JPS6389909A - Hot water and water mixing device - Google Patents

Abstract

PURPOSE:To supply hot water close to a set temperature quickly by storing the position of opening of a mixing valve once by a hot water supply stop command, and shifting the mixing valve quickly to the stored opening if set temperature is higher than previous time when making again. CONSTITUTION:When the hot water supply switch of a driving switch 7 is made on, temperature reading is executed from a memory 10, as a valve control judging means 9 stores hot water supply temperature To in a temperature memory 10 by previous hot water supply stop operation. A set temperature Ts of a temperature setting means 8 on the operation panel is read and compared with temperature of previous time To. When temperature Ts is higher than To, there is no fear of overshoot, and accordingly, a valve speed operating means 12 and a valve driving means 13 are actuated to shift to the valve position stored in a positional memory 11. It is checked at a fixed period whether the opening of a mixing valve 1 arrived at the stored position of the memory 11, and the valve control means 9 is operated until arrives at relevant opening.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water mixing device that attempts to obtain hot water at a desired temperature by appropriately adjusting the amount of hot water supplied and the amount of supplied water, and particularly relates to Regarding improvement.

(Prior Art) By adjusting the amount of hot water passing through the mixing valve and the amount of water passing through the water valve, you can obtain hot water at the desired temperature! Well,
Hot water mixing devices are well known. Among these types of hot water mixing devices, there is one in which a first stop valve is activated by a switch on an operation panel or the like to command hot water supply and hot water supply stop. In this case, when the hot water supply is stopped F, the mixing valve automatically returns to the reset position or neutral position, which is an intermediate position between the hot water side fully open position and the hot water side fully closed position, or the hot water side fully closed position, and then restarts. When there is a hot water supply command, temperature control is started from this position.

(Problem to be Solved by the Invention) However, according to such a method, the hot water supply stop 1-command returns the hot water supply to the reset position or the hot water side fully closed position without any judgment. Control had to be started from the closed position, resulting in poor control efficiency. In addition, since temperature control is executed from the beginning of hot water reheating, if the hot water temperature near hot water supply port 4 = J (near the temperature detector) has decreased when the hot water is stopped, an overshoot phenomenon occurs in which the hot water temperature becomes abnormally high. It took a long time to reach stable temperature control.

Therefore, an object of the present invention is to provide a hot water mixing device that can perform efficient control even when hot water is resupplied after hot water supply is stopped.

(Means and effects for solving the problem) In order to achieve this object, according to the present invention, a hot water supply valve (la) that can adjust the hot water performance from the water supply 7gja and a water supply valve (1b ), a mixing valve (1) for mixing these hot water and water, a temperature detector (4) for detecting the temperature of the hot water mixed by this mixing valve (1), and a an operating means capable of setting the desired hot water supply temperature obtained by
7), (8), and a control unit (9) that controls the mixing valve (1) to adjust the hot water temperature to the set temperature of the operating means (8) based on the output of the temperature detector (4).
) to (13), and the control unit (9) to
(13) includes memories (10) and (11) that store the mixing valve opening degree and hot water temperature at the time of stopping the hot water supply based on the hot water supply stop command from the operating means (7); and the mixing valve (1). Valve control determining means (9) for shifting to a predetermined opening degree, and this valve control determining means (9) determines the new set temperature (Ts) when hot water supply is commanded again by the operating means (7). The new set temperature (T) is compared with the hot water temperature (To) stored in the memory (lO).
s) is higher than the hot water temperature stored in the memory (lO), the mixing valve (1) is
1), and if the new set temperature (Ts) is lower than the hot water supply temperature (TO) stored in the memory (10), the memory (1'0)
, (11) are reset. Here, "new" includes the case where there is no setting change.

With this configuration, it is possible to reach the position recorded in the memory quickly, and the water temperature does not become abnormally high (overshoot), allowing efficient and optimal control. .

(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 device according to an embodiment of the present invention. In the figure, (1) is a mixing valve that adjusts the opening position of the hot water supply valve (la) and the water supply valve (lb) by interlocking the hot water supply valve (la) and the water supply valve (lb) with a motor or the like or by driving the respective valves to obtain the desired hot water temperature; 2) is the mixing valve (
(1) is a mixing pipe that sends out the mixed hot water; (3) is a stop valve (3) that automatically opens and closes to supply hot water at a desired temperature;
(4) is a temperature detection means such as a thermistor installed in the middle of the mixing pipe (2), and (5) is a limit switch that detects the low temperature position, that is, the position where the hot water supply valve (LA) is fully closed. The fully closed position detection means (6) is a step motor (6) that detects the opening position of the mixing valve (1).
(7) is a drive switch having a hot water supply switch and a hot water supply stop F switch provided on an operation panel (not shown); (8) is a position detection means such as a mixing valve (1) which also serves as a drive motor; (8) is a desired hot water supply point; Temperature setting means (9) to (13) for setting the temperature are components of the control unit, such as valve control determining means, temperature memory, position memory, valve speed calculating means, and valve driving means, respectively. These configurations will be explained below, focusing on the control unit.

The valve control determination means (9) firstly determines whether the drive switch (
The output signals of the temperature detection means (4) and the temperature setting means (8) are compared based on the hot water supply command (7), and the hot water supply temperature (TO) is controlled to approach the set temperature (Ts). ) The hot water supply is stopped by the hot water supply stop command. Also,
Second, temperature memory (lO) and position memory (11)
Temperature control is performed using the data and the output signal of the fully closed position detection means (5). That is, when there is a cycle of hot water supply → stop → hot water supply, the temperature (TO) at the time of the previous hot water supply stop F stored in the temperature memory (10) is compared with the set temperature (Ts), and the set temperature (Ts) is determined. If is higher than the previous hot water supply temperature (To), control is executed using the previous valve position stored in the position memory (11) as the target value, and if the set temperature (Ts) is lower than the previous hot water supply temperature (To), reset is performed. signal(
R) to reset the contents of the position memory (11).
/ )do.

The temperature memory (lO) uses the stop command of the drive switch (7) as a set signal (Sl) to record the hot water temperature (
TO) is read from the temperature sensor (4).

The contents of this temperature memory (10) are read out by a command signal from the valve control determining means (8) itself. Temperature memory (10
) is updated every time a set signal (Sl), which is a command to stop the drive switch (7), is input.

The position memory (11) uses the stop command of the drive switch (7) as a set signal (S2) to read the opening position of the mixing valve (1) at the time of hot water supply from the position detector (6). The contents of this position memory (11) are read out by a command signal from the valve control determining means (9) itself. The stored contents of the position memory (11) are cleared by a reset signal (R) generated when the valve control determining means (θ) determines that the set temperature (Ts) is lower than the previously stored temperature (TO).

The valve speed calculation means (12) includes a valve control determination means (
8) The opening/closing speed of the valve is calculated based on the type of output signal. For example, in the first control described above, the normal IJN close QJI 01 is executed, and in the second control, a command is given to move at the maximum speed to the valve position stored in the position memory (11). Such a valve speed calculating means (12) can be configured, for example, by a table memory storing various valve opening/closing speed patterns, and uses a part of the output signal of the valve control determining means (9) as an address signal. The opening/closing speed signal can be read out.

The valve driving means (13) is a valve control determining means (9).
The control method is for forming a drive signal for controlling the opening and closing of the mixing valve (1) according to the control method determined by the valve speed calculation means (12) and the calculation speed determined by the valve speed calculation means (12), for example, a signal for determining the rotation direction of the motor. and forms PWM signals for motor control.

The operation of this embodiment will be described below with reference to the flowchart in FIG. In addition, in the following explanation, (20) to (3
The number 0) corresponds to each block number in the flowchart. Further, codes such as (21Y) and (21N) indicate that the judgment of the judgment block (21) is positive and negative, respectively.

When the hot water supply switch of the drive switch (7) is turned on (20), the valve control determination means (
9) stores the hot water temperature (To) in the temperature memory (10), so it reads the temperature from this temperature memory (10) and also reads the set temperature (Ts) of the temperature setting means (8) on the operation panel. ) and compares whether the set temperature (Ts) is higher than the previous hot water supply temperature (To) (Ts≧To) (21). At this stage, generally the mixing valve (1)
is in the reset position. Here, if the set temperature (Ts) is higher than the previous hot water supply temperature (To), (21Y),
Position memory (11) so you don't have to worry about overshoot.
The valve speed calculating means (12) and the valve driving means (13) are operated so that the valve moves at full speed to the stored valve position (22). At this stage, a subroutine for checking whether the mixing valve (1) is operating normally is executed (23), but since the contents of this subroutine are well-known, their explanation will be omitted. Mixing valve (1
) is checked at regular intervals to see if the opening degree has reached the position stored in the position memory (11) 24), and the valve control determining means (8) is operated until the opening degree reaches the position (24).
24N), repeat steps (22) and (21). As a result, if the mixing valve (1) reaches the memorized opening position (24Y), normal temperature control will start (25).
, to supply hot water (26).

Contrary to the above case, if the set temperature (Ts) is lower than the previous hot water supply temperature (To) (21N), the previous set temperature is higher than the current set temperature, and temperature control is performed accordingly. As a result, hot water may have been prepared. For this reason, the valve control determination means (9) uses the temperature memory (10
) is not read from the position memory (11
) is reset (27) by the reset signal (R).
), and the valve speed calculating means (12) and valve driving means (13) are operated to drive the mixing valve (+) to the fully closed position on the hot water side (28). At this stage, as in the case described above, a subroutine to check whether the mixing valve (1) is operating normally is executed (29), but since the contents of this subroutine are well-known, they will be explained below. is omitted. Check at regular intervals whether the opening degree of the mixing valve (1) has reached the fully closed position on the hot water side (30), operate the valve control determination means (9) until it reaches the position (30%), and step (28)
, repeat (29). As a result, the mixing valve (1)
When it reaches the fully closed position (30Y), normal temperature control starts as described above (25) and hot water is supplied (30Y).
213).

In the above embodiment, the output of the temperature detection means (4) is stored in the temperature memory (lO) by the stop command of the drive switch (7), but the setting value of the temperature setting means (8) is stored in the temperature memory (lO). You can also do this. Further, the fully open position detection means (5) is also for setting the low temperature position, and is not limited to the fully closed position as long as it is an opening position on the low temperature side.

(Effects of the Invention) According to the present invention, as described above, the opening position of the mixing valve is once memorized by the hot water supply stop command, and when the hot water supply command is reintroduced, the previous hot water temperature and the current set temperature are compared. If the set temperature is higher than the previous hot water supply temperature, the mixing valve is quickly moved to the previously memorized opening position, so hot water close to the set temperature can be quickly supplied, making efficient and optimal control possible. In addition, if the set temperature is lower than the previous water supply temperature, a memory is set and the mixing valve is driven to the fully closed position, so the hot water mixing device is highly safe without overshooting. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a hot water mixing apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the hot water mixing apparatus according to an embodiment of the present invention. In the drawings, (1) is a mixing valve, (2) is a mixing pipe, (3) is a stop valve, (4) is a temperature detection means, and (5) is a mixing valve.
) is the low temperature side position detection means, (8) is the position detection means, (7
) is a drive switch, (8) is a temperature setting means, (9) is a valve control judgment means, (10) is a temperature memory, (11) is a position memory, (12) is a valve speed calculation means, (13)
is the valve drive means, and components (9) to (!3) are the main components of the control unit.

Claims (2)

[Claims] (1) A hot water valve that can adjust the amount of hot water from the water heater, a water valve that can adjust the amount of water, a mixing valve that mixes these hot water and water, and a temperature sensor that detects the temperature of the hot water mixed by this mixing valve. an operating means capable of setting a desired hot water supply temperature obtained via the mixing valve and commanding start or stop of the hot water supply; and a setting of the hot water supply temperature by the operating means based on the output of the temperature detector. and a control unit that controls the mixing valve to adjust the temperature, the control unit controlling the opening degree of the mixing valve and the hot water temperature when the hot water supply is stopped based on a hot water supply stop command from the operating means. and a valve control determining means for shifting the mixing valve to a predetermined opening degree, and the valve control determining means stores in the memory a new set temperature when hot water supply is commanded again by the operating means. If the new set temperature is higher than the hot water supply temperature stored in the memory, the mixing valve is rapidly shifted to the opening degree stored in the memory, and the new set temperature is set. A hot water mixing device characterized in that if a set temperature is lower than the hot water supply temperature stored in the memory, the contents stored in the memory are reset. (2) In the apparatus according to claim 1, the hot water temperature recorded in the memory is the temperature detected by the temperature detector when hot water supply is stopped or the temperature set by the operating means when hot water supply is stopped. Characteristic hot water mixing device.