EP1986208B1 - An electric switch - Google Patents

An electric switch Download PDF

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Publication number
EP1986208B1
EP1986208B1 EP07107036.1A EP07107036A EP1986208B1 EP 1986208 B1 EP1986208 B1 EP 1986208B1 EP 07107036 A EP07107036 A EP 07107036A EP 1986208 B1 EP1986208 B1 EP 1986208B1
Authority
EP
European Patent Office
Prior art keywords
shaft
switch
bridge element
housing
electric switch
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.)
Active
Application number
EP07107036.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1986208A1 (en
Inventor
Jan Domlin
Hans Johansson
Peder TJÄDERHANE
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.)
ABB AB
Original Assignee
ABB AB
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
Priority to DK07107036.1T priority Critical patent/DK1986208T3/da
Application filed by ABB AB filed Critical ABB AB
Priority to EP07107036.1A priority patent/EP1986208B1/en
Priority to PCT/EP2008/055108 priority patent/WO2008132183A1/en
Priority to RU2009141586/07A priority patent/RU2453944C2/ru
Priority to CNU2008900000071U priority patent/CN201294187Y/zh
Publication of EP1986208A1 publication Critical patent/EP1986208A1/en
Priority to HK09102961.2A priority patent/HK1124956A1/xx
Priority to NO20093417A priority patent/NO340350B1/no
Application granted granted Critical
Publication of EP1986208B1 publication Critical patent/EP1986208B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams
    • H01H19/626—Contacts actuated by radial cams actuating bridging contacts

Definitions

  • the present invention relates to an electric switch comprising: a housing; a shaft provided with at least one cam; at least two switch chambers, each of which is provided with at least one fixed electric contact element; at least two movable electric contact elements, one for each switch chamber; wherein the shaft is arranged so as to displace the movable contact elements through the action of the at least one cam upon rotation of the shaft.
  • the switch is preferably a so called side-operated enclosed switch. Typically, it is to be used in low voltage applications, preferably in the range of 16-40 Amperes. However, other ranges are also within the scope of the invention. Normally, the contact elements of different switch chambers are to conduct current of different phases.
  • Switches have been known since long time. They normally comprise a shaft by means of which a plurality of movable electric contact elements are acted upon for the purpose of connecting them to or disconnecting them from a corresponding plurality of fixed contact elements located inside a housing of the switch. Thereby, the shaft is manually controlled by means of a handle provided on the outside of the switch housing.
  • the main advantage of a side-operated switch compared to a front operated switch is that the housing, or enclosure, thereof can be opened without necessitating a removal of the handle.
  • the design of the components of switches of prior art are of kinds that will either complicate the assembly or result in rather complicated large sized complex movable elements.
  • the switch of the invention should be easy to open without removal of an external handle connected to the shaft thereof.
  • Components such as fixed electric contact elements (terminals) should also, in connection to the opening of the enclosure of the switch, be easily accessible and mountable.
  • the switch comprises a movable bridge element that is provided between the shaft and the movable electric contact elements and through which the action of the shaft is transmitted to the movable contact elements.
  • the bridge element will act as a seat for a plurality of movable electric contact elements each of which is associated to an individual switch chamber.
  • the housing comprises at least two parts that can be separated from each.
  • the fixed contact elements are fixed to the housing and arranged in such a position in relation to the movable elements that they will be connected to or disconnected from the latter as a result of a motion of the bridge element, in its turn caused by the rotation of the shaft and the resulting action of the cam or cams thereof. Also the fixed contact elements should be arranged such that they are easily accessible once the enclosure has been opened, in order to enable easy mounting thereof.
  • the shaft extends such that it passes at least one of, and preferably all of, said switch chambers, wherein two or more cams, one for each switch chamber, is provided in order to act on the bridge element.
  • the bridge element is common for all of a plurality of movable contact element, each such element being arranged in a respective pocket or seat in the bridge element.
  • An advantage of having double electric contact elements in each switch chamber is that it will permit a design that facilitates the assembly of the switch, since all part can be put in place from one and the same direction and need not be fixated until the switch is fully assembled.
  • the fixed contact elements associated to one and the same movable contact element are located such that the movable element will be connected to or disconnected from both those fixed contact elements simultaneously upon motion of the movable contact element.
  • the switch comprises sealing elements between the switch chambers.
  • the purpose of the sealing elements is to prevent ionized gas, generated in the switch during operation, from transferring electric arcs between the contact elements of different switch chambers, i.e. between different electric phases.
  • the sealing elements are arranged so as to prevent gas from passing from one switch chamber to another.
  • a total prevention is not required, but only to such a degree that said transfer of electric arcs will be sufficiently inhibited.
  • the sealing elements are arranged such that, regardless of the position of the bridge element, there will be no straight or wide channel between the switch chambers, but only narrow channels between adjacent sealing elements. Needless to say is, that the sealing elements be made of a dielectric material.
  • the sealing elements comprises a wall element provided on the bridge element.
  • the sealing elements comprise at least one wall element of the housing, said wall element of the housing being arranged so as to be in an overlapping position with regard to said wall element on the bridge element regardless of the position of the shaft.
  • the wall element of the housing may have the shape of a flange that overlaps the wall element of the bridge element, or, preferably, a recess into which the mating wall element provided on the bridge element projects.
  • the overlapping wall elements may extend either in a direction corresponding to the longitudinal direction of said shaft, in order to provide for lateral sealing, or in a direction cross-wise to the longitudinal direction of the shaft, in order to provide for a sealing in said longitudinal direction.
  • the wall element of the housing comprises a recess into which said wall element of the bridge element protrudes, wherein the wall element of the bridge element is permitted to perform a sliding motion in said recess.
  • the recess will have the function of a guiding member while simultaneously contributing to the sealing between switch chambers.
  • said wall element of the bridge element has an extension plane cross wise to the longitudinal direction of the shaft, and, on a side of the bridge where the at least one cam of the shaft will not move upon turning of the shaft between its activated and non-activated positions there is provided a lateral wall element of the bridge element, said lateral wall element being in an overlapping position with regard to an adjacent wall element of the housing regardless of the position of the bridge element.
  • This feature is particularly important when there will be generated a spacing between the shaft and the bridge element upon rotation of the shaft into the position in which it lifts the bridge element.
  • a position will correspond to the disconnection of the phases in the switch as a result of a lifting of the movable contact elements off from the fixed contact elements.
  • the lateral wall element will prevent an open passage between the switch chambers from upcoming due to such a lifting of the bridge element.
  • Such lateral wall elements may be provided on one or more sides of the bridge element.
  • the at least one cam forms part of the sealing elements.
  • the sealing elements comprise a wall element of the bridge element, said wall element being provided between and separating two adjacent switch chambers, and that the at least one cam of the shaft overlaps said wall element when acting on the bridge element.
  • the cam may also, or as an alternative this overlapping, overlap a wall element of the housing irrespectively of its position between the inactive and active positions thereof. This overlapping will be in a plane cross-wise or perpendicular to the longitudinal direction of the shaft.
  • the cams will also fill up a space or channel that otherwise, in the absence of the cam, would have been generated between the switch chambers and the shaft due to the lifting action of the cams.
  • the at least one cam overlaps said wall element (either of the bridge element or the housing) irrespectively of its position between its activated a deactivated positions.
  • the shaft is arranged so as to move between an activated position, in which the at least one cam lifts the bridge element, and a deactivated position, and, irrespectively of the position of the shaft between the activated and deactivated positions, the sealing elements will define a wall that fully separates two adjacent switch chambers as seen in the longitudinal direction of the shaft.
  • the sealing elements Preferably, there are also provided lateral sealing elements that provide for a lateral sealing.
  • such elements include the wall elements described earlier, as well as the cams.
  • the sealing elements comprise pairs of adjacent, overlapping surfaces of the bridge element and the housing and adjacent, overlapping surfaces of the bridge element and the at least one cam.
  • the housing comprises a first part which forms a seat for the shaft and the bridge element, and a second part which forms a top.
  • assembly of the switch will be facilitated.
  • the switch comprises a prestress element provided so as to act upon the shaft.
  • the objective of this pre-stressing of the shaft is to promote its rotation to either of an active or an inactive position of the cam or cams of the shaft.
  • the prestress element is a spring element provided on the side of the shaft opposite to the side thereof at which the bridge element is located.
  • the prestress element is located in the area of a switch chamber, and, preferably, the switch chamber in the area of which the prestress element is located is a switch chamber used for a neutral electric phase or for a auxiliary contact.
  • the switch comprises at least one ventilation opening extending from at least one switch chamber to the outside of the housing, wherein the distances between adjacent sealing elements between said at least one switch chamber and an open space between the bridge element and the shaft are adapted such that the pressure fall between said switch chamber and said open space is larger than the pressure fall between said switch chamber and the outside of the housing via said ventilation opening.
  • the sealing elements are arranged so as to guarantee that ionized gas is ventilated out through the ventilation opening rather than from one switch chamber to another through the open space between the shaft and the bridge element.
  • each switch chamber is provided with a ventilation opening.
  • Fig. 1 shows the main components of a switch according to the invention.
  • the switch comprises a housing generally indicated with 1 and comprising a first part 2 and a second part 3, a shaft 4, a bridge element 5, a plurality of fixed electric contact elements 6, means 7 for the fixation of the fixed contact elements, a plurality of movable electric contact elements 8, springs 9 for the biasing of the movable contact elements 8 towards the bridge element 5, and a prestress element 10 for stabilising the position of the shaft 4.
  • the switch will be enclosed in an enclosure (not shown), and preferably it also comprises lever or arm (not shown) that connects the shaft 4 to a handle or the like on the outside of such an enclosure.
  • the handle is supposed to be manually manoeuvred for the execution of electric connection and disconnection by means of the switch.
  • the switch is if a side-operated kind that allows opening of the enclosure and the housing 1 without necessitating any removal of the handle or the shaft 4.
  • switch chambers 11-13 there is provided two opposite fixed electric contact elements 6' and 6".
  • Each pair of contact elements 6', 6" represents one electric phase.
  • switch chambers 11-13 there are proved three switch chambers 11-13, one for each of the phases of an electric distribution net connected to the switch.
  • switch chambers 11-14 There is also provided a further, fourth switch chamber 14 that is used for a neutral electric phase or as an auxiliary switch chamber.
  • the switch chambers 11-14 are arranged in a series, and the shaft 4 extends in the direction of that series of chambers 11-14, such that it passes under each chamber 11-14.
  • the shaft is separated from the switch chambers 11-14 by a bottom part of the bridge element 5.
  • the bridge element 5 that contributes to the delimiting of the switch chambers 11-14 forms a seat for a plurality of movable electric contact elements 8, one for each switch chamber 11-14.
  • the bridge element 5 is arranged such as to be able to move, preferably by way of sliding, from a first inactive position of the switch in which the movable contact elements 8 are in contact with the fixed electric contact elements 6 to an active position in which the movable contact elements 8 are removed, and thereby electrically disconnected, from the fixed contact elements 6.
  • the bridge element 5 comprises a plurality of wall elements 15 that separate the switch chambers 11-14 from each other and that are arranged so as to slide in recesses 16 arranged in wall elements 17 of the surrounding housing 1.
  • the wall elements 15 of the bridge element 5 and the recesses 16 of the wall elements 17 of housing will overlap each other in such a way that a sealing function is obtained between the individual switch chambers 11-14.
  • the sealing function will help to prevent the upcoming of electric arcs between the individual switch chambers 11-14 due to the flow of ionized gases between individual switch chambers 11-14.
  • the shaft 4 comprises a plurality of cams 18, one for each switch chamber 11-14 and in alignment with each in the longitudinal direction of the shaft 4.
  • an inactive position shown in fig. 2
  • the cams 18 of the shaft 4 do not act upon the bridge element 5
  • the cams 15 will point in a lateral direction towards a first lateral wall 19 of the first part 2 of the housing 1.
  • an active position shown in figs. 3 and 4
  • the cams 18 will be pointing towards the bridge element 5, thereby lifting the latter and the movable contact elements 8 seated therein such that there will be an electric disconnection of the latter from the fixed contact elements 6.
  • an open space or channel 20 will appear between the shaft 4 and the bottom of the bridge element 5.
  • lateral openings are provided in the bridge element 5 between wall elements 15 that separate the switch chambers 11-14, the cams 18 being designed so as to protrude in the lateral direction through these openings in a first position, here the inactive position, and to obstruct or fill these openings, irrespectively of its position between the inactive and active positions.
  • the cams 18 of the shaft 4 will contribute to the sealing between the switch chambers 11-14.
  • one or more of the cams may be omitted from, whereby there should be provided a lateral wall element, preferably on the bridge element 5, for the purpose of preventing an open connection or channel from appearing between the open space 20 and the switch chambers 11-14.
  • lateral wall elements 21 are provided on the lateral side of the bridge element on which the cams 18 will not be present.
  • Corresponding lateral wall elements 22 are arranged in the housing, whereby the lateral wall elements 21 of the bridge element are to be in close and overlapping relation with regard to said lateral wall elements 22 of the housing 1 regardless of the position of the bridge element 5 between the active and inactive positions described earlier.
  • ventilation openings 30 extend from the switch chambers 11-14 to the outside of the housing 1.
  • the ventilation openings 30 extend through the top of the second, upper part 3 of the housing 1.
  • the dimensions of these ventilation openings are such that the pressure fall over each of them will be lower than the pressure fall from each corresponding switch chamber 11-14 to the open space 20 between the shaft 4 and the bridge element. Thereby, gathering of ionized gas in the open space 20 will be inhibited, and ionized gases generated in the switch chambers 11-14 during operation will tend to be ventilated via said ventilation openings 30.
  • the first part 2 of the housing 1 comprises a seat 23 for receiving the shaft 4.
  • the seat 23 comprises a plurality of arc-shaped rims arranged at the bottom of the first part 2 of the housing 1.
  • wall elements 24 that form part of the wall elements 17, in which the recesses 16 for guiding the wall elements 15 of the bridge element 5, project into and fill the spacing between individual cams 18, at least in the inactive position of the latter.
  • the above-mentioned lateral wall elements 22 are arranged, as well as the wall elements 17 in which the recesses 16 for the guiding of the wall elements 15 of the bridge element 5 are provided.
  • the second part 3 of the housing 1 mates the first part 2 thereof. also in said second part there are provided wall elements 17 in which the recesses 16 are arranged, in alignment with the corresponding wall elements and recesses in the first part 2.
  • the second part 3 of the housing 1 also comprises lateral wall elements 25 extending between the wall elements 17, thereby contributing to the delimitation of the switch chambers 11-14. It also comprise opposite end walls 26 and 27 extending cross wise to the longitudinal direction of the shaft 4 and forming the end limitation walls of the two outermost 11 and 14 of the switch chambers. Those end limitation walls could, as an alternative be formed by wall elements like the wall elements 15 of the bridge element 5.
  • the second part 3 of the housing 1 also comprises seats 28 for the biasing elements 9, formed by helical springs, that will act on the movable contact elements 8 in a direction towards the fixed contact elements 6. Accordingly, the seats 28 as well as the biasing elements 9 will be located in the switch chambers.
  • the switch also comprises a prestress element 10 formed by a leaf spring provided on the bottom of the first part 2 of the housing 1 and acting on the cam shaft 4 in a direction towards the bridge element 5.
  • a prestress element 10 formed by a leaf spring provided on the bottom of the first part 2 of the housing 1 and acting on the cam shaft 4 in a direction towards the bridge element 5.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Cookers (AREA)
  • Keying Circuit Devices (AREA)
  • Tumbler Switches (AREA)
EP07107036.1A 2007-04-26 2007-04-26 An electric switch Active EP1986208B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP07107036.1A EP1986208B1 (en) 2007-04-26 2007-04-26 An electric switch
DK07107036.1T DK1986208T3 (da) 2007-04-26 2007-04-26 Elektrisk kontakt
RU2009141586/07A RU2453944C2 (ru) 2007-04-26 2008-04-25 Электрический выключатель
CNU2008900000071U CN201294187Y (zh) 2007-04-26 2008-04-25 电开关
PCT/EP2008/055108 WO2008132183A1 (en) 2007-04-26 2008-04-25 An electric switch
HK09102961.2A HK1124956A1 (en) 2007-04-26 2009-03-27 An electric switch
NO20093417A NO340350B1 (no) 2007-04-26 2009-11-25 En elektrisk bryter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07107036.1A EP1986208B1 (en) 2007-04-26 2007-04-26 An electric switch

Publications (2)

Publication Number Publication Date
EP1986208A1 EP1986208A1 (en) 2008-10-29
EP1986208B1 true EP1986208B1 (en) 2013-10-09

Family

ID=38512220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07107036.1A Active EP1986208B1 (en) 2007-04-26 2007-04-26 An electric switch

Country Status (7)

Country Link
EP (1) EP1986208B1 (ru)
CN (1) CN201294187Y (ru)
DK (1) DK1986208T3 (ru)
HK (1) HK1124956A1 (ru)
NO (1) NO340350B1 (ru)
RU (1) RU2453944C2 (ru)
WO (1) WO2008132183A1 (ru)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018219224A1 (de) * 2018-11-12 2020-05-14 Eaton Intelligent Power Limited Schalter
GB2589107A (en) * 2019-09-05 2021-05-26 Eaton Intelligent Power Ltd Semi-independent switch-disconnector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1084811B (de) * 1958-10-01 1960-07-07 Continental Elektro Ind Ag Nockenschalter
DE3327675C3 (de) * 1983-07-30 1993-09-30 Kloeckner Moeller Gmbh Schaltkammer für Nockenschalter
SU1259355A1 (ru) * 1985-03-06 1986-09-23 Научно-Исследовательский,Проектно-Конструкторский И Технологический Институт Производственного Объединения "Уралэлектротяжмаш" Им.В.И.Ленина Выключатель высокого напр жени
ITMI20012586A1 (it) * 2001-12-10 2003-06-10 Abb Service Srl Polo elettrico per un interruttore di potenza di bassa tensione, e relativo interruttore
FR2886047B1 (fr) * 2005-05-18 2007-08-03 Tend Technology Co Ltd Commutateur modulaire a plusieurs etages

Also Published As

Publication number Publication date
NO20093417L (no) 2010-01-26
DK1986208T3 (da) 2014-01-20
RU2453944C2 (ru) 2012-06-20
WO2008132183A1 (en) 2008-11-06
NO340350B1 (no) 2017-04-10
RU2009141586A (ru) 2011-06-10
HK1124956A1 (en) 2009-07-24
EP1986208A1 (en) 2008-10-29
CN201294187Y (zh) 2009-08-19

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