JPH0684789B2 - 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 adjusting 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 device of this type has a structure as shown in FIG. (For example, Japanese Utility Model Laid-Open No. 55-59223) In FIG. 2, a hot water inlet 1, a water inlet 2 and a mixed hot water outlet 3
A hot water side valve body 5 and a water side valve body 6 are provided inside the valve frame body 4 having the above to adjust the mixing ratio of hot water and water.
The hot water valve body 5 and the water valve body 6 are fixedly provided on a shaft 7, and the shaft 7 is driven by a motor 10 via an external screw mechanism 8 and a gear 9. The temperature of the mixed hot water is detected by the temperature detector 11, and the controller 13 drives and controls the motor 10 so as to eliminate the temperature deviation from the temperature setting device 12 to adjust the mixed hot water temperature. That is, when the temperature of the mixed hot water to be obtained is set by the temperature setting device 12, the temperature of the mixed hot water is monitored by the temperature detector 11, and the hot water valve body 5 is placed at a position where the motor 10 can obtain an appropriate temperature.
Also, the water side valve body 6 is controlled.

Problems to be Solved by the Invention Since the conventional hot and cold water mixing apparatus is configured as described above, it has the following problems.

(1) Danger when the mixed hot water temperature set by the temperature setting device 12 cannot be obtained due to the failure of the motor 10 or the gear 9 as the drive unit or the sticking of the shaft 7, especially when hot water above the set value is supplied. Met.

(2) When the mixed hot water temperature overshoots the set value of the temperature setter 12 due to the hot water pressure fluctuation, the water pressure fluctuation, or the sudden change of the mixed flow rate, or the mixed hot water temperature overshoots because the supplied hot water sharply rises. It was dangerous.

The present invention solves the above-mentioned conventional problems, and an object thereof is to prevent the danger of stopping the supply of the mixed hot water and remove the discomfort when the temperature of the mixed hot water largely deviates from the set value.

Means for Solving Problems The hot and cold water mixing apparatus of the present invention in order to solve the above problems,
A mixing valve for adjusting the mixing ratio of hot water and water, a mixing valve drive device for driving the mixing valve, a mixed hot water temperature sensor for detecting the mixed hot water temperature, and a mixed hot water temperature setting device for setting the mixed hot water temperature, A flow rate control valve for starting / stopping the supply of the mixed hot water, a flow rate control valve drive device for driving the flow rate control valve, a hot water supply setting means for instructing the start / stop of the supply of the mixed hot water, and the mixed hot water by the hot water supply setting means When the flow control valve is opened to start the supply of mixed hot water, the mixed hot water temperature set value of the mixed hot water temperature setter and the signal of the mixed hot water temperature sensor are compared, and the mixed valve is driven according to the deviation. The mixing valve is controlled through the device to supply the hot water within the upper limit of the temperature that is normally used, and the signal of the hot water temperature sensor is used to make this hot water temperature sensor signal normally during the hot water supply. Set the upper limit of the temperature used with a range And if it exceeds the predetermined value constitute a controller that performs control for stopping the supply of the mixed water in the flow regulating valve controls the flow rate adjusting valve driving device e-polarized.

The present invention, by the above-mentioned configuration, compares the set value signals of the mixed hot water temperature sensor and the set value signal of the mixed hot water temperature setter, and drives and controls the mixing valve at a mixing ratio at which the set temperature of the mixed hot water temperature setter is obtained. To ensure safety by supplying mixed hot water within the upper limit of the temperature used, the signal from the mixed hot water temperature sensor indicates the upper limit of the temperature normally used during the supply of mixed hot water when the mixing valve malfunctions. When the value exceeds a predetermined value set with a certain width, the flow rate control valve drive device is controlled to stop the supply of the mixed hot water by the flow rate control valve for further safety.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, the hot water and water that have entered the valve frame body 16 from the hot water inlets 14 and 15 reach a mixing valve 18 via a pressure adjusting valve 17 that adjusts the pressures of the two and equalizes them. Mixing valve 18 is the hot side valve body
19 and a water side valve body 20 is a motor 22 provided outside through a shaft 21,
Drive device consisting of gear box 23 and linear motion conversion mechanism 24
Driven by 25. Then, the mixing ratio of the hot water and the water is changed by the mixing valve 18, and the hot water temperature of the hot water mixed with the hot water is detected by the hot water sensor 26. The amount of mixed hot water is detected by the flow rate sensor 27. The mixed water continues to flow control valve 28
The flow rate is adjusted and limited by the flow rate control valve 28, and the flow rate control valve 28 is driven by a flow rate control valve drive device 29 having the same configuration as the external mixing valve drive device 25. Finally, the mixed hot water is supplied from the mixed hot water outlet 30 through the hot water supply target outlet 31.
A setting device 32 that sets the temperature of the mixed hot water and instructs the supply / stop of the mixed hot water is provided near the discharge port 31.
The signal from the setter 32 is taken into the controller 33. Controller
The signals taken in by 33 are the signals of the flow rate sensor 27 and the signal of the mixed hot water temperature sensor 26, and the output signal is transmitted from the controller 33 to the mixing valve drive device 22 and the flow rate control valve drive device 29.

Next, the operation will be described. To start hot water supply when hot water supply is stopped When the hot water supply switch (not shown) of the setting device 32 is turned on, the flow rate control valve 28 causes the flow rate control valve drive device.
It is opened by receiving a command from the controller 33 via 29. Hot water and water supplied from the hot water inlet 14 and the water inlet 15 are pressure regulating valves.
The pressure is equalized at 17 and the mixing ratio of hot water and water is adjusted at the mixing valve 18. The mixed mixed hot water is detected by the mixed hot water temperature sensor 26, and the controller 32 compares the mixed hot water temperature set value signal set by the setting device 32 with the signal of the mixed hot water temperature sensor 26 to eliminate the deviation between both signals. Thus, the mixing valve drive device 25 is drive-controlled to adjust the temperature of the mixed hot water. The flow rate sensor 27 serves to stop the operation of the mixing valve 18 when the temperature of the mixed hot water falls below a predetermined value, and
Instantaneous value detection is performed to integrate the temperature of the mixed hot water and adjust the flow rate of the mixed hot water. The flow rate control valve unit 28 regulates the flow rate of the mixed hot water and supplies it to the hot water supply target. Normally, the mixed hot water having the temperature designated by the setting device 32 is supplied in this manner. In the unlikely event that the mixing valve drive device 25 or the mixing valve 18 fails, the controller 33
If the mixing valve control circuit (not shown) therein fails, the mixed hot water cannot be supplied at the temperature instructed by the setter 32. Especially when a high temperature is supplied, it may be exposed to hot water, which is dangerous. In such a case, the controller 33 first determines that the mixed hot water temperature detected by the mixed hot water temperature sensor 26 does not reach the set value set by the setting device 32.

Next, it is determined that the temperature deviation is not resolved even after the predetermined time required for the control operation of the mixing valve 18, and the flow rate control valve 28 is controlled to be closed via the flow rate control valve drive device 29. Unit 33 gives a command. The flow rate control valve 28 stops the supply of the mixed hot water to prevent the supply of hot water and the supply of cold water. Particularly dangerous is that hot water is supplied and bathed in the body. As a countermeasure against this, when the object to be supplied with the mixed hot water is a shower, the mixed water is stopped by the flow rate control valve 28 when it exceeds the predetermined value 50 ° C, which is set with a certain width to the upper limit value of 45 ° C that is normally used. There is.

Even before the failure, the mixed hot water temperature may overshoot or undershoot due to a sudden change in the water pressure, the hot water pressure, the flow rate of the supplied mixed hot water, or a sudden change in the supplied hot water temperature. In such a case, the controller 33 compares the mixed hot water temperature set value signal of the setting device 32 and the mixed hot water temperature signal detected by the mixed hot water temperature sensor 26, and the deviation width becomes equal to or larger than a predetermined value, for example, 2 deg. Opens and the flow control valve
At 28, the flow rate is extremely reduced and reduced. The throttled flow rate is controlled by the controller 33 via the flow rate control valve drive device 29 to a predetermined value while monitoring the signal of the flow rate sensor 27. At this time, if the supply of the mixed hot water is stopped, dissatisfaction will remain because it is still in use, and since the mixing valve 18 will not be controlled because hot water and water will not be supplied, a problem remains, so it has not been stopped. .

When hot water supply is finally unnecessary, the hot water supply switch of the setting device 32 is turned off, and the flow rate control 28 stops the supply of the mixed hot water. It should be noted that the hot water supply can be stopped even if the water heater fails or the stored hot water comes out. Further, when using an instantaneous water heater, it is possible to speed up the rise of the water temperature by reducing the flow rate at the initial start.

In this embodiment, the controller 33 can stop the mixed hot water when the signal of the mixed hot water temperature sensor 26 exceeds a predetermined value set with a width in the upper limit value of the normally used temperature.
It has the effect that the critical temperature is defined as an absolute value rather than a deviation.

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

(1) The set value of the mixed hot water temperature setter is compared with the signal of the mixed hot water temperature sensor, and the mixed valve is controlled according to the deviation to supply the mixed hot water within the upper limit of the temperature normally used. , Especially when supplying mixed hot water to a shower, etc., and it is dangerous if the signal of the mixed hot water temperature sensor exceeds a specified value set with a wide upper limit of the temperature that is normally used. Therefore, the flow rate control valve urgently stops the supply of the mixed hot water, which further improves the safety.

(2) A flow control valve for starting / stopping the supply of the mixed hot water and a hot water supply setting means for instructing the start / stop of the mixed hot water are provided,
Since the flow control valve is opened to start the supply of the mixed hot water in response to the instruction to start the mixed hot water supply from the hot water supply setting means, it is possible to eliminate the heavy manual operation of the hot water tap and improve the operability, and Since the supply of the mixed hot water can be stopped urgently by the flow rate control valve provided for starting and stopping the supply, one flow rate control valve can be used to start and stop the supply of the normal mixed hot water and mix the hot water at the time of danger. It can serve the dual function of emergency stop.

(3) The mixed hot water temperature sensor used for controlling the mixing valve is
Since it can be used for emergency stop of the mixed hot water by the flow rate control valve when the value exceeds a predetermined value, one mixed hot water temperature sensor should perform two functions of adjusting the temperature of the mixed hot water and detecting the temperature in case of danger. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a hot and cold water mixing apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional hot and cold water mixing apparatus. 18 …… Mixing valve, 25 …… Mixing valve drive device, 26 …… Mixed hot water temperature sensor, 28 …… Flow control valve, 29 …… Flow control valve driving device, 32 …… Setting device (mixed hot water temperature setting device) , 33 …… Controller.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichi Ueki, 1006, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP 58-60321 (JP, A) JP 58-22402 (JP, A) Actual opening Sho 58-138875 (JP, U) Actual opening Sho 59-58054 (JP, U) Actual opening Sho 47-34656 (JP, U) Actual opening Sho 59-165001 (JP, U) Actual Open Sho 58-171513 (JP, U)

Claims (1)

[Claims] 1. A mixing valve for adjusting a mixing ratio of hot water and water, a mixing valve driving device for driving the mixing valve, a mixed hot water temperature sensor for detecting a mixed hot water temperature, and a mixed hot water for setting a mixed hot water temperature. A temperature setting device and a flow control valve that starts and stops the supply of mixed hot water,
A flow rate control valve drive device for driving the flow rate control valve, a hot water supply setting means for instructing start / stop of the supply of the mixed hot water, and a flow control valve drive device for instructing the start of the mixed hot water by the hot water supply setting means. While opening the flow rate control valve and starting the supply of the mixed hot water, the mixed hot water temperature set value of the mixed hot water temperature setter and the signal of the mixed hot water temperature sensor are compared, and the mixed valve driving device is operated according to the deviation. It controls the mixing valve via the above, and supplies the mixed hot water within the upper limit of the temperature that is normally used, and the signal of the mixed hot water temperature sensor is used to supply the mixed hot water temperature sensor signal during the supply of the mixed hot water. Control for controlling the flow rate control valve drive device and controlling the flow rate control valve to stop the supply of the mixed hot water when the upper limit value of the normally used temperature exceeds a predetermined value set with a range A hot and cold water mixing device consisting of a vessel.