JPH0735922B2 - Hot water heater with additional heating function - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water heater with a reheating function for automatically supplying hot water to a bathtub.

2. Description of the Related Art In recent years, a water heater with a reheating function has been developed that combines a water heater and a bathtub and combines a reheating machine that circulates hot water with a pump. The automation of baths such as added ones is progressing.

A conventional water heater with a reheating function will be described below with reference to the drawings. FIG. 3 shows a schematic diagram of the configuration of the conventional example. A heat exchanger 1 for hot water supply is connected to the water supply port 1a and the hot water supply port 1b. Reference numeral 2 is a heat exchanger for additional heating, which is connected to the hot water return port 2a and the hot water outlet port 2b. A pump 3 is provided in the hot water passage from the hot water return port 2a to the heat exchanger 2 for additional heating, and a bath 4 is connected to the hot water return port 2a and the hot water outlet port 2b by a connecting pipe 5 to form a hot water circulation passage. An exhaust stack 6 is connected to the heat exchangers 1 and 2, and a combustion exhaust gas is exhausted from an exhaust port 8 by an exhaust fan 7.
It is configured to be discharged to. An air supply port 9 is formed in a part of the case 10 so that combustion air can be supplied.
The fuel passage is branched from the original solenoid valve 11, one is connected to the hot water supply burner 14 through the hot water supply solenoid valve 12 and the proportional control valve 13, and the other is connected to the additional heating burner 16 through the additional heating solenoid valve 15. Are configured.

The hot water supply heat exchanger 1 is provided with a water supply detection element 17 that detects the supplied water in the water supply side passage and outputs a signal, and a hot water supply thermistor 18 is provided at the outlet of the hot water supply heat exchanger 1. The reheating heat exchanger 2 is provided with a circulating water detection element 19 for detecting circulation of hot water in a hot water side passage from the pump 3 to the reheating heat exchanger 2, and A thermistor 20 for reheating is installed at the entrance. Further, the hot water supply port 1b is connected to a hot water supply tap 21 in a bathroom or a kitchen through a hot water supply pipe 22,
It is connected to the bathtub 4 through a hot water supply control valve 24 for branching from the hot water supply pipe 22 to automatically supply hot water to the bathtub, an hopper 25 and an automatic hot water supply unit 23 having a water level sensor 26.

The water heater receives signals from the various sensors and controls an actuator (solenoid valve, pump, etc.) by a control circuit 27 and a remote controller 28.
Is configured to work with.

Next, the operation will be described. By opening the hot water tap 21, the water supply detection element 17 operates, and the original solenoid valve 11, the hot water solenoid valve 12,
The proportional control valve 13 is opened and the hot water supply burner 14 is ignited so that the hot water supply temperature according to the signal from the hot water supply thermistor 18 becomes the hot water supply temperature set by the hot water supply temperature setting device (not shown) of the remote controller 28. The proportional control valve 13 is operated with the output calculated by the control circuit 27 to control the combustion amount of the hot water supply burner 14 to stably control the hot water supply temperature.

On the other hand, by operating a reheating switch (not shown) provided on the remote controller 28, the pump 3 is operated to circulate the water or hot water previously stored in the bathtub 4, and the circulating water detecting element 19
To open the original solenoid valve 11 and the solenoid valve 15 for additional heating,
Ignite the additional burner 16. The bath boiling temperature is detected by the circulating hot water temperature and the signal from the additional heating thermistor 20 installed at the entrance of the additional heat exchanger 2 is set by the bathtub hot water temperature setting device (not shown) of the remote controller 28. To raise the temperature, the control circuit 27 is operated to operate the additional heating solenoid valve 15, the combustion amount of the additional heating burner 16 is controlled, and the circulating hot water is stably controlled,
Control the bath water temperature.

Further, when an automatic hot water supply switch (not shown) provided on the remote controller 28 is operated, a hot water supply control valve of the automatic hot water supply unit 23.
24 is opened, the proportional control valve 13 is operated by the output processed by the control circuit 27 so that the automatic hot water supply temperature set by the hot water supply hot water temperature setting device of the remote control 28 is reached, and the hot water supply burner 14 is operated.
By controlling the combustion amount of the hot water to stably control the hot water supply temperature, automatic hot water supply to the bathtub 4 and automatic temperature control of the bath temperature are realized.

Problems to be Solved by the Invention However, in the above-mentioned configuration, it is necessary to install the automatic hot water supply unit 23 in the immediate vicinity of the bathtub 4, and when the bathroom is located in the center of the room due to the configuration of the building, it is installed. It is not possible, and even if it can be installed on the wall side, there is a problem in the appearance and aesthetics of the building, and since the process from water supply to boiling is automated, the final work drainage cannot be done automatically. Had a point.

The present invention is to solve the above problems, to reduce the cost of the automatic hot water supply function, moreover, from the water supply to the boiling, also to the drainage of the final work is automated, installation-free, workability,
It is an object of the present invention to provide an aesthetically-effective water heater with a reheating function.

Means for Solving the Problems In order to solve the above-mentioned problems, the water heater with a reheating function of the present invention has a heat exchanger for hot water supply and a heat exchange for reheating having a hot water circulation passage connected to a bathtub by a pump. Water heater, a solenoid valve for hot water supply and a solenoid valve for heating, which are branched and connected from a proportional control valve connected in series to the original solenoid valve, and a thermistor for hot water supply and for heating water provided at the outlet of the heat exchanger for hot water supply. A reheating thermistor provided at the inlet of the heat exchanger, a bathtub automatic hot water supply passage having a hot water supply control valve that branches from the hot water supply passage downstream of the hot water supply thermistor and is connected to the bathtub, and that supplies hot water to the bathtub, An automatic drainage channel that branches off from the hot water circulation channel downstream of the heat exchanger for reheating and has a three-way electric valve for draining the water in the bathtub, and an automatic hot water channel for the bathtub provided at the bottom of the bathtub With one adapter connected to the hot water circulation for fire Equipped with
The hot water supply control valve is opened, and the proportional control valve is operated by the control signal calculated by the signal of the hot water supply thermistor to control the combustion amount of the hot water supply burner, and the signal of the hot water supply thermistor is automatically set. When the hot water supply set temperature is not reached, the pump is operated and the additional heating solenoid valve is opened to simultaneously burn the additional heating burner to automatically supply hot water to the bath.

With the above-described structure, the present invention operates the proportional control valve with the output calculated by the control circuit in response to the signal of the hot water supply thermistor to control the combustion amount of the hot water supply burner and stabilize the hot water supply temperature during the hot water supply operation. In addition to being able to control, the proportional control valve is operated by the output processed by the control circuit by the signal of the thermistor for additional heating during the additional heating operation.
By controlling the combustion amount of the additional heating burner, the bath water temperature can be stably controlled.

In the simultaneous operation, the control circuit preferentially operates the proportional control valve with the output processed in the hot water supply mode to control the hot water supply hot water temperature stably, and the heating side adds the signal from the heating thermistor. By controlling the opening and closing of the solenoid valve for heating, the bath water temperature can be controlled stably.

Furthermore, during the automatic hot water supply operation, the hot water supply control valve is opened to automatically supply hot water to the bathtub through the hot water supply heat exchanger, and the automatic hot water supply temperature is proportional to the output calculated by the control circuit using the signal from the hot water supply thermistor. The control valve is operated to control the combustion amount of the hot water supply burner to bring the bath water temperature to the desired bath boiling temperature without the additional heating operation and only by the automatic hot water supply operation.

If the signal from the thermistor for hot water supply does not reach the set temperature for automatic hot water supply during automatic hot water supply to the bathtub, the pump is operated and the solenoid valve for additional heating is opened to burn the additional heating burner at the same time. With an automatic hot water supply control circuit, the hot water from the bathtub automatic hot water supply channel and the hot water from the outlet of the reheating circulation channel are mixed and ejected by an adapter provided at the bottom of the bathtub to keep the hot water supply temperature to the bathtub constant. The hot water temperature distribution in the bathtub can be made uniform, and the thermistor for reheating can accurately detect the temperature in the bathtub, and the hot water bath temperature can be automatically supplied to the desired bath boiling temperature in a short time. .

Further, by switching the three-way motorized valve provided on the downstream side of the additional heat exchanger, the water after bathing can be automatically drained.

EXAMPLE An example of the present invention will be described below with reference to the schematic configuration diagram of FIG.
It will be described with reference to the flowchart of the automatic hot water supply operation shown in the figure. The heat exchanger 1 for hot water supply is connected to the water supply port 1a and the hot water supply port 1b as in FIG. 3, and is further connected at the outlet to the automatic hot water supply port 1c via the hot water supply control valve 31 and the safety valve 32. Water supply detection element that detects water supply to the side passage and outputs a signal (for example, a water amount sensor that counts the amount of water) 17
Have. The heat exchanger 2 for additional heating is connected to the hot water return port 2a and the hot water outlet port 2b as in FIG. 2, and at the outlet to the hot water outlet port 2b, the automatic drain port 2c is connected via the three-way motorized valve 33. It is connected to the. A pump 3 and a circulating water detection element 19 for detecting circulation of hot water are provided in a hot water side passage extending from the hot water return port 2a to the heat exchanger 2 for additional heating, and further, the hot water return port 2a and the hot water outlet port 2b are connected to the bathtub 4. The hot water circulation path is formed by connecting the adapter 34 provided on the bottom surface with the connection pipe 5, and the automatic hot water supply port 1c is connected by the connection pipe 35 to the adapter 34 to form the bathtub automatic hot water supply path.

Further, in the adapter 34, a heating return port 34b to the hot water circulation path is provided at the center of the heating water discharge port 24a from the hot water circulation path and the hot water supply port 34c from the bathtub automatic hot water supply passage, and each heating discharge port 34a and It is provided so as to be isolated from the hot water supply port 34c, and is configured to suck hot water in the upper part of the bathtub without being affected by the high-temperature hot water supplied from the additional heating outlet 34a and the hot water supply port 34c. There is.

An exhaust pipe 6 is connected to the heat exchangers 1 and 2, and a combustion exhaust gas is discharged to an exhaust port 8 by an exhaust fan 7. An air supply port 9 is formed in a part of the case 10 so that combustion air can be supplied.

The fuel passage passes through the original solenoid valve 11 and the proportional control valve 13, one is connected to the hot water supply solenoid valve 12 to the hot water supply burner 14, and the other is connected to the additional heating solenoid valve 15 to the additional heating burner 16 for proportional control. The valves 13 are commonly connected to each other.

The signal from the hot-water supply thermistor 18 provided at the outlet of the hot-water supply heat exchanger 1 was arithmetically processed by the control circuit 27 so as to reach the hot-water supply temperature set by the hot-water supply hot water temperature setting device (not shown) of the remote controller 28. The proportional control valve 13 is operated by the output to control the combustion amount of the hot water supply burner 14 to stably control the hot water temperature.

On the other hand, the signal from the additional heating thermistor 20 provided at the inlet of the additional heat exchanger 2 is a bathtub hot water temperature setting device (not shown) of the remote controller 28.
Control circuit so that the bath boiling temperature set by
With the output processed by 27, operate the proportional control valve 13,
The combustion amount of the additional heating burner 16 is controlled to stably control the circulating hot water, and the bath hot water temperature is controlled.

In addition, in order to speed up the rise of bath water temperature, the proportional control valve
The combustion amount of the heating burner 16 controlled by 13 is controlled with the maximum capacity without proportional control to the bath boiling temperature set by the bathtub hot water temperature setting device, and when the boiling temperature is reached, the electromagnetic heating for heating is controlled. The control circuit 27 is configured to close the valve 15. The hot water supply solenoid valve 12 and the reheating solenoid valve 15 are configured to open and close when the respective hot water temperatures are controlled.

During the simultaneous operation, the proportional control valve 13 is operated by the output preferentially calculated in the hot water supply mode by the control circuit 27 to stably control the hot water supply water temperature, and the additional heating side has the additional heating thermistor 20. By controlling the opening and closing of the additional heating solenoid valve 15 by the signal, the bath water temperature is stably controlled.

Further, during the automatic hot water supply operation, the bathtub automatic hot water supply passage provided with the hot water supply control valve 31 and the safety valve (vacuum breaker) 32 on the downstream side is branched from the downstream side of the hot water supply thermistor 18 to be operated. That is, the hot water supply control valve 31 is opened to pass the oil supply heat exchanger 1, the proportional control valve 13 is operated by the output processed by the control circuit 27 by the signal of the hot water supply thermistor 18, and the hot water supply burner 14 is operated. The hot water supply temperature is controlled stably by controlling the combustion amount of, and the hot water is automatically supplied to the bathtub 4. In addition, when the water temperature is low and the signal from the hot water supply thermistor 18 becomes lower than the automatic hot water supply set temperature when the water temperature is low, such as in winter, the pump 3 is operated and the circulating water detection element 19 is used for water flow. Detecting this, by opening the reheating solenoid valve 15 and burning the reheating burner 16 at the same time, it is possible to automatically heat the bath water temperature to the desired bath boiling temperature in a short time with large capacity. I am configuring. Further, the drainage after bathing is automatically drained by operating the pump 3 and switching the three-way solenoid valve 33.

The operation of the above configuration will be described. If, for example, the hot water supply tap 21 in the bathroom or kitchen is opened through the hot water supply pipe 22 connected to the hot water supply port 1b, the water supply detection element 17 detects the water supply and the hot water supply operation sequence operates, and the original solenoid valve 11 and the solenoid for hot water supply are operated. The valve 12 and the proportional control valve 13 are opened, the fuel is ignited and held (the ignition holding means is not shown), and the exhaust fan 7 is rotated. Then, the hot water supply burner 14 burns to heat the hot water supply heat exchanger 1, and the hot water is discharged from the hot water tap 21 through the hot water supply port 1b. The hot water supply thermistor 18 detects the hot water supply temperature, and the control circuit controls the temperature to reach the hot water supply temperature set by the hot water supply hot water temperature setting device on the remote controller 28.
The proportional control valve 13 is operated by the output calculated in 27 to control the combustion amount of the hot water supply burner 14 to stably control the hot water supply temperature.

On the other hand, when the additional heating switch (not shown) provided on the remote controller 28 is operated, the pump 3 and the exhaust fan 7 rotate. When hot water or water stored in advance in the bathtub 4 is circulated by the pump 3, the circulation detection element 19 detects and the reheating operation sequence operates, and the original solenoid valve 11, the reheating solenoid valve 15, and the proportional control valve. The valve 13 is opened and the fuel is ignited and held (the ignition holding means is not particularly shown). Then, the additional heating burner 15 burns to heat the additional heating heat exchanger 2, and the hot water outlet 2b to the connecting pipe 5,
The hot water circulated in the bathtub 4 through the adapter 34 is a hot water return port.
Returned to 2a. The signal of the additional heating thermistor 20 which detected circulating hot water equal to the hot water temperature in the bathtub 4 was arithmetically processed by the control circuit 27 so that the bath boiling temperature set by the bathtub hot water temperature setting device of the remote controller 28 was reached. The proportional control valve 13 is operated by the output to control the combustion amount of the additional burner 16 to stably control the circulating hot water to control the bath water temperature.

Further, when the automatic hot water supply operation switch provided on the remote controller 28 is operated, the hot water supply control valve 31 is opened, and the connection pipe 35 for automatic hot water supply is passed from the automatic hot water supply port 1c through the hot water supply heat exchanger 1 to the adapter. Automatic hot water supply to bathtub 4 from 34. That is,
The water supply detection element 17 detects the water supply and the automatic hot water supply operation sequence operates to open the original solenoid valve 11, the solenoid valve 12 for hot water supply, and the proportional control valve 13 to keep the fuel ignited and held, and the exhaust fan 7 operates. Rotate. Then, the hot water supply burner 14 burns to heat the hot water supply exchanger 1 to automatically supply hot water to the bathtub 4 from the automatic hot water supply port 1c. The hot water supply temperature is the thermistor for hot water supply
The proportional control valve 13 is operated with the output processed by the control circuit 27 so that the hot water supply temperature set by the bath water temperature setting device of the remote controller 28 is detected by 18, and the combustion amount of the hot water supply burner 14 is changed. The hot water supply temperature is controlled stably to automatically supply hot water to the bathtub 4. By doing so, it is possible to complete the operation only by the automatic hot water supply operation without performing the operation of heating the desired bath boiling temperature.

Also, when the water temperature is low, such as in winter, when the signal from the hot water supply thermistor 18 becomes lower than the automatic hot water supply set temperature due to the hot water supply capacity being exceeded, the pump 3 is operated and the reheating solenoid valve 15 is also operated. The heating burner 16 is opened at the same time, and the heating burner 16 is also burned at the same time, and the heating thermistor 20 provided on the upstream side of the heating heat exchanger 2 senses the temperature of the hot water in the bathtub 4 to turn on the heating solenoid valve 15. By opening and closing and performing automatic hot water supply and reheating operation at the same time, the bath water temperature to the bathtub 4 is set to a desired value so that the hot water supply temperature set by the bathtub hot water temperature setting device of the remote controller 28 can be achieved in a short time with large capacity. The bath can be heated to the boiling temperature for automatic hot water supply.

As for the amount of water supplied to the bath tub 4, a water amount sensor that counts the amount of water supplied is used in the water supply detection element 17, so the amount of ignition / digested water is detected, and the hot water supply control valve 31 is automatically closed to automatically supply hot water. You can stop. In addition, the amount of water to start the additional heating operation when the hot water supply capacity is exceeded is stored in the control circuit 27 in advance, and by the signal from the water amount sensor,
Reheating operation with the amount of water below the position of the adapter 34,
That is, the idle operation of the pump 3 can be prevented.

The safety valve 29 is for preventing backflow from the bathtub circulation path to the hot water supply circuit when the automatic hot water supply operation is stopped.

For drainage after bathing, a three-way motorized valve 33 is operated by operating a drain switch (not shown) of the remote controller 28.
, And the pump 3 is operated to drain the water in the bathtub 4 from the automatic drain port 2c. When the circulating water detecting element 19 detects that the water in the bathtub 4 has been completely drained, the three-way electric valve 33 and the pump 3 can be stopped at the same time, and the draining work can be remotely controlled.

Effects of the Invention As described above, the present invention has the following effects.

(1) For both hot water supply and additional heating, one proportional control valve controls the combustion amount proportionally to control the hot water temperature, so that the hot water temperature can be stabilized.

(2) Especially, since the bath water temperature can be controlled by proportional control by automatic hot water supply, the conventional Hi-Lo-OFF or ON-OFF
Energy saving can be achieved as compared with hot water temperature control.

(3) Since the main body has an automatic hot water supply function, the cost can be reduced, the installation can be made free, the workability can be improved, and the aesthetic appearance of the building will not be impaired.

(4) Bath heating time can be completed only by automatic hot water supply operation without additional heating operation to the desired bath boiling temperature, and there is no need for additional heating operation after automatic hot water supply as in the past. It becomes shorter and you can live in a bath that is economically comfortable.

(5) If the signal from the hot water supply thermistor becomes lower than the automatic hot water supply set temperature due to the hot water supply capacity being exceeded when the water temperature is low, such as in winter, the pump is operated and the additional heating solenoid valve is also opened. Then, the burner for additional heating is also burned to perform automatic hot water supply and additional heating at the same time, so that the bath water temperature can be automatically supplied to the desired bath boiling temperature in a short time with a large capacity. In addition, the automatic hot water supply port and the connection of the additional heating port to the bathtub can be collected at one place with the adapter at the bottom of the bathtub, and the mixed hot water can be jetted to the lower part of the bathtub to make the bathtub temperature uniform. .

(6) Since the connection to the bathtub is at the bottom and the drainage function is provided in the equipment, the drainage port of the bathtub itself is not required and the conventional bathtub drainage port can be used as the adapter connection port, so that the adapter can be attached to the bathtub. No need to drill holes.

(7) A fully automatic water heater with a reheating function can be obtained in which the water in the bathtub can be drained remotely and the processes from water supply to boiling and drainage are automated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a flowchart diagram during the automatic hot water supply operation, and FIG. 3 is a schematic configuration diagram of a conventional example. 1 ... Heat exchanger for hot water supply, 2 ... Heat exchanger for additional heating, 3 ...
Pump, 4 ... Bathtub, 11 ... Original solenoid valve, 12 ... Hot water solenoid valve, 13 ... Proportional control valve, 14 ... Hot water burner, 15 ...
Solenoid valve for reheating, 16 ... Burner for reheating, 17 ... Water supply detecting element, 18 ... Hot water supply thermistor, 19 ... Circulating water detecting element,
20 …… Additional thermistor, 31 …… Hot water supply control valve, 33 …… Three-way motorized valve, 34 …… Adapter

Claims (1)

[Claims] 1. A hot-water supply heat exchanger having a hot-water circulation path pumped to a hot-water supply heat exchanger and a bathtub, and a hot-water supply branching from a proportional control valve serially connected to the original solenoid valve. A solenoid valve and an additional heating solenoid valve, a hot water supply thermistor provided at the outlet of the hot water supply heat exchanger and an additional heating thermistor provided at the inlet of the additional heat supply heat exchanger, and hot water supply downstream of the hot water supply thermistor. The water in the bathtub is branched from the passage to be connected to the bathtub and branched from the bathtub automatic hot water supply passage having a hot water supply control valve for supplying hot water to the bathtub and the hot water circulation passage downstream of the additional heat exchanger. The hot water supply control valve is provided with an automatic drainage path having a three-way motorized valve for draining water, and one adapter provided at the bottom of the bathtub and connected to the bathtub automatic hot water supply path and the hot water circulation path for additional heating. Open the valve and calculate with the signal from the hot water supply thermistor The proportional control valve is operated by the controlled control signal to control the combustion amount of the hot water supply burner, and when the signal of the hot water supply thermistor does not reach the automatic hot water supply temperature, the pump is operated and the additional heating is performed. A water heater with a reheating function, which is configured to open a solenoid valve for combustion to burn the reheating burner at the same time to automatically supply hot water to a bathtub.