JPH0723804B2 - Hot water heater with additional heating function - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater with a reheating function that has a function of automatically supplying hot water to a bathtub and a high-temperature hot water supply function.

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. Baths such as added ones are being automatically supplied.

A conventional water heater with a reheating function will be described below with reference to the drawings. FIG. 8 shows a schematic configuration diagram 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 the hot water passage from the hot water return port 2a to the heat exchanger 2 for additional heating, and a bathtub 4 is connected between 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. Constitute.

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 10 so that combustion air can be supplied from the air supply port 9. The fuel passage branches from the original solenoid valve 11, passes through the hot water supply solenoid valve 12 and the proportional control valve 13 to the hot water supply burner 14, and the additional heating solenoid valve.
Each of them is connected to a burning burner 16 through 15.

Water supply detection element 17 that detects water supply in the water supply side passage and outputs a signal
In addition to the above, a hot water supply thermistor 18 for detecting the hot water supply temperature 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 an additional hot water detecting element for detecting hot water temperature at the inlet of the heat exchanger 2 for heating. A thermistor 20 for heating is provided.

The hot water supply 21 is connected to the hot water supply port 1b through, for example, a hot water supply pipe 22 to a bathroom or a kitchen, and a hot water supply control valve 24, a hopper 25, and a water level sensor for hot water are automatically supplied to the bathtub.
An automatic hot water supply unit 23 having 26 is provided 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,
Water flows into the water supply passage, the water supply detection element 17 operates, the main solenoid valve 11, the hot water supply solenoid valve 12 and the proportional control valve 13 open, and the fuel flowing to the hot water supply burner 14 is ignited to ignite the hot water supply thermistor 18. Signal to cause the proportional control valve 13 to operate with the output processed by the control circuit 27 so that the hot water supply temperature becomes the hot water supply temperature set by the hot water supply hot water temperature setting device (not shown) of the remote controller 28. The combustion amount of the hot water supply burner 14 is controlled to stably control the hot water supply hot water temperature.

On the other hand, by operating an additional heating 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 which detects this is detected. Operates, the original solenoid valve 11, solenoid valve for additional heating
The valve 15 opens to ignite the fuel that has flowed to the additional burner 16. Then, the circulating hot water temperature is sensed and set by the signal from the additional heating thermistor 20 provided at the inlet of the additional heat exchanger 2 and the bath water temperature setting device (not shown) of the remote controller 28. The control circuit 27 is operated so that the bath heating temperature is reached, and the additional heating solenoid valve 15 is operated to control the combustion amount of the additional heating burner 16 to stably control the circulating hot water to control the bath water temperature. Is configured to control.

When an automatic hot water supply operation switch (not shown) provided on the remote controller 28 is operated, the hot water supply 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 controller 28. Control circuit so that the automatic hot water temperature
The proportional control valve 13 is operated with the output calculated in 27, and the combustion amount of the hot water supply burner 14 is controlled to stably control the hot water temperature, thereby automatically supplying hot water to the bathtub 4. In order to cover the decrease in the hot water temperature due to the length of the hot water supply pipe 22, the water level sensor 26 operates to close the hot water supply control valve 24 to stop the automatic hot water supply, and then the pump 3 is operated. , The control circuit 27 is operated so as to reach the bath boiling temperature set by the signal of the thermistor 20 for heating and the bath water temperature setting device (not shown) of the remote controller 28, and the electromagnetic for heating is heated. The valve 15 is operated to control the combustion amount of the additional heating burner 16 to stably control the circulating hot water to control the bath water temperature.

Problems to be Solved by the Invention However, in the above-described configuration, the automatic hot water supply unit 23 needs to be installed in the immediate vicinity of the bathtub 4, and is installed when the bathroom is in the center of the room due to the configuration of the building. However, even if it can be installed on the wall side, there is a problem in that it has a problem in appearance and aesthetics of the building, and because the water level sensor is fixed, it is not possible to freely select the desired water level. It was

Further, after the automatic hot water supply operation, the additional heating operation is required, and it takes time to reach the bath boiling temperature, which is uneconomical.

Further, when hot water is cooled during bathing, it is necessary to raise the bath water temperature by operating the reheating switch, but it takes a long time to raise the temperature because the capacity of the reheating burner is low. was there.

Therefore, many people often drop hot water from the hot water supply (faucet) into the bathtub, but due to the high temperature, there were problems such as burns from the hot water supply (faucet) and hot water.

In view of the above problems, the present invention intends to provide an automatic hot water supply function which is inexpensive and can be installed freely, 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 passage which 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 solenoid connected branching from the proportional control valve to each of the hot water supply burner and the additional heating burner desired for each heat exchanger. Valve and solenoid valve for reheating, installed at the outlet of the hot water supply heat exchanger, provided at the inlet of the hot water supply thermistor and hot water supply heat exchanger for detecting hot water supply temperature, and for hot water supply for detecting circulating hot water temperature A thermistor, a hot water supply passage downstream of the hot water supply thermistor, and a hot water supply flow rate control valve provided in a bathtub automatic hot water supply passage connected to the bathtub, and a water supply passage of the heat exchanger for hot water supply. It has a water supply detection element and a control circuit During hot water operation, the control circuit opens the hot water supply flow rate control valve, operates the proportional control valve according to a control signal that is arithmetically processed by the signal of the hot water supply thermistor, and controls the combustion amount of the hot water supply burner. The bathtub automatic hot water is supplied to the bathtub by the control signal (feedback) of the water supply detection element so that the automatic hot water supply temperature (desired bath boiling temperature) reaches a large flow rate, and the hot water supply flow rate control valve is activated by the signal of the water supply detection element. The valve is closed at an arbitrary set amount to stop the automatic hot water supply in the bathtub, and only the automatic hot water supply operation is completed without the additional heating operation.At the same time, when the water temperature is low during the automatic hot water supply in the bathtub, such as during winter, or when there is a multi-stop hot water supply plug. When the hot water supply capacity is exceeded by use, and when the specified amount is integrated and measured by the signal of the water supply detection element, the additional heating solenoid valve is opened by the signal of the control circuit to perform the additional operation. The burner for combustion is also burned at the same time, and the pump is also rotated to circulate hot water to automatically supply hot water to the bathtub.During high-temperature hot water operation, the hot water supply flow rate control valve is controlled to a small flow rate by the control signal of the hot water supply detection element to increase the high temperature. The control circuit is configured so that hot water supply is performed through the bathtub automatic hot water supply passage.

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. It can be controlled. Further, during the heating operation, the proportional control valve is operated by the output processed by the control circuit according to the signal from the heating thermistor to control the combustion amount of the heating burner to stably control the bath water temperature. .

Also, in the simultaneous operation of both of the above, the control circuit preferentially operates the proportional control valve with the output calculated in the hot water supply mode to stably control the hot water temperature, and the reheating side outputs the signal of the thermistor for heating. By controlling the opening and closing of the additional heating solenoid valve, the bath water temperature can be controlled stably.

Further, during the automatic hot water supply operation, the hot water supply flow rate control valve is opened at a large flow rate to automatically supply a large amount of hot water from the heat exchanger for hot water supply to the bathtub through the bathtub automatic hot water supply passage, and the automatic hot water supply temperature is sent to the hot water supply thermistor's signal. The proportional control valve is operated by the output calculated by the control circuit to control the combustion amount of the hot water supply burner. Further, when the water temperature is low during the automatic hot water supply in the bathtub, such as during winter, or when the hot water supply capacity is exceeded due to the use of multiple taps, the solenoid valve for additional heating is opened by the signal from the control circuit. By automatically burning the heating burner at the same time and rotating the pump to circulate the hot water (additional heating operation) to automatically supply hot water to the bathtub, the hot water in the bathtub can be automatically heated to the desired bath heating temperature in a short time. Further, the hot water supply flow rate control valve can be closed at an arbitrary set amount by the signal of the water supply detecting element, and the automatic hot water supply can be stopped, so that the automatic hot water supply operation can be completed without the additional heating operation.

On the other hand, when hot water is cooled during bathing, the hot water supply flow rate control valve is controlled to a small flow rate and high-temperature hot water is supplied through the bathtub automatic hot water supply passage. The temperature can be raised in a short time and there is no risk of burns.

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

Example An example 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. 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 and a circulating water detecting element 19 for detecting circulation of hot water are provided in a hot water passage extending from the hot water returning port 2a to the heat exchanger 2 for additional heating, and a bathtub 4 is provided between the hot water returning port 2a and the hot water outgoing port 2b. Are connected by a connecting pipe 5 to form a hot water circulation passage. An exhaust stack 6 is provided in each of the heat exchangers 1 and 2.
Are connected, and the exhaust fan 7 discharges the combustion exhaust gas to the exhaust port 8. Further, it is formed in a part of the case 10 so that combustion air can be supplied from the air supply port 9. In the fuel passage, an original solenoid valve 11 and a proportional control valve 13 are connected in series, and a branch is made from this to supply a hot water supply burner 14 through a hot water supply solenoid valve 14 and a supplementary heating burner 16 through a reheating solenoid valve 15.
In addition, the proportional control valve 13 is branched and connected so as to be commonly connected.

Next, the control circuit configuration schematic diagram of FIG. 2 will be described together.

During the hot water supply operation, the hot water supply thermistor 18 which detects the hot water supply water temperature provided at the outlet of the hot water supply heat exchanger 1 and the hot water supply temperature setting device 31 of the remote controller 28 are controlled to reach the hot water supply temperature. The comparator 32 of the circuit 27 performs a comparison operation and the operation processing unit
The proportional control valve drive unit 34 is operated with the output processed by 33 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 supply temperature (hot water supply operation sequence The hot water supply operation control unit 38 is configured as described above.

On the other hand, during the reheating operation, the signal from the reheating thermistor 20 for detecting the circulating hot water temperature provided at the inlet of the reheating heat exchanger 2 and the bath heating set by the bath water temperature setting device 35 of the remote controller 28. The comparator 32 of the control circuit 27 performs a comparative calculation so that the temperature becomes the temperature, and the proportional control valve drive unit 34 is operated by the output processed by the arithmetic processing unit 33, and the proportional control valve 13 is operated. The reheating operation control unit 37 is configured to control the combustion amount of the heating burner 16 to stably control the circulating hot water to control the bathtub hot water temperature (reheating operation sequence).

In addition, in order to speed up the rise of bath water temperature, the proportional control valve 13
The combustion amount of the additional heating burner 16 controlled by up to the bath boiling temperature set by the bath water temperature setting device 35, when the boiling temperature is reached by controlling the maximum capacity without proportional control, The reheating operation control section 37 of the control circuit 27 is configured to open the reheating solenoid valve 15.

The hot water supply solenoid valve 12 and the hot water supply solenoid valve 15 are configured with a hot water supply operation control unit 37 and a hot water supply operation control unit 38 so as to open and close when controlling the respective hot water temperatures.

Further, during the above-mentioned simultaneous operation, the proportional control valve drive unit 34 is operated by the output which is arithmetically processed by the arithmetic processing unit 33 in the hot water supply operation control unit 38 of the control circuit 27 in the hot water supply mode preferentially. While controlling the hot water supply hot water temperature stably, the hot water heating side stably controls the hot water temperature of the bathtub by controlling the opening and closing of the hot water heating solenoid valve 15 by the signal of the hot water heating thermistor 20 (simultaneously. The additional heating control unit 37 is configured as described above.

Further, at the time of automatic hot water supply operation, a hot water supply flow rate control valve 24 having a small flow rate and a large flow rate driven by a motor or the like and a valve closing function (a schematic diagram is shown in FIG. 4) and a safety valve 29 (vacuum breaker) are provided. A hot water supply passage downstream of the hot water supply thermistor 18 is branched and connected, and is connected to the bathtub 4 through a bathtub automatic hot water supply passage 30. Then, by opening the hot water supply flow rate control valve 24 at a large flow rate in response to a signal from the hot water supply operation control unit 38, the hot water supply heat exchanger 1 is passed through,
The signal from the hot water supply thermistor 18 and the automatic hot water supply temperature set by the automatic hot water supply temperature setting device 39 of the remote controller 28 are compared and calculated by the comparator 32 of the control circuit 27, and the calculation processing unit 33. The proportional control valve drive unit 34 is operated by the output processed by the above, the proportional control valve 13 is operated, the combustion amount of the hot water supply burner 14 is controlled, and the hot water supply hot water temperature is stably controlled. The hot water supply operation control unit 38 is configured to automatically supply hot water at a large flow rate (automatic hot water supply operation sequence).

In addition, when the water temperature is low, such as in winter, when the hot water supply capacity is exceeded, the signal from the hot water supply thermistor 18 becomes lower than the automatic hot water supply set temperature, and the deviation from the desired bath boiling temperature is larger than the comparator. In the case of comparison calculation in 32, the signal of the water supply detection element 17 for calculating and measuring the amount of water supply provided in the water supply passage is specified by the hot water supply operation control unit 38 (for example, 1/3 to 1/2 of the bathtub 4). The amount of water is about 80-100
) Is cumulatively measured, the pump 13 is also rotated to circulate warm water, and the reheating water control element 37 is operated by the operation of the circulating water detection element 19 to open the reheating solenoid valve 15. The hot-burner 16 is also burned at the same time to automatically supply hot water to the bath 4 while controlling the hot water temperature of the bath, and the hot water supply flow control valve 24 is set to an arbitrary set amount by the integrated measurement of the water supply detecting element 17. The hot water supply operation control unit 38 is configured to automatically stop hot water supply and stop the hot water supply to the desired bath boiling temperature in a short time by closing the valve.

Also, during high temperature hot water operation, the hot water supply flow rate control valve 24 (having a function of controlling a small flow rate and a large flow rate driven by a motor or the like and a valve closing function: a schematic diagram is shown in Fig. 4) is automatically set to a small flow rate. The temperature of the hot water is set by the high-temperature hot water / hot water temperature setting device 40 (inside the remote control) of the remote controller 28 (for example, about 80 ° C.), and the temperature is automatically set to Through the hot water supply heat exchanger 1, the comparator 32 of the control circuit 27 performs a comparison operation so that the signal of the hot water supply thermistor 18 and the hot water temperature set by the high temperature hot water hot water temperature setting device 40 become the hot water temperature. Then, the proportional control valve drive unit 34 is operated by the output processed by the arithmetic processing unit 33 to operate the proportional control valve 13 to control the combustion amount of the hot water supply burner 14 to stabilize the hot water temperature. It is controlled and hot water is poured into the bathtub 4 with a small flow rate (high temperature hot water). Operation Sequence) As described above, you have configured the bathtub operation control unit 38.

Next, the hot water supply capability characteristic diagram of FIG. 3 and the drive hot water flow rate control valve schematic diagram of FIG. 4 will be described.

FIG. 3 is a characteristic diagram of hot water supply capability of the heat exchanger 1 for hot water supply. In the case of the automatic hot water supply operation (A), the automatic hot water supply hot water temperature setting device.
When the hot water supply temperature set at 39 (for example, about 42 ° C),
Comparator of the control circuit 27 so that the automatic hot water supply flow rate set by the automatic hot water supply flow rate setting device 41 in the figure (for example, about 10 / min)
The motor of the hot water supply flow rate control valve 24 is operated by operating the hot water supply flow rate control valve drive unit 45 with the output that is compared and calculated by 43 and is processed by the calculation processing unit 44 (may be the same as the calculation processing unit 33).
Drive 24a. The gear 24d connected to the flow control valve shaft 24e is rotated in conjunction with the gear 24c provided on the motor shaft 24b. The flow rate control valve shaft 24e has a threaded portion 24f, a control valve portion 24g is provided at the tip end thereof, and a spring 24h is provided, and the flow control valve shaft 24e is incorporated in the control valve body 24i. The control valve part 24g has a small amount of hot water supply, a large flow amount, and a valve closing function due to the gap with the valve seat 24j, so a large flow amount flows, and the automatic hot water supply flow amount is calculated and measured by the water supply detection element 17. , The hot water supply flow control valve
24 is configured to control the flow rate so that it becomes the set flow rate.

Further, the water supply detecting element 1 is set to the automatic hot water supply set flow rate set by the automatic hot water supply integrated flow rate setting device 42 of the remote controller 28 (the automatic hot water supply integrated flow rate corresponding to the desired water level to the bathtub: for example, about 180).
When the total is measured in 7, the hot water supply flow control valve 24
Is closed to stop the automatic hot water supply.

On the other hand, in the case of high-temperature hot water operation (B), when the hot water supply temperature is set by the high-temperature hot water / hot water temperature setting device 40 (for example, about 80 ° C.), the high-temperature hot water / hot water flow amount setting device 46 of FIG. 4 is used. The comparator 43 of the control circuit 27 performs a comparative calculation so that the set high-temperature hot water flow rate (for example, about 5 / min), and the calculation processing unit 44 (may be the same as the calculation processing unit 33) performs calculation processing. The hot water supply flow rate control valve drive unit 45 is operated with the output, the motor 24a of the hot water supply flow rate control valve 24 is driven, a small flow rate is caused to flow, and the hot water flow rate is calculated and measured by the water supply detection element 17, and the hot water supply is performed. The flow control valve 24 is configured to control the flow rate.

The operation of the above embodiment will be described with reference to the front view of the remote controller of FIG. 5 and the flowchart of FIG.

I. Hot water supply operation After operating the hot water supply operation switch 28a of the remote controller 28, when the hot water supply pipe 21 connected through the hot water supply pipe 22 connected to the hot water supply port 1b, such as a bathroom or kitchen, is opened, the operation shown in FIG. 6 is performed. The program starts. Step 50 automatic hot water supply? , Hot water in step 51? , Hot water supply in step 52? Is determined, and the hot water supply operation mode is set.

The water flowing through the water supply passage is measured in step 53 by the signal of the water supply detecting element 17, and when the amount of ignition water is detected, the hot water supply operation control unit 38 is configured to operate the hot water supply operation sequence in step 54. 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 pipe 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
In step 55 and step 56, the comparator 32 of the control circuit 27 performs comparative calculation so that the hot water supply temperature set by the hot water supply hot water temperature setting device 31 of 28 is proportional, and the output processed by the calculation processing unit 33 is proportional. The control valve drive unit 34 is operated to operate the proportional control valve 13 to control the combustion amount of the hot water supply burner 14 to stably control the hot water temperature.

II. Heating operation On the other hand, by operating the heating operation switch 28b provided on the remote controller 28, the pump 3 and the exhaust fan 7 rotate.

When the hot water or water stored in advance in the bathtub 4 is circulated by the pump 3, the circulating water detection element 19 detects this, and the additional heating operation control unit 37 is operated so that the additional heating operation sequence of step 57 operates.
The main solenoid valve 11, the additional solenoid valve 15, and the proportional control valve 13 are opened to ignite and hold the fuel. (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. In order to bring the circulating hot water equal to the hot water in the bathtub 4 to the bath boiling temperature set by the signal of the thermistor 20 for additional heating and the bathtub hot water temperature setter 35 of the remote control 28, the control circuit is carried out by the steps 58 and 59. Comparing calculation by 27 comparator 36, calculation processing unit
The proportional control valve drive unit 34 is operated by the output processed by 33, the proportional control valve 13 is operated, and the additional burner 16 is operated.
It controls the amount of combustion of the hot water, stably controls the circulating hot water, and controls the bath water temperature.

In addition, in order to speed up the rise of bath water temperature, the proportional control valve 13
When the combustion amount of the additional heating burner 16 controlled by the temperature reaches the bath boiling temperature set by the bathtub hot water temperature setting device 35, when the boiling temperature controlled by the maximum capacity without proportional control is reached, the additional heating is performed. The reheating operation control section 37 controls so as to close the solenoid valve 15 for use.

III. Hot water supply / additional heating simultaneous operation In addition, in either of the above-mentioned I. hot water supply operation or II. Additional heating operation, when operating simultaneously, the other is also operated Although not shown, if the signal of the water supply detecting element 17 is measured in step 53 during the reheating operation sequence of step 57, and the hot water supply operation is detected, the hot water supply operation control unit 38 of the control circuit 27 gives priority. In the hot water supply mode, the proportional control valve drive unit 34 is operated with the output processed by the arithmetic processing unit 33, and the proportional control valve is operated.
13 is operated to control the hot water supply temperature in a stable manner, and on the reheating side, the reheating operation control unit 38 is operated by the signal from the reheating thermistor 20.
Is operated to control the opening / closing of the solenoid valve 15 for additional heating, thereby stably controlling the bath water temperature.

IV. Automatic hot water supply operation When the automatic hot water supply operation switch 28c provided on the remote controller 28 is operated, the hot water supply flow rate control valve 24 is opened in step 60,
Hot water is automatically supplied to the bathtub 4 through the hot water supply heat exchanger 1 and the bathtub automatic hot water supply passage 30.

In step 61, the signal of the water supply detecting element 17 is measured, and when the water supply is detected, the hot water supply operation control section 38 is configured so that the automatic hot water supply operation sequence in step 62 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 automatically supplied to the bathtub 4 through the hot water supply flow rate control valve 24 and the bathtub automatic hot water supply passage 30. . Step 63 and step 63 so that the automatic hot water supply flow rate set by the automatic hot water supply flow rate setting device 41 of FIG. 4 (for example, about 10 / min)
64, the comparator 43 of the control circuit 27 and the water supply detection element 17
The signal is compared and calculated, and the hot water supply flow rate control valve drive unit 45 is operated by the output processed by the calculation processing unit 44 to control the hot water supply flow rate control valve 24 at a large flow rate for automatic hot water supply.

The hot water supply temperature is detected by the hot water supply thermistor 18, and the remote control
The hot water supply temperature (desired bath boiling temperature) set by the automatic hot water supply hot water temperature setting device 39 of 28 is compared with the comparator 32 of the control circuit 27, and it is determined at step 65 whether or not the hot water supply capability is exceeded.

Normally, it is controlled within the hot water supply capacity range, so in steps 66 and 67, the comparator 32 of the control circuit 27 performs a comparison operation, and the proportional control valve drive unit 34 is operated by the output processed by the operation processing unit 33. Burner for hot water supply by operating the proportional control valve 13
The amount of combustion of 14 is controlled to stably control the hot water supply temperature to the automatic hot water supply set temperature, and the hot water is automatically supplied to the bathtub 4 at a large flow rate.

Further, the water supply detecting element 1 is set to the automatic hot water supply set flow rate set by the automatic hot water supply integrated flow rate setting device 42 of the remote controller 28 (the automatic hot water supply integrated flow rate corresponding to the desired water level to the bathtub: for example, about 180).
When the total amount is measured in 7 and reaches the set amount in step 68, the hot water supply flow rate control valve 24 is automatically closed to stop the automatic hot water supply in step 69, and the bath temperature is set to the desired bath boiling temperature, and
It can be completed only by the automatic hot water supply operation without the additional heating operation to the desired desired water level.

The safety valve (vacuum breaker) 29 is used during automatic hot water supply operation,
This is for preventing backflow into the hot water supply passage due to the rotation of the pump 3 during the additional heating operation.

V. Simultaneous operation of automatic hot water supply and automatic reheating In addition, when the water temperature is low during the hot water supply in the bathtub, such as during the winter season, or when the hot water supply plug is used, the hot water supply capability is exceeded and the signal from the hot water supply thermistor 18 is automatically set. It becomes lower than the temperature, and it becomes the temperature of point C of the hot water supply capacity curve in winter shown by the broken line in the hot water supply capacity characteristic diagram of Fig. 3, and the comparator 32 calculates that the deviation is larger than the desired bath boiling temperature. If it is determined in step 65 that the hot water supply capacity is equal to or higher than the hot water supply capacity, the automatic hot water supply amount is determined in step 70 shown in the flowchart of FIG.
When the specified amount (for example, 80 to 100) set by the automatic hot water supply specified amount setter 47 of the remote controller 28 shown in FIG. 4 is measured, the process proceeds to the automatic hot water supply / automatic heating simultaneous operation sequence in step 71. , The pump 13 is also rotated to circulate hot water,
By the operation of the circulating water detection element 19, the additional heating operation control unit
37 is operated to open the additional heating solenoid valve 15 to burn the additional heating burner 16 at the same time, and in step 72 and step 73, the bath water temperature is controlled to a desired bath boiling set temperature. Therefore, the bathtub temperature is controlled stably while automatically supplying hot water.

Further, the water supply detecting element 1 is set to the automatic hot water supply set flow rate set by the automatic hot water supply integrated flow rate setting device 42 of the remote controller 28 (the automatic hot water supply integrated flow rate corresponding to the desired water level to the bathtub: for example, about 180).
When the total amount is measured in step 7 and the set amount in step 74 is reached, in step 75 the hot water supply flow control valve 24 is automatically closed and the bath 4
It is possible to stop the automatic hot water supply to the bathtub and complete the bathtub temperature at the desired bath boiling temperature and at the desired desired water level.

VI. High-temperature hot water operation When the high-temperature hot water operation mode is determined in step 51 by operating the high-temperature hot water operation switch 28d of the remote controller 28 when the water is cooled during bathing, in step 76, the hot water supply flow rate is determined. The control valve 24 is opened, and the hot water heat exchanger 1
And hot water is poured into the bathtub 4 through the bathtub automatic hot water supply passage 30.

In step 77, the signal of the water supply detecting element 17 is measured, and when the water supply is detected, the hot water supply operation control unit 38 is configured so that the high temperature hot water operation sequence of step 78 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 hot water is poured into the bathtub 4 through the hot water supply flow rate control valve 24 and the bathtub automatic hot water supply passage 30. It Fourth
By the steps 79 and 80, the comparator 43 of the control circuit 27 and the water supply detecting element 17 are controlled so that the high-temperature hot water flow rate set by the high-temperature hot water flow rate setting device 46 (for example, about 5 / min) is obtained. The signal is compared and calculated, and the hot water supply flow rate control valve drive unit 45 is operated by the output processed by the calculation processing unit 44 to control the flow rate of the hot water supply flow rate control valve 24 with a small flow rate, and the high temperature hot water of the remote controller 28 is controlled. In step 81 and step 82, the comparator 32 of the control circuit 27 performs a comparison calculation so that the temperature of the hot water set by the temperature setting device 40 (for example, about 80 ° C.), and the calculation processing unit 33.
The proportional control valve drive unit 34 is operated by the output calculated by the above, the proportional control valve 13 is operated, the combustion amount of the hot water supply burner 14 is controlled, and the hot water temperature is stably controlled and the flow rate to the bathtub 4 is reduced. Hot water can be supplied.

By controlling the hot water supply flow rate control valve to a small flow rate and supplying hot hot water through the hot tub automatic hot water supply passage, it is possible to control with a high capacity hot water supply burner, so that it is possible to raise the temperature in a short time and to prevent burns. There is no fear.

Effect of the Invention As described above, the present invention is a heat exchanger for heating a hot water circulation passage that is connected to a hot water heat exchanger and a bathtub and circulates hot water with a pump, and a proportional control valve connected in series to the original solenoid valve, A hot water supply solenoid valve and a reheating solenoid valve branched and connected from the proportional control valve to each of the hot water supply burner and the additional heating burner desired for each heat exchanger, and the hot water supply heat exchanger. Provided at the outlet, provided at the inlet of the hot water supply thermistor for detecting the hot water hot water temperature and the heat exchanger for additional heating, branching from the hot water supply thermistor for detecting the circulating hot water temperature and the hot water supply passage downstream of the hot water supply thermistor, The hot water supply flow rate control valve provided in the bathtub automatic hot water supply passage connected to the bathtub and the water supply passage of the hot water supply heat exchanger are provided with a water supply detection element for calculating and measuring the amount of water supply, and a control circuit. The circuit opens the hot water supply flow control valve, The proportional control valve is operated by a control signal calculated by the signal of the hot water supply thermistor, the combustion amount of the hot water supply burner is controlled, and a large flow rate is automatically supplied to the bathtub by a control signal (feedback) of the water supply detection element. Automatic hot water supply to the bathtub to reach the hot water supply temperature (desired bath boiling temperature), and the hot water supply flow control valve is closed at an arbitrary set amount according to the signal from the water supply detection element to stop the automatic hot water supply and to reheat the hot water. It is completed only by the automatic hot water supply operation without using the hot water, and when the water temperature is low during the automatic hot water supply in the bathtub or when the water temperature is low in the winter or when multiple hot water bottles are used, the hot water supply capacity is exceeded and the specified amount is specified by the signal from the water supply detection element. In the case of the integrated measurement of, the control circuit signal opens the additional heating solenoid valve to simultaneously burn the additional heating burner and rotate the pump to circulate hot water. As well as automatic hot water into the bathtub while, at high temperatures feed water operation by controlling the hot water supply flow control valve in the control signal of the water supply sensing element to a small flow rate,
The following effects can be obtained by configuring the control circuit so that high-temperature hot water is supplied through the bathtub automatic hot water supply passage.

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

Since the bath temperature can be controlled by proportional control,
Energy saving can be achieved compared to hot water temperature control by Hi-Lo-OFF or ON-OFF control.

As the bathtub automatic hot water supply function and the bathtub automatic hot water supply function are built into the main body, it is possible to reduce the cost and make installation free to improve the workability and not to impair the aesthetics of the building. .

By using the water supply detection element as a water quantity sensor that counts the amount of water supplied, it is possible to open and close the hot water supply flow control valve and set the large and small flow rates, and it is possible to detect the amount of ignition / extinguishing water as in the past. it can.

Since the hot water can be supplied automatically with the lid on the bathtub, there is no need to boil the bath, which saves energy and is economical.

Even if the hot water supply (end device) is used to collect hot water, the hot water supply flow rate control valve provided in the bathtub automatic hot water supply passage is controlled to a large flow rate to automatically supply hot water to the bathtub, thereby achieving the desired bath boiling temperature. Since it can be completed only by the automatic hot water supply operation without the additional heating operation, the bath boiling time is shortened by that much, and the hot water supply flow control valve is closed at any set amount to stop the automatic hot water supply in the bathtub. As a result, it is economical and you can use the bath comfortably.

When there is residual hot water below the specified temperature in the bathtub, or when the bath is cooled during bathing, the hot water supply flow rate control valve provided in the bathtub automatic hot water supply passage is controlled to a small flow rate to supply high temperature hot water Since it can be controlled by the hot water supply burner having a large capacity by performing the passage through the passage, it is possible to raise the temperature in a short time and there is no risk of burns because high temperature hot water is not supplied from the hot water supply cullan.

By freely selecting and controlling the automatic hot water supply function, automatic high-temperature hot-water supply function, and automatic reheating function, you can have an economically comfortable bath life.

Unlike the conventional fixed type, the amount of hot water supplied to the bathtub during automatic hot water supply can be set arbitrarily, unlike the conventional fixed type, so it is possible to stop automatic hot water supply to the bathtub and detect the water level in the bathtub. Doesn't require a water level sensor.

When the bath water temperature is low during the automatic bath hot water supply, such as during the winter season, or because the hot water supply plug is used more than the hot water supply capacity, the signal from the thermistor for hot water supply becomes lower than the set temperature for automatic hot water supply, causing a deviation from the desired bath boiling temperature. In the case of a large amount, a water supply detection element that calculates and measures the water supply amount provided in the water supply passage allows the specified amount (for example, about 80% of the water amount of 1/3 to 1/2 of the bathtub).
~ 100) is cumulatively measured, the pump is also rotated to circulate hot water, the solenoid valve for additional heating is opened by the operation of the circulating water detection element, and the additional burner is also burned at the same time to add additional heating operation. The bath water temperature is controlled by controlling the bath water temperature automatically, and the hot water flow rate control valve is closed at an arbitrary set amount by the integrated measurement of the water supply detection element to raise the bath water temperature to the desired level. The automatic hot water supply and the automatic hot water supply can be stopped in a short time up to the set temperature, so the bath boiling time will be shortened, and you can have an economically comfortable bath life.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater with additional heating function showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the control circuit, FIG. 3 is a characteristic diagram of hot water supply capability, and FIG. FIG. 5 is a schematic view of driving the hot water supply flow rate control valve, FIG. 5 is a front view of the remote controller, FIG. 6 and FIG.
FIG. 8 is a flow chart, and FIG. 8 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, 24 …… hot water supply flow control valve, 27…
… Control circuit (control section), 28 …… Remote control, 30 …… Bathtub automatic hot water supply passage.

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 an additional heating solenoid valve branched and connected from the proportional control valve to each of the desired hot water supply burner and additional heating burner, and a hot water supply heat exchanger provided at the outlet of the hot water supply heat exchanger. A hot water thermistor for detecting the hot water temperature and an additional heat thermistor for detecting the circulating hot water provided at the entrance of the heat exchanger for additional heating,
A hot water supply flow rate control valve provided in a hot water supply passage for a bathtub that branches from a hot water supply passage downstream of the hot water supply thermistor and connected to a bathtub, and a water supply detection for calculating and measuring the amount of water supply provided in the water supply passage of the hot water supply heat exchanger An 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 operates the proportional control valve according to a control signal arithmetically processed by the signal of the hot water supply thermistor, Control the combustion amount of the hot water supply burner to the bathtub and automatically supply hot water to the bathtub by the control signal (feedback) of the water supply detection element so that the hot water temperature can reach the desired hot water temperature (desired bath boiling temperature). The hot water supply flow rate control valve is closed at an arbitrary set amount according to the signal of the element to stop the automatic hot water supply of the bathtub and complete the automatic hot water supply operation without the additional heating operation. When the water temperature is low during the hot water, such as during winter, or the hot water supply capacity is exceeded due to the use of multiple taps in the hot water supply, and the specified amount is cumulatively measured by the signal from the water supply detection element, the additional signal is output by the control circuit. The solenoid valve for heating is opened to burn the additional burner at the same time, and the pump is also rotated to automatically supply hot water to the bathtub while circulating hot water, and at the time of high-temperature hot water operation, the hot water is supplied by the control signal of the water supply detection element. Control the flow rate control valve to a small flow rate,
A hot water heater with a reheating function, wherein the control circuit is configured so that hot hot water is supplied through the bathtub automatic hot water supply passage.