JP2661271B2 - 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 and cold water mixing control device for adjusting a mixing ratio of hot water and water to obtain an optimum mixed hot water temperature.

2. Description of the Related Art Conventionally, this type of hot and cold water mixing apparatus is as shown in FIG.

In FIG. 5, 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, Side valve seat 7, hot water side valve body 4 and water side valve body 6
And the primary pressure PH1, PC1 after decompression of hot water and water
And the piston 9 that operates with a pressure difference of 2. When the pressure of hot water or water changes suddenly, the automatic pressure regulating valve 3 moves at that pressure, and the secondary pressure PH2 of hot water and water is always equal to PC2. Acts to be kept. The mixing ratio of hot water and water is varied by moving the mixing valve 12 energized by the motor 11 left and right to change the mixing temperature. Reference numeral 13 denotes a mixing portion of hot water and water. After mixing, hot water is discharged through a flow rate control opening / closing valve 14, and its temperature is detected by a mixed hot water temperature detecting means (for example, a thermistor) 15, and its flow rate is detected by a flow rate detecting means 16. The control means 18 energizes the motor 11 and the flow control on-off valve 14 so as to match the value of the setting means 17.

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.

An object of the present invention is to solve such a conventional problem, and it is an object of the present invention to drive a mixing valve until the temperature in the valve becomes equal to or lower than a predetermined value even after stopping hot water to prevent scale adhesion and prevent sticking of the valve. I do.

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,
The apparatus is provided with a mixed hot water temperature detecting means and a control means for outputting a signal for driving the mixing valve until the signal of the mixed detecting means reaches a predetermined value after the hot water is stopped.

Operation According to the above configuration, after detecting the closing of the flow rate adjusting on-off valve, the mixing valve is driven until the signal of the mixing hot water temperature detecting means reaches a predetermined value, thereby preventing scale adhesion.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a hot and cold water mixing apparatus, and the same parts as those in FIG. 5 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
Reference numeral 27 denotes first drive amount setting means, and reference numeral 28 denotes 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 mixing valve 20 so that the temperature of the mixed hot water reaches 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.

Then, when the main control means 26 detects that the flow control on-off valve 14 has been closed and the tapping has stopped (point a in FIG. 3) based on the signal of the close detection means 25, the signal of the mixed hot water temperature detection means 15 is preset. A signal is sent to the first drive amount setting means 27 to drive the mixing valve 20 so as to move the mixing valve 20 until the value becomes equal to or less than the preset value (40 ° C. in FIG. 3). (A flowchart is shown in FIG. 4.) 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 27 at this time. The coil current is periodically changed from min when the mixing valve 20 is fully opened to max when the mixing valve 20 is fully opened.

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, the mixing valve 20 is continuously operated until the signal of the mixed hot water temperature detecting means 15 reaches a preset value. Also, the mixing valve is operated only twice immediately after the stop of hot water supply and when the signal of the mixed hot water temperature detecting means 15 reaches a preset value. Further, operating the mixing valve only once when the signal of the mixed hot water temperature detecting means 15 reaches a preset value is effective for preventing scale adhesion and sticking of the valve.

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 rate control opening / closing valve for adjusting the amount of mixed hot water, a mixed hot water temperature detecting means, and a control for outputting a signal for driving the mixed valve until the signal of the mixed hot water temperature detecting means becomes a constant value after stopping the tapping. Since the means is provided, the mixing valve can be driven until the temperature inside the valve becomes equal to or less than a predetermined value even after the stop of tapping. For this reason, even after the stoppage of tapping, scale can be prevented from adhering to the mixing valve even in a high-temperature, non-flow rate valve, and the mixing valve can be prevented from sticking, and a stable mixed-water temperature can be supplied.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hot water mixing control apparatus according to one embodiment of the present invention, FIG. 2 is a control block diagram of the same apparatus, FIG. 3 is a characteristic diagram of mixed hot water temperature of the same apparatus, and FIG. FIG. 5 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, 18 ... control means, 20 ... mixing valve, 25 ... closing detection means.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukio Nagaoka 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-house (56) References Japanese Utility Model Showa Sho 62-117366 (JP, U)

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. A hot and cold water mixing control device comprising an on-off valve, a mixed hot water temperature detecting means, and a control means for outputting a signal for driving the mixing valve until the signal of the mixed hot water temperature detecting means reaches a predetermined value after stopping the tapping. .