EP1096529B1 - Protective electrical circuit-breaker - Google Patents

Description

The invention relates to an electrical circuit breaker, in particular Motor protection switch, according to the preamble of claim 1.

From DE 42 08 716 C2 or from EP 0 333 650 A such switching devices are already known. These circuit breakers also have an insulating material with a Switching device and a trip unit with a short circuit sensitive electromagnetic quick release on.

Known safety devices have a trip bridge that is directly actuated by a quick release plunger.
Depending on the device size or current range, this results in a different magnet stroke for the quick release.
A use of auxiliary components or accessories, so-called AGM modules (tripping detector), which have an interface to the tripping bridge, is not readily possible due to this different Magnetethubes also for larger sizes.

The invention is based on the object, a generic switching device to create, which is so improved in its construction that a Universal use of auxiliary blocks that provide an interface to the Tripping bridge, is possible.

Based on a protective device of the type mentioned is the Object according to the invention by the characterizing features of independent claim, while the dependent claims advantageous developments of the invention can be seen.

By the invention it is possible to auxiliary blocks of smaller device series to use. This lowers the development, production and storage costs.

Figur 1:

ein Schutzschaltgerät gemäß der Erfindung in Perspektivansicht;

Figur 2:

die Auslöseeinheit des erfindungsgemäßen Schutzschaltgerätes in Explosionsdarstellung;

Figur 3a:

einen auswechselbaren Aufnahmekörper mit Magnetanker und Federelement in Explosionsdarstellung;

Figur 3b:

eine Schnittdarstellung des Aufnahmekörpers entlang der Linie A-A in Fig. 3a;

Figur 3c:

eine Schnittdarstellung des Aufnahmekörpers entlang der Linie B-B in Fig. 3a;

Figur 4:

eine vormontierte Auslöseeinheit mit separatem vormontierten Aufnahmekörper; und

Figur 5:

ein Schaltgerätegehäuseteil mit eingebauter Auslöseeinheit und separatem vormontierten Aufnahmekörper.

Figur 6:

eine Darstellung des Magnetankers von einer Seite;

Figur 7:

eine Darstellung des Magnetankers von einer anderen Seite;

Figur 8:

eine Schnittdarstellung des Magnetankers;

Figur 9:

eine andere Schnittdarstellung des Magnetankers;

Figur 10:

eine Schnittdarstellung des Schnellauslösers;

Figur 11:

eine vergrößerte Schnittdarstellung des Auslösebereichs Schnellauslösers.

Further details and advantages of the invention will become apparent from the dependent claims and the following, explained with reference to figures embodiment. Show it

FIG. 1:

a protective switching device according to the invention in perspective view;

FIG. 2:

the trip unit of the protection switching device according to the invention in an exploded view;

FIG. 3a:

an exchangeable receiving body with armature and spring element in exploded view;

FIG. 3b:

a sectional view of the receiving body along the line AA in Fig. 3a;

FIG. 3c:

a sectional view of the receiving body along the line BB in Fig. 3a;

FIG. 4:

a preassembled trip unit with a separate preassembled receiving body; and

FIG. 5:

a switching device housing part with built-in trip unit and separate pre-assembled receiving body.

FIG. 6:

a representation of the armature from one side;

FIG. 7:

a representation of the armature from another side;

FIG. 8:

a sectional view of the armature;

FIG. 9:

another sectional view of the armature;

FIG. 10:

a sectional view of the quick release;

FIG. 11:

an enlarged sectional view of the release area quick release.

Fig. 1 shows an electrical circuit breaker 1, in particular Motor protection switch, with a rotary drive and a rotary head 11 for on and Switching off and displaying tripping in case of overload or short circuit and with a housing 12 which is divided into three housing parts 13, 14, 15. The middle one Housing part 14 has cable entry openings 16 with cable clamps 17.

Fig. 2 shows the trip unit of the invention Protective switching device in an exploded view. It includes the Tripping unit a parts carrier 5, to which a connecting piece 6 can be fastened. The parts carrier 5 is advantageously made of a thermoplastic plastic.

The connecting piece 6 is made of copper and is L-shaped, wherein the lower outwardly directed leg 18 is provided as a contact tapping for the cable clamp 17.
The parts carrier 5 has a fixing pin 23 which projects into a corresponding recess on the lower leg 18 of the connecting piece 6.

The upper leg 21 is provided with a connection zone 19 for connection of an overcurrent or bimetallic release 9. In this case, a heating conductor 22, in particular by means of a plasma or inert gas welding connection, connected via the connection zone 19 with the connecting piece 6. For this purpose, the heating element 22 is placed in a known manner spirally around a bimetal 8 and at its other free end, preferably also by means of a plasma or inert gas welding connection, connected to the bimetal 8.
The inert gas welding connection between the copper and the bimetal 8, which is very difficult to weld, establishes a secure connection, thereby eliminating quality problems in this respect.
With the inert gas or plasma welding, the heating element 22 is welded to the passive side of the bimetal 8. The passive side of the bimetal 8 is well suited for welding because only the active side is made of an alloy that is relatively difficult or impossible to weld.

The lower end of the bimetal 8 is connected to a yoke plate 28 at an outwardly bent tongue 33 perpendicular.
The yoke plate 28 consists of a substantially U-shaped region with two parallel side limbs 29, 31 and a transverse leg 30 connecting them holding the quick release 10, one at the second leg 31 at right angles integrally connected mounting portion 32 and a tongue 33rd

At the attachment portion 32, a fixing tab is arranged, which in a elongated, provided with Fixiernoppen, latching opening of the parts carrier. 5 intervenes. As a result, the yoke plate 28 is fastened in the part carrier 5.

To the attachment portion 32 of the yoke plate 28 is a, substantially L-shaped contact element 7 with one of its leg parts arranged parallel to each other.

The trip coil 38 of the quick release 10 is its one coil end with the contact element 7 and with its other coil end to the yoke plate 28 connected to the attachment portion 32. The connection also takes place preferably by inert gas or plasma welding.

The parallel to the attachment portion 32 extending leg portion of the Contact element 7 is partially provided with recesses to Parts of the yoke plate 28 interlock. This will be extremely built to save space.

In the lower part of the parts carrier 5, a slot motor 47 is pre-assembled.

In a particularly preferred embodiment, the trip unit fixed only by gluing in the housing 12 (i.e. Screwing, locking, bracing or the like). As special Suitable splices have extensions on the voltage-carrying Share proved. In the illustrated embodiment, at least one first Klebefortsatz K1 at the connection zone 19 of the connecting piece 6, a second adhesive extension K2 on the tongue connected to the yoke plate 28 33 and a third and fourth adhesive extension K3, K4 on the yoke plate 28 itself, in Corner of side legs 29 and transverse leg 30, arranged.

The flow of current in the arranged on the parts carrier 5 parts is made by the lower leg of the connector 6 to the weld Connecting zone 19 / heating element 22, then in the heating element 22nd up to the welded joint heating element 22 / bimetal 8, then via the bimetal 8 up to the welded joint bimetal 8 / yoke plate 28, then over the attachment portion 32 of the yoke plate 28 to the Weld connection attachment section 32 / trip coil 38, then about the winding of the trip coil 38 up to the weld joint Trip coil 38 / contact element 7 in the contact element 7 to Continuation of the current via the with the contact element. 7 cooperating movable contact element.

3a shows a preassemblable unit with a receiving body 60, a Magnetic armature 62 and a spring element 64 in an exploded view.

The magnet armature 62 has a first part MA ₁ , a second part MA ₂ , and a third part MA ₃ , wherein the second part MA _{2 is arranged} between the first part MA ₁ and the third part MA ₃ .

The armature 62 is formed substantially rod-shaped, with its lower part MA _{1 has} a nearly square cross-section and its upper part MA _{2 is formed} as a pin-shaped extension significantly lower and in particular circular cross-section. In this case, the upper part MA _{2 is} advantageously not centric, but arranged offset from the center of the armature 62. At its free end, the upper part MA _{2 is expanded} by a preferably plate-like head piece 63. The magnet armature 62 is made of a magnetizable material.
The magnet armature body (with the exception of the head piece 63) can for example be easily rotated from a square profile. It can be made by centering the material in the central axis of the square profile, the lower part MA ₁ and centering of the material from the center of the profile, the upper part MA ₂ manufactured (eg by turning on a lathe).

The receiving body 60 is made of insulating material and serves to accommodate the Magnetic armature 62 and the spring element 64. In this case, the armature 62nd longitudinally movable in the, substantially tubular, Receiving body 60 stored. By the spring element 64, which is preferably designed as a torsion spring and also in, respectively on, the receiving body 60 is arranged, the armature 62 is opposite its triggering movement direction (here: down) with a spring force applied. For this purpose, the torsion spring supports with its one free end an abutment 66 of the receiving body 60. With her other free End behind the torsion spring engages behind the head 63 of the armature 62 and acts on this by a spring force against his Triggering movement direction.

The end of the spring element 64 engaging on the head piece 63 engages on a free area 80 of the second part MA ₂ near the center of the axis of the magnet armature 62. On the free area 80 of the second part MA ₂ , in the vicinity of the axial center of the magnet armature 62 also a triggering element 81 of a trip bridge arranged. The triggering element 81 is hook-shaped.

The receiving body 60 consists essentially of a lower, tubular section I and a head section II.

The section I is used in its upper part I _{1 of} the guide of the armature 62 and in its lower part I _{2 of} the attachment within the quick release 10. In its upper part I ₁ , the receiving body 60 in adaptation to the lower part MA _{2 of} the armature 62th the wall area narrowing the circular cross-section (according to FIG. 3b). In its lower edge open part I ₂ , the receiving body 60 in its interior in adaptation to the cross section of the magnet armature 62, in particular circular, formed (Figure 3c).

For the mounting of the armature 62 in the receiving body 60 of the armature 62 is preceded by its head 63, introduced from below into the lower part I _{2 of} the receiving body 60. In a preassembled rest position of the armature 62 is biased within the receiving body 60 by a free, under the head piece 63 of the armature 62 cross, end of the torsion spring against the Auslösebewegungsrichtung. In this case, the armature 62 is limited by the transition plane formed between upper and lower part of the armature 62 MA _Ü , which cooperates with a particular annular abutment in the interior of the receiving body 60 in its displacement against the Auslösebewegungsrichtung. In this way, in the preassembled unit (60, 62, 64) mounted armature 62 is movably mounted between the described rest position and a tripping in the direction of release position. The triggering position is achieved upon the occurrence of a certain magnetic field and thus at a certain short-circuit current level by the longitudinally mounted armature 62 and the fixed magnetic core 68 are magnetized by the generated magnetic field and attract by the magnetic effect. The achievable at a certain current displacement of the armature 62 and the spring force with which the armature 62 is biased against the release movement direction, interact. Thus, by the dimensioning of the torsion spring of the limiting current adjustable at which the quick release 10 should trigger. For the tripping operation, the armature 62 acts on a percussion armature 69 guided in some regions in the magnetic core 68.

According to Figure 4, the receiving body 60 for attachment to the quick release 10 with its lower open end of section I through an opening 29a of the side leg 29 on the magnetic core 68 of the quick release 10th releasably attached (force-fit). This will be a simple Interchangeability of the preassemblable unit consisting of receiving body 60, armature 62 and spring element 64 guaranteed. This has one facilitated assembly and a simplified dimensioning of Switching devices with respect to their thresholds for short-circuit currents result. So that the unit 60, 62, 64 is secured against rotation in the short-circuit release 10, have the receiving body 60 and the side legs 29 corresponding Anti-rotation means 70, 71 on. For this purpose, the receiving body 60 preferably with a circumferentially arranged outwardly directed Fixation formed during the side legs 29 in his Opening 29a one cooperating with the fixation process Has recess.

As can be seen in FIG. 11, the triggering element 92 is of a type Translation member 96 is actuated, which is on the trigger bridge 90th acting stroke movement by a ratio smaller than 1: 1 transfers. This means that the lifting movement of the armature can be greater, as the actually required lifting movement. The to the interface 91 for the auxiliary block acting stroke is reduced

The translation member 96 is a spring end of the spring element 64th trained operating lever 93.

The actuating lever 93 is located at its actuating end 94 at a Head piece 63 of the magnet armature 62 under spring action, wherein the Triggering element 92 is operatively connected to an actuating point 95 and wherein the actuating point 95 of the actuating lever 93 between the Operating end 94 and the fulcrum 97 is arranged.

By the invention it is possible to reduce the angular position such that reduces the effective distance of the interface from 6mm to 4.2mm becomes. The trip bridge has a pivotable tongue that the Release message indicates. The route is the hub, the tongue performs.

LIST OF REFERENCE NUMBERS

switchgear

1

parts carrier

5

connector

6

contact element

7

bimetallic

8th

Overcurrent release

9

instantaneous release

10

turret

11

casing

12

housing parts

13, 14, 15

Cable entry holes

16

cable clamp

17

lower thigh

18

connecting zone

19

upper leg

21

heating element

22

fixation pin

23

yoke plate

28

side leg

29, 31

transverse leg

30

Fastening portion

32

tongue

33

trip coil

38

receiving body

60

armature

62

headpiece

63

spring element

64

abutment

66

magnetic core

68

impact armature

69

anti-rotation

70, 71

free area

80

triggering element

81

tripping bridge

90

interface

91

triggering element

92

actuating lever

93

actuating end

94

actuation point

95

transmission member

96

Fulcrum

97

Claims (9)

1. Electrical circuit breaker (1), in particular a motor circuit breaker, having a dielectric enclosure (12), a switching contact arrangement, a tripping unit with an electromagnetic quick-action release (10) comprising a tripping coil (38), a magnet core (68), a magnet armature (62) (with the magnet armature (62) being mounted in a holding body (60) such that it can move longitudinally), and is acted on in the opposite direction to its tripping movement by a spring element (64), an impact armature (69), a tripping link (90), which acts on a latching mechanism, can be operated by the magnet armature (62) and has a tripping element (92), and an interface (91), which is connected to the tripping link (90), for an auxiliary module, in which case the tripping element (92) can be operated by an operating lever (93) characterized in that the operating lever (93) is in the form of a spring end of the spring element (64), and in that the operating lever (93) transmits the linear movement acting on the tripping link (90) with a step-ratio of less than 1:1.
2. Circuit breaker according to Claim 2, characterized in that the spring element (64) is a rotary spring.
3. Circuit breaker according to one of the preceding claims, characterized in that the operating end (94) of the operating lever (93) rests on a head piece (63) of the magnet armature (62) with a spring effect, and in that the tripping element (92) is operatively connected to an operating point (95), with the operating point (95) of the operating lever (93) being arranged between the operating end (94) and the lever fulcrum (97).
4. Circuit breaker according to one of the preceding claims, characterized in that the magnet armature (62) has a first part (MA₁), a second part (MA₂) and a third part (MA₃), in that the second part (MA₂) is arranged between the first part (MA₁) and the third part (MA₃), in that the second part (MA₂) is a projection, in the form of a pin, with a considerably smaller cross section than the first part (MA₁), in that the second part (MA₂) is not arranged centrally, but offset from the axis centre of the magnet armature (62), in that the third part (MA₃) is in the form of a headpiece (63) on which the spring element (64) is supported, in that at least part of the spring element (64) is arranged in the area of the second part (MA₂), and in that the third part (MA₃) is a headpiece (63) in the form of a plate.
5. Circuit breaker according to the preceding claim, characterized in that the first part (MA₁), the second part (MA₂) and the third part (MA₃) are integrally connected to form a single magnet armature body, in that the second part (MA₂) of the magnet armature body is turned from a quadrilateral profile in such a way that, during the centring process, the centre axis of the quadrilateral profile is arranged offset from the profile centre.
6. Circuit breaker according to one of Claims 4 or 5, characterized in that the spring element (64) is arranged in or on the holding body (60), with a spring force acting on the magnet armature (62) in the opposite direction to its tripping movement direction, with the free end of the spring element (64) being supported on an opposing bearing (66) on the holding body (60), and in that the other free end of the spring element (64) grips a headpiece (63) of the magnet armature (62) so that a spring force in the opposite direction to its tripping movement direction is applied to the magnet armature (62).
7. Circuit breaker according to one of Claims 5 or 6, characterized in that that end of the spring element (64) which acts on the headpiece (63) acts on a free area (80) of the second part (MA₂) in the vicinity of the axis centre of the magnet armature (62), and in that a tripping element (81) of a tripping link (90) is arranged on a free area (80) of the second part (MA₂), in the vicinity of the axis centre of the magnet armature (62).
8. Circuit breaker according to one of the preceding claims, characterized in that the tripping element (81) is in the form of a hook.
9. Circuit breaker according to one of the preceding claims, characterized in that the lower part (MA₁) of the magnet armature (62) and that part (I1) of the holding body (60) which guides the lower part (MA₁) are designed to match one another such that the magnet armature (62) is guided in the holding body (60) such that it cannot rotate.

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