Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/227—Interlocked hand- and power-operating mechanisms
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
  • H01H3/3005—Charging means
  • H01H3/3021—Charging means using unidirectional coupling
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
  • H01H2003/3084—Kinetic energy of moving parts recuperated by transformation into potential energy in closing or opening spring to be used in next operation
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
  • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
  • H01H2003/3094—Power arrangements internal to the switch for operating the driving mechanism using spring motor allowing an opening - closing - opening [OCO] sequence
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
  • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
  • H01H33/66—Vacuum switches
  • H01H33/666—Operating arrangements

Definitions

• the invention relates to a device for tensioning the closing spring of drive devices for electrical circuit breakers, in particular vacuum circuit breakers, in which the closing spring designed as a tension spring is connected to the eccentric mounted on the closing shaft and both by an electric motor and by a hand ⁇ winding shaft with the interposition of a spur gear, the last spur gear is also arranged on the switch-on shaft, which also carries the pawl for releasing a switch-on process by the switch-on shaft and the cam disc that is operatively connected to the switch-on lever.
• the closing spring is connected to an eccentric located on a closing shaft, so that when a pawl also arranged on the closing shaft is released, a cam disc also provided on the closing shaft rotates about 180 °, due to the action of the switch-on spring designed as a tension spring, it presses the switch-on lever that is operatively connected to the cam disc into a position that corresponds to the switch-on position.
• the preparation of the switch-on spring, which is designed as a tension spring, for the next switch-on process, that is, its tensioning, can thus be carried out, such as the VEM company specification " ⁇ l poor indoor power switch” Hn / 65 / 77- 10000-7.77-IV / l / 17-565 - April 1976 VEB GmbHtechnik Oberau can be taken of by by applying a control voltage to an electric motor with the interposition of a transmission , which cooperates with a push rod, a ratchet disc is rotated so that the closing spring which is eccentrically attached to this ratchet disc is tensioned.
• a transmission is also provided for actuating the movable switch contact in high-voltage switching devices according to DD 296 378 A5.
• the gear arranged between the electric motor and the closing shaft is a spur gear, the last spur gear of which is loosely mounted on the closing shaft is.
• the last spur gear of the spur gearbox which is loosely mounted on the switch-on shaft, has a circular segment-shaped projection in the area of the switch-on shaft. After passing through an idle area, the circular segment Mige projection of the loosely mounted spur gear on a driver pin firmly connected to the closing shaft takes the closing shaft and thus the eccentric by turning it again by approx. 180 °, and the closing spring is tensioned so that the vacuum circuit breaker is prepared for the next closing process .
• the invention is based on the object of a device for tensioning the closing spring of drive devices for electrical circuit breakers, in particular vacuum circuit breakers, in which the closing spring designed as a tension spring is connected to the eccentric mounted on the closing shaft and both by an electric motor . and can also be tensioned by a manual winding shaft with the interposition of a spur gear, the latter being also arranged on the switch-on shaft, which also carries the pawl for releasing a hold-in process by the switch-on shaft and the cam disc which is operatively connected to the switch-on lever to create, in which the spur gear works without idling and prevents or limits the turning back of the eccentric by the closing spring after switching on, and the clamping of the closing pawl on the pawl connected to the closing shaft is avoided when preparing the circuit breaker for the next closing operation.
• this is achieved in that the last spur gear of the spur gear is arranged on the switch-on shaft via a freewheel bearing, such that when the switch-on spring begins to tension, the eccentric and thus the switch-on shaft from a position in which it is in one position Find position, which lies in the direction of rotation of the eccentric upward behind the bottom dead center of the switch-on shaft, can be carried directly by the last spur gear, while in the phase of the switch-on process when the switch-on shaft rotates past its bottom dead center last spur gear is locked in position by the freewheel bearing and by the operative connection with the other spur gears of the spur gear.
• the freewheel bearing consists of the actual freewheel and one support bearing arranged on both sides of the freewheel.
• Both the freewheel and the two support bearings of the freewheel bearing are preferably needle bearings, and any other bearing can also be used without restricting the function of the freewheel bearing.
• the inner ring of the freewheel of the freewheel bearing is formed by the outer circumferential surface of the switch-on shaft and the diameter of the needles of the freewheel is smaller than the distance between the outer circumferential surface of the switch-on shaft and the inner circumference of the
• Outer ring of the freewheel, and sawtooth-shaped surfaces are evenly distributed on the inner circumference of the outer ring, such that their greatest distance from the inner circumference of the outer ring is always provided on the opposite side of the sawtooth-shaped surfaces in the direction of rotation.
• the am inner circumference of the outer ring of the freewheel arranged sawtooth-shaped surfaces a slight slope.
• the needles of the freewheel of the freewheel bearing which act when the closing spring is tensioned against the sawtooth-shaped surfaces with a slight pitch, are under the force of spring bodies in such a way that they act on the sawtooth-shaped surfaces of the outer ring of the freewheel. So in the clamping direction, can be pressed, so that it is ensured that immediately when the multi-stage spur gear is actuated by an electric motor or by a manual winding shaft through the last gearwheel, which is seated on the switch-on shaft, the switch-on shaft and thus also on the switch-on shaft ⁇ ordered eccentric is taken so that the closing spring connected to the eccentric is tensioned in preparation for the next switching-on process.
• the spring bodies which act on the needles of the freewheel of the freewheel bearing are preferably spring clips which are supported on the outer ring of the freewheel of the freewheel bearing.
• the invention also includes the use of any other spring element which acts on the needles of the freewheel and deviates from the spring clip.
• the invention thus provides a device for tensioning the closing spring of drive devices for electrical circuit breakers, in particular vacuum circuit breakers, in which the last spur gear of the spur gear is connected to the closing shaft via a freewheel bearing. This results in shorter clamping times for tensioning the closing spring and also ensures that the spur gear - 6 -
• the last spur gear does not rotate, taking into account the freewheel bearing via which it is arranged on the switch-on shaft, but also because the teeth of this spur gear mesh with the teeth of the next spur gear of the spur gear.
• a preferred embodiment of the device consists in that a single-stage spur gear is connected to the last spur gear arranged on the freewheel bearing on the engagement shaft, the spur gear with the largest diameter of which is attached to the spur gear with a smaller diameter attached to the manual winding shaft Is engaged, and on the hand-winding shaft a free-wheel bearing is also arranged, which receives a collar provided with a collar, on the outer circumference of which a return spring is arranged, one end of which is arranged on a collar arranged on the stop element and the second end of which is attached to a stop element by two stop elements arranged on the rear wall of the switch drive.
• the return spring which is advantageously a torsion spring
• the two stop elements attached to the rear wall of the switch drive can be arranged offset, for example, by 180 ° to one another. It is possible to achieve the effect achieved by the staggered arrangement of the stop elements at a different angle, for example if they are staggered by 30 ° to one another.
• the manual winding shaft is preferably mounted in the rear wall of the switch drive and also in its front wall.
• the eccentric element is turned back by the closing spring in the direction of the bottom dead center of the to avoid switching shaft, but at least to limit it so that when the switch-on spring begins to tension, the eccentric and thus the switch-on shaft assume a position that lies in the direction of rotation of the cam upwards behind the bottom dead center of the switch-on shaft, but especially also
• the angle of rotation of the eccentric as well as after the stop is turned on both after the circuit-breaker is switched on the pawl connected to the switch-on shaft on the switch-on shaft limits the angle of rotation of the pawl.
• both stop elements together with the freewheel bearing and the one with a collar provided with a collar for the single-stage spur gear and thus for the switch-on shaft form a backstop.
• the freewheel bearing when preparing the circuit breaker for the next switch-on operation, by actuating the single-stage spur gear via the electric motor as the elevator motor or the manual winding shaft, releases the collar provided with the collar, so that by releasing the return spring, the socket can be rotated in the opposite direction until the stop element connected to the socket strikes the second stop element arranged on the rear wall of the switch drive.
• the closing spring can be tensioned taking into account a low engine torque, but also to achieve a low speed of the last spur gear and thus the closing shaft, the single-stage gear has a large reduction.
• a gearbox is used as a single-stage spur gear transmission with a large reduction, which consists of an elliptical bushing which can be fitted onto the shaft of the electric motor and which receives an externally toothed elastic ring on its outer circumference via a ball bearing.
• FIG. 1 shows the switch-on shaft with the last spur gear of a spur gear set in the off position
• FIG. 2 shows the switch-on shaft with the last spur gear according to FIG. 1 in the switch-on position
• FIG. 3 shows a schematic illustration of the freewheel of a freewheel bearing via which the last spur gear is arranged on the switch-on shaft
• FIG. 4 shows a further schematic illustration of the freewheel according to FIG. 3 in the front view in connection with support bearings arranged on the end faces ,
• FIG. 5 shows the switch-on shaft in the switch-off position according to FIG. 1 in operative connection with a single-stage spur gear as well as the manual winding shaft
• FIG. 6 shows the switch-on shaft according to FIG. 5 in the switch-on position
• FIG. 7 is a top view of the switch-on shaft according to FIG. 6.
• the one connected to the eccentric 2 is shown as Tension spring trained closing spring 7 tensioned, that is, the drive device is prepared for triggering a closing process on the vacuum circuit breaker.
• the switching-on process is triggered by the release of the pawl 4 by a further pawl, likewise not shown, which belongs to the drive device. Is the switch-on process through
• the closing shaft 5, the eccentric 2 with the closing spring 7, the cam plate 3 and the pawl 4 should be in the position shown in FIG 1, in which the closing spring 7 is tensioned, the last spur gear 1 of the multi-stage spur gear unit immediately turns on the starting shaft 5 and, when the multistage spur gear transmission is actuated via the freewheel 6 so that the eccentric 2 is carried along until the eccentric 2 has the position corresponding to FIG. 1, in which the closing spring 7 is tensioned, that is to say prepared for triggering the next starting operation. Because the engaging shaft 5 and the eccentric 2 are taken directly by the multi-stage spur gear, the clamping times of the engaging spring 7 are shortened.
• the multi-stage spur gear starts up under load, which means that no idling occurs and wear is considerably reduced.
• the same advantages result when using a single-stage spur gear.
• the freewheel bearing 6, via which the last spur gear 1 of the multi-stage spur gear according to FIGS. 1 and 2 is arranged on the switch-on shaft 5, consists of the actual freewheel 10 and the two support bearings 11, which limit the freewheel 10 on the end face. Both the freewheel 10 and the support bearing 11 are needle bearings. As described in connection with FIG.
• the inner ring of the freewheel 10 is formed of Frei ⁇ running bearing 6 through the outer circumferential surface of the closing shaft 5, and in the intermediate space 12 between this beides ⁇ surface and the inner periphery of the outer ring 13 of the Freewheel 10 needles 14 are arranged, the diameter of which is smaller than the distance between the outer circumferential surface of the switch-on shaft 5 and the inner circumference of the outer ring 13 of the freewheel 10.
• These needles 14 are operatively connected to sawtooth-shaped surfaces 15 with a small pitch are evenly distributed on the inner circumference of the outer ring 13 of the freewheel 10, in such a way that their greatest distance from the inner circumference of the outer ring 13 is always on the opposite side of the direction of rotation (arrow direction 8 - FIGS. 1 and 2) sawtooth-shaped surfaces 15 is provided.
• the needles 14 of the freewheel 10 of the freewheel bearing 6 are under the force of spring bodies 16, which are designed as spring clips, so that the needles 14 can be pressed onto the sawtooth-shaped surfaces 15 of the outer ring 13 of the freewheel 10, that is to say in the clamping direction.
• FIG. 6 shows that the switch-on spring 7 is relaxed, the switch-on spring 7, the eccentric 7 and thus the switch-on shaft 5 being in a position which lies in the direction of rotation of the cam 2 upward behind the bottom dead center 9 of the switch-on shaft 5.
• a backstop 22 is additionally provided, as shown in FIG. 7, by means of which a limited reverse rotation angle is made available for turning the pawl 4 back.
• the backstop 22 also ensures, however, that after the switch-on process a possible reversal of movement of the switch-on shaft 5 with its components, ie also the switch-on spring 7, is at least prevented.
• the spur gear 23 with the largest diameter of the single-stage spur gear 17 meshes with a spur gear 24 with a small diameter attached to the manual winding shaft 21.
• a freewheel bearing 25 is arranged on the manual winding shaft 21, which receives a bushing 27 provided with a collar 26, on the outer circumference of which a return spring 28 is arranged. While one end 29 of the return spring 28 is fastened to a stop element 30 arranged on the bush 27, the second end 31 of the return spring 28 arranged on the shaft 32 of the bush 27 is offset by two by 180 ° with a stop element 33 other stop elements 33; .35 attached to the rear wall 34 of the switch drive.
• the manual winding shaft 21 is not only supported in the rear wall 34 but also in the front wall 36 of the switch drive.
• the freewheel bearing 25 releases the socket 27 provided with a collar 26, so that by relaxing the return spring 28, the sleeve 27 is rotated in the opposite direction. This rotation continues until the stop element 30 connected to the socket 27 strikes the second stop element 35 arranged on the rear wall 34 of the switch drive.
• a single-stage spur gear 17 with a large reduction ratio is provided, as is also known as a harmonic drive gear.
• the one ring 37 of two superimposed rings 37, 38 of this transmission is fastened to the housing 39 of the electric motor 20 and the second ring 38 carries a double spur gear 40, the spur gear 41 with the smallest diameter with the last one on the Einschaltwelle 5 an ⁇ arranged spur gear 18 is engaged.
• the device according to the invention simultaneously influences a reduction in the enclosed space in relation to the spur gear and thus the costs.

Landscapes

• High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Gear Transmission (AREA)
• Transmission Devices (AREA)
• Mechanical Operated Clutches (AREA)
• Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Mechanisms For Operating Contacts (AREA)
• Control Of High-Frequency Heating Circuits (AREA)

Priority Applications (16)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25935674

Family Applications (1)

Country Status (21)

Cited By (2)

Families Citing this family (5)

Citations (3)

• 1995
  • 1995-04-04 NZ NZ283744A patent/NZ283744A/en unknown
  • 1995-04-04 EP EP95915184A patent/EP0755564B1/de not_active Expired - Lifetime
  • 1995-04-04 AU AU22155/95A patent/AU690668B2/en not_active Ceased
  • 1995-04-04 WO PCT/EP1995/001232 patent/WO1995027992A1/de active IP Right Grant
  • 1995-04-04 DE DE59502684T patent/DE59502684D1/de not_active Expired - Fee Related
  • 1995-04-04 SK SK1228-96A patent/SK280118B6/sk unknown
  • 1995-04-04 DE DE19580313T patent/DE19580313D2/de not_active Expired - Fee Related
  • 1995-04-04 CZ CZ19962760A patent/CZ288683B6/cs not_active IP Right Cessation
  • 1995-04-04 AT AT95915184T patent/ATE167955T1/de not_active IP Right Cessation
  • 1995-04-04 BR BR9507461A patent/BR9507461A/pt not_active Application Discontinuation
  • 1995-04-04 MX MX9604525A patent/MX9604525A/es not_active Application Discontinuation
  • 1995-04-04 JP JP7526055A patent/JPH09511611A/ja active Pending
  • 1995-04-04 ES ES95915184T patent/ES2120741T3/es not_active Expired - Lifetime
  • 1995-04-04 HU HU9602642A patent/HU220213B/hu not_active IP Right Cessation
  • 1995-04-04 CN CN95192542A patent/CN1047461C/zh not_active Expired - Fee Related
  • 1995-04-04 DK DK95915184T patent/DK0755564T3/da active
  • 1995-04-10 MY MYPI95000917A patent/MY114088A/en unknown
  • 1995-04-11 TW TW084103488A patent/TW272295B/zh not_active IP Right Cessation
• 1996
  • 1996-10-08 BG BG100891A patent/BG62542B1/bg unknown
  • 1996-10-11 PL PL95316755A patent/PL176808B1/pl not_active IP Right Cessation
  • 1996-10-11 NO NO964343A patent/NO964343L/no not_active Application Discontinuation
  • 1996-10-11 FI FI964093A patent/FI964093A/fi unknown

Patent Citations (3)

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