JPH0511860A - Hot and cold water mixing controller - Google Patents

Abstract

PURPOSE:To prevent large temperature variation just after the start of hot water supply and to supply mixed hot water in safety by energizing a mixing valve to a driving quantity just before last supplying is stopped when hot water begins to be supplied and opening a flow rate control opening/closing valve after a bias point corresponding to a flow rate after the water supplying is obtained. CONSTITUTION:When a signal for restarting hot water supplying is inputted from an opening/closing signal generating means 44 to a control means 18 after the hot water supplying is stopped, a mixing valve control means 39 judges the start of specific hot water supplying under temperature control and sets the momentum of a mixing valve driving means 24 to the driving quantity when a flow rate is large in last stop processing in the beginning of the start of the hot water supplying according to a value from a storage means 43. The flow rate control valve 20 is opened after the driving quantity is sent to the mixing valve. The control valve 18 normally performs sampling control, so the start of the hot water supplying ends at next sampling time, so normal temperature control is only performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing controller for adjusting the mixing ratio of hot water and water to obtain an optimum mixed hot water temperature.

[0002]

2. Description of the Related Art Conventionally, there is a hot and cold water mixing apparatus of this type as shown in FIG. 10 (for example, Japanese Patent Laid-Open No. 1-31227).
No. 9). In FIG. 10, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water valve body 4, a hot water valve seat 5 for reducing the primary pressure PH1 of the hot water flow path 1, and a primary pressure P of the hot water flow path 2.
Water side valve body 6 for depressurizing C1, water side valve seat 7, and hot water side valve body 4
And a valve shaft 8 that connects the water side valve body 6 with the hot water
The piston 9 is operated by the pressure difference between the secondary pressures PH1 and PC1. Then, even if the pressure of the hot water or water suddenly changes, the automatic pressure regulating valve 3 moves by the pressure, and the secondary pressure P of the hot water and water
It works so that H2 and PC2 are always kept equal.
Further, a bias means 10 is provided on the valve shaft 8. The bias means 10 is connected to an end portion of the valve shaft 8 and is provided so as to sandwich the bobbin 11 and the coil 12 wound around the bobbin 11 and insulated. The permanent magnet 13 and the coil 12 is connected to the control means 18 via the flexible portion 14.
It is connected to the.

When a current is passed from the control means 18 to the coil 12, the current crosses the magnetic field generated by the permanent magnet 13, so that a bias force is applied to the valve shaft 8 according to Fleming's law. Therefore, the automatic pressure adjustment point is displaced by the amount of the bias force, and for example, the secondary pressure PH2 of the hot water and the water is constantly regulated at the point of 2: 1 and, as a result, the hot water temperature rises. . In this way, the temperature of the mixed hot water is changed by changing the current to the coil 12. The control means 18 superimposes a minute AC signal when passing a current through the coil 12.
This is to reduce the hysteresis characteristic of the magnetic circuit of the bias means 10 and the sliding resistance at the start of driving. Reference numeral 19 denotes a mixing section of hot water and water. After mixing, the hot water is discharged via the flow rate control on-off valve 20, the temperature of which is detected by the mixed hot water temperature detecting means (for example, thermistor) 15 and the flow rate thereof is detected by the flow rate detecting means 16. The control means 18 biases the bias means 10 and the flow rate control on-off valve drive means 21 to adjust the temperature so as to match the value of the setting means 17.

[0004]

However, in the above-mentioned structure, when the flow rate control on-off valve 20 is closed, the pressure of the mixing section 19 is changed, the balance of the automatic pressure regulating valve is lost, and the outlet water temperature is largely changed. Will end up. If the water is stopped as it is, the temperature of the hot water remaining in the vicinity of the mixing portion changes drastically when the hot water is discharged next time, which is uncomfortable. To prevent this, if the temperature of the mixed hot water is controlled until the hot water is stopped, the automatic pressure regulator moves to the balance point at the minute flow rate immediately before the stop, so if the hot water is restarted in this state, the flow rate will suddenly increase. However, the control means 18 for adjusting the balance point of the automatic pressure regulating valve cannot adjust the current supplied to the coil 12 in time. Therefore, a large amount of mixed hot water whose temperature is not fixed may come out at a large flow rate, which is dangerous.

The present invention solves the above-mentioned conventional problems. When tapping hot water, the driving amount of the mixing valve drive means is returned to the driving amount before the previous stop processing, and tapping is started to perform mixing immediately after tapping. The first purpose is to stabilize the hot water temperature.

Further, a second object of the present invention is to stop the drive amount of the mixing valve driving means the last time when starting the tapping in consideration of the dead time such as the flow path delay and the detection delay of the mixed hot water temperature detecting means. The purpose is to return to the drive amount before carrying out, and to maintain this drive amount until a certain time has elapsed to obtain a stable hot water mixture.

A third object of the present invention is that the convection and the like are generated immediately after the start of tapping, the temperature of the mixing portion is not uniform, and the flow velocity changes abruptly such that the mixing valve is hunting. In order to prevent such problems, when starting the hot water discharge, the drive amount of the mixing valve drive means is returned to the drive amount before the previous stop processing and then this drive amount is maintained until the temperature of the mixed hot water reaches a predetermined value. To get mixed hot water.

[0008]

In order to solve the above problems, a hot and cold water mixing control device of the present invention comprises a hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, A mixing valve drive means for driving the mixing valve, a flow rate control on-off valve, a flow rate control on-off valve drive means for driving the flow rate control on-off valve, and an on-off signal generation means for selecting opening and closing of the flow rate control on-off valve, The mixing valve drive means and the control means for outputting a drive signal to the flow rate control opening / closing valve drive means, respectively, the control means stopping the hot water discharge from the opening / closing signal generating means (closing the flow rate control on / off valve: flow rate 0). A configuration having storage means for storing a drive signal of the mixing valve drive means at the time of signal input, and mixing valve control means for outputting the drive signal of the storage means to the mixing valve drive means at the time of input of a hot water discharge start signal from the opening / closing signal generation means One in which the.

In order to achieve the second object, the hot and cold water mixing control device of the present invention comprises a hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, and the mixing valve. A mixing valve drive means for driving the
A flow rate adjusting on-off valve driving means for driving the flow rate adjusting on-off valve, an on-off signal generating means for selecting opening and closing of the flow rate adjusting on-off valve, a drive signal for each of the mixing valve driving means and the flow rate adjusting on-off valve driving means. And a storage means for storing a drive signal of the mixing valve drive means when the hot water output stop (flow rate control on / off valve is closed: flow rate is 0) signal is input from the open / close signal generation means. When the hot water start signal is input from the opening / closing signal generating means, a mixing valve control means for outputting the driving signal of the storage means to the mixing valve driving means for a certain period of time is provided.

In order to achieve a third object, the hot and cold water mixing control device of the present invention includes a hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, and the mixing. Mixing valve driving means for driving the valves, flow rate adjusting on-off valve, flow rate adjusting on-off valve driving means for driving the flow rate adjusting on-off valve, open-close signal generating means for selecting opening and closing of the flow rate adjusting on-off valve, and the mixing It comprises a valve drive means and a control means for outputting a drive signal to each of the flow rate control opening / closing valve drive means, and the control means inputs the hot water stop (closes the flow rate control on / off valve: flow rate 0) signal from the opening / closing signal generation means. At the time of inputting the hot water start signal from the storage means and the opening / closing signal generating means, the drive signal of the storage means is stored until the temperature signal of the mixed hot water temperature detecting means reaches a predetermined value. It is obtained by a structure having a mixing valve control means for outputting a joint driving means.

[0011]

According to the present invention, when the hot water discharge is started, the mixing valve is urged by the driving amount before the hot water is stopped last time so that the bias point corresponds to the flow rate after the hot water is discharged, and then the flow control valve is opened. It is intended to prevent a large temperature change immediately after tapping and after tapping. At the start of tapping, the mixing valve is urged with the drive amount before it was stopped last time so that the bias point corresponds to the flow rate after tapping, and the flow control valve is opened to start tapping The amount is held and the detection delay of the mixed hot water temperature detection means immediately after the hot water is taken into consideration. At the start of tapping, the mixing valve is energized with the drive amount before it was stopped the last time so that the bias point corresponds to the flow rate after tapping, the flow rate control on-off valve is opened, and tapping is started. The driving amount of the mixing valve is maintained until it reaches a predetermined value to suppress hunting due to turbulence of the flow immediately after tapping.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a hot and cold water mixing control device, and FIG.
The same parts as 0 are assigned the same reference numerals and detailed explanations thereof are omitted. 22 is an urging means, which is an automatic pressure regulating valve 3 and an urging means 2.
2 forms the mixing valve 23. Numeral 24 is a mixing valve drive means that opposes the force of the biasing means 22 and applies a variable bias force to the mixing valve 23. The mixing valve drive means 24 has a first plunger 25 made of a magnetic material and a first coil 26 that is waterproof and insulated around the first plunger 25, and the first coil 26 is a control means. It is connected to 18. The mixed hot water temperature is detected by the mixed hot water temperature detecting means 15.

The flow rate is adjusted downstream of the mixing section 19 by a flow rate adjustment on-off valve 20. The flow rate control on-off valve 20 is provided with a valve body 27, a conical flow rate control valve body 28 for adjusting the flow rate, and a valve seat 29 corresponding thereto in the valve body. The flow control valve element 28 and the primary pressure of the fluid (mixing
In order to achieve a good balance with the pressure), a grooved diaphragm 30 as a flexible pressure receiving body is connected between the flow rate control valve body 28 and the valve housing 27, and the groove 30a is further deepened.
Regardless of the lift amount of the flow control valve element 28, the effective pressure receiving area is always equal to the diameter of the valve seat 29. The back pressure chamber 31, which is completely partitioned from the primary side by the diaphragm 30, and the secondary side of the flow rate control valve body 28 communicate with each other through a communication hole 32. The flow rate control valve body 28 is biased by a spring 34 as a biasing means 33 in a direction in which the flow rate control valve body 28 contacts the valve seat 29. In addition, the second coil 35
Then, there is a pipe 36 whose one end face is sealed, and the second plunger 37 driven by the amount of electricity supplied to the second coil 35 slides in the pipe 36. Second plunger 37
Is configured to interlock with the flow rate control valve body 28 via the shaft 38. The second coil 35, the pipe 36, and the second plunger 37 form the flow rate adjusting on-off valve driving means 21.

In the above structure, the control means 18 regulates the flow rate by controlling the amount of electricity supplied to the second coil 35. To bring the flow rate to 0 (stop), the control means 1
When the flow of current to the second coil 35 is cut off at 8, the flow control valve body 28 urged by the spring 34 comes into contact with the valve seat 29 and the fluid stops flowing. When the second coil 35 is energized, the second plunger 37 is attracted or pushed out, the flow control valve body 28 is lifted against the biasing force of the spring 34, and the fluid (mixed hot water) begins to flow. That is, the control means 18 controls the flow rate by changing the amount of electricity supplied to the second coil 35 to adjust the flow rate control valve body 28 to an arbitrary lift amount.

FIG. 2 shows an example of the control means 18. Reference numeral 39 is a mixing valve control means for inputting signals from the mixing hot water temperature detecting means 15 and the setting means 17 to calculate the drive amount of the mixing valve 23, and 40 is a mixing valve driving means (first control means) according to the signal from the mixing valve control means 39.
First drive amount setting means for setting the drive amount of the coil 26), 41 is a flow rate adjusting on-off valve control means for inputting a signal from the setting means 17 and calculating the drive amount of the flow rate adjusting on-off valve 20, 42
Is the second drive amount setting means for setting the drive amount of the flow rate adjusting on-off valve driving means 21 by the signal of the flow rate adjusting on-off valve control means 41, and 43 is the time when the signal for reducing the flow rate is inputted by the setting means 17. Storage means for storing the value of the mixing valve control means 39, 44 is an opening / closing signal generating means for selecting opening / closing of the flow rate adjusting on-off valve 20, which is usually an open / close switch, and is composed of the mixing valve controlling means 39 and the flow rate adjusting on-off valve control. Means 41
Connected to.

Next, the operation of the configuration of the present invention will be described. When adjusting the temperature, the control means 18 causes the first coil 26 to
When a current is applied to the first plunger 25 made of a magnetic material,
Applies a bias force to the valve shaft 8 according to Fleming's law. When the biasing force and the biasing force of the biasing means 22 are balanced, the automatic pressure regulating valve 3 balances. Therefore,
By changing the current flowing through the first coil 26, the balance point of the automatic pressure regulating valve 3 can be moved. For example, when the current is small, the force of the urging means 22 is stronger, so that the water-side valve body 6 opens more than the water-side valve body 4, and the hot water outlet temperature becomes low. When the current is increased, the plunger 25 is pushed out against the force of the urging means 22 to open the hot-water valve body 4 and consequently the hot-water temperature rises.

In this way, the control means 18 inputs the signal of the mixed hot water temperature detection means 15 and the signal of the setting means 17 so that the hot water discharge temperature becomes the set temperature, and the mixing valve control means 39, the first drive The amount setting means 40 changes the current flowing through the first coil 26 to adjust the mixing valve 23.

When the normal hot water is discharged, the above-mentioned method does not cause any problem, but when the hot water is stopped by the opening / closing signal generating means 44, the flow rate control opening / closing valve 20 is closed and the mixing section 19 is closed. And the balance of the mixing valve 23 collapses. In that case, if the control gain of the mixing valve 23 is the same as the normal (when tapping), the operation of the mixing valve 23 cannot follow the deviation of the pressure balance, and the tapping temperature greatly changes. If the hot water is stopped as it is, the hot water remaining in the vicinity of the mixing portion 19 with a drastic change in temperature will come out when the hot water is discharged next time, which is uncomfortable and dangerous. If the hot water temperature is controlled until it stops, the mixing valve 23
Is moving to a balance point with a minute flow rate, the flow rate suddenly increases when tapping is restarted, the current flowing from the control means 18 to the first coil 26 cannot be rapidly changed, and the temperature is not fixed at a large flow rate. It was dangerous because a large amount of mixed hot water was discharged.

Therefore, the present invention takes the following means in order to prevent the above phenomenon. During normal hot water discharge, the mixing valve control means 39 adjusts the temperature detected by the mixed hot water temperature detection means 15 to a preset temperature (or a temperature set by the setting means 17; hereinafter referred to as set temperature Ts). The drive amount is set and the current flowing through the first coil 26 is adjusted via the first drive amount setting means 40. This will be described with reference to the flowchart of FIG. 3 and the output characteristic diagram of FIG. In the temperature control of step 100 in FIG. 3, first, the difference between the set temperature and the signal of the mixed hot water temperature detection means 15 is obtained, and this is set as the deviation E (step 101). The control amount f (E) is calculated in step 102 using this deviation E. Here, f (E) may be any well-known PID control or fuzzy control, and the type of control law is not fixed. When the stop processing is not performed, the mixing valve control means 39 uses this f (E) to set the first drive amount setting means 40.
To drive the first coil 26 by setting a current flowing through the first coil 26 (step 103). This temperature control is repeatedly performed at a constant sampling cycle.

When the control means 18 inputs a signal for stopping the hot water discharge from the opening / closing signal generating means 44 at the time of stop (time t1 in FIG. 4), the flow rate control opening / closing valve control means 41 passes through the second drive amount setting means 42. Then, the current flowing through the second coil 35 is lowered to close the flow rate control on-off valve 20. At this time, the mixing valve control means 39 also inputs the stop signal of the opening / closing signal generating means 44 and enters the temperature control at the time of stop. This will be described using a flowchart. In FIG. 3, when the stop process is judged by the signal from the opening / closing signal generating means 44 in the temperature control of step 100 (step 104), it is judged whether or not this stop process is the first time. If it is the first time in step 105, the stop amount has not yet been entered, so the drive amount f in this state is f.
(E) is stored in the storage means 43 (M) (step 106)
To do. After that, the temperature deviation in step 107 is obtained, and the control amount f (E) in step 108 is calculated. When performing the stop processing, unlike the normal temperature control, the mixing valve control means 39 multiplies the control amount f (E) by a constant in step 109, and using this, outputs a signal to the first drive amount setting means 40. The current flowing through the coil 26 of No. 1 is set and driving is performed. After stopping the tapping, when a signal to start tapping again is input from the opening / closing signal generating means 44 to the control means 18 (time t2 in FIG. 4), the mixing valve control means 39 determines the start of tapping at step 110 in the temperature control, At the beginning of tapping, the value of the drive amount of the mixing valve drive means 24 is set from the storage means 43 to the drive amount when the flow rate at which the stop process is performed last time is large (step 111). Then, after the driving amount is transmitted to the mixing valve 3, the flow rate control on-off valve 20 is opened (time t3 in FIG. 4). Normally, the control means 18 performs sampling control, so that the start of tapping has already finished at the next sampling time, so normal temperature control may be performed.

As a result, the temperature of the mixed hot water discharged can be kept substantially at the set value Ts until it is stopped (FIG. 4).

If the above processing is not performed, the result is as shown in FIG. When the process is described with reference to the flowchart of FIG. 4, the temperature deviation of step 107 is first obtained when the tapping is stopped, and the control amount f (E) of step 108 is calculated.
When performing the stop processing, unlike the normal temperature control, the mixing valve control means 39 multiplies the control amount f (E) of this step 109 by a constant and uses this to output a signal to the first drive amount setting means 40. The current flowing through the coil 26 of No. 1 is set and driving is performed. Therefore, the drive amount becomes a large value. Here, the drive amount before the stop processing is not stored. After the tapping is stopped, a signal for starting tapping again is input from the opening / closing signal generating means 44 to the control means 18 (time t in FIG. 5).
2) Since the mixing valve control means 39 performs normal temperature control in the temperature control, the flow rate control on-off valve 20 is opened while keeping the drive amount at the time of stop. Since the driving amount of the mixing valve 23 may be much smaller, the temperature of the mixed hot water rises rapidly. The mixing hot water temperature detecting means 15 detects this temperature and the mixing valve control means 39
Reduces the drive amount to match the set temperature. Therefore, the hot water discharge temperature causes large hunting at the start of hot water discharge.

Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the flow chart of FIG. 3 in the above embodiment are designated by the same reference numerals, detailed description will be omitted, and different parts will be mainly described. Immediately after the tapping is started, the flow velocity of the mixing section 19 is slow and the response of the mixing hot water temperature detecting means 15 is blunt. Therefore, hunting may occur if normal temperature control is performed immediately after the value is set from the storage unit 43 (step 111) at the next sampling time. In order to prevent this phenomenon, the drive amount of the mixing valve 23 is fixed to a value before the stop processing for a certain period of time after starting the hot water taking into consideration the response speed of the mixed hot water temperature detecting means 15 (step of FIG. 6). 112, ΔT time in FIG. 7). Then, after a preset time has elapsed (after t4 in FIG. 7), normal temperature control may be performed. As a result, the mixed hot water temperature detecting means 15 becomes stable and then the temperature control is started, so that the hot water discharge temperature does not cause hunting and the safe hot water discharge can be started.

Further, another embodiment of the present invention will be described with reference to FIG. The same parts as those in the flow chart of FIG. 3 in the above embodiment are designated by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described. Immediately after the tapping is started, the temperature of the mixing section 19 may be uneven due to convection or the like. Therefore, if normal temperature control is performed in the next sampling time immediately after setting the value (driving amount) from the storage means 43 (step 111), hunting may occur. In order to prevent this phenomenon, after starting the hot water discharge, the drive amount of the mixing valve 23 is fixed to the value before the stop processing until the signal of the mixed hot water temperature detecting means 15 reaches a predetermined value. For example, in FIG. 9, if the value predetermined by the mixing valve control means 39 is x, the normal temperature control is resumed after the value detected by the mixed hot water temperature detection means 15 reaches this x (after t5). In this embodiment, x is predetermined, but step 113 in FIG.
As described above, the time to return to the normal control may be determined according to the temperature deviation.

As a result, the temperature control of the mixing section 19 is stabilized before the temperature control is started, so that the hot water discharge temperature does not cause hunting and the safe hot water discharge can be started.

[0026]

As described above, according to the hot and cold water mixing control apparatus of the present invention, when the hot water discharge is started, the mixing valve is urged by the drive amount before the previous stop so that the bias point corresponds to the flow rate after the hot water discharge. Since the flow rate control on / off valve is opened after that, it is possible to prevent a large temperature change immediately after the start of hot water discharge, and it is possible to safely supply the temperature of the mixed hot water.

In particular, since the drive amount of the mixing valve is set to the previous value by the signal of the opening / closing signal generating means before the flow rate control on / off valve is opened, it is indirect after the mixed hot water has started to flow using the flow rate switch or the like. As compared with the case where the opening of the flow rate control on-off valve is detected and the previous drive amount is set, the temperature fluctuation can be made much smaller, and safe tapping start can be realized.

Further, at the start of tapping, the mixing valve is urged by the drive amount before it is stopped to reach the bias point corresponding to the flow rate after tapping, and then the flow rate control on-off valve is opened to start constant tapping. Since the driving amount of the time mixing valve is held, the occurrence of hunting can be prevented in advance in consideration of the detection delay of the mixed hot water temperature detecting means immediately after the hot water is discharged, and the safe hot water discharge can be started.

Further, at the start of tapping, the mixing valve is urged by the drive amount before it is stopped to reach the bias point corresponding to the flow rate after tapping, and then the flow rate control on-off valve is opened to start tapping. Since the drive amount of the mixing valve is maintained until the temperature of the section reaches a predetermined value and then the temperature is shifted to the normal temperature control, the mixing section causes convection etc. while the tapping is stopped, and the temperature becomes uniform. It is possible to prevent hunting or the like due to unstable control of the mixing valve in an unstable state such as a rapid change in flow velocity.

Therefore, even if it is used for a shower or the like in which the flow rate is stopped and hot water is frequently discharged, an uncomfortable temperature is not felt, and a safe mixed hot water temperature can be supplied, so that the apparatus can be used with peace of mind. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a hot and cold water mixing control device of the present invention.

FIG. 2 is a control block diagram of the hot water mixing controller.

FIG. 3 is a flowchart of the control block.

FIG. 4 is an output characteristic diagram at the time of tapping of the present invention.

[Fig. 5] Output characteristic diagram during conventional hot water discharge

FIG. 6 is a flowchart of a control block of the second embodiment of the device of the present invention.

FIG. 7 is an output characteristic diagram at the time of tapping of the second embodiment of the device of the present invention.

FIG. 8 is a flowchart of a control block of the third embodiment of the device of the present invention.

FIG. 9 is an output characteristic diagram of the third embodiment of the device of the present invention when tapping hot water.

FIG. 10 is a sectional view of a conventional hot and cold water mixing control device.

[Explanation of symbols]

1 hot water flow path 2 water channels 3 Automatic pressure regulating valve (mixing valve) 15 Mixed hot water temperature detection means 17 Setting means 18 Control means 19 mixing section 20 Flow control on-off valve 21 Flow control on-off valve drive means 24 Mixing valve drive means 44 Opening / closing signal generating means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuo Kidouchi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (3)

[Claims] 1. A hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, a mixing valve drive means for driving the mixing valve, a flow rate adjusting on-off valve, and the flow rate. Flow rate control on-off valve drive means for driving the control on-off valve, on-off signal generation means for selecting the opening and closing of the flow rate control on-off valve, drive signals are output to the mixing valve drive means and the flow rate control on-off valve drive means, respectively. And a storage means for storing a drive signal of the mixing valve driving means when the hot water discharge stop signal is input from the open / close signal generating means, and a storage means when the hot water start signal is input from the open / close signal generating means. A hot and cold water mixing controller having a mixing valve control means for outputting a driving signal of the means to the mixing valve driving means. 2. A hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, a mixing valve drive means for driving the mixing valve, a flow rate adjusting on-off valve, and the flow rate. Flow rate control on-off valve drive means for driving the control on-off valve, on-off signal generation means for selecting the opening and closing of the flow rate control on-off valve, drive signals are output to the mixing valve drive means and the flow rate control on-off valve drive means, respectively. The control means comprises a storage means for storing a drive signal of the mixing valve driving means at the time of inputting a hot water stop signal from the opening / closing signal generating means, and the storage means at the time of inputting a hot water start signal from the opening / closing signal generating means. A hot and cold water mixing control device having a mixing valve control means for outputting the driving signal of the above to the mixing valve drive means for a certain period of time. 3. A hot water flow path and a water flow path, a mixing valve for adjusting the flow rates of the hot water flow path and the water flow path, a mixing valve drive means for driving the mixing valve, a flow rate control on-off valve, and the flow rate. Flow rate control on-off valve drive means for driving the control on-off valve, on-off signal generation means for selecting the opening and closing of the flow rate control on-off valve, drive signals are output to the mixing valve drive means and the flow rate control on-off valve drive means, respectively. The control means comprises a storage means for storing a drive signal of the mixing valve driving means when the hot water stop signal is input from the opening / closing signal generating means, and a hot water mixing temperature when the hot water start signal is input from the open / close signal generating means. A hot and cold water mixing control device having mixing valve control means for outputting the drive signal of the storage means to the mixing valve drive means until the temperature signal of the detection means reaches a predetermined value.