KR101740337B1 - Electrical driving ball valve for controlling precise quantity of flow - Google Patents

Abstract

The present invention discloses an electric ball valve capable of precisely controlling a flow wirelessly, including: a valve body (10); an opened/closed shaft (12); a speed reduction gear box (20); a driving motor (30); a potentiometer (40); a cam (50); a pair of limit switches (60); a wireless transmitter/receiver (90); a microcomputer (300); a servo amp (200); and a power supply (400). The present invention can precisely control a flow in a manner that controls an operation of a driving motor by detecting a displacement of a rotation angle in real time, and that precisely controls a desired opening/closing value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric ball valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric ball valve, and more particularly, to an electric ball valve capable of precisely controlling a flow rate by controlling an opening / closing angle by detecting an opening / closing angle of a ball wirelessly.

In general, a ball valve is a valve that opens and closes a flow path or controls a flow of a fluid by rotating a ball of a predetermined shape by a screw in close contact with a valve seat. The ball valve is mainly used for a water pipe, a gas pipe or the like because of its high valve opening and closing speed and its pressure resistance.

The ball valve is classified into a spherical valve having a spherical shape, a notched valve having a notch formed in the ball, and a hemispherical valve having a hemispherical shape according to the shape of the ball embedded therein.

1 is a sectional view of a conventional manual ball valve.

As shown in FIG. 1, a conventional ball valve has a handle 1 and a ball 2 connected to each other through a shaft 3, and the ball 2 is provided in a ball seat provided in the main body 4 . When the handle (1) is rotated, its rotational force is transmitted to the ball (2) through the shaft (3). Therefore, when the ball 2 is rotated 90 degrees and the center line of the hole 2a formed at the center of the ball 2 coincides with the center line of the flow paths 4a and 4b formed in the main body 4, Conversely, when the center line of the hole 2a formed in the ball 2 forms an angle of 90 degrees with the center line of the flow paths 4a and 4b formed in the main body 4, the flow path is blocked.

As described above, the conventional manual ball valve controls the rotation of the ball with the handle to open or shut off the flow path, thereby interrupting the flow of the fluid flowing through the flow path.

An automatic ball valve developed for the inconvenience of manual control means a ball valve that controls the on / off of fluid flow by power (electric type, pneumatic type, hydraulic type) by connecting an actuator to ball valve .

2 is a coupling diagram of the components of a conventional automatic ball valve.

2, the conventional automatic ball valve has a structure in which a control member for rotating the ball 110, that is, an actuator 150 is coupled to an upper portion of a housing, which is a body of a body 101 and a cap.

The housing 100 and the actuator 150 are connected to each other through a bracket 130. The stem 120 in the housing 100 is connected to the ball 110 at one end for rotating the ball 110, And is connected to the actuator 150 through the shaft 140.

At this time, the bracket 130 and the shaft 140 are referred to as a coupling member 180. The bracket 130 and the body 101 are coupled by a fixing means 170 such as a bolt and a nut and the ground flange 160 is engaged with the body 101. Accordingly, when an operation load is generated in the valve due to the fluid pressure and friction, the actuator 150 generates a driving force to rotate the stem 120 connected at one end, and rotates the stem 120 at the other end of the stem 120 The connected ball 110 rotates and the valve is opened. As a result, the flow path is opened by opening the valve, and the fluid inside the fluid flows in one direction through the open flow path.

However, the automatic ball valve as described above can only automatically open and close the ball, and it is difficult to control the flow rate through precise opening and closing operations.

Further, there is a problem that there is no sudden stop means due to malfunction of the actuator.

In addition, remote monitoring and control is impossible, which makes it difficult to respond in real time.

Korean Registered Patent No. 10-1225531 (Feb. 17, 2013) "Ball Valve Module" Korea Public Utility Model 20-2013-0004067 (Feb. 3, 2013) "Ball Valve Control Device" Korea public utility model 20-2010-0002921 (2010.3.12) "Electronic valve for compressor"

Accordingly, an object of the present invention is to provide an electric ball valve capable of precisely controlling the flow rate by controlling the operation of the drive motor by sensing the current rotational angular displacement in real time and precisely controlling the desired opening / closing value, .

And to provide a motorized ball valve which can precisely control the flow rate by preventing the malfunction of the drive motor by operating the limit switch in an abnormal state. In addition, it is possible to provide an electrically operated ball valve that can be remotely controlled and monitored by a PC or a mobile.

In order to achieve the above object, the present invention provides an electric ball valve capable of precisely controlling a flow rate by radio, comprising: a valve body (10) having an opening / closing ball for opening / closing a flow path; An opening / closing shaft (12) coupled to an upper portion of the opening / closing ball; A reduction gear box (20) having a reduction gear set therein and a lower end of a drive shaft (22) penetrating up and down is interlocked with the opening and closing shaft (12); A driving motor 30 for transmitting a forward or reverse driving force to the reduction gear box 20 to open and close the valve by opening and closing the ball through the opening and closing shaft 12; A potentiometer (40) coupled to an upper end of a drive shaft of the reduction gear box (20) to sense a rotational angular displacement of the drive shaft (22) in real time; A cam 50 provided between the lower end of the driving shaft 22 and the opening and closing shaft 12 and having a two-stepped protrusion 90 degrees apart from the outer circumference of the driving shaft 22 and the opening and closing shaft 12; A pair of limit switches (60) provided on one side of the cam (50) in two stages; A wireless transceiver 90 for receiving a target rotational angular displacement of the opening and closing shaft 12 transmitted from a PC or a mobile device and for transmitting a current rotational angular displacement sensed in real time by the potentiometer 40; When the target turning angle of the opening and closing shaft 12 is inputted, the driving motor 30 is controlled until the current turning angle of the driving shaft 22 sensed by the potentiometer 40 becomes equal to the current turning angle of the driving shaft 22, Closing axis 12 detected by the potentiometer 40 in real time, and when the rotation angle displacement or the driving angle becomes a limit angle of 0 degree or 90 degrees, the limit switch 60 is turned on, A microcomputer 300 for controlling the operation of the driving motor 30 to be stopped; A servo amplifier 200 for causing an exciting current to flow so that the driving motor 30 is operated by a command received from the microcomputer 300; And a power supply 400 for supplying power to the driving motor 30, the wireless transceiver 90, the servo amplifier 200, the microcomputer 300, and the limiting angle sensing circuit for sensing the limiting angle. .

The limit switch 60 is composed of a first limit switch 62 at the upper end and a second limit switch 64 at the lower end and the protrusion of the cam 50 is connected to the first protrusion 52 at the upper end, 2 protrusion 54. When the first protrusion 52 turns on the first limit switch 62 when the cam 50 rotates in the forward direction and reaches 90 degrees, If the second protrusion 54 turns on the second limit switch 64 when the cam 50 rotates in the reverse direction and reaches 0 ° C, The circuit is cut off by the second diode D2, and the drive motor 30 is stopped.

The micom 300 can control the driving motor 30 wirelessly from a PC or a mobile device remotely through the wireless transceiver 90 and the limit switch 60 is operated so that the driving motor 30 And when it stops, sends a warning signal to the PC or the mobile device.

A method for precise flow rate control of an electrically operated ball valve by radio using an electrically operated ball valve capable of precise flow control by radio, comprising: a first step of inputting a desired opening / closing value of an opening / closing ball; A second step of operating the drive motor (30); A third step in which the opening and closing shaft 12 rotates; A fourth step in which the potentiometer (40) senses the rotational angular displacement of the drive shaft (22) interlocked with the opening / closing shaft (12) in real time; A fifth step of comparing whether the target rotational angular displacement, which is a target value, coincides with a current rotational angular displacement which is a current value; Returning to the second step when the target value does not match the current value, and stopping the drive motor (30) when the target value and the current value match; A seventh step of wirelessly receiving and transmitting the driving angle of the driving shaft (22) coinciding with the current rotational angular displacement sensed in real time in the fourth step; An eighth step of confirming whether the current rotational angular displacement has reached a limit angle; And a ninth step of returning to the second step when the current angular displacement has not reached the limit angle, and stopping the drive motor (30) when the current angular displacement reaches the limit angle .

And the limiting angle is 0 degrees or 90 degrees.

According to the present invention described above, since the potentiometer senses the current angular displacement in real time and controls the operation of the driving motor, the desired opening / closing value can be precisely controlled, and precise flow control is possible.

In addition, since the limit switch is operated in an abnormal condition, malfunction of the drive motor can be prevented.

In addition, it is controllable by PC or mobile, which enables an administrator to monitor and control remotely.

1 is a sectional view showing a conventional ball valve;
Fig. 2 is a joint view of the components of a conventional automatic ball valve. Fig.
3 is a perspective view illustrating a structure of an electrically operated ball valve capable of precisely controlling a flow rate by radio according to a preferred embodiment of the present invention.
4 is an exploded perspective view of the present invention shown in Fig.
FIG. 5 is a block diagram showing the relationship between the components including the microcomputer and the wireless transceiver of FIG. 3; FIG.
Figure 6 is a side view of the invention shown in Figure 3;
7 is a plan view showing a cam and a limit switch structure of the present invention.
8 is a flowchart showing a remote control process of the present invention.
9 shows a limiting angle sensing circuit of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 3 is an exploded perspective view showing a structure of an electrically operated ball valve capable of precise flow control by radio according to a preferred embodiment of the present invention. FIG. 4 is an exploded perspective view of the present invention shown in FIG. 1 is a block diagram showing the relationship between components including a microcomputer and a wireless transceiver according to the present invention.

The present invention mainly relates to a valve control apparatus for a vehicle including a valve body 10, an opening and closing shaft 12, a reduction gear box 20, a drive motor 30, a potentiometer 40, a microcomputer A limit switch 60, a wireless transceiver 90, a microcomputer 300, a servo amplifier 200, and a power supply 400 for supplying power to the limit angle sensing circuit.

First, the valve body 10 is provided with an inlet through which the fluid flows and an outlet through which the fluid flows, and an opening and closing ball (not shown) for opening and closing the flow passage is provided in the valve body 10.

The opening / closing ball has a shape penetrating from one side to the other side, and the outer periphery has a spherical shape, and is seated in the valve body (10) and rotatable.

At this time, the upper bracket 14 and the lower bracket 16 may be further coupled to the inlet and outlet sides of the valve body 10. The upper and lower brackets are coupled to surround the outer periphery of the inlet and outlet, respectively, and the lower plate 70 is fixed to the upper surface. Therefore, the upper surface of the upper bracket 14 may have a flat structure.

Next, the opening / closing shaft 12 is engaged with the upper portion of the opening / closing ball and rotates thereby to induce rotation of the opening / closing ball.

The opening and closing shaft 12 has a lower end coupled to an upper portion of the opening and closing ball and an upper end inserted into the valve body 10 so as to protrude upward. At this time, the bearing can be inserted so that the opening and closing shaft 12 is rotatable.

The reduction gear box 20 is located on the upper side of the opening and closing shaft 12 and includes a plurality of gears interlocked therein to reduce the speed of the input and output. As shown in the drawing, the output drive shaft 22 is vertically passed through and the lower end of the drive shaft 22 is engaged with the upper end of the opening and closing shaft 12 and interlocked.

At this time, the driving shaft 22 and the opening and closing shaft 12 are coupled to each other by a cam 50, which will be described later.

In the present invention, it is preferable to reduce the speed to about 900: 1 to about 1100: 1 by the reduction gear box as a result of deriving the optimum reduction ratio for accurate flow control. When the speed is reduced to 1000: 1, ) Can take about three minutes in one rotation.

Next, a driving motor 30 is coupled to the input side of the reduction gear box 20 to transmit the driving force. The drive motor 30 is preferably a DC motor capable of forward rotation, reverse rotation, and speed control.

When the driving motor 30 transmits the driving force to the reduction gear box 20, the rotational speed is reduced to be transmitted to the driving shaft 22 and the opening and closing shaft 12 connected to the driving shaft 22 rotates, Respectively.

In the present invention, a potentiometer 40 is directly connected to the upper side of the driving shaft. The potentiometer is also called a potentiometer, an angle sensor, a potentiometer, and a variable resistance, and is a displacement sensor that obtains a voltage output proportional to a mechanical displacement amount.

The resistor and the wiper (brush) are the basic constitution, and the relative displacement amount of the resistor and the wiper is converted into the voltage output. If the resistor and the brush are rotating type, the rotation angle is measured, and if it is linear, the simple displacement can be measured.

In the present invention, the potentiometer 40 is a sensor for measuring a rotational angular displacement and is directly coupled with the drive shaft 1: 1 to detect the rotational angular displacement of the drive shaft 22 in real time. That is, the potentiometer 40 measures the rotational angle of the driving shaft and the opening / closing shaft connected thereto.

At this time, the drive shaft 22 and the potentiometer 40 may be coupled by the coupling 42, but the present invention is not limited thereto.

The wireless transceiver 90 receives the target angular displacement of the opening and closing shaft 12 transmitted from the PC or the mobile device and transmits the current angular displacement detected in real time by the potentiometer 40, (Not shown).

The wireless transceiver 90 has a configuration for wirelessly controlling the operation of the driving motor 30 and includes a target rotation angle displacement which is a target value of the opening and closing shaft 12 transmitted from a manager's PC or a mobile device Receives data, processes the data, processes the current angular displacement, which is the current value sensed by the potentiometer 40, and transmits the data.

In addition to controlling the drive of the drive motor 30, if the limit switch 60 is operated in an emergency and the drive motor 30 stops, a warning signal may be transmitted to the PC or the mobile device have. Therefore, the manager can open and close the valve of the present invention, precise flow control, and recognize the abnormal operating state from a remote or wireless manner via an app on a PC or a mobile device.

Next, the microcomputer will be described.

The microcomputer 300 corresponds to a control means for controlling the operation of the potentiometer 40, the driving motor 30 and the limit switch 60. The microcomputer 300 may be provided in the form of a PCB, A means for inputting the target rotational angular displacement is built in. For reference, the micom may be attached to an arbitrary position in the housing.

The target rotational angular displacement input means may be input in a digital manner or in an analog manner.

When the target rotational angular displacement is inputted, the current rotational angular displacement of the drive shaft 22 detected by the potentiometer 40 in real time is compared with the current rotational angular displacement, and the drive motor 30 is controlled to be driven until the same is obtained.

When the target turning angle of the opening and closing shaft 12 is inputted, the microcomputer 300 controls the driving motor 30 until it becomes equal to the current rotational angle displacement of the driving shaft sensed by the potentiometer 40, The limit switch 60 is operated when the rotational angular displacement or the driving angle becomes 0 degree or 90 degrees, respectively, so that the limit switch 60 is operated And controls the motor 30 to stop operating. The detailed control process will be described later.

The servo amplifier 200 causes an exciting current to flow so that the driving motor 30 is operated by a command received from the microcomputer 300.

Next, the cam and the limit switch will be described with reference to Figs. 6 and 7. Fig. 7 is a plan view showing the cam and limit switch structure of the present invention.

The cam 50 has a cylindrical shape, and the driving shaft 22 and the opening and closing shaft 12 are coupled to each other while a pair of protrusions are formed on the outer circumferential surface.

Specifically, the cam 50 is provided between the lower end of the drive shaft 22 and the opening / closing shaft 12, and a two-stepped projection 90 degrees apart from the outer circumferential surface of the drive shaft 22 and the opening / have.

As shown in the figure, one of the protrusions has a first protrusion 52 formed on the upper side of the cam 50 and a second protrusion 54 formed on the lower side of the cam 50, As shown in FIG.

Two limit switches 60 are vertically disposed at two sides of the cam 50. The first limit switch 62 is provided at the same height as the first protrusion 52, (64) are provided at the same height as the second projections (54).

Accordingly, when the cam 50 rotates as the drive shaft 22 rotates, the first protrusions 52 or the second protrusions 54 rotate to touch the limit switches 60, . The operation of the limit switch 60 will be described later in detail with reference to a circuit diagram.

In addition, the configuration of the present invention is a form in which all the configurations can be accommodated in a separate housing 80.

A lower plate 70 is fixed to the upper surface of the upper bracket 14 and an intermediate plate 72 is disposed at a predetermined height above the lower plate 70. A predetermined height So that the upper plate 74 is disposed. At this time, the plates are supported while being supported by a plurality of support beams 76.

The cam 50 is provided on the lower plate 70 so as to allow the opening and closing shaft 12 to pass through the opening and closing shaft 12 and to connect the opening and closing shaft 12 and the drive shaft 22, The limit switch 60 may be disposed at each position.

A driving motor 30 and a reduction gear box 20 are installed on the intermediate plate 72. A driving shaft 22 of the reduction gear box 20 penetrates the intermediate plate 72 to rotate the opening / 12). The upper end of the drive shaft 22 is coupled to the potentiometer 40 by a coupling 42.

A potentiometer (40) may be provided on the top plate (74).

Since the potentiometer 40, the driving shaft 22, and the opening and closing shaft 12 are disposed on the same axis line and interlocked as described above, accurate angular displacement detection is possible.

Hereinafter, the operation of the present invention will be described in more detail with reference to FIGS. 8 and 9. FIG. FIG. 8 is a flowchart showing the control process of the present invention, and FIG. 9 is a diagram showing a limit angle sensing circuit of the present invention. 9 (a) shows a case where the drive motor rotates normally, and Fig. 9 (b) shows a case where the drive motor rotates reversely.

The limit angle sensing circuit includes a power supply line 65 in which the drive motor 30 is located, a first branch line 66 branched from the power supply line 65 and in which the first diode Dl is located, A first limit switch 62 which can be switched-connected to the power supply line 65 or the first branch line 66, a second branch line 67 branched from the second branch line 65 and in which the second diode D2 is located, And a second limit switch 64 that can be switched-connected to the power supply line 65 or the second branch line 67. [
When the manager inputs a desired opening / closing value (target rotational angular displacement or target value) of the opening / closing ball, the microcomputer 300 drives the driving motor 30.

The driving motor 30 is decelerated through the reduction gear box 20 to rotate the opening / closing shaft 12 connected to the driving shaft 22 to open / close the opening / closing ball as desired.

At this time, the potentiometer 40 interlocked with the driving shaft 22 senses the rotational angle displacement of the current opening and closing shaft 12 or the driving angle of the driving shaft 22 in real time, and the microcomputer detects the current rotational angle displacement If the inputted target rotational angular displacement values are equal to each other or are the same, the drive motor 30 is stopped to complete opening and closing. Of course, the tolerance can be set for comparison, and it can be stopped if the tolerance is within that range.

Here, the limit switch 60 is for stopping the drive motor 30 in an emergency situation where the drive motor 30 can not be stopped due to an unexpected failure of the drive motor or the microcomputer and continues to be driven.

The microcomputer 300 controls the driving motor 30 until the target rotation angle of the opening and closing shaft 12, that is, the opening and closing angle, is equal to the current rotation angle displacement of the drive shaft sensed by the potentiometer 40, (12) interlocked with the drive shaft (22) sensed in real time by the potentiometer (40) via the drive shaft (90) or the drive angle of the drive shaft (22) The limit switch 60 is operated to stop the operation of the drive motor 30 when the limit angle becomes 0 degree or 90 degrees.

9, the limit switch 60 is composed of a first limit switch 62 at the upper end and a second limit switch 64 at the lower end, when the cam 50 rotates in the forward direction (clockwise direction) as shown in FIG. 5A, when the first cam 52 rotates 90 degrees beyond the target angular displacement due to an unexpected failure, the first protrusion 52 pushes the first limit switch The first limit switch 62 is switched to the first branch line 66 to turn off the current of the limit angle sensing circuit by the first diode D1, The motor 30 is stopped.

Conversely, when the cam 50 rotates in the opposite direction (counterclockwise) as shown in FIG. 9 (b) and the second projection 54 turns on the second limit switch 64 (red) when the angle reaches 0, The second limit switch 64 is connected to the second branch line 67 and the current of the limit angle sensing circuit is cut off by the second diode D2 to stop the drive motor 30. [

The power supply 400 supplies power to the driving motor 30, the wireless transceiver 90, the servo amplifier 200, the microcomputer 300, and the limit angle sensing circuit for sensing the limit angle.

In another embodiment of the present invention, the microcomputer 300 may include a wireless transceiver 90. In this embodiment as well, the wireless transceiver 90 is configured to wirelessly control the operation of the driving motor 30, and the wireless transceiver 90 includes the opening / closing shaft 12, which is included in the microcomputer, Which is a target value of the target angular position, and processes the data, and transmits the current angular displacement, which is the current value sensed by the potentiometer 40, as data.

In addition to controlling the drive of the drive motor 30, if the limit switch 60 is operated in an emergency and the drive motor 30 stops, a warning signal may be transmitted to the PC or the mobile device have. Therefore, the manager can open and close the valve of the present invention, precise flow control, and recognize the abnormal operating state from a remote or wireless manner via an app on a PC or a mobile device.

For reference, in another embodiment, it may be attached to the upper surface of the housing 80 as shown in FIG. 4, or it may be installed at any other location inside the housing rather than the inner side of the support beam 76.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: valve body 12: opening / closing shaft
14: upper bracket 16: lower bracket
20: reduction gear box 22: drive shaft
30: drive motor 40: potentiometer
42: coupling 50: cam
52: first projection 54: second projection
60: limit switch 62: first limit switch
64: second limit switch 70: lower plate
72: intermediate plate 74: upper plate
76: support beam 80: housing
90: Wireless transceiver 200: Servo amplifier
300: Microcomputer 400: Power supply
D1: first diode D2: second diode

Claims (5)

A valve body (10) having an opening / closing ball for opening and closing a flow path therein; An opening / closing shaft (12) coupled to an upper portion of the opening / closing ball; A reduction gear box (20) having a reduction gear set therein and a lower end of a drive shaft (22) penetrating up and down is interlocked with the opening and closing shaft (12); A driving motor 30 for transmitting a forward or reverse driving force to the reduction gear box 20 to open and close the valve by opening and closing the ball through the opening and closing shaft 12; A potentiometer (40) coupled to an upper end of a drive shaft of the reduction gear box (20) to sense a rotational angular displacement of the drive shaft (22) in real time; A cam 50 provided between the lower end of the driving shaft 22 and the opening and closing shaft 12 and having a two-stepped protrusion 90 degrees apart from the outer circumference of the driving shaft 22 and the opening and closing shaft 12; A pair of limit switches (60) provided on one side of the cam (50) in two stages; A wireless transceiver 90 for receiving a target rotational angular displacement of the opening and closing shaft 12 transmitted from a PC or a mobile device and for transmitting a current rotational angular displacement sensed in real time by the potentiometer 40; When the target turning angle of the opening and closing shaft 12 is inputted, the driving motor 30 is controlled until the current turning angle of the driving shaft 22 sensed by the potentiometer 40 becomes equal to the current turning angle of the driving shaft 22, Closing axis 12 detected by the potentiometer 40 in real time, and when the rotation angle displacement or the driving angle becomes a limit angle of 0 degree or 90 degrees, the limit switch 60 is turned on, A microcomputer 300 for controlling the operation of the driving motor 30 to be stopped; A servo amplifier 200 for causing an exciting current to flow so that the driving motor 30 is operated by a command received from the microcomputer 300; And a power supply 400 for supplying power to the driving motor 30, the wireless transceiver 90, the servo amplifier 200, the microcomputer 300, and the limiting angle sensing circuit for sensing the limiting angle. Including,
The limit angle sensing circuit includes a power supply line 65 in which the drive motor 30 is located, a first branch line 66 branched from the power supply line 65 and in which the first diode Dl is located, A first limit switch 62 which can be switched-connected to the power supply line 65 or the first branch line 66, a second branch line 67 branched from the second branch line 65 and in which the second diode D2 is located, And a second limit switch (64) switchable with the power supply line (65) or the second branch line (67). The method according to claim 1,
The limit switch 60 is composed of a first limit switch 62 at the upper end and a second limit switch 64 at the lower end and the protrusion of the cam 50 is connected to the first protrusion 52 at the upper end, Two protrusions 54,
When the cam 50 rotates in the forward direction and the first protrusion 52 turns on the first limit switch 62 when the first protrusion 52 reaches 90 degrees, the first limit switch 62 is turned on the first branch line 66 ), The current of the limit angle sensing circuit is interrupted by the first diode (D1), the drive motor (30) is stopped,
When the cam 50 rotates in the reverse direction and the second projection 54 turns on the second limit switch 64 when the angle reaches 0 degree, the second limit switch 64 is turned on the second branch line 67 And the electric current of the limiting angle sensing circuit is cut off by the second diode (D2), so that the driving motor (30) is stopped. 3. The method according to claim 1 or 2,
The micom 300 can control the driving motor 30 wirelessly from a PC or a mobile device remotely through the wireless transceiver 90 and the limit switch 60 is operated so that the driving motor 30 And a warning signal is sent to the PC or the mobile device when the vehicle is stopped. A method of precisely controlling the flow rate of an electrically operated ball valve by radio using the electrically operated ball valve capable of precise flow control by radio of claim 1,
A first step of inputting a desired opening / closing value of the opening / closing ball;
A second step of operating the drive motor (30);
A third step in which the opening and closing shaft 12 rotates;
A fourth step in which the potentiometer (40) senses the rotational angular displacement of the drive shaft (22) interlocked with the opening / closing shaft (12) in real time;
A fifth step of comparing whether the target rotational angular displacement, which is a target value, coincides with a current rotational angular displacement which is a current value;
Returning to the second step when the target value does not match the current value, and stopping the drive motor (30) when the target value and the current value match;
A seventh step of wirelessly receiving and transmitting the driving angle of the driving shaft (22) coinciding with the current rotational angular displacement sensed in real time in the fourth step;
An eighth step of confirming whether the current rotational angular displacement has reached a limit angle; And
And returning to the second step when the current angular displacement has not reached the limit angle, and stopping the drive motor (30) when the current angular displacement reaches the limit angle Wherein the control unit is operable to control the flow rate of the electric ball valve. 5. The method of claim 4,
Wherein the limit angle is 0 degrees or 90 degrees. ≪ Desc / Clms Page number 20 >

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