JPH01127820A - Hot and cold water mixing control device - Google Patents

Abstract

PURPOSE:To make it possible to bring the temperature of hot water to a set temperature fast without developing inconvenience such as hunting, etc., by providing a main calculation control device which increases the gain in a valve speed calculator when the rate of change in time of the temperature of the discharged hot water exceeds a constant value. CONSTITUTION:A main calculation control device 10 is provided with a deviation calculation device 105, which always calculates the deviation DELTAT between a set temperature Ts and the temperature of supply Tm. This temperature deviation signal, DELTAT and the judgement output signal I of a comparator 104 are inputted to a condition judgement device 106. With this condition judgement device 106, if the judgement signal I=1 and the temperature deviation signal DELTAT is judged to be, for instance, at least 5 deg.C, it is judged that the gain should be increased because the temperature difference is rapid and the temperature deviation is large and an instruction signal J for this judgement is issued. A valve speed calculation device 13 calculates the valve speed v=K(Ts-Tm) based on the deviation signal DELTAT of me main calculation control device 10 and the instruction signal J.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a hot water mixing device that supplies hot water from a boiler or the like that mixes water and hot water at a predetermined ratio, and particularly relates to a hot water mixing device that supplies hot water to a predetermined temperature. This invention relates to a hot water mixing control device that automatically reaches the desired temperature.

(Prior art) In this type of hot water mixing control device, the supplied hot water temperature is determined by comparing the set hot water temperature (set hot water temperature) Ts and the currently supplied hot water temperature (supplied hot water temperature) Tm. The opening degree of the hot water mixing valve is controlled to adjust the mixing ratio of water and hot water by m so that the set temperature is reached. In this case, the opening/closing speed V of the hot water mixing valve
is given as an empirically determined function of temperature, for example, v=K(Ts-Tm). Here, K is a constant called gain. Selection of the gain is important because the opening/closing speed of such a valve affects the temperature fluctuation of the supplied hot water. In conventional hot water mixing control devices, this gain is set to one specific value.

(Problems to be Solved by the Invention) In this case, if pressure fluctuations in the piping system occur due to water being used elsewhere in the building, the temperature of the supplied hot water will fluctuate. The valve is driven to follow this fluctuation and return the supplied water temperature to the set temperature, but since the aforementioned gain is limited to one, due to the value of this gain, until the set temperature is reached. time becomes longer. Alternatively, problems such as hunting may occur and the target temperature may not be reached.

Therefore, an object of the present invention is to provide a hot water mixing control device with good responsiveness that can reach a set temperature more quickly without causing problems such as hunting.

(Means and effects for solving the problem) In order to solve this problem, the present invention provides a hot water mixing valve 3 that can mix and supply hot water and cold water at a predetermined ratio, and A driving means 14 for driving the mixing valve 3 toward a valve opening corresponding to a predetermined set temperature, and a valve speed calculation means 13 for determining a valve opening/closing speed based on the deviation between the set temperature and the hot water temperature. The hot water mixing control device is provided with a main calculation control means 10 that increases the gain of the valve speed calculation means 13 when the temporal change in the hot water temperature is equal to or higher than a certain value.

Further, the main calculation control means 10 increases the gain of the valve speed calculation means 13 when the deviation between the set temperature and the tapped water temperature is equal to or higher than a certain value.

With this configuration, when the amount of change in the supplied hot water temperature with respect to time increases, that is, when a large fluctuation occurs in the supplied hot water temperature, the gain can be increased to speed up the attainment of the target temperature. In other cases, control can be performed according to normal control conditions.

(Embodiments of the Invention) The present invention will be described in detail below with reference to the accompanying drawings. In each drawing, the same reference numerals indicate the same objects.

FIG. 1 is a system diagram of a hot water mixing control device according to an embodiment of the present invention. In the figure, 1 is a pipe that supplies water, 2
3 is a pipe that supplies high-temperature hot water from a water heater (not shown), etc., and 3 is each pipe l.

2 is a hot water mixing valve that opens and closes by interlocking the valves 3a and 3b installed at 2, 4 is a mixing pipe downstream of valve 3, 5 is a water stop valve for supplying hot water from a callan, etc., and 6 is a water flowing through mixing pipe 4. Temperature detection means for detecting the temperature of hot water and converting it into an electric signal; 7 is a position detection means for detecting the opening/closing position of the hot water mixing valve 3; 8 is a temperature setting for setting the desired temperature to be obtained with the ring. 9 is an operation button for supplying hot water and shutting off water; 10 is a main calculation control means; 13 is a valve speed calculation means for determining the opening/closing speed of the valve 3; and 14 is a valve drive means for operating the valve 3. The main components of these components will be further explained below.

The hot water mixing valve 3 is a well-known one, in which a valve for opening and closing the water supply channel and a valve for opening and closing the hot water supply channel are connected by one drive shaft, and this drive shaft is connected to a drive means 14 such as a motor.
For example, when the drive shaft is rotated in one direction and reaches the maximum position, the water supply valve opens to the maximum and the hot water supply path valve closes completely, supplying only water. Also, when the drive shaft is rotated in the other direction and reaches the maximum position, the hot water supply channel valve opens to the maximum and closes completely, leaving only high temperature hot water to be supplied.
At these intermediate positions, respective intermediate temperatures will be given.

The water cut-off valve 5 is, for example, an electromagnetic valve that opens and closes in response to the operation button 9, and is used to supply or stop mixed hot water, and can be switched to multiple hot water tap lights such as flush and shower lights as necessary. It is also possible to serve as a valve or add a flow rate adjustment mechanism.

The temperature detection means 6 includes a temperature sensor such as a thermistor in the pipe 4 and converts the temperature into an electrical signal, and is a zero position detection means that may include a preamplifier to obtain the voltage necessary for subsequent processing. Reference numeral 7 is directly connected to or interlocks with the drive shaft of the mixing valve 3, and detects the open/close position of the valve in response to the rotation of the drive shaft.For example, a rotary potentiometer can be used; A voltage signal corresponding to the position can be obtained. The temperature setting means 8 is
This is to preset the temperature of the hot water to be obtained from a valve downstream of the water stop valve 5, for example, from 20°C to
A voltage signal or data signal corresponding to 45° C. can be provided. In response to the temperature Ts set by the temperature setting means 8, the main calculation control means lO calculates the position that the valve 3 should take, and determines whether the valve 3 has reached a predetermined position based on the signal p from the position detection means 7. I'll monitor what's going on. The operation button 9 commands the opening and closing of the water stop valve 5, and also supplies information on water supply or water stop to the main calculation control means IO.

The main calculation control means 10 operates at a predetermined clock timing based on signals from the temperature detection means 6, the position detection means 7, the temperature setting means 8, and the operation button 9.
For example, it can be configured with a microcomputer. Such a main calculation control means lO is as shown in FIG. 2, for example. That is, the temperature data Tpeng,t is loaded into the register 101 based on the clock timing,
By taking in the next temperature data T, t+1 at the next timing and transferring it to another register 102, the temperature data at each successive time 1.1+1 can be held in the respective registers 101, 102. can.

By calculating the temperature data Tm, t-T, 1+1 using the difference calculator 103 based on the data in the registers 101 and 102, it is possible to detect a temperature change within a predetermined time, that is, a temperature change rate ΔTm. Comparing such a rate of temperature change ΔTm with a reference value ΔTmo of the comparator 104,
For example, l"0/sec is selected as the reference value ΔT■0 for determining whether the temperature change per unit time is sudden, and if a temperature change greater than this is detected, the comparator 104
sets the judgment output I to logic 1.

On the other hand, the main calculation control means 10 is equipped with a deviation calculation means 105, and always has a deviation ΔT between the set temperature Ts and the supply temperature Tm.
=Ts-Tm is calculated. This temperature deviation signal ΔT and the judgment output signal of the above-mentioned comparator 104 are connected to the condition judgment means 1.
06 is input. If the condition determination means 106 determines that the determination signal I=1 and the six temperature deviation signals are, for example, 5° C. or higher, the gain is increased because the temperature change is rapid and the temperature deviation is large. It is determined that it should be done, and a command signal J to that effect is generated.

The valve speed calculation means 13 calculates the valve speed v=K(
Ts-Tm) is calculated. That is, the valve speed calculation means 13 calculates the speed using a gain KO that gives a relatively gentle speed while J=0, but when J=1, the valve speed calculation means 13 increases the gain to Kl to increase the valve opening/closing speed. increase

The valve driving means 14 is applied with this speed V, that is, a voltage corresponding to this speed.

Next, the operation of this embodiment will be explained, although it is almost clear from the above description. FIG. 3 shows an outline of the entire operation, and FIG. 4 is a flowchart showing details of the main part thereof. First of all,
When the system boots (30), initialization is performed (31), such as clearing registers or providing necessary initial values.

After that, data of the temperature detection means 6, position detection means 7, temperature setting means 8, and operation button 9 is read (32);
Next, the rate of change over time of the supply temperature Tm is calculated as explained in FIG. 2 (33, 42), but in order to execute this calculation after confirming that it is a cold start, a flag is After calculating the rate of temperature change (33, 42), calculate the temperature deviation (34°43), then determine the rate of temperature change (35°42), and determine the amount of temperature deviation (36, 43), the valve opening/closing speed is calculated (37), that is, the 1-condition determining means 10
From the judgment result J in 8, the temperature change rate is 1°C per unit time.
or the rate of temperature change is 1°C per unit time.
However, if the temperature deviation is less than the predetermined value a, the speed calculation means 13 is commanded not to change the gain K, that is, to calculate the speed with 'K = K O (44), , when the temperature change rate is 1° C. or more per unit time and the temperature deviation is less than a predetermined value a, the speed calculation means 13 is instructed to change the gain K,
In other words, instruct = to calculate the speed with 1 (44),
The valve speed calculating means 13 calculates the opening/closing speed based on this result, and drives the mixing valve 3 at a normal relatively slow speed in the former case, and at a relatively fast speed in the latter case.

Note that the gain may be a variable with the temperature change rate as a parameter.

FIG. 5 shows another embodiment of the present invention, and the conditions for determining the temperature deviation in FIG. 4 are omitted. Specifically, the condition determination means 106 in FIG. 2 does not perform determination regarding temperature deviation.

(Effect of the invention) According to the invention, as described above, by monitoring the temperature change rate per unit time and changing the gain that determines the valve opening/closing speed, the target can be maintained in a stable state without causing hunting. It is possible to obtain a hot water mixing control device with good followability that can reach the temperature faster.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a hot water mixing control device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of main parts of a hot water mixing control device according to an embodiment of this invention, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a flowchart for explaining the operation of the main part of the hot water mixing control device according to the embodiment of the present invention, and FIG. It is a flow chart for explaining operation of a hot water mixing control device concerning other examples. In the drawing, 1 is a water supply pipe, and 2 is a hot water supply pipe. 3 is a hot water mixing valve, 4 is a mixing pipe, 5 is a water stop valve,
6 is a temperature detection means, 7 is a position detection means, 8 is a temperature setting means, 9 is an operation button, 10 is a main calculation control means, 13 is a valve speed calculation means, and 14 is a valve driving means.

Claims (2)

[Claims] (1) A hot water mixing valve that can mix and supply hot water and water at a predetermined ratio, a driving means that drives this mixing valve toward a valve opening corresponding to a predetermined set temperature, and the setting In a hot water mixing control device comprising a valve speed calculation means for determining a valve opening/closing speed based on a deviation between a temperature and a hot water outlet temperature, when the time rate of change of the hot water tap temperature is equal to or higher than a certain value, the valve speed calculation means A hot water mixing control device comprising a main calculation control means for increasing a gain. (2) In the apparatus according to claim 1, the main calculation control means increases the gain of the valve speed calculation means when the deviation between the set temperature and the hot water temperature is a certain value or more. A hot water mixing control device characterized by comprising means.