JPH01159546A - Hot/cold water mixing controller - Google Patents

Abstract

PURPOSE:To enable temperature to further rapidly attain a set value by a method wherein the opening of a valve is set to a given value on condition that a rate of a temperature change per a unit time attains a value higher than a specified value. CONSTITUTION:A control device is provided with a hot water cold water mixing valve 3, a drive means 14 to drive the valve 3 so that the opening of the valve is increased to a value responding to a predetermined set temperature Ts, and a control means 10 to control the drive means 14 based on the set temperature Ts and a feed hot water temperature Tm. Further, it is provided with a memory 10a to store the given opening position of the valve 3. The control means 10 effects control so that the valve 3 is moved based on the memory of a given opening position stored in the memory 10a on condition that the rate of a temperature change of the feed hot water temperature Tm exceeds a specified value. This constitution, when a change amount of a feed hot water temperature to a time is increased, enables rapid adjustment of the opening of the valve to a given value during steady operation, and permits increase of a speed at which temperature attains a target value.

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. Controls the opening degree of a hot water mixing valve that adjusts the mixing ratio of water and hot water to reach a set temperature. 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.

(Problem to be Solved by the Invention) In this case, when starting the entire system, that is, when the hot water side is still cold, or at a so-called cold start, or when water is being used elsewhere in the building, the piping When pressure fluctuations occur in the system, fluctuations occur in the supplied hot water temperature. 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 that drives the mixing valve 3 toward a valve opening degree corresponding to a predetermined set temperature Ts; and a driving means 14 that drives the mixing valve 3 toward a valve opening corresponding to a predetermined set temperature Ts;
4, the hot water mixing control device includes a control means 10 for controlling the mixing valve 3, a memory 1 for storing a predetermined opening position of the mixing valve 3;
0a, the control means 10 controls the i-coupling valve 3 to store the predetermined opening position stored in the memory 10a on the condition that the time rate of change of the tapped water temperature T is equal to or higher than a certain value. The movement is controlled based on the .

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 valve opening can be quickly set to the predetermined regular opening. , it is possible to reach the target temperature faster. Further, 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. Note that the same reference numerals in each figure indicate similar 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. means, 9 is an operation button for supplying hot water and stopping water; 10 is a main calculation control means; loa is a position memory for valve opening; 13 is a valve speed calculation means for determining the opening/closing speed of the valve 3; 14 is a valve 3; This is a valve driving means that operates the valve. 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 driven by a drive means 14 such as a motor. I have to.

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, and then rotates the drive shaft in the other direction. When it rotates and reaches the maximum position, the hot water supply channel valve opens to the maximum and closes completely, supplying only high temperature hot water, and at these intermediate positions, each intermediate temperature is given. Become.

The water stop 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. This can also serve as a switching valve for switching the hot water output to multiple hot water outlets such as a flush or shower, or a flow rate 1111 mechanism can be added as needed.

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. The main calculation control means 10 calculates the position that the valve 3 should take in response to the temperature Ts set by the temperature setting means 8, 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 1O 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, 71 temperature data t are loaded into the register 101 based on the clock timing,
Next temperature data T rs , t◆1 at the next timing
By taking in the temperature data and transferring it to another register 102, the temperature data at each successive time t 1 and t+1 can be held in the respective registers 101 and 102. Based on the data in the registers 101 and 102, the temperature data Tta, t-Tm, and t+1 are transferred to the subtractor 1.
By calculating 03, it is possible to detect the temperature change within a predetermined time, that is, the temperature change rate of 61 layers. This temperature change rate ΔT■ is set as the reference value ΔTw of the comparator 104.
For example, the standard value Δτpeng0 is 1℃/se.
If c is selected and a temperature change greater than this is detected, the comparator 104 sets the judgment output ■ to logic l.

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 T fat.
=Ts-T intestine is calculated. This temperature deviation signal ΔT and the judgment output signal ■ of the comparator 104 described above are the condition judgment means 1.
06 is input. If the condition determination means 106 determines that the determination signal I=1 and the temperature deviation signal ΔT is, for example, 5° C. or higher, the gain is increased because the temperature change is rapid and the temperature deviation is large. , determines that the valve opening should be moved to the stored position in the position memory 10a, and generates a command signal J to that effect.

The position memory 10a uses a static memory or the like, and stores the valve opening degree when the hot water temperature is the set temperature and the hot water is being poured regularly, or when the water heater was last stopped in use. The opening position can be written into the memory, for example, when the water heater was last used, or when the water heater is installed.

The valve speed calculation means 13 calculates the valve speed v=K based on the deviation signal ΔT and the command signal J of the main calculation control means 10.
(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 becomes 1, the valve speed calculation means 13 increases the gain to the maximum gain KMAX and operates the valve. Maximize opening/closing speed. 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 this, temperature detection means 6, position detection means 7, temperature setting means 8. and reading the data of the operation button 9 (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 condition determining means 10
From the judgment result J in 6, the temperature change rate is 1°C per unit time.
or the rate of temperature change is 1°C per unit time.
As described above, when the temperature deviation is less than the predetermined value a, the gain K is not changed in the speed calculation means 13. Further, when the temperature change rate is 1° C. or more per unit time and the temperature deviation is more than a predetermined value a, the speed calculation means 13 is instructed to maximize the gain K, that is, K - KNrAx. Speed calculation v = K (Ts
-Tm).

As a result, the mixing valve 3 is predetermined to the position stored in the position memory 10a or to a position shifted by a predetermined position from that position (for example, a position where the hot water side is squeezed by a predetermined amount), and is driven, for example, at the maximum speed (44 ), after this, the hot water supply temperature Tm exceeds the set temperature Ts (46), or the mixing valve 3 remains at a predetermined position corresponding to the set temperature Ts and stored in the memory for a predetermined time t (for example, 5 seconds) or more. (47) and return to normal control (48)
).

Note that the determination routine 43 regarding temperature deviation may be omitted depending on the case.

(Effects of the Invention) According to the present invention, the rate of temperature change per unit time is monitored as in 1 or more, and the valve opening is set to a predetermined opening on the condition that the rate of temperature change is at least a certain value or more. By doing so, it is possible to obtain a hot water mixing control device with good followability that can reach the target temperature more quickly in a stable state without causing hunting.

Further, according to this embodiment, when driving the valve to a predetermined opening position, the driving speed is maximized, so that the above-mentioned effects can be more effectively achieved.

[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 outline of the operation of the hot water mixing control device according to the embodiment of the present invention. FIG. 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, 10a is a position memory, 13 is a valve speed calculation means, and 14 is a valve drive means.

Claims (1)

[Scope of Claims] A hot water mixing valve that can mix and supply hot water and water at a predetermined ratio, and a driving means that drives the mixing valve toward a valve opening corresponding to a predetermined temperature setting. ,
A hot water mixing control device comprising a control means for controlling the driving means based on the set temperature and the hot water tap temperature, further comprising a memory for storing a predetermined opening position of the mixing valve, the control means controlling at least the hot water tap temperature. Hot water mixing characterized by performing control to move the mixing valve based on the memory of the predetermined opening position stored in the memory, on the condition that the time rate of change in temperature is equal to or higher than a certain value. Control device.