JPS6315032A - Hot water supplier with additional burning apparatus - Google Patents

Abstract

PURPOSE:To lower the cost for an automatic hot water supplying function by supplying water from a hot water supplying heat exchanger to a tank provided at a part of a hot water circulation circuit and opening a tank opening and closing valve to actuate a pump. CONSTITUTION:At the time of an automatic hot water supply operation, a hot water supply control valve 24 is opened, whereby a water quantity sensor 29 for supplying hot water starts to count the water quantity and detects a fact that a predetermined quantity of water has been supplied, thus opening a tank opening and closing valve 31 and operating a pump 3. Further, simultaneously, a check valve 33 is closed and a bypass valve 32 is opened, whereby at the time of an automatic hot water supply operation, hot water flows along both outgoing and return pipes of a hot water circulation passage. Further, the quantity of automatically supplied hot water is counted by both the water quantity sensor 29 for supplying hot water and an additional burning water quantity sensor 36, and water quantity is adjusted by a supply hot water control valve 24 so that the water quantity counted by both sensor become equal. Further, the temperature of automatically supplied hot water is stably controlled by actuating a proportional control valve 13 based on a signal from a hot water supplying thermistor 18 and controlling the quantity of combustion of a hot water supply burner 14, thus automatically supplying hot water to a bathtub 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater with a reheating function that automatically supplies hot water to a bathtub.

Conventional technology In recent years, water heaters with reheating function have been developed as composite products that connect the water heater and bathtub and combine the reheating device that circulates hot water with a pump. The automation of baths is progressing.

A conventional water heater with reheating function will be explained.

FIG. 2 shows a schematic diagram of the configuration of the conventional example.

1 is a hot water supply heat exchanger connected to a water supply port 1a and a hot water supply port 1b. 2 is a rear-end heat exchanger connected to a hot water return port 2a and a hot water inlet 2b. A pump 3 is provided in the hot water passage leading from the hot water return port 2a to the rear-end heat exchanger 2, and a bathtub 4 is connected to the hot water return port 2a and the hot water inlet 2b by a connecting pipe 5.
are connected to form a hot water circulation passage. An exhaust pipe 6 is connected to each of the heat exchangers 1 and 2, and the combustion exhaust gas is discharged to an exhaust port 8 by an exhaust fan. Further, it is formed in a part of the case 10 so that combustion air can be supplied from the air supply port 9. The combustion passage branches from the original solenoid valve 11 to a hot water supply solenoid valve 12 and a proportional control valve 13.
It is connected to the hot water supply burner 14 through the reheating burner 14 and to the reheating burner 16 through the reheating solenoid valve 15.

Water supply detection element 1 that detects water supply in the water supply side passage and issues a signal
7 is provided, and a hot water supply thermistor 18 is also provided at the outlet of the hot water supply heat exchanger 1.

A circulating water detection element 19 for detecting the circulation of hot water is provided in the hot water passage leading to the pump 3 and the rear-end heat exchanger 2, and
A thermistor 20 for reheating is provided at the inlet of the heat exchanger 2 for reheating. The hot water heater 21 is connected to the hot water supply inlet 1b through a hot water supply pipe 22 to, for example, a bathroom or kitchen, and an automatic hot water supply unit 23 having a hot water control valve 24, a homper 25, and a water level sensor 26 for automatically supplying hot water to the bathtub is connected to the hot water supply pipe 22 to the bathroom or kitchen, for example. It is provided branching off from the piping 22 and connected to the bathtub 4.

Actuators (electromagnetic valves, pumps, etc.) are configured to be operated by a control circuit 27 and a remote controller 28 in response to signals from the various sensors described above.

Next, the operation will be explained. When the hot water heater 21 is opened, the water supply detection element 17 is operated, the main solenoid valve 11, the hot water supply solenoid valve 12, and the proportional control valve 13 are opened, and the hot water supply burner 1 is opened.
The output is calculated and processed by the control circuit 27 so that the hot water supply temperature reaches the hot water temperature set by the hot water temperature setting device (not shown) of the remote control 28. The proportional control valve 13 is operated to control the combustion amount of the hot water supply burner 14 to stably control the temperature of hot water.

On the other hand, by operating a reheating switch (not particularly shown) provided on the remote control 28, the pump 3 is operated and the water or hot water stored in the bathtub 4 is circulated, and the circulating water detection element 19 is operated. The original solenoid valve 111 and the reheating solenoid valve 15 are opened, and the reheating burner 16 is ignited.

The temperature of the circulating return water is sensed, and the signal from the reheating thermistor 20 installed at the entrance of the reheating heat exchanger 2 and the remote control 2 are detected.
The control circuit 27 is operated, the solenoid valve 15 for reheating is operated, and the combustion amount of the burner 16 for reheating is adjusted so that the bath boiling temperature is set by the bathtub water temperature setting device 8 (not shown). The system is configured to stably control the circulating hot water and control the bathtub water temperature.

In addition, when an automatic hot water supply switch (not shown) provided on the remote control 28 is operated, the hot water supply control valve 24 of the automatic hot water supply unit 23 opens, and the hot water temperature set by the hot water temperature setting device (not shown) on the remote control 28 is opened. By operating the proportional control valve 13 with the output calculated by the control circuit 27 and controlling the combustion amount of the hot water supply burner 14 to stably control the hot water temperature, the bathtub 4 Automatic hot water supply to the bathtub and automatic temperature control of the bathtub temperature have been realized.

Problems to be Solved by the Invention However, in the above-described configuration, the automatic hot water supply unit 23 tends to need to be installed in the immediate vicinity of the bathtub 4, and the construction of the building is difficult. If the bathroom is located in the center of a building, it cannot be installed, and even if it could be installed on the wall, it would be problematic in terms of the appearance and aesthetics of the building.

In view of the above-mentioned problems, the present invention aims to provide an automatic hot water supply function that is inexpensive, easy to install, and effective in terms of ease of construction and aesthetics.

Means for Solving the Problems The present invention provides a heat exchanger for hot water supply, a heat exchanger for reheating a hot water circulation passage connected to a bathtub and circulating hot water using a pump, a proportional control valve connected in series to the original solenoid valve, and a proportional control valve connected in series to the original solenoid valve. A solenoid valve for hot water supply and a solenoid valve for reheating are branched and connected in the proportional control valve to each of the hot water supply burner and the reheating burner facing each heat exchanger. A thermistor for hot water supply provided at the outlet, a thermistor for reheating provided at the entrance of the heat exchanger for reheating, a hot water supply amount sensor that branches from the hot water passage downstream of the hot water supply thermistor and counts the amount of hot water supplied to the bathtub, and the amount of hot water supplied to the bathtub. a hot water supply control valve for automatically supplying hot water to the bathtub downstream of the sensor; a tank for storing hot water discharged from the hot water supply control valve;
An automatic hot water supply passage connecting the tank and the hot water circulation passage, a tank opening/closing valve that opens and closes the tank and the hot water circulation passage, a rear-end water flow sensor that counts the amount of water discharged from the pump downstream of the pump, the hot water circulation passage; A backflow prevention valve provided upstream of the connection part of the automatic hot water supply passage, a hot water circulation bypass passage connecting the downstream side of the rear-end water flow sensor located before and after the pump and the upstream side of the backflow prevention valve, and the hot water Consisting of a bypass valve that opens and closes a circulation bypass passage, during automatic hot water supply, the hot water supply control valve is opened, and when the hot water supply water amount sensor detects that a certain amount of water has been supplied into the tank, the tank opening/closing valve is opened. By opening the valve and operating the pump, and at the same time closing the check valve and opening the bypass valve, water flows into both the return and return pipes of the hot water circulation path during automatic hot water supply operation, and the amount of automatic hot water supply is The system is configured such that both the hot water supply water amount sensor and the rear-end water amount sensor count, and the hot water supply control valve is used to adjust the counted amount of each of the water amount sensors to be the same.

According to the above-described configuration, the present invention operates the proportional control valve with the output calculated by the quantity control circuit according to the signal of the hot water supply thermistor to control the combustion amount of the hot water supply burner during hot water supply operation to control the hot water temperature. Stable control is possible, and during reheating operation, the proportional control valve is operated by the output calculated by the control circuit using the signal from the reheating thermistor to control the combustion amount of the reheating burner, thereby stabilizing the bath water temperature. can be controlled.

In addition, during simultaneous operation, the control circuit operates the proportional control valve with the output computed in hot water supply mode with priority to stably control the hot water temperature. By controlling the opening and closing of the valve, the bathtub water temperature can be stably controlled.

Furthermore, during automatic hot water supply operation, by fully opening the hot water supply control valve, water is injected from the hot water heat exchanger into a tank installed in a part of the hot water circulation circuit, and the hot water supply water amount sensor detects that a certain amount of water has been supplied. , open the tank on-off valve and operate the pump. Also, by simultaneously closing the backflow prevention valve and opening the bypass valve, the hot water is configured to flow into both the outgoing and return pipes of the hot water circulation passage during automatic hot water supply operation.
The amount of automatic hot water supply is counted by both the hot water supply water amount sensor and the rear-end water amount sensor, and is adjusted by the hot water supply control valve so that the counted amount of each water amount sensor is the same.

In addition, a proportional control valve is operated based on the signal from the hot water supply thermistor, and the combustion amount of the hot water supply burner is controlled to bring the bath water temperature to the desired bath boiling temperature, allowing automatic hot water supply operation without rear-end operation. It can be completed only by

In addition, the number of parts can be reduced, the cost of the automatic hot water supply function can be reduced, and the purpose can be achieved by making the system free of installation and improving workability and aesthetics.

゛ Embodiment FIG. 1 is a schematic diagram showing an embodiment of the water heater with rear impact function of the present invention.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts and parts.

In the figure, 29 is a water supply sensor, 30 is a tank,
31 is a tank opening/closing valve, 32 is a bypass valve, 33 is a backflow prevention valve, 34 is a hot water circulation bypass passage 35 is an automatic hot water supply passage, and 36 is a reheating water amount sensor.

The configuration of the water heater with rear-end collision function of the present invention will be explained.

Similar to the conventional example, the water heater with rear-end collision function of the present invention has a heat exchanger 1 for hot water supply, which is connected to a water supply port 1a and a hot water supply port 1b, and a water supply detection element 17 that detects water supply in the water supply side passage and outputs a signal. has. 2 is a reheating heat exchanger connected to a hot water return port 2a and a hot water inlet 2b.

A backflow prevention valve 33 that stops circulation in the hot water passage from the hot water return port 2a to the reheating heat exchanger 2, a pump 3, a reheating water amount sensor 3, 6 that detects the amount of circulating hot water, and during automatic hot water supply operation. The backflow prevention valve 33 and reheating water amount sensor 3 that operate only when
A connection port for a hot water circulation bypass passage 34 is provided downstream of the hot water circulation bypass passage 6 and upstream of the non-return valve 33, and a bypass valve 32 for opening and closing the passage is provided in the hot water circulation bypass passage 34.

Furthermore, in order to take hot water from the hot water heat exchanger 1 into the hot water circulation circuit during automatic hot water supply operation, a connection port for the automatic hot water supply passage 35 is automatically installed from the hot water circulation passage between the pump 3 and the backflow prevention valve 33. A tank 30 and a tank opening/closing valve 31 are provided at the upper end of the hot water supply passage 35 to constitute an automatic hot water supply passage 35 and a hot water circulation passage.

An exhaust pipe 6 is connected to each of the heat exchangers 1.2, and the combustion exhaust gas is discharged to an exhaust port 8 by an exhaust fan 7. Further, it is formed in a part of the case 10 so that combustion air can be supplied from the air supply port 9. The fuel passage connects the main solenoid valve 11 and the proportional control valve 13 in series, and branches from this to the hot water supply burner 14 through the hot water supply solenoid valve 12, and the proportional control valve 16 through the reheating solenoid valve 15. Branch connections are made so that the control valves 13 are connected to the same amount. The control circuit 27 controls the hot water supply temperature so that the hot water supply temperature is set by the signal of the hot water supply thermistor 18 provided at the outlet of the hot water supply heat exchanger 1 and the hot water supply temperature setting device (not shown) of the remote control 28.
The proportional control valve 13 is operated using the output calculated in , and the combustion amount of the hot water supply burner 14 is controlled to stably control the temperature of hot water.

On the other hand, the control circuit 27 controls the bath boiling temperature so that the bath boiling temperature is set by the signal from the thermistor 20 for reheating provided at the entrance of the heat exchanger 2 for reheating and the bath water temperature setting device (not shown) of the remote control 28. The proportional control valve 13 is operated with the output calculated in , and the combustion amount of the rear-end burner 16 is controlled, thereby stably controlling the circulating hot water and controlling the bathtub water temperature.

In addition, in order to quickly raise the temperature of the bath water, the proportional control valve 1
The combustion amount of the rear-end burner 16 controlled in 3 is controlled at the maximum capacity without proportional control until it reaches the bath boiling temperature set by the bathtub water temperature setting device.When the boiling temperature reaches 9. A control circuit 27 is configured to close the firing solenoid valve 15.

The hot water supply solenoid valve 12 and the reheating solenoid valve 15 are configured to open and close when controlling the respective hot water temperatures.

In addition, during simultaneous operation, the control circuit 27 operates the proportional control valve 13 with the output calculated in hot water supply mode with priority to stably control the hot water temperature, and the reheating side is controlled by the signal from the rear collision thermistor 2o. By controlling the opening and closing of the reheating solenoid valve 15, the bathtub water temperature is stably controlled.

Furthermore, during automatic hot water supply operation, by opening the hot water supply control valve 24, the hot water supply water amount sensor 29 located upstream of the hot water supply control valve 24 starts counting the amount of water, and detects that a certain amount of water has been supplied. The tank opening/closing valve 31 is opened and the pump 3 is operated.

At the same time, the backflow prevention valve 33 is closed and the bypass valve 32 is opened, so that hot water flows into both the return and return pipes of the hot water circulation passage during automatic hot water supply operation, and the automatic hot water supply amount is determined by the hot water supply water amount sensor. 29 and the reheating water amount sensor 36, and the hot water supply control valve 24 is adjusted so that the counted amount of the water amount sensor 29 and the reheating water amount sensor 36 are the same. Furthermore, the automatic hot water supply temperature is configured such that the proportional control valve 13 is operated in response to a signal from the hot water supply thermistor 18 to control the combustion amount of the hot water supply burner 14 to stably control the hot water temperature and automatically supply hot water to the bathtub 4. It is.

To explain the operation of the above embodiment, when a hot water heater 21 in a bathroom or kitchen, for example, is opened through a hot water supply pipe 22 connected to a hot water supply port 1b, water supply is detected by the water supply detection element 17, and a hot water supply operation sequence is activated. The exhaust fan 7 rotates. The main solenoid valve 11, the hot water supply solenoid valve 12, and the proportional control valve 13 are opened to keep the fuel ignited.

(The ignition holding means is not particularly shown) Then, the hot water supply heat exchanger 1 is heated by combustion of the hot water supply burner 14, and hot water is discharged from the hot water heater 21 through the hot water supply port 1b.

The output temperature of the hot water is detected by the hot water supply thermistor 18, and the proportional control valve uses the output calculated by the control circuit 27 so that the hot water temperature is set by the hot water temperature setting device (not shown) of the remote control 28.] 3 is operated to control the combustion amount of the hot water supply burner 14 to stably control the temperature of hot water.

On the other hand, the pump is activated by operating a reheating operation switch (not particularly shown) provided on the remote control 28.

3 and exhaust fan 7 rotate.

When hot water or water previously stored in the bathtub 4 is circulated by the pump 3, the reheating water amount sensor 36 detects this and the reheating operation sequence is activated, and the main solenoid valve 11. The reheating solenoid valve 13 and the proportional control valve 13 are opened to keep the fuel ignited (the ignition retaining means is not particularly shown).The reheating burner 15 then burns, causing the reheating heat exchanger to open. 2 is heated and circulated in the bathtub 4 from the hot water spout 2b through the connecting pipe 5, and the hot water is circulated to the hot water return port 2a. The control circuit 27 calculates the circulating hot water equal to the water temperature in the bathtub 4 so that it reaches the bath boiling temperature set by the signal from the reheating thermistor 20 and the bathtub water temperature setting device (not shown) of the remote control 28. The proportional control valve 13 is operated using the processed output to control the combustion amount of the reheating burner 16, thereby stably controlling the circulating hot water and controlling the bathtub water temperature.

In addition, in order to make the bath water temperature rise quickly, the proportional control valve 1
The additional combustion amount of the reheating burner 16 controlled in step 3 is controlled at the maximum capacity without proportional control until the bath boiling temperature is set by the bathtub water temperature setting device, and the additional combustion is performed when the boiling temperature is reached. The combustion solenoid valve 15 is closed.

There is also an automatic hot water supply operation switch provided on the remote control 28.

When H is operated, the hot water supply control valve 24 is opened, and the water is passed from the hot water supply heat exchanger 1 to the reheating heat exchanger 2, through the automatic hot water supply passage 35, and from both the hot water outlet 2b and the hot water return port 2a to the bathtub 4. Hot water is supplied automatically.

The hot water supply detection element 17 is configured to detect the water supply and operate an automatic hot water supply operation sequence, and the exhaust fan 7 rotates. After the hot water supply control valve 24 is opened, the hot water supply water amount sensor 29 starts counting, and when the hot water supply water amount sensor detects that a certain amount of water has been supplied to the tank 30, the tank opening/closing valve is opened. At the same time, pump 3 is operated and check valve 3 is operated.
Close 3. In addition, in order to shorten the automatic hot water supply to the bathtub 4 during automatic hot water supply operation, a hot water circulation bypass passage 34 is provided, and by opening the bypass valve 32, the bathtub 4 can be supplied from both the hot water outlet 2b and the hot water return port 2a. - Water is automatically supplied to.

The main solenoid valve 11, the hot water supply solenoid valve 12, and the proportional control valve 13 are opened to keep the fuel ignited. (The ignition holding means is not particularly shown.) The hot water supply heat exchanger 1 is heated by the combustion of the hot water supply burner 14, and hot water is automatically supplied to the bathtub 4 from both the hot water bath 2b and hot water return 2a. . The proportional control valve 13 uses an output calculated by the control circuit 27 to detect the hot water supply temperature with the hot water supply thermistor 18 and set the hot water supply temperature with the bathtub hot water temperature setting device (not shown) of the remote control 28. is operated to control the combustion amount of the hot water supply burner 14 to stably control the temperature of hot water and automatically supply hot water to the bathtub 4.

By doing this, it is possible to complete the automatic hot water supply operation only without reheating the bath to the desired temperature.

The amount of hot water supplied to the bathtub 4 is counted by both the hot water supply water amount sensor 29 and the bath water amount sensor 36.
Start after detection at 9.

Further, the hot water supply control valve 24 is adjusted according to the discharge capacity of the pump 3 to keep the water level in the tank 30 constant so that water is always supplied to the pump 3. Further, the amount of water discharged from the pump 3 is detected by the reheating water amount sensor 36, and the water supplied from the hot water supply control valve 24 to the tank 30 is detected by the hot water supply water amount sensor 29.
The control circuit 27 calculates the count amount and automatically adjusts the hot water supply control valve 24.

Effect of the invention The present invention produces the following effects based on the above configuration.

. 1. Both hot water supply and reheating use a single proportional control valve to proportionally control the amount of combustion and control the hot water temperature, making it possible to stabilize the hot water temperature.

゛2. Since the automatic hot water supply function is built into the main body, the cost can be reduced, installation is free, and construction workability is improved, and the appearance of the building is not impaired.

3. Since the automatic hot water supply to the bathtubs uses a connecting pipe for hot water circulation, there is no need for hot water piping for automatic hot water supply, and construction costs can be reduced.

4. Since hot water can be supplied automatically while the bathtub lid is closed, there is no leakage of hot water, which saves energy and is economical.

5. It is possible to reach the desired bath boiling temperature only by automatic hot water supply operation, without having to drive to reach the desired bath boiling temperature. Unlike conventional methods, there is no need to drive after automatic hot water supply, so the bath boils up to 9.
It takes less time and allows you to enjoy a more economical and comfortable bathing experience.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the water heater with reheating function of the present invention, and FIG. 2 is a schematic diagram showing the construction of a conventional example. 1: Heat exchanger for hot water supply, 2: Heat exchanger for reheating, 3: Pump, 4: Bathtub, 11: Original solenoid valve, 12: Solenoid valve for hot water supply, 1
3: Proportional control valve, 14: Burner for hot water supply, 15: Solenoid valve for reheating, 16: Burner for reheating, 17: Water supply detection element, 18
: Hot water supply thermistor, 19: Circulating water detection element, 20: Reheating thermistor, 24: Hot water supply control valve, 29: Hot water supply water flow sensor, 30: Tank, 31: Tank opening/closing valve, 32: No (inosis valve, 33 : Backflow prevention valve, 34: Hot water circulation) <
Ipass passage, 35: Automatic hot water supply passage, 36: Reheating water amount sensor.

Claims (1)

[Claims] A heat exchanger for hot water supply, a heat exchanger for heating the hot water circulation path that is connected to the bathtub and circulates hot water using a pump, a proportional control valve connected in series to the original solenoid valve, and a burner for hot water supply that looks into each of the heat exchangers. and a reheating burner, a solenoid valve for hot water supply and a solenoid valve for reheating that are branched and connected in the proportional control valve, a thermistor for hot water supply provided at the outlet of the heat exchanger for hot water supply, and a heat for reheating. A reheating thermistor provided at the entrance of the exchanger, a hot water flow sensor that branches from the hot water passage downstream of the hot water supply thermistor and counts the amount of hot water supplied to the bathtub, and a hot water supply flow sensor downstream of the hot water supply flow rate sensor for automatically supplying hot water to the bathtub. a hot water supply control valve, a tank that stores hot water discharged from the hot water supply control valve, an automatic hot water supply passage that connects the tank and the hot water circulation passage, a tank opening/closing valve that opens and closes the tank and the hot water circulation passage, and discharge from the pump downstream of the pump. A reheating water amount sensor that counts the amount of water being heated, a backflow prevention valve installed upstream from the connection between the hot water circulation passage and the automatic hot water supply passage, and a backflow downstream and backflow of the reheating water amount sensor located before and after the pump. It consists of a hot water circulation bypass passage connected to the upstream side of the prevention valve, and a bypass valve that opens and closes the hot water circulation bypass passage, and during automatic hot water supply, the hot water supply control valve is opened and a fixed amount of water is supplied into the tank. The hot water supply water amount sensor detects this, opens the tank on-off valve and operates the pump, and simultaneously closes the backflow prevention valve and opens the bypass valve, thereby preventing hot water circulation during automatic hot water supply operation. It is configured so that hot water flows into both the going and returning pipes of the passage, and the automatic hot water supply amount is counted by both the hot water supply water amount sensor and the reheating water amount sensor, and the hot water supply is controlled so that the counted amount of each water amount sensor is the same. A water heater with additional heating function configured to be adjusted using a valve.