JPS6367477A - Liquid flow control device - Google Patents

Abstract

PURPOSE:To perform the optional flow control and make it unnecessary to provide a water stop faucet by operating a ball-shaped valve body for a fixed time previously stored in a microcomputer, optionally setting the opening position of an electric valve, and providing a solenoid valve. CONSTITUTION:When an operation switch 12 is operated to set the flow to either of four steps of 'small', 'medium', 'large', 'closed', this information is inputted to a microcomputer 11, the current flow value is compared with the newly set flow value, and a transfer switch 9 is switched to the direction to obtain the desired flow value in a short time. Then, after a power switch 10 is operated for the corresponding operation time, it is turned off, and a ball-shaped valve body is maintained at an optional opening position. Accordingly, the optional flow an be controlled only by using an electric valve 1 performing two-position control for the switch operation. On the other hand, a solenoid valve 20 which is opened under energization is closed at the time of power outage, and the fluid dose not flow out regardless of the opening of the electric valve 1. Therefore, no water stop faucet is required to be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid flow rate control device, and is used in a hot water supply circuit such as an electric water heater.

(Prior Art) Conventionally, electric valves have been used to perform meteor control in hot water supply circuits such as electric water heaters. In addition to the electric valve, an automatic mixing valve is used to mix hot water and water at an appropriate ratio, and these two valves are used to automatically adjust the temperature and flow rate.

(Problems to be Solved by the Invention) However, since the electric valve is 0N10FF, that is, it performs two-position control of a fully open state and a fully closed state,
Unable to perform arbitrary flow rate control.

In addition, in a hot water supply circuit that does not have a water stopper at the end of the hot water supply circuit, if the electric valve is in the closed position during a power outage, hot water will not flow out, but if it is in a position other than the closed position, hot water will flow out. As a measure against power outages, it is necessary to separately install a water stopper.

(Means for Solving the Problems) The present invention provides a hot water supply circuit including an electric valve and an energized open type solenoid valve that performs two-position control of an open state and a closed state, and a means for energizing the solenoid valve. , means for selecting either an opening operation or a closing operation for controlling the opening and closing of the electric valve, and a means for controlling the operating time of both the opening and closing operations. For example, a two-way electric valve is used as the electric valve.

Corresponding to the flow rate value instructed by the operation switch, the selection of the opening/closing operation and the operation time are stored in advance in the microcomputer, and any flow rate can be automatically set by operating the operation switch. There is.

(Operation) Select either forward rotation (opening operation) or reverse rotation (closing operation) of the valve element drive motor installed in an electric valve that performs two-position control, such as a two-way electric valve that uses a ball-shaped valve element. Then, this ball-shaped valve body is operated for a certain period of time (several seconds) stored in advance in the memory section of the microcomputer, and the opening position of the motor-operated valve is arbitrarily set. At this time, the energized solenoid valve is also energized and is in an open state. On the other hand, when a power outage occurs, the electromagnetic valve is closed, so that liquid does not flow out regardless of the opening degree of the ball-shaped valve body of the two-way electric valve.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a two-way electric valve used in the liquid flow rate control device of the present invention.

The two-way electric valve 1 consists of a valve operating part 2 and a valve body 3, which are constituted by a synchronous motor, and transmits the rotation of the synchronous motor to a ball-shaped valve body 5 via a valve shaft 4. The valve body 5 is rotated 90 degrees forward and reverse, and the valve opening degree is switched between a fully open state and a fully closed state to control the flow of liquid (indicated by an arrow).

FIG. 2 shows a part of the hot water supply circuit. This hot water supply circuit is provided with an energized open type solenoid valve 20 and the two-way electric valve 1, and the amount of hot water supplied is adjusted by the opening and closing operations of these two valves. Ru.

FIG. 3 is a block diagram showing an example of wiring for operating the two-way electric valve I and the energized open type solenoid valve.

In the figure, the two-way electric valve 1 has three terminals 8a (r white terminal), 8b (r red terminal), and 8c (black terminal).
terminals) are provided, and among these terminals 3a,
8b rotates the rotation direction of the ball-shaped valve body 5 in the normal direction (opening operation)
It is a terminal for controlling the opening and closing of the valve by controlling the opening and closing of the valve by reverse operation (closing operation), and one of these terminals is switched by the changeover switch 9 and connected to the power supply (AClooV) terminal.

The terminal 8C is a terminal to which the other power supply terminal is connected, and a power switch 10 is provided between these terminals.

Switching of the changeover switch 9 and turning on the power switch 10
A one-chip microcomputer 11 controls the 10FF operation time. This microcomputer 11 switches the changeover switch 9 and operates the power switch 10 according to a predetermined procedure (see the flowchart in FIG. 6) by operating an operation switch 12 provided in a remote control box (not shown). It is designed to control time. In this example, the operation switch 12 includes a flow rate setting switch (not shown) that indicates a flow rate value in four stages: "large", "medium", "small", and "close". A storage section (not shown) in the microcomputer 11 stores the switching operations of the changeover switch and the operations of the power switch 10 necessary to maintain the valve opening corresponding to the flow rate value instructed by the operation switch 12. The time (ON time) is stored in advance. The storage section also stores the current flow rate value set by the operation switch 12 so that it can be determined whether the ball-shaped valve body 5 is rotated in the normal direction or in the reverse direction. Table 1 shows examples of setting the operating times of these power switches 10. In the table, "Large", "Medium", "Small", and "Closed" indicate the flow rate values predetermined for the flow rate setting switch, and in this example, each is 16.
The flow rate values are set to 1/min, 101/min, 51/min, and 01/min (see the vertical axis of the graph in FIG. 3).

On the other hand, the solenoid valve 20 has two terminals 21a (“white”).
terminal), 21b (r black terminal) is provided, and the terminal 21
A power switch 2 for the energized open type solenoid valve 20 is connected between a and the power supply.
2 is provided. In particular, in this example, the power switch 10
is operated 0N10FF, thereby arbitrarily setting the opening position of the valve and controlling the flow rate.
By keeping it ON all the time, the flow rate is adjusted by the valve opening of the two-way electric valve 1 during non-power outages, while the solenoid valve 20 is closed during power outages, preventing liquid from flowing out. have.

FIG. 4 illustrates the relationship between the operating time (unit: seconds) of the power switch 10 and the flow rate (unit: 47 minutes).

In the figure, graph 13 shows the characteristics when the two-way electric valve 1 is transferred from the fully open state to the fully closed state, and graph 14
shows the characteristics when transitioning from a fully closed state to a fully open state. For example, in graph 13, the flow rate decreases in a cubic curve as the operating time increases. In addition, in graph 14, as the operating time increases,
The flow rate increases in a cubic curve. In particular, the two-way electric valve 1 of this example is of a type in which the operating time changes from fully closed to fully open and from fully open to fully closed in about 5 seconds.

FIG. 5 is a block diagram functionally showing the internal configuration of the microcomputer 11, and shows a control system for the changeover switch 9 and the power switch 10.

The flow rate value instructed from the operation switch 12 is detected by the remote control switch sensing section 15 and inputted to the determining section 16. The determining unit 16 compares the flow rate value newly instructed by the operation switch 12 with the current flow rate value already stored, and selects the rotation direction of the ball-shaped valve body 5 as forward rotation or reverse rotation. The operating time of the power switch 10 required to flow the instructed flow rate value is set in the time setting section 19 based on Table 1. A signal for selecting the rotation direction of the ball-shaped valve body 5 is output from the selection signal output section 17,
The selector switch 9 is selectively driven via the drive section 18.

On the other hand, a signal instructing the operation time set by the time setting section 19 is output from the opening/closing signal output section 23, and is output from the drive section 24.
The power switch 10 is controlled in a 0N10FF state via the power switch 10.

FIG. 6 is a flowchart illustrating a control procedure executed by the microcomputer 11.

In executing this flowchart, the power switch 22 is turned off.
N, and the energized open type solenoid valve 20 is in a fully open state.

In the flowchart shown in FIG. 6, when the flow rate value instructed by the flow rate setting switch is confirmed in step (2), a comparison is made with the already stored switch state, ie, the current flow rate value, in step (2).

Next, in step (2), in order to obtain the valve opening corresponding to the desired flow rate value, it is selected whether to rotate the selector switch 9 in the forward direction or in the reverse direction, and the operating time of the power switch 10 is determined.

This is the characteristic when the ball-shaped valve body 5 moves from the open state to the closed state side (graph 13 in Fig. 3), and vice versa, the characteristic when the ball-shaped valve body 5 moves from the closed state to the open state side (graph 13 in Fig. 3). Graph 1
4) have different characteristics, so it is necessary to determine the operation time corresponding to each. Then, in step (2), a clock is operated, and in step (2), the elapse of a predetermined operating time is confirmed by the clock (clock), and then, in step (2), the power switch 10 is turned off and the ball-shaped valve body 5 is rotated. to stop.

When the operating switch 12 is operated to set the flow rate to one of the four stages of "small", "medium", "large", and "closed", this information is transferred to the microcomputer 11.
The current flow rate value is compared with the newly set flow rate value, and the selector switch 9 is switched to obtain the desired flow rate value in a shorter time, and the changeover switch 9 is switched for the operating time corresponding to Table 1. After operating the power switch 10, the power switch 10 is turned off to hold the ball-shaped valve body 5 at an arbitrary opening position and allow a desired flow rate to flow.

On the other hand, during a power outage, the energized open type solenoid valve 20 is fully closed because no AC power is applied to it, so no matter what valve opening degree the two-way electric valve 1 is maintained, hot water will not flow out.

In the above-described embodiment, the power switch 22 for the solenoid valve is configured so that it can be controlled 0N10FF not only during a power outage but also by the microcomputer 11, but of course, even if this power switch 22 is omitted, it will not work during a power outage. The operation in is the same as described above.

Furthermore, although the above-described embodiments have been exemplified using a two-way electric valve using a ball valve, it is of course possible to use a disc valve in the same manner. Further, in this example, the valve operation time corresponding to the flow rate value is stored in advance in the microcomputer 11, but this is not limited to this case. If the ball-shaped valve body 5 is configured to rotate only while the valve is being operated, the flow rate can be continuously adjusted to any desired value.

[Table 1] (Effects of the Invention) As described above, according to the present invention, an arbitrary flow rate can be controlled by simply operating a switch using an electric valve that performs two-position control. In addition, since it is equipped with an energized open type solenoid valve, the liquid will not flow out even during a power outage, so there is no need to provide a water stopper.

[Brief explanation of the drawing]

FIG. 1 shows two parts used in the liquid flow rate control device according to the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of a two-way motor operated valve and an energized open type solenoid valve. Fig. 3 is a wiring example of a two-way motor operated valve and an energized open type solenoid valve. A block diagram showing
FIG. 4 is a characteristic diagram showing the relationship between valve opening/closing operation time and flow rate, FIG. 5 is a block diagram functionally showing the internal configuration of the microcomputer, and FIG. 6 is a flowchart illustrating the control procedure. 1... 2-way electric valve 5... Ball-shaped valve body 9
... Selector switch 10 ... Power switch 11
... Microcomputer (microcomputer) 12 ... Operation switch 20 ... Energized open type solenoid valve 22 ...
Power switch patent applicant Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Kaoru Figure 7 Figure 2 Figure 31! J Figure 6 ■ ■ ■ ■ ■ ■ ■

Claims (1)

[Scope of Claims] 1) A motor-operated valve and an energized open type solenoid valve that performs two-position control of an open state and a closed state are provided in a hot water supply circuit, and a means for energizing the solenoid valve and a means for opening and closing the motor-operated valve. 1. A liquid flow rate control device comprising: means for selecting either an opening operation or a closing operation for controlling the opening and closing operations; and means for controlling operating time of both the opening and closing operations.