JP2890896B2 - Hot water mixing equipment - Google Patents

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 apparatus which mixes hot and cold water to obtain an appropriate temperature and has means for detecting water cutoff.

[0002]

2. Description of the Related Art Conventionally, this kind of hot water mixing apparatus has been as shown in FIG. In FIG. 4, inside a valve housing 4 having a hot water inlet 1, a water inlet 2 and a mixed hot water outlet 3, a hot water side valve element 5 and a water side valve element 6 are attached to a shaft 7, and are provided outside. It is driven by a motor 10 via a linear motion conversion mechanism 8 and a gear 9 provided. A mixed hot water temperature detector 11 for detecting the temperature of the mixed hot water is provided in the vicinity of the outlet 3 of the mixed hot water.
The controller 13 compares the temperature detected in step 1 with the controller 13 and controls the motor 10. Further, a faucet 15 is provided at the terminal via the pipe 14. Then, when the faucet 15 is opened and the mixed hot water temperature is set by the mixed hot water setting device 12, the controller 13 sets the value of the mixed hot water detector 11 and the set value of the mixed hot water temperature as signal values to eliminate the temperature deviation between the two. The drive of the motor 10 is controlled as described above. (For example, Japanese Utility Model Laid-Open No. 55-59223)

[0003]

However, if both the hot water and the water are cut off during the temperature control in the tapping state with the above configuration, the temperature detector 11 detects the ambient temperature in the valve housing 4 and detects the temperature. Gradually decreases. Controller 1
Numeral 3 increases the valve opening of the hot water side valve body 5. Here, when the interruption of the water supply is restored, a large amount of hot water flows in, causing an unsafe situation in which high-temperature hot water is unexpectedly discharged. It is also conceivable to use a flow rate sensor to detect water cutoff. However, the flow path configuration is correspondingly complicated and the valve housing 4 is greatly increased in cost.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a hot and cold water mixing apparatus capable of quickly detecting and controlling water outage without complicating the structure.

[0005]

In order to solve the above-mentioned problems, a hot water mixing apparatus according to the present invention comprises: a mixing valve for mixing hot water and water to obtain an appropriate temperature; a mixing valve driving device for driving the mixing valve;
A thermistor for detecting the temperature of the mixed water, a flow control valve for adjusting the discharge amount of the mixed water, a setting device for setting a state amount of the mixed water, and the flow control based on the state amount set by the setting device. It comprises a flow rate control unit for controlling the valve, a temperature control unit for controlling the mixing valve via a mixing valve driving device based on a signal from the thermistor, and a controller having a water cutoff determining unit for determining whether or not water is cut off.

[0006]

With the above arrangement, the temperature controller of the controller changes the valve opening of the mixing valve via the mixing valve driving device while feeding back the thermistor signal so that the temperature becomes equal to the temperature set by the setting device. In adjusting the flow rate of hot and cold water, the water cut-off determining unit of the controller, when the signal of the thermistor has passed for a predetermined time in a state without fine temperature fluctuation,
It is determined that the water supply has been cut off, and the control corresponding thereto is performed.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to one embodiment of the present invention. In FIG. 1, there is a valve housing 19 having a hot water flow path 16, a water flow path 17, and one outflow path 18,
A hot water side valve element 20 and a hot water side valve seat 21 for adjusting the flow rate on the hot water side, a water side valve element 22 and a water side valve element 23 for adjusting the flow rate on the water side are provided in the two flow paths, respectively. A piston 24 having the same valve diameter and pressure receiving area and dividing the hot water flow path 16 and the water flow path 17 is disposed on the same shaft 25 between the valve element 20 and the water-side valve element 22. The mixing valve 26 that changes the flow rate of hot water and water is formed by the configuration in which the hot water side valve element 20 and the water side valve element 22 open and close in inverse proportion to each other. The mixing valve 26 is urged by a spring 27 in a direction in which the water-side valve seat 23 is fully opened, and a solenoid 29 and the solenoid 29 are used as a mixing valve driving device 28 for driving the mixing valve 26.
Is provided. When the solenoid 29 is energized, the plunger 30 pushes the shaft 25 connecting the hot water side valve body 20, the water side valve body 22, and the piston 24 against the spring 27, and operates in a direction to open the hot water side and close the water side. When the suction force of the solenoid 29 and the urging force of the spring 27 are balanced, the valve opening is maintained, and the flow rate ratio is changed by the amount of electricity supplied to the solenoid 29. Further, the valve housing 19 is provided with a mixing chamber 31 downstream of the hot water side valve body 20 and the water side valve body 22 where hot and cold water collide with each other and thereafter provided with an orifice 32. The thermistor 33 detects the temperature of the water. The thermistor 3
A flow control valve 34 for adjusting the discharge amount of the mixed water is provided downstream of 3. 35 is a setting device for setting the state quantity of the mixed water,
A controller 39 controls the flow control valve 34 based on the state quantity set by the setter 35.
And the mixing valve driving device 2 according to the signal of the thermistor 33.
A temperature control unit 37 for controlling the mixing valve 26 via 8 and a water cutoff determination unit 38 for determining whether or not water cutoff is to be performed based on a signal from the same thermistor 33.

Next, the operation of the above configuration will be described. FIG. 2 is a block diagram showing the flow of the control system. When a tapping instruction is given by the setter 35, the flow controller 36 of the controller 39 first opens the flow control valve 34. at the same time,
The temperature control unit 37 of the controller 39 controls the amount of increase or decrease of the current supplied to the solenoid 29 of the mixing valve driving device 28 based on the difference between the temperature set by the setter 35 and the temperature detected by the thermistor 33, and Is to be adjusted. On the other hand, in the water cut-off determining unit 38 of the controller 39, the flow control valve 34
The thermistor 3 is always open when the hot water is open.
When the state of the signal at a constant temperature and within a specified temperature range (for example, 0.2 ° C.) continues for a predetermined time (for example, 1 minute), it is determined that the water supply is cut off and the temperature control unit 37 is received. A water cutoff signal is sent, and the temperature control unit 37 of the control unit 39 stops the control. On the other hand, the flow control unit 36 receiving the water cutoff signal from the water cutoff determination unit 38 opens the flow control valve 34. That is, FIG. 3 shows detection signals of the thermistor 33 when the mixed water is flowing and when the water supply is stopped. FIG. 3A shows a detection signal of the thermistor 33 when the hot water and the water are mixed at a certain ratio, and when the hot water and the water are mixed, a certain small temperature change occurs. Even if the mixing promoting means is specially provided, a fluctuation of about 0.5 ° C. may occur. On the other hand, when the water is cut off, the detection signal of the thermistor 33 becomes a constant temperature without any variation as shown in FIG. In this case, what the thermistor 33 detects is the staying mixed water or the sucked air, and the detected temperature after the water cutoff is gentle due to the relationship between the temperature of the mixed water discharged before the water cutoff and the ambient temperature. Although the temperature may change due to the inclination, there is no temperature variation in a minute cycle, and the water cutoff can be detected only by the signal of the thermistor 33 in any case by managing the variation width and the duration.

[0009]

As described above, according to the hot and cold water mixing apparatus of the present invention, the controller has the water cut-off judging section and performs the water cut-off detection only by the signal of the thermistor. It is simple and economical, and when water is cut off, it is easy and safe to perform control corresponding to it.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hot water mixing apparatus according to one embodiment of the present invention.

FIG. 2 is a control block diagram of the controller.

FIG. 3 (a) is a signal output characteristic diagram of the thermistor at the time of normal tapping. FIG.

FIG. 4 is a cross-sectional view of a conventional hot water mixing apparatus.

[Explanation of symbols]

 26 mixing valve 28 mixing valve driving device 33 thermistor 34 flow control valve 35 setting device 36 flow control unit 37 temperature control unit 38 water cut-off determination unit 39 controller

Continuation of the front page (72) Inventor Bunichi Shiba 1006 Kazuma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 37/00 F24D 17 / 00

Claims (2)

(57) [Claims] A mixing valve for mixing hot water and water to obtain an appropriate temperature; a mixing valve driving device for driving the mixing valve; a thermistor for detecting a temperature of the mixed water; and a flow rate for adjusting a discharge amount of the mixed water. A control valve, a setter for setting a state quantity of the mixed water, a flow control unit for controlling the flow rate control valve based on the state quantity set by the setter, and a signal from the thermistor; A hot and cold water mixing apparatus comprising: a temperature control unit that controls a mixing valve via a controller; and a controller that has a water cutoff determination unit that determines whether or not water is cut off. 2. The hot water mixing system according to claim 1, wherein the water cutoff judging section of the controller judges that the water supply is cut off when a signal from the thermistor continues for a predetermined time within a specified temperature range while the flow control valve is open. apparatus.