Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
  • F15B9/14—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with rotary servomotors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
  • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
  • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
  • F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means

Definitions

• the invention is related to mechanical engineering particularly to the mechanisms intended for remote control of the gas and petroleum products pipelines stop and control devices actuators.
• a pneumohydraulic drive with the piston engine comprising pneumatic cylinders, pistons, rotation gear, limit switches (See e.g. Gurevich A. F. and others., “Gas and Oil Pipelines Devices Guidebook” Leningrad, “Nedra”, 1988. p. 346) is known.
• the engineering deficiencies of this drive include: presence of moving rubbing seals which reduce the drive reliability and service life, large volume of the pressurized air filled cavities, which results in impact actions on the controlled object, probability of the arbitrary movement of the drive output shaft under the external load.
• a pneumohydraulic drive with a piston engine comprising pneumohydraulic cylinder, pistons, crank rotation gear, limit switches (See e.g. Gurevich A. F. and others., “Gas and Oil Pipelines Devices Guidebook” Leningrad, “Nedra”, 1988. p. 348) is known.
• the engineering deficiencies of this drive include: presence of oil or special fluid as the second actuating medium, which makes the drive operation more complicated and expensive, presence of the rubbing moving seals, probability of the arbitrary movement under external loads.
• a jet engine pneumatic drive which contains electropneumatic control device, pneumatic jet engine, reducing gear, hand-operated doubler, crank screw rotation gear, maximum transmitted moment restrain arrangement.
• Crank screw rotation gear comprises the housing, locating flange, crank screw rotation gear consisting of the grooved crank rigidly fixed to the drive output shaft, a lengthwise movable lead screw mounted inside the housing, which is in series and coaxial to the drive movable parts kinetic energy absorbing unit made of a sequential set of disk springs mounted on the stick implemented together with the lead spring.
• a sliding nut is flexibly joined to the lead screw and is mounted into the guide while the guide is provided on its two sides with coaxial trunnions equipped with two sliders on each trunnion.
• the rotation gear housing is made of two parts including the housing proper (central body) and the cover where each part is furnished with a lead groove whereas the grooves are parallel and the outer guide sliders move into one and the other respective grooves and the middle sliders move into one and the other respective grooves of a crank. (See RU N2 2131065, 1999.)
• the engineering objective of the invention is to create a pneumohydraulic drive for gas and petroleum products pipelines stop and control devices which is to feature reduced dimensions, increased range of application for the devices of different standard sizes, improved reliability, simplified design.
• the nature of the invention consists of the pneumatic drive comprising the sequentially connected electropneumatic control device consisting of limit switches, electropneumatic valves, gasflow control units, a reversing jet engine with its shaft passing through the mechanical reducing gear furnished with the hand-operated doubler and through the crank screw gear comprising the housing, locating flange, sliding nut, guide, crank, drive kinetic energy absorbing unit, connected to the drive output shaft; lead screw and the drive movable parts kinetic energy absorbing unit are interconnected through the rod gear whereat the drive movable parts kinetic energy absorbing unit is accommodated inside the rotation gear housing in parallel to the lead screw.
• the nature of the invention is also that in the rod gear one end of the rod is flexibly bracketed to screw and crank gear housing and its other end is flexibly connected to the stick of the drive movable parts kinetic energy absorbing unit whereas the rod intermediate point is flexibly fixed to the lead screw.
• the nature of the invention is also that there is an option to alter the rod gear ratio through changing the lever arms by modifying the mutual alignment of the bracket, lead screw and the drive movable part kinetic energy absorbing unit.
• the nature of the invention is also that the flexible connection of the rod and the stick of the drive movable part kinetic energy absorbing unit is implemented by the shaped bolt, mounted into the rectangular grooves of the rod and in the straight hole in the stick of the drive movable part kinetic energy absorbing unit.
• the drive movable parts kinetic energy absorbing unit is implemented as a set of disc springs and two bushings assembled on the stick that is mounted inside the rotation gear housing in parallel to the lead screw axis with possible limitation of axial movement and is furnished with two retainer rings and flexibly connected to one end of the rod gear lever by a shaped bolt.
• the rod is connected to the lead screw by means of the double thrust bearing whereat the said bearing is accommodated inside the housing flexibly connected to the rod and the mid bearing collar is fixed on the lead screw whereat the two sides of the housing are equipped with the sliders which are movable inside two grooves made in the rod body.
• the rotation gear housing is made as a central body connected to the bottom and the cover whereat the housing is furnished with a through reference groove with parallel walls which accommodates the rectangular section guide with inner cylindrical laterally recessed cavity where the laterally projected sliding nut with self- sustaining thread is accommodated where its projections enter guide recesses whereat the sliding nut is located in the guide with lateral play where the nut is threaded to the lead screw where the guide has short trunnions with one slider on each trunnion which are flexibly located in the corresponding crank grooves.
• the flange is made of two parts one of which is fixed to the rotation gear housing and the second one is replacement part and is bolted to the first part.
• the nature of the invention is also that the reducing gear (11) of the drive is implemented with the possible alteration of the ratio due to installation of two replacement gear wheels sets.
• the flexible connection of the rod and the stick of the drive movable part kinetic energy absorbing unit is implemented by the shaped bolt mounted into the rectangular grooves of the rod and into the straight hole of the stick of the drive movable part kinetic energy absorbing unit; - owing to the fact that the drive movable parts kinetic energy absorbing unit is implemented as a set of disc springs and two bushings assembled on the stick that is mounted inside the rotation gear housing in parallel to the lead screw axis with possible limitation of axial movement and is furnished with two retainer rings and is flexibly connected to one end of the rod gear lever by a shaped bolt.
• the locating flange is made of two parts one of which being fixed to the rotation gear housing and the second being a replacement part and bolted to the first part. That permits to install the same drive onto different types and standard sizes of equipment;
• the drive movable parts kinetic energy absorbing unit implementation as a set of disc springs and two bushings assembled on the stick that is mounted inside the rotation gear housing in parallel to the lead screw axis with possible limitation of axial movement and is furnished with two retainer rings and is flexibly connected to one end of the rod gear lever by a shaped bolt. That permits to ensure the conditions when the maximum possible moment at the output shaft shall never exceed the rated permissible value, which shall allow the exclusion of the maximum transmitted moment restrain arrangement froir-Ahe drive that simplifies the design substantially and improves the drive reliability.
• the rotation gear housing is made as a central body connected to the bottom and the cover whereat the housing is furnished with a through reference groove with parallel walls which accommodates the rectangular section guide with inner cylindrical laterally recessed cavity where the laterally projected sliding nut with self-sustaining thread is accommodated and the projections thereof enter guide recesses whereas the sliding nut is located in the guide with lateral play whereas the nut is threaded to the lead screw whereat two side of the guide have short trunnions with one slider on each, which are flexibly located in the corresponding crank grooves. That permits to improve the operating reliability of the guide and sliding nut while accommodation thereof inside the guide cavity with the lateral play permits to avoid the nut seizure due to the process nonparallelism of the lead screw axis and the reference groove.
• Fig. 1 shows the pneumatic drive diagram
• Fig. 2 shows the top view of the crank screw rotation gear
• Fig. 3 shows the C-C sectional view of the Fig. 2
• Fig. 4 shows the A arrow view as of Fig. 2;
• Fig. 5 shows the shaped bolt
• Fig.6 shows the side view as of the Fig.5.
• the pneumatic drive (Fig.l) comprises sequentially connected electropneumatic control device 1, consisting of the limit switches 2, 3, electropneumatic valves 4, 5, with the inlets thereof connected to the source of the actuating medium - compressed gas (not shown) with P pressure, and the outlets thereof connected via the gasflow-control units 6, 7 to the nozzles 16, 17 of rotor 8 of the reversing jet engine 9.
• Output shaft 13 of engine 9 is equipped with gear rim 10 which is connected to drive output shaft 13 via the mechanical reducing gear 11 furnished with hand-operated doubler 12 (handwheel) and via the crank screw rotation gear 14 and further on to the controlled object 18, i.e. to the ball cock.
• the gear 14 comprises housing 21, crank screw drive consisting of the grooved crank 22 rigidly fixed to output shaft 15, lead screw 23 mounted inside housing 21 with the limited axial travel, which is connected to output of reducing gear 11 , sliding nut 24 (Fig. 3) installed on guide 25.
• Housing 21 of gear 14 is made as the central body 31 connected to bottom 32 and cover 33 (Fig 3). Inside the housing 21 the inner surface of central body 31 is furnished with a through reference groove 35 with parallel walls which accommodates the rectangular section guide 25 with inner cylindrical laterally recessed cavity where sliding nut 24 is accommodated with lateral projections 37 which enter the abovementioned recesses of guide 25. Sliding nut 24 is located in guide 25 with lateral plays (gaps). Nut 24 is connected by a self-sustaining thread to a lead screw 23. The two sides of guide 25 have shortened (as compared to the prototype) trunnions each of which is equipped with one of sliders 38, 39 which are flexibly fixed in the grooves of crank 22.
• Crank and screw rotation gear 14 includes the drive movable parts kinetic energy absorbing unit implemented as a set of disc springs 42 and two bushings 43, 44 assembled on the stick 45 mounted inside rotation gear housing 14 in parallel to the lead screw 23 axis with possible axial movement limitation.
• Stick 45 is equipped with two retainer rings 47, 48 and flexibly connected by shaped bolt 49 with one end of rod 50 of rod gear 51 the second end thereof being flexibly fixed (hinged) by bracket 52 to housing 21 of rotation gear 14.
• the intermediate point of rod 50 is flexibly connected to lead screw 23 by means of double thrust bearing 53.
• Bearing 53 is accommodated in housing 54 flexibly connected to rod
• the two sides of the housing 54 is equipped with trunnions 55, 56 (Fig. 4) with sliders 57, 58 which are flexibly located in two grooves made in the body of rod 50.
• Crank screw rotation gear 14 also comprises adjustable screw retainers 61, 62.
• Replacement locating flange 64 is joined to bottom 32 of housing 21 of rotation gear 14.
• the drive output shaft is connected to input roller 66 of electropneumatic control device 1 and further to moving permanent magnets 67, 68, linked by the magnetic field to limit switches 2, 3.
• the pneumatic drive operates as follows.
• the electropneumatic control device 1 When the electropneumatic control device 1 receives a control signal to rotate the output shaft 15 of the drive e.g. to electropneumatic valve 5, the latter is actuated and supplies the compressed gas via the gasflow control unit 7 from the compressed gas source into rotor 8 of jet engine 9. The compressed gas flowing out of nozzle 16 of rotor 8 creates the driving torque on shaft 13 of rotor 8.
• the driving torque of rotor 8 is transferred via gear rim 10 and reducing gear 11 to lead screw 23.
• lead screw 23 rotates the sliding nut 24 affixed thereto together with guide 25 moves along lead screw 23 and rotates crank 22 together with feed shaft 15 thus actuating the control element of the controlled object 18.
• the input roller 66 of pneumoelectric control device 1 connected to output shaft 15 and related to permanent magnets 67, 68 of limit switches 2, 3 rotates concurrently.
• crank 22 When crank 22 fits into the mechanical stop, e.g. 61, then crank 22, output shaft 15, guide 25, sliding nut 24 are stopped while lead screw 25 continues its rotation and threads into nut 24 moving rightwards along its axis to rotate rod 50 counterclockwise via thrust bearing 53, housing 54 and sliders 57, 58. Whereat the end of rod 50 via shaped bolt 49 moves stick 45 of the drive movable parts kinetic energy absorbing unit rightwards thus compressing the disc springs 42 through retainer 47 and bushing 44 which absorb the kinetic energy of the drive movable parts. Springs 42 are compressed until all kinetic energy of the drive movable parts is converted into the potential energy of the compressed springs 42 and the movement of lead screw 23, rotor 8 of jet engine 9 and other movable parts stops thereafter. Springs 42 cannot be released spontaneously as the thread of lead screw 23 and sliding nut 24 is self-sustaining.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Transmission Devices (AREA)
• Mechanically-Actuated Valves (AREA)

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Citations (5)

• 2002
  • 2002-04-01 RU RU2002108008A patent/RU2202056C1/ru not_active IP Right Cessation
  • 2002-12-26 AU AU2002361536A patent/AU2002361536A1/en not_active Abandoned
  • 2002-12-26 WO PCT/RU2002/000560 patent/WO2003083314A1/en not_active Application Discontinuation

Patent Citations (5)

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