US1503091A - Magnetic blow-out device - Google Patents

Magnetic blow-out device Download PDF

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Publication number
US1503091A
US1503091A US421212A US42121220A US1503091A US 1503091 A US1503091 A US 1503091A US 421212 A US421212 A US 421212A US 42121220 A US42121220 A US 42121220A US 1503091 A US1503091 A US 1503091A
Authority
US
United States
Prior art keywords
switch
magnetic
contacts
flux
blow
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.)
Expired - Lifetime
Application number
US421212A
Other languages
English (en)
Inventor
Eugene R Carichoff
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US421212A priority Critical patent/US1503091A/en
Priority to GB10702/21A priority patent/GB182923A/en
Priority to FR547005D priority patent/FR547005A/fr
Priority to FR25602D priority patent/FR25602E/fr
Priority to DEI22124D priority patent/DE379608C/de
Application granted granted Critical
Publication of US1503091A publication Critical patent/US1503091A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil

Definitions

  • My invention relates to improvements in electromagnetic switches, and in particular to magnetic blow-out devices for disrupting the arcs formed between the switch contacts.
  • the customary magnetic blow-out device is provided with a blow-out coil which is in series with the switch contacts or one which is included in the circuit of the are after the contacts separate.
  • One of the objects of my invention is to eliminate this separate blow-out coil, thereby simplifying the 2 switch construction and also reducing the cost of manufacture.
  • My invention has a particular application in electromagnetic switches provided with an operating or controlling magnetic structure through which a magnetic flux passes during the opening of the switch and also after the switch contacts have opened. In carrying my invention into effect, I connect my blow-out device across the points on the magnetic structure of the switch between which there is a difference of magnetic potential.
  • a particular application of my invention is found in electromagnetic switches of the series lock-out type which are provided with a magnetic structure which is energized during the opening of the switch and also after the switch has opened.
  • Such switches are customarily provided with two air gaps in the magnetic circuit, one a closing gap and the other a holding-out gap, and in carrying my invention into” effect in a switch of this character I connect two magnetic members to the magnetic structure so as to provide a shunt path for the magnetic flux around the closing gap, the flux through this shunt path passing across the space in which the contacts separate so as to disrupt any arcs formed between the contacts.
  • Fig. 1 shows a side view of a series coil electromagnetic switch of the lockout type having 2, 1920. Serial N0. 421,212.
  • the switch mechanism is mounted on a base 10 of slate or other suitable insulating material, and the movable switch member 11 in the form of a bell crank lever is pivoted at 12 to the member 13 which is a part of the magnetic structure of the switch.
  • the wiping contact.finger 14 is pivotally mounted on the bell crank switch member 11 at 15, and a spring 16 is provided for the purpose of resiliently mounting the contact 14- so that the contact 14 will make a wiping engagement with the stationary contact 17 in closing, and when the contactor is closed there will be a spring pressure between the contacts.
  • the bell crank 11 is pivotally connected at 18 to a plunger 19 which constitutes the movable member of the magnetic structure of the switch. This plunger 19 is constructed substantially as shown in Fig.
  • a sleeve 21 of brass or other non-magnetic material surrounds the lower end 20 of reduced cross-section for the purpose of preventing the plunger from sticking to the adjustable sleeve 22 of magnetic material which surrounds the end 20 and the sleeve 21.
  • This adjustable sleeve 22 is prefcrabl in the form of a hollow cylindrical externa ly threaded screw, and the slceveis provided with a knurled head 23, by means of which the sleeve may be adjusted in position with respect to the plunger 19 and the lower supporting member 24 of magnetic material.
  • a closing air gap 25 is provided between the upper and enlarged end of the plunger 19 andthe upper member 26 of the support if the switch windings are deener gized, or if the series winding 31 which surrounds a portion of the plunger 19 and completely surrounds the holding-open gap 27 is energized above the calibrating point, or in case the direction of current in the series winding 31 is reversed with respect to the shunt winding 32.
  • T o the right of the series coil 31 and located between the members 24 and 26 of magnetic material is the shunt control coil 32.
  • This shunt control coil is mounted on a core 33 of magnetic material and is clamped between the'members 2t and 26 by means of the bolt 34.
  • the magnetic structure of the operatincr electromagnet of this switch is energized at all times while the switch is in operation, and I make use of the magnetic flux of this operating magnet to extinguish the arcs formed between switch contacts 14 and 17 when the switch is opened.
  • the closing gap 25 is closed when the switch is closed, but there is a drop of magnetic potential across this gap at all times while the switch is opening and when'theswitch. is opened because of the flux set. up by the shunt coil 32.
  • the plates and 36 of magnetic material Connected to .the upper ends of the strips 37 and 38 are the plates and 36 of magnetic material which are disposed parallel to the plane of movement of the switch contacts, and which are adapted to support the arc chute 39 of refractory material in such a position that the arcs formed between the switch contacts will be caused to proceed upwardly from the contacts through the arc chute.
  • my invention is as fol-- plunger 19 will be magnetically saturated and an increased flux "will cross the holding-out gap 27 and exert a force which will oppose the pull exerted by the flux across the closing gap 25 to such an extent that the switch will remain in the open position. In case the current drops.
  • the switch will be closed by reason of the fact that the pull at the closing gap 25 predominates.
  • the shunt winding 32 is energized at all times while the switch is in operation to set up a flux in the magnetic structure which has no tendency to hold the switclnopen, but which nevertheless exerts a force which will close the switch in case the current in the series coil 31 is at any value less than the previously mentioned predetermined value. This value is ordinarilytermed the calibrating value or lock-out value.
  • the switch will automatically open at a certain value of the reverse current. This is due to the fact that the flux set up by the shunt coil 32 is opposing the flux set up by the series coil 31, and for the further reason that the series coil is setting up a pronounced force across the holding-open gap 27. The switch will therefore automatically open, and while it is opening there will be adrop of magnetic potential across the closing gap 25.
  • the magnetic blow-out device By reason of the fact that the magnetic blow-out device is arranged in shunt to this closing gap, the magnetic flux set up by the shunt coil will be caused to proceed through a path comprising the strip 37, across the switch contacts 14 and 17 at right angles to their plane of movement. and through the strip 38.
  • This flux which is eli'ective as a magnetic blow-out, will be effective even after the switch is open, and the arcs formed between the switch contacts are quickly disrupted and forced to proceed upwardly from the switch contacts through the arc Chute 39.
  • An electromagnetic switch comprising an operating electromagnet having a magnetic structure with an air gap across which there is a difference of magnetic potential while the switch is opening, a pair of rela tively movable switch contacts, and a pair of magnetic members each of which has one end connected to the magnetic structure and the other end disposed adjacent the switch contacts, forming a path for the magnetic flux of the magnetic structure shunting the said air gap through which opened, a, pair of switch contacts operated by the said electromagnet to and from the closed position, and a magnetic blowout device adjacent the said contacts shunting the said gap. in the magnetic structure.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Electromagnets (AREA)
US421212A 1920-11-02 1920-11-02 Magnetic blow-out device Expired - Lifetime US1503091A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US421212A US1503091A (en) 1920-11-02 1920-11-02 Magnetic blow-out device
GB10702/21A GB182923A (en) 1920-11-02 1921-04-12 Improvements in and relating to electro magnetic switches
FR547005D FR547005A (fr) 1920-11-02 1921-10-29 Perfectionnements apportés aux contacteurs électromagnétiques
FR25602D FR25602E (fr) 1920-11-02 1921-10-29 Perfectionnements apportés aux contacteurs électromagnétiques
DEI22124D DE379608C (de) 1920-11-02 1921-11-02 Elektromagnetischer Schalter mit magnetischer Ausblasevorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US421212A US1503091A (en) 1920-11-02 1920-11-02 Magnetic blow-out device

Publications (1)

Publication Number Publication Date
US1503091A true US1503091A (en) 1924-07-29

Family

ID=26247702

Family Applications (1)

Application Number Title Priority Date Filing Date
US421212A Expired - Lifetime US1503091A (en) 1920-11-02 1920-11-02 Magnetic blow-out device

Country Status (4)

Country Link
US (1) US1503091A (fr)
DE (1) DE379608C (fr)
FR (2) FR547005A (fr)
GB (1) GB182923A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970196A (en) * 1957-01-22 1961-01-31 Westinghouse Electric Corp Circuit interrupters

Also Published As

Publication number Publication date
DE379608C (de) 1923-08-24
FR25602E (fr) 1923-04-21
FR547005A (fr) 1922-11-29
GB182923A (en) 1922-07-12

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