JPH0730952B2 - 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. 4 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 denotes 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 a 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 pipe 6 is connected to each of the heat exchangers 1 and 2, and a 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 so that the combustion air can be supplied from the air supply port 9. The fuel passage is branched from the original solenoid valve 11, connected to the hot water supply burner 14 through the hot water supply solenoid valve 12 and the proportional control valve 13, and connected to the additional heating burner 16 through the additional heating solenoid valve 15. ing.

Water supply detection element 17 that detects water supply 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.

A circulating water detecting element 19 for detecting circulation of hot water is provided in a hot water passage leading to the pump 3 and the heat exchanger 2 for heating, and a thermistor 20 for heating is provided at an inlet of the heat exchanger 2 for heating. An automatic hot water supply unit 23 having a hot water supply flow rate control valve 24, a hopper 25, and a water level sensor 26 for automatically supplying hot water to the bathtub is connected to the hot water supply port 21 through a hot water supply pipe 22 to, for example, a bathroom or a kitchen, and is connected to the hot water supply port 1b. It is provided by branching from the hot water supply pipe 22 and connected to the bathtub 4. The actuator (electromagnetic valve, pump, etc.) is configured to be operated by the control circuit 27 and the remote controller 28 in response to signals from the various sensors.

Next, the operation will be explained. By opening the hot water dispenser 21,
The water supply detection element 17 operates to operate the original solenoid valve 11 and the hot water supply solenoid valve.
12. Proportional control valve 13 opens to ignite the hot water supply burner 14 and the hot water supply thermistor 18 signals to control the hot water temperature.
The proportional control valve 13 is operated by the output processed by the control circuit 27 so that the hot water supply hot water temperature set by the hot water supply hot water temperature setter 28 (not shown) is set, and the combustion amount of the hot water supply burner 14 is set. Is controlled to stably control the hot water temperature.

On the other hand, by operating a reheating switch (not particularly 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 detection element
19 operates, the original solenoid valve 11 and the solenoid valve 15 for additional heating are opened, and the burner 16 for additional heating is ignited.

Sensing the circulating return hot water temperature, the signal from the reheating thermistor 20 installed at the entrance of the reheating heat exchanger 2 and the bath boiling temperature set by the bathtub hot water temperature setting device (not shown) of the remote controller 28. The control circuit 27 is operated so that the temperature rises, the solenoid valve 15 for heating is operated, and the combustion amount of the burner 16 for heating is controlled.
The circulating hot water is stably controlled to control the bath water temperature.

When an automatic hot water supply operation switch (not shown) provided on the remote control 28 is operated, the hot water supply flow rate control valve 24 of the automatic hot water supply unit 23 is opened and set by the hot water supply hot water temperature setting device (not shown) of the remote control 28. By operating the proportional control valve 13 with the output arithmetically processed by the control circuit 27 so as to achieve the specified hot water supply temperature, and controlling the combustion amount of the hot water supply burner 14 to stably control the hot water supply temperature. It realizes automatic hot water supply to bathtub 4 and automatic temperature control of bath temperature.

Problems to be Solved by the Invention However, in the above conventional configuration, the automatic hot water supply unit 23 needs to be installed 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. However, even if it could be installed on the wall, it had a problem in terms of appearance and aesthetics of the building.

In view of the above problems, the present invention intends to provide an automatic hot water supply function which is inexpensive and inexpensive in installation, and which is effective in terms of workability and aesthetics.

Means for Solving the Problems In order to solve the above problems, the water heater with a reheating function of the present invention is a heating water for a hot water circulation circuit that is connected to a hot water heat exchanger and a bath and circulates hot water with a pump. An exchanger, a proportional control valve connected in series with the original solenoid valve, and a hot water supply burner and a burner for heating added to each heat exchanger. Provided at the outlet of the solenoid valve and the reheating solenoid valve and the hot-water supply heat exchanger, provided at the inlet of the hot-water supply thermistor for detecting the hot-water supply temperature and the reheating heat exchanger, for circulating hot water and automatic hot water supply. A hot-water supply thermistor for detecting hot water supply hot water temperature, and a bathtub automatic hot water supply passage having a hot water supply flow rate control valve branched from the hot water supply passage downstream of the hot water supply thermistor and connected to the hot water circulation passage, and the heat exchange for hot water supply Calculate and measure the amount of water supply provided in the water supply passage of the container A water supply detection element and a control circuit, the control circuit opens the hot water supply flow rate control valve during an automatic hot water supply operation, and the control signal is processed by signals of both the hot water supply thermistor and the additional heating thermistor. , Operating the proportional control valve to control the combustion amount of the hot water supply burner, and automatically supplying hot water to the bathtub through the hot water supply heat exchanger and the reheating heat exchanger,
The hot water supply detecting element is configured to close the hot water supply flow rate control valve at an arbitrary set amount to stop automatic hot water supply.

With the above-described configuration, the present invention operates the proportional control valve with the output calculated by the control circuit by 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. Can be controlled,
During the heating operation, the proportional control valve is operated by the output processed by the control circuit in response to the signal from the heating thermistor to control the combustion amount of the heating burner to stably control the bath water temperature.

In addition, during simultaneous operation, the control circuit gives priority to the operation of the hot water supply mode to operate the proportional control valve to control the hot water supply water temperature in a stable manner, and the reheating side uses the signal from the heating thermistor for additional heating. By controlling the opening and closing of the solenoid valve for use, the bath water temperature can be controlled stably.

Further, during the automatic hot water supply operation, the hot water supply flow control valve is opened in the control circuit to automatically supply hot water from the hot water supply heat exchanger to the bathtub through the additional heating heat exchanger, and the automatic hot water supply temperature is added to the hot water supply thermistor. The proportional control valve is operated with the output processed by the control circuit by both signals of the thermistor for heating, and the combustion amount of the hot water supply burner is controlled to automatically heat the hot water (tub water temperature) to the desired temperature. It can be completed only by the automatic hot water supply operation without heating the temperature.

Further, the amount of ignition / extinguishing water can be detected by the water supply detection element provided in the water supply passage for calculating and measuring the amount of water supply, and the hot water supply flow rate control valve can be closed at an arbitrary set amount to stop the automatic hot water supply.

In addition, the number of parts can be reduced, the automatic hot water supply function can be made inexpensive, and the installation can be made free, and the workability and aesthetics can be effectively achieved to achieve the purpose.

Embodiment One embodiment of the present invention will be described below with reference to the schematic configuration diagram of FIG. Reference numeral 1 is a heat exchanger for hot water supply, which is connected to the water supply port 1a and the hot water supply port 1b, and has a water supply detection element (a water amount sensor for counting the amount of water, etc.) 17 which detects water supply in the water supply side passage and outputs a signal. 2 is a heat exchanger for additional heating
2a and hot water outlet 2b. A pump 3 and a circulating water detection element 19 for detecting circulation of hot water are provided in a hot water passage extending from the hot water return port 2a to the heat exchanger 2 for additional heating, and a bathtub 4 is connected to the hot water return port 2a and the hot water outlet port 2b. A pipe 5 is connected to form a hot water circulation passage. An exhaust pipe 6 is connected to each of the heat exchangers 1 and 2, and a combustion exhaust gas is exhausted to an exhaust port 8 by an exhaust fan 7. Further, it is formed in a part of the case so that the combustion air can be supplied from the air supply port 9.

In the fuel passage, the original solenoid valve 11 and the proportional control valve 13 are connected in series,
Branch from this and pass the hot water supply solenoid valve 12 to the hot water supply burner.
A branch connection is made so that the proportional control valve 13 is commonly connected to the additional heating burner 16 through the additional heating solenoid 14 and the additional heating solenoid valve 15.

Next, description will be given according to the schematic diagram of the control circuit configuration in FIG. The comparator 32 of the control circuit 27 performs a comparison operation so that the signal of the thermistor 18 for hot water supply provided at the outlet of the heat exchanger 1 for hot water supply and the hot water supply temperature set by the hot water supply hot water temperature setting device 31 of the remote controller 28 are obtained.
Proportional control valve drive unit with output processed by calculation processing unit 33
34 to operate the proportional control valve 13 and the hot water supply burner 14
The hot water supply operation control unit 38 is configured so as to control the combustion amount of the hot water to stably control the hot water temperature.

On the other hand, the signal of the reheating thermistor 20 for detecting the circulating hot water temperature provided at the inlet of the reheating heat exchanger 2 and the bath boiling temperature set by the bathtub hot water temperature setting device 35 of the remote controller 28 are set to the bath boiling temperature.
The proportional controller 36 of the control circuit 27 performs a comparison operation, and the output processed by the arithmetic processing unit 33 operates the proportional control valve driving unit 34 to operate the proportional control valve 13 to control the combustion amount of the additional burner 16. Then, the reheating operation control unit 37 is configured to stably control the circulating hot water to control the bath water temperature.

Incidentally, in order to accelerate the rise of the bath water temperature, the combustion amount of the additional heating burner 16 controlled by the proportional control valve 13 is set to the bath water temperature setting device.
The bath heating control of the control circuit 27 to close the solenoid valve 15 for heating when the bath boiling temperature set in 35 is controlled with maximum capacity without proportional control and reaches the boiling temperature. It constitutes part 37. Solenoid valve 12 for hot water supply and solenoid valve for reheating
A hot water supply operation control unit 38 and a reheating operation control unit 37 are configured such that the valve 15 is opened and closed when each hot water temperature is controlled.

Further, during the simultaneous operation, the proportional hot water supply operation control unit 38 of the control circuit 27 preferentially performs the arithmetic processing in the hot water supply mode to operate the proportional control valve drive unit 34 to operate the proportional control valve 13 to stabilize the hot water supply hot water temperature. In addition, the reheating side controls the reheating solenoid valve 15 to open and close by the signal of the reheating thermistor 20 to stably control the bath water temperature.
Is configured.

Furthermore, during the automatic hot water supply operation, the hot water circulation passage on the outlet side of the pump 3 is connected to the bathtub automatic hot water supply passage having the hot water supply flow control valve 24 in the center and the check valve 29 downstream and the safety valve (vacuum breaker) 30 upstream. A hot water supply passage downstream of the hot water supply thermistor 18 is branched and connected. Then, the hot water supply flow rate control valve 24 is opened by a signal from the automatic hot water supply operation control unit 39 of the control circuit 27, so that the hot water supply heat exchanger 1 and the additional heating heat exchanger 2
Through, through the control signal obtained by comparing and calculating the signals of both the hot water supply thermistor 18 and the additional heating thermistor 20 by the respective comparators 32 and 36 of the control circuit 27, with the output processed by the arithmetic processing unit 33. Operate the proportional control valve drive unit 34 to operate 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 the automatic hot water supply, and the automatic hot water supply operation control unit 39 is configured to automatically supply hot water to the bathtub 4.

The operation of the above-described embodiment will be described. Through the hot water supply pipe 22 connected to the hot water supply port 1b, for example, a hot water supply system such as a bathroom or a kitchen
When opening 21, the hot water supply operation control unit 38 is configured so that the hot water supply detection element 17 detects the supplied water and the hot water supply operation sequence operates, and the exhaust fan 7 rotates. The original solenoid valve 11, the hot water solenoid valve 12, and the proportional control valve 13 are opened, and the fuel is ignited and held. (Ignition holding means is not particularly shown) 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 supply port 21 through the hot water supply port 1b.

The hot water temperature is detected by the hot water supply thermistor 18 and the remote control
The comparator 32 of the control circuit 27 performs a comparative calculation so that the hot water supply temperature set by the hot water supply temperature setting device 31 of 28 is reached, and the calculation processing unit 33
The proportional control valve drive unit 34 is operated by the output calculated in the above step to operate the proportional control valve 13, and the combustion amount of the hot water supply burner 14 is controlled to stably control the hot water temperature.

On the other hand, the pump 3 and the exhaust fan 7 are rotated by operating an additional heating switch (not shown) provided on the remote controller 28.

When the hot water or water stored in advance in the bathtub 4 is circulated by the pump 3, the reheating operation control unit 37 is configured so that the circulating water detection element 19 detects and the reheating operation sequence operates. Open the solenoid valve 11, the reheating solenoid valve 15, and the proportional control valve 13,
Keep the fuel on ignition. (Ignition holding means is not particularly shown) Then, the heating burner 15 is burned to heat the heating heat exchanger 2 and circulates in the bathtub 4 from the hot water outlet 2b through the connecting pipe 5 to generate hot water. Hot water is circulated through the return port 2a. The comparator 36 of the control circuit 27 compares the circulating hot water equal to the hot water in the bathtub 4 with the signal from the additional thermistor 20 and the bath boiling temperature set by the bathtub hot water temperature setter 35 of the remote controller 28. The proportional control valve drive unit 34 is operated by the output calculated by the arithmetic processing unit 33, and the proportional control valve 13 is operated.
The combustion amount of the additional heating burner 16 is controlled to stably control the circulating hot water to control the bath water temperature.

In order to accelerate the rise of the bath water temperature, the combustion amount of the additional heating burner 16 controlled by the proportional control valve 13 up to the bath boiling temperature set by the bath water temperature setting device 35 is not proportionally controlled. When the boiling temperature is reached by controlling the maximum capacity, the additional heating solenoid valve 15 is closed.

Further, when the automatic hot water supply operation switch provided on the remote controller 28 is operated, the hot water supply flow rate control valve 24 is opened by a signal from the automatic hot water supply operation control unit 39 of the control circuit 27, and the hot water supply heat exchanger 1 and the additional heating heat exchange are performed. Hot water is automatically supplied to the bathtub 4 from the hot water outlet 2b through the device 2. The automatic hot water supply operation control unit detects the water supply by the water supply detection element 17 and operates the automatic hot water supply operation sequence.
39 is configured and the exhaust fan 7 rotates. At that time, the pump 3 is not rotated.

The original solenoid valve 11, the hot water solenoid valve 12, and the proportional control valve 13 are opened, and the fuel is ignited and held. (Ignition holding means is not shown in particular) Then, the hot water supply burner 14 burns to heat the hot water supply heat exchanger 1, and the heated hot water is supplied to the hot water supply flow rate control valve 24, the bathtub automatic hot water supply path, and the hot water circulation path. The hot water is automatically supplied from the hot water outlet 2b to the bathtub 4 through the additional heat exchanger 2.

The automatic hot water temperature is detected by both the hot water supply thermistor 18 and the additional heating thermistor 20, and the bath water temperature setting device 35 of the remote control 28 is detected.
Control circuit so that the bath boiling temperature set by
In accordance with the control signals comparatively calculated by the comparators 32 and 36 of 27, the proportional control valve drive section 34 is operated by the output processed by the arithmetic processing section 33, the proportional control valve 13 is operated, and the hot water supply burner 14 is operated. The hot water temperature is automatically controlled by controlling the combustion amount of the hot water to automatically supply hot water to the bathtub 4.

In this way, the burner for hot water supply is generated by the signal from the thermistor 20 for additional heating.
The control of the combustion amount of 14 is, for example, the hot water supply thermistor.
Even if 18 and the thermistor 20 for additional heating are used with the same specifications, the characteristics of the thermistor 18 for hot water supply differ depending on the part variations, and the set temperature of the thermistor 18 for hot water supply rises or falls. The bath heating temperature may not reach the temperature, so the hot water supply burner 14
This is because the desired bath boiling temperature set by the bathtub hot water temperature setting device 35 can be reliably achieved by controlling the combustion amount of.

By doing so, it is possible to complete the operation only by the automatic hot water supply operation without the operation of heating the bath to the desired bath boiling temperature.

At this time, since the pump 3 is not rotating, the hot water heated by the hot water supply heat exchanger 1 is automatically supplied from the hot water outlet 2b to the bathtub 4 through the additional heat heat exchanger 2, so that the additional heating thermistor 20 It is possible to control the combustion amount of the hot water supply burner 14 by the signal of.

The amount of hot water supplied to the bathtub 4 uses a water amount sensor that counts the amount of water supplied to the water supply detecting element 17, so it detects the amount of water for ignition and extinguishing, and the automatic hot water supply operation of the control circuit 27 during automatic hot water supply operation. The hot water supply flow rate control valve 24 can be automatically closed to automatically stop hot water supply by calculating and measuring by the control unit 39.

The check valve 29 and the safety valve (vacuum breaker) 30 are for preventing backflow into the hot water supply passage due to the rotation of the pump 3 during the additional heating operation.

Next, the automatic hot water supply operation program will be described based on the flowchart of FIG. When the automatic hot water supply operation switch (not shown) is operated, the automatic hot water supply operation program is started. By opening the hot water supply flow rate control valve 24 in step 41, the signal of the water supply detection element 17 is measured in step 42, and when the ignition water amount is detected, the automatic hot water supply operation sequence in step 43 operates and the hot water supply burner 14 operates. The hot water supply heat exchanger 1 is burnt and heated, and is automatically supplied to the bathtub 4 from the hot water outlet 2b through the hot water supply flow control valve 24, the bathtub automatic hot water supply passage, and the reheating heat exchanger 2.

The automatic hot water temperature is detected by both the hot water supply thermistor 18 and the additional heating thermistor 20, and the bath water temperature setting device 35 of the remote control 28 is detected.
Control circuit so that the bath boiling temperature set by
The comparator 32 and the comparator 36 of 27 each perform a comparison operation, and step
With 44 and 45, the hot water temperature is automatically controlled by automatically controlling the hot water temperature to the set temperature above the bath.

When the automatic hot water supply amount in step 46 reaches the set amount, step
At 47, the hot water supply flow rate control valve 24 is closed to stop the automatic hot water supply, and the hot water can be automatically supplied to the bathtub 4 in a short time up to the desired bath boiling temperature.

Effect of the Invention As described above, the present invention is an additional heat exchanger for a hot water circulation circuit that is connected to a hot water supply heat exchanger and a bath to circulate hot water with a pump, and a proportional control valve connected in series to the original solenoid valve. For each of the hot water supply burner and the additional heating burner, which are desired for each heat exchanger,
Provided at the outlet of the hot water supply heat exchanger and hot water supply solenoid valve branched and connected from the proportional control valve, and at the inlet of the hot water supply thermistor and hot water heat exchanger that detect the hot water temperature. A bathtub automatic hot water supply that has a hot water supply thermistor for detecting the circulating hot water temperature and the hot water hot water temperature during automatic hot water supply, and a hot water supply flow control valve that branches from the hot water supply passage downstream of the hot water supply thermistor and is connected to the hot water circulation passage A hot water supply passage of the hot water supply heat exchanger, and a water supply detection element for calculating and measuring the amount of water supplied, and a control circuit.The control circuit opens the hot water supply flow rate control valve during the automatic hot water supply operation, and the hot water supply thermistor. By the control signal processed by the signals of both and the thermistor for additional heating,
A configuration in which the proportional control valve is operated to control the combustion amount of the hot water supply burner to automatically supply hot water to the bathtub, and the hot water supply detection element closes the hot water supply flow control valve at an arbitrary set amount to stop automatic hot water supply. Therefore, it has the following effects.

(1) Since the hot water temperature is controlled by proportionally controlling the combustion amount with one proportional control valve for both hot water supply and additional heating, the hot water temperature can be stabilized.

(2) In particular, since the bath temperature can be controlled in proportion to the bath temperature, energy saving can be achieved as compared with the conventional hot-water control by Hi-Lo-OFF or ON-OFF control.

(3) Since the automatic hot water supply function is built into the main body, 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) By using the water supply detection element as a water amount sensor that counts the amount of water supplied, it is possible to set the amount of hot water supplied to the bathtub automatically during automatic hot water supply and automatically stop it. No water level sensor that detects the water level in the bathtub is required other than the sensor that detects the water level.

(5) Since automatic hot water supply to the bathtub uses a connection pipe for circulating hot water, there is no need for a hot water supply pipe for automatic hot water supply, and construction costs can be reduced.

(6) Since hot water can be automatically supplied with the lid of the bathtub kept open, there is no need to sprinkle water, energy can be saved, and it is economical.

(7) Bath heating time can be completed only by automatic hot water supply operation without additional heating operation to the desired bath boiling temperature, and does not require additional heating operation after automatic hot water supply as in the past. It becomes shorter and you can have a comfortable bath life economically.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a water heater with a reheating function according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a control circuit of the water heater.
FIG. 3 is a flow chart of an automatic hot water supply operation program for the water heater, and FIG. 4 is a schematic configuration diagram of a conventional example. 1 ... Hot water heat exchanger, 2 Reheating heat exchanger, 3 ... Pump, 4 ... Bathtub, 11 ... Original solenoid valve, 12 ... Hot water solenoid valve, 13 ... Proportional control valve, 14 …… Hot water supply burner, 15 …… Additional heating solenoid valve, 16 …… Additional heat burner, 17 …… Water supply detection element, 18 …… Hot water supply thermistor, 19 …… Circulating water detection element,
20 …… additional heating thermistor, 24 …… hot water supply flow control valve, 27…
… Control circuit, 28… Remote control (control section).

Claims (1)

[Claims] 1. A heat exchanger for reheating a hot water circulation passage, which is connected to a heat exchanger for hot water supply and a bath and circulates hot water by a pump, a proportional control valve connected in series with an original solenoid valve, and each of the heat exchangers. A hot water supply solenoid valve and a reheating solenoid valve branched and connected from the proportional control valve to each of the desired hot water supply burner and additional heat burner, and hot water supply provided at the outlet of the hot water heat exchanger. A hot water thermistor for detecting the temperature and a hot water thermistor for detecting the circulating hot water temperature and the hot water temperature at the time of automatic hot water provided at the entrance of the heat exchanger for the additional heating, and a branch from the hot water supply passage downstream of the hot water thermistor. And, a bathtub automatic hot water supply passage having a hot water supply flow rate control valve connected to the hot water circulation passage, a water supply detection element for calculating and measuring the amount of water supply provided in the water supply passage of the heat exchanger for hot water supply, and a control circuit, During the automatic hot water supply operation, the control circuit The hot water flow rate control valve is opened, and the control signal calculated by the signals of both the hot water supply thermistor and the additional heating thermistor is operated to control the combustion amount of the hot water supply burner by operating the proportional control valve. A water heater with a reheating function configured to automatically supply hot water to a bathtub and to automatically stop hot water supply by closing the hot water supply flow rate control valve at an arbitrary set amount by the water supply detection element.