JPS61124780A - Hot-water mixing apparatus - Google Patents

Abstract

PURPOSE:To previously prevent danger even if the mixed hot-water temperature deviates from a set value because of a trouble, by controlling a mmixing-valve driving apparatus and a flow-rate adjusting-valve driving apparatus according to the deviation between the set value of the mixed hot-water temperature and the signal of a mixed hot-water temperature sensor. CONSTITUTION:The mixed hot-water temperature value signal set in a setting device 32 and the signal of a mixed hot-water temperature sensor 26 are com pared in a controller 32. Said controller 32 drive-controls a mixing-valve driving apparatus 24, in order to eliminate the deviation between the both signals, and the mixed hot-water temperature is adjusted. A flow-rate sensor 27 stops the operation of a mixing valve 18 when the amount of mixing hot-water reduces below a prescribed value. In case of the trouble in which the tempera ture difference is not eliminated even after the lapse of a prescribed time neces sary for the control operation of the mixing valve 18, a controller 33 transmits an instruction to close a flow-rate adjusting valve 28 through a flow-rate adjusting valve driving apparatus 29.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing device that adjusts the mixing ratio of hot water and water to obtain an appropriate temperature.

2. Description of the Related Art A conventional hot water mixing device of this kind is shown in FIG. (For example, Japanese Utility Model Publication No. 55-59223) In Fig. 2, hot water inlet 1, water inlet 2, and mixing water inlet 3
Inside the valve frame body 4 having a hot water side valve body 5 and a water side valve body 6 are provided to adjust the mixing ratio of hot water and water.

The hot water side valve body 5 and the water side valve body 6 are fixedly provided on a shaft 7, and this 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 a temperature detector 11, and a controller 13 drives and controls the motor 10 to adjust the temperature of the mixed hot water so as to eliminate the temperature deviation from the temperature setting device 12. That is, when you set the desired mixed water temperature with the temperature setting device 12, the temperature detector 11
While monitoring the temperature of the mixed hot water, the motor 10 controls the hot water side valve body 5 and the water side valve body 6 to positions where an appropriate temperature is obtained.

Problems to be Solved by the Invention Since the conventional hot water mixing device was constructed as described above, it had the following problems.

(1) If the mixed water temperature set by the temperature setting device 12 cannot be obtained due to a malfunction of the motor 10 or gear 9 that is the drive unit or a sticking of the shaft 7, it is dangerous, especially if hot water exceeding the set value is supplied. Met.

@ It is dangerous if the mixed water temperature overshoots the set value of the temperature setting device 12 due to hot water pressure fluctuations, water pressure fluctuations, or sudden changes in the mixing flow rate, or if the mixed water temperature overshoots due to a sudden increase in the supplied hot water temperature. Atsushi. On the other hand, when the vehicle undershoots, it causes discomfort, especially when taking a shower.

The present invention solves such conventional problems by stopping the supply of mixed hot water or reducing the supply amount when the mixed hot water temperature deviates significantly from the set value, thereby preventing danger and reducing discomfort. The purpose is to remove.

Means for Solving the Problems In order to solve the above problems, the hot water mixing device of the present invention has the following features:
A mixing valve that adjusts the mixing ratio of hot water and water, a mixing valve driving device that drives the mixing valve, a mixing water temperature sensor that detects the mixed water temperature, and a mixing water temperature setting device that sets the mixed water temperature. a flow rate control valve that adjusts the amount of mixed hot water; a flow rate control valve drive device;
Consists of a controller that controls the mixing valve via the mixing valve drive device, and also compares the mixing water temperature sensor signal and the set value signal of the mixing water temperature setting device to control the flow rate adjustment valve via the flow rate adjustment valve drive device. It is something that will be done.

According to the above-described configuration, the present invention compares the set value signals of the mixing water temperature sensor and the mixing water temperature setting device, and drives and controls the mixing valve to a mixing ratio that obtains the set temperature of the mixing water temperature setting device. The flow rate adjustment yf is controlled by comparing the mixed water temperature sensor signal and the setting value signal of the mixing water temperature setting device, and control is performed to limit the supply of mixed hot water.If the mixing valve drive device or mixing valve breaks down, the flow rate adjustment is performed. Control is performed to stop the supply of mixed hot water using a valve to avoid the supply of hot water, or to completely reduce the supply IfPf of mixed hot water when there is a transient sudden change in temperature.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, hot water and water entering the valve frame 16 from the hot water inlet 14 and the water inlet 15 reach the mixing valve 18 through the pressure regulating valve 17 that adjusts and equalizes the pressure of both. . In the mixing valve 18, a hot water side valve body 19 and a water side valve body 20 are driven via a shaft 21 by a drive device 25 including a motor 22, a gear box 23, and a linear motion conversion mechanism 24 provided externally.

The mixing ratio of hot water and water is changed by the mixing valve 18, and the temperature of the mixed hot water is detected by the mixed water temperature sensor 26. Further, the amount of mixed hot water is detected by a flow rate sensor 27. The flow rate of the mixed hot water is then regulated and restricted by a flow rate control valve 28, which is driven by a flow rate control valve drive device 29 having the same configuration as the mixing valve drive device 25 provided outside. Finally, the mixed hot water is supplied from the mixed hot water outlet 30 via the discharge port 31 to which hot water is to be supplied.

A setting device 32 is provided near the discharge port 31 to set the temperature of the mixed hot water and to instruct supply/stop of the mixed hot water. This signal from the setting device 32 is taken into the controller 33. In addition to the signals taken into the controller 33, the flow rate sensor 2
7 is a signal from the mixing water temperature sensor 26, and an output signal is transmitted from the controller 33 to the mixing valve driving device 22 and the flow control valve driving device 29.

Next, we will discuss the effect. To start hot water supply from a state where hot water supply is stopped, turn on the hot water supply switch (not shown) of the setting device 32, and the flow rate control valve 28 is activated by the flow rate control valve drive device 29 of the controller 33. It is opened upon receiving orders.

The hot water and water supplied from the hot water inlet 14 and the water inlet 15 are
The pressure is equalized by the pressure regulating valve 17, and the mixing ratio of hot water and water is adjusted by the mixing valve 18. The mixed hot water is detected by the mixed hot water temperature sensor 26, and the mixed hot water temperature set value signal set by the setting device 32 and the signal from the mixed hot water temperature sensor 26 are sent to the controller 3.
2 are compared, and the mixing valve driving device 25 is controlled to adjust the temperature of the mixed water so as to eliminate the deviation between the two signals. The flow rate sensor 27 serves to stop the operation of the mixing valve 18 when the amount of mixed hot water falls below a predetermined value, and also performs integration of the amount of mixed hot water and instantaneous value detection for adjusting the flow rate of the mixed hot water. The flow rate regulating valve unit 28 adjusts the flow rate of the mixed hot water to supply hot water to the target hot water supply. Normally, mixed hot water at the temperature specified by the setting device 32 is supplied in this way.

In the unlikely event that the mixing valve drive device 25 or the mixing valve 18 breaks down,
If the mixing valve control circuit (not shown) in the controller 33 fails, the mixed hot water will not be supplied at the temperature specified by the setting device 32. In particular, if high temperatures are supplied, there is a risk of being exposed to boiling water, which is dangerous.

In such a case, the controller 33 first determines that the mixed water temperature detected by the mixed water temperature sensor 26 does not reach the set value set by the setting device 32.

Next, it is determined that the temperature deviation has not been eliminated even after a predetermined time period required for the control operation of the mixing valve 18 has elapsed;
The controller 33 issues a command to close the flow rate control valve 28 via the flow rate control valve driving device 29 . The flow control valve 2B stops the supply of mixed hot water and prevents the supply of hot water or cold water. Particularly dangerous is being provided with boiling water and bathing the body with it. As a countermeasure for this, when the mixed hot water is supplied to a shower, the flow rate control valve 28 is used to stop the mixed hot water when the temperature exceeds a predetermined value of 50°C, which is set with a certain degree of variation from the normally used upper limit of 45°C. You can also do it.

Further, even if there is no failure, the mixed hot water temperature may overshoot or undershoot due to sudden changes in conditions such as water pressure fluctuations, hot water pressure fluctuations, flow rate fluctuations of the supplied mixed hot water, or sudden changes in the supplied hot water temperature. In such a case, the controller 33
Compare the mixed water temperature set value signal of 2 and the mixed water temperature signal detected by the mixed water temperature sensor 26, and if the deviation width exceeds a predetermined value such as 5 deg, the flow rate is throttled with the flow rate control valve. reduce This narrowed flow rate is controlled by the controller 33 while monitoring the signal from the flow rate sensor 27 until it reaches a predetermined value.
This is done via the flow control valve drive device 29.

At this time, if the supply of mixed hot water is stopped, dissatisfaction will remain because the user is using it, and since hot water and water are not supplied, the mixing valve 18 will not be controlled and the problem will remain, so we do not stop it. 0 When hot water supply is finally no longer necessary, when the hot water supply switch of the setting device 32 is turned off, the flow rate adjustment 28 stops supplying the mixed hot water. Additionally, if the water heater breaks down or the stored hot water runs out, the hot water supply can be stopped. Also, when using an instantaneous water heater, it is possible to increase the temperature of the water more quickly by reducing the flow rate at the initial start.

In this embodiment, the controller 33 is the mixed water temperature sensor 2.
If the deviation between the signal No. 6 and the setting value signal of the setting device 320 is not resolved for a predetermined period of time, the flow control valve 28 stops the supply of mixed hot water.
8 has the effect of preventing complete closure.

In addition, for specific hot water supply objects such as showers, the controller 33
When the signal from the mixed water temperature sensor 26 exceeds a predetermined value,
Since the mixed hot water can be stopped, it has the effect of determining the critical temperature as an absolute value rather than as a deviation.

Further, the controller 33 can throttle the mixed water flow rate with the flow rate adjustment valve 28 when the mixed water temperature sensor 26 signal and the set value signal of the mixed water temperature setting device 32 exceed a predetermined deviation range. In the case of transient temperature fluctuations, it is possible to prevent a large amount of high or low temperature hot water from being sent to the hot water supply target, and the control operation of the mixing valve 18 is not impaired.

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

(1) If the mixing valve drive device, the mixing valve itself, or the mixing valve control circuit of the controller breaks down and mixed hot water is not supplied at the temperature specified by the setting device, the flow rate control valve will supply mixed hot water. can be stopped and dangers can be prevented.

(21 hot water) The amount of mixed hot water can be reduced during transient temperature fluctuations such as water pressure fluctuations, flow rate fluctuations, and sudden changes in the temperature of the supplied hot water, so discomfort during hot water use can be reduced.

(3) The flow control valve can also be used to start and stop hot water supply during normal use, which has advantages in terms of configuration and cost.

(The mixing hot water temperature sensor 71 can be used both for controlling the mixing valve and for controlling the flow rate regulating valve, which has advantages in terms of configuration and cost.

(5) It is possible to increase convenience by stopping the hot water supply when the hot water supply machine malfunctions and hot water is not supplied, or when the hot water supply starts at the initial start-up, or by reducing the flow rate and speeding up the start-up.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water mixing device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional hot water mixing device. 18...Mixing valve, 25...Mixing valve drive device, 26...Mixing water temperature sensor, 28...Flow rate adjustment valve, 29...Flow rate adjustment Valve drive device, 32.
...Setting device (mixed hot water temperature setting device), 33...Controller. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 f! I
tJ・=IL4boatσ...Sisan S, jet t-...Sakai now wrong i+lh soup 2I...Tane amount tone S now 29.41! ! II! Valve M, wJii 32...Setting device Fig. 2

Claims (4)

[Claims] (1) A mixing valve that adjusts the mixing ratio of hot water and water, a mixing valve drive device that drives this mixing valve, a mixing water temperature sensor that detects the mixed water temperature, and a mixing water temperature setting that sets the mixed water temperature. Comparing the mixing water temperature setting value of the mixing water temperature setting device with the mixing water temperature setting value of the mixing water temperature setting device and the signal of the mixing water temperature sensor, The mixing valve is controlled via the mixing valve driving device according to the deviation, and the mixing water temperature sensor signal and the setting value signal of the mixing hot water temperature setting device are compared and the control is performed via the flow rate regulating valve driving device. A hot water mixing device consisting of a controller that controls a flow control valve to limit the supply of mixed hot water. (2) The controller controls the flow control valve to stop the supply of mixed hot water if the deviation between the mixed hot water temperature sensor signal and the set value signal of the mixed hot water temperature setting device is not resolved for a predetermined period of time. The hot water mixing device according to item 1. (3) The hot water mixing device according to claim 1, wherein the controller controls the flow control valve to stop supplying the mixed hot water when the mixed hot water temperature sensor signal exceeds a predetermined value. (4) The controller performs control to reduce the flow rate of the mixed hot water using the flow control valve when the mixed hot water temperature sensor signal and the set value signal of the mixed hot water temperature setting device exceed a predetermined deviation range. The hot water mixing device according to scope 1.