JPH0556529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water mixing device for supplying hot water at a set temperature by controlling the mixing ratio of hot water and water.

(Prior art) Conventionally, a mixing valve that adjusts the mixing ratio of hot water and water,
A drive device that drives the mixing valve, a temperature detector that detects the mixed water temperature, a temperature setting device that sets the mixing water temperature, and a signal of the mixing valve opening corresponding to the set temperature set by the temperature setting device. A hot water mixing device equipped with a drive control circuit that controls the drive device based on the temperature difference between the set temperature and the mixed water temperature is known from Japanese Patent Application Laid-open No. 72527/1983.

(Problem to be solved by the invention) In the above conventional example, when changing the setting value of the temperature setting device,
At the start of hot water supply, the mixing valve is driven in advance to an opening corresponding to the set temperature, and then the opening is corrected according to the temperature deviation between the set temperature and the mixed water temperature, so there are the following problems. . In other words, each time the temperature set value is changed during hot water supply, the mixing valve is first controlled to the opening degree determined in advance for the set temperature, and then corrected based on the temperature deviation, so the set value It took a long time for the temperature of the hot water to stabilize, and therefore the hot water characteristics were poor.

(Means for solving the problems) The present invention aims to solve the above problems,
To this end, the present invention provides a mixing valve that adjusts the mixing ratio of hot water and water, a drive device that drives the mixing valve, a temperature setting device that sets the temperature of the mixed water, and a temperature detector that detects the temperature of the mixed water. , a mixing valve opening detector, an opening setting means for setting the mixing valve opening based on the installed temperature of the temperature setting device, and correcting the mixing valve opening based on the signal deviation between the temperature setting device and the temperature detector. an opening correction means;
The structure includes a biasing amount setting means for setting the drive amount of the drive device based on the deviation between the added output of the opening degree setting means and the opening degree correction means and the opening degree detection force.

(Operation) In the present invention, it is assumed that the set temperature is changed in a state where the mixed water temperature has converged to a certain set temperature.
When the set temperature is changed, a correction opening signal based on the temperature deviation between the set temperature after the change and the mixed water temperature at the time of the change is added to the signal of the mixing valve opening corresponding to the set temperature after the change. Using this additional output as a target value, the drive amount of the drive device is set based on the deviation from the opening detection force of the mixing valve, and the drive device is driven with the set drive amount, and the mixing valve is driven in the direction to converge to the changed set temperature. Therefore, since the temperature deviation is large when the set temperature is initially changed, the correction opening signal is large, and the above addition output is a large value compared to the output of only the mixing valve opening signal corresponding to the set temperature after the change. Therefore, the driving speed of the drive device is faster than in the conventional example, and the control of the mixing valve is performed more quickly than in the conventional example.

(Embodiment) FIG. 1 is a vertical sectional view of a main part showing an embodiment of the present invention, FIG. 2 is an electric circuit diagram in the same example, and FIG. 3 is a control flowchart.

In FIG. 1, reference numeral 1 denotes a hot water mixing device, which includes a mixing valve 4 that controls the opening degree of the hot water side valve port 2 and the water side valve port 3 to increase or decrease inversely, and a mixing flow path 5.
The mixing valve 4 and the temperature sensing element 6 are connected to each other via a shaft 7. A drive device 8 such as a servo motor that is driven by
and an opening detector 9 such as a potentiometer that detects the opening of the mixing valve 4. 10 is a pilot valve-type water electromagnetic type provided downstream of the hot water mixing device 1, 11 is a water flow rate detector, and 12 is a closed type water flow control valve, which controls the difference between the water flow rate detected by the water flow detector 11 and the set water flow rate. Based on the deviation, the opening degree is controlled by a driving means 13 such as a servo motor. The hot water side valve port 2 is connected via a check valve 16 to a hot water outlet path 15 of an instantaneous water heater 14 whose hot water temperature is controlled to a constant high temperature, and the water side valve port 3 is connected to a check valve 17. It is connected to the water supply waterway 18 via. 20 is a temperature detector that detects the temperature of the mixed water.

Next, in Fig. 2, reference numeral 21 is a temperature setting device for setting the temperature of the mixed water, and the characteristic of the mixing valve opening degree and the mixing water temperature, which are preset based on the set temperature (TS) of the temperature setting device 21, is The opening setting means 22 outputs the opening signal DFF of the mixing valve 4, and the deviation output (TS) from the deviation detecting means 23 receives both signals (TS) and (TM) from the temperature setting device 21 and temperature detector 20. −
TM), an opening correction means 24 outputs a correction signal DP+DI, and a target opening setting means 2 adds the outputs of both the opening setting means 22 and the opening correction means 24.
5. Opening deviation detecting means 26 which compares the set output of the target opening setting means 25 and the opening detection force of the opening detector 9; The biasing amount setting means 27 sets the driving amount. Incidentally, the above-mentioned opening degree correction means 2
The correction signal in step 4 is the sum of the proportional element DP = KP (TS - TM) and the integral element DI = KI∫ (TS - TM) dt (where TM is the mixed water temperature, KP is the proportional constant, and KI is the integral constant ), and in particular, the integral element is the absolute value of the above deviation |ε|(=|TS−TM
When |) is smaller than the first setting value (ε1), the above equation is integrated, and when |ε| is larger than the first setting value (ε1) and smaller than the second setting value (ε2). The above formula (TS
-TM) is integrated as (TS-TM)/A (where A>1), and the integration is not performed when |ε| is larger than the second set value (ε2).

The operation of the above configuration will be explained based on FIG. 3. When the mixed water temperature is set using the temperature setting device 21 and the hot water supply switch (not shown) is operated, the water solenoid valve 1
0 is opened and hot water supply starts. With the start of hot water supply, the opening degree setting means 22 outputs the opening degree signal DFF based on the set temperature (TS), and
The deviation detection means 23 outputs the deviation between the set temperature (TS) and the mixed water temperature (TM) detected by the temperature detector 20, and first, the calculation of the proportional element DP reaches the maximum,
The calculation of the integral element DI is performed with the minimum value limited, and as mentioned above, depending on the size of the deviation, the calculation of the integral element DI is
The minimum value is limited, and the target opening setting means 25 sets the opening signal DFF and the proportional element DP.
and each signal of the integral element DI are added, and the added output is input to the opening degree deviation detection means 26, and the driving amount of the drive device 8 is determined using this added output as a target value according to the deviation from the opening degree detection force. is calculated by the energizing amount calculation means 27, and the mixing valve 4 is controlled by the driving device 8 to a position where mixed hot water at a set temperature is obtained.

Also, when the set value of the temperature setting device 21 is changed during hot water supply, the opening signal corresponding to the changed set temperature is
The target opening degree is set by adding DFF and the correction signal DP + DI, and the mixing valve 4 when changing the set value
control will also be carried out quickly.

That is, assuming that the opening signal DFF of the mixing valve 4 is 1.2V when the set temperature is 40°C, and the opening signal DFF is 1.5V when the set temperature is 45°C, the set temperature is
After setting the hot water to 40℃, change the set temperature to 45℃.
We will specifically explain the case of changing to .

When the set temperature is changed to 45℃, the opening signal DFF
= 1.5V signal is obtained, temperature deviation (45℃-40℃)
Assuming that the opening correction signal DP + PI based on DP＋
DI) - Current value (opening detection force) = 1.5V + 0.05V -
1.21V=0.34V, and the mixing valve 4 is driven earlier by the opening correction signal DP+DI compared to the conventional example when the set temperature is changed.

In this embodiment, the integral element DI is calculated as shown in the flowchart of Fig. 4, but the reason for this is that if the deviation |ε| This is considered to be the cold water discharge stage at the start of combustion in the boiler 14, and performing integral addition in such a case would require a long time until the water temperature stabilizes at the set temperature, and the deviation |ε| If it is smaller than the second set value ε2 and larger than the first set value ε1, it is a transition stage to a steady state, so the amount of integral addition is slightly decreased compared to the steady state convergence stage when it is smaller than the first set value ε1. This is intended to improve the rate of change in the opening degree of the mixing valve 4 and the convergence of the mixed water temperature.
Also, the calculation of the integral element DI described above is performed using the instantaneous water heater 14.
This calculation is effective at the start of hot water dispensing, and if this calculation is also performed when changing the set value of the temperature setting device 21 during hot water supply, it will take a long time for the mixed hot water temperature to converge. Therefore, in this embodiment, the temperature detected by the temperature detector 9 is determined at the beginning of the calculation, and if the detected temperature is, for example, 25°C or higher, it is assumed that the mixed water temperature is in the convergence range regardless of the magnitude of the deviation |ε|. The deviation is integrated and added as is.

(Effects of the Invention) As explained in the above embodiments, according to the present invention, the responsiveness of the mixing valve is better than in the conventional example, and the hot water output characteristic allows hot water at the set temperature to be obtained in a relatively short time. We can provide a good hot water mixing device.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a main part, FIG. 2 is an electric circuit diagram, FIG. 3 is a control flowchart, and FIG. 4 is a flowchart of integral calculation. 4... Mixing valve, 8... Drive device, 9... Opening degree detector, 20... Temperature detector, 21... Temperature setter, 22... Opening degree setting means, 24... Opening degree correction means, 27... energizing amount setting means.

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 temperature setting device that sets the mixed water temperature, and a temperature detector that detects the mixed water temperature.
A mixing valve opening detector, an opening setting means for setting the mixing valve opening based on the set temperature of the temperature setting device, and an opening setting means for correcting the mixing valve opening based on the signal deviation between the temperature setting device and the temperature detector. and an energizing amount setting means for setting the drive amount of the drive device based on the change in the addition output of the opening setting means and the opening correction means and the opening detection output. Hot water mixing device.