JPH0799220B2 - Hot water mixing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing apparatus for hot water supply that adjusts a mixing ratio of hot water and water to obtain an appropriate temperature.

2. Description of the Related Art A conventional hot and cold water mixing apparatus of this type is shown in FIG. (For example, Japanese Utility Model Laid-Open No. 61-18424) In FIG. 5, the water supply system 1 is divided into two systems, and the hot water supply pipe line 3 and the water supply pipe line 4 passing through the water heater 2 are connected to the constant temperature hot water supply device 5. . Inside the constant temperature hot water supply device 5, a hot water amount valve 6 is maintained in the hot water supply pipe 3 and a water amount valve 7 is maintained in the water supply pipe line to adjust the mixing ratio. The mixing conduit 8 is provided with a thermistor 9 for detecting the temperature of the mixed hot water. Based on a signal from the thermistor 9 and a signal from a controller 10 which arbitrarily adjusts the temperature of the mixed hot water, a controller 11 controls the hot water amount valve 6 and The water quantity valve 7 is controlled. The mixed hot water is supplied to a bathtub 13 which is a hot water supply target through a faucet 12 provided at a terminal of the hot water joining pipe 8. The hot water amount valve 6 and the water amount valve 7 are driven by the hot water amount valve motor 14 and the water amount valve motor 15 which are controlled by the control device 11, but the hot water amount valve 6 and the water amount valve 7 have no means for detecting the valve position. . Then, in order to obtain the set temperature of the controller 10, the signal of the thermistor 9 is used to control the hot water valve motor via the controller 11.
15 and the water valve motor 15 are controlled.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) If the temperature of the mixed hot water does not reach the temperature set by the controller 10 even after the hot water flow valve 6 and the hot water flow valve 7 have passed the fully open or fully closed points, there is no valve position detection means.
Hot water side valve 6 and water side valve 7, hot water side motor 14 and water side motor 15
An excessive load was applied to the valve, causing damage to the valve and burnout of the motor.

(2) When the temperature of the hot water supplied from the water heater 2 is low or the hydraulic pressure is low, the hot water amount valve 6 is opened and the water amount valve 7 is closed to obtain the set temperature. Since there is no means for detecting the flow rate, for example, the hot water amount valve 6 reaches a so-called low valve sensitivity region in which the change in the flow rate with respect to the displacement amount is small, and the hot water supply temperature or the hot water pressure rises. In this case, the control operation for returning to the set temperature was delayed, and the temperature of the mixed hot water temporarily increased greatly, which was dangerous. The present invention solves such a conventional problem and does not apply an excessive load to the valve itself or the driving means when the valve is fully opened or fully closed, and suppresses transient temperature fluctuations to a low degree of safety. It is an object of the present invention to provide a hot and cold water mixing device with excellent comfort.

Means for Solving Problems The hot and cold water mixing apparatus of the present invention in order to solve the above problems,
A hot water side valve driven by an electric hot water side drive means, a water side valve similarly driven by the water side drive means, and a hot water side valve position detection means for detecting the valve position continuously or in multiple stages. , Water side valve position detection means, mixed hot water temperature setting device for setting the mixed hot water temperature, and controls the hot water driving means and the water side driving means according to the settings of the mixed hot water temperature setting device to adjust the mixed hot water temperature At the same time, it is configured to include a controller for correcting the manufacturing variation of the hot water valve and the hot water valve by using the signals of the hot water valve position detection means and the hot water valve position detection means, and controlling the valve opening points to be uniform. is there.

With the above-described structure, the present invention controls the hot water side driving means and the water side driving means according to the setting of the mixed hot water temperature setting device to adjust the mixed hot water temperature, and at the same time, the hot water side valve position detecting means and the water side valve position. Using the signal from the detection means, the manufacturing variations of the hot and cold side valves are corrected to control the valve opening points to be the same. And the control using the signal of the hot water valve position detection means and the water side valve position detection means valve prevents an excessive load on the valve itself and the driving means at the time of fully opening or fully closing. It is a thing.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. Hot water and water supplied through the hot water supply pipe 16 and the water supply pipe 17 enter the valve frame body 18 and a pressure balance valve 19 for equalizing the pressure of the hot water and the hot water valve 20 and the water valve 21. Leading to. Hot water valve 20
The water side valve 21 is driven via reduction gears 26 and 27 by a water side motor 24 and a water side motor 25 which are electric driving means provided outside via shafts 22 and 23. The valve position of the hot water valve 20 is detected by the hot water valve position detecting means 28, and the valve position of the water side valve 21 is detected by the hot water valve position detecting means 29. The temperature of the mixed hot water is detected by the thermistor 30, and the mixed flow rate is detected by the flow rate sensor 31.
It is supplied from 32 to the hot water supply target. A setting device 33 is used to instruct start and stop of hot water supply and to set the mixed hot water temperature and flow rate. The switch 34 is a switch for supplying hot water according to a preset mixed hot water temperature, a mixed flow rate, and an integrated value of the mixed flow rate. The switch 35 indicates the mixed flow rate "large" and "small", the switch 36 indicates the decrease of the mixed hot water temperature, and the switch 37 indicates the increase of the mixed hot water temperature. The switch 39 stops the hot water supply. A display unit 40 displays the temperature of the mixed hot water detected by the thermistor 30 and the mixed flow rate detected by the flow rate sensor 31. Signals from the thermistor 30, the flow rate sensor 31, and the setting device 33 are transmitted to the controller 41, and the controller 41 controls the hot water side motor 24, the water side motor 25, and the display unit 40 of the setting device 33. Both the hot water valve 20 and the cold water valve 21 are constructed as shown in FIG. A fixed valve body 42 to which a ceramic disc having an opening is fixed and a valve operating body 44 driven by a fitting portion 43 at the ends of the shafts 22 and 23 form a main part of the valve.
The configurations of the hot water valve position detecting means 28 and the water side valve position detecting means 29 are shown in FIGS. Gears 45 on shaft 22 (23)
The gear 45 is rotated by the rotation of the shaft 22 (23), and the rotation is transmitted to the gear 46, which rotates the potentiometer 47 for continuously detecting the valve position. The gears 45 and 46 have different numbers of teeth, and the rotation angle of the shaft 22 (23) is enlarged and transmitted to the potentiometer 47.
There are dimensional manufacturing variations in the hot water valve 20 and the hot water valve 21. Further, the potentiometer 47 also has manufacturing variations.
Particularly in the case of the hot and cold water mixing apparatus of the present invention using the hot water valve 20 and the hot water valve 21, the timing of opening the hot water valve 20 and the hot water valve 21 is important. That is, the hot water side valve 20 and the water side valve 21 are designed as a fully closed point of the valve, from the point where the fixed valve body 42 and the valve body 44 mutually close the opening, to the position where the fixed valve body 42 and the valve side valve 21 rotate in anticipation of a certain sealing margin. However, the dimensional error between the fixed valve element 22 and the valve operating element 44, the valve operating element 44
The valve position detected as a seal margin is different due to rattling of the fitting portion 43, manufacturing variation of the potentiometer 47, and the like. For this reason, even if the hot water valve 20 and the hot water valve 21 are driven at a constant speed at the time of opening, the hot water is transiently supplied from the hot water or the water depending on the size of the sealing margin. Hot water temperature fluctuates. In order to make the transitional hot water and water mixture ratio proper after opening, the hot water motor 24 and the water motor 25
Even if the driving speed of is controlled with a certain relation, the mixed hot water temperature fluctuates greatly due to the influence of the sealing margin. In order to prevent this, in this embodiment, the fixed valve body 42 and the valve
From the point that 44 mutually block the openings and the flow rate becomes zero, a predetermined angle is adjusted after assembly to set the valve full closing point, and the sealing margins of the hot water valve 20 and the water valve 21 are aligned. Specifically, it is performed as shown in FIG. It is assumed that the characteristics of the potentiometer 47 on the hot water side and the water side are different as shown in the figure.

Points A and A'are the fully closed points of the valve with the sealing margin, B and B'are the fully opened points of the valve, and C and C'are the points where the flow rate becomes zero. At the time of adjustment, the points C and C'are determined by using the flow rate sensor 31 or other measuring means, or by visual inspection, and the position rotated by a predetermined angle from the points C and C'is
Set each as a valve full closing point that allows for sealing,
Mark points A and A '. The resistance values of the potentiometer 47 corresponding to points A and A'are set in the controller 41 as RA and RA '.

Further, the fully open points B and B'of the valve are set within a certain range of the valve sensitivity by using the flow rate sensor 31 or other measuring means, and the resistance value of the corresponding potentiometer 47 is set to RB, It is set in the controller 41 as RB '. As a result, in the hot water valve 20, the resistance value of the hot water valve position detecting means 28 changes from RA to RB.
In the range of, the resistance value of the water side valve 21 is
Operates in the range RA 'to RB', and the hot water valve
The sealing margins of 20 and the water side valve 21 are adjusted to be the same.

Next, the operation of this embodiment will be described. First, while the hot water supply is stopped, the hot water valve 20 and the hot water valve 21 are both closed, the valve body 44 faces the fixed valve body 42 and the position where the opening is closed, and the hot water valve position detection means 29 Resistance value RA and water side valve position detection means 29
RA 'is shown. When the switch 34 is pressed to supply hot water, the hot water valve 20 and the hot water valve 21 are opened. At the time of opening, the hot water valve 20 changes from the resistance value RA of the hot water valve position detecting means 28 to RC.
And the water side valve 21 is driven at a constant speed by the seal margin from the resistance values RA 'to RC' of the water side valve position detecting means 29. After the hot water and the water start to flow, the hot water and the water are driven at a speed that maintains a constant mixing ratio until reaching the set flow rate. Therefore, the opening timings of the hot water side valve 20 and the hot water side valve 21 do not shift, and the mixed hot water temperature does not fluctuate significantly during the opening operation. For the mixed hot water temperature, the signal of the thermistor 30 is compared with the set value corresponding to the switch 34 of the setter 33,
The controller 41 controls the mixing ratio of the hot water valve 20 and the hot water valve 21. The mixed flow rate is compared with the value of the flow rate sensor 31 and the set value corresponding to the switch 34, and the flow rate is adjusted by the hot water valve 20 and the water valve 21. At the same time when the switch 34 is pressed, the signals of the flow rate sensor 31 are integrated by the controller 41, and when the set value corresponding to the switch 34 is reached, hot water supply is automatically stopped. This is used when pouring hot water into the bathtub. If it is desired to stop while the flow rate is being integrated, pressing the switch 39 will stop hot water supply. When a large amount of hot water is supplied when the hot water pressure is low or the hot water temperature is low during hot water supply, the hot water valve 20 is fully opened, but in this case, the fully open point is the fully open point of the hot water valve position detection means 28. Detected by RB, the valve opening is restricted by the controller 41 so that it does not enter the region of pure sensitivity. Even when the water pressure is low or the set value of the mixed hot water temperature is low, it is similarly detected at the fully open point RB 'of the water side valve position detecting means 29, and the valve opening degree is limited. Therefore, the temperature of the mixed hot water does not fluctuate significantly due to changes in the supplied hot water temperature, oil pressure, water pressure, and the like. In addition, since the drive is limited at the fully open and fully closed points of the valve, excessive force may be applied to the hot water valve 20 and the water valve 21, or the hot water motor 24 and the hot water motor 25 may be overloaded. There is no.
In the present embodiment, the hot water valve position detecting means 28 and the water side position detecting means 29 use the potentiometer 47 which detects the valve position steplessly, but it is an increment type which detects the valve position in multiple steps. A rotary encoder or the like may be used. Further, the signal of the potentiometer 47 uses the resistance corresponding to the valve full opening point and the valve full closing point, but C, where the flow rate becomes zero,
A control method in which the point C ′ is also used or another arbitrary point is used is also conceivable. For example, at the start of hot water supply, the hot water valve 20 and the hot water valve
Driving 21 at different speeds from the beginning, waiting for the person who reaches C and C'points earlier, and driving both at a driving speed such that the mixing ratio becomes appropriate when the other arrives is there. Also, by basically using points C and C'as signals, stepping motors are used for the valve sealing margin 24 and the water side motor 25, and a predetermined pulse corresponding to the sealing margin is sent to fully close the valve. There is a method in which the signals at the points A and A'are not used, or are used as the final stopping means only when the pulse count of the step motor fails. Further, only RC and RC 'points are detected, the sealing margin is left as the manufacturing variation, and the variation in the sealing margin of the hot water side valve 20 and the water side valve 21 is measured at the time of adjustment and registered in the controller 41. At the start of hot water supply, the hot water motor 24 and the hot water motor are driven at a drive speed that is inversely proportional to the sealing margin of both sides.
There is also a method of driving 25 so that the timing of arriving at points C and C ′ at which hot water and water start to flow is aligned. Further, when the hydraulic pressure, water pressure, hot water temperature, and water temperature are constant, the valve position at which an appropriate temperature is obtained is determined, and the hot water valve 20 is detected by using the hot water valve position detecting means 28 and the hot water valve position detecting means 29. There is a method of controlling the position with the water side valve 21 to quickly start hot water supply and finely adjusting the temperature of the mixed hot water using the signal of the thermistor 30.

As an effect of the present embodiment, in the hot water valve position detection means 28 and the water side valve position detection means 29, the manufacturing variation of the potentiometer 47 of the hot water valve 20 and the water side valve 21 and both detection means 28, 29. Since it can be absorbed, the first effect is to prevent hot water or water from coming out first at the start of hot water supply and largely changing the mixed hot water temperature. Further, since the hot water valve 20 and the water valve 21 have a water stop function, they can have the functions of both the mixing valve and the water stop valve, and the structure can be simplified. Further, the hot water valve position detecting means 28 and the hot water valve position detecting means 29 are
And the fully closed positions A, A'for the sealing margin of the water side valve 21
Since the points are detected, the sealing margin can be reliably ensured, and the hot water side motor 24 and the water side motor can be prevented from over-rotating.

In this embodiment, the control method of feeding back the signal of the thermistor 30 is taken as an example, but the so-called feedforward control is performed, in which the hot water temperature, the hot water amount, the water temperature, and the water amount are measured, and the mixed hot water temperature is calculated and obtained. Also, the idea of the present invention can be applied.

Effects of the Invention As described above, the hot water mixing device of the present invention has the following effects.

(1) By using the signals of the hot water valve position detecting means and the hot water valve position detecting means, the manufacturing variations of the hot water valve and the hot water valve are corrected to control the opening points of the hot water to make the hot water side and the hot water It has an independent valve on the side and is unique to an electrically controlled hot and cold water mixing valve.
It is possible to prevent large temperature fluctuations caused by manufacturing variations of the hot water valve and the hot water valve at the start of hot water supply, and ensure safety and comfort.

(2) The valve itself is used when the valve is fully opened or fully closed by using the signals of the hot water valve position detection means and the water valve position detection means provided for correcting manufacturing variations of the hot water valve and the hot water valve. It is possible to prevent an excessive load on the drive means.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a hot and cold water mixing apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a hot water side valve and a water side valve of the apparatus, and FIG. Top view of the hot water side valve position detecting means and the water side valve position detecting means, FIG. 3 (b) is the same plan view, FIG. 4 is a characteristic view of the same detecting means, and FIG. 5 is a conventional hot water mixing apparatus. It is a block diagram shown. 20 …… Hot water side valve, 21 …… Water side valve, 24 …… Hot water side motor (hot water side driving means), 25 …… Water side motor (water side driving means), 28…
… Water side valve position detecting means, 29 …… Water side valve position detecting means, 33
...... Setting device (mixed hot water temperature setting device), 41 …… Control device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 60-249783 (JP, A) JP 61-109987 (JP, A) JP 60-201173 (JP, A) JP 61- 153423 (JP, A) JP 57-59211 (JP, A) JP 58-129511 (JP, A) Actually opened 61-1076 (JP, U) Actually opened 61-18424 (JP, U)

Claims (2)

[Claims] 1. A hot water valve for adjusting the flow rate of hot water, hot water drive means for electrically driving the hot water valve, and valve positions of the hot water valve are detected continuously or in multiple steps. Hot water side valve position detecting means, a water side valve for adjusting the flow rate of water, a water side driving means for electrically driving the water side valve, and a valve position of the water side valve continuously or in a multiple manner. Water side valve position detection means for detecting in stages, mixed hot water temperature setting device for setting the mixed hot water temperature, and mixing by controlling the hot water side driving means and the water side driving means according to the setting of the mixed hot water temperature setting device. While adjusting the hot water temperature,
Mixing hot and cold water using a controller for correcting manufacturing variations of the hot water valve and the hot water valve by using signals from the hot water valve position detecting means and the hot water valve position detecting means to control the valve opening points to be uniform. apparatus. 2. The controller sets a valve closing point at a position that allows for the sealing margin of the water side valve of the water side valve, using the signals of the water side valve position detecting means and the water side valve position detecting means. The hot and cold water mixing apparatus according to claim 1.