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
  • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
  • H01H9/346—Details concerning the arc formation chamber
• • 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
  • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
  • H01H2009/348—Provisions for recirculation of arcing gasses to improve the arc extinguishing, e.g. move the arc quicker into the arcing chamber

Definitions

• the invention relates to a switch, in particular a self-switch, with the features of the introductory part of independent claim 1.
• the aim of the invention is to improve the discharge of the ionized gases to the deion plates in the arc quenching chamber. ser.
• the space lying between the plates and delimited by the contact strips is connected to the spaces lying between the outer sides of the plates and the inner sides of the walls of the housing adjacent to them through the openings lying according to the invention in the interior of the plates .
• the inventive design of the plates which delimit the space between the fixed contact piece and the movable contact in the OFF position, with at least one opening, allows gases produced in circuits, in particular in the case of short-circuit cutoffs, to flow back to the contact point by passing them through which step at least one opening in the plates and flow back between the plates and the housing walls to the contact point.
• the gas pressure in the region of the front of the arc which hinders the arc running, that is to say the movement of the arc to the deion sheets in the arc quenching chamber, is reduced.
• the openings in the invention are arranged within the plates. That the advantageous effect of the openings in the plates can be optimally combined with the actual function of the plates (protection of the housing). Furthermore, the position of the openings in the invention can be adapted to the conditions of the switch (for example the design of the contacts).
• the gassing effect that occurs when an arc is applied which is particularly strong in the case of plates made of synthetic material, the following further effect results from the at least one opening: in the area of at least one Opening in the plates, the gassing effect is smaller due to the reduced plate area than in the rest of the plate. This results in a relatively stronger gassing effect of the plates in the area lying at the contact point, so that the arc is additionally accelerated by the relatively increased gas pressure acting in the back of the arc.
• the at least one opening in the plates is provided in the region of a horn in the contact strip which carries the stationary contact piece.
• Fig. 1 shows schematically and in side view the part of a circuit breaker with a fixed contact piece, movable contact and a plate and
• Fig. 2 shows the area of Fig. 1 in section with the associated housing parts.
• the invention can be used with particular advantage in the case of any switch which is designed for higher currents, but in particular for circuit breakers such as circuit breakers which have to switch off in the event of a short circuit.
• the fixed contact piece is made by one Contact strips 1 worn, which is shaped into a horn 6 (U-shaped loop). Opposite the contact piece 5 and the horn 6 there is provided a conductor streak 3 which serves as a contact for the movable contact 2 when it is in the OFF position shown in FIG. 2.
• the space 8 between the contact strip 1 and the conductor strip 3 is delimited on both sides by plates 7.
• the plates 7 are arranged in the housing which accommodates the self-switch in such a way that a space 11 remains free between the inwardly facing surfaces 9 of the housing walls 10 and the outwardly facing surfaces 12 of the plates 7, as shown in FIG. 2 is shown.
• each of the two plates 7 there are openings 4, e.g. in the form of holes. At least one opening 4 is provided for each plate 7, the arrangement shown in FIG. 1 of three openings 4, for example in the corners of an equilateral triangle, on the side of the horn 6 of the contact strip 1 facing away from the contact piece 5 is particularly favorable and is therefore preferred according to the invention.
• the openings 4 in the plates 7 result in the following advantageous effect when the (short circuit) is switched off (lifting the movable contact 2 from the fixed contact 5): through the openings 4, the gases which are produced when the (short circuit) is switched off are one additional possibility for backflow to contact point 5 opens (this is symbolized in FIG. 2 by arrows).
• the gas pressure in the region of the arc end (front front of the arc) which inhibits the arc running (the dissipation of the (short-circuit) arc to the deion sheets of an arc quenching chamber, not shown) is additionally reduced.
• the surface of the plates 7 available in the horn 6 area for the gassing effect downsized because there is less material because of the openings 5.
• a switch has a stationary contact piece 5 which is fastened to a contact strip 1 fixed in the housing of the switch, a movable contact 2 which is pivotably mounted in the housing of the switch and a conductor strip 3 which acts as a stop for the movable contact 2 in its position serves.
• the space 8 between the contact strip 1 and the conductor strip 3 is delimited by plates 7 on both sides. In the plates 7 three openings 4 are provided, which lead out of the space 8 delimited by the contact strips 1, the conductor strip 3 and the plates 7 into the spaces 11 between the plates 7 and the associated walls 10 of the housing .
• Arc gases can escape through these openings 4 in the plates 7 and flow back to the contact point, so that the movement of the arc gases to an arc quenching chamber is supported. Furthermore, because of the area of the plates 7 which is reduced in areas through the openings 4, a gas pressure difference between the front and the back of the arc which supports the movement of the arc gases to the arc quenching chamber is formed.

Landscapes

• Arc-Extinguishing Devices That Are Switches (AREA)
• Switches With Compound Operations (AREA)
• Lock And Its Accessories (AREA)
• Push-Button Switches (AREA)
• Breakers (AREA)
• Percussive Tools And Related Accessories (AREA)
• Valve Device For Special Equipments (AREA)
• Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
• Oscillators With Electromechanical Resonators (AREA)
• Electronic Switches (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3529840

Family Applications (1)

Country Status (11)

Cited By (3)

Families Citing this family (1)

Citations (5)

• 1993
  • 1993-11-02 AT AT0219993A patent/AT410725B/de not_active IP Right Cessation
• 1994
  • 1994-08-22 AU AU73771/94A patent/AU676934B2/en not_active Expired
  • 1994-08-22 AT AT94923585T patent/ATE156298T1/de active
  • 1994-08-22 DK DK94923585.7T patent/DK0727088T3/da active
  • 1994-08-22 WO PCT/AT1994/000117 patent/WO1995012888A1/de not_active Ceased
  • 1994-08-22 EP EP94923585A patent/EP0727088B1/de not_active Expired - Lifetime
  • 1994-08-22 ES ES94923585T patent/ES2106556T3/es not_active Expired - Lifetime
  • 1994-08-22 HU HU9601165A patent/HU215890B/hu not_active IP Right Cessation
  • 1994-08-22 PL PL94314227A patent/PL174603B1/pl unknown
  • 1994-08-22 DE DE59403580T patent/DE59403580D1/de not_active Expired - Lifetime
  • 1994-08-22 CZ CZ961279A patent/CZ285082B6/cs not_active IP Right Cessation
• 1996
  • 1996-05-02 NO NO961789A patent/NO307907B1/no not_active IP Right Cessation

Patent Citations (5)

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