JPH05595B2 - - Google Patents

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 Conventionally, there has been a hot water mixing device of this type as shown in FIG. (For example, Japanese Utility Model Publication No. 55-59223) In FIG. 2, inside a valve frame 4 having a hot water inlet 1, a water inlet 2, and a mixing hot water outlet 3, there are a hot water side valve body 5 and a water side valve body 6. is installed 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 the shaft 7.
is connected to the motor 1 via an external screw mechanism 8 and gear 9.
Driven by 0. 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 the desired mixed water temperature is set with the temperature setting device 12, the temperature detector 11 monitors the mixed water temperature, and the motor 10 moves the hot water side valve body 5 and the water side valve body 6 to a position where an appropriate temperature can be obtained. It is something to control.

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) When the faucet etc. is closed and the supply of mixed hot water is stopped, the temperature around the temperature detector 11 will cool down due to natural cooling, and the temperature setting device 1 will follow this.
In order to obtain the mixed water temperature indicated by 2, the hot water side valve body 5 is driven in the opening direction and the water side valve body 6 is driven in the closing direction, so when hot water supply is restarted, hot water will be supplied and it is dangerous. It was hot.

(2) If the faucet is suddenly opened from a state where the faucet has been throttled and the flow rate of mixed hot water is low, or conversely, when the faucet is suddenly closed from a state where the flow is high, the temperature of the mixed water may overshoot or undershoot. It was hot. This is because when the flow rate decreases, the pressure loss between hot water and water at the hot water side valve body 5 and water side valve body 6 decreases, so the difference in pressure change between hot water and water greatly affects the valve position. Therefore, even when the mixed water temperature is the same, the valve position is different when the flow rate is large and when the flow rate is low, and the mixed water temperature changes when the flow rate changes suddenly. These overshoots and undershoots tend to increase as the throttled flow rate decreases, and unless the pressure of the hot water is completely equal at any flow rate, changes will occur.

The present invention solves such conventional problems,
The purpose of this is to stop the operation of the mixing valve when the flow rate of mixed hot water is reduced to a predetermined value, and to start operation when the flow rate exceeds a predetermined value, thereby preventing the supply of hot water, overshooting, and undershooting.

Means for Solving the Problems In order to solve the above problems, the hot water mixing device of the present invention includes a mixing valve that adjusts the mixing ratio of hot water and water;
A drive device that drives this mixing valve, a mixing water temperature sensor that detects the mixed water temperature, a flow rate sensor that detects the mixing flow rate, a mixing water temperature setting device that sets the mixing water temperature, and the drive device are controlled. It is equipped with a controller that adjusts the temperature of the mixed water and controls the start and stop of the drive device based on the signal from the flow rate sensor.

Effects of the present invention With the above-described configuration, the mixed water temperature set by the mixed water temperature setting device and the mixed water temperature detected by the mixed water temperature sensor are compared, and the mixing valve is controlled via the drive device according to the deviation. At the same time, when the mixed flow rate detected by the flow rate sensor is below a preset value, the control operation of the drive device is stopped, and the control operation is performed when the mixed flow rate is above the set value, so that the flow rate of mixed hot water is temporarily stopped or suddenly stopped. This is intended to prevent the supply of hot water when the temperature is increased or decreased and to reduce fluctuations in the mixed water temperature.

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

In Figure 1, hot water inlet 14, water inlet 1
5. A pressure regulating valve 18 for equalizing the pressure of hot water and water is installed inside the valve frame 17 having a mixed hot water outlet 16;
A mixing valve 19 for adjusting the mixing ratio of hot water and water, a mixing water temperature sensor 20 for detecting the mixed water temperature, and a flow rate sensor 21 for detecting the flow rate of the mixed water are built in. The pressure regulating valve 18 has a hot water side valve body 22 and a water side valve body 23 connected to a piston 24.
The secondary pressures of hot water and water are regulated so that they are equal. In the mixing valve 19, a hot water side valve body 25 and a water side valve body 26 are driven via a shaft 27 by a drive device 30 comprising an external motor 88 and a linear motion conversion mechanism 29. Also, a fixed impeller 31 that swirls the flow of the flow rate sensor 21, a ball 32 made of a magnetic material that is rotated by the swirling flow, a receiving plate 33 that prevents the ball from flowing out, and a magnetic resistance element that detects the rotation of the ball. It consists of 34. Flow rate sensor 21
The signal from the mixed hot water sensor 20 is taken into the controller 35. The controller 35 includes a mixing hot water temperature setting device 3.
6 signal is also taken in. 37 is a variable volume of a flow rate setting value provided in the mixing hot water temperature setting device 36, which starts and stops the drive device 30 based on the signal from the flow rate sensor 21;
38 is a display tube that displays the amount of heat output from the controller 35, and 39 is a faucet.

To describe the function of the above configuration, the hot water inlet 1
4. The hot water and water entering the valve body 17 from the water inlet 15 have their pressures adjusted by the pressure regulating valve 18 to become equal pressures and are sent to the mixing valve 19. In the mixing valve, hot water and water are connected to the shaft 27, and the hot water side valve body 25 and the water side valve body 26 are connected to the shaft 27.
The quantity can be changed inversely by being driven by the drive device 30 via. The temperature of the mixed hot water is detected by the mixed hot water temperature sensor 20, and compared with the set value of the mixed hot water temperature setting device 36 by the controller 35, and the controller 35 controls the drive device 30 to adjust the mixing ratio to obtain the set value. Then, the mixing ratio of the mixing valve 19 is adjusted. When the faucet 39 is operated and the flow rate is increased or decreased, the amount of hot water will naturally increase or decrease, but the mixing ratio is determined by the mixing valve 1.
Unless the hot water pressure and water pressure applied to 9 are completely equal pressure, they will be different, so the mixed hot water temperature will fluctuate. Since there is a pressure regulating valve 18 that adjusts the pressure of hot water/water, there will be less fluctuation compared to the condition where the source pressure of hot water/water is directly applied, but the function of the pressure regulating valve 18 is not perfect, so it will still fluctuate. There is. This fluctuation in the mixed water temperature is caused by a slight imbalance in the pressure after adjustment by the pressure regulating valve 18 because when the flow rate of the mixed water decreases, the pressure loss at the mixing valve 19 section decreases in proportion to the square of the flow rate. Even if the temperature is too high, the valve position of the mixing valve 19 will change drastically compared to when the flow rate is high. Therefore, if the flow rate of the mixed hot water is suddenly increased from a low state, or suddenly reduced from a high flow state, the mixing valve position that can supply the set mixed water temperature will vary greatly, and the mixed water will instantly drop. The temperature is overshooting or undershooting. In this embodiment, the driving device 30 stops driving the mixing valve 19 when the flow rate of mixed hot water falls to a set value (for example, 3/min) using the signal from the flow rate sensor 21, and starts the mixing valve 19 when the flow rate exceeds the set value. has started. For this reason, the position of the mixing valve 19 is fixed before the flow rate becomes small and the position of the mixing valve 19 changes drastically from that at the time of a large flow rate, which prevents large fluctuations in the mixed water temperature when the flow rate suddenly changes. This is something that is being prevented. The set value can be changed by a variable volume 37, and is designed to be used depending on the purpose. Further, since the values of the mixed water temperature sensor 20 and the flow rate sensor 21 can be calculated by the controller 35 and outputted to the display tube 38, it is possible to know the amount of heat to be supplied. Even if the hot water supply is stopped and the faucet 39 is closed, the ambient temperature of the mixed water temperature sensor 20 decreases and the valve position of the mixing valve 19 does not move as in the conventional case, so hot water will not be supplied when hot water is re-discharged. do not have.

In this embodiment, the drive device 30 is the mixing valve 1
The setting value for starting and stopping the drive control 9 is variable by operating the variable volume 37, so depending on the purpose of use, for example, you can select a state where the steady state characteristics are good even if the transient temperature characteristics are somewhat poor even at low flow rates. Although it is not used for applications up to small flow rates, it has the effect of allowing for different uses, such as emphasizing transient temperature characteristics associated with sudden changes in flow rate. In addition, the controller 35 also controls the mixing water temperature sensor 2.
0 and the signal from the flow rate sensor 21 to display the display tube 38.
Since it can be output as a calorific value, it has the effect of making it possible to know the calorific value supplied as mixed hot water.

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

(1) When the mixed flow rate detected by the flow rate sensor is below a preset value, the control operation of the drive device is stopped, and when it is above the set value, the control operation is performed. It is safe because it prevents hot water from being supplied when the door is opened again after a while.

(2) For the same reason as above, temperature fluctuations in the mixed hot water temperature due to sudden changes in flow rate, especially when there is a state of low flow rate, can be reduced.

(3) Using the flow rate sensor signal, it becomes possible to display the amount of heat by calculation with the mixed water temperature sensor signal, or to display the flow rate itself, which increases the convenience of using the device.

[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 showing a conventional hot water mixing device. 19...Mixing valve, 20...Mixing water temperature sensor, 2
1...Flow rate sensor, 30...Drive device, 35...
Controller, 36...Mixing water temperature setting device.

Claims (1)

[Claims] 1. A mixing valve that adjusts the mixing ratio of hot water and water, a drive device that drives the mixing valve, a mixing water temperature sensor that detects the mixing temperature, and a flow rate sensor that detects the mixing flow rate. A mixing water temperature setting device for setting the mixing water temperature;
The mixing water temperature set value set by the mixing water temperature setting device is compared with the signal from the mixing water temperature sensor, and the mixing valve is controlled via the driving device according to the deviation, and the mixing valve is detected by the flow rate sensor. A hot water mixing device comprising a controller that stops the control operation of the driving device when the mixed flow rate is below a preset value, and performs the control operation when the mixed flow rate is above the set value. 2. The hot water mixing device according to claim 1, wherein the set value is variable within a predetermined range. 3. The hot water mixing device according to claim 1, wherein the controller calculates signals from the mixed hot water temperature sensor and the flow rate sensor and outputs the signals as a calorific value.