DE102011014061A1 - Magnetic system and installation switching device - Google Patents

Abstract

The invention relates to a magnet system (1) for a circuit breaker (2), comprising a yoke (3), a coil (4), a sleeve (5), a magnetic core (6), a plunger (7), a magnet armature (8 ) and a restraining spring (9), wherein on the yoke (3) a conductor piece (10) is formed which carries a fixed contact piece (11), and wherein the armature (8) in the sleeve (5) against the force of the restraining spring ( 9) is guided displaceably. The magnet core (6) is fixed to the conductor piece (10), the sleeve (5) is engaged at its first end with the magnetic core (6), and the magnet armature (8) is at the second end of the sleeve (5) in FIG the sleeve (5) and executable.

Description

The invention relates to a magnet system for a circuit breaker, comprising a yoke, a coil, a sleeve, a magnetic core, a plunger, a magnet armature and a fetlock spring, wherein on the yoke, a conductor piece is formed, which carries a fixed contact piece, and wherein the armature in the sleeve is displaceably guided against the force of the restraint spring, according to the preamble of claim 1.

The invention further relates to a method for producing a magnet system, according to the preamble of claim 8.

The invention further relates to a circuit breaker with a Isolierstoffgehäuse and with a magnet system, according to the preamble of claim 9.

A generic magnet system is for example in the DE 198 45 476 A1 shown.

Circuit breakers with magnetic systems are used in electrical engineering to protect circuits against overload, z. As by short circuits or the like, and are used to automatically disconnect a line, d. that is, they trigger when such an overload occurs. For some possible overload cases, a magnet system is used to trip the circuit breaker. The magnet system has a movable armature, which in the rest position partially protrudes into a current-carrying coil flowing from the current in the line to be monitored. If the current in the coil is greater than a predetermined tripping current, the armature is displaced by the resulting magnetic field of the coil and triggers the circuit breaker via a plunger. Since the coil is always traversed by the current to be monitored, the trigger member, d. H. Anchor and plunger to be held by a shackle spring in a defined rest position to ensure a defined response of the circuit breaker and to avoid false tripping. Consequently, the magnet system must contain a plurality of different mechanical parts to ensure this reliability. To assemble this plurality of mechanical parts is time consuming and consequently expensive. For compliance with a predetermined triggering behavior, it is also significant that the air gap of the magnetic circuit of the magnet system is as independent of tolerances in manufacturing adjustable, which is why known magnetic systems sometimes quite expensive design measures provide for this.

It is therefore the object of the present invention to develop a magnet system such that its construction requires fewer parts and its assembly is further simplified, and to provide a method for its production. Further, it is an object of the present invention to develop a circuit breaker with a magnetic system so that the assembly of the magnet system in the circuit breaker further simplified and also the air gap of the magnetic circuit of the magnet system is tolerance independent.

The object is achieved with respect to the magnet system by a magnet system having the features of claim 1.

With regard to the method for producing a magnet system, the object is achieved by claim 8.

The object with respect to an improved circuit breaker is achieved by a circuit breaker having the features of claim 9.

Thus, according to the invention, the magnetic core is fixed to the conductor piece, and the sleeve is engaged with the magnetic core at its first end, and the magnet armature is at the second end of the Sleeve in the sleeve on and executable.

A magnet system according to the invention has very few individual parts, which in some cases assume multiple functions, is therefore very easy to assemble, even fully automatically at high speed. Thus, the magnetic core in addition to its actual function as a magnetic core in the magnetic circuit of the magnet system still fulfills the function of a holding member for the sleeve. A separate mounting device for the magnet system is not required, since according to the invention, the magnetic core is attached to the conductor piece, and the conductor piece, since it carries the fixed contact, must be held in the housing of a service switching device anyway. Thus, the magnet system is held on the holder of the conductor piece with the fixed contact when mounted in the housing, the sleeve is held over the magnetic core, and the armature is held in the sleeve. A rearward stop for the armature can be provided outside the magnet system, as the armature is insertable and executable into the sleeve at the second end of the sleeve. Therefore, the magnet system according to the invention is suitable for determining the distance between the magnet core and the magnet armature, which determines the air gap of the magnet system, by abutment means located outside the magnet system and thus can be adjusted independently of manufacturing tolerances of the magnet system.

According to an advantageous embodiment of the invention, the magnetic core has a penetrated by the plunger bore. This hole also acts as a guide member for the plunger, so that an independent guide member, as required in the prior art, is eliminated.

According to an advantageous embodiment of the invention, the bore is a stepped longitudinal bore with a larger diameter at the end facing away from the conductor piece end, and the diameter step forms a first stop for the fetlock spring. As a result, the restraint spring is mounted against rotation, an additional holding part for the restraint spring is not required.

According to an advantageous embodiment of the invention, the outer surface of the magnetic core, at least in the region of engagement with the sleeve, has a surface configuration which increases the friction between the magnetic core and the sleeve in this region. This can be done for example by an external circumferential structuring of the outer surface, such as a kind of corrugation or roughening over which the sleeve is pushed and thereby better holds, without a further fastening means, such as an adhesive layer, must be provided.

According to an advantageous embodiment of the invention, the plunger is inserted into a blind hole-like depression on an end face of the armature and secured therein. This can be realized for example by the fact that the plunger is pressed into the armature. This has the advantageous effect of an optimized, better return of the armature. Such a measure to be provided according to the invention has a particularly favorable effect on the tolerances in the flow.

According to an advantageous embodiment of the invention, the end face of the magnet armature forms the second stop for the fetlock spring. For this purpose, it advantageously has no contouring, that is to say in particular no hole or milled recess, in order to receive the fetlock spring. Advantageously, the restraining spring lies against the smooth end face. This has the beneficial effect of undisturbed and thus further improved magnetic properties of the magnetic circuit of the magnet system, which in particular a higher armature force is effected.

According to an advantageous embodiment of the invention, the magnetic core is riveted to the conductor piece.

• – Befestigen des Magnetkerns an dem Leiterstück,
• – Aufschieben der Hülse auf den Magnetkern,
• – Aufschieben der Fesselfeder auf den an dem Magnetanker ausgebildeten Stößel,
• – Einschieben des Magnetankers mit dem daran ausgebildeten Stößel und der darauf aufgeschobenen Fesselfeder in die Hülse,
• – Einsetzen der aus Magnetkern, Leiterstück, Hülse mit eingeschobenem Magnetkern gebildeten Einheit in das Gehäuse eines Installationsschaltgerätes.

A method according to the invention for producing a magnet system is characterized in that it comprises the following steps:

• Attaching the magnetic core to the conductor piece,
• Sliding the sleeve onto the magnetic core,
• Sliding the restraining spring onto the ram formed on the armature,
• Inserting the magnet armature with the tappet formed thereon and the restraining spring pushed thereon into the sleeve,
• - Inserting the magnetic core, conductor piece, sleeve formed with inserted magnetic core unit into the housing of a service switching device.

An inventive circuit breaker with an insulating material and a magnetic system is characterized in that on the inside of the insulating two housing members are formed at a fixed distance from each other, wherein a first bearing member for holding the conductor piece and the second bearing member are formed as a stop for the armature. The first bearing member may be formed, for example, by two spaced apart the thickness of the conductor piece side by side on the inside of the housing webs, between which the conductor piece is clamped for attachment. The second bearing member may be a shoulder on the inside of the housing, which serves as a stop for the armature, d. h., The armature can not be pushed out of the sleeve in the idle state of the restraint spring up to this stop.

According to an advantageous embodiment of the invention, the air gap of the magnet system determining distance between the magnetic core and the armature by the distance between the two bearing members is fixed. The air gap of the magnetic circuit, so the distance between the Magnetic core and the armature, is thus determined by two contact points in the housing. These bearing points can be kept in the housing exactly to each other, which has the consequence that according to the invention the air gap is tolerance independent.

Reference to the drawings, in which an embodiment of the invention is shown, the invention and further advantageous refinements and improvements of the invention will be explained and described in detail.

Show it:

1 an embodiment of a magnet system according to the invention,

2 a view of a magnet system used in a housing of a service switching device according to 1 ., such as

3 a sectional view of the inserted into a housing of a service switching device magnet system according to 1 ,

In the figures, identical or equivalent components or elements are designated by the same reference numerals.

1 shows a magnet system 1 as constructed according to the invention and in a circuit breaker 2 , please refer 2 and 3 , is used. Further details and other components of a circuit breaker, which are usually present in such, such as rear derailleur, overcurrent release, arc quenching device with arc guide rails and arc splitter stack and so on are not shown here.

The magnet system 1 has a yoke 3 , here an L-shaped metal yoke, with a long thigh 21 and an approximately right angle bent thereon short leg 22 ,

On the short thigh 22 is a conductor piece 10 welded on flat. The conductor piece 10 carries a fixed contact piece 11 and extends in extension of the short leg 22 downwards, where it ends in an approximately U-shaped curvature, which forms a Festkontaktleitschiene. The conductor piece 10 is with a first record 23 formed directly on the short leg 22 is welded. To the first record 23 is at a angle of about 45 ° projecting a second plate 24 formed, which thus runs obliquely downwards. To the second plate 24 is the U-shaped vault 25 formed.

In 2 is schematically still a contact lever 27 with a movable contact piece 28 shown, which with the fixed contact piece 11 the contact point of the circuit breaker 2 forms and of which a movable strand 29 goes out, which continues the current path in the circuit breaker inside.

The short thigh 22 and the conductor piece 10 each have a bore, which lie one above the other in welded state and thus a common passage through the conductor piece 10 and the short thigh 22 form.

Through this passage is the free end of a magnetic core 6 plugged so that it is on the outer side of the conductor piece 10 this is projected a bit far and riveted to this side by crimping.

The magnetic core consists of a ferromagnetic material and has a cylindrical outer contour and a stepped longitudinal bore 14 , The larger diameter is at the of the conductor piece 10 opposite side, the smaller diameter is located at the the conductor piece 10 facing side.

The diameter step 15 forms a stop for a cylinder spring 9 , which acts as a restraining spring. The restraining spring 9 becomes from the side of the larger diameter forth in the longitudinal bore 14 used until at the diameter step 15 comes to a stop.

A coil tube, also as a sleeve 5 designated, of insulating plastic material is from the outside over the outer surface of the magnetic core 6 pushed. So that the sleeve 5 can not slide down again, has the outer surface of the magnetic core 6 a surface contouring, such as a corrugation, which the frictional force between the outer surface of the magnetic core 6 and the inner surface of the sleeve 5 elevated. The sleeve will with a certain interference fit on the outer surface of the magnetic core 6 deferred, supported by the surface contouring and the resulting increased sliding and static friction holds the sleeve 5 then by itself on the magnetic core 5 It is not a further step to attach the sleeve 5 on the magnetic core 6 of need.

Over the outer surface of the sleeve 5 becomes the coil 4 pushed, which is flowed through by the current flowing through the circuit breaker current. Depending on the size of the rated current and the short-circuit current to be disconnected, this coil can have more or fewer turns with different cross-sections. In the example shown here, the coil has only 3 turns and a large, rectangular cross-section. It is thus suitable for switching off a large short-circuit current. The sink 4 is via a first connecting conductor 26 with the second plate 24 of the conductor piece 10 connected. Both are welded directly to each other, resulting in a low contact resistance and an overall low electrical resistance of the current path.

The first connection conductor 26 also forms an angle of about 45 ° with the first plate 23 , This oblique course of the connection conductor 26 and the second plate 24 has the following advantage. When the contact point is opened in the event of a short circuit, it is between the fixed contact piece 11 and the movable contact piece 28 an arc that initially carries the current even further over the contact point. The dashed lines 29 . 30 and the curved arrow 31 in 2 illustrate that the current path over the arc in this state takes a curved or looped course. The magnetic field associated with this looping action acts on the arc to propel it away from the pad and toward the baffles and arc splitter stack (not shown in the figures herein); It is also said that the arc is blown away, and the configuration of the first lead 26 , second plate 24 and movable contact lever 27 with strand is also called a blow loop. Due to the oblique course of the second plate 24 and the first connection conductor 26 the blown loop here has a wide opening, it creates a large Blasschleife, which is advantageous in terms of a strong blowing effect.

At the other end of the coil 4 there is a second connection conductor 33 that with a connection terminal 34 connected is.

The magnet armature 8th has a cylindrical shape, with an outer diameter. Which is sized to fit with its outer surface on the inner surface of the sleeve 5 can easily slide along without forming an oversized air gap.

At one end 17 has the magnet armature 8th a blind hole-like depression into which a pestle 7 , formed in the form of a round pin or a round rod, is pressed and then held therein without further measures for attachment, such as welding, gluing or the like, need to be provided.

Apart from the blind hole for pressing in the plunger 7 has the front of the magnet armature 8th no further surface contour. The end face thus represents in the embodiment according to the invention a smooth surface. This is advantageous because it results in a higher anchor force. Because decisive for the height of the magnetic force, the anchor force, the area in the region of the air gap and the air gap width. The inventive design results in a large anchor surface in the region of the air gap and thus in a large anchor force.

The restraining spring 9 gets over in the magnet armature 8th pressed ram 7 pushed. From the open side of the sleeve 5 The magnet armature, with the tappet, is then produced 7 ahead, into the sleeve 5 introduced. The smaller diameter is just so big that the pestle 7 that with the magnet armature 8th is connected, can slide through it. The pestle 7 thus slides through the hole 17 until it reaches the opening in the conductor piece 10 looks out a bit. The restraint spring reaches the diameter step.

The magnet armature 8th looks at the free end of the sleeve 5 a little way over the sleeve 5 out.

The width of the air gap of the magnetic circuit of the magnet system 1 is by the distance of the end face of the armature 8th from the magnetic core 6 fixable. In the case of short-circuit current tripping, the armature becomes 8th due to the magnetic force of the coil current in the sleeve 5 pulled in, and thus the plunger is driven to the left out of the sleeve and can the contact lever to open open the contact point. An advantage of the inventive design of the armature as a cylinder without further Oberflächenkonturierung is that no further air gap between the armature and the inner surface of the sleeve 5 arises when the armature in the sleeve 5 is pulled into it. If such an air gap arises, as for example in the prior art DE 198 45 476 A1 If this is the case, this reduces the anchor force. In the embodiment according to the invention, however, such an air gap does not arise.

In order to be able to comply with the width of the air gap at rest with low manufacturing tolerance, the magnet system 1 in the circuit breaker 2 used, and thereby becomes the conductor piece 10 between two at a distance of the thickness of the conductor piece side by side molded on the inside of the housing webs 34 . 35 , which together form a first bearing organ 18 form, introduced and held while a paragraph 19 , also as second bearing element 19 referred to, on the inside of the housing as a stop for the armature 8th serves. The width of the air gap is thus by the distance between two bearing elements 18 . 19 or contact points in the housing, not by parts of the magnet system itself. The contact points associated with the housing 18 . 19 can be adjusted to each other by precise housing production in an exact position and maintained with high reproducibility, whereby the air gap is independent of manufacturing tolerances of the magnet system.

Due to the foregoing description, it is clear that the magnet system according to the invention is very simple and easy to assemble. The magnet system is built up step by step on the yoke. First, the magnetic core is riveted to the yoke. The sleeve is pushed onto the magnetic core, the magnet armature with the plunger are pushed into the sleeve, the coil we pushed over it, all together is inserted into the housing. It is not necessary to produce complicated assembled subassemblies and then assemble them. But few parts are successively pushed up and pushed together, and the critical parameter of the air gap width is adjustable by a housing size, namely the set outside the magnet system distance between the two contact points for the conductor piece on the one hand and the armature on the other hand, with low tolerance.

It will be readily apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiment, and that the present invention may be embodied in other specific forms without departing from essential attributes thereof, and it is therefore desirable in that the present embodiments are considered in all respects to be illustrative and not restrictive, with reference to the appended claims, more than to the foregoing description, and it is therefore intended that all variations that come within the spirit and scope of the equivalence of claims lie, are included. LIST OF REFERENCE NUMBERS 1 magnet system 2 Circuit breaker 3 yoke 4 Kitchen sink 5 shell 6 magnetic core 7 tappet 8th armature 9 restraint spring 10 conductor piece 11 Fixed contact piece 12 first end of the sleeve 13 second end of the sleeve 14 drilling 15 Diameter step 16 blind hole-like depression 17 front 18 first bearing element 19 second bearing element 20 Insulated 21 long thigh 22 Short thigh 23 First plate 24 Second plate 25 U-shaped vault 26 First terminal block 27 contact lever 28 Movable contact piece 29 braid 30 Dashed line 31 Dashed line 32 Archery arrow 33 Second connection strip 34 web 35 web

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19845476 A1 [0004, 0044]

Claims (10)

Magnetic system ( 1 ) for a circuit breaker ( 2 ), with a yoke ( 3 ), a coil ( 4 ), a sleeve ( 5 ), a magnetic core ( 6 ), a pestle ( 7 ), a magnet armature ( 8th ) and a restraining spring ( 9 ), wherein at the yoke ( 3 ) a conductor piece ( 10 ) is formed, which is a fixed contact piece ( 11 ) and wherein the magnet armature ( 8th ) in the sleeve ( 5 ) against the power of the fetlock 9 ) is guided displaceably, characterized in that the magnetic core ( 6 ) on the conductor piece ( 10 ) is attached, that the sleeve ( 5 ) at its first end with the magnetic core ( 6 ) is in engagement, and that the magnet armature ( 8th ) at the second end of the sleeve ( 5 ) in the sleeve ( 5 ) is ein- and executable. Magnetic system ( 1 ) according to claim 1, characterized in that the magnetic core ( 6 ) one of the plunger ( 7 ) has drilled through hole. Magnetic system ( 1 ) according to claim 2, characterized in that the bore is a stepped longitudinal bore with a larger diameter at the of the conductor piece ( 10 ) facing away from the end, and that the diameter stage a first stop for the restraining spring ( 9 ). Magnetic system ( 1 ) according to claim 1, characterized in that the outer surface of the magnetic core ( 6 ) at least in the region of engagement with the sleeve ( 5 ) one the friction between the magnetic core ( 6 ) and the sleeve ( 5 ) have in this area increasing surface configuration. Magnetic system ( 1 ) according to claim 1, characterized in that the plunger ( 7 ) in a blind hole-like depression on an end face of the magnet armature ( 8th ) is inserted and fixed therein. Magnetic system ( 1 ) according to claim 3, characterized in that the end face of the magnet armature ( 8th ) the second stop for the restraint spring ( 9 ). Magnetic system ( 1 ) according to claim 1, characterized in that the magnetic core ( 6 ) with the conductor piece ( 10 ) is riveted. Method for producing a magnet system ( 1 ) according to claim 1, characterized in that it comprises the following steps: - fixing the magnetic core ( 6 ) on the conductor piece ( 10 ), - Sliding the sleeve ( 5 ) on the magnetic core ( 6 ), - pushing on the restraining spring ( 9 ) on the on the magnet armature ( 8th ) trained ram ( 7 ), - inserting the magnet armature ( 8th ) with the ram formed thereon ( 7 ) and the restrained spring ( 9 ) in the sleeve ( 5 ), - inserting the magnetic core ( 6 ), Conductor piece ( 10 ), Sleeve ( 5 ) with inserted magnetic core ( 6 ) formed unit in the housing of a service switching device. Circuit breaker ( 2 ) with an insulating material housing and with a magnet system ( 1 ) according to claim 1, characterized in that on the inside of the insulating two housing members are formed at a fixed distance from each other, wherein a first bearing member for holding the conductor piece ( 10 ) and the second bearing member as a stop for the armature ( 8th ) are formed. Circuit breaker ( 2 ) according to claim 9, characterized in that the air gap of the magnet system ( 1 ) determining distance between the magnetic core ( 6 ) and the magnet armature ( 8th ) can be fixed by the distance between the two bearing organs.

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