JPH0154623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a gas instantaneous water heater, and more particularly to a control device for a gas instantaneous water heater, and in particular a gas combustion means for burning gas supplied through a gas supply pipe, and a gas combustion means interposed in the gas supply pipe. and an electromagnetic gas supply amount adjusting means that has an electromagnetic coil and adjusts the amount of gas supplied according to the amount of power supplied to the electromagnetic coil, and the gas combustion means that controls the amount of water supplied through the water supply pipe. a heat exchange means for receiving and heating combustion gas from the
Suitable for use in a gas instantaneous water heater, which is equipped with a hot water supply pipe for supplying hot water from the heat exchange means and a hot water supply amount adjusting means provided in the hot water supply pipe for regulating the amount of hot water dispensed. This invention relates to an electrical control device.

Conventionally, in this type of gas instantaneous water heater, for example, in the case of a stop-start type, the hot water output amount adjusting means is installed at a position apart from the water heater main body, so that there is no water from the hot water output amount adjusting means. In order to adjust the hot water temperature to a desired temperature in relation to the amount of hot water coming out, the flow rate of water in the water supply pipe is controlled by a flow rate control means interposed in the water supply pipe in the water heater main body. It was inconvenient to have to adjust the In order to solve this problem, it is conceivable to control the hot water temperature to the desired hot water temperature by changing the amount of gas adjustment by the electromagnetic gas supply amount adjusting means in relation to the amount of hot water coming from the hot water amount adjusting means. However, in such a case, if the amount of gas adjusted by the electromagnetic gas supply amount adjusting means has a limit and is insufficient compared to the amount of hot water coming out from the hot water amount adjusting means, the hot water temperature is changed to the desired hot water temperature. There is a problem that it cannot be maintained. It is also conceivable to control the outlet hot water temperature to the desired hot water temperature by changing the amount of water supplied to the heat exchange means in relation to the temperature difference between the outlet hot water temperature and the desired hot water temperature. There is a problem in that when the amount is restricted too much, a situation occurs in which the gas instantaneous water heater is used at a capacity range lower than its maximum capacity.

The present invention has been made in response to these problems, and its purpose is to maintain the hot water outlet temperature at a desired temperature in a state where the gas instantaneous water heater can always exert its maximum capacity. An object of the present invention is to provide an electric control device for a gas instantaneous water heater that electrically controls the amount of hot water and the amount of gas supplied to a gas combustion means.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows an example in which the electric control device according to the present invention is applied to a stop-start type gas instantaneous water heater.
This gas instantaneous water heater includes a gas burner 11 that is disposed within the appliance body and burns gas supplied through the gas supply line 10. An electromagnetic proportional control valve 12 is provided. The electromagnetic proportional control valve 12 controls its opening in proportion to the duty ratio of the voltage applied to the electromagnetic coil, thereby adjusting the amount of gas supplied to the gas burner 11 through the gas supply pipe 10. The heat exchanger 14 is located above the gas burner 11 within the appliance body, and heats water supplied from the water supply pipe 13 to a desired hot water temperature using combustion gas from the gas burner 11. Note that the desired hot water temperature has a unique relationship with the amount of combustion gas from the gas burner 11 (that is, the amount of gas supplied to the gas burner 11).

The flow rate control valve 15 is of a rotary type, and is interposed in the water supply pipe 13 located in the main body of the device between the water governor 16 and the bench lily 17, and is arranged in the water supply pipe 13 according to its opening degree. control the flow rate of water.
The water governor 16 is installed in the water supply pipe 13 upstream of the flow control valve 15, and works in cooperation with a bench lily 17 installed in the water supply pipe 13 downstream of the flow control valve 15. , the water supply pressure to the flow rate control valve 15 is maintained constant. The tapping pipe 18 supplies hot water from the heat exchanger 14 to the first stopper 19, and the first stopper 19 adjusts the amount of hot water discharged according to its opening degree. In addition, in FIG. 1, the reference numeral 10a
shows a main stopper inserted in the gas supply pipe 10, and this main stopper 10a is formed of a solenoid valve,
In response to the excitation (or demagnetization), it opens (or closes) to permit (or shut off) gas supply to the electromagnetic proportional control valve 12 via the gas supply pipe 10.

The electric control device includes a temperature setting device 20, a flow rate sensor 30, a water temperature sensor 40, a hot water temperature sensor 50, first and second position sensors 60, 70, and electric circuits connected to these setting device 20 and sensors 30 to 70. It is equipped with 80. The temperature setting device 20 consists of a variable resistor placed in a part of the device body so that it can be easily operated from the outside, and is used when it is necessary to set the desired hot water temperature T _SET for heating the heat exchanger 14. When operated, the desired hot water temperature T _SET is generated as a set temperature signal. The flow rate sensor 30 is interposed in the water supply pipe 13 upstream of the water governor 16, detects the flow rate Q of water flowing through the water supply pipe 13 per predetermined time, and has a frequency proportional to this flow rate Q. Generated as a flow signal.
The water temperature sensor 40 consists of a thermistor installed in the water supply pipe 13 downstream of the bench lily 17, detects the actual temperature T _io of the water flowing through the water supply pipe 13, and generates this as a water temperature signal. Outlet hot water temperature sensor 5
0 consists of a thermistor installed in the hot water tap line 18, detects the actual temperature _Tput of hot water flowing through the hot water tap line 18, and generates this as a hot water tap temperature signal. The first position sensor 60 is a normally closed limit switch disposed at the fully closed position of the flow control valve 15, and this limit switch opens in response to the fully closed position of the flow control valve 15 to generate a first position signal. The second position sensor 70 consists of a normally closed limit switch disposed at the fully open position of the flow control valve 15, and this limit switch opens in response to the fully open position of the flow control valve 15 and generates a second position signal.

As shown in FIG. 2, the electric circuit 80 includes a waveform shaper 81a that shapes the flow rate signal from the flow rate sensor 30 to generate a shaped signal;
A frequency-voltage converter 81b (hereinafter referred to as F-V) converts the frequency of the shaped signal from 1a into an analog voltage.
converter 81b) and F-V converter 81b.
a comparator 82b that generates a low level signal (or a high level signal) when the analog voltage from the lower limit setter 82a (i.e., the actual flow rate Q) is higher (or lower) than the value of the lower limit flow rate signal from the lower limit setter 82a; 82
Low level signal (or high level signal) from b
The main plug drive circuit 82c generates an excitation signal (or demagnetization signal) necessary to excite (or demagnetize) the main plug 10a and applies it to the main plug 10a in response to the above. Note that the lower limit setter 82a generates the lower limit flow rate (for example, 3/min) controlled by the apparatus of the present invention as the lower limit flow signal.

The electric circuit 80 also includes a subtracter 83a that generates a temperature difference signal by subtracting the value T _io of the water temperature signal from the water temperature sensor 40 from the value T _SET of the set temperature signal from the temperature setting device 20, and a capacity setting device 83b. Divided by the value of the maximum capacity setting signal (T _SET − T _io ) from
This division result is applied to the heat exchanger 14 based on T _put = T _SET .
The temperature difference signal from the subtracter _83a is sent to a multiplier together with the analog voltage from the F-V converter 81b. 83
d, and the maximum flow rate signal from the divider 83c is applied to the subtracter 83e together with the analog voltage from the F-V converter 81b. In such a case, the capacity setting device 83b generates the maximum gas supply amount W to the gas burner 11 as the maximum capacity setting signal.
Also, the functional relationship Q _n = W/(T _SET − T _io ) is
It is determined by the capacity of the gas instantaneous boiler. However, the units of Q _n , W, T _SET , and T _io are /min, kcal/min, °C, and °C, respectively. Multiplier 8
3P multiplies the analog voltage from the F-V converter 81b (that is, the actual flow rate Q) by the value of the temperature difference signal (T _SET - _Tio ) from the subtractor 83a, and generates this multiplication result as a heating amount signal. do. In this case, the value of the heating amount signal from the multiplier 83d corresponds to the heating capacity required for the water having the temperature T _io and the flow rate Q to reach the set temperature T _SET . The subtracter 83e is the divider 8
The value of the maximum flow rate signal from 3c is converted to the F-V converter 81.
b is subtracted from the analog voltage from b, and the result of this subtraction is generated as a flow rate difference signal.

The subtracter 84a subtracts the value of the set temperature signal from the temperature setting device 20 from the value of the outlet hot water temperature signal from the outlet hot water temperature sensor 50, and generates this as a temperature difference signal.
The integrator 84b integrates the value of the temperature difference signal from the subtractor 84a over time and generates this as an integral signal. Comparator 84d compares the temperature difference signal from subtractor 84a with the temperature difference limit signal generated from temperature difference limit setter 84c, and when the value of the temperature difference signal is higher (or lower) than the value of the temperature difference limit signal. Generates a high level signal (or low level signal). In such a case, the value of the temperature difference limit signal from the temperature difference limit setter 84c is the judgment reference value ((T _put - T _SET ) necessary for sudden control to realize T _put = T _SET when (T put - T SET ) is too large. For example, 2°C).

The subtracter 85a subtracts the value of the integral signal from the integrator 84b from the value of the heating amount signal from the multiplier 83d, and generates the result of this subtraction as a gas amount signal.
Comparator 85c compares the flow rate difference signal from subtractor 83e with the capacity limit signal generated from capacity limit setter 85b, and outputs a high level signal when the value of the flow rate difference signal is higher (or lower) than the value of the capacity limit signal. (or low level signal). In such a case, the value of the capability limit signal from the capability limit setter 85b is T _put
= Corresponds to the predetermined flow rate value necessary to determine whether T _SET can be maintained. This means that comparator 85c
High level signal (or low level signal) from
However, depending on the actual flow rate Q, T _put =T _SET cannot be maintained (or can be maintained). The selection circuit 85d selects and generates the gas amount signal from the subtracter 85a in response to the low level signal from the comparator 85c, and also selects and generates the gas amount signal from the subtracter 85a in response to the high level signal from the comparator 85c. This is generated by selecting the maximum capacity setting signal from .

The selection circuit 86d selects a signal from the subtracter 84a under the control of an OR gate 86c responsive to a low level signal from a comparator 84d, or under the control of an inverter 86b and an OR gate 86c responsive to a high level signal from a comparator 85c. selects and generates a temperature difference signal of The maximum flow signal resulting from maximum flow setter 86a is selected and generated under control. In such a case, the value of the maximum flow signal from the maximum flow rate setter 86a defines the fully open position of the flow control valve 15.

The selection circuit 87b selects and generates the gas amount signal or the maximum capacity setting signal from the selection circuit 85d in response to the low level signal from the comparator 84d, and also responds to the high level signal from the comparator 84d. Then, the minimum capacity setting signal generated from the capacity setting device 87a is selected and generated. In such a case, the value of the minimum capacity setting signal from the capacity setting device 87a corresponds to the minimum amount of gas supplied to the gas burner 11. The duty signal generator 87c receives a gas amount signal from the selection circuit 87b, a maximum capacity setting signal,
Alternatively, one of the values of these signals is generated as a duty signal in response to the minimum capacity setting signal. The drive circuit 87d is a duty signal generator 8
In response to the duty signal from 7c, a drive signal necessary to define the amount of current flowing through the electromagnetic coil of the electromagnetic proportional control valve 12 is generated. This means that the amount of current flowing through the electromagnetic coil of the electromagnetic proportional control valve 12 changes in proportion to the value of the drive signal from the drive circuit 87d (i.e., the voltage duty ratio), and the opening degree of the electromagnetic proportional control valve 12 changes in proportion to the value of the drive signal from the drive circuit 87d. This means that the amount of current flowing through the electromagnetic coil changes proportionately.

The motor drive circuit 88, as shown in FIG.
DC commutator motor M, both position sensors 60, 70,
Transistors 8 having the same characteristics are connected to the comparator 82b and the selection circuit 86d, and are connected to the DC commutator motor M as shown in FIG.
8c, 88d, 88e, and 88f. Transistor 88c has a base resistor 8 at its base.
It is connected to a selection circuit 86d via a diode 8a and to a comparator 82b via a diode 88b. Further, the transistor 88c has its emitter connected to the first input terminal of the DC commutator motor M, and its collector connected to the positive terminal of the DC power supply (having a power supply voltage +Vcc). The base and emitter of the transistor 88d are connected to the base and emitter of the transistor 88c, respectively, and the collector of the transistor 88d is grounded via the first position sensor 60.

The transistor 88e has its emitter connected to the second input terminal of the DC commutator motor M, and its collector connected to the collector of the transistor 88c, and a resistor 88g is connected between the base and collector of the transistor 88e. has been done. The transistor 88f has its base and emitter connected to the base and emitter of the transistor 88e, respectively, and its collector is grounded via the second position sensor 70.
The base of the transistor 88f and the second position sensor 7
0, a resistor 88h (having the same resistance value as the low resistor 88g) is connected.

In the motor drive circuit 88 configured in this way, if the comparator 82b generates a high level signal while the second position sensor 70 is not generating the second position signal, the transistor 88d
At the same time as becomes non-conductive, the transistor 88c becomes conductive, and the current supplied from the DC power source flows to the transistor 88.
Collector/emitter of c, DC commutator motor M,
A positive current flows through the emitter-collector of transistor 88f and second position sensor 70. Further, when the comparator 82b is generating a low level signal in a state where both position sensors 60 and 70 are not generating position signals, the selection circuit 86
If the value of the temperature difference signal (T _put −T _SET ) from d is positive, a positive current flows as described above, and if the value of the temperature difference signal (T _put −T _SET ) is negative, the transistor 88d is conductive when the transistor 88c is non-conducting, and the current supplied from the DC power source flows through the transistor 88c.
8e, DC commutator motor M, transistor 88d
and flows as a reverse current through the first position sensor 60, and if the value of the temperature difference signal (T _put - T _SET ) is zero, the transistors 88c to 88f are all non-conductive, and the current supplied to the DC commutator motor M becomes non-conductive. Prohibit influx. Note that the transistors 88e and 88f
are normally non-conductive in relation to the resistors 88g and 88h, respectively.

The DC commutator motor M is disposed within the instrument body and is operatively connected to the flow control valve 15, and rotates in the forward direction in response to the forward current to increase the opening degree of the flow control valve 15. It rotates in the opposite direction in response to the reverse current to reduce the opening of the flow control valve 15, and stops when the forward and reverse currents disappear to set the opening of the flow control valve 15 to the optimum value. to hold.

In this embodiment configured as described above, the water tap (not shown) is opened, and the desired hot water temperature T _SET is set using the temperature setting device 20. At this time, it is assumed that both position sensors 60 and 70 are not generating position signals. If the stopcock 19 is fully opened at this stage, water from the faucet will flow to the flow rate sensor 3.
0, becomes a constant pressure water flow under the cooperation of the water governor 16 and the bench lily 17, passes through the flow rate control valve 15, is supplied to the heat exchanger 14 via the water temperature sensor 40, and is then supplied to the heat exchanger 14 via the water temperature sensor 40. Hot water pipe 18
and flows out from the first stopcock 19. In addition, by cooperating with the flow rate sensor 30 and waveform shaper 81a,
The analog voltage generated from the converter 81b is applied to the comparator 8.
2b, multiplier 83d, subtracter 83e,
The value _Tio of the water temperature signal from the water temperature sensor 40 is subtracted from the value _TSET of the set temperature signal from the temperature setting device 20.
3a to generate a temperature difference signal, which is applied to the divider 83c and the multiplier 83d, and the value T _SET of the set temperature signal from the temperature setting device 20 is the value T of the output hot water temperature signal from the output hot water temperature sensor 50. It is subtracted from _put by a subtracter 84a, generated as a temperature difference signal, and applied to an integrator 84b, a comparator 84d, and a selection circuit 86d.

As described above, when the analog voltage from the F-V converter 81b is applied to the comparator 82b, if the analog voltage is higher than the lower limit flow value from the lower limit setter 82a, the comparator 82b generates a low level signal. In response to this, an ignition device (not shown) performs an ignition operation, and at the same time, the main valve 10a is excited by the main valve drive circuit 82c and opens to supply gas to the electromagnetic proportional control valve 12 through the gas supply pipe 10. After that, the ignition device is stopped when the ignition confirmation device confirms ignition. Further, as described above, when the temperature difference signal from the subtracter 83a is applied to the divider 83c and the multiplier 83d, the multiplier 83d
A subtracter 83 is added to the analog voltage from the V converter 81b.
Multiply the value of the temperature difference signal from a and generate this multiplication result as a heating amount signal, and divider 83c
divides the value of the maximum capacity setting signal from the capacity setter 83b by the value of the temperature difference signal from the subtracter 83a and generates this division result as the maximum flow rate signal, and the subtractor 83e generates the maximum capacity setting signal from the divider 83c. The value of the flow rate signal is subtracted from the analog voltage from the F-V converter 81b, and the result of this subtraction is generated as a flow rate difference signal.

Further, as described above, when the temperature difference signal from the subtractor 84a is applied to the integrator 84b and the comparator 84d, the integrator 84b integrates the value of the temperature difference signal from the subtractor 84a with respect to time. The temperature difference signal from the subtractor 84a is generated as an integral signal, and at this stage, the temperature difference signal from the subtractor 84a is generated as an integral signal.
If the value is lower than the temperature difference limit signal from 4c, comparator 84d generates a low level signal. Then, the subtracter 85a subtracts the value of the integral signal from the integrator 84b from the value of the heating amount signal from the multiplier 83d, and generates the result of this subtraction as a gas amount signal. Further, as described above, when the maximum flow rate signal is generated from the subtractor 83e, the comparator 85c generates a low level signal if the value of the maximum flow rate signal is lower than the value of the capacity limit signal from the capacity limit setter 85b.

Next, the selection circuit 85d selects the gas amount signal from the subtracter 85a in response to the low level signal from the comparator 85c and applies it to the selection circuit 87b.
Then, the selection circuit 87b selects the gas amount signal from the selection circuit 85d in response to the low level signal from the comparator 84d, and selects the gas amount signal from the duty signal generator 8.
Granted to 7c. Thereafter, the duty signal generator 87c generates the value of the gas amount signal as a duty signal in response to the gas amount signal from the selection circuit 87b. For this reason, the electromagnetic proportional control valve 12
However, under the control of the drive circuit 87d that responds to the duty signal from the duty signal generator 87c, the electromagnetic coil receives an amount of current defined by the value of the duty signal and increases its opening degree. , gas is supplied to the gas burner 11 for ignition and combustion.

On the other hand, the selection circuit 86d sets the maximum flow rate under the control of the OR gate 86c that responds to the low level signal from the comparison path 84c and the control of the inverter 86b and OR gate 86c that respond to the low level signal from the comparator 85c. The maximum flow rate signal from the device 86a is selected and applied to the motor drive circuit 88. Then, the motor drive circuit 88 operates the maximum flow rate setter 86 under the generation of the low level signal from the comparator 82b.
In relation to the value of the maximum flow rate signal from a, the positive direction current is generated and the DC commutator motor M is rotated in the forward direction. Therefore, the flow rate control valve 15 increases its opening degree to increase the amount of water supplied from the water supply pipe 13 to the heat exchanger 14. Note that when the flow rate control valve 15 is fully opened, the second position sensor 70 is opened and the second position sensor 70 is opened.
A position signal is generated, in response to which the DC commutator motor M is stopped due to the disappearance of its forward current.

As explained above, both comparators 84d and 85c
When both are generating low level signals, water is supplied to the heat exchanger 14 with the flow rate control valve 15 fully open to heat it, and this heated water passes through the hot water tap pipe 18 and the stopcock 19. Take a bath. In such a case, the temperature T _put of the hot water discharged from the stopcock 19 is maintained at the desired hot water temperature T _SET based on the amount of gas supplied to the gas burner 11 corresponding to the opening degree of the electromagnetic proportional control valve 12 defined as described above. Ru.

In addition, in the above explanation of the operation, the comparator 84
When a high level signal is generated from d, the selection circuit 86
d is the maximum flow rate setting device 8 in the same manner as described above.
The maximum flow rate signal from 6a is applied to the motor drive circuit 88 to maintain the flow rate control valve 15 in the fully open state.
On the other hand, the selection circuit 87b selects the minimum capability setting signal from the capability setter 87a in response to the high level signal from the comparator 84d and applies it to the duty signal generator 87c. Then, the duty signal generator 87c generates the value of the minimum capacity setting signal as a duty signal, and in response, the electromagnetic proportional control valve 12 uses its electromagnetic coil to generate a duty signal that is regulated by the value of the duty signal. In response to the amount of current, the opening degree is rapidly reduced to the minimum value, and the gas burner 11
Rapidly reduce the gas supply amount to the minimum value. As a result, the temperature T _put of hot water discharged from the first stopper 19 rapidly decreases toward the desired hot water temperature T _SET .

In addition, in the above explanation of the operation, the comparator 85
When a high-level signal is generated from signal c, the selection circuit 85d selects the maximum capacity setting signal from the capacity setting device 83b and applies it to the selection circuit 87b. Then, in response to the low level signal from the comparator 84d, the selection circuit 87b selects the maximum capacity setting signal from the selection circuit 85d and applies it to the duty signal generator 87c. The device 87c generates the value of the maximum capacity setting signal as a duty signal. Therefore, the electromagnetic proportional control valve 12 increases its opening degree to the maximum value in response to the amount of current specified by the value of the duty signal from the duty signal generator 87c in its electromagnetic coil, and the gas to the gas burner 11 is increased. Increase supply to maximum value. On the other hand, selection circuit 8
6d controls an OR gate 86c responsive to a low level signal from a comparator 84d and a comparator 85c.
Inverter 86 responsive to a high level signal from
b and subtractor 84 under the control of OR gate 86c.
The motor drive circuit 8 selects the temperature difference signal from a.
Granted to 8. However, in such a state, since the value of the temperature difference signal from the subtractor 84a is negative, the motor drive circuit 88 generates a reverse current as described above to drive the DC commutator motor M in the reverse direction. The amount of water supplied to the heat exchanger 14 is decreased by rotating the flow rate control valve 15 to reduce the opening degree of the flow rate control valve 15. As a result, the amount of hot water discharged from the stopcock 19 is limited by the opening degree of the flow control valve 15, but the hot water temperature _Tput is maintained at the desired hot water temperature _TSET .

In addition, in the explanation of the operation described above, when the water tap is closed, the analog voltage from the F-V converter 81b decreases to almost zero level, so the comparator 82
b generates a high level signal, and in response to this, the main valve 10a is demagnetized and closed under the control of the main valve drive circuit 82c, cutting off the gas supply to the electromagnetic proportional control valve 12. Further, the motor drive circuit 88 is connected to the comparator 8.
The positive direction current is generated in response to the high level signal from 2b, and the flow control valve 15 is fully opened under the control of the DC commutator motor M.

Further, in the above embodiments, an example in which the present invention is applied to a stop-start type gas instantaneous water heater has been described, but the present invention is not limited to this, but can be applied to various types of gas instantaneous water heaters. In such a case, the temperature setting device 20 may be provided at a location apart from the entire appliance and remotely controlled.

Further, in the above embodiment, the duty signal generator 87c and the drive circuit 87d control the opening degree of the electromagnetic proportional control valve 12 so as to be proportional to the duty ratio of the voltage. The opening degree of the electromagnetic coil may be controlled to be proportional to the amount of current flowing into the electromagnetic coil.

Further, in the embodiment described above, an example was explained in which the first and second position sensors 60 and 70 were respectively arranged at the fully closed position and the fully open position of the flow control valve 15. The first position sensor 60 may be arranged at the opening position of the flow control valve 15 immediately before it is fully closed, and the second position sensor 70 may be arranged at the opening position of the flow control valve 15 immediately before it is fully opened.

As explained above, in the present invention, as exemplified in the above embodiment, a gas combustion means for burning gas supplied through the gas supply pipe,
an electromagnetic gas supply amount adjusting means which is interposed in the gas supply pipe and has an electromagnetic coil and adjusts the supply amount of the gas according to the amount of power supplied to the electromagnetic coil; a heat exchange means for receiving and heating the supplied water with combustion gas from the gas combustion means; a hot water tap line for receiving hot water from the heat exchange means and tapping the hot water; Applied to a gas instantaneous water heater equipped with a hot water supply amount adjusting means for adjusting the amount of hot water dispensed, the hot water supply method is operated to set the temperature of hot water from the hot water supply regulating means to a desired hot water temperature. temperature setting means for generating a signal; water temperature detection means for detecting the actual temperature of water in the water supply pipe and generating the detected water temperature as a water temperature signal; a flow rate detection means for detecting the flow rate and generating the detected flow rate as a flow rate signal; and a hot water temperature detection means for detecting the actual temperature of the hot water in the hot water supply pipe and generating the detected hot water temperature as a hot water temperature signal. ,
The setting signal and the water temperature are determined based on a functional expression representing the relationship among the maximum flow rate of water to be supplied to the heat exchange means, the actual temperature of the water, the desired hot water temperature, and the maximum value of the gas supply amount. The maximum flow rate is calculated according to the signal, and the flow rate difference between the value of the flow rate signal and the calculated maximum flow rate is supplied to the heat exchange means in such a state that the value of the hot water temperature signal can be maintained at the desired hot water temperature. When the flow rate of the water to be used is less than a predetermined flow rate, the product of the difference between the value of the water temperature signal and the value of the set temperature signal and the value of the flow rate signal is generated as a first output signal and supplied to the heat exchange means. The maximum flow rate of water is generated as a second output signal, and when the flow rate difference is greater than the predetermined flow rate, the maximum value of the gas supply amount is generated as a third output signal, and the value of the water temperature signal and the setting are generated. arithmetic means for generating a temperature difference between the temperature signal and the temperature signal as a fourth output signal;
or a first drive means that responds to a third output signal to generate the power supply amount defined by the value of the output signal as a first drive signal and applies it to the electromagnetic coil; a second drive means for generating the value of the output signal of the lever as a second drive signal and generating a third drive signal necessary to decrease the value of the output signal in response to the fourth output signal; a flow rate that controls the flow rate of water to be supplied to the heat exchange means in response to the second or third drive signal so as to match the maximum flow rate or the flow rate that can maintain the value of the hot water temperature signal at the desired hot water temperature; Its structural feature lies in the fact that it is equipped with a control means. Thereby, if the value of the flow rate signal is small due to the maximum amount of water supplied to the heat exchange means that can maintain the temperature of the tapped water at the desired hot water temperature, the value of the flow rate signal x (the value of the water temperature signal) The amount of gas determined by the relationship between the difference between the temperature signal and the value of the set temperature signal is supplied to the gas combustion means, and the maximum amount of water is supplied to the heat exchange means, and the flow rate signal is determined based on the maximum water supply amount described above. If the value of is large, the maximum amount of gas is supplied to the gas combustion means, and the amount of water supplied to the heat exchange means is reduced in order to reduce the difference between the value of the hot water temperature signal and the value of the set temperature signal. As a result, the amount of hot water discharged and the amount of gas supplied to the gas combustion means can be adjusted to maintain the hot water temperature at a desired temperature in a state where this type of gas instantaneous water heater can always exhibit its maximum capacity.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the device of the present invention applied to a gas instantaneous water heater, Fig. 2 is a detailed block diagram of the electric circuit in Fig. 1, and Fig. 3 is a detailed block diagram of the motor drive circuit in Fig. 2. It is a circuit diagram. Explanation of symbols, 10...Gas supply pipe, 11...
Gas burner, 12... Solenoid proportional control valve, 14...
Heat exchanger, 15... Flow control valve, 18... Hot water tap line, 19... Stopcock, 20... Temperature setting device, 30
...Flow rate sensor, 40...Water temperature sensor, 50...
Outlet hot water temperature sensor, 80...Electric circuit, M...DC commutator motor.

Claims (1)

[Claims] 1. A gas combustion means for burning the gas supplied through the gas supply pipe, and an electromagnetic coil interposed in the gas supply pipe, which burns the gas according to the amount of power supplied to the electromagnetic coil. an electromagnetic gas supply amount adjustment means for adjusting the supply amount; a heat exchange means for receiving combustion gas from the gas combustion means to heat water supplied through the water supply pipe; In a gas instantaneous water heater, the gas instant water heater is equipped with a hot water supply pipe for dispensing hot water, and a hot water supply amount adjusting means provided in the hot water supply pipe for regulating the amount of hot water, the hot water being discharged from the hot water supply amount adjusting means is adjusted to a desired temperature. temperature setting means that is operated when setting the hot water temperature and generates the desired hot water temperature as a set temperature signal;
water temperature detection means for detecting the actual temperature of the water in the water supply pipe and generating the detected water temperature as a water temperature signal; A flow rate detection means for generating a flow rate signal; a hot water temperature detection means for detecting the actual temperature of the hot water in the outlet pipe and generating the detected hot water temperature as a hot water temperature signal; The maximum flow rate is determined in accordance with the set temperature signal and the water temperature signal based on a functional expression representing the relationship among the maximum flow rate of water, the actual temperature of the water, the desired hot water temperature, and the maximum value of the gas supply amount. The flow rate difference between the value of the flow rate signal and the calculated maximum flow rate is calculated from a predetermined flow rate of water to be supplied to the heat exchange means in a state where the value of the hot water temperature signal can be maintained at the desired hot water temperature. When the water temperature is low, the product of the difference between the value of the water temperature signal and the value of the set temperature signal and the value of the flow rate signal is generated as a first output signal, and the maximum flow rate of water to be supplied to the heat exchange means is generated as a second output signal. is generated as an output signal, and when the flow rate difference is greater than the predetermined flow rate, the maximum value of the gas supply amount is generated as a third output signal, and the temperature between the value of the hot water temperature signal and the value of the set temperature signal is generated. arithmetic means for generating the difference as a fourth output signal; and a calculation means for generating the power supply amount defined by the value of the output signal as a first drive signal in response to the first or third output signal, and generating the power supply amount defined by the value of the output signal as a first drive signal to the electromagnetic coil. a first drive means for providing a second drive signal in response to said second output signal and for decreasing the value of said output signal in response to said fourth output signal; a second driving means for generating a third driving signal;
a flow rate control means for controlling the flow rate of water to be supplied to the heat exchange means in response to a drive signal of the water so as to match the maximum flow rate or the flow rate that can maintain the value of the hot water temperature signal at the desired hot water temperature; An electric control device for a gas instantaneous water heater.