JPH0799222B2 - Hot water mixing controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing controller for adjusting a mixing ratio of high temperature water and low temperature water to obtain an optimum mixed hot water temperature.

2. Description of the Related Art FIG. 5 is a block diagram of a conventional hot and cold water mixing controller.

(For example, Japanese Utility Model Laid-Open No. 61-18424) Reference numeral 1 is a water supply pipe, 2 is a high temperature hot water supply pipe, and 3 is a mixed hot water outlet. Reference numeral 4 is a water side valve, and 5 is a hot water side valve. A thermistor 6 detects the temperature of the mixed hot water and notifies the hot water temperature signal to the controller 7. A controller 8 is connected to the controller 7 to set the hot water supply temperature, and the set temperature is input to the controller 7. Based on the temperature difference between the mixed hot water temperature signal detected by the thermistor 6 and the set temperature signal set by the controller 8, the controller 7 operates the water side valve 4 and the hot water side valve 5 to control the temperature of the mixed water. Adjust.

However, in the hot and cold water mixing control device, in order to obtain a hot water mixed at an appropriate temperature from the initial stage of hot water discharge, the water side valve 4 and the hot water side valve 5 must be simultaneously opened at a ratio suitable for the appropriate temperature.

At this time, it is difficult to obtain the above ratio unless the water temperature and the supplied hot water temperature are known, and if this ratio is not appropriate, hot water that is far from the set temperature will come out.

Problems to be Solved by the Invention With the above configuration, if the water valve is opened early at the start of tapping, cold water first comes out of the mixed hot water outlet, which causes discomfort during use. On the contrary, if the hot water valve opens early, hot water comes out of the mixed hot water outlet, which is very dangerous.

The present invention has been made in consideration of this drawback, and an object of the present invention is to provide a stable hot and cold water mixing control device by determining the supplied hot water temperature from the temperature change of the hot water mixing when the tapping is stopped.

Means for Solving the Problems In order to solve the above problems, the hot and cold water mixing control device of the present invention includes a water side valve, a hot water side valve, and a first drive means for urging the water side valve, Second drive means for urging the hot water valve,
A mixed hot water temperature detecting means for detecting the mixed hot water temperature, a water temperature detecting means for detecting the water temperature, a temperature gradient detecting means for detecting a change gradient of the mixed hot water temperature, and a mixed hot water temperature setting means for setting the mixed hot water temperature, Main control means for controlling the mixed hot water temperature by driving the first drive means and the second drive means using signals of the mixed hot water temperature detection means, the temperature gradient detection means, and the mixed hot water temperature setting means. The main control means is configured to estimate the supplied hot water temperature by a signal from the temperature gradient detection means when the hot water discharge is stopped.

Function When the hot water is stopped, the hot water temperature to be supplied is calculated from the time change of the hot water temperature.

The output amount of the main control means is determined by using the supplied hot water temperature, and the output amount drives the first drive means and the second drive means to open the water side valve and the hot water side valve to discharge hot water.

In this case, since it is possible to supply hot water at the set temperature immediately after tapping hot water, it is safe that cold water or hot water does not come out.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
The figure is a cross-sectional view of the hot and cold water mixing control apparatus of the present invention. Reference numeral 9 is a water supply pipe, 10 is a hot water temperature supply pipe, and 11 is a mixed hot water outlet. 12 is a water valve, and 13 is a hot water valve. Water side valve 12 is the valve shaft
The first drive means 15 (for example, a motor) fixed to 14
More urged. Similarly, the hot water valve 13 is also fixed to the valve shaft 16,
It is energized by the second drive means 17. Reference numeral 18 denotes a mixed hot water temperature detecting means for detecting the mixed hot water temperature. Reference numeral 19 is a flow rate detecting means for detecting the amount of hot water discharged. Reference numeral 20 is a control device for urging the first driving means 15 and the second driving means 17. 21 and 22 are closing position setting means (for example, a micro switch). Reference numeral 23 is hot water to be mixed, and an equalization valve that operates in a direction to eliminate the pressure difference between the water.

FIG. 2 shows the structures of the water valve 12 and the hot water valve 13.

FIG. 3 shows an example of the control device 20. 24 is a mixed hot water temperature setting means. Reference numeral 25 is a temperature gradient detecting means for detecting the gradient of change in the temperature of the mixed hot water. 26 is a main control means for controlling the temperature of the mixed hot water. 27 is a biasing amount setting means for determining the biasing amounts of the first driving means 15 and the second driving means 17.

Next, the operation of the configuration of the present invention will be described.

The ratio W of the amount of water and the amount of hot water when hot water is being supplied at the set temperature can be expressed as follows. Equation (1) is established, where T _{W is} the water temperature, T _{H is} the hot water supply temperature, T _{O is} the hot water temperature, Q _{W is} the water amount, Q _{H is} the hot water supply amount, and Q _O is the hot water discharge amount.

T _H Q _H + T _W Q _W = T _O Q _O (1) Here, Q _O can be expressed by equation (2).

Q _O = Q _H + Q _W (2) Therefore, from formulas (1) and (2), W = Q _H / Q _W is (3)
It can be expressed as a formula.

With this flow rate ratio W, the first drive means 15 and the second drive means
By driving 17 and adjusting the valve openings of the water side valve 12 and the hot water side valve 13, hot water discharge and stop operations at a set temperature are possible.

When using equation (3), the water temperature and the supplied hot water temperature must be known. In this embodiment, as the water temperature detecting means, the water side valve 12 is first driven by the first driving means 15 and the mixed hot water temperature detecting means 18 detects the water temperature only at the start of the first hot water discharge.

Next, when stopped, the mixed hot water temperature is detected by the mixed hot water temperature detecting means 18. From the value, the temperature gradient detecting means 25 detects the change gradient of the outlet hot water temperature, and the main control means 26 estimates the supplied hot water temperature from the change gradient.

The supplied hot water temperature can be determined from the time change (temperature gradient) of the mixed hot water temperature at the time of stop and the set temperature.

FIG. 4 shows an example of the relationship between the time change of the mixed hot water temperature and the supplied hot water temperature at the time of stop. When the hot water valve is driven by the same amount and the set temperature is high, the temperature change gradient becomes small because the hot water supply amount is large even if the hot water temperature is the same. Conversely, when the set temperature is low, the temperature change gradient becomes large. The relationship between the temperature change gradient and the supplied hot water temperature according to the set temperature can be set in the main control means 26 in advance.

By substituting the supplied hot water temperature into the equation (3), the flow rate ratio W at an arbitrary hot water discharge temperature can be obtained.

Therefore, if the first drive means 15 and the second drive means 17 are driven at the flow rate ratio W and the water side valve 12 and the hot water side valve 13 are opened, it is possible to supply hot water at the set temperature immediately after tapping.

EFFECTS OF THE INVENTION As described above, according to the hot and cold water mixing control device of the present invention, the mixed hot water temperature is obtained, and further the supplied hot water temperature can be estimated by the temperature gradient detecting means.

If the water temperature is obtained by using the mixed hot water temperature detecting means or by using the estimated value, the mixing ratio can be calculated accurately, so that hot water can be supplied at any set temperature from the initial stage of hot water discharge. .

In particular, when using the shower, it is possible to obtain a safety and usability that is drastically improved without generating cold water or hot water that is different from the set temperature.

[Brief description of drawings]

FIG. 1 is a sectional view of a hot and cold water mixing control apparatus according to an embodiment of the present invention, FIGS. 2a and 2b are plan and front views of a valve of the hot and cold water mixing control apparatus, and FIG. 4 is a control block diagram, FIG. 4 is a diagram showing an example of a relationship between a temporal change in the mixed hot water temperature and the supplied hot water temperature when the hot water / water mixing control device is stopped;
FIG. 5 is a block diagram of a conventional hot water mixing controller. 12 …… Water side valve, 13 …… Bath side valve, 15 …… First drive means,
17 ... second driving means, 18 ... mixed hot water temperature detecting means, 25 ...
… Temperature gradient detection means, 26 …… Main control means.

Continuation of front page (56) Reference JP-A-60-201173 (JP, A) JP-A-61-153423 (JP, A) JP-A-57-59211 (JP, A) JP-A-58-129511 (JP , A) JP 60-249783 (JP, A) JP 61-109987 (JP, A)

Claims (1)

[Claims] 1. A water side valve for adjusting the amount of water, a hot water valve for adjusting the amount of hot water, a first drive means for urging the water side valve, and a second drive means for urging the hot water valve. A mixed hot water temperature detecting means for detecting the mixed hot water temperature, a water temperature detecting means for detecting the water temperature, a temperature gradient detecting means for detecting a change gradient of the mixed hot water temperature, and a mixed hot water temperature setting means for setting the mixed hot water temperature. And a main control for controlling the mixed hot water temperature by driving the first drive means and the second drive means by using the signals of the mixed hot water temperature detection means, the temperature gradient detection means, and the mixed hot water temperature setting means. A hot water mixing controller for estimating the supplied hot water temperature by a signal from the temperature gradient detecting means when the hot water supply is stopped.