JPH073644B2 - Hot water mixing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot and cold water mixing apparatus including a control unit that adjusts the opening degree of a mixing valve based on a deviation between a hot water temperature and a set temperature. The opening of the mixing valve at the time of hot water supply is stored, and if the predetermined condition is satisfied at the next hot water supply, the stored opening is used to shorten the control time until the hot water reaches the set temperature. The present invention relates to a hot and cold water mixing device.

(Prior Art) It is possible to supply hot water of a desired temperature by adjusting the amount of hot water passing through the hot water valve and the amount of water passing through the hot water valve based on the deviation between the temperature of the mixed hot water and the set temperature. Hot water mixing devices are well known. In this type of hot and cold water mixing device, when hot water supply is stopped, the opening of the mixing valve is called a reset position or a neutral position, which is a fully closed position on the hot water side or an intermediate position between the fully open position on the hot water side and the fully closed position on the hot water side. Have control. By returning the opening of the mixing valve to the reset position or the neutral position and performing the control based on the deviation from the position at the time of the next hot water supply, hot water at an unexpected temperature is temporarily supplied at the start of the next hot water supply. I try not to be.

(Problems to be Solved by the Invention) However, in the conventional hot and cold water mixing apparatus, since the opening degree of the mixing valve based on the deviation between the hot water temperature and the set temperature is always controlled from the reset position or the neutral position, the desired hot water temperature is controlled. It may take some time to reach the opening degree at which

The present invention has been made to solve such a problem. When a temperature equal to or higher than the previous hot water supply temperature is set, the control based on the deviation from the opening degree of the mixing valve at the previous hot water supply. It is an object of the present invention to provide a hot and cold water mixing apparatus that shortens the time until hot and cold water having a desired temperature is obtained by starting the above.

(Means for Solving the Problems) In order to solve the above problems, a hot and cold water mixing apparatus according to the present invention includes a mixing valve for mixing hot water and water, and a temperature detection for detecting the temperature of hot water mixed by the mixing valve. And an operating means for setting a desired hot water supply temperature obtained via the mixing valve and for instructing start or stop of hot water supply, and for adjusting the hot water supply temperature to the set temperature of the operating means based on the output of the temperature detector. In a hot water mixing apparatus having a control unit for controlling the mixing valve, the control unit opens a mixing valve and a memory for storing the mixing valve opening and the hot water temperature when the hot water supply is stopped based on the hot water supply stop command from the operating means. And a valve control determining means for shifting the temperature to a high temperature. The valve control determining means stores a new set temperature in the memory when the hot water is again commanded by the operating means. In comparison, if the new set temperature is equal to or higher than the hot water supply temperature stored in the memory, the temperature detected by the temperature detector is prioritized and the mixing valve is moved to the opening degree stored in the memory. It is characterized by having done.

The hot water supply temperature stored in the memory may be the temperature detected by the temperature detector when the hot water supply is stopped or the set temperature of the operating means when the hot water supply is stopped.

(Operation) When the hot water supply is started, the valve control determination means first compares the set temperature with the hot water supply temperature at the previous hot water stored in the memory, and if the set temperature is equal to or higher than the previous hot water supply temperature, the mixing valve After shifting to the opening for hot water supply last time stored in the memory, the opening of the mixing valve is controlled based on the deviation between the hot water temperature and the set temperature to adjust the temperature.

If a temperature equal to or higher than the previous hot water supply temperature is set, the temperature of the mixing valve is set to the initial value because normal temperature adjustment control is performed after the opening of the mixing valve is set to the previous opening. Compared with the conventional configuration in which adjustment is performed based on the temperature deviation from the position (for example, the intermediate position or the fully closed position on the hot water side), it is possible to shorten the time required to reach the valve opening degree at which the desired hot water temperature can be supplied.

Further, when a temperature lower than the hot water supply temperature of the previous time is set, by performing a normal control from the initial position without using the opening of the mixing valve of the previous time, for example, hot water supply of the high temperature last time is performed. Even if it does, hot water will not be temporarily supplied at the time of the next hot water supply, which is safe.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings.
In addition, in each figure, the same reference numerals denote the same objects.

FIG. 1 is a system diagram of a hot and cold water mixing apparatus according to an embodiment of the present invention. In the figure, (1) is a mixing valve for adjusting the opening position so that the hot water supply valve (1a) and the water supply valve (1b) are interlocked by a motor or the respective valves are driven to obtain a desired hot water temperature, ( 2) is a mixing valve (1)
Mixing pipe for sending hot water mixed in, (3) is a stop valve (calant) that is automatically opened and closed to supply hot water at a desired temperature, and (4) is a thermistor provided in the middle of the mixing pipe (2). Temperature detection means, (5) is a fully closed position detection means such as a limit switch for detecting a low temperature position, that is, a position where the hot water supply valve (1a) is fully closed, and (6) is an opening position of the mixing valve (1). Position detecting means such as a step motor (also serving as a drive motor for the mixing valve (1)) for detecting
(7) is a drive switch having a hot water supply switch and a hot water supply stop switch provided on an operation panel (not shown), (8) is a temperature setting means for setting a desired hot water supply temperature, (9)
Reference numerals (13) to (13) are a valve control determination means, a temperature memory, a position memory, a valve speed calculation means, and a valve drive means, which are components of the control unit. Needless to say, the present invention can be applied not only to the case where the hot water supply valve and the water supply valve are provided independently, but also to the mixing valve in which the two valves are interlocked to change the ratio of hot water. Hereinafter, these configurations will be described focusing on the control unit.

First, the valve control determination means (9) compares the output signals of the temperature detection means (4) and the temperature setting means (8) based on the hot water supply command of the drive switch (7) to set the hot water supply temperature (To). The temperature is controlled to approach the temperature (Ts), and the hot water supply is stopped by the hot water supply stop command of the drive switch (7). Secondly, the temperature control is executed by the data of the temperature memory (10) and the position memory (11) and the output signal of the fully closed position detecting means (5). That is, when there is a cycle of hot water supply → stop → hot water supply, the temperature (To) stored in the temperature memory (10) at the time before the hot water supply was stopped is compared with the set temperature (Ts), and the set temperature (Ts) is If it is higher than the previous hot water supply temperature (To), control is executed with the previous valve position stored in the position memory (11) as the target value. If the set temperature (Ts) is lower than the previous hot water supply temperature (To), the reset signal (R) is generated to reset the contents stored in the position memory (11).

The temperature memory (10) uses the stop command of the drive switch (7) as a set signal (T1) to set the hot water temperature (To) during hot water supply.
Is read from the temperature detector (4). The content read out from the temperature memory (10) is output by the valve control determination means (9).
According to own command signal. The stored contents of the temperature memory (10) are updated each time a reset signal (T1) which is a stop command for the drive switch (7) is input.

The position memory (11) reads the opening position of the mixing valve (1) at the time of hot water supply from the position detector (6) using the stop command of the drive switch (7) as a set signal (T2). The reading of the contents of the position memory (11) is based on the command signal of the valve control judging means (9) itself. The stored content of the position memory (11) is cleared by the reset signal (R) generated when the valve control determination means (9) determines that the set temperature (Ts) is lower than the previously stored temperature (To).

The valve speed calculation means (12) calculates the opening / closing speed of the valve based on the type of the output signal of the valve control determination means (9). For example, in the above-described first control, normal opening / closing control is executed, and in the second control, an instruction is issued to shift to the valve position stored in the position memory (11) at the maximum speed. Such a valve speed calculation means (12) can be constituted by, for example, a table memory in which various valve opening / closing speed patterns are stored, and a part of the output signal of the valve control determination means (9) is used as an address signal. The opening / closing speed signal can be read.

The valve drive means (13) forms a drive signal for controlling the opening and closing of the mixing valve (1) according to the control method determined by the valve control determination means (9) and the operation speed determined by the valve speed operation means (12). For controlling the direction of rotation of the motor and for controlling the motor.
It forms the PWM signal etc.

The operation of this embodiment will be described below with reference to the flowchart of FIG. In the following explanation, (20) ~ (30)
Number corresponds to each block number in the flowchart.
Further, symbols 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 supply temperature (To) in the temperature memory (10) in the previous hot water supply stop operation. The temperature is read from the temperature memory (10) (20A), the set temperature (Ts) of the temperature setting means (8) of the operation panel is read (20B), and the set temperature (Ts) is the previous hot water supply temperature (To). ) Higher or lower than (Ts ≧ To)
Do (21). At this stage, generally the mixing valve (1)
Is in the reset position. Here, if the set temperature (Ts) is higher than the hot water supply temperature (To) at the previous time (21Y), there is no risk of overshoot, so it is necessary to shift to the valve position stored in the position memory (11) at full speed. The valve speed calculating means (12) and the valve driving means (13) are operated (22).
At this stage, a malfunction check subroutine is executed to check whether the mixing valve (1) is operating normally (23),
Since the contents of this subroutine can be known, the description thereof will be omitted. Whether the opening of the mixing valve (1) has reached the position stored in the position memory (11) is checked at regular intervals (24), and the valve control determination means (9) is operated until the opening reaches the opening. (24N), step (2
Repeat steps 2) and (23). As a result, when the mixing valve (1) reaches the memory opening position (24Y), normal temperature control is started (25) and hot water is supplied (26). When the hot water supply switch is turned off (31), the temperature is rewritten (updated) in the temperature memory (10) (32), and the hot water supply ends. On the other hand, if the hot water switch is not turned off (31N),
Continue normal temperature control (25).

Contrary to the above case, when the set temperature (Ts) is lower than the hot water supply temperature (To) last time (21N), the previous set temperature is higher than the current set temperature, and the temperature control according to this is performed. Result Hot water may have been prepared. For this reason,
The valve control determination means (9) does not read the data from the temperature memory (10), resets the contents of the position memory (11) by the reset signal (R) (27), and turns on the mixing valve (1). Valve speed calculation means (12) and valve drive means (13) so as to drive to the fully closed position on the hot water side
Actuate (28). At this stage, as in the case described above, a subroutine for checking whether or not the mixing valve (1) is operating normally is executed (29), but since the contents of this subroutine are well known, explanation will be given. Is omitted. Whether or not the opening degree of the mixing valve (1) reaches the hot water side fully closed position is checked at regular intervals (30), and the valve control determination means (9) is operated (30N) until the position is reached, and the step is performed. Repeat (28) and (29). As a result, when the mixing valve (1) reaches the fully closed opening position (30Y), normal temperature control is started in the same manner as described above (2
5), hot water supply (26).

In the above embodiment, the output of the temperature detecting means (4) is stored in the temperature memory (10) by the stop command of the drive switch (7), but the set value of the temperature setting means (8) is stored. You may Further, the fully closed position detecting means (5) is also for setting the low temperature position, and is not limited to the fully closed position as long as it is the opening position on the low temperature side.

(Effects of the Invention) As described above, the hot and cold water mixing apparatus according to the present invention stores the hot water supply temperature at that time and the opening degree of the mixing valve in the memory when the hot water supply is stopped, and at the start of the next hot water supply, the previous hot water supply temperature and the current hot water supply temperature. If the set temperature is equal to or higher than the previous hot water supply temperature, the mixing valve is set to the previous opening, and then the mixing valve is opened based on the deviation between the hot water temperature and the set temperature. Since the temperature control is performed, when the temperature equal to or higher than the previous hot water supply is set, the hot water close to the set temperature can be quickly supplied.

[Brief description of drawings]

FIG. 1 is a system diagram of a hot and cold water mixing apparatus according to an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of the hot and cold water mixing apparatus according to the 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 detecting means,
(5) is a low temperature side position detecting means, (6) is a position detecting means,
(7) is a drive switch, (8) is temperature setting means, (9)
Is a valve control determination means, (10) is a temperature memory, (11) is a position memory, (12) is a valve speed calculation means, (13) is a valve drive means, and the components (9) to (13) are controllable. It is the main component of the unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hirofumi Takeuchi Inventor Hirofumi Takeuchi 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Totoki KK (56) Reference JP-A-61-153421 (JP, A) Actual Development Sho 52-129061 (JP, U)

Claims (2)

[Claims] 1. A mixing valve for mixing hot water and water,
A temperature detector for detecting the temperature of the hot water mixed by the mixing valve, an operating means for setting a desired hot water supply temperature obtained via the mixing valve and for instructing the start or stop of the hot water supply, and the temperature detection In a hot and cold water mixing apparatus including a control unit that controls the mixing valve to adjust the hot water supply temperature to a set temperature of the operating means based on the output of a water heater, the control unit is based on a hot water supply stop command of the operating means. A memory for storing the opening degree of the mixing valve and the hot water supply temperature when the hot water supply is stopped, and a valve control determining means for shifting the mixing valve to a predetermined opening degree are provided by the operating means. Is compared with the hot water supply temperature stored in the memory, and the new set temperature is stored in the memory as the hot water supply temperature. If the temperature is equal to or higher than the temperature, the hot water mixing apparatus is characterized in that the temperature detected by the temperature detector is prioritized and the mixing valve is moved to the opening degree stored in the memory. 2. The apparatus according to claim 1, wherein the hot water supply temperature stored in the memory is a temperature detected by the temperature detector when hot water supply is stopped or a set temperature of the operating means when hot water supply is stopped. A hot and cold water mixing device.