, a valve closing signal for closing the solenoid valve 32 is output, and the solenoid valve 32 is closed.

By doing so, at the time of hot water filling operation, the hot water produced by the hot water supply heat exchanger 2 passes through the hot water supply pipe 14 and the hot water filling passage 24 to enter the additional heating circulation passage 23 (pipe line 16), and Hot water is dropped into bathtub 18 through return pipe 20. In other words, the flow of the hot water flowing from the hot water passage 24 into the reheating heat exchanger 3 via the pipe 16 is controlled by the solenoid valve.
As described above, all of the hot water that has been shut off by the valve closing operation of 32 and has entered the reheating circulation passage 23 is dropped into the bathtub 18 through the return pipe 20 and passes through the reheating heat exchanger 3. Absent.

For this reason, at the time of hot water filling, it is possible to prevent a part of the hot water created by the hot water supply heat exchanger 2 from being reheated through the reheating heat exchanger 3, and the hot water hot water can be avoided. The problem of the bath tub filling temperature deviation caused by the reheating can be completely solved.

The filling operation monitoring unit 36 receives information on the control operation of the combustion control unit 34 and monitors whether the filling operation is being performed. For example, since the injection valve 25 is opened only during filling, the combustion control unit 34 supplies the injection valve 25.
By monitoring whether or not a signal for opening the valve has been output, it is monitored whether or not the hot water filling operation is being performed.

The opening / closing control section 37 takes in the monitoring information of the filling operation monitoring section 36 and, when detecting that the filling operation has been completed based on the monitoring information, opens the solenoid valve 32. A signal is output, and the solenoid valve 32 is opened.

As described above, the solenoid valve 32 is a normally open on-off valve that is closed only by filling with the shutoff valve control unit 35.

According to this embodiment, the solenoid valve 32 is provided in the reheating circulation passage 23 (pipe 16) between the hot water passage outlet connection portion A and the inlet of the reheating heat exchanger 3. The shut-off valve control unit 35 that closes the solenoid valve 32 during filling is controlled by the control device 27.
The electromagnetic valve 32 can be closed during filling, and the closing operation of the solenoid valve 32 shuts off the flow of filling water flowing from the filling passage 24 to the reheater 3. Then, all the hot water flowing out of the hot water passage 24 to the reheating circulation passage 23 is dropped into the bath 18 through the return pipe 20.

Therefore, a part of the hot water of the hot water does not flow from the hot water passage 24 to the additional heat exchanger 3, and a part of the hot water of the hot water is reheated in the additional heat exchanger 3. Can be prevented, and the problem of bathtub filling temperature deviation due to reheating of bathing water can be reliably avoided.

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 filling operation monitoring unit 36 monitors whether or not the filling operation is started based on the command information of the filling command button 38 of the remote controller 28. Whether or not the filling operation is started may be monitored based on the information on the control operation of the section 34 (for example, the operation information of the filling program of the filling system or the opening operation information of the filling valve 25). .

In the above embodiment, the shut-off valve is constituted by an electromagnetic valve, but may be constituted by a three-way valve. In this case, the hot water passage 24 and the reheating circulation passage 23
A three-way valve is provided at the connection A of the (pipe line 16), and the shutoff valve control unit 35 supplies the hot water of the hot water flowing from the hot water passage 24 to the return pipe 20 side via the three-way valve at the time of hot water filling. Side, and at other times, the three-way valve is switched to the reheating side where the recirculating water flows from the return pipe 20 to the reheating heat exchanger 3 via the line 16 and the three-way valve. You. Also in this case, similarly to the above-described embodiment, it is possible to avoid the problem of the bathtub filling temperature deviation due to the reheating of the filling water.

[0035]

According to the present invention, the shut-off valve and the shut-off valve control unit are provided, and the shut-off valve is closed at the time of filling, thereby shutting off the flow of hot water from the hot-water passage to the reheating heat exchanger. So that the hot water of the hot water created by the hot water supply heat exchanger passes through the hot water passage and enters the reheating circulation path, and all the hot water is dropped into the bathtub without passing through the reheating heat exchanger. . In other words, part of the hot water does not flow into the additional heat exchanger and is not reheated, so that the problem of the temperature difference of the hot water caused by the reheating of the hot water can be completely avoided. it can. Moreover, the configuration is very simple.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a specific arrangement portion of a shutoff valve in an embodiment of the present invention.

FIG. 2 is a block diagram showing a main control configuration of a one-can-two-channel bath water heater of the embodiment.

FIG. 3 is a model diagram showing an example of a one-can-two-canal bath water heater.

[Explanation of symbols]

 2 Heat supply heat exchanger 3 Reheating heat exchanger 5 Burner 23 Reheating circulation passage 24 Filling passage 32 Solenoid valve 35 Shut-off valve control unit

Claims (1)

[Claims] 1. A hot water supply heat exchanger for heating water supplied from a water supply passage and sending it out to the hot water supply passage, and a reheating heat exchanger incorporated in the reheating circulation passage of the bathtub hot water for reheating the circulating hot water. Is provided with a common burner for heating the integrated hot water supply heat exchanger and the additional heating heat exchanger, and the hot water supply passage and the additional heating circulation passage are connected by a filling line through a filling valve. Opening the pouring valve and letting the hot water created by the hot water supply heat exchanger enter the reheating cycle from the hot water supply passage through the hot water filling passage, and then pass the hot water through the heat exchanger to the bathtub, In a 1-can 2-channel bath water heater of the type where hot water is diverted to the path to the bathtub without passing through the reheating heat exchanger and dropped into the bathtub, hot water flows from the hot water passage to the reheating heat exchanger. Shut off to block hot water A valve is provided in the reheating circulation path, and a shutoff valve control unit is provided for shutting off the flow of the hot water from the hot filling passage to the reheating heat exchanger by causing the shutoff valve to perform a shutoff operation during hot water filling. A 1-can 2-channel bath water heater characterized by having a configuration.