EP1989721A1 - Unité d'axe de commande pour un système de contact électrique - Google Patents

Unité d'axe de commande pour un système de contact électrique

Info

Publication number
EP1989721A1
EP1989721A1 EP07711725A EP07711725A EP1989721A1 EP 1989721 A1 EP1989721 A1 EP 1989721A1 EP 07711725 A EP07711725 A EP 07711725A EP 07711725 A EP07711725 A EP 07711725A EP 1989721 A1 EP1989721 A1 EP 1989721A1
Authority
EP
European Patent Office
Prior art keywords
contact
switching shaft
switching
springs
rotary contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07711725A
Other languages
German (de)
English (en)
Inventor
Kurt Händler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Industries GmbH
Original Assignee
Moeller GmbH
Kloeckner Moeller GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Moeller GmbH, Kloeckner Moeller GmbH filed Critical Moeller GmbH
Publication of EP1989721A1 publication Critical patent/EP1989721A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position

Definitions

  • the invention relates to a switching shaft unit for an electrical, tilting contact system for use in an at least single-pole low-voltage switch with an insulating material.
  • spring elements are usually used to increase the contact force.
  • spring elements coil springs can be used which, depending on the design, act on the contact lever in the direction of the closed position of the contact system by means of tension or pressure.
  • the contact force reinforcement is used in one-armed and two-armed contact levers.
  • the use of symmetrically arranged contact force springs also allows the contact system can be stored with play.
  • two-armed contact levers it is possible to adjust the contact forces for different wear of the contact pieces. Despite asymmetry of the heights of the contacts and the associated change in position of the axis of rotation and the change in length of the lever arms of the attackingmaschinekraftfedem an approximate equality of the contact forces can be maintained.
  • Forming contact systems as tilting contact systems requires that a contact system have a tilt point position and that the contact lever or arm can pivot past this tilt point position.
  • a two-armed contact system with a sliding shaft mounted in a slot is known in which a respective contact force tension spring is arranged on both sides of the contact arm.
  • the tension springs are mounted on both sides in spring bolts, which are guided in parallel to the slot extending recesses of switching shaft segments and act on opposite engagement surfaces of the lever arms.
  • gearshift shaft units are designed in narrow space limits. In each case relatively small spring elements must be used. This results in a relatively small effective fulcrum distance.
  • the resulting contact forces are characterized by high tolerance susceptible. There is a high dispersion of the actual contact forces. After erosion of the contacts, the leverage changes and with them the contact force changes accordingly strong. To generate large closing forces high spring forces must be applied. Since shafts are usually made of plastic, there is a risk of deformation of the
  • a disadvantage of such embodiments is that a friction contribution is provided by the use of relatively many items with each part and that tolerances are introduced by the plurality of parts.
  • parts metallic products and plastic injection molded parts are used, which must be designed to match each other. Manufacturing tolerances of the parts are in a tolerance chain, which Bademd on the strength and uniformity of the contact forces on the position of the contact pieces (coverage) affects and thus generates abrasion and wear.
  • the object of the invention is to get a switch shaft unit for a tilting contact system as possible without enlarging the geometric dimensions and, if possible, by reducing the number of individual parts.
  • the contact force springs are designed as springs subjected to bending about their central axis.
  • leaf springs are used.
  • the arrangement should be claimed for a single or a double interrupting rotary contact.
  • the rotary contact may be formed as a one-armed or two-armed lever.
  • the contact force springs are paired-symmetrical to both sides of the rotary contact.
  • the rotary contact can move without obstruction by the springs of a slot limited move from one end position to the other end position and is guided by the rotational force of the contact force.
  • a wide range of pivoting of the force resulting from the spring position force vector is achieved, each with large effective lever arms in the position contact ON and flung in the contact position.
  • the device allows optimal leverage ratios.
  • the material loads (maximum edge stress) of the contact force springs are within manageable limits. Smaller forces occur and the manufacturing tolerances have less influence on the quality of the finished product. The relevant leverage conditions are described in detail in the description of the figures.
  • leaf springs are subjected to bending about their central axis, whereby they are not stretched flat, but at least once bulged.
  • the first version is that the leaf springs are formed with a single bulge.
  • the shape may be referred to as a U or V shape, where the tips of the V form the ends of the leaf springs and are each supported there.
  • Vertex of the bulge occurs the highest material tension (edge tension).
  • each leaf spring has two bulges which form an S-bend in which the ends of the S are the ends of the leaf springs and supported there respectively.
  • the bulges thus exceed both sides of the imaginary lines between the support points.
  • the flat side of the leaf springs is in each case perpendicular to the plane passed through by the rotary contact during a switching operation.
  • the position of the support points of the leaf springs depends on the selected shape of the leaf springs.
  • the S-shape requires a relatively symmetrical position of the support points with respect to the clearance in the shift shaft. Whereas the V-shape only has a bulge, and therefore the support points are moved out of a middle position and the bulge is then only on one side of the connecting line between the support points.
  • the respective ends of the leaf springs are the circular diameter of the bearing bolts (support points) bent so that they find there a lush pad.
  • the leaf springs are designed as double leaf springs. You can use both the springs in V-shape and in S-shape as a double sheet. In the description of the figures, the double leaf spring in V shape is shown and discussed in more detail.
  • the bulges of the leaf springs do not exceed the existing space within the switching shaft; the bulges are thus within this predetermined limit. However, even a small excess of this space allows the reduction of material requirements. The correspondingly larger and longer trained leaf springs would be charged with lower edge tension in larger space.
  • the distance of the support points is 7 to 8 mm.
  • the distance is shortened by 3 to 4 mm; Accordingly, the leaf springs are bending claimed.
  • the springs can apply forces of the order of 50 N. Since the spring force results from the spring travel and the spring constant, the material quality (spring constant) can be selected to smaller values with a relatively large spring travel. It also becomes clear from such dimensional considerations that a final tolerance (from the production chain and the possible clearance of the parts) of 0.3 mm with a travel of 3 mm amounts to approximately 10%. To keep tolerances in a variety of parts below a value of a few 100 microns is extremely expensive.
  • the contact force springs are subject to an increasing curvature during the movement through the tilting point plane out of the basic position.
  • the edge areas of the bulge creates the largest material tension.
  • the largest edge tension in the case of leaf springs can be about 1800 N / mm 2
  • coil springs working on pressure for example those in DE 38 12 950 C2, there by the reference numeral 39
  • the maximum material tension is 5% higher
  • investigations have shown that in the further embodiment "double-leaf spring”, the highest edge stress is 5% below the former value.
  • the Federblattst Shape the double-leaf spring are thinner, but both absorb the forces. Therefore, in each double sheet, the edge tension does not reach the maximum value as in a single spring.
  • an S-shaped leaf spring may be longer (viz. Its flexible length) than a V-shaped leaf spring. Therefore, a leaf spring in V-shape would have to be made thicker than a leaf spring in S-shape in order to provide the same material tension.
  • at least one guide contour is present on the rotary contact, which cooperates with a leading edge on the switching shaft segment during a rotary movement of the rotary contact. Edge and contour are set with play, so that the rotary contact in the vicinity of the tilting point plane can dodge only slightly, which in the critical case would lead to a 'breakout' from the tilting point. Another advantage is that there is as little friction as possible when adjusting the edge and contour with play.
  • a introduced with the same reasons feature is that the rotary contact is rotatably supported in the switching shaft segment about a guide axis in a slot play.
  • the device should preferably be used in circuit breakers or motor protection switches.
  • Fig. 1 the schematic representation of a double interrupting contact system
  • Fig. 2 an embodiment with S-shaped leaf springs in the closed position of the contacts
  • Fig. 4 an embodiment with S-shaped leaf springs in the open position of
  • Fig. 5 an embodiment with double leaf springs in the closed position of the contacts.
  • the contact system formed for one pole of a multi-pole circuit breaker by an actuating mechanism, not shown transferred from the off to the on position and vice versa.
  • a short-circuit current occur repulsive electrodynamic forces, which flings the rotary contact from a closed position to a repelling position.
  • the contact system is equipped with a Kippsprungtechnik, which is rotationally symmetrical to the bearing axis.
  • Zeichnerisch not shown is a proposed embodiment with a one-armed rotary contact.
  • Fig. 1 shows schematically the Kippsprungtechnik, which is composed of the two-armed rotary contact 8, the switching shaft segment 20 and the two pairs of contact pressure springs 40, 42, 44.
  • the necessary contact pressure between the pairs of contact pieces is generated by the contact force springs 40, 42, 44 formed as leaf springs (preferably made of spring steel).
  • the force vectors of the springs pass through the axis of rotation 26 of the rotary contact, whereby the tilting point plane T is formed.
  • the rotationally symmetrical rotary contact 8 has two lever arms 8A and 8B, which are provided at their ends with a respective movable contact piece 11 A and 11 B.
  • the contact pieces 11 A, 11 B occur in a closed contact system, each with a fixed contact piece 15 A and 15 B on a connecting rail 14 A and 14 B in electrical connection.
  • a pair of leaf springs 40, 42, 44 is clamped between a bearing pin 10 on the rotary contact and a support in the control shaft.
  • the support 22 for the leaf springs consists of a shaft 22 formed between the inner walls of the control shaft 20.
  • the leaf springs engage with their one end 4OA (42A, 44A) on the switching shaft segment 22 and with their other end 4OB (42B, 44B) on one of Lever arms 8A and 8B on.
  • the contact force springs generate pressure in the action direction W (see Fig. 3 or 4).
  • the direction of action in each case extends over the ends 4OA and 4OB.
  • On both sides of the rotary contact 8 each two contact force springs are arranged so that the rotary contact can move freely.
  • the figures are to be read as longitudinal sections, so that only a pair of the contact force springs are visible.
  • the first ends 40A (42A, 44A) and the second ends 40B (42B, 44B) of the contact force springs are diametrically opposed with respect to the axis 26 (in the shift shaft). If the rotary contact is spun on in the event of a short circuit, the contact force springs and with them the resulting forces pivot over the tilting point plane T, so that a restraining torque acts on the rotary contact. It shifts the line connecting the bearing pin 10 and the support 22 on the tilting point T and the rotary contact 8 remains in the open position.
  • Fig. 4 shows an open position.
  • At the rotary contact 8 at least one circular guide contour 9 is present, which cooperates with the circular guide edge 29 on the switching shaft segment during a rotational movement of the rotary contact.
  • two guide contours 9 and two complementary leading edges are present here. Edge and contour are set with game.
  • the game of storage of the rotary contact in the shift shaft may be approximately in the range of 100 microns.
  • the play between leading edge (s) 29 and guide contour (s) 9 is less critical in the contact system than the play of the leading axis, so its value should always be less than the play tolerance between edge and contour.
  • the rotary contact is formed with a slot 30, the longitudinal extent should extend as possible in a direction in which a game movement can be allowed. Perpendicular to the longitudinal extent, the rotary contact has the best guidance, whereby it is achieved, for example, that it is not possible to escape from the contact overlay in the closed position of the contacts. In most cases, however, a compromise of the position of the longitudinal direction of the slot is selected, which should be indicated here in Fig. 1 as an inclined position.
  • Fig. 2 shows a section perpendicular through the switching shaft segment 20, the position of Contact force springs 42 with two bulges in S-shape bend and their supports (shafts 22). The bulges of the leaf springs 42 are within the limit 28 of the space of the switching shaft 20.
  • Fig. 5 is a representation is shown, where the contact force springs (44) exceed the limit. The contacts are in closed position.
  • the rotary contact 8 is indicated by dashed lines.
  • the leaf springs have a width of 5 mm and a thickness of between 0.4 and 0.5 mm, with the rotary contact a Width of 4 mm, the clearance in the selector shaft is in this case about 10 mm wide.
  • Fig. 3 shows the embodiment with V-shaped leaf springs 40, the support (22) or attack points (10) of the leaf springs, without closer reproduction of the switching shaft and the rotary contact in the open position of the contacts again. All other details are omitted; it is still visible the bearing axis 26 and the lines of action W.
  • the embodiment with S-shaped leaf springs 42 is shown comparable to FIG. 3 (contact in the open position). Furthermore, the radii R1 and R2 are shown in Fig. 4 for explaining the leverage ratios of the contact force springs.
  • the attack point 10 moves on the circle with radius R2 with the schematically indicated swivel angle SW.
  • the torque which can be generated by the leaf spring 42 is determined by the spring strength and the lever arm H.
  • the sketch clearly shows that the maximum spring tension is inversely related to the lever arm. The larger the lever arm, the smaller the spring tension can be. With longer lever arms, the use of weaker springs is possible. This means that it is favorable under the aspect of the material load to make the use of space as possible so that large lever arms are present.
  • the force ratios of the position of the support 22 and engagement points 10 are dependent, that is, of course, in relation to the various embodiments, the force ratios are dependent on the selected shape of the leaf springs.
  • a leaf spring in V-shape has more favorable stress conditions because it is supported deep in the stem and the point of action 10 can make a relatively long travel on the circle of radius R2.
  • Fig. 5 shows the embodiment with double leaf springs 44 in the closed position the contacts. Both pairs of double-leaf springs 44 are shown in perspective. It is clear that in each case two pairs of the contact force springs (40, 42, 44) of the same embodiment are used for each exemplary embodiment.
  • the line of action W extends at the top left and bottom right with a relatively large distance (H) on the axis of rotation 26 at.
  • H relatively large distance
  • the outline of the shift shaft segment is shown in phantom to illustrate that lie in this embodiment, the bulges of the leaf springs 44 outside the boundary 28 of the space of the shift shaft 20. This gives you a greater length of the leaf springs, which can reduce the maximum edge tension of the leaf springs.
  • the present invention is not limited to the embodiments described above in the figures, but also includes all the same in the context of the invention embodiments.
  • the invention can be used for a single as well as a double interrupting rotary contact.
  • the design of the lever arm, its storage in the selector shaft and the position of the bearing points for the lever arm and the leaf springs should be varied accordingly.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Abstract

L'invention concerne une unité d'axe de commande pour un système de contact électrique destinée à être utilisée dans un commutateur à basse tension au moins unipolaire muni d'un boîtier en matériau isolant, l'unité d'axe de commande comprenant un contact (8) tournant à simple ou à double coupure réalisé sous la forme d'un levier et pouvant être déplacé dans un axe (20) de commande. Les bras (8A, 8B) de levier du contact tournant comportent au moins un élément (11A, 11B) de contact qui entre en contact de commutation avec au moins un contact (15A, 15B) fixe. Le contact (8) tournant est sollicité par au moins une paire de ressorts (40, 42, 44) de renforcement du contact, chaque ressort (40, 42, 44) à force de contact s'appuyant avec sa première extrémité (40A) sur un appui (22) à l'intérieur (28) de l'axe (20) de commande et avec sa deuxième extrémité (40B) sur un goujon (10) support sur le contact (8) tournant, un mouvement d'ouverture provoquant un décalage sur un plan de point de basculement T de la ligne de liaison entre le goujon (10) support et l'appui (22), après quoi le contact (8) tournant demeure dans la position d'ouverture. Il est proposé de configurer les ressorts à force de contact sous la forme de ressorts (42) à lame réagissant à la flexion.
EP07711725A 2006-03-02 2007-03-01 Unité d'axe de commande pour un système de contact électrique Withdrawn EP1989721A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006009645A DE102006009645A1 (de) 2006-03-02 2006-03-02 Schaltwelleneinheit für ein elektrisches Kontaktsystem
PCT/EP2007/001748 WO2007098943A1 (fr) 2006-03-02 2007-03-01 Unité d'axe de commande pour un système de contact électrique

Publications (1)

Publication Number Publication Date
EP1989721A1 true EP1989721A1 (fr) 2008-11-12

Family

ID=38008200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07711725A Withdrawn EP1989721A1 (fr) 2006-03-02 2007-03-01 Unité d'axe de commande pour un système de contact électrique

Country Status (5)

Country Link
US (1) US20090127083A1 (fr)
EP (1) EP1989721A1 (fr)
CN (1) CN101395689A (fr)
DE (1) DE102006009645A1 (fr)
WO (1) WO2007098943A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027582B4 (de) * 2008-06-10 2011-03-17 Siemens Aktiengesellschaft Schaltvorrichtung zur Doppelunterbrechung
DE102010014428A1 (de) * 2010-04-01 2011-10-06 Siemens Aktiengesellschaft Schalter, insbesondere Leistungsschalter
CN108139240B (zh) * 2015-10-27 2021-02-26 舍弗勒技术股份两合公司 具有用于提供多种工作电压的内置电气线路的轴承装置
CN108091500B (zh) * 2016-11-23 2021-05-18 浙江正泰电器股份有限公司 双断点触桥的压力自平衡结构
EP3457422B1 (fr) * 2017-09-15 2021-04-14 ABB Schweiz AG Interrupteur électrique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736174A (en) * 1987-04-23 1988-04-05 General Electric Company Molded case circuit breaker operating mechanism
FR2622347B1 (fr) * 1987-10-26 1995-04-14 Merlin Gerin Dispositif de coupure pour un disjoncteur multipolaire a contact rotatif double
IT1292453B1 (it) * 1997-07-02 1999-02-08 Aeg Niederspannungstech Gmbh Gruppo rotante di contatti per interrutttori di alta portata
JP4356267B2 (ja) * 2001-05-28 2009-11-04 富士電機機器制御株式会社 配線用回路しゃ断器
DE10219022B3 (de) * 2002-04-27 2004-03-18 Moeller Gmbh Kontaktanordnung für strombegrenzende Schutzschalter
DE10358828A1 (de) * 2003-12-16 2005-07-14 Moeller Gmbh Elektrodynamisch kippendes Kontaktsystem für Leistungsschalter
US7189935B1 (en) * 2005-12-08 2007-03-13 General Electric Company Contact arm apparatus and method of assembly thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007098943A1 *

Also Published As

Publication number Publication date
DE102006009645A1 (de) 2007-09-06
US20090127083A1 (en) 2009-05-21
CN101395689A (zh) 2009-03-25
WO2007098943A1 (fr) 2007-09-07

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