EP2502250A1

EP2502250A1 - Electric installation switching device

Info

Publication number: EP2502250A1
Application number: EP10778567A
Authority: EP
Inventors: Ralf Weber
Original assignee: ABB AG Germany
Current assignee: ABB AG Germany
Priority date: 2009-11-16
Filing date: 2010-11-09
Publication date: 2012-09-26
Also published as: WO2011057753A1; DE102009053012A1; CN201732747U

Abstract

The invention relates to an electric installation switching device (10), in particular a circuit breaker, comprising a magnetic trigger (73) and/or a thermal trigger (75), a switching lock with a latching point (49, 45), and a switching toggle (19) for manually actuating the switching lock. The switching toggle is mounted on an axis (20) and is connected to an end of an intermediate lever (33) by means of a coupling element (27), the other end of said intermediate lever being coupled to a contact lever (62) that supports the movable contact piece (68). The switching toggle (19) is a two-arm lever with a switching handle (18) and at least one protrusion (21). A through-opening (24) is provided in the protrusion (21), a limb of the coupling element (27) being inserted into said through-opening. The through-opening (24) is designed as an elongated hole, the longitudinal axis (241) of which forms an angle (α) of less than 45° with the longitudinal center axis (181) of the switching handle (18), said longitudinal center axis running through the axis (20).

Description

Electrical service switching device

description

The invention relates to an electrical installation switching device, in particular a circuit breaker, with a magnetic release and / or with a thermal trigger see, with a switch lock with a Verklinkungsstelle, with a mounted in an axis switch knob for manual operation of the switch latch, wherein the switch knob by means of a Coupling element is connected to one end of an intermediate lever, wherein the other end of the intermediate lever is coupled to a movable contact piece carrying the contact lever, wherein the switch knob is a Doppelarmhebel with a handle and at least one projection, and wherein in the projection a through hole is introduced, in the one leg of the coupling element is inserted, according to the preamble of claim 1.

A generic service switching device usually has a contact point formed by a fixed and a movable contact piece, wherein the movable contact piece is held on a pivotally mounted contact lever. Furthermore, a generic installation switching device comprises a magnetic trigger with magnetic armature and a thermal release, as well as a releasable from the thermal and the magnetic release switch lock with a Verklinkungsstelle. This is formed by a release lever and a stationary rotatably mounted, a slot for guiding a bracket having latch lever. In the event of a short circuit, the magnet armature can act on the opening of the contact point bearing on the movable contact piece contact lever and the switch lock can hold the contact lever permanently in the open position. Next, a generic installation switching device comprises a switch knob for manual operation of the switching mechanism, and an intermediate lever which is hinged at its one end to the contact lever and with its other end to the bracket, wherein the bracket is articulated with at least one leg on the switch knob.

CONFIRM 10N COPY The contact lever is acted upon in generic service switching devices by the force of a contact pressure spring, which is so directed to the contact lever that it presses in the closed position, the movable contact piece against the fixed contact piece, and pushes in the off position, the movable contact piece of the fixed contact piece.

The intermediate lever is the link between the rear derailleur and the contact lever.

Such a service switching device is shown, for example, in DE 10 2008 006 863 A1 and in DE 10 2005 041 231 A1. With regard to the functional internal structure, in particular with regard to the unlatching, the reconnection by actuation of the switch knob and the design of the contact opening, DE 10 2008 006 863 A1 and DE 10 2005 041 231 A1 should therefore be explicitly included in the disclosure of the present invention.

In the known derailleurs, the contact opening, i.e. the angle at which the contact lever can rotate away from the fixed contact at the contact opening, is limited. About the action chain contact lever - intermediate lever with ratchet lever - bracket - switch knob, the opening movement of the contact lever is coupled with the movement of the ratchet lever. At a large contact opening, so if the contact lever is far in the open position pivots, the contact lever can push the latch lever too far down, away from the trigger. Then, when you turn the latch lever may not meet the latch surface on the release lever, so that it does not come to a proper latching, whereby the closing of the contact point and thus the reconnection is prevented.

It is therefore an object of the present invention to provide a generic service switching device, in which a larger contact opening can be achieved, and in which nevertheless a secure Wiederverklinken the Verklinkungs- point is ensured.

The object is achieved by a generic service switching device with the characterizing features of claim 1. Thus, according to the invention, the passage opening is formed as an oblong hole whose longitudinal axis forms an angle α of less than 45 ° with the longitudinal central axis of the control handle extending through the axis. As a result, the advantageous effect is achieved that the bracket can continue to run at a very large contact opening in the slot. He can then effectively dodge into the slot, and thereby it is avoided that the movement of the bracket is deflected in a downward, away from the trigger lever force action on the ratchet lever. As a result, a larger contact opening is possible without the ratchet lever is removed too far from the release lever, so that a secure Wiederverklinkung remains possible. The angle between the longitudinal axis of the oblong hole and the central longitudinal axis of the control handle has the advantage that when the switching knob is switched back on, the clip snaps upwards despite the oblong hole and the latching lug of the pawl lever immediately rests against the corresponding latch surface of the trigger lever. This avoids the occurrence of a mechanical play or an overstroke when switching on again.

According to an advantageous embodiment of the invention, the angle α is between 5 ° and 20 °. According to a further advantageous embodiment of the invention, the angle α is between 10 ° and 13 °.

A further advantageous embodiment of an electrical installation switchgear according to the invention is characterized in that the switching knob has diametrically opposite the handle two fork-shaped projections which leave a one-sided open receiving space between them, wherein in each of the two projections a passage opening in the form of an elongated hole is formed ,

In a further advantageous embodiment of the invention, the coupling element is a U-shaped bracket with a U-leg connecting the strap web.

Further advantageous embodiments and improvements of the invention and further advantages can be taken from the subclaims.

Reference to the drawings, in which an embodiment of the invention is shown, the invention and further advantageous embodiments and improvements of the invention will be explained and described in more detail. Show it:

Figure 1 is an insight into an inventive installation switching device, with open contact point;

Figure 2 is a view of a switch knob according to the invention, and Figure 3 is an insight into an inventive installation switching device, with closed contact point.

In the figures, identical or equivalent components or elements are designated by the same reference numerals. Figures 1 and 3 show the rear derailleur in the off, or in the latched state. The elongated hole according to the invention in the projection of the switch knob can not be clearly seen in this illustration, since it is concealed by other components. In Fig. 2, the switch knob is shown separately, with emphasis on the slot.

An installation switching device, here a circuit breaker, which is designated in its entirety by the reference numeral 10, has a housing, which is composed of two housing half-shells, of which only the first housing half-shell 1 is partially shown. This housing half shell 11 has like the supplementary, not shown, the second housing half shell a front front wall 12 and two rear front walls, of which in Figure 1, only a rear front wall 13 can be seen, of which in the figure, only one front side wall 14 can be seen connected to each other. Further belonging to the housing rear narrow side walls, and a mounting side and broad sides of the housing can not be seen in the illustration of Figure 1.

Of course, it is also possible to use only a housing half shell, which is closed by means of a lid. In the case when two housing half shells are provided, each housing half shell has a width which corresponds to half the standard module width. In the case when a single housing half shell is closed by means of a lid, the housing half shell has a corresponding dimension, which is selected so that it reaches the module width together with the lid. In the front front wall 12 there is an opening 17 through which the control handle 18 of a control knob 19 protrudes. The switching knob 19 has an opening 201 (see FIG. 2), which can be regarded as a virtual axis of rotation of the switch knob, and through which it is mounted on a housing-fixed axis 20. On the switching handle 18 diametrically opposite side are two fork-shaped projections 21, 22 (see also Fig. 2), of which in the illustration of Figure 1, only one projection 21 is visible. The two projections 21, 22 leave between a one-sided open receiving space 23 free. Each of the two projections 21, 22 has at its end facing away from the handle 18 a slot-like opening 24, 25. The longitudinal center axis 181 of the handle 18 passes through the center of the opening 201. The slot-like opening 24, 25 has a longitudinal axis 241. This forms with the longitudinal center axis 181 of the control handle 18 an angle α of less than 45 °, here an angle approximately in the range between 10 ° and 15 °.

In the slot-like opening 24 engages a leg of a U-shaped bracket 27 with its molded guide extension. The second leg of the bracket 27 is not visible in Figures 1 and 3, it is approximately parallel to the first visible leg, hidden by the intermediate lever 33. In DE 10 2008 006 863 A1, the shape of the bracket 27 is described in more detail, In this respect, reference is made here to DE 10 2008 006 863 A1. With its guide extension of the second leg of the bracket 27 engages in the slot-like opening 25 of the second projection 22 of the switch knob 19 a.

The connecting the two U-legs strap web 30 of the bracket 27 engages in two latching openings 31 of an intermediate lever 33 a. The intermediate lever 33 has at its one end a projecting into two fork-shaped projections U-profile, each of the two fork-shaped projections each terminal has a latching opening 31.

At the same time, the bar web 30 engages in a slot of a below the intermediate lever 33 and arranged partially in the U-profile - recess between the two terminal projections of the intermediate lever 33 extending latch lever 37 and through it. Thus, the U-shaped bracket 27 is guided with its strap web 30 in the slot of the ratchet lever 37, and at the same time is the intermediate lever 33 hinged with its latching openings 31 on the strap web 30. The switch knob 19, the intermediate lever 33 and the latch lever 37 thus form a coupled together by the bracket 27 assembly.

On the pawl lever 37, a pin 38 are integrally formed on each side, with which it is fixed and rotatably mounted in a two-shell housing in two housing halves or in a single-shell housing with a lid in the housing shell and the lid.

The longitudinal direction of the intermediate lever 33, the pawl lever 37 and the legs of the bracket 27 extend approximately parallel to the broad side of the device housing. To the fixed axis 20, which coincides with the axis of rotation of the switch knob 19, a release lever 40 is rotatably mounted. This is designed approximately L-shaped, with its first arm having at its free end a joint head with a loop-shaped opening with which it is rotatably mounted on the stationary shaft 20. Its second arm 43 (see Fig. 3) is formed approximately at right angles to the first arm. The first arm has approximately in its middle a locking surface 44.

At the annular end face of the eye-shaped opening, the first arm of the release lever 40 carries a latching lug. The release lever 40 is inserted with its first arm in the receiving space 23 between the two fork-shaped projections 21, 22 of the switch knob 19 so that the central axis of its eye-shaped opening coincides with the central axis of the opening of the switch knob 19. The opening of the switch knob sits on a bead surrounding the eye-shaped opening on which it is rotatably supported. The release lever 40 is pivotally supported on the axis 20, and the switch knob 19 is pivotally supported on the release lever 40.

The latch lever 37 carries at its one free end a nose 49 which forms the Verklinkungsstelle of the switch lock together with the locking surface 44 on the release lever 40 in the Verklinkungsstellung of the release lever 40. In the figure 3, the circuit breaker 10 is shown with latched rear derailleur. In the Verklinkungsstellung the release lever 40 is pivoted clockwise in the view of Figure 3 to the pawl lever 37 out. The intermediate lever 33 has at its end remote from the bracket 27 a recess 60. At this recess, it is connected by means of a cylindrical pin 61 hinged to the contact lever 62.

The contact lever 62 is designed as a double-arm lever and rotatably mounted in a slot 66 on a fixedly connected to the first housing half-shell 11 axis 63, so that a first part lever 64 from the stationary axis 63 in the direction of the front front wall 12 points out, and a second Part lever 65 points from the stationary axis 63 in the direction of the attachment side of the housing. At the free end of the first partial lever 64 this carries the positively connected with him pin 61. The pin 61 thus forms the coupling point between the link chain 50 and the contact lever 62nd

The first part lever 64 has a U-shaped contour with a receiving space 67 formed by the leg extending approximately parallel to the broad sides of the housing, which opens in the direction of the front side wall 14, and whose one leg has a recess, so that the receiving space 67 is accessible from the broad side of the removed housing half shell with the housing open.

The second part lever 65 carries at its free end the movable contact piece 68th

Now consider Figure 3. Here the circuit breaker is shown in the closed position. The switching handle 18 is in the closed position, the nose 49 on the pawl lever 37 is latched to the locking surface 44 on the trigger lever 40. As a result, the intermediate lever is blocked and the pin 61 at the coupling point between the link chain 50 and the contact lever 62 now forms the axis of rotation for the contact lever 62. About this axis 61, the contact pressure spring 69 presses the contact lever 62 counterclockwise, thus providing the contact between the movable contact piece 68 and the fixed contact piece 70 safely.

It can also be seen the coil 72 of the magnetic release 73 and a strip 74 of bimetallic or a shape memory alloy as part of the thermal release 75. In the arrangement as shown in Figures 1 and 3, there is the contact lever 62 and from the movable and the fixed contact piece 68,70 formed contact point between the magnetic release 73 and the thermal release 75. In other words, the magnetic release 73 and the thermal release 75th lie with respect to a running through the contact lever 62, imaginary plane which is perpendicular to the first housing half shell 11, on different sides.

When triggered, the magnetic release 73 or the thermal release 75 to open the latch 49 formed by the nose 49 on the pawl lever 37 and the locking surface 44 on the release lever, so that the switching mechanism is thereby unlatched and the contact lever 62 by the contact pressure spring 69 in the in the figure 1 shown switch off position can go over. For this it is necessary that the magnetic release and the thermal release are mechanically coupled to the release lever 40. In the embodiment of the present invention, as shown in Figures 1 and 3, the mechanical coupling between the magnetic release 73 and the thermal release 75 with the release lever 40 via a stationary rotatably mounted hammer 77 occurs.

For this purpose, at a further fixedly connected to the housing half shell 11 axis 76 designed as a double arm lever whip lever 77 is pivotally mounted.

A first partial arm 78 of the striking lever 77 points from the stationary axis 76 in the direction of the attachment side of the housing. He has an eye-shaped opening

79, in which a first leg of a transfer bracket 80 is movably held.

The second leg of the transfer bracket 80 is guided displaceably in a guide groove 81 of the housing. The side walls 82 of the guide groove 81 are designed so deep, and the second leg of the transfer bracket 80 is carried out correspondingly so long, that of the strip 74 of the thermal release 75, when it bends when heated in the direction of arrow R, ie here counterclockwise , the side walls 82 of the guide groove 81 can drive over and thereby the transmission bracket

80 pulls on the second leg in the direction of arrow R.

By the train, the transmission bracket 80 pivots the hammer 77 in a clockwise direction, and this acts with its second arm 83 on the release lever 40, that it pivots counterclockwise, so that the locking surface 44 is away from the nose 49 and thus the latch is unlatched.

The same happens with the magnetic release. In the case of a short-circuit current occurs at an opening on the front of the hammer 77 side of the magnetic release 73 a driven by the armature of the magnetic release striker and hits the first arm 78 of the hammer 77. Since he strikes from right to left, he also pivots the hammer 76 in a clockwise direction, thereby the unlatching is unlatched.

The hammer 76 also has a nose 84 which projects in the direction of the second partial lever 65 of the contact lever 62. Now, if the striker pivots the hammer 77 in a clockwise direction during a magnetic release, then the nose 84 strikes the contact lever 62 after the unlatching of the latching point and strikes it in the switch-off position shown in FIG. In this case, the movable contact piece 68 is torn away from the fixed contact piece 70, wherein an arc is formed, which is deleted in a here in the figures by the reference numeral 85, only partially indicated arc quenching. The arc quenching device comprises in a known manner an arc splitter stack with a pre-chamber space, which may be bounded by Vorkammer-cover plates parallel to the Gehäusebreit- sides, and to which the arc is passed by means of two arc guide rails out.

On the hammer 77 is located in the vicinity of the stationary axis 76, a second projection or a second nose 284, which points to the contact lever 62. The second nose 284 serves to limit the Verschwenkungsweges of the hammer 77 when it is pivoted in a thermal or magnetic release in a clockwise direction. On the inside of the housing broad side, a second stop 290 is fixedly formed for this purpose, see FIG. 1.

The percussion lever 77 lies in its longitudinal direction approximately in an imaginary plane which is perpendicular to the housing half shell 11 and extends through the contact point formed from the movable and the fixed contact piece 68,70. In this way, a very compact and space-saving mutual arrangement of subassemblies switch lock, magnetic release, thermal release, contact lever with contact point can be realized.

The switch lock, the contact lever 62 with the contact point, the thermal release 75 and the hammer 77, so almost all mechanically moving parts are arranged together in a first half-space of the housing, extending from an imaginary center plane perpendicular to the housing sides through the Focus the axis 20 of the switch knob 19 extends, extending to a narrow side of the housing. In the other half space of the housing, which extends from the imaginary center plane to the opposite narrow side of the housing, the arc quenching device 85 and the magnetic release 73 is housed.

In the closed position, see Figure 3, the transmission bracket 80 and the first arm 78 of the hammer 77 form an angle of approximately 90 °. The second arm 43 of the release lever 40 also forms an angle of approximately 90 ° with the second partial arm 83 of the hammer 77. Furthermore, the first arm 78 and the second arm 83 of the hammer 77 are approximately equal in length. The thus designed lever arrangement ensures a very effective transmission of force from the strip 74 of the thermal release 75 via the transmission bracket 80 and the hammer 77 on the release lever 40, because because of the prevailing leverage ratio of 1: 1 and the right angle, the tensile force of the Transfer bracket 80 unabated transferred to the release lever 40.

In the off position shown in Figure 1 presses the contact pressure spring 69, which crashes with one end on the front side wall 14 of the housing, and with its second end in the receiving space 67 of the first partial lever 64, the contact lever 62 about the stationary axis 63 in Clockwise, so that the movable contact piece 68 is pushed away from the fixed contact piece 70. In this case, the movement path of the contact lever 62 is limited by a stop 71 fixedly connected to the first housing half shell, in other words, in the switch-off position, the contact lever 62 bears against the stationary stop 71. The fixed stopper 71 is formed by a bolt integrally connected to the housing half shell, which can be manufactured together with the housing half shells in an injection molding process, for example.

In the open position, the contact lever 62 pushes the action of the intermediate lever 33 with the pawl lever 37, the end of the bracket 27 which is held in the long hole-like opening 24, in this direction away from the Verklinkungsstelle. The bracket 27 can thus obliquely above, in the slot-like opening 24 in and thus avoid the Verklinkungsstelle. If the opening 24 is not an oblong hole, but a round eye, which is exactly adapted to the diameter of the end of the bracket 27, the bracket could be at wide open contact lever 62 only after dodge down towards the latching point. He would then press the nose 49 on the pawl lever so far down that when the action of the thermal or magnetic release decreases and the trigger lever 40 returns to its original position, the nose 49 is no longer on the locking surface 44 on the trigger 40th could meet. Then the Verklinkungsstelle would no longer latch and upon movement of the switch knob in the closed position shown in FIG. 3, the contact point could not be closed. This disadvantage in known switching devices is avoided by the inventive design of the openings 24 and 25 as elongated holes whose longitudinal axis 241 is oriented at an angle to the longitudinal center axis 181 of the switching handle 18.

LIST OF REFERENCE NUMBERS

10 Circuit breaker 80 Ubertragungsbügel

11 first housing half-shell 81 guide groove

12 front front wall 82 side walls

13 Rear front wall 83 Second arm

14 front side wall 84 nose

17 opening 85 arc extinguishing arrangement

18 Handle 284 Second nose

19 Knob 290 Second stop

20 housing-fixed axis 201 opening

21 projection 181 longitudinal central axis of

22 projection 241 longitudinal axis of the long

23 recording room

24 slot-like opening

25 slot-like opening

27 Temple

30 Ironing bar

31 latching opening

33 intermediate lever

37 latch lever

38 cones

40 release lever

43 Second arm

44 locking surface

49 Nose on the latch lever

50 joint chain

60 recess

61 pen

62 contact lever

63 axis

64 first part levers

65 Second part lever

66 slot

67 recording room

68 Movable contact piece

69 contact pressure spring

70 Fixed contact piece

71 stop

72 coil

73 Magnetic release

74 stripes

75 Thermal release

76,176 Fixed axis

77 hammer

78 First arm

79 opening

Claims

claims

Electrical service switching device (10), in particular circuit breaker, with a magnetic release (73) and / or with a thermal release (75), with a switching mechanism with a Verklinkungsstelle (49,45), with a in an axis (20) mounted switch knob ( 19) for manual actuation of the switch lock, which is connected by means of a coupling element (27) with one end of an intermediate lever (33) whose other end is coupled to a contact lever (62) carrying the movable contact piece (68), wherein the switch knob (19 ) a double-arm lever is provided with a switching handle (18) and at least one projection (21), and wherein in the projection (21) has a passage opening (24) is inserted, in which a leg of the coupling element (27) is inserted,

characterized in that the passage opening (24) is formed as a slot whose longitudinal axis (241) with the axis (20) extending longitudinal central axis (181) of the control handle (18) forms an angle (a) of less than 45 °.

Electrical service switching device (10) according to claim 1, characterized in that the angle (a) is between 5 ° and 20 °.

Electrical service switching device (10) according to claim 2, characterized in that the angle (a) is between 10 ° and 13 °.

Electrical service switching device according to claim 1, characterized in that the switching knob diametrically opposite the handle two fork-shaped projections (21, 22) which leave a unilaterally open receiving space (23) between them, wherein in each of the two projections (21, 22) a passage opening (24, 25) in the form of a slot is formed.

Electrical service switching device according to claim 1, characterized in that the coupling element (27) is a U-shaped bracket with a U-leg connecting the strap web