EP1157400B1 - Magnetic trigger, especially for a circuit breaker, and circuit breaker having such a magnetic trigger - Google Patents

Abstract

A magnetic release is described for an electrical switching device, such as a circuit breaker, which has a coil, a core located inside the coil, and an armature in the form of a plunger-type armature which can move inside the coil or in the form of a hinged armature. The coil is stamped and bent from sheet metal composed of an electrically highly conductive material. It has first webs that are located at a distance from one another in a first plane and second webs that are likewise located at the same distance from one another in a second plane. The webs each run parallel to one another and are offset with respect to one another in such a manner that the webs are disposed with connecting webs in a helical shape around a center axis, and on the inside form a through-opening for accommodating at least one core.

Description

The invention relates to a magnetic trigger for a switching device, in particular for a circuit breaker, according to the preamble of claim 1.

The invention further relates to a circuit breaker with a magnetic release according to the preamble of claim 8.

A magnetic release especially for a circuit breaker includes one Coil made of helically wound wire, one with a die Coil surrounding the yoke firmly connected magnetic core, which is inside the Engages coil, and a magnetic armature, either as a hinged armature or as Immersion anchor is formed, the latter also being located within the coil. In a known embodiment, the core and the armature are within one cylindrical tube, the anchor to the core by means of a compression spring at a distance is held so that the anchor with respect to the core when there is an over or Short-circuit current is attracted against the force of the spring. The coil is connected at one end to the yoke, which holds a holder for a bimetal has and on the other carries a fixed contact piece that in an arc guide rail passes, which delimits an arc-quenching plate package on the trigger side and the arc base at the fixed contact piece, the quenching plate package supplies.

With such an arrangement, an insulated wire must be used to manufacture the coil Copper stripped at the ends and wound helically, resulting in a high Working time means. In addition, the yoke can also be assigned a yoke, which carries the coil tube around which the insulated wire is wound and in which the anchor and core are guided. To produce this arrangement is complex.

The object of the invention is a magnetic trigger of the aforementioned To create a type whose production is simplified.

This object is achieved according to the invention by the features of claim 1.

After that, the coil of sheet metal is made of electrically and magnetically highly conductive material punched and bent; spaced apart and in a first plane are the first webs; second webs are equally spaced from one another in a second plane, wherein the first and second webs run parallel to each other and against each other are offset. Between each end of the first and the adjacent end of the second and one end of the second and the adjacent ends of the first webs connecting webs are provided such that the webs with their connecting webs are arranged helically around a central axis and within one Form a through opening for receiving the core and anchor. On this coil is additional a fixed contact piece of a contact point of the circuit breaker attached as well as a holder for a thermal release.

According to a further embodiment of the invention, the fixed contact piece is connected an arc guide rail for an arc quenching package formed.

A core can also be molded onto the coil.

This forms the coil, the fixed contact piece, the arc guide rail and the holder a unit for the thermal release and possibly the core; wire windings are no longer required. Since the coil is made of sheet iron, is an independent yoke is also no longer required.

A coil as such, without fixed contact piece, arc guide rail and holder for the thermal release is known from DE 6 66 920. This Coil is mainly used as an excitation coil of synchronous machines or DC machines to replace the flat, edgewise wound conductors.

Such a design of the coil can simply be punched out of a Sheet metal and be produced by folding or bending, so that special winding devices with mandrel and the like are no longer required.

According to a further embodiment, the first and second webs are U-shaped formed, the U-shape of the first and the second webs to the opposite Level is open.

The connecting webs can then advantageously alternately at one end each web on one leg and at the other end on the other leg of the Connect U shape.

This results in an accordion-like screw-shaped stamped and curved Coil made of sheet metal made of electrically and magnetically highly conductive material, being, because the individual turns are not against each other, the sheet is not insulated Material must be coated.

Using the drawing, in which two embodiments of the invention are shown are, the invention and other advantageous refinements and improvements the invention are explained and described in more detail.

Fig. 1

eine stirnseitige Ansicht einer erfindungsgemäßen Spule, ohne Festkontaktstück, Lichtbogenleitschiene und Halterung für ein Thermobimetall,

Fig. 2

eine Aufsicht auf die Spule gemäß Pfeilrichtung II der Fig. 1,

Fig. 3

eine Ansicht der Spule gemäß Pfeilrichtung III der Fig. 2,

Fig. 4

eine Abwicklung der Spule gemäß den Fig. 1 bis 3 als Blechstanzteil,

Fig. 5

eine Seitenansicht der Spule mit einem Festkontaktstück, der Lichtbogenleitschiene sowie der Halterung für ein Thermobimetall,

Fig. 6

eine Aufsicht auf eine weitere Ausgestaltung der Spule und

Fig. 7

eine Schnittansicht gemäß Schnittlinie VII- VII der Fig. 6.

Show it:

Fig. 1

2 shows an end view of a coil according to the invention, without a fixed contact piece, an arc guide rail and a holder for a bimetal,

Fig. 2

2 shows a top view of the coil in the direction of arrow II in FIG. 1,

Fig. 3

2 shows a view of the coil in the direction of arrow III in FIG. 2,

Fig. 4

a development of the coil according to FIGS. 1 to 3 as a stamped sheet metal part,

Fig. 5

a side view of the coil with a fixed contact piece, the arc guide rail and the holder for a thermobimetal,

Fig. 6

a supervision of a further embodiment of the coil and

Fig. 7

6 shows a sectional view along section line VII-VII of FIG. 6.

Reference is now made to FIG. 5. FIG. 5 shows a side view of a 3, which has been given the reference number 80 in FIG. 5. On the one in the Fig. 5 top end of the coil 80 located coil bridge 81 is a U-shaped extension 82 integrally formed, the open side 83 of which is directed towards the coil 80. The directly on the leg 84 adjoining the spool 81 carries the U-shaped extension 82 a not shown fixed contact piece for a circuit breaker that with a movable contact piece cooperates, such as in the switching device S 2 from ABB Stotz-Kontakt GmbH, Heidelberg. The thigh 84 runs parallel to the coil bridge 81 and at an acute angle to the leg 84 runs another leg 85, to which an arc guide rail 86 connects, which runs parallel to the central axis M-M of the coil 80. This arc guide rail delimits an arc quenching stack on that adjacent to coil 80 Page.

The coil land 87 of the coil 80, which is located at the opposite end, in FIG. 5 at the lower end of the coil 80, has a bend 88 running perpendicular to it, which runs parallel to the central axis MM, approximately in the plane E ₁ , see also Fig. 3; a leg 89 of a holder 90 for a thermal bimetal 100 is formed thereon; the bimetallic metal 100 is fixed to the other, free leg 91 of the holder 90. At the connection point of the leg 88 and the leg 89, a tab 93 is formed which runs parallel to the coil web 87 and which cooperates with the leg 91; through the leg 91, a threaded screw 94 is screwed, the other end of which rests according to arrow P against the surface of the tab 93 opposite the leg 91, so that the distance between the tab 93 and the free end of the leg 91 can be changed so that Thermobimetal 100 can be adjusted. Such a bracket itself is also provided in the circuit breaker S 2 mentioned above.

5 that the coil 80, the extension 82 with the fixed contact piece on the leg 84, the arc guide rail 86 and the holder 90 form a unit for the bimetallic 100. There is a inside the coil An anchor, not shown, and a fixedly connected to the coil 80, also not Shown core, wherein the core are attached to the coil land 81, for example or molded (see FIGS. 6 and 7). If necessary, can lead an anchor guide tube (not shown in more detail) of the anchor can be provided.

Since the coil is made of magnetically highly conductive material, it is an independent one Yoke no longer required

Reference is now made to FIGS. 2 and 3 to illustrate how the coil 80 for the trigger can be made.
3, webs 10, 11 and 12 .... can be seen, which lie approximately in a first plane, the distance D from each other being the same. The first level is represented by line E ₁ . A second plane E _{2 is} spanned parallel to the first plane, in which second webs 20, 21... The first and second webs 10, 11, 12, ...; 20, 21, ... run parallel to one another and are each offset from one another and each have a U-shape, the open sides 30, 31, 32 and 40, 41 ... of which are each open to the opposite plane. The web 10 is connected to the web 20 with an inclined connecting web 50; the web 20 is connected at the opposite end to the web 11 via a connecting web 51, the web 11 to the web 21 via a connecting web 52 at the opposite end, etc., so that there is a coil of connecting webs arranged in a zigzag shape and winding around a central axis MM , first and second webs. A wall-shaped connecting line 61 is connected to the first web 10 via a connecting web 60, and, for example, a fixing point for a bimetallic strip can be attached or formed on the opposite last web.

Fig. 4 shows the development of the sheet metal shape after punching, but before Bending, with the webs 10, 11 and 12 ... and the webs 20, 21 ... with the connecting webs 60, 50, 51, 52 ... all lie on one level.

For forming the coil of the bending line is corresponding to B _1, the web 10 folded such that the U-form pointing to the drawing plane; the web 20 is bent according to the bending line B ₂ so that the U-shape is open to the viewer; the web 11 is again folded so that the tip faces the viewer and the open U-shape faces the plane of the drawing, etc., so that only a bend around the bending lines B ₁ , B ₂ , B _3. . is required.

In Fig. 3 it is shown that the connecting webs 50, 51, 52, 60 each have an angle form with each other. Depending on the number of turns that are required for a corresponding one Use case, the connecting webs 50, 51, 52 ... and the Web 60 run parallel to one another, the U-shape rounded off with two parallel ones Legs or angular can be formed.

The arrangement of the individual connecting webs and connections is shown in FIG. 1 a top view according to arrow direction 1 of FIG. 2 shows. Due to the special arrangement, Punching out and winding form a coil which surrounds an interior space 70, whose central axis corresponds to the central axis M, and can be in this recess 70 a coil tube 71 can be used, in which a core 72 and shown in dashed lines an anchor 73 is located; the coil tube 71 corresponds to the usual coil tubes, such as they are available and known in commercially available magnetic releases.

Steel tape can be used as the material, which is used to achieve an improvement the electrical conductivity is copper-clad on both sides; such steel strips are commercially available.

The yoke that is usually present in a magnetic release can be in one piece be integrally formed on the coil in which, for example, the feed line 61 is shaped accordingly is. At the same time, the core can also be attached to the connecting conductor 61, who could also have a permanent contact.

If the coil is inserted into a housing, then it will be convenient Projections are provided on the inner surface of the housing, which protrude into the space between engage the individual bars 20, 21 or 10, 11 ... to guide the coil and to prevent the individual connecting webs from occurring when a short circuit occurs 60, 50, 51, 52 ... against each other, which is not drawn is.

The armature or core drawn circular in FIG. 1 can also have a cross section be rectangular; it can be in a bobbin tube as shown or in housing protrusions be guided on the guide rails or guide projections are present on the housing for guiding and holding the coil.

The invention is illustrated with the aid of a plunger magnet trigger; it exists of course, the possibility to design the core so that it completely the coil engages, then the anchor can also be designed as a hinged anchor. Because the coil is made of iron, it acts as a yoke. At high currents CU-clad iron can be used.

This gives the yoke, coil, fixed contact piece and thermobimetal fixation together with an arc guide rail made from a single piece that is used as a stamping and bending material can be made from sheet metal.

Reference is now made to FIGS. 6 and 7.

6 is a plan view of a modified coil according to FIG. 1. In order to illustrate which elements are the same becomes the reference numerals used in Fig. 1 used here.

6, which has been given the reference number 110 here, is in the same way constructed and manufactured like the coil of FIG. 1; this can be seen from the reference numbers 10, 11, 12 ..... 20, 21 ...., 51 ..... 61 .....

If one takes the coil according to FIG. 5, then would be on the web, which in FIG. 5 with the Reference numeral 81 is shown, and which also bears reference numeral 81 in FIG. 7 Shaped web 111, which projects into the inner region 71 of the coil and on the inner End approximately in the center line M-M (see Fig. 5) carries a leg 112 which is parallel to Center line and protrudes into the inside of the coil 110. This leg 112 serves 5, in conjunction with FIGS. 6 and 7.

It should also be pointed out that the dimensions of the arrangement according to FIG. 6 and 7 are not to scale.

Claims (10)

1. Magnetic release for an electrical switching device, in particular for a circuit breaker, having a coil, having a core which is located within the coil, and having an armature which may be in the form of a plunger-type armature, which can move within the coil, or a hinged armature, characterized in that the coil is stamped and bent from sheet metal composed of electrically highly conductive and magnetically highly permeable material, in that first webs (10, 11, 12 ...), which are located at a distance from one another in a first plane (E₁), and second webs (20, 21, ...), which are likewise located at the same distance from one another in a second plane (E₂), each are parallel to one another and are offset with respect to one another, in that connecting webs (50, 51, 52, ...) are in each case provided between one end of the first webs and the adjacent end of the second webs and in each case one end of the second webs and the adjacent end of the first webs, such that the connecting webs of the webs are arranged in a helical shape around a centre axis (M) and, on the inside, form a through-opening for holding at least the core, in that the coil (80) is also fitted with a stationary contact piece for a contact point of a circuit breaker, and in that an extension (90) for a thermal release (100) is integrally formed on the coil.
2. Magnetic release according to Claim 1, characterized in that an arc guide rail (86) is integrally formed on the coil that is adjacent to the stationary contact piece for an arc splitter stack for quenching arcs within the electrical switching divice.
3. Release according to one of Claims 1 and 2, characterized in that an L-shaped lug is integrally formed at one end on the coil, and its free limb projects into the coil area, along its centre axis, and forms the core of a magnetic release.
4. Magnetic release according to one of Claims 1 to 3, characterized in that the first and second webs (10, 20, 11, 21, ...) are U-shaped, with their U-shape being open towards the opposite plane.
5. Release according to one of the preceding claims,
   characterized in that the connecting webs (50, 51, 52, ...60) are alternately connected to one end of each web on one limb, and to the other end of each web on the other limb of the U-shape.
6. Release according to Claim 5, characterized in that the connecting webs each enclose an angle between them, and one connecting web runs above the others, parallel to one another.
7. Release according to one of Claims 1 to 5, characterized in that the connecting webs (60, 50, 51, 52 ...) run parallel to one another and at right angles to the centre axis (M).
8. Circuit breaker having a magnetic release according to one of Claims 1 to 7, characterized in that the mutually opposite inner surfaces of the enclosure have strips, which engage between the coil turns in order to guide the coil.
9. Circuit breaker according to Claim 8, characterized in that the strips are designed such that they are used to guide the magnet core and/or the magnet armature.
10. Circuit breaker according to one of Claims 8 and 9, characterized in that the core, the stationary contact piece and the arc guide rail are arranged at one end of the coil, and the extension for the thermal release is arranged at the other end.

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