SUBSTANCE: electromechanical drive includes electric motor, stator, rollers and output stock. Stator encloses hollow rotor. Rollers are equipped with external thread and arranged in cavity of rotor in threaded sleeve in circumferential direction. Axes of rollers are parallel to rotor axis. Screw is coaxially arranged inside rotor. Screw has external thread. Thread of screw interacts with thread of rollers. Thread of rollers interacts with internal thread of sleeve. Sleeve is rigidly attached to one end of output stock. The latter is installed so that it is protected against being turned. One screw end is rigidly attached to rotor. The other end of screw is arranged in cavity of output stock.
EFFECT: higher reliability of electromechanical drive.
9 cl, 3 dwg
The present invention relates to an electro-mechanical linear actuators, in particular to the Electromechanical actuator, and can be used to move the shut-off valve in the control system of the turbine, which is important for the safety of nuclear power plants.
One means of ensuring the safety of nuclear power plants is the actuator shut-off valve of the turbine, allowing for a few tens of milliseconds to move the shutoff valve for a few tens of millimeters and thereby quickly change the flow rate of the working environment. In this actuator must be provided with high reliability, accuracy and speed of testing the position of the actuator drive, interacting with shut-off valve. The actuator must have a compact design.
Know the use of Electromechanical actuators for converting rotational motion into linear motion and control of machines and mechanisms connected with them. In particular, from EN 2213896 (13.04.1999) known Electromechanical actuator for valves, containing an electric motor with a hollow rotor, which houses a threaded sleeve and a screw spindle connected to the locking body. The drive is enclosed in a stationary housing. In the hollow rotor nm is the engine between the stem nut and screw posted by spindle nut, made in the form of three cylindrical threaded rollers located in the separators. Threaded sleeve and the glass is stationary in the hollow rotor, have the spline grooves, which enable their linear movement relative to each other.
Known drive is small and sufficient reliability for standard pipe fittings provided by the fact that the threaded sleeve, threaded rollers, covered it, and the screw spindle, a floating rotated around the rollers, form a roller-screw transmission, in which the load is transmitted through the threaded surface of all rollers, which ensures maximum contact area.
The main disadvantage of this drive is relatively large moment of inertia of the rotating parts of the drive. From physics it is known that the moment of inertia of the mechanical system about a fixed axis is equal to the sum of the products of the masses of all material points system on the squares of their distances to the axis. In a known drive a relatively large moment of inertia of the rotating parts due to the direct connection of the rotor with a threaded sleeve, resulting in the need for the use of glass connecting the rotor with the stem nut, and the choice of the wall thickness of the rotor and a threaded sleeve with regard to their soy is inane with a glass (for example, slotted and/or keyed), excess thickness due to their functional purpose (for example strength, magnetic saturation and so on). In other words, the direct kinematic connection of the rotor with a threaded sleeve leads to the necessity of introduction of constructive communication, implemented through additional mass enclosed between the rotor and the screw sleeve.
Thus, a large moment of inertia of the rotating parts in the known drive does not allow to provide the desired rate of mining the position of the actuator of the Electromechanical drive without high energy costs.
Furthermore, the design of known actuator does not meet the redundancy requirements of the control system of the turbine nuclear power plant to provide the required reliability and safety.
Also known in the drive there is no possibility to determine the location of its Executive body (screw spindle).
The task of the invention is to eliminate these disadvantages, in particular the provision required for the safety of nuclear power plant speed and accuracy of testing the position of the actuator drive with minimal loss of energy in the control system of the turbine unit.
This problem is solved by using linear electro is mehanicheskogo drive, containing an electric motor, the stator of which comprises a hollow rotor. In addition, the proposed actuator includes an output shaft and rollers, equipped with an external thread and placed in the cavity of the rotor into the threaded sleeve circumference so that their axes parallel to the axis of the rotor. From the known drive the proposed actuator differs in that the inside of the rotor are placed coaxially screw having external threads cooperating with the threads of the rollers, which also communicates with the internal thread of the specified sleeve rigidly connected with one end of the output rod set with a hold, turn, and with one end of the screw is rigidly connected to the rotor and the other end of the screw is placed in the cavity of the output shaft.
In the proposed drive screw, interacting through the thread rollers with a non-rotating threaded sleeve has a relatively small diameter, and the rotor is constructed as light as possible, so the rotating part of the actuator has a relatively small moment of inertia, which allows to provide the desired rate of mining the position of the actuator of the Electromechanical drive without high energy costs.
Hold the output shaft from rotation preferably is provided protivootecona device containing arm rigidly mounted on the output shaft, and wheel, two withwhich mounted on spring-loaded levers, emerging from the beam, essentially perpendicular to the longitudinal axis of the output shaft.
The rotor of the proposed Electromechanical actuator is preferably mounted in a bearing unit with prenotazione to eliminate axial play.
The interaction of the external thread of the screw with internal thread of the sleeve, through the external threads of the rollers, preferably is gapless.
In a preferred embodiment of the invention, the rollers of nine pieces placed in cages installed in the threaded sleeve and the output shaft has a smooth surface.
To repay the kinetic energy of the moving parts of the proposed Electromechanical drive for achievement of output shaft end positions of its stroke preferably limited elastic elements, such as Belleville springs or rubber buffers.
The rotor of the electric motor in the Electromechanical actuator can rotate both clockwise and against it, causing displacement of the output shaft in one direction, for example, to close the shutoff valve and in the opposite direction, respectively, to open the valve.
To ensure the reliability of the Electromechanical actuator on the rotor of the electric motor coaxially one behind the other fixed at less than the least two sets of pole magnets, covered respectively by at least two sets of pole coils of the stator, placed coaxially one behind the other. Thus, in the proposed Electromechanical actuator redundant duplication of the power of the electrical part. In addition, for the purpose of backing duplication double the electrical connectors, coil brake control, and sensor feedback.
Sensor feedback allows the required accuracy to determine the current position of the output shaft with the filing of the corresponding signal. When receiving a drive signal for changing the operating position of the shut-off valve in the engine fires one pair of stator-rotor failure which may be included in the work of another pair of the stator-rotor.
In addition, the proposed Electromechanical actuator absence of mechanical backlash, high accuracy output shaft interacting with shut-off valve, and protection of the output shaft from contamination.
The proposed Electromechanical actuator has high performance and allows for minimal energy consumption with high reliability and speed to control the position of the shutoff valve of the turbine nuclear power plant.
1 schematically shows a section of the proposed electromechani the definition of the drive.
Figure 2 schematically shows a section of the proposed Electromechanical actuator, made according to line a-a in figure 1.
Figure 3 schematically shows the construction of the spring-loaded rocker levers offer Electromechanical actuator. Depicted by the form B in figure 2.
As shown in figure 1, the Electromechanical actuator includes a motor 1, the stator 2 which covers the hollow rotor 3 and nine rollers 4, provided with an external thread and placed in the cavity of the rotor 3 in the separators 5 circumference, so that their axes parallel to the axis of the rotor 3.
The rotor 3 is rigidly connected with the screw 6, coaxially fixed within it and having external threads cooperating with the threads of the rollers 4. Thread rollers 4 also communicates with the internal thread of the sleeve 7, is placed in the cavity of the rotor 3, covering the rollers 4 and is rigidly associated with the Cup 8. The Cup 8 is placed on the end of the output rod 9, which is made preferably in one piece. Thus, the sleeve 7 is rigidly connected with the inner end of the output shaft. The outer threaded end 10 of the output 5 of the rod 9, which is the Executive body of the Electromechanical drive is connected to the locking body, in this example, with shut-off valve.
Rigid connection of the screw 6 with the rotor 3 is implemented rigid fastening one end of the screw 6 in the hub 11 of the rotor 3, which size is placed at one end of the rotor 3 and in turn, planted in paired angular contact thrust bearings bearing unit 12, providing play-free rotation of the rotor 3. The other end of the rotor 3 is planted on radial thrust bearings bearing Assembly 23. On the rotor 3 fixed two sets of pole magnets 13, placed coaxially one behind the other and covered respectively by the sets of pole coils of the stator, placed coaxially one behind the other.
Output shaft 9 is held against rotation around its longitudinal axis protivootecona device containing the rocker arm 14, which is mounted on the output shaft 9 is essentially perpendicular to it, and fixed. At the two ends of the rocker arm 14 mounted on a pair of wheels 15 (2), the axis of which is essentially perpendicular to the longitudinal axis of the output shaft 9. The axis of one wheel 15 one specified pair and the axis of one wheel 15 other specified pair, located at the opposite end of the rocker arm 14 is diametrically opposed relative to the longitudinal axis of the Rod 9, is stationary. The other two opposite wheel 15 is spring-loaded, because they are installed on the spring levers 16 (3)made with the possibility of angular displacement around its axis 17, and the axis of rotation of the spring-loaded wheel and the axis of rotation of the lever spaced a few millimeters. Eliminating coal is the first play of the rocker arm 14 is due to sample clearance between the wheels 15 and the inner surface of the longitudinal grooves of the cylinder 18 (Fig 1).
Electromechanical actuator also includes a braking device 19 having two control coils 20 and two sensors 21 feedback, mounted on the cylindrical part of the screw 6, closed on the outside by a cap 22. The housing of the Electromechanical actuator Assembly formed by the cap 22, the brake unit 19, the bearing unit 12, the engine 1, the bearing unit 23, the cylinder 18 has a mounting flange 24, which are drawn together by pins 25. The limitation of the stroke of the output rod 9 when it reaches the end position is the Belleville springs 26.
When the drive rotation of the hollow rotor 3 of the motor 1 causes the rotation of the screw 6, external thread which cooperates with a thread covering its rollers 4 and causes them to rotate around their axes. Thread rollers 4 also interacts with the internal thread of the sleeve 7. The rotation of the roller 4 causes linear movement of the sleeve 7, is rigidly connected with the output shaft 9 through the glass 8 and causing the shut-off body in translational motion. Depending on the direction of rotation of the rotor is closing or opening of the shut-off valve (not shown).
Since the diameter of the screw 6 is relatively small, and the rotor 3 is made as light as possible, the rotating part of the actuator has a small moment of inertia and provides the desired rate of mining provisions of the grant is part of the body of the Electromechanical drive without high energy costs.
1. Electromechanical actuator containing an electric motor, the stator of which comprises a hollow rotor, rollers, equipped with an external thread and placed in the cavity of the rotor into the threaded sleeve circumference so that their axes parallel to the axis of the rotor and output shaft, characterized in that the inside of the rotor are placed coaxially screw having external threads cooperating with the threads of the rollers, which also communicates with the internal thread of the specified sleeve rigidly connected with one end of the output rod set with a hold, turn, and with one end of the screw is rigidly connected to the rotor and the other end of the screw is placed in the cavity of the output shaft.
2. Electromechanical actuator according to claim 1, in which the output shaft is held from rotation around its longitudinal axis protivootecona device.
3. Electromechanical actuator according to claim 1, in which the rotor is mounted in a bearing unit with prenotazione to eliminate axial play.
4. Electromechanical actuator according to claim 1, in which the interaction of the external thread of the screw with internal thread of the sleeve, through the external threads of the rollers is gapless.
5. Electromechanical actuator according to claim 1, in which the rollers nine.
6. Electromechanical actuator according to claim 1, in which the rollers are placed in cages installed in threaded liners is E.
7. Electromechanical actuator according to claim 1, in which the output rod has a smooth surface.
8. Electromechanical actuator according to claim 1, in which the stroke of the output rod is limited by elastic elements, such as Belleville springs or rubber buffers.
9. Electromechanical actuator according to claim 1, in which the rotor coaxially to each other is fixed, at least two sets of pole magnets are covered, respectively, at least two sets of pole coils of the stator, placed coaxially one behind the other.
FIELD: machine building.
SUBSTANCE: invention is designed for application of device preventing rotation of servo-motor mounted on driven shaft of rotary shut-off gate of gas-transporting pipe. In particular, this gate can be positioned in a structure of a heating pipe, ventilation, air conditioning or smoke pipe. Device preventing rotation of servo-motor (10) is set with geometric lock and/or power lock on projecting driven shaft (22) of rotary shut-off gate (62) of gas-transporting pipe (34). At least one shifting lengthwise bracket (36) maintaining servo-motor (10) is positioned at adjusted axial distance (a) from driven shaft (22).
EFFECT: simplified assembly and operation of device.
10 cl, 10 dwg
SUBSTANCE: valving drive comprises reversible motor and extending spindle. The latter is coupled with valve gate. Reduction gear is arranged between motor and extending spindle. Reduction gear consists of housing, drive cam shaft, bevel pinion, cone coupling, sliding nut and hollow output shaft. The latter is arranged aligned with extending spindle. Helical pinion is a two-rim pinion. Said helical pinion is jointed with housing and engaged with two-rim pinion rim. Cone coupling is jointed with hollow output shaft and engaged with two-rim pinion rim. Sliding nut is fitted at hollow shaft lower part.
EFFECT: motor reduced rpm for lifting valve gate at drive lower weight and smaller sizes.
FIELD: machine building.
SUBSTANCE: drive of valve consists of case, valve rod, spring and of driving devices. The rod is connected to a gate element. The gate element travels between the first and the second positions. The spring shifts the gate element from the said first position into the said second position. The first driving devices are designed for tension of the spring and for retaining the spring in a compressed state. The second driving devices are designed for transfer of the gate element from the first position into the second position. The second driving devices include a transmission with a roller screw. Also the second driving devices operate independently from the first driving devices. Releasing devices free the spring to return the gate element into the second position. There is disclosed the version of design of the valve device for this drive.
EFFECT: increased speed of response for valve opening in emergency cases.
7 cl, 10 dwg
FIELD: mechanical engineering.
SUBSTANCE: invention relates to field of pipeline valves, particularly to structures of quick-acting motor valves with axisymmetric seats and rotary plugs, and is provided for close control of flows of arbitrary flowing fluids on the basis of liquids and gases, locking and unlocking of vacuum pipelines. Motor valve with rotary plug contains casing 1 with inlet 2 and outlet 3 branches, axisymmetric seat 4, rotary plug 5, rotary drive on the basis of piezoelectric motor 7. Seat 4 is rigidly fixed inside the casing 1. Rotary plug 5 is put into seat 4 and allows guide bar 6. Motor 7 allows annular piezoelectric oscillator 8 radially directed vertical acoustic waves. Oscillator 8 is rigidly fixed with casing 1 of valve and outfitted by facilities for connection to pulsed current source and control system. Flexible annulus 9 is acoustic hermetically joined to piezoelectric oscillator 8. Annulus 9 is outfitted by flexible clack tappet 10. Rotor 11 is located with steady clearance relative to piezoelectric oscillator. Rotor 11 is introduced into frictional contact with flexible clack tappet 10. Rotor 11 is interlocked with guide bar 6 of rotary plug 5.
EFFECT: rising of valve performance and rising of precision of angular positioning of plug relative to seat.
7 cl, 2 dwg
SUBSTANCE: proposed mechanism comprises housing, motor, spindle, motor base, cam-type torque conversion mechanism including cam and pushrod interacting with valve stem arranged to move axially, and electric switch. Note that the proposed mechanism additionally incorporates and outer cam wheel. Note also that the fixed cam comprises base plate attached to the motor base and accommodates, at least, one lifting/downing profile. The said pushrod is fitted at greater distance from the motor than aforesaid fixed cam and represents a rotary disk with appropriate actuating and guiding appliances. The said outer can wheel is coupled with the spindle to transmit torque to the pushrod and to interact with electric switch.
EFFECT: simple design, ease of manufacture.
8 cl, 6 dwg
FIELD: machine building.
SUBSTANCE: invention deals with methods of control over power-pressurised switch gear operating under time-varying thermal conditions within the framework of multi-phased technological processes and is aimed to provide for remote control of vacuum valves. The proposed remote control method envisages utilisation of multiple shutting-off device position stops and valve pressurisation effort amount restrictors. The position stops are remotely connected and the shutting-off device required position stops and pressurisation effort amount restrictors are operated.
EFFECT: enhanced valve pressurisation reliability, facilitated control over the shut off medium flow and reduced redundant deformation of the sealant element.
2 cl, 1 dwg
FIELD: the invention refers to armature construction namely to actuating mechanisms for pipeline armature.
SUBSTANCE: the actuating mechanism has a flange 1 with an opening for installation on the armature, a located under it a bridge 5 with a co-axial opening and an arrangement for fastening of the rod of the armature. The actuating mechanism has also a drive interacting with one of the two cog-wheels located diametrically to the opening of the flange 1 and placed in bearings. The cog-wheels are connected with the bridge 5 through screw mechanisms for its reciprocal movement relatively to the flange. The connection between the cog-wheels is fulfilled through a hollow cog-wheel covering the opening of the flange 1 and having ledges. The hollow cog-wheel contacts with the rollers installed at its both sides.
EFFECT: high meanings of mechanical transmission are achieved.
4 cl, 5 dwg
FIELD: closing and opening large valves.
SUBSTANCE: proposed drive is provided with engine which acts on threaded rod by means of transfer mechanism. Nut of transfer mechanism is screwed on threaded rod. Transfer mechanism is provided with clutch consisting of two members which are thrown into engagement by means of toothed rim of one member and toothed rim of other member. One member is movable in axial direction during rotation of said member relative to each other. Shifting member is connected with switch.
EFFECT: automatic adjustment of valve to different valves.
14 cl, 5 dwg
FIELD: machine building.
SUBSTANCE: elasto-dampening clutch consists of driving shaft, driven shaft and intermediate bush. The driving shaft is connected with an intermediate bush by means of screw splines. On external surface of the intermediate bush there are cut screw splines of counter direction engaged with internal screw splines of the driven shaft. An elastic element is installed between the intermediate bush and the flange of the driving shaft via an anti-friction washer. Also, tilt angle of a screw line of splines amounts to φfr≤ψ≤ (90°-φfr), where φfr - is friction angle.
EFFECT: increased angle of twist of driving shaft relative to driven one and increased power output of clutch.
FIELD: machine building.
SUBSTANCE: crank-gear consists of movable drive, of crank, of connecting rod, of outlet link with roller entering slot made on stationary link-pole. The connecting rod enters screw kinematic pair with an outlet link. The drive consists of engine and gear and is rigidly connected with a bush of the crank. Motion from the engine to the crank is transferred via the gear.
EFFECT: expanded functionality of gear due to free relative motion of links in gear.
FIELD: machine building.
SUBSTANCE: drive with screw pair consists of solid case wherein nut of lead screw is positioned on lead screw. The safety clutch is formed between the nut of the lead screw and internal side of the case. The safety clutch disengages under effect of disengaging force to the lead screw of the ball screw pair. Also, the drive consists of a device for pre-tension corresponding to an actuator link regulated to pre-tension force; the device actuates the safety clutch via a movable pressure element. Each pressure element slides along surface of the case and side surface of the lead screw nut.
EFFECT: simplified design of device ensuring pressure tightness of drive structure.
11 cl, 2 dwg
FIELD: machine building.
SUBSTANCE: linear actuator consists of case and of reducer motor for drive of spindle with thread. A nut transferring a pusher is installed on the spindle with thread. The spindle with thread is connected to a reducer motor by means of a chain gear. A shaft of the reducer motor and the spindle with thread are parallel and directed to opposite sides. Also, the reducer motor is eccentrically set to ensure tension of chain drive.
EFFECT: increased accuracy of positioning and repeatability of linear actuator.
9 cl, 3 dwg
SUBSTANCE: actuator includes reversible electric motor and transmission to bring the actuating element having the possibility of back-and-forth movement into action. Actuating element, motor and transmission has no self-locking. There is brake to retain the actuating element in any position when electric motor is not active. The above brake can also be released with circuit breaker mechanism. Motor is used as generator when the brake is released, and stress created with generator is used to control the speed of actuating element. There is quick-acting circuit breaker which allows disengaging the actuating element from motor and transmission for correction of position in such state; at that, movement of actuating element in disengaged state occurs at controlled speed.
EFFECT: simplifying and control of speed during disengagement.
14 cl, 9 dwg
FIELD: machine building.
SUBSTANCE: reducer of rotary motion consists of pole, of inlet and outlet links, and also of first and second intermediate links. The inlet and outlet links form rotary kinematic couples with the pole. The first intermediate link with the inlet link and the second intermediate link forms screw kinematic couples, while together with the pole it forms a progressive kinematic couple. The second intermediate link with the inlet link, the outlet ink and the first intermediate link forms screw kinematic couples.
EFFECT: increased reliability of mechanism.
FIELD: machine building.
SUBSTANCE: screw mechanism consists of cylinder case with upper and lower flange, of screw with nut and of gear electric drive with output shaft secured on lower flange. A retractable bar lengthwise axis of which coincides with lengthwise axis of the case is installed inside the cylinder case. The nut is motionless fixed on the lower flange of the retractable beam. With its one end the rotary screw is fixed on the upper internal flange of the case, with its another end the screw projects from the nut outside the external flange of the retractable bar and is connected with the main output shaft of the said electric drive. Side surfaces of the said flanges facing walls of correspondingly case and retractable bar are movable and conjugate with the walls. The mechanism also contains an additional pair of the screw and nut installed similarly to the main part with diametrically opposite side relative to walls of the case and retractable bar. One end of the additional screw is coupled with the additional output shaft of the said electric drive.
EFFECT: raised reliability and precision of mechanism operation, improved dimension and weight characteristics of mechanism.
4 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: facility consists of screw with stop, of nut, and of case with orifice and slots. The screw with a stop and the nut threaded on the screw are arranged in the case. Also one end of the screw enters the orifice in the case, while the nut rests on the case at least with a part of its side surface at any position relative to the screw. k1S1>k2S2, where k1- is friction ratio between touching surface of the nut and the case, k2 - is friction ratio between touching surfaces of the nut and the case, S1- is area of the nut and case touching surface, S2 - is area of the nut and screw touching surface.
EFFECT: increased reliability and service life of facility, and nut gradual braking when it rests against case.
4 cl, 3 dwg
FIELD: machine building.
SUBSTANCE: mechanism contains circular shaft, helic shaft, located inside circular shaft and multitude of planetary shafts. Circular shaft allows internal threaded section and the first and the second annular pinion gears, which are tooth gear internally toothed. Solar shaft includes internal treaded section and the first and the second sun pinions, herewith sun pinions are external gears. Planetary shafts are located around the sun shaft, herewith each of shafts includes external threaded section and the first and the second planet wheels which are external gears. External threaded section of each planetary shaft is geared with internal threaded section of annular shaft and with external threaded section of sun shaft. Each the first and the second planetary wheels are geared correspondingly with the first and the second ring gears and sun wheels. Additionally planetary shafts are implemented with ability of providing of relative rotation of between the first planetary gear and the second planetary gear.
EFFECT: reduction of mechanism wear and effectiveness increase and conversion of rotary motion into translational motion.
15 cl, 13 dwg
FIELD: machine building.
SUBSTANCE: device for transformation of motion consists of screw, casing with covers and thread rolls. Thread rolls with ends installed in casing with ability of rotation around its axis and allows cylindrical threaded surfaces engaged to screw. At ends of each thread roll there are implemented spherical projections centres of which are located on axis of roller. At each cover there are implemented spherical angular clearances centres of which are also located on axis of corresponding roller. Additionally radius of spherical angular clearances in covers for 2-3% more than radius of spherical projections implemented on corresponding to it ends of each threaded roll. Device is outfitted by two pins which are provided for angular attitude of covers relative to casing.
EFFECT: increasing of output capability and durability of device, decreasing of its overall dimensions.
3 cl, 5 dwg
FIELD: mechanical engineering; drives of machines, manipulators of industrial robots.
SUBSTANCE: proposed helical transmission has lead screw secured in bearings and nut. It is also provided with rod connected with nut and holders. Nut is made in form of stack of elastic threads located between holders.
EFFECT: enhanced reliability; avoidance of regulation; increased loading capacity.