CN201258999Y

CN201258999Y - Adjustment straight-stroke valve actuator

Info

Publication number: CN201258999Y
Application number: CNU2008200422287U
Authority: CN
Inventors: 糜建立; 邵杰; 葛润平
Original assignee: POWER STATION AUXILIARY MACHINERY GENERAL PLANT CO Ltd CHANGZHOU
Current assignee: POWER STATION AUXILIARY MACHINERY GENERAL PLANT CO Ltd CHANGZHOU
Priority date: 2008-08-01
Filing date: 2008-08-01
Publication date: 2009-06-17
Anticipated expiration: 2018-08-01

Abstract

The utility model relates to an adjusting type linear motion valve drive device which comprises a frame, a gear reducing motor, a manual operation mechanism, and a screw nut linear motion mechanism connected with the valve; the gear reducing motor and the screw nut linear motion mechanism are interlocked by a pair of engaged gear shaft and gear; the gear shaft is connected with the gear reducing motor; the nut is fixed in the central shaft hole of the gear; the device is also provided with a moment control mechanism, a moment control mechanism, a motion control mechanism and the manual operation mechanism, has the function of over-moment protection during electromotion, and the limitation protection function of the linear motion valve, realizes the double security of an electric valve, protects the valve, has a long service life, and a simple structure, and is convenient and reliable to be operated.

Description

Adjustment type linear motion valve door drive

Technical field

The utility model relates to a kind of adjustment type linear motion valve door drive.

Background technique

Stop valve, gate valve one class are widely used in the major workss such as electric power, metallurgy, water conservancy, sewage treatment by the straight journey modulating valve that drive unit opens and closes; drive unit should have when crossing moment protective function, valve stroke position limitation protection function, power down mode when electronic the manually function of operated valve; with guarantee the straight journey modulating valve open and close and the aperture adjustment process is stable, reliable, long service life, and under cases of emergency such as electricity, do not influence the proper functioning of valve.Traditional straight journey adjustment type valve actuator structure is complicated, and easily produce misoperation and lose protective function, the torque controller instability, when valve stroke arrived stop, the impulse force that exists inertia to cause caused the damage of valve easily; In addition, the hand-operating device complex structure, easy to failure and can't operated valve during electronic and manual switchover.

Summary of the invention

The purpose of this utility model provides a kind of simple in structure, and operation is reliable, has the moment protective function, the spacing linear motion valve of adjustment type accurately door drive.

Feed screw nut's straight journey mechanism that this linear motion valve door drive comprises support, gear reduction motor, manual-operating mechanism and links to each other with valve, it is characterized in that tooth axle and the gear by pair of meshing links between gear reduction motor and the feed screw nut's straight journey mechanism, the tooth axle links to each other with the gear reduction motor, and nut is fixed in the central shaft hole of gear.

Said Torque Control mechanism contain fixed axle sleeve, the push rod that can in axle sleeve, stretch, push rod epimere be provided with the pass to cam, open to cam and upper and lower two stop nuts, the pass to cam, open to cam and be furnished with sensitive switch respectively, upper and lower two stop nuts are respectively as the sensitive switch contact of this two cam, the push rod hypomere stretches out axle sleeve and is socketed with Returnning spring, and the push rod lower end contacts with gear.

Said manually-operable structure is made up of the handwheel of connecting rod, the manual small gear that is fixed in connecting rod the inner, outer end and the fluted disc that is located at tooth axle upper end, small gear can be by the axial displacement and the fluted disc engagement of connecting rod, connecting rod is provided with the axial displacement positioning means of being made up of locating slot, little spring and steel ball, little spring one end is fixed, and an end is connected with steel ball.When pitman shaft outwards moves, realize the location when steel ball embeds locating slot, connecting rod is axially locked, and this moment, the fluted disc of manual small gear and tooth axle upper end just in time meshed; Rotate handwheel, can replace motor that the tooth axle is rotated, replace electric operating when being used to have a power failure.

This valve actuator further improves:

Be provided with range controlling mechanism, it comprises electrical control module, connecting plate, potentiometer, screw mandrel, and one of connecting plate is connected with screw mandrel, and the other end contacts with the potentiometer contact, and the signal output part of potentiometer is connected with the control signal input end of electrical control module;

Be provided with damping mechanism, it is the elastic element that is installed between the upper and lower bearing of central gear axis;

Said elastic element is a belleville spring.

In sum, the utility model is provided with Torque Control mechanism in base inner, it is had cross the moment protective function when electronic, and utilize switching value to control the unlatching of motor with closed, can be provided with stroke controlling structure, has position limitation protection function to straight stroke valve, and the unlatching that valve stroke is converted into electrical signal control motor is with closed, after adopting above-mentioned two structures simultaneously, the valve that motoring condition is worked has down been realized two-way safeguarding function, and manual operation function, now only need pass through handwheel, draw connecting rod just can realize outward, simple in structure, easy to operate, reliable; And the damping mechanism that is provided with is converted into the deformation quantity of spring with the deboost of answering valve rod, protects valve not to be damaged to greatest extent.

Description of drawings

Fig. 1 is a structure sectional view of the present utility model;

Fig. 2 is the part-structure schematic representation of stroke controlling structure.

Among the figure: 1 is support, and 2 are the gear reduction motor, and 3 is the tooth axle, 3-1 is a fluted disc, and 4 is gear, and 5 is nut, 6 is screw mandrel, and 7 is valve, and 8 is push rod, 9 is Returnning spring, and 10 for closing to cam, and 11 for opening to cam, 12,12-1 is a locking nut, and 13 is axle sleeve, and 14 for closing to sensitive switch, 15 for opening to sensitive switch, and 16 are the electrical control module, and 17 is connecting plate, 18 is potentiometer, and 19 is support, and 20 is connecting rod, 21 is small gear, and 22 is handwheel, and 23 is little spring, 24 is steel ball, and 25 is locating slot, 26,26-1 is upper and lower bearing, 27 is belleville spring, and 28 is the shaft shoulder.

Embodiment:

With reference to the accompanying drawings the utility model is specifically described:

As shown in Figure 1, gear 4 and tooth axle 3 formed the straight journey driving mechanisms, and screw mandrel 6 links to each other with straight stroke valve 7, and nut 5 and screw mandrel 6 are to be threaded and to be fixed in the central shaft hole of gear 4.By the tooth axle and the gear interlock of pair of meshing, the tooth axle links to each other with the gear reduction motor between gear reduction motor and the feed screw nut's straight journey structure, and nut is fixed in the central shaft hole of gear.

Torque Control mechanism comprises push rod 8, Returnning spring 9, closes to cam 10, opens to cam 11, push rod 8 can with the affixed axle sleeve 13 of support in move up and down, Returnning spring 9 is placed in push rod 8 lower ends and contacts with gear 4; The pass to cam 10, open to cam 11 and be separately fixed at the epimere of push rod 8 by two locking nuts 12,12-1, close to cam 10, open to cam 11 be furnished with respectively the pass to sensitive switch 14, open to sensitive switch 15.

The fluted disc 3-1 that manual-operating mechanism comprises connecting rod 20, be fixed in the manual small gear 21 at connecting rod 20 two ends, handwheel 22 and be located at tooth axle 3 upper ends forms; But connecting rod 20 axial stretchings, axially locating mechanism comprises little spring 23, steel ball 24, connecting rod are provided with locating slot 25.When connecting rod 20 is pulled outwardly moving displacement by handwheel 22, the elastic force of little spring 23 embeds in the locating slot 25 steel ball 24 and plays positioning action, and the contrate gear 3-1 at this moment manual small gear 21 and the tooth axle 3 just in time meshes, and rotates handwheel 22, can replace motor that tooth axle 3 is rotated, standby for having a power failure.

The belleville spring 27 that is clipped between upper and lower bearing 26, the 26-1 constitutes damping mechanisms, and bearing 25, bearing 26, belleville spring 27 are installed in the buffer area between gear 4 and the support 1 successively.

As shown in Figure 2: range controlling mechanism comprises electrical control module 16, connecting plate 17, potentiometer 18, screw mandrel 6; Connecting plate 17 1 sides are connected with screw mandrel 6, and opposite side contacts with potentiometer 18 contacts; Potentiometer 18 is fixed on the support 19, and support 19 is fixed on the support 1; The signal output part of potentiometer 18 is connected with the control signal input end of electrical control module 16.

The utlity model has the moment protective function: during proper functioning, driven by gear reduction motor 2, drive tooth axle 3, gear 4, nut 5, screw mandrel 6 rotate successively, and screw mandrel 6 drives valves and moves axially; When valve was closed fully, screw mandrel 6 moved down and is obstructed, and nut 5 is moved up by reaction force vertically, driven gear 4 moves up, gear 4 promotes push rod 8 and moves up, and sends signal when the pass of push rod 8 when cam 10 touches the pass to sensitive switch 14, cuts off the power supply of gear reduction motor 2.In the process that nut 5 moves up, the shaft shoulder 28 of its lower end drives bearing 26 and moves up, and belleville spring 27 is compressed, and decrement equals the amount of movement of push rod 8; Otherwise; in the valve opening, under the elastic force effect of push rod 8, move down, when opening on the push rod 8 sent control signal when cam 11 shake-up are opened to sensitive switch 15 at Returnning spring 9; cut off the power supply of gear reduction motor 2, split the valve process and carried out force moment protection.

Have the spacing function of posting a letter of valve stroke: in valve 7 runnings, the drive connecting plate 17 that moves up and down of screw mandrel 6 moves up and down, and potentiometer 18 produces the 4～20mA current signal corresponding with valve position; Under auto state, the standard analog signal (4～20mA, DC) that electrical control module 16 receives from control system, and with its with compare from the current signal on the potentiometer 18, if the dead band that both differences are set greater than customer requirements, then electrical control module 16 is sent control signal, drives adjustment type straight journey actuator to the direction operation that reduces both deviations, is zero until both deviations, control signal takes place in electrical control module 16, makes gear reduction motor 2 out of service.

Has when power failure manual operation function: during manually-operable, pull out handwheel 22 (about 8mm), rotate handwheel 22, by the face gear engagement on manual small gear 21 and the tooth axle 3, turning gear axle 3, following transmission line is with electronic consistent, after operated by handwheel finishes, advance handwheel, under little spring 23 elastic force effects, steel ball 24 location return to the preceding position of operated by handwheel.

Claims

1. the drive unit of adjustment type straight stroke valve, comprise support (1), gear reduction motor (2), manual-operating mechanism and the feed screw nut's straight journey mechanism that links to each other with valve (7), in this straight journey mechanism, screw mandrel (6) and nut (5) are to be threaded, it is characterized in that tooth axle and the gear by pair of meshing links between gear reduction motor (2) and screw mandrel (6) nut (5) the straight journey mechanism, tooth axle (3) links to each other with gear reduction motor (2), and nut (5) is fixed in the central shaft hole of gear (3).

2. the drive unit of adjustment type straight stroke valve according to claim 1, it is characterized in that being provided with Torque Control mechanism, contain the push rod (8) that can in fixed axle sleeve (13), move up and down, Returnning spring (9), close, open to cam (11) to cam (10), push rod (8) lower end is with Returnning spring (9), and contact with gear (4), close to cam (10), open the epimere that is separately fixed at push rod (8) to cam (11) by two locking nuts (12), (12-1); The pass to cam (10), open to cam (11) be furnished with respectively the pass to sensitive switch (14), open to sensitive switch (15).

3. the drive unit of adjustment type straight stroke valve according to claim 2, it is characterized in that said manual-operating mechanism by connecting rod (20), be fixed in the handwheel (22) of the inner manual small gear (21) of connecting rod (20), outer end and the fluted disc (3-1) that is located on the tooth axle (3) is formed, small gear (21) can pass through the axial displacement and fluted disc (3-1) engagement of connecting rod (20), connecting rod (20) is provided with the axial displacement positioning means of being made up of locating slot (25), little spring (23) and steel ball (24), little spring (23) one ends are fixed, and an other end is connected with steel ball (24).

4. the drive unit of adjustment type straight stroke valve according to claim 3, it is characterized in that being provided with stroke controlling structure, comprise electrical control module (16), connecting plate (17) and potentiometer (18), said connecting plate (17) one ends are connected in screw mandrel (6), the other end contacts with the contact of potentiometer (18), and the signal output part of potentiometer (18) is connected with the control signal input end of electrical control module (16).

5. according to claim 1 or 2 or the drive unit of 3 or 4 described adjustment type straight stroke valves, it is characterized in that being provided with damping mechanism, it is the upper and lower bearing (26) that is installed in central gear axis, the elastic element between (26-1).

6. the drive unit of adjustment type straight stroke valve according to claim 5 is characterized in that said elastic element is belleville spring (27).