JPH01203770A - Hot/cold water mixing controller - Google Patents

Abstract

PURPOSE:To speedily adjust the flow rate to a set value free from hunting by varying the duty ratio of the pulse for energizing a flow rate adjusting means according to the magnitude of the flow rate difference. CONSTITUTION:The flow rate difference is obtained from the hot water supply quantity obtained by a flow detecting means 9 and a set flow rate, and the flow rate is adjusted by outputting pulse signals into a flow rate adjusting means 15 by varying the duty ratio by a PWM(pulse width modulation) setting means 18 from the flow rate difference value. When the flow rate difference is large, the duty ratio of the pulse outputted from the PWM setting means 18 is increased, while if the flow rate difference is small, the energizing quantity is reduced by reducing the duty ratio of the pulse. Therefore, adjustment to the set flow rate is carried out speedily, free from hunting.

Description

[Detailed Description of the Invention] Industrial Fields of Application The present invention relates to mixing hot water and cold water to create suitable temperature hot water for bathing and bathing, and for mixing hot water and water to create hot water for filling bathtubs. It is related to the device.

2. Description of the Related Art A conventional hot water mixing control device is disclosed in, for example, Japanese Patent Application Laid-open No. 1181-1981.
As shown in Publication No. 85, it had the configuration shown in FIG.

In FIG. 6, a water side valve 3 and a hot water side valve 4 are installed in the middle of the water side piping 1 and the hot water side piping 2, and a water side drive unit 5 (for example, a motor, etc.) and a hot water side drive unit 6 are installed on the water side, respectively. Valve 3 and hot water side valve 4
Adjust the valve opening degree. The water side pipe 1 and the hot water side pipe 2 merge to form a mixing pipe element, and a hot water temperature detection means 8 and a flow rate detection means 9 are provided in the middle of the mixing pipe 7. A switching valve 1o is installed downstream of the mixing pipe 7 to switch the flow path to the flusher 11 or the shower 12. The signals from the hot water temperature detection means 8 and the flow rate detection means 9 are input to the control unit 13, and the water side valve 3 and the hot water side valve 4 are adjusted so that the set temperature and flow rate are achieved. .

Next, the operation of the above configuration will be explained.

First, at the start of hot water supply, the switching valve 10 is opened to the flush 11 side or the shower 11 side. When hot water starts to be dispensed, the temperature and flow rate of the mixed hot water are detected by the hot water temperature detection means 8 and the flow rate detection means 9, and are input to the control section 13. The control unit 13 compares and determines the set flow rate and the amount of hot water dispensed, and adjusts the valve opening degrees of the water side valve 3 and the hot water side valve 4.

Here, if it is expressed as (discharged hot water amount - set flow rate) < - (allowable error), the control unit 13 adjusts the opening degree of the hot water side valve 4 at a speed proportional to the value of the set flow rate - discharged hot water Jil. As a result, the amount of hot water produced increases. This is detected by the flow rate detection means 9 and fed back to the control section 13, and the opening degree is adjusted so that the value of 1 set flow rate - 1 hot water output amount falls within the allowable error.

Problem to be Solved by the Invention However, in such a hot water mixing control device, when trying to quickly adjust the flow rate to the set flow rate, the proportional gain multiplied by 1 set flow rate - hot water output amount 1 is increased, and the hot water side valve 4 and the water side valve 3 are The opening and closing speed must be increased.

However, if this is done, a hunting condition will occur near the set flow rate. On the other hand, if the proportional gain is made smaller and the speed at which the hot water side valve 4 and the water side valve 3 are opened or closed is made smaller, it takes time to adjust the flow rate, which is inconvenient for the user.

The present invention has been made in view of this problem, and it is an object of the present invention to provide a hot water mixing control device that can quickly adjust the flow rate of hot water to a set flow rate without hunting.

Means for Solving the Problems In order to solve the above problems, the hot water mixing control device of the present invention includes a mixing means for adjusting the mixing ratio of the amount of hot water, a flow rate adjusting means for adjusting the flow rate of the mixed hot water, and a mixing flow rate. a flow rate detection means for detecting, a flow rate setting means for setting a mixed flow rate, a flow rate calculation means for calculating a flow rate deviation from the flow rate setting means and the flow rate detection means, and energizing the flow rate means according to the magnitude of the flow rate deviation. and PWM setting means for changing the duty ratio of the pulses and outputting them to the flow rate adjusting means.

Operation With the above configuration, the flow rate deviation is determined from the hot water output amount determined by the flow rate detection means and the set flow rate, and the fiPW is calculated from the value of the flow rate deviation.
The M setting means changes the duty ratio and outputs a pulse signal to the flow rate adjusting means to adjust the flow rate.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, components that are the same as those of the conventional example shown in FIG. 6 are given the same reference numerals, and their explanations will be omitted. In FIG. 1, the mixing means 14 adjusts the mixing ratio of the amount of hot water and the amount of water. Here, the mixing means 14
The hot water side valve that adjusts the amount of hot water and the water side valve that adjusts the amount of water are fixed on one axis and driven by one driving means (for example, a motor, etc.)
There are two methods: one in which the water side valve and the hot water side valve are energized by two corresponding driving means.

The flow rate adjustment means 16 can output mixed hot water or stop hot water supply.
Also, after adjusting the flow rate, switch the flow path to the shower 11 or shower 12 side. The flow rate setting means 16 is connected to the control unit 13 and sets the value of the mixed flow rate of hot water discharged from the shower 11 or the shower 12.

FIG. 2 shows a specific configuration of the control section 13.

The flow rate deviation calculation means 17 calculates the flow rate deviation from the output signals of the flow rate detection means 9 and the flow rate setting means 16.

PWM (Pulse Width Modulation) setting means 18 changes the duty ratio of the output pulses from 100% to 0% according to the magnitude of the flow rate deviation signal from the flow rate deviation calculation means and outputs it to the flow rate adjustment means 15.

FIG. 3 shows the configuration of the PWM setting means 18. Duty ratio calculation means 18a is a flow deviation calculation means 17
The pulse duty ratio to be output to the flow rate adjustment means 15 is calculated from the flow rate deviation value obtained in the above and the duty ratio setting means 18b. Then, the energizing amount setting means 18c outputs a pulse of the duty ratio determined by the duty ratio calculation means 18a to the flow rate adjustment means 16.

Next, the operation of this embodiment with the above configuration will be explained using the flowchart shown in FIG. Assume that the user operates the flow rate setting means 16 to increase or decrease the flow rate set value Q8. The flow rate detection means 9 detects the mixed flow iQ0, and the flow rate deviation calculating means 17 calculates the flow rate deviation Ef (Ef=Qs-00). (Pl in Figure 4.

Corresponds to PP. ) Then, it is checked at P whether the flow rate deviation Ef is below the allowable value. If the flow rate deviation Ef is not below the allowable value, the PWM setting means 18 sets a pulse duty ratio according to the magnitude of the flow rate deviation Ef and outputs it to the flow rate adjustment means 15. Here, if the flow rate deviation E is greater than or equal to a predetermined value, the duty ratio is set to 100%, and the flow rate adjusting means 16 is driven at the maximum energizing amount. The amount of hot water Q is the set flow rate QI
When the flow rate deviation Ef approaches 1, the duty ratio of the pulse is reduced (corresponding to p6.p6 in Fig. 4).If the flow deviation Ef falls within the allowable range, the duty ratio is set to 0% and the flow rate adjustment means 16 stop. FIG. 5 shows how the duty ratio τ/T changes with respect to the magnitude of the flow rate deviation. (A) is a case where the flow rate deviation is large, that is, the duty ratio is 100ch, and as the flow rate deviation gradually becomes smaller, it changes as shown in (B) and (Q).

By driving the flow rate adjustment means by changing the duty ratio in this manner, even if the user changes the flow rate setting, the flow rate adjustment means 16 can be energized with sufficient torque quickly and with suppressed hunting. The flow rate can be adjusted stably.

Effects of the Invention As described above, the hot water mixing control device of the present invention calculates the flow rate deviation when the user changes the flow rate setting, and increases the duty ratio of the pulses output by the PWM setting means when the flow rate deviation is large. Furthermore, when the flow rate deviation is small, the duty ratio of the pulse is reduced and the energizing amount is reduced, so that the set flow rate can be adjusted quickly and without hunting, improving usability for the user.

[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 a control block diagram of the device, FIG. 3 is a configuration diagram showing the configuration of the PWM setting means of the device, and FIG. 4 is a flowchart showing the operation of the device, and Fig. 6 is a flowchart showing the operation of the device.
The output waveform diagram output from the WM setting means, FIG. 6, is a system diagram of a conventional hot water mixing control device. 9...Flow rate detection means, 14...Mixing means, 15...Flow rate adjustment means, 16...
Hot water amount setting means, 17...Flow rate deviation calculation means, 1
8...PWM setting means. Fig. 1 15 - Translate the fishing! Speed jII
Law Figure 4 Figure 5

Claims (1)

[Claims] A mixing means for adjusting the mixing ratio of high temperature hot water and water, a flow rate adjusting means for adjusting the flow rate of the mixed hot water made by the mixing means, a flow rate detection means for detecting the flow rate of the mixed hot water, and a flow rate detecting means for detecting the flow rate of the mixed hot water. a flow rate setting means to be set; a flow rate deviation calculating means for calculating a flow rate deviation from the flow rate detecting means and the flow rate setting means; A hot water mixing control device comprising a PWM (Pulse Width Modulation) setting means for changing the duty ratio of a pulse applied to the water and outputting the same to the flow rate adjusting means.