JP2529223B2 - 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 control device that mixes high temperature water with water to produce hot water suitable for showering, washing, or filling a bathtub with hot water.

Prior Art FIG. 6 shows an embodiment of a conventional hot and cold water mixing control device.
First, the configuration of the conventional example will be described.

Reference numeral 1 is a water side pipe, and 2 is a hot water side pipe, and a water side valve 3 and a hot water side valve 4 are attached in the middle thereof. Water valve 3
The hot water valve 4 is urged by a drive unit 5 such as a pulse motor. The water side pipe 1 and the hot water side pipe 2 join together to form a mixing portion, which serves as the mixing pipe 7 and is discharged from a currant or a shower. The hot water temperature detecting means 8 is attached in the middle of the mixing pipe 7, and the signal is input to the control device 9.

Next, the operation of the above-mentioned conventional example will be described. This will be described with reference to the flowchart of FIG. First, when the set temperature is set by the controller 9, the water side valve 3 is opened and set at the set position. Next, the hot water valve 4 is opened and mixed. Hot water temperature detection means 8
Sampling input the tap water temperature and compare it with the set temperature.
Here, the hot water discharge temperature and the set hot water temperature are related by the following equation: (new hot water temperature)-(set temperature)> + (tolerance) (new hot water temperature)-(set temperature)>-(tolerance) The opening of the water side valve 3 is adjusted at a speed proportional to the absolute value of the deviation from the set temperature. As a result, if the deviation between the hot water temperature and the set temperature falls within the allowable error range, the operation of the water valve 3 is stopped and the valve opening is fixed.

In this way, at the start of hot water supply, the water side valve 3 is always opened first to the predetermined position, and then the hot water side valve 4 is opened and mixed.

Problems to be solved by the invention: When using a shower, etc., frequent stop and repeat tapping are repeated, but in the conventional example, the water side valve always opens first, and then the hot water side valve opens, so the user is kept at an appropriate temperature for a while. It was very inconvenient and uncomfortable to wait for a while or to take cold water from the beginning.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot and cold water mixing control device that is comfortable and easy to use, and does not generate cold water from the start of hot water supply.

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 first and second biasing the water side valve and the hot water side valve. Driving means, a hot water temperature detecting means for detecting a hot water temperature of the hot water side valve and the hot water side valve forming a mixing portion, a hot water temperature setting means, and a hot water temperature flowing into the hot water side valve. A supply hot water temperature estimating means that is assumed and set in advance, a deviation calculating means that obtains a temperature deviation from the hot water temperature detecting means and the hot water temperature setting means, and only the water side valve is opened in advance to determine the water temperature by the hot water temperature detecting means. A gradient detecting means for detecting a change gradient during measurement, a gradient setting means to be compared with an output value of the gradient detecting means, and whether or not an output value of the gradient detecting means is lower than a setting value of the gradient setting means. Judgment is made, and when the change gradient is lower than the set value and the change gradient becomes less than a predetermined value, it is detected by the hot water temperature detecting means. Comparing means for outputting the water temperature, storage means for storing the water temperature output by the comparing means, mixing ratio calculating means for obtaining a mixing ratio from the supplied hot water temperature estimating means, the hot water temperature setting means and the storage means And a biasing amount computing unit that determines the biasing amounts of the first and second driving units from the mixing ratio computing unit and the deviation computing unit.

Action The hot water valve and hot water valve may be driven with the urging amount of the optimum mixing ratio in order to discharge the hot water of appropriate temperature. Therefore, the supplied hot water temperature is input from the supplied hot water temperature estimating means and the set value is input from the hot water temperature setting means to the mixing ratio calculation means. Further, when the water temperature is measured by the hot water temperature detecting means, the gradient of the water temperature is detected by the gradient detecting means, and the set value of the gradient setting means is compared by the comparing means. As a result, the water temperature detected when it is lower than the set value and the change gradient becomes gentle to the predetermined value or less is stored in the storage means. The stored water temperature is output to the mixing ratio calculation means. Next, the urging amount calculation means corrects the temperature deviation obtained by the deviation calculation means in order to adjust the mixture ratio to the optimum value, determines the urging amount, and outputs it to the first and second driving means.

When the water temperature is measured in this way, it is judged from the change gradient of the water temperature that the water stays for a long time or that the water whose temperature has risen due to solar radiation etc. exhausts. As a result, the water temperature can be measured accurately, and the mixing ratio can be calculated accurately. As a result, there is little change in the hot water temperature when the hot water is stopped or when the hot water is re-opened, and it can be used comfortably when taking a shower or the like.

Embodiment FIG. 1 shows a hot and cold water mixing controller of the present invention. First, the configuration of the present invention will be described. 1 is water side piping, 2 is hot water side piping, 3
Is a water side valve, and 4 is a hot water side valve. 10 is the first drive means 11
The water side valve 3 is driven via the motion conversion part of the above. A second drive means 12 drives the hot water side valve 4 via the motion conversion portion 13. 8
Detects the water temperature or the mixed hot water temperature by the hot water temperature detecting means. 9
Is connected to the hot water temperature detecting means 8, the flow rate detecting means 14, the hot water temperature setting means 15, and the flow rate setting means 16 by the control device, and outputs the urging amount to the first and second driving means 10, 12.

FIG. 2 shows an embodiment of the control device 9. Reference numeral 16 is a supply hot water temperature estimating means, the output portion of which is connected to the mix temperature calculating means 17 together with the hot water temperature setting means 15. Reference numeral 18 denotes a gradient detecting means to which the output portion of the hot water temperature detecting means 8 is input, and further the gradient setting means 19 and the output portion are connected to the comparing means 20 first. The output unit of the comparison unit 20 is connected to the storage unit 21, and the output unit of the storage unit 21 is connected to the mixing ratio calculation unit 17. The output parts of the hot water temperature detecting means 8 and the hot water temperature setting means 15 are branched and input to the deviation calculating means 22. Its output section is 23 along with the output of the mixing ratio calculation means 17.
Is connected to the urging amount calculation means. The output of the biasing amount calculation means 23 is branched and connected to the first and second driving means 10 and 12.

Next, the operation of the configuration of the present invention will be described. A user operates the hot water temperature setting means 15 and the flow rate setting means 16 to take a shower or the like. In order to discharge the hot water having the set temperature, it is necessary to set the urging amount ratio of the water side valve 3 and the hot water side valve 4 to the mixing ratio. Therefore, the supplied hot water temperature is input from the supplied hot water temperature estimating means 16 and the set temperature is input from the hot water temperature setting means 15 to the mixing ratio calculating means 17. Further, the water temperature is measured by the hot water temperature detecting means 8,
Obtain the gradient of change from the water temperature sampled last time. It is determined whether or not the change gradient is smaller than the set value of the gradient setting means 19. When the comparison means 20 determines that the water temperature is low, the water temperature is output to the storage means 21 and stored therein. The water temperature stored here is output to the mixing ratio calculation means 17, and the mixing ratio is calculated from the presumed supply hot water temperature and the set hot water temperature. The mixing ratio of the amount of water and the amount of hot water is given by (supply hot water temperature-set temperature) / (set temperature-water temperature). The urging amount calculating means 23 first determines the urging amounts of the first and second driving means 10 and 12 from the obtained mixing ratio, and opens the water valve 3 and the hot water valve 4. When you start tapping, correct the mixing ratio by temperature deviation to maintain the set temperature.
It outputs to the first and second driving means 10 and 12.

The operation at the time of measuring the water temperature is shown in the flowchart of FIG.
If you do not have water temperature detection completed, the process goes to P _2. At this time, the water temperature cannot be accurately measured when it is not used for a long time or when the water temperature of the water side pipe 1 is high due to sunlight or the like.
FIG. 4 is a diagram showing changes in the water temperature when the water side valve 3 is opened to measure the water temperature. Therefore, in the flowchart of FIG.
As shown by P ₃ and P ₄ , it is checked whether or not the water temperature change gradient obtained by the gradient detecting means 18 has become gentle. If it becomes gentle, it is determined that warmed water has been discharged, and the measured water temperature is input to the storage means 21.

By accurately measuring the water temperature in this way, when the appropriate temperature hot water is discharged, the mixing ratio used for determining the energizing amounts of the water side valve 3 and the hot water side valve 4 can be accurately obtained. As a result, as shown in FIG. 6, the performance at the time of stopping hot water supply and at the start of hot water discharge was significantly improved.

EFFECTS OF THE INVENTION As described above, according to the hot and cold water mixing control device of the present invention, the water side valve for adjusting the water amount and the hot water amount, the hot water side valve, and the first and second biasing the water side valve and the hot water side valve. Driving means, hot water temperature detecting means for detecting hot water temperature mixed hot water, hot water temperature setting means,
A supply hot water temperature estimating means set in advance assuming the supply hot water temperature;
Only the water side valve is opened in advance, a gradient detecting means for detecting a changing gradient when measuring the water temperature by the hot water temperature detecting means, a gradient setting means to be compared with an output value of the gradient detecting means, and an output of the gradient detecting means. It is determined whether or not the value is lower than the set value of the gradient setting means, and when the change gradient is lower than the set value and the change gradient becomes less than a predetermined value, the comparing means for outputting the water temperature detected by the hot water temperature detecting means and the comparing means Storage means for storing the output value of the means, mixing ratio calculating means for obtaining the mixing ratio from the supply hot water temperature estimating means, the hot water temperature setting means and the storage means, and the mixing ratio for the output value of the deviation calculating means. In order to set the urging amount of the water side valve and the hot water side valve at the optimum mixing ratio when the user uses hot water with a suitable temperature, the water temperature measurement The gradient of water temperature is detected at By measuring the water temperature when the gradient becomes less than a certain value and then calculating the mixing ratio with this value, hot water without large overshoot or undershoot can be supplied at the time when the hot water is stopped or when the hot water starts to be supplied, which is extremely convenient. It has a good safety effect.

[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, FIG. 2 is a control block diagram of the same apparatus, FIG. 3 is a control flowchart of the apparatus, and FIG. 4 is a water temperature at the time of detecting water temperature. FIG. 5 is a change diagram, FIG. 5 is a performance diagram when the hot water supply is stopped and started by the same device, and FIGS. 6A and 6B are performance diagrams of the conventional hot and cold water mixing tap when the hot water supply is stopped and when the hot water supply is started. FIG. 7 is the same flowchart. 3 ... water side valve, 4 ... hot water side valve, 6 ... first driving means,
8 ... Second drive means, 10 ... Hot water temperature detecting means, 13 ... Hot water temperature setting means, 15 ... Supply hot water temperature estimating means, 16 ... Mixing ratio calculating means, 17 ... Gradient detecting means, 18 ... Slope setting means,
19 ... Comparison means, 20 ... storage means, 21 ... deviation calculation means, 22 ... biasing amount calculation means.

Claims (1)

(57) [Claims] 1. A water side valve for adjusting the amount of water, a water side valve for adjusting the amount of hot water, a first drive means for urging the water side valve, and a second drive for urging the water side valve. Means, a water-side pipe having the water-side valve and a hot-water valve attached, and a hot-water pipe merge further downstream to form a mixing part, and a hot-water temperature detecting means for detecting the hot-water temperature of the mixing part; A hot water temperature setting means for setting the hot water temperature, a hot water supply temperature estimating means for setting a hot water supply temperature flowing into the hot water side valve in advance, a hot water temperature detecting means, and a hot water temperature setting means for obtaining a temperature deviation. Deviation calculating means, gradient detecting means for detecting only a changing gradient when water temperature is previously measured by the hot water temperature detecting means, gradient setting means to be compared with an output value of the gradient detecting means, and the gradient It is determined whether the output value of the detection means is lower than the set value of the gradient setting means, and if it is lower than the set value, the change There storage means for storing the comparison means and the outputted temperature from the comparison means for outputting a temperature detected by said water temperature detecting means becomes gentle until less than a predetermined value,
Mixing ratio calculating means for obtaining a mixing ratio from the supply hot water temperature estimating means, the hot water temperature setting means, and the storing means, and the mixing ratio obtained by the mixing ratio calculating means is corrected by the temperature ratio obtained by the deviation calculating means. A hot and cold water mixing control device comprising an urging amount calculation means for determining the urging amounts of the first and second driving means.