EP0002686A1 - Disjoncteur multipolaire de puissance basse tension avec arbre de commutation portant des bras de contact - Google Patents

Disjoncteur multipolaire de puissance basse tension avec arbre de commutation portant des bras de contact Download PDF

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Publication number
EP0002686A1
EP0002686A1 EP78101560A EP78101560A EP0002686A1 EP 0002686 A1 EP0002686 A1 EP 0002686A1 EP 78101560 A EP78101560 A EP 78101560A EP 78101560 A EP78101560 A EP 78101560A EP 0002686 A1 EP0002686 A1 EP 0002686A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
bearing
voltage circuit
low
breaker according
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.)
Granted
Application number
EP78101560A
Other languages
German (de)
English (en)
Other versions
EP0002686B1 (fr
Inventor
Werner Troebel
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0002686A1 publication Critical patent/EP0002686A1/fr
Application granted granted Critical
Publication of EP0002686B1 publication Critical patent/EP0002686B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/48—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H2003/326—Driving mechanisms, i.e. for transmitting driving force to the contacts using bearings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H2009/0088—Details of rotatable shafts common to more than one pole or switch unit

Definitions

  • the invention relates to a multi-pole low-voltage circuit breaker with contact arms and a switching shaft supporting this, which is mounted in recesses in the partition walls of an insulating material housing and in these recesses insert pieces.
  • a circuit breaker of this type is known from GB-PS 1 244 890.
  • the control shaft forms a uniform component made of an insulating material with support arms for the movable contact pieces. This component has cylindrical sections between the support arms for storage.
  • the known switch has a three-pole design and has two insert pieces which are held together by a cross member and therefore likewise form a unitary component. This is fastened to the lower part of the isolator housing of the switch by means of screws.
  • the selector shaft In low-voltage circuit breakers with an insulating housing, it is also known to design the selector shaft as a polygonal shaft, to which the support arms designed as stamped parts of the movable contact pieces are fastened by bending or riveting processes.
  • the selector shaft has a metal core that has a round, also polygonal profile. This core is covered with an insulating material.
  • Switching shafts of this type (US Pat. No. 3,621,189) have a high mechanical strength and are therefore also suitable for mechanically stressed circuit breakers for high switching powers. With such switches in particular, the problem arises of carefully electrically isolating the adjacent pole tracks from one another. Sufficient creepage distances must be available for this, and switching gases must be prevented from passing from one pole track to the adjacent pole tracks.
  • the invention has for its object to provide a training and storage of the selector shaft satisfying the above requirements.
  • this object is achieved in that the selector shaft has a polygonal profile and axially displaceable bearing body with an opening adapted to the polygonal profile and at least one outer cylindrical bearing surface and a collar projecting above the bearing surface and that the bearing surfaces of the partitions and the insert pieces one Have the appropriate groove.
  • polygonal profile is to be understood to mean all cross-sectional shapes that enable a rotational connection with the bearing bodies, in particular thus symmetrical triangular or square profiles as well as round profiles with one or more projections or with a varying radius of curvature.
  • the collar attached to the bearing bodies provided according to the invention forms a step in connection with the corresponding grooves of the partition of the insulating material housing and the insert, which extends the creepage distance and prevents the passage of switching gases.
  • An essential property of the arrangement according to the invention is also that the axial length of the gap between the control shaft and the opening of the bearing body can be selected regardless of the thickness of the partition walls. In a development of the invention, the length of this gap can be dimensioned as a safety distance with regard to the formation of electrical creepage distances and with regard to the passage of switching gases.
  • the axial gap is selected for a given width so that the commonly occurring harmful influences, in particular soot-containing switching gases, cannot lead to the formation of a continuous conductive layer on the surface of the switching shaft.
  • control shaft be mounted precisely and with a low tolerance. This can be achieved in itself by bearing points acting as close as possible to the ends of the selector shaft. But even when the control shaft is mounted in the area of the partition walls of the insulating housing, low-backlash storage can be achieved within the scope of the invention in that the bearing surfaces of the bearing bodies are arranged on the outer side of the collar, as seen in the axial direction of the control shaft.
  • the bearing body with a further bearing surface which is located axially on the inside with respect to the federal government and which, when the switch is in an operational state, are at a short distance from a stationary stop surface.
  • This stop surface ensures that the switch is mechanically fully functional even when the inserts are removed.
  • An edge of a bearing plate of the key switch attached to the lower part of the housing can serve as a stop surface.
  • the measure provided according to a development of the invention has the effect of providing a separate insert for each partition. This eliminates the traverse provided in the known insert pieces for connection.
  • the inserts With their bearing surfaces, the inserts absorb above all those forces which are exerted on the selector shaft by the restoring forces of the movable contact pieces. It is therefore necessary to secure the inserts against displacement under the action of these forces. This can be done in an advantageous manner in that the inserts are fastened in their operating position between the upper part and the lower part of the insulating material housing of the switch by positive locking. The forces are thus transmitted to the upper part of the housing, which with the Lower part can be connected in the usual way by screws.
  • Fig. 1 shows a low-voltage circuit breaker in a side view with a schematically illustrated current path.
  • FIG. 2a shows a simplified cross section through the switch according to FIG. 1 in the region of the selector shaft.
  • FIG. 2b is the section designated II-II in FIG. 2a.
  • FIG 3 shows a bearing body for the selector shaft in a perspective view.
  • FIG. 4a illustrates the interaction between a partition, a control shaft and an insert.
  • the section designated IV-IV in FIG. 4a is shown in FIG. 4b.
  • the switch 1 shown schematically in Fig. 1 has a housing 2 made of insulating material, for. B. a molding material based on polyester resin.
  • the housing 2 is divided into an upper part 3 and a lower part 4 along a parting line.
  • the current path of the switch 1 extends from a connecting terminal 5 via a fixed contact 6 and a moving contact 7 as well as a flexible conductor strip 10 and a heating conductor 11 to a further connecting terminal 12.
  • the movable contact piece 7 is attached in an articulated manner to a carrier 13, which is mounted on a control shaft 14 is attached.
  • a drive lever 16 engages, which can be moved in a known manner by a mechanism, not shown.
  • a manual operating handle 17, which protrudes from the upper part 3 of the housing 2, is used to switch the circuit breaker 1 on and off by hand. From the switch-on position shown, the movable contact piece 7 can be moved into the switch-off position not only by the actuating handle 17, but also in a known manner by thermal and / or magnetic triggers. If the circuit breaker 1 is of multi-pole design, each pole has the structure shown in FIG. 1, but the drive lever 16 only acts on one of the pivot pins 15, in the case of three-pole switches preferably on the movable contact piece 7 of the middle pole.
  • the control shaft 14 has a core made of metal in the form of a round rod 20 with a circular cross section. This round rod is provided with a covering 21 made of insulating material.
  • the contact carriers 13, which are designed as stamped and bent parts, are fastened next to one another on this envelope.
  • the control shaft 14 is mounted in the partitions 22 of the lower part 4 of the housing 2 by means of two bearing bodies 23, which are shown separately in perspective in FIG. 3. Insulating plastics of sufficient strength, in particular thermosetting molded materials, are suitable for producing the bearing body 23.
  • the bearing bodies 23 have an opening 24 which is adapted to the cross-sectional shape of the selector shaft 14 and is dimensioned such that the bearing bodies 23 can be displaced on the selector shaft 14 with little play.
  • the axial length of the bearing body 23 and thus the opening 24 is chosen so that there is a given Game between the bearing bodies 23 and the selector shaft 14 provides sufficient security against the passage of switching gases along the surface of the selector shaft 14 and against the formation of conductive layers on the selector shaft.
  • the axial length of the bearing body 23 thus corresponds to a safety distance between the adjacent pole tracks, which are located on either side of the partition walls 22.
  • the bearing bodies 23 each have a bearing surface 25 and a further bearing surface 26 with a smaller diameter than the bearing surface 25. Between the two bearing surfaces there is a disk-like collar 27 projecting above the bearing surfaces. Between the collar 27 and the bearing surface 26, the bearing bodies 23 have a further cylindrical shoulder 28, the diameter of which lies between the diameter of the bearing surface 25 and the diameter of the bearing surface 26.
  • the partitions 22 of the lower part 4 of the housing 2 are provided with recesses 30, the lower region of which is designed as a bearing shell 31 with a radius adapted to the bearing surfaces 25.
  • a groove 32 is also provided for the collar 27 of the bearing body 23.
  • the grooves 32 are extended beyond the area of the bearing shell 31 to the upper edge of the partition walls 22 (FIG. 4b).
  • the grooves 33 and 34 are offset from the groove 32. The grooves 33 and 34 are used to insert inserts 35, which are explained below.
  • the insert pieces 35 likewise consist of an insulating plastic and are designed as bearing shells 36 at their lower ends. As a result, together with the bearing shells 31 of the recesses 30, the bearing surfaces 25 of the bearing bodies 23 completely enclose bearings. To receive the collar 27 of the bearing body 23, the insert pieces 35 are also each provided with a groove 37. Furthermore, the inserts have ribs 40 and 41 for guidance in the grooves 33 and 34 of the partition walls 22.
  • the thickness of the insert pieces 35 corresponds in the lower region, which interacts with the bearing bodies 23, to the axial length of the bearing bodies minus the bearing surface 26 (dimension a in FIG. 2a).
  • the insert pieces 35 are made thinner, in accordance with the thickness of the partition walls 22, which only have the thickness a shown in FIG. 2b in the area of the bearing shells 31, but are otherwise made thinner (dimension b in FIG 2a).
  • the bearing bodies 23 have a cylindrical shoulder 28 on the side axially inside with respect to the collar 27, the diameter of which is slightly smaller than the diameter of the bearing surface 25. This creates a small gap between the cylindrical projection 28 and the bearing shells 31 and 36 of the partition walls 22 and the insert pieces 35.
  • the axially outer bearing surfaces 25 are effective as bearing surfaces during operation of the switch. This results in a relatively low-play mounting of the control shaft 14.
  • the further bearing surfaces 26 of the bearing bodies 23 only become effective when the upper part 3 of the insulating housing 2 with its partitions 42, shown broken off in FIG. 2b, from the lower part part 4 is removed.
  • the selector shaft 14 is then pressed under the influence of restoring forces exerted by the switching mechanism, not shown, with the inserts 35 with their ribs 40 and 41 in the grooves 33 and 34 being displaced upward.
  • the other bearing surfaces 26 of the bearing bodies 23 bear against stop surfaces 44 of bearing plates 43, which are held on the bottom of the lower part 4 by schematically indicated fastening means 45.
  • the bearing plates 43 are arranged between the partitions 22 and serve to accommodate the drive mechanism mentioned and the key switch.
  • the parts are dimensioned so that in the operating state of the switch between the bearing plates 43 and the bearing surfaces 26 there is an intermediate space c which can be of the order of a tenth of a millimeter. It should be pointed out that the differences in the diameters of the bearing surfaces 25 and 26 and of the cylindrical extension 28 are more clearly emphasized in illustration than in reality in FIGS. 2a and 2b.
  • the control shaft 14 is inserted with the bearing bodies 23 displaceable on it in the axial direction into the lower part 4 of the housing 2 in such a way that the bearing bodies engage with their collars 27 in the grooves 32. Then the bearing plates 43 are inserted between the partitions 22 and fastened to the bottom of the lower part 4 in a suitable manner.
  • the selector shaft 14 is thereby fixed in its operating position except for the small dimensional deviation c mentioned and can be operated on a trial basis.
  • the final storage of the control shaft 14 results after the insertion of the inserts 35 with their ribs 40 and 41 in the grooves 33 and 34 and the subsequent placement of the upper part 3 on the lower part 4, which is then connected to the upper part 3 by suitable connecting means, for. B. screws, is connected.
  • suitable connecting means for. B. screws
  • the bearing bodies 23 can automatically adapt to the spacing of the partition walls 22 or the grooves 32 due to their displaceability on the control shaft 14.
  • the insert pieces 35 can be assembled in a simple manner because they are independent of one another and thus jamming or jamming is avoided.

Landscapes

  • Breakers (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP19780101560 1977-12-22 1978-12-04 Disjoncteur multipolaire de puissance basse tension avec arbre de commutation portant des bras de contact Expired EP0002686B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772757696 DE2757696C2 (de) 1977-12-22 1977-12-22 Mehrpoliger Niederspannungs-Leistungsschalter mit einer Kontaktarme tragenden Schaltwelle
DE2757696 1977-12-22

Publications (2)

Publication Number Publication Date
EP0002686A1 true EP0002686A1 (fr) 1979-07-11
EP0002686B1 EP0002686B1 (fr) 1981-11-25

Family

ID=6027122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780101560 Expired EP0002686B1 (fr) 1977-12-22 1978-12-04 Disjoncteur multipolaire de puissance basse tension avec arbre de commutation portant des bras de contact

Country Status (3)

Country Link
EP (1) EP0002686B1 (fr)
JP (1) JPS5821375B2 (fr)
DE (1) DE2757696C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292850A2 (fr) * 1987-05-28 1988-11-30 Mitsubishi Denki Kabushiki Kaisha Interrupteur multipolaire
GB2282265A (en) * 1993-09-10 1995-03-29 Kloeckner Moeller Gmbh Switch with rotatable actuating shaft
WO2000054297A1 (fr) * 1999-03-08 2000-09-14 Moeller Gmbh Disjoncteur multipole

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757696C2 (de) * 1977-12-22 1984-10-04 Siemens AG, 1000 Berlin und 8000 München Mehrpoliger Niederspannungs-Leistungsschalter mit einer Kontaktarme tragenden Schaltwelle
DE3045568C2 (de) * 1980-11-28 1982-10-28 Siemens AG, 1000 Berlin und 8000 München Motorantrieb für Niederspannungs-Schutzschalter
DE3046928C2 (de) * 1980-12-10 1988-12-01 Siemens AG, 1000 Berlin und 8000 München Abdeckung für die Klemmen von Schutzschaltern
DE3432726A1 (de) * 1984-09-06 1986-03-13 Licentia Gmbh Anordnung zur lagerung einer welle in taschenartigen ausnehmungen eines lagerteiles
JPH086357Y2 (ja) * 1987-12-16 1996-02-21 富士電機株式会社 多極回路遮断器
US4866225A (en) * 1988-09-08 1989-09-12 Siemens Energy & Automation, Inc. Insulated light weight metallic crossbar in polyphase circuit breaker assemblies for inhibiting arcing
JP2566346B2 (ja) * 1991-06-25 1996-12-25 松下電工株式会社 回路遮断器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR654492A (fr) * 1927-10-29 1929-04-06 Brown Interrupteur multipolaire avec dispositif de protection contre les amorçages d'arcsentre pôles au moment de la rupture
FR1140468A (fr) * 1954-12-09 1957-07-23 Westinghouse Electric Corp Interrupteur à extinction d'arc à contacts visibles
US3073927A (en) * 1959-10-16 1963-01-15 Westinghouse Electric Corp Circuit breakers
DE2757696B1 (de) * 1977-12-22 1978-11-02 Siemens Ag Mehrpoliger Niederspannungs-Leistungsschalter mit einer Kontaktarme tragenden Schaltwelle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1070724B (fr) * 1959-12-10
DE369463C (de) * 1921-07-15 1923-02-19 Siemens Schuckertwerke G M B H Schlagwetterdichte Wellendurchfuehrung
DE569237C (de) * 1930-03-12 1933-01-31 Aeg Isolationsanordnung, insbesondere fuer elektrische Schaltgeraete
DE828415C (de) * 1949-07-05 1952-01-17 Peterreins & Co K G Elektrischer Schalter
DE1425994A1 (de) * 1964-08-21 1969-11-20 Metzeler Ag Kunststoff- oder Gummi-Kunststoff-Gleitlager mit Torsionsmanschetten-Dichtung
CH489887A (it) * 1968-04-13 1970-04-30 Bassani Spa Interruttore elettrico di potenza
US3621189A (en) * 1970-08-26 1971-11-16 Cutler Hammer Inc Inkage contact operating mechanism for electric circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR654492A (fr) * 1927-10-29 1929-04-06 Brown Interrupteur multipolaire avec dispositif de protection contre les amorçages d'arcsentre pôles au moment de la rupture
FR1140468A (fr) * 1954-12-09 1957-07-23 Westinghouse Electric Corp Interrupteur à extinction d'arc à contacts visibles
US3073927A (en) * 1959-10-16 1963-01-15 Westinghouse Electric Corp Circuit breakers
DE2757696B1 (de) * 1977-12-22 1978-11-02 Siemens Ag Mehrpoliger Niederspannungs-Leistungsschalter mit einer Kontaktarme tragenden Schaltwelle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0292850A2 (fr) * 1987-05-28 1988-11-30 Mitsubishi Denki Kabushiki Kaisha Interrupteur multipolaire
EP0292850A3 (en) * 1987-05-28 1990-10-10 Mitsubishi Denki Kabushiki Kaisha Multipole ciruit breaker
GB2282265A (en) * 1993-09-10 1995-03-29 Kloeckner Moeller Gmbh Switch with rotatable actuating shaft
GB2282265B (en) * 1993-09-10 1997-07-16 Kloeckner Moeller Gmbh Switch with rotatable actuating shaft
WO2000054297A1 (fr) * 1999-03-08 2000-09-14 Moeller Gmbh Disjoncteur multipole

Also Published As

Publication number Publication date
EP0002686B1 (fr) 1981-11-25
JPS5821375B2 (ja) 1983-04-28
DE2757696C2 (de) 1984-10-04
DE2757696B1 (de) 1978-11-02
JPS5496779A (en) 1979-07-31

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