Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/12—Automatic release mechanisms with or without manual release
  • H01H71/24—Electromagnetic mechanisms
  • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
• • 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

Definitions

• the invention relates to an installation switching device with a double break according to the preamble of claim 1.
• Generic installation switching devices such as motor protection switch, have at least one Polstrompfad, comprising two fixed contacts and two arranged on a movable contact bridge, movable contact pieces through which a pole switch with two contacts and double interruption is formed.
• the contact bridge is acted upon by a pusher in the opening direction and by a contact pressure spring in the closing direction.
• generic installation switching devices include an electromagnetic release whose armature strikes the contact bridge in the opening direction when a short-circuit current occurs in the pole current path via the pusher as well as unlatches the latching point of a switching mechanism, so that the switching mechanism via a knuckle the contact bridge permanently against the contact pressure spring acted upon opening.
• the active lever Due to the greater inertia of the mechanical system formed from the switching mechanism and the active lever, compared with the lower inertia of the armature and the pusher comprehensive mechanical system, the active lever for permanent keeping open of the contacts through the switch lock the pusher movement after. Because after unlatching the switching mechanism, it takes a certain time until the active lever is acted upon by the switching mechanism in the opening direction, and then again takes a certain time until the active lever called the tripping path between its rest position and its point of attack on the pusher. has returned. For design reasons, a certain trip path of the action lever is unavoidable, since the pusher and the active lever at rest require a certain amount of play.
• the invention takes the pusher on a driving part when opening the contact bridge the active lever in the direction of its point of attack on the pusher with, so that the tripping of the action lever is shortened. If it is then acted upon in the opening direction after unlatching of the switching mechanism of the active lever, it is already close to its point of application to the - then back again by the force of the contact pressure spring in the closing direction moving back - pusher. This allows him to act after unlatching of the switching mechanism with a very small time delay at its point of attack on the pusher and hold it permanently in the open position, before the contact bridge is moved by the restoring force of the contact pressure spring in the closing direction in its closed position, thereby closing the contacts prematurely would. Contact bouncing can be prevented.
• the driving part cooperates with the free, the pusher at the point acting on the end of the action lever together.
• the pusher have a first, a lower stop for the free end of the action lever forming paragraph. The point of action of the action lever on the pusher is then at this first paragraph.
• the pusher may have a second, an upper stop for the free end of the action lever forming paragraph.
• the pusher through the anchor is beaten in the opening direction, he can then take with the upper stop the free end of the action lever in the direction of the first paragraph out.
• the second paragraph is formed as a bead-like molding on the free, acted upon by the anchor end of the pusher.
• this advantageous embodiment can be characterized in that the pusher is formed in the region between the first and the second paragraph in the form of an approximately cylindrical tube or a cylindrical bolt with a smaller diameter than the rest of the pusher.
• the active lever at its free, the pusher acting end having a driving part corresponding with the coupling part.
• This coupling part can be a loop-like surrounding the pusher, U-shaped recess at the free end of the action lever.
• the recess may at least partially surround the pusher in the area between the first and the second shoulder, so that the range of motion of the action lever is limited to this distance.
• FIG. 1 shows a functional diagram of a service switching device according to the invention with a pusher according to the invention in the rest position
• FIG. 2 shows a sectional view of the pusher according to the invention according to FIG. 1,
• FIG. 3 shows a functional diagram of a service switching device according to the invention shortly after the occurrence of a short-circuit current
• FIG. 4 shows a functional diagram of a service switching device according to the invention with maximum deflection of the contact bridge in the opening direction;
• Figure 5 is a functional diagram of a service switching device according to the invention in case of declining movement of the contact bridge in the direction of its closed position
• Figure 6 is a functional diagram of a service switching device according to the invention in permanent opening through the switch lock on the active lever.
• FIGS. 1 to 6 identical or equivalent elements or assemblies are designated by the same reference numerals.
• FIG. 1 shows an inventive installation switching device 1 with a Polstrompfad 2 between an input terminal 3 and an output terminal 4. It could for example be a Polstrompfad a three-pole motor protection switch, the other two Polstrompfade are constructed accordingly.
• the pole current path 2 comprises two stationary contact pieces 5, 6 and two movable contact pieces 8, 9 arranged on a movable contact bridge 7, through which a contact point 10 with double interruption is formed.
• the contact bridge 7 is acted upon by a contact pressure spring 11 in the closing direction, see directional arrow S.
• a pusher 12 which acts on the opposite side of the contact pressure spring 11 of the contact bridge 7, this can in the opening direction, see direction arrow O, are applied.
• the Polstrompfad 2 still includes a thermal release 113 and an electromagnetic release 13 with an armature that hits the contact bridge 7 in the opening direction in the event of a short circuit current occurring in the Polstrompfad 2 due to an electrodynamic recoil over the pusher 12, indicated by the action line 14.
• the armature of the electromagnetic release 13 also acts on a switching mechanism 15 and unlocks its latching point, indicated by the action line 16, so that the latching mechanism 15 in the unlatched state via an active lever -17, indicated by the action line 18, the pusher 12 permanently in Opening direction of the contact bridge 7 acted upon.
• thermal release 113 which also acts in the case of an overcurrent on the switching mechanism 15, indicated by the action line 114, is known in principle and not the subject of the present invention.
• the thermal release 113 is shown here only for the sake of completeness.
• the mechanical system comprising the switching mechanism 15 and the active lever 17 may, for example, be a toggle lever system with a two-stage locking mechanism. kung act.
• the active lever 17 is designed as a double-arm lever, the first, acted upon by the switching mechanism 15 lever arm 171 and the second, cooperating with the pusher 12 lever arm 172 form an obtuse angle with each other and is rotatably mounted in a stationary axis of rotation 173, whereby the Wirkhe- at 17 acts as a lever.
• the mechanical system just described has a certain mechanical inertia, which, if no further measures are taken, would take a certain time, for example 2 to 5 ms, after release, before the active lever 17 engages with the free end of its second arm 172 meets the pusher 12 to apply this permanently in the opening direction.
• the time to direct strike of the contact bridge 7 by the armature of the electromagnetic release 13 is much shorter, it is for example only 1 ms.
• the pusher 12 is a total of a longitudinally extending components with approximately a cylindrical or cuboidal basic shape. It comprises two parts fixedly connected to one another, a slide 19 and a striking pin 20 firmly molded onto this slide 19.
• a slot-like opening 21 in the slide 19, which points downwards towards the narrow side of the slide 19 through a web 25 can be closed, the contact bridge 7 is guided in its closing - or displaceable in its opening direction.
• the active lever 17 carries at the free end of its second lever arm 172 a U-shaped recess 174 which surrounds the striker pin 20 of the pusher 12 in an eyelet-like manner. About the U-shaped recess 174 thus the active lever 17 is articulated movably on the pusher 12.
• the pusher 12 has a first, a lower stop for the free end 174 second lever arm 172 of the action lever 17 forming paragraph 24.
• the pusher At the free end of the striker pin 20, the pusher on a second, an upper stop for the free end 174 of the second lever arm 172 of the action lever 17 forming guide shoulder 28.
• the guide shoulder 28 is designed here as an edge on a attached to the free end of the striker pin 20 driving part 29.
• the driving part 29 here is a bead-like molding on the free end of the striker pin 20. It could also be a molded plate or a similar construction element.
• the effect of this arrangement according to the invention is the following. For in the Polstrompfad 2 a short circuit occurs, see Figure 3, the anchor of the electromagnetic release 13 strikes the guide shoulder 28, indicated by the force arrow I in conjunction with the action line 14. By this impulse the pusher 12 is struck in its opening direction O.
• Switching mechanism exerts a force F on the first lever arm 171 of the action lever 17 via a mechanical device known per se, as a result of which it remains rotated in the clockwise direction relative to its starting position.
• the U-shaped recess shown in the embodiment at the free end of the second lever arm 172 in cooperation with the pin-shaped configuration the pusher 12 in the area of the striker pin 20 is only one of many conceivable ways of realizing the function according to the invention of taking the action lever 17 in the direction of its point of application 24 on the pusher 12.
• the free end of the second lever arm 172 of the active lever 17 may be bar-shaped and extend in a longitudinal direction of the pusher 12 at a corresponding position attached slot between an upper and a lower stop position.
• the slide can be made in one piece with the striker 20 or the aforementioned slot as an injection molded part. But it could also consist of two parts, in the simplest case of a lower part and a screwed into this lower part cap screw, which then acts as a striking pin with guide paragraph.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Lock And Its Accessories (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=38984498

Family Applications (1)

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Family Cites Families (2)

• 2006
  • 2006-11-22 DE DE102006054984A patent/DE102006054984A1/de not_active Withdrawn
• 2007
  • 2007-11-08 WO PCT/EP2007/009671 patent/WO2008061631A1/fr active Application Filing
  • 2007-11-08 EP EP07819681A patent/EP2095388B1/fr not_active Not-in-force
  • 2007-11-08 AT AT07819681T patent/ATE504934T1/de active
  • 2007-11-08 DE DE502007006902T patent/DE502007006902D1/de active Active

Non-Patent Citations (1)

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