CN2109481U

CN2109481U - Electric device for valve

Info

Publication number: CN2109481U
Application number: CN 91204829
Authority: CN
Inventors: 王庆宪; 常月芝; 张希诚; 王庆良
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-02
Filing date: 1991-04-02
Publication date: 1992-07-08

Abstract

An electric valve device comprises a worm gear, which is equipped in a case, clutches, a counting device, a torque measuring device and a computer, etc. An operating stress perch style is used for measuring torque of the device. Coordinating with a computer, various operating states of the valve can be controlled. The hand operation of the valve is carried out through the endless screw. The mechanical structure of the valve can be reduced.

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, contactless stroke measurment mechanism and contactless torgue measurement mechanism a kind of is that structure is the simplest, and be easy to use, the Electric actuator that is easy to control.But this Electric actuator also has some following deficiencies:

The torgue measurement mechanism of this Electric actuator is by the butterfly spring assembly, and counting chi and non-contact detector are formed.The measurement of its moment is to drive the motion of counting chi by moving axially of worm screw, detects from detector.The electric device for valve fitness for purpose will have man-operated mechanism so that still can operate valve when having a power failure.Requirement simultaneously must have electronic-manual switching device.Because this Electric actuator adopts the form of the worm screw that floats, its manual operating device and electronic-manual switching device have to be contained on the output shaft.This just makes that its structure is bigger, and particularly under big moment situation, not acceleration and deceleration device just can't be with manually reaching rated moment, makes more bad processing on the structure.In addition, because worm screw floats, when forward and reverse conversion, the worm screw idle stroke of must passing by just can drive worm gear then, and this uses in requiring sensitive modulating valve and is subjected to certain restriction.Have, gauge is adopted in its torgue measurement again, can not continuous measurement, thus can not satisfy some other special requirement.Also have, owing to manually import from output shaft, when using manually-operable, detector can't provide the clockwise and anticlockwise signal, therefore can not correspondingly count, and must manually adjust when service restoration.

Task of the present invention provides a kind of employing stress bar measuring mechanism, the electric device for valve by worm drive in the time of manually.

Task of the present invention is to finish with following mode.In the outside of worm screw bearings at both ends, link to each other with motor or handwheel by clutch, finish electronic or manually-operable.In a stress sleeve, the outer end of sleeve is fixed on the shell in the bearing fixing of the worm screw of a manual side, and bearing one end and casing are slidingly connected, and post foil gauge on the outer wall at sleeve middle part, form bridge-type and detect the loop.In stress sleeve the inside clutch is housed, handwheel can be connected or throw off by clutch with worm screw.Motor one side worm screw also has a clutch, and a handle is arranged on shell, has bar to insert in the shell on the handle, the clutch of stirring Clutch Control motor shaft and worm shaft by a shift fork.Worm gear is fixed on the hollow shaft, and a counting scale is housed on hollow shaft, by a detector output shaft rotation angle signal is spread out of.By these signals, computer can be realized switch control, functions such as Torque Control.Particularly, computer can also be remembered in the manual intervention when having a power failure, and needn't readjust when restoring electricity.

Further be illustrated below in conjunction with accompanying drawing: accompanying drawing 1 is the plan view of Electric actuator of the present invention, (1) be motor, (2) are clutches, and (3) are shift forks, (4) be worm gear, (5) be key, (6) hollow shaft, (7) are bearings, (8) be worm screw, (9) be clutch and handwheel, (10) are the stress sleeves, and (11) are foil gauges.The clutch of motor and worm screw drives clutch (2) by shift fork (3) and realizes.Clutch manual and worm screw is to realize with the clutch on the worm screw by the clutch (9) that is contained on the handwheel.During proper functioning, under the effect of spring, throw off automatically, can manual drives when pushing.Can realize interlock as between handwheel and shift fork (3), adding a connecting rod.

Accompanying drawing 2 has shown the mounting structure of worm screw and counting scale, and (12) are counting scales, and (13) are detectors, and (14) are bearings, and (15) are worm gears, and (16) are shells, and (17) are the moment output shafts.

Accompanying drawing 3 has shown the structure of electric motor clutch driving lever, and (18) are driving levers, and (19) are handle and locating stud.Handle has two positions, one be with motor be to close from one with motor.

Claims

1, a kind of electric valve device, by be contained in the worm gear pair in the casing, two clutches, counter, stress sleeve, handwheel and motor are formed.It is characterized in that: 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, bearing is equipped with at the worm screw two ends, the bearing and the casing of motor one end are slidingly matched, the other end is fixed in the stress sleeve, and an end of stress sleeve and the casing the other end that is slidingly matched is fixed on the casing, and the counter of being made up of a counting scale and detector is housed on hollow shaft.

2, according to right 1 described electric valve device, it is characterized in that: clutch is equipped with at the two ends worm screw, and two clutches also can add a connecting rod makes its interlock, and a clutch is only arranged at any one time is closed.

3, electric valve device according to claim 1 is characterized in that: the outer end of stress sleeve is fixed on the casing, and inner and casing is slidingly connected, and sleeve outer wall posts foil gauge.