CN1035493C

CN1035493C - Valve electric driving device

Info

Publication number: CN1035493C
Application number: CN93108667A
Authority: CN
Inventors: 王庆宪
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-21
Filing date: 1993-07-21
Publication date: 1997-07-23
Anticipated expiration: 2013-07-21
Also published as: CN1097851A

Abstract

The present invention relates to a valve electric device controlled by a computer, which is composed of a worm gear pair, clutches, a sensor, a computer, etc. which are arranged in a box body, wherein a worm gear is fixed on a hollow shaft, and the hollow shaft outputs a moment to the outside to operate a valve. A worm is hollow, the clutches are arranged at both ends of the worm, and the center of the worm is provided with the push rod; the two clutches can be linked by the push rod. The opening and the moment of the valve is measured by one sensor, and different kinds of operation can be carried out to the valve by a signal of the sensor and an external control signal.

Description

Electric device for valve

The present invention relates to a kind of valve actuator, particularly a kind of electric valve drive unit.

In the at present known electric device for valve, adopt computer control, photoelectric display, photoelectricity stroke measurment mechanism and a kind of of stress bar torgue measurement mechanism are relatively simple for structure, electric device for valve easy to use.But this Electric actuator also has the following deficiency:

The torgue measurement mechanism of this electric device for valve is by stress bar, electric bridge, compositions such as amplifier and A/D converter.Its torgue measurement is to detect the back by electric bridge to amplify, and handles through delivering to computer after the A/D conversion at last.Because the stress bar amount of deformation is very little, the signal that electric bridge detects is very faint, just can deliver to A/D converter conversion after must amplifying through a very big amplifier of magnification factor.The general electric device for valve Environmental Conditions temperature difference is bigger, electric bridge, and amplifiers etc. are interfered easily, for making its reliably working manufacture cost of just having to improve.Owing to use analog circut, all tackle sensing system generally speaking every year and do once demarcation, could guarantee its operating accuracy.The electric device for valve fitness for purpose will have man-operated mechanism so that still can operate valve when having a power failure.Its manual-electronic conversion equipment is operated two clutches with a connecting rod, and structure neither be good.

Task of the present invention provides the control of a kind of computer, adopts a sensor just can detect valve opening and output torque, the electric device for valve by worm drive when manual.

Task of the present invention is finished with following mode: worm screw is fixed on the hollow shaft, and the outside output torque of hollow shaft is operated valve.Two clutches are housed respectively at the worm screw two ends, by a push rod two clutches can be moved simultaneously, another could be closed when throwing off for one, and it is closed having only a clutch at any time at the most.There is being a spring to be pressed on the clutch on the motor shaft, when free state, making this clutch always closed.When handwheel pushed, handwheel side clutch closure made throw-out-of clutch on the motor shaft by push rod simultaneously, does not return automatically when handwheel stresses.Worm screw is hollow, and push rod passes wherein, at its two ends bearing is housed, and motor shaft side bearing and casing are slidingly matched and can move freely, and the handwheel side bearing is fixed in the sleeve, and the outer end of sleeve is fixed on the casing with a collar.A sensor is housed on sleeve, and this sensor can be a slot type light lotus root, reflecting light lotus root, Hall transducer or near switch.A sensing body is housed on the worm screw, sensor is passed in the rotation of worm screw.When device work, sensor can send a string count pulse, and computer is handled these signals according to the aperture preset value of aperture prewired circuit, is used to count valve opening.Simultaneously the computer expert crosses the pulse interval that sensor sends and calculates motor speed, can converse motor torque by rotary inertia and the velocity variations of calculating it again.Valve control moment value presets to computer with prewired circuit, realizes control to valve moment by relatively presetting moment and factored moment.The computer expert crosses sensor signal and external control signal just can carry out various operations to valve.Computer control part also has the address prewired circuit, can be used for networking control for address code of each valve establishment.

The present invention only uses a sensor can measure the aperture and the moment of valve, so electrical structure is very simple, and just can the reliable and stable work of assurance device owing to do not use amplifier and high-precision sensor not to need every year to do staking-out work.Use the worm drive device in the time of manually, mechanical structure is simplified, alleviated weight, reduced cost of production.

Below in conjunction with drawings and Examples the present invention further is illustrated.

Accompanying drawing 1 is a section plan of the present invention.

Accompanying drawing 2 is signal long distance transmission circuit schematic diagrams of embodiment.

Accompanying drawing 3 is computer control principle figure of embodiment.

1. motors, 2. sliding key sleeves, 3. casings, 4. hollow shafts, 5. worm gears, 6. key 7.O RunddichtringOs, 8. collars, 9. lids, 10. handwheel 11.O RunddichtringOs, 12. clutches, 13. push rods, 14. reflecting light lotus roots, 15. nuts, 16. bearings, 17. collars, 17. sleeves, 19. circuit boards, 20. worm screws, 21. lids, 22. bearings, 23. clutches, 24. springs in the accompanying drawing 1

3. smooth lotus root 4. schmidt shaping circuits of 1. power supplys, 2. reflecting light lotus roots (also can use slot type light lotus root) in the accompanying drawing 2.

In accompanying drawing 1, sliding key sleeve 2 is housed on the motor shaft, half of clutch 23 is housed on the sliding key sleeve 2, seal at this half top, be pressed on the push rod 13, second half is contained on the worm screw 20, and motor drives worm screw 20 by clutch 23 during work, worm screw 20 drives worm gear 5, drives hollow shaft 4 output torques by key 6.The axle of handwheel 10 withstands on the other end of push rod 13, and clutch 12 half is housed, and second half is contained on the worm screw 20, and spring 24 1 ends when free state on the motor shaft are pressed on the sliding key sleeve 2, and the other end is pressed on the clutch 23, makes clutch 23 closures.When the needs manually-operable, handwheel 10 is pushed, make clutch 12 closures, by push rod 13 clutch 23 is thrown off simultaneously.Is to have several roads groove at the clutch 12 of handwheel one side in half of worm shaft, the part surface of unslotted is electroplated, this plate surface and reflecting light lotus root 14 constitute a counting device, when worm screw is rotated time lotus root output pulse train, pass to computer by signal circuit, computer calculates valve opening and output torque.The bearing 16 of worm screw handwheel side is fixed in the sleeve 18, and sleeve 18 outer ends are fixed on the casing 3 with spring collar.Using sleeve (18) here is for easy for installation, if without sleeve also can be with collar directly with bearing fixing on casing.

In accompanying drawing 2, signal circuit adopts the electric current loop mode.R1, R2 are the current-limiting resistance of two 1K, and operating voltage is 24V, and every current in wire is no more than 20MA during proper functioning, and electric current is no more than 24MA during short circuit ground connection, are specially adapted to explosion-proof occasion.Signal OUT among the figure after the shaping sends into single-chip microcomputer and handles.

Accompanying drawing 3 is computer control principle figure, and it can match with the embodiment of accompanying drawing 1.Stroke prewired circuit shown in the figure, address prewired circuit and moment prewired circuit usefulness toggle switch and triple gate are formed, and the computer expert crosses triple gate and will preset several computer internal RAM of reading in when resetting.Can be by the aperture, control moment and the valve that change the toggle switch state and the change valve again at any time address of networking.

Claims

1, a kind of electric device for valve of computer control, particularly a kind of electric device for valve of measuring output torque by sensor indirectly, this device motor drives the worm drive worm gear by clutch, by the hollow shaft output torque that is contained on the worm gear, handwheel also can drive worm screw by another clutch, sleeve is fixed on the casing with collar, sensor also is housed on sleeve, the sensing body is housed on the worm screw to match with sensor, sensor goes out the worm screw rotary state, send into computer, computer is according to the valve opening of prewired circuit input, control moment and networking address, the aperture and the moment values that calculate valve are carried out various operations according to other external signals to valve again, it is characterized in that measuring indirectly by sensor the moment of valve Denso, a push rod is installed in hollow worm screw, make two clutch linkages by push rod, one another is thrown off when closed, adds a current-limiting resistance on the power line of sensor.

2, electric device for valve according to claim 1, it is characterized in that: use a sensor to go out the rotary state of worm screw, the computer expert crosses the measuring transducer number of pulse signals and calculates the aperture and the motor output torque of valve blanking time, according to the opening value that presets in the prewired circuit, control moment and external control signal valve is carried out various operations then, sensor can use photoelectric coupling circuit, electric convolution near switch or Hall switch.

3, electric device for valve according to claim 1, it is characterized in that: the two-way power supply of the photoelectric coupling circuit on the electric device for valve (reflective or slot type) is supplied with by control isolation end insulating power supply, service voltage is no more than 24V, add a current-limiting resistance on the power line of every road, make its operating current be no more than 20MA, short circuit current is no more than 24MA.