JP2661278B2 - Hot water mixing control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water mixing control device that obtains an optimum mixed hot water temperature by adjusting a mixing ratio of hot water and water.

2. Description of the Related Art Conventionally, this type of hot water mixing apparatus has been as shown in FIG.

In FIG. 7, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in connection with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 and a hot water side valve seat 5 for reducing the primary pressure PH1 of the hot water flow path 1, a water side valve body 6 for reducing the primary pressure PC1 of the water flow path 2, and a water side. It comprises a valve seat 7, a valve shaft 8 connecting the hot water side valve body 4 and the water side valve body 6, and a piston 9 which operates with a pressure difference between the primary pressure PH <b> 1 and the PC <b> 1 after decompression of hot water and water. Thus, even if the pressure of hot water or water changes suddenly, the automatic pressure regulating valve 3 moves at that pressure, and acts so that the secondary pressure PH2 of the hot water and water and PC2 are always kept equal. The mixing ratio of hot water and water is varied by moving the mixing valve energized by the motor 11 left and right to change the mixing temperature. Reference numeral 13 denotes a mixing section of hot water and water. After mixing, the hot water is discharged through a flow rate control opening / closing valve 14. Is controlled by the motor 11 and the flow control on / off valve so as to match the value of the setting means 17.
Energize 14.

SUMMARY OF THE INVENTION However, in the above-described configuration, a substance (calcium, chlorine, etc .; hereinafter referred to as scale) contained in the water in the valve when the valve is not used for a long period of time is mixed valve.
It may precipitate on the surface such as 12 and stick the valve.

The present invention solves such a conventional problem, and drives the mixing valve until a predetermined time elapses so that the temperature inside the valve becomes equal to or lower than a certain temperature even after the tapping is stopped, thereby preventing scale adhesion and preventing sticking of the valve. The purpose is to:

Further, the second object is that, when the mixing valve is driven at the time of stoppage of tapping as described above, a request for re-starting tapping,
To start tapping when the mixing valve is in a position where the tapping temperature is safe.

Means for Solving the Problems In order to solve the above problems, the hot and cold water mixing device of the present invention is
A hot water flow path and a water flow path, a mixing valve that adjusts the flow rate of the hot water flow path and the water flow path, a mixing valve driving unit that drives the mixing valve, and a flow rate adjustment on-off valve that adjusts a mixed hot water amount,
Setting means for setting the temperature of the mixed hot water, first control means for outputting a signal for driving the mixing valve for a certain period of time after stopping the tapping, and setting the mixing valve at a position for supplying the mixed hot water having a temperature equal to or lower than a set temperature. Then, a second control means for performing an opening operation of the flow control on-off valve is provided.

Operation With the above configuration, after the tapping is stopped, the mixing valve is driven until a certain time elapses to prevent the scale from adhering, and when the mixing valve is driven after the tapping is stopped, the tapping is required again. Then, when the mixing valve comes to a safe position where the degree of hot water falls below the set temperature, the flow control on-off valve is opened.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the hot and cold water mixing apparatus, and the same parts as those in FIG. 7 are denoted by the same reference numerals.

19 is a biasing means, and is a mixing valve formed by the automatic pressure regulating valve 3 and the biasing means 19.
Form 20. Numeral 21 is a mixing valve driving means for applying a variable bias force in opposition to the force of the urging means 19. The mixing valve driving means 21 has a plunger 22 made of a magnetic material, and a coil 23 which is waterproof and insulated around the plunger 22. The coil 23 is connected to the control means 18. The flow control on-off valve 14 is driven by a flow control on-off valve driving unit 24, and the flow rate is detected by the flow detection unit 16. Flow control on-off valve
The closure of 14 is detected by the closure detection means 25.

FIG. 2 shows an example of the control means 18. 26 is the main control means
27 is a first control means, 28 is a first drive amount setting means,
29 is second control means, and 30 is second drive amount setting means.

 Next, the operation of the configuration of the present invention will be described.

When a current flows from the control means 18 to the coil 23, the plunger 22 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 urging force of the urging means 19 are balanced, the automatic pressure regulating valve balances.

Therefore, the balance point of the automatic pressure regulating valve 3 can be moved by changing the current flowing through the coil 23.

For example, when the current is small, the force of the urging means 19 is stronger, so that the water-side valve body 6 opens more than the hot-water-side valve body 4, and the tapping temperature decreases.

When the current is increased, the plunger 22 is pushed out against the force of the urging means 19, so that the hot-water-side valve body 4 opens, and as a result, the hot-water tapping temperature increases.

In this way, the control means 18 inputs the signal of the mixed hot water temperature detecting means 15 and the signal of the setting means 17 to adjust the current flowing through the coil 23 so that the tap water temperature becomes the set temperature.

However, scale may adhere to the mixing valve 20, and the valve may stick. The means for suppressing these phenomena will be described below.

The adhesion of the scale varies greatly depending on the temperature of the hot water, and at 80 ° C., it is deposited several tens of times at 40 ° C. Also, the lower the flow rate, the easier the adhesion. For this reason, scale adhesion to the mixing valve 20 is likely to occur during the tapping and after the tapping is stopped until the temperature of the mixing unit 13 is completely cooled.

However, during tapping, since the main control means 26 adjusts the coil current to move the mixed hot water temperature to the set temperature and moves the mixing valve 20, the scale does not easily adhere.

Therefore, after the hot water is stopped, the high-temperature mixed hot water stays in the mixing section, so that there is a possibility that the scale adhesion is most promoted.

The main control means 26 sends a signal to the timer means 31 when it detects that the flow control on-off valve 14 has closed and the tapping has stopped (point a in FIG. 3) based on a signal from the close detection means 25. Then, a signal is sent to the first control means 27 to move the mixing valve 20, and the first control means 27 starts to send a signal to the first drive amount setting means 28 based on this signal to drive the mixing valve 20.
The timer means 31 starts to measure time by a signal from the main control means 26.

Tapping after stopping a temperature in the valve will come steadily down since the high-temperature hot water is not supplied. The time during which the temperature in the valve falls to the temperature without the deposition of scale is set in the main control means 26 in advance. When the time measured by the timer means 29 reaches the time previously set in the main control means 26 (point b in FIG. 3), the main control means 26 sends a signal to the first control means 27 to drive the mixing valve 20. Stop.

FIG. 3 shows a change in coil current as an example of the operation of the mixing valve 20 by the first drive amount setting means 28 at this time. For a certain period of time after the stoppage of tapping (T in FIG. 3), the current value during tapping is held in case of tapping again immediately. Thereafter, the coil current is changed from the minimum value at which the mixing valve 20 is fully opened to the maximum value at which the hot water is fully opened.
Change to ax regularly.

The movement of the mixing valve 20 makes it difficult for the scale to adhere to the mixing valve 20. Furthermore, if the scale is a mixing valve
Since the mixing valve 20 itself is periodically driven even if it adheres to the scale 20, the scale can be removed before the valve is fixed.

In the example of FIG. 3, the mixing valve 20 is operated intermittently.
In addition to this, the mixing valve 20 is continuously operated until the signal of the mixed hot water temperature detecting means 15 reaches a preset value. The mixing valve is operated only twice when the value reaches the preset value, and the mixing valve is operated only once when the signal of the mixed hot water temperature detecting means 15 reaches a preset value. It is effective for preventing scale adhesion and sticking of valves.

Next, a case will be described in which a request for re-watering is made while the mixing valve 20 is operating while the above-mentioned hot water is stopped.

When the tapping is requested by the setting means 17 or the like after the tapping is stopped, when the mixing valve 20 is driven to prevent scale adhesion as described above, the flow control on-off valve 14
There is a danger that the mixed hot water that greatly deviates from the set temperature will flow out when the is opened. Therefore, the main control means monitors the signal of the first control means, and when there is a re-watering request, the flow control on-off valve
Adjust the opening timing of 14.

In the following description, it is assumed that the set temperature is not changed by the setting means 17 or the like during the stop of hot water supply, and is the set temperature at the time of the previous stop for easy understanding.

First, when the position of the mixing valve is at the position for supplying the set temperature or at a temperature lower than that at the time of the re-watering request (point c in FIG. 4 or point d in FIG. 5), the main control means sets the second control to the second position. The second control means 29 starts to send a signal to the second drive amount setting means 28 based on this signal, and opens the flow control on-off valve 14. At this time, the tapping temperature is lower than the set temperature, which is safe.

When the position of the mixing valve is higher than the set temperature at the time of the re-watering request (point e in FIG. 6), the main control means monitors the signal of the first control means 27, so that mixing is performed. valve
When the first control means 27 outputs a signal at which the drive current 20 can supply the set temperature (point f in FIG. 6), a signal is output to the second control means 29, and the second control means 29 starts to send a signal to the second drive amount setting means 28 in response to this signal, and opens the flow control on-off valve 14. By performing this process, the tap water temperature does not become higher than the set temperature, and a safe hot water temperature can be supplied.

After tapping, the main control means 26 directly operates the first drive amount setting means.
In addition to adjusting the mixing temperature by sending a signal to the coil 28 and controlling the coil current, a signal is also sent directly to the second drive amount setting means 30 to adjust the tap water flow rate.

In a normal use state, when the water pressure fluctuates, the automatic pressure regulating valve 3 operates as in the conventional case, and if the pressure receiving areas of the hot water side valve element 4, the water side valve element 6, and the piston 9 are made equal, the secondary pressure PH
2 and PC2 maintain the state at the balance point by the urging means 19 and the driving means 21.

Further, since the pressure regulating valve and the temperature regulating valve can be integrated into one, the size can be reduced.

Effect of the Invention As described above, the hot and cold water mixing control device of the present invention provides a hot water flow path and a water flow path, a mixing valve that adjusts the flow rates of the hot water flow path and the water flow path, and a mixing valve driving unit that drives the mixing valve. When,
A flow control on / off valve for adjusting the amount of mixed hot water, setting means for setting the temperature of the mixed hot water, first control means for outputting a signal for driving the mixing valve for a certain period of time after stopping the tapping, and the mixing valve Is provided with a second control means for opening the flow rate control on-off valve after setting to a position for supplying mixed hot water having a temperature equal to or lower than a set temperature. It becomes possible to drive it. For this reason, it is possible to prevent the scale from adhering to the mixing valve even in the high-temperature valve having no flow velocity after stopping the tapping, and to prevent the mixing valve from sticking and to supply a stable mixed-water temperature.

In addition, if there is a re-watering request when the mixing valve is driven to prevent scale adhesion after stopping the tapping, the tapping temperature is set by opening the flow control on-off valve after the position of the mixing valve has fallen below the set temperature. The temperature does not become higher than the temperature, and a safe hot water temperature can be supplied.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hot and cold water mixing control device according to one embodiment of the present invention, FIG. 2 is a control block diagram of the device, FIG.
FIG. 5, FIG. 5 and FIG. 6 are characteristic diagrams of the mixed hot water temperature of the apparatus, and FIG.
FIG. 1 is a sectional view of a conventional hot and cold water mixing control device. 1 hot water flow path, 2 water flow path, 15 mixed hot water temperature detecting means, 17 setting means, 18 control means, 20 mixing valve,
25 ... Closed detection means.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukio Nagaoka 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In company

Claims (1)

(57) [Claims] 1. A hot water flow path and a water flow path, a mixing valve for adjusting flow rates of the hot water flow path and the water flow path, a mixing valve driving means for driving the mixing valve, and a flow rate adjusting means for adjusting a mixed hot water amount. Opening / closing valve, setting means for setting the temperature of the mixed hot water, first control means for outputting a signal for driving the mixing valve for a certain period of time after stopping the hot water supply, and supplying the mixed hot water at which the mixing valve is at or below the set temperature. And a second control means for performing an opening operation of the flow rate control on-off valve after setting to a position at which the flow rate is adjusted.