CN2040207U - Electric valve controller - Google Patents

Abstract

The utility model belongs to the instrument and meter for automation class, which is composed of electrically-operated systems, a position-limit mechanism and a controlling circuit. The utility model is mainly characterized in that a direct current electric motor is used to drive, and the basic element of the controlling circuit is two position switches, two diodes and a double-pole double-throw switch. The circuit is particularly simple, and the utility model is convenient to be made into a miniaturization device which combines the driving and the controlling. If the switch is extracted, remote control can be performed, and automatic control can be realized with appropriate electronic circuits. The device is also convenient to be made into explosion-proof construction and electric control valve used in the explosive dangerous environment. The device can also be used to control the devices of air door, sluice, etc.

Description

Electric valve controller

The utility model belongs to the instrument and meter for automation class.

General electric valve control gear is that an Electric actuator and a controller are used, or an electric actuator and an operator are used.In existing product, above-mentioned be used both are splits, structure and circuit more complicated, not only cost is higher, and very inconvenient when using under the environment of some specific (special) requirements.When for example using in the environment of explosion risk is arranged, the both must have explosion-proof performance, needs with two explosion-resistant enclosures, and it all is disadvantageous at this moment making and using.

Task of the present utility model is the simple electric valve control gear of a kind of circuit of design, controller and Electric actuator are combined as a whole, but not only the opening and closing of control valve on the spot of a switch on the utilized device, and can an external simple switch or circuit valve is carried out remote control or control automatically.

This device uses direct current motor to cooperate reducing gear to drive the valve rod of valve, the energising direction of the polarity switching change motor that the unlatching of valve and closed these two opposite actions are formed by a double-pole-double-throw switch or by the relay of two groups of changeover contacts realizes, the location of valve rod is cooperated with two position limit switches and braking device by the cam mechanism on the live axle finishes, when valve rod arrived a certain limit position, cam touched position limit switch and makes the motor outage and stall.After making motor turn to the limit position outage along certain direction, the reverse of oppositely switching on, two position limit switches are all distinguished diode in parallel, and the polarity of diode is all pointed to (or dorsad) motor.The basic circuit principle of this device as shown in Figure 1.

In the accompanying drawing 1 under the position shown in the double-pole-double-throw switch K3, the direction that motor M drives cam W rotation as shown by arrows, when cam touches position limit switch K2 it is disconnected, the motor also braking that has a power failure, cam just rests on this position, makes valve be in opening state.Afterwards, if K3 is pushed the another location, though K2 is temporary transient the disconnection, electric current can reverse motor and cam by D2, and K2 is resetted, and when cam shake-up K1 disconnected it, the motor stall made valve be in closed condition.If K3 is dialled get back to shown position again.Then owing to the effect of D1, cam can rotate along the diagram direction of arrow again, up to touching K2, make valve opening.So, the state of valve just depends on the position of K switch 3.K3 also can be replaced by a relay with two pairs of changeover contacts, and adhesive and release by other circuit comes control relay get final product control valve.

The utility model compared with prior art, its advantage is that circuit is fairly simple, the used element of control circuit is less, simple to operate, simultaneously, the starting torque of direct current motor is big, characteristic is hard, and is littler than the squirrel-cage Wechselstrommotor volume of same performance, helps making the electric valve control gear to reduce volume and weight, reduce cost and make it integrated, manufacturing and use when being convenient to special circumstances and needing.This device not only can control valve, also can control the displacement of other devices, for example air door, gate etc.

An embodiment of the present utility model as shown in Figure 2, it the expression explosion-proof type electric valve control gear the electrical principle schematic representation.The effect of motor M, cam W, position limit switch K1 and K2, diode D1 and D2 is identical with accompanying drawing 1 among the figure, two groups of changeover contacts of relay J have replaced the effect of the K switch 3 in the accompanying drawing 1, the coil of relay J is the load of triode BG, just can make the J adhesive during BG conducting, otherwise discharge, BG is driven by the output triode of optical coupler GO, the input current of GO is by outside connected switch K3 or the control of other forms of circuit, as can be seen, when K3 is closed, GO has input current to pass through, and its output triode makes the BG conducting, the J adhesive; Otherwise when K3 disconnected, J discharged; Like this, get final product opening and closing of control valve by K3.Transformer B among the figure, rectifier bridge Q and capacitor C establish in order to make this device use Alternating Current Power Supply.Because this example is to design by requirement of explosion proof, in order to make operating switch K3 or other control circuit can adopt the essential safe type circuit of simple in structure and performance safety, in this circuit by resistance R 1 and R2, reference diode D3 and D4 have formed diode safety barrier, the secondary shielding quarantine measures of having taked of transformer B, make tenminal block 3,4,5 is essential safe type, can external essential safe type circuit, 3 and 4 ends provide intrinsically safe power supply for external circuit, 3 and 5 is the essential safe type control input end, among the figure dot and dash line square frame with interior circuit arrangement in a flame-proof enclosure, the output shaft of driving mechanism stretches out explosion-proof shell and controls valve outward, and terminal 1 and 2 is an ac power supply terminal.Example adopts the electric valve control gear of the utility model design and manufacturing as can be seen thus, and obvious superiority is arranged in some cases.

Claims (1)

1, a kind of electric valve control gear, position-limit mechanism, control circuit and shell that driving mechanism, cam and the position limit switch of being made up of motor and retarder formed constitute.It is characterized in that: motor adopts direct current motor.DC electrical source through one by supplying with motor behind double-pole-double-throw switch or the polarity switching that has the relay of two pairs of changeover contacts to constitute; On two power lines of motor, be connected in series a position limit switch respectively, each position limit switch again and connect a diode, the conducting direction of two diodes all points to or equal motor dorsad; Cam is between two limit positions the time, and two position limit switches all are conductings, when camming movement during to a certain limit position, is in this locational position limit switch and is touched and not conducting, and the position limit switch on another limit position is conducting.