KR20010009493A - Flow control valve with Digital control and Communication function - Google Patents

Abstract

PURPOSE: A flow control valve is provided to secure cost reduction and safety by using a digital driving controller having a remote control and monitor function as well as a flow control function of a valve. CONSTITUTION: A flow control butterfly valve consists of a valve body(1), a driving controller(2), fluid inlets(3), a pressure sensor connector(5), a pressure sensor(6), a micro-controller(7), a driver(8) and a remote control and monitor communication line(9). The pressure sensor, the micro-controller and the driver are formed into a single unit as the driving controller(2). A microprocessor of the micro-controller calculates different pressure and flow from the data of the pressure sensor and compares the data with inherent set value to determine compensation to desired flow. The microprocessor sets the RPM(Revolution Per Minute) of a motor by pulse width modulation and controls the position of a valve. The valve is adjusted in flow thereby. All data of the microprocessor are connected to a DDC(Direct Digital Controller) and an asynchronous communication line through the remote control and monitor communication line(9). The data control and monitor the entire system of a main computer. The two fluid inlets(3) are mounted at both sides of the valve body to measure the pressure of a pipe. The pressure sensor connector is set between the fluid inlets and the driving controller.

Description

Flow control valve with digital control and communication function

The present invention relates to a flow control valve having a digital control and communication function, and more specifically, it is possible to remotely control and self-diagnosis by the asynchronous communication method, each unit (Unit) of the valve individually unique control characteristics The present invention relates to a flow control valve having a required flow control function and having digital control and communication function for total control of the entire system, real time communication, and data integration.

A general flow control valve is an electrical control method using a pressure difference, and is a method of correcting to have an equivalent ratio or a linear flow rate characteristic by using a link mechanism or an electric bridge circuit. It is a simple adjustment function based on the setting value of the valve itself using a motor, and is limited to the flow rate control of individual valves, and therefore, an expensive separate control and monitoring system is required for efficient control and management of the system. In addition, a pressure sensor is installed in the valve body or in the pipes before and after the valve for differential pressure measurement.If a pressure sensor is installed in the valve body, it is difficult to accurately measure the flow rate due to fluid vortex phenomenon before and after the valve. Experts require disassembly of the valve body. In addition, in the case of installing the sensor in the pipe, the site construction and calibration work for the sensor installation is made separately. There are other valves utilizing servo motors, stepping motors or various mechanical reduction devices, but there are problems that are complicated and expensive to use in general industrial sites.

The present invention was devised to solve the above problems, and its purpose is to control the flow rate of the valve object, as well as to easily install, maintain and maintain the site, and to provide a simple digital control system with remote control and monitoring functions. By developing a valve using the method drive control device, it is intended to secure cost reduction and safety and maintain efficiency in general industrial sites.

In the flow control valve used for opening and closing and controlling the flow rate of cold water, hot water and steam in the industrial field, a pressure controller, a microcontroller performing direct digital control (DDC) of the valve object and a drive unit for opening and closing the valve It is composed of a valve drive control device provided in the microcontroller 7 and is required for the overall control such as software for flow control, pressure calculation and flow rate input / output integration program with information obtained from the pressure sensor 6 in the microcontroller 7. In addition to the flow rate control, the software can be connected to the direct digital controller 17 and the asynchronous communication line 19 to control up to 32 valves from one direct digital controller 17 through digital remote control and monitoring. In addition, the drive unit 8 is a flow control butterfly valve driving device using an AC motor, a spur gear and a worm gear. It is finished to have.

1 is a block diagram of the drive control device of the flow control butterfly valve

2 is a flow control and control batch operation

3 is a block diagram of a microcontroller;

4 is a configuration diagram of a communication line for remote control and monitoring

5 is a drive device using a worm gear (Worm) of the flow control butterfly valve

<Explanation of symbols for main parts of drawing>

(1) Valve body (2) Driving control device

(3) Fluid inlet (5) Pressure sensor connection

(6) Pressure sensor (7) Microcontroller

(8) Driver (10) Microprocessor

(16) Host Computer (17) Direct Digital Controller

(19) Asynchronous communication line (20) Parallel connection

(21) AC Motor (22) Worm Gear

(23) Spur Gears (24) Manual Handles

25 valve disc

The construction of the embodiment of the present invention for achieving the object as described above and the problem for eliminating the drawbacks of the present invention will be described in detail with reference to the accompanying drawings.

The present invention has developed a drive control device (2) consisting of a pressure sensor (6), a controller equipped with a micro-controller (7) and a drive unit (8) integrally to control the flow rate of the valve body as well as asynchronous communication Parallel connection with Direct Digital Controller (DDC, 17) by the method makes remote control and monitoring of the whole system easy.

The pressure sensor 6 is installed in the drive control device 2 of the valve, and is installed in the drive control device 2 through a hose or tube by installing only the pressure inlet 3 for pressure measurement at an appropriate position on the upstream and downstream sides of the pipe. Easy connection and maintenance work by connecting.

(Example)

Referring to the configuration of the drive control device of the flow control butterfly valve Figure 1 describes the present invention taking the case of the flow control butterfly valve as an example, the valve body (1), the drive control device (2), which is installed on the pipe Pressure sensor fluid inlet (3), pressure tube (5), pressure sensor (6), control microcontroller (7), drive unit (8) and remote control in the connection tube (4) and drive control unit (2) Control and monitoring communication line (9). The pressure sensor 6, the microcontroller 7, and the driver 8 are configured as one unit to form the drive control device 2. Intrinsic flow rate characteristic set value according to the pressure change of the valve in which the differential pressure and flow rate are calculated and input in the microprocessor (FIGS. 3 and 10) built in the microcontroller 7 using the differential pressure data measured from the pressure sensor 6 In contrast to this, a correction program using a flow characteristic algorithm is used to set a correction amount to a desired flow characteristic. Flow control of the electronic valve opening / closing control method for instructing the motor rotation amount and proper control of the valve position is performed by pulse width modulation according to the set amount, and all information of the microprocessor 10 is illustrated in FIG. 4. As can be seen from the remote control and monitoring communication line 9 through the direct digital controller 17 and the asynchronous communication line 19 is connected to the entire system remote control and monitoring in the main computer 16 is possible. Two fluid inlets (3) are provided for pressure measurement on both sides of the valve body (1). The pressure sensor connecting portion 5 attached to the fluid inlet 3 and the drive control device 2 is connected by a connecting tube 4. Figure 2 shows a simplified flow control and control batch operation diagram.

In addition, as shown in the configuration diagram of the microcontroller of FIG. 3, the microprocessor 10, which is a main component of the microcontroller 7, allows communication and wheeled bus programs and control software logic to be configured. The main software of the microprocessor 10 is "asynchronous communication protocol implementation algorithm", "input / output logic algorithm", "pressure for flow calculation, area calculation database structure", "self-diagnosis logic", "communication logic", "proportionality" Calculus control algorithm "," pressure differential input logic "," output pulse width division logic "," user program partial logic "," nonvolatile semiconductor memory (EEPROM) power failure, recovery logic "," logic for position control sensor ", etc. It consists of. The microcontroller 7 incorporating such a program has the following basic selection functions.

<CTL> 11: Control signal input terminal

-Current control: 4 mA to 20 mA

-Voltage control: 0 V ~ 10 V

<CTL Type> (12): It is used to set the control signal and select the current type and the voltage type.

<AUTO SET> (13): This function is used for initial setting and automatically recognizes the "initial and end" range.

<MODE SET> (14): The control mode is selected by the following two modes.

Heating mode (+)

It is fully closed at 4 mA (0 V) input and fully open at 20 mA (10 V) input.

-Cooling Mode (-)

It operates fully open at 4 mA (0 V) input and fully closed at 20 mA (10 V) input.

〈LOCAL / REMOTE〉 (15)

-If <Remote> is selected: All control and status are monitored from the host computer by direct communication with the digital controller.

-If <Local> is selected: All controls are performed automatically and manually by direct digital controller or field controller.

In addition, the configuration of the communication line for remote control and monitoring as shown in the configuration diagram of the communication line for remote control and monitoring in Figure 4 connects the main computer 16, the direct digital controller 17 and the field valve 18 It consists of an asynchronous communication line 19. The main computer 16 can be connected to a plurality of direct digital controllers 17 and control 1 to 32 valves from one direct digital controller 17. The direct digital controller 17 has modules such as operator management, communication management, event processing, system status management, system setting, point registration, control and monitoring, continuous monitoring, control file management, remote system management, communication status monitoring. Equipped with major modules. The direct digital controller 17 and each of the valves 18 in the field are connected in parallel 20 to the asynchronous communication line 19 and in the microcontroller 7 of the valve 18 with the unique control characteristics for each valve. The central control is made possible by processing the data according to the feedback.

In addition, the drive unit 8 allows the valve to be precisely opened and closed according to the flow rate control and the torque value of the rotational torque of the shaft can be transmitted without difficulty, and the maintenance structure is simple by using inexpensive and easily acquired parts. .

In addition, as shown in the example of the drive device using a worm gear of the flow control butterfly valve of Figure 5, as an example of the flow control butterfly valve drive device using an AC motor and a two-speed worm gear, in the AC motor 21 The power of the deceleration is reduced through the spur gear 23 and the worm gear 22 to control the opening and closing degree of the valve disc 25. In some cases, the manual handle 24 is installed so that the valve can be opened and closed manually.

(Variation of invention, application example)

The present invention related to the above is not limited to the embodiment, and structural changes, design changes, and the like are all included in the present invention, and the pressure sensor 6 and the control unit in configuring the drive control device 2 of the flow regulating valve are included. All microcontrollers 7 on one board, modified or modified microprocessors 10 that add or remove software that changes only management items according to the user's needs, all types of flow control valves, not just butterfly valves The drive control device 2 of the present invention can be used, and the drive part can be modified according to the type, capacity and size of the valve, and the type of motor (DC motor, servo motor, stepping motor, etc.) Gears, spur gears, etc.) and combinations (direct connection, rack and pinion, use of links, etc.) may be applied.

The present invention is a control system and device for a valve, which is limited to the simple opening and closing function of the flow control valve, such as steam, hot water, or the flow rate control of the valve body in the conventional industrial field to form a group of valves as well as valve group By the communication method, remote control and real-time communication data exchange method are possible, and the valve object is endowed with inherent control characteristics to perform flow control and self-failure diagnosis, preventing malfunction of the valve object in advance. Many industrial effects such as mitigation of possible mechanical shock, remote safety control by communication method in emergency, information data in case of momentary power failure during operation, immediate execution of information processing during power recovery, replacement effect of bypass device, etc. It is a very useful invention that saves cost and ensures safety.

Claims (3)

In the flow control valve used for opening and closing and controlling the flow rate of cold water, hot water and steam in the industrial field, It consists of a valve drive control device (2) having a pressure sensor (6), a microcontroller (7) for performing direct digital control (DDC) of the valve object and a drive unit (8) for opening and closing the valve as a unit, Digital flow control valve with digital control and communication function, characterized in that the digital control by flow control and communication method. The method of claim 1, The information obtained from the pressure sensor 6 in the microcontroller 7 includes software for flow control, related software necessary for total control such as pressure calculation and flow input / output integration program, and the flow control as well as direct digital controller ( 17) and the asynchronous communication line (19) connected to the digital control and communication function characterized in that the digital remote control and monitoring and self-diagnosis is possible from one direct digital controller (17) up to 32 valves Flow control valve. The method of claim 1, The drive unit (8) has a flow control valve with a digital control and communication function, characterized in that it has a flow control butterfly valve drive device using an AC motor, a spur gear and a worm gear.