JPH0745970B2 - 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. When the hot water supply tap 21 is opened, the water supply detecting element 17 operates, the original solenoid valve 11, the hot water supply solenoid valve 12 and the proportional control valve 13 are opened, the hot water supply burner 14 is ignited, and the signal of the hot water supply thermistor 18 is output. The proportional control valve with the output processed by the control circuit 27 so that the hot water discharge temperature by the hot water supply temperature set by the hot water supply hot water temperature setting device (not shown) of the remote controller 28
13 is operated 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. In order 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 passed away, 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 configuration, it is necessary to install the automatic hot water supply unit 23 in the immediate vicinity of the bathtub 4, and due to the configuration of the building, installation is not possible when the bathroom is in the center of the room. It is not possible, and even if it can be installed on the wall side, it is a problem in appearance and aesthetics of the building, and there is a problem in that holes for pipe connections in the bathtub must be machined at specified positions. Had.

The present invention solves the above problems, and an object of the present invention is to provide a water heater with a reheating function that is cost-effective and installation-free and is effective in terms of workability and aesthetics.

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 having a three-way electric valve for branching from the hot water circulation channel downstream of the heat exchanger for additional heating to drain the water in the bathtub,
A cleaning agent supply path having a cleaning agent injection solenoid valve that joins the warm water circulation path upstream of the pump and injects the cleaning agent in the cleaning agent tank into the warm water circulation path, and the bathtub provided at the bottom of the bathtub. An automatic hot water supply passage and a single adapter connected to the hot water circulation passage for additional heating are provided, the hot water supply control valve is opened, and the proportional control valve is operated by a control signal arithmetically processed by the signal of the hot water supply thermistor. When the signal from the hot water supply thermistor does not reach the automatic hot water supply set temperature, the burner is operated to control the combustion amount of the hot water supply burner, and the pump is operated and the additional heating solenoid valve is opened to perform the additional operation. It is configured such that the burning burners are simultaneously burned to automatically supply hot water to the bathtub.

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 hot water supply thermistor does not reach the automatic hot water supply set temperature during automatic hot water supply to the bathtub, operate the pump,
Equipped with an automatic hot water supply control circuit for the bathtub that opens the additional heating solenoid valve and burns the additional heating burner at the same time, so that hot water from the bathtub automatic hot water supply channel and hot water from the outlet of the additional heating circuit can be bathed Mixing and ejecting with the adapter provided at the bottom, making the hot water supply temperature to the bathtub uniform and making the hot water temperature distribution in the bathtub uniform, the thermistor for additional heating can accurately detect the temperature in the bathtub,
The bath water temperature can be automatically supplied to the desired bath boiling temperature in a short time.

Furthermore, after the bath, the bathtub is washed by injecting the detergent in the detergent tank provided on the upstream side of the pump into the hot water circulation path using the suction force of the pump by opening the detergent injection solenoid valve. . The injected cleaning agent can be washed by a pump while circulating between the hot water circulation path and the bath. Further, by switching the three-way solenoid valve provided on the downstream side of the heat exchanger for additional heating, the water after cleaning 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 in the same manner as in FIG. 3, and further at the outlet,
A water supply detection element that is connected to the automatic hot water supply port 1c via a hot water supply control valve 31 and a safety valve 32, and outputs a signal by detecting water supply in the water supply side passage (for example, a water amount sensor that counts the amount of water)
Have 17. 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 is connected to 2c via the three-way solenoid valve 33 at the outlet to the hot water outlet port 2b. There is. A pump 3 and a circulating water detecting 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 a hot water side passage between the hot water return port 2a and the pump 3. A cleaning agent tank 34 is connected to the cleaning agent tank 34 via a cleaning agent injection solenoid valve 35. In addition, the hot water return port 2a and the hot water outlet port
2b is connected to an adapter 36 provided on the bottom surface of the bathtub 4 with a connection pipe 5 to form a hot water circulation path, and the automatic hot water supply port 1c is connected to the adapter 36 with a connection pipe 37 to form an automatic bathtub hot water supply path. In addition, the adapter 36 is a return port 36b for additional heating to the hot water circulation path.
Is located in the center of the hot water circulation passage 36a for hot water circulation and the hot water supply port 36c for the bathtub automatic hot water supply passage.
It is installed so as to be isolated from the
The hot water in the upper part of the bathtub is sucked in without being affected by the hot water supplied from the hot water supply port 36c.

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 open 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 through the hot water supply heat exchanger 1, and 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 to operate the hot water supply burner 14. The hot water supply temperature is controlled stably by controlling the combustion amount, and the hot water supply to the bathtub 4 is automatically performed. 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. Furthermore, after washing the bath, the bath 4 is cleaned by using the suction force of the pump by opening the detergent injection solenoid valve 35 to inject the detergent in the detergent tank 34 provided on the upstream side of the pump 3 into the hot water circulation path. Inject and do. The injected cleaning agent is circulated between the hot water circulation path and the bathtub 4 by the pump 3 to wash the inside of the bathtub 4. The wastewater after cleaning the bathtub 4 is automatically drained by operating the pump 3 and switching the three-way electric 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 27 controls the temperature to reach the hot water supply temperature set by the hot water supply temperature setting device of the remote controller 28.
The proportional control valve 13 is operated by the output calculated in the above step to control the combustion amount of the hot water supply burner 14 to stably control the hot water 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 to hold the fuel in ignition (ignition holding means is not shown). Then, the additional heating burner 15 burns to heat the additional heating heat exchanger 2, and the hot water circulated in the bathtub 4 from the hot water outlet 2b through the connecting pipe 5 and the adapter 36 is returned to the hot water return port 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.

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 hot water heat exchanger 1 is passed from the automatic hot water supply port 1c through the connection pipe 37 for automatic hot water supply from the adapter 36. Automatic hot water supply to bathtub 4. That is, the water supply detecting 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 hold the exhaust fan. 7 rotates. 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 proportional hot water supply temperature is detected by the hot water supply thermistor 18, and the proportional control valve 13 is operated by the output calculated by the control circuit 27 so that the hot water supply temperature set by the bathtub hot water temperature setting device of the remote controller 28 is reached. The amount of combustion of the burner 14 is controlled to stably control the hot water temperature to 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.

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 additional heating solenoid valve is operated.
15 is also opened to burn the heating burner 16 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 and the heating solenoid valve By opening and closing 15 and performing automatic hot water supply and additional heating at the same time, the bath water temperature to the bathtub 4 is controlled so that the hot water temperature set by the bath water temperature setting device of the remote control 28 can be achieved in a short time with large capacity. The hot water can be automatically supplied at the bath heating temperature of the period.

The amount of water supplied to the molten metal 4 uses a water amount sensor that counts the amount of water supplied to the water supply detection element 17. Therefore, the amount of ignition / extinction water is detected, and the hot water supply control valve 31 is automatically opened 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 36,
That is, the idle operation of the pump 3 can be prevented.

The safety valve 32 is for preventing backflow from the bathtub circulation path to the hot water supply circuit when the automatic hot water supply operation is stopped.

Further, by operating a cleaning switch (not shown) of the remote controller 28, the cleaning agent injection electromagnetic valve 34 is opened, the pump 3 is operated, and the suction force of the pump 3 is used to remove the cleaning agent in the cleaning agent tank 34. While pouring into the hot water circulation path and circulating between the hot water circulation path and the bathtub 4, the inside of the bathtub 4 is washed, and the dirty water after washing is drained from the automatic drain port 2c by switching the three-way electric valve 32, 4. The circulating water detecting element 19 detects that the internal water has been completely drained, and the three-way motorized valve 32 and the pump 3 are stopped at the same time. Thus, the washing of the bathtub and the drainage of the dirty water in the bathtub are remotely controlled. can do.

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, by burning the additional heating burner and performing the automatic hot water supply and the additional heating operation at the same time, the hot water of the bathtub 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 for drilling.

(7) By injecting a cleaning agent into the hot water circulation path, the bathtub can be cleaned automatically simply by circulating the pump.

(8) It is a fully-automatic water heater with a reheating function that allows remote drainage of bath water, boiling from water supply, washing the bath after bathing, and draining.

[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 heating thermistor, 31 …… hot water supply control valve, 33 …… three-way motorized valve, 34 …… cleaning agent tank, 35 …… cleaning agent injection solenoid valve, 36 …… 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. Water is drained from the bathtub by branching from the passage and being connected to the bathtub and having a bathtub automatic hot water supply passage having a hot water supply control valve for supplying hot water to the bathtub and a hot water circulation passage downstream of the heat exchanger for additional heating. A cleaning agent having an automatic drainage channel having a three-way motorized valve for cleaning and a cleaning agent injection solenoid valve that joins the warm water circulation path upstream of the pump and injects the cleaning agent in the cleaning agent tank into the warm water circulator The bath is provided at the supply channel and at the bottom of the bath. An automatic hot water supply passage and a single adapter connected to the hot water circulation passage for additional heating are provided, the hot water supply control valve is opened, and the proportional control valve is operated by a control signal arithmetically processed by the signal of the hot water supply thermistor. When the signal from the hot water supply thermistor does not reach the automatic hot water supply set temperature, the burner is operated to control the combustion amount of the hot water supply burner, and the pump is operated and the additional heating solenoid valve is opened to perform the additional operation. A water heater with a reheating function that is configured to burn the heating burner at the same time to automatically supply hot water to the bathtub.