CN2844985Y

CN2844985Y - Electric valve controller

Info

Publication number: CN2844985Y
Application number: CNU2005200983409U
Authority: CN
Inventors: 周祖德; 李方敏; 徐成; 刘泉
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Science and Engineering WUSE; Wuhan University of Technology WUT; Wuhan University of Science and Technology WHUST
Priority date: 2005-10-13
Filing date: 2005-10-13
Publication date: 2006-12-06
Anticipated expiration: 2015-10-13

Abstract

The utility model relates to an electric valve controller based on embedded type technology. The utility model is composed of a system power supply, an embedded type master control unit MCU, a nonvolatile memory and a peripheral circuit, and is characterized in that a control output line of the MCU is connected with a switch of the controlled valve, and a commutation device through the valve control circuit; a data line of the MCU is connected with the switch of the controlled valve and the commutation device through a phase sequence and an open-phase testing circuits, and is also connected with an electric device of the controlled valve through a state and a failure testing circuits. Because the utility model adopts the electric valve controller with the embedded type technology, the utility model has the characteristic that an embedded type system is applied as the customized system in the way of acting according to actual circumstances. Compared with PLC, the utility model undoubtedly has unequalled dominance and foreground when the utility model is applied aiming at a particular product, particularly the product which can be produced in large quantity and is worth development for a long term.

Description

A kind of electric valve control device

Technical field

The utility model belongs to dynamo-electric and control field, is a kind of electric valve control device based on embedded technology specifically.

Background technology

Use electric device to drive the valve closure or openness in the electric control valve, comprise in the electric device three phase alternating current motor, mechanical deceleration device, motor just/reverse moment measuring device, motor overheating pick-up unit, the valve ON/OFF condition checkout gear etc. that puts in place of crossing, the principle of work of electrically operated valve is as shown in Figure 1.But the industry valve is often as a control subsystem in the industrial system, therefore, the control of valve required unusual different with the commercial Application system.Valve control power mainly adopts electronic and the hydraulic pressure dual mode, and the logical gate of control system then mainly is: adopt the relay switch logic for the simple requirements occasion; The demand occasion comparatively complicated for logic then adopts industrial PLC (programmable logic controller (PLC)).

More than two kinds of logic control systems also be mode general, traditional, that always be widely used for many years in industry member, their technology maturations, properties of product are stable, reliable operation, technical support guarantee.But, analyze and find:

(1) adopts the relay switch logic, can only realize simple control, be difficult to realize that function can not satisfy the development day by day of automaticity to the requirement of valve control subsystem such as time-delay, communication, digitizing setting and demonstration etc.; Besides, adopt the control system volume of relay switch logic big, generally need make a switch board, volume is big, power consumption is big, cost is not low.Although the switch board of relay switch logic has the history of successfully using decades in industry member, but it is the outmoded control method of a kind of technology, all signs show that it no longer is the control technology main flow that industry member is used already, and the possibility that is replaced fully with other method is arranged.

(2) PLC be development in recent years rapidly, a kind of control method of extensively adopting of technology maturation, industry member.The PLC structural arrangements is flexible, and the module of provision in set is selected many, is easy to constitute an industrial control unit (ICU).And PLC uses easily, field-programmable, the convenient use.These facilities make the user when making up the commercial unit of a robotization, notice can be placed on the others of equipment, and the design of steering logic system, formation, manufacturing etc. almost can be considered, just then how to match PLC and on-the-spot the use both can.These advantages of PLC have brought a lot of facilities for really Industry Control circle, especially for the application that is pressed for time, usage quantity is few, fields such as indefinite process are developed in product research, be subjected to the favor of industry member deeply, obtained very widely using in industry member, even in some notions, formed best Industry Control and use PLC exactly.

But careful thinking is not difficult to find, PLC is actually a class general purpose controller of design, make things convenient for the people of different application occasion, even be ignorant of to such an extent that how to go to manufacture and design under the situation of controller, and can obtain and use an advanced in performance controller fast, go to solve the device control problem of oneself.Because PLC is general, rather than manufactures and designs at each application specific, so, use system that the PLC that matched and module thereof constitute at each and always have redundant or not enough on some resources, the index, cause waste or shortcoming; Because PLC is the product that is merging others' technology and intellecture property, comprising others' technology and surplus profit in the PLC price again, used, select for use PLC that cost of products is increased, cause the product price competitiveness to descend or profit reduces.

For controlling the size big and needing the product of long-term production and development, make controller if rely on PLC, then it is unfavorablely obviously easily seen especially.

(3) no matter adopt the relay switch logic, still adopt PLC, its control section of formed product is difficult to form individual character, the style of oneself, sets up the product brand of oneself.The relay switch logic is subjected to the restriction of its arithmetic capability, and the function that can realize is limited, even oneself its device control of product is had new idea and intention, the relay switch logic also is difficult to competent to its realization, or expense is bigger.This also is one of the restriction of relay switch logic and reason on the verge of being replaced.Though PLC does not have problems in these areas, the new product that constantly provides almost can satisfy the various differences of industrial application and new demand.But PLC is a general off-the-shelf, and after being used for constituting the core of a control system, it has fixed its form and structure, and remaining just simple PLC uses problem.Essence in convenient and simple behind is, real one's own technological component reduces in the control of product system, and others also can accomplish equally easily.Consequently, in the product of oneself still can not by to the long-term understanding of own product, accumulation, perfect, improve, in product, fully use the original knowledge of oneself, be formed with individual character, the product of style arranged, establish product brand.

In this, particularly important concerning a product that on strategy, needs to seek long-run development and enterprise.Otherwise, minimum controller at product means that its competitive power of product is more and more lower aspect this, with advanced, development for no reason at all.See also from the strategic development direction of external esbablished corporation and product to confirm this point that real ripe and rising product does not rely on PLC.If an enterprise or a product must depend on the formation that PLC just can finish its control system conversely speaking,, can only illustrate that this product also has the space of technical development, or the technical capability of this enterprise is limited.

Embedded system is technical fields such as computing machine, communication, electronics, the automatic control products of common development in recent years.An embedded system, one is embedded in equipment often, or computer system in the commodity, this computer system for equipment or commodity the function that should finish control and service are provided, be the ingredient of equipment or commodity.The characteristics of embedded system are application-oriented, under the prerequisite that satisfies concrete each application requirements, and the simplest and the clearest application systems of configuration aspects such as design hardware, software.Embedded system should be at each different concrete application, manufactures and designs dedicated system from hardware, software for it " cutting the garment according to the figure ".Embedded system these fundamental property and characteristics be that concrete each application system makes up performance the best, and the minimum nonshared control unit of cost become possibility.Simultaneously, be easy to form and realize the product of own speciality, style, individual character, protect the intellecture property of oneself, also help accumulating, creating the brand of oneself.Embedded system is applied to the existing countless successful examples in control field, and the universal and widespread use of smart machine, automation equipment has profoundly illustrated this point.In fact, the inner structure of PLC also is an embedded system, only because PLC is not at concrete certain application, but come out general control system is abstract, find out their general character, make general as far as possible product, the more applications occasion can be applied mechanically, to share the more market share.

Summary of the invention

The purpose of this utility model provides a kind of progressively replacement and is now using the relay switch steering logic and be the control core system based on PLC, and progressively form the electric valve control device based on embedded technology of tandem product, to overcome above-mentioned deficiency.

To achieve these goals, the utility model is made of system power supply, embedded centralized control unit MCU, nonvolatile memory and peripheral circuit, be characterized in: MCU control output line is connected by switch, commutation device in valve controling circuit and the control valve, the MCU data line is connected by switch, commutation device in phase sequence, lack detection circuit and the control valve, and the MCU data line is also by state, failure detector circuit and be connected with electric device in the control valve;

Above-mentioned MCU also is connected with local operation, display device by the man-machine interface circuit in this locality;

Above-mentioned MCU also is connected with main system controller by the communication interface circuit;

Above-mentioned MCU also is connected with operated from a distance, display device by remote interface circuit.

Because the utility model adopts the electric valve control device of embedded technology, make the utility model embedded system with " cutting the garment according to the figure ", characteristics for the applied customization system, using at a specific product, particularly, there be not advantage and the prospect incomparable of being suspected to have with PLC at the product of a large amount of productions and worth long-run development.The utility model can be connected with electric device with existing all kinds of valve controls, replaces the controller of being made up of relay switch logical OR PLC; Can monitor the three-phase alternating-current supply phase sequence, and make the control corresponding adjustment automatically; Can reach position, valve and close fault and state such as put in place and detect crossing moment, locked, motor overheating, power supply phase shortage, valve, and make corresponding protection control; Support on the spot, long-range and three kinds of control modes and the information state indication of communicating by letter.

Description of drawings

Fig. 1 is the principle of work block diagram of electrically operated valve.

Fig. 2 is a theory diagram of the present utility model.

Fig. 3 is the utility model input circuit schematic diagram.

Fig. 4 is the utility model output circuit schematic diagram.

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.

The utility model control section has 12 general inputs (wherein 8 from electric device or remote control signal, 4 are used for local operation), 11 relays outputs, and 1 communication interface.Selection comprises that with The whole control system logic control, local operation, local state information demonstration, system's power supply, system physical line with connection terminal etc., all are integrated on the circuit board.Constructed system architecture as shown in Figure 2.

The utility model is owing to all be integrated in local operation and local demonstration, physics connection terminal on the same circuit board, and the layout arrangement of positive topological design decision local operation of its circuit board and the indication of local state also is the final product form of controller; Putting in order of its circuit board reverse side topological design decision controller physical connection terminal.

The utility model switching value input signal (see figure 3) is added to the input end of photoelectrical coupler through resistor network with signal, and the signal after photoelectric coupler isolation is delivered to the respective input mouth of micro controller.Select the NPN resistor network, then allow to insert the NPN input signal; And select the PNP resistor network, then allow to insert the NPN input signal.LED is used to indicate the state of input signal.

The control signal (see figure 4) of the utility model MCU output is amplified through driving, and directly drives relay J and LED.LED is used for the state of the local indication control signal of exporting, and relay J requires apolegamy different type and model according to output load.

The phase sequence of the utility model three-phase supply and open-phase fault detection hardware circuit are simple three road photoelectricity isolation signals transfer circuits.Deliver to the original signal of MCU input port reflection three-phase supply and need differentiate the detection that just can finish phase sequence and open-phase fault by corresponding algorithm and software.Though such scheme has increased the complicacy of software, can the simplified system hardware configuration, reduce the source of trouble of system hardware, reduce system cost.

The utility model can be controlled fluid-control valve equally, though have certain demand difference between fluid-control valve and the electrically operated valve control, the final form of controller also proposes different requirements according to practical application, can only need to change an output control hardware and get final product according to characteristics and demand separately.

The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.

Claims

1, a kind of electric valve control device, constitute by system power supply, embedded centralized control unit MCU, nonvolatile memory and peripheral circuit, it is characterized in that: MCU control output line is connected by switch, commutation device in valve controling circuit and the control valve, the MCU data line is connected by switch, commutation device in phase sequence, lack detection circuit and the control valve, and the MCU data line is also by state, failure detector circuit and be connected with electric device in the control valve.

2, electric valve control device as claimed in claim 1 is characterized in that: MCU also is connected with local operation, display device by the man-machine interface circuit in this locality.

3, electric valve control device as claimed in claim 1 is characterized in that: MCU also is connected with main system controller by the communication interface circuit.

4, electric valve control device as claimed in claim 1 is characterized in that: MCU also is connected with operated from a distance, display device by remote interface circuit.