DE1588507B2

DE1588507B2 - COMBINED BIMETAL AND MAGNETIC RELEASE

Info

Publication number: DE1588507B2
Application number: DE19671588507
Authority: DE
Inventors: Heinz 2420 Eutin Marquardt
Original assignee: Licentia Patent Verwaltungs GmbH, 6000 Frankfurt
Priority date: 1967-12-12
Filing date: 1967-12-12
Publication date: 1971-06-03
Also published as: GB1234200A; DE1588507A1; AT283486B; FR1594283A

Description

1 21 2

Die Erfindung bezieht sich auf einen kombinierten bei relativ niedrigen Stromwerten an. Würde man, Bimetall- und Magnetauslöser (Schnellauslöser), bei um ein Verbrennen der Wicklung zu vermeiden, diese dem der Bimetallauslöser in wärmeleitendem Kon- Wicklung kräftiger auslegen, so ergäbe sich ein grötakt mit dem Magneteisen des Magnetauslösers steht ßerer Umfang, ein höheres Gewicht und eine höhere und indirekt durch die Erregerwicklung des Magnet- 5 Nennleistung bei Nennstrom, ohne daß die Auslöseauslösers beheizt ist, insbesondere für einen Motor- charakteristik entscheidend verändert würde. Außerschutzschalter. dem würde die mechanische Belastungsgrenze desThe invention relates to a combined at relatively low current values. Would one Bimetal and magnetic release (quick release), in order to avoid burning the winding, these which the bimetallic release in thermally conductive con-winding would be more powerful, this would result in a grötakt With the magnetic iron of the magnetic release, there is a larger circumference, a higher weight and a higher one and indirectly through the excitation winding of the solenoid 5 rated power at rated current, without the trip trigger is heated, in particular for an engine characteristic would be changed decisively. Circuit breaker. that would be the mechanical load limit of the

Während ein Schnellauslöser die Aufgabe hat, bei Bimetalls überschritten werden. Ein weiterer Nachhohen Strömen die schnelle Öffnung des zu schüt- teil dieser Bauart besteht schließlich darin, daß keine zenden Stromkreises zu bewirken, soll durch den io thermischen Auslösezeiten erreicht werden können, Bimetallauslöser die Öffnung eines zu schützenden die etwa unter einem Wert von einer Sekunde liegen. Stromkreises weit unterhalb der Ansprechstromstärke Der Erfindung liegt die Aufgabe zugrunde, einen des Schnellauslösers veranlaßt werden. in Aufbau und Fertigung einfachen und kleinen kom-While a quick release has the task of being exceeded in the case of bimetals. Another lift up After all, the rapid opening of the pouring part of this type of flow consists in the fact that none effecting the electric circuit should be able to be achieved by the thermal tripping times, Bimetal release the opening of a to be protected which are about less than a second. Circuit far below the response current strength The invention is based on the object of a of the quick release. simple and small com-

Bimetallauslöser, z. B. in Motorschutzschaltern, binierten Bimetall- und Magnetauslöser der eingangs werden beim Schutz von Motoren mit leichten An- 15 genannten Art zu schaffen, der sowohl für den Träglaufbedingungen für den Trägheitsgrad TI, bei Mo- heitsgrad TI als auch für den Trägheitsgrad TII vertoren mit schweren Anlaufbedingungen für den Trag- wendbar ist und einen möglichst geringen Bedarf an heitsgrad TII ausgelegt (VDE 0660/4.62, § 34, Ta- Heizleistung hat. Diese Aufgabe wird erfindungsfel 10). Eine derartige Forderung bedingt eine gemäß bei einem Auslöser der eingangs genannten verschiedenartige Dimensionierung des Bimetallaus- 20 Art dadurch gelöst, daß mindestens ein in seiner Lage lösers in bezug auf den Bimetallstreifen selbst und zum Magnetauslöser veränderbarer Bimetallstreifen die für die Ausbiegung des Bimetallstreifens auf- vorgesehen ist, der einerseits durch eine von diesem r zubringende Heizleistung. Da solche Bimetallschalter getragene Heizwicklung, andererseits durch die Er- '(■ einerseits flink andererseits langsam wirken sollen, regerwicklung des Magnetauslösers indirekt beheizt ist. ergeben sich verschiedene technische Ausführungen. 25 Mit einer solchen Bauart ist es möglich, eine ther-Bimetal release, e.g. B. in motor protection switches, combined bimetallic and magnetic triggers of the type mentioned at the beginning are to be created for the protection of motors with the light type, which is also used for the inertia conditions for the degree of inertia TI, for degree of inertia TI and for the degree of inertia TII severe start-up conditions for which can be applied and the lowest possible level of T II requirement is designed (VDE 0660 / 4.62, § 34, Ta heating output. This task is invented 10). Such a requirement requires a different dimensioning of the bimetallic strip for a release of the type mentioned at the beginning, in that at least one bimetallic strip which can be changed in its position with respect to the bimetallic strip itself and to the magnetic release is provided for the bend of the bimetallic strip , on the one hand by a heating power to be brought by this r. Since such bimetallic supported heating coil act on the other hand by the ER '(■ one hand nimble other hand slowly should Coil winding of the magnetic release is indirectly heated. Created by the different technical designs. 25 With such a design, it is possible to use a thermal

Ein kombinierter Bimetall- und Magnetauslöser mische Auslösung bis zu einem 25 bis 30fachen Wert der eingangs genannten Art ist durch die schweize- des Nennstromes zu erreichen. Dabei beträgt das rische Patentschrift 354 504 bekannt. Dabei trägt ein Verhältnis der Heizleistung der Heizwicklung des an seinem Ende festgelegter Bimetallstreifen an sei- Bimetallstreifens zur Heizleistung der Erregerwicknem freien, ausbiegbaren Ende einen Elektromagne- 30 lung des Magnetauslösers annähernd 0,15 zu 1. Daten, der mit dem Bimetallstreifen über einen Sehen- mit sind die Heizleistungen der Heizwicklung des kel in wärmeleitendem Kontakt steht. Eine einzige Bimetallstreifens und der Erregerwicklung des Ma-Wicklung umgibt diesen Schenkel und den anliegen- gnetauslösers so aufeinander abgestimmt, daß bis zu den Bimetallstreifen und dient sowohl zur Heizung einem etwa zweifachen Wert des von dem gesamten des Bimetallstreifens als auch zur Erregung des Ma- 35 Auslöser aufgenommenen Nennstromes die Heizgneten. Der Magnet weist einen über Scharniere be- leistung vorwiegend von der Erregerwicklung des wegbaren Anker auf, dessen freies Ende über einen Magnetauslösers aufgebracht wird und auf den BiBolzen auf einen Auslösemechanismus wirkt. Bei die- metallstreifen einwirkt. In dem darüberliegenden Beser Auslösevorrichtung dient der Bimetallstreifen zur reich bis hin zu dem Punkt einer magnetischen AusAuslösung bei Überstrom und der Elektromagnet zur 40 lösung allein durch den Magnetauslöser ist jedoch Auslösung bei Kurzschluß. Wenn der Strom bei lang- vorwiegend die von der Heizwicklung des Bimetallsamem Anstieg zu hohe Werte erreicht, biegt sich der Streifens aufgebrachte Heizleistung wirksam.
Bimetallstreifen mit dem Elektromagneten durch, so Dadurch, daß eine thermische Auslösung bis zu daß der mitgenommene Bolzen des Ankers die Aus- einem 25 bis 30fachen Wert des Nennstromes erreich- ' lösung bewirkt. Bei starkem plötzlichem Stromanstieg 45 bar ist, besteht ferner die Möglichkeit, die Größe infolge eines Kurzschlusses zieht der Anker an, und einer Vorsicherung im Vergleich zu der bekannten der mitgeführte Bolzen bewirkt die Auslösung, ohne Bauart hoch zu wählen. Eine Auslösung allein durch daß der Bimetallstreifen sich ausbiegt. Bimetalle bis hin zu derart hohen Werten des Nenn-A combined bimetallic and magnetic release with a combined release of up to 25 to 30 times the value of the type mentioned above can be achieved by the swiss rated current. The Roman patent 354 504 is known. A ratio of the heating output of the heating winding of the bimetal strip fixed at its end to the heating output of the free, flexible end of the exciter winding carries an electromagnetic trigger of approximately 0.15 to 1. with are the heating capacities of the heating winding of the kel is in thermally conductive contact. A single bimetal strip and the excitation winding of the Ma winding surrounds this leg and the adjacent gnetauslöser so coordinated that up to the bimetallic strip and serves both for heating an approximately double value of the total of the bimetal strip and for exciting the Ma- 35 Trigger the recorded nominal current the heating elements. The magnet has a hinge performance mainly from the excitation winding of the movable armature, the free end of which is attached via a magnetic release and acts on the pin with a release mechanism. When the metal strip acts. In the overlying Beser tripping device, the bimetallic strip is used to reach the point of magnetic tripping in the event of overcurrent and the electromagnet for solving solely through the magnetic release is, however, tripping in the event of a short circuit. If the current reaches values that are too high for a long time, predominantly that of the heating winding of the bimetal, the heating power applied to the strip bends effectively.
Bimetallic strips with the electromagnet through, so that a thermal release until the entrained bolt of the armature reaches a 25 to 30-fold value of the rated current causes the solution. In the event of a sudden increase in current 45 bar, there is also the possibility of the armature attracting the size as a result of a short circuit, and a back-up fuse in comparison to the known one, the carried bolt causes the trip, without choosing a high design. Triggering solely by the fact that the bimetallic strip bends. Bimetals up to such high values of the nominal

Da bei dieser Bauart der Bimetallstreifen als Trä- Stromes (etwa 30fach) bedeutet eine wirksame Entger für den Magneten dient, darf der Magnet eine 50 lastung des zugehörigen Kontaktsystems von Schaltbestimmte Größe nicht überschreiten, andernfalls arbeit, ohne in Einzelfällen einen Magnetauslöser verwürde sich der Bimetallstreifen durch das Gewicht wenden zu müssen, der ein Schaltvermögen vom Kondes Magneten durchbiegen. Ferner wird das erfah- taktsystem verlangt, das nur durch den Schnittpunkt rungsgemäß träge Verhalten eines indirekt beheizten mit einer Sicherungskennlinie begrenzt wird. Die Ver-Bimetallstreifens bei dieser bekannten Bauart in einer 55 wendung eines S-Auslösers (Magnetauslösers) kann unerwünschten Weise verstärkt. Hier muß nämlich unter Umständen eine unwirtschaftliche Auslegung die Heizwicklung zunächst das Magneteisen und den für hohes Schaltvermögen eines Motorschutzschalters von der Wicklung umschlossenen, nicht ausbiegbaren bedeuten.Since with this type of construction the bimetallic strip as a carrier current (about 30-fold) means an effective Entger is used for the magnet, the magnet may load the associated contact system of certain switching Do not exceed the size, otherwise work without using a magnetic release in individual cases to have to turn the bimetallic strip due to the weight, the switching capacity of the condens Bend magnets. Furthermore, the experience cycle system is required that only runs through the point of intersection The slow behavior of an indirectly heated with a fuse characteristic is limited. The Ver bimetal strips with this known design in a 55 turn of an S-release (magnetic release) can amplified in an undesirable manner. This is because under certain circumstances an uneconomical design must be used the heating coil, first of all, the magnetic iron and the high switching capacity of a motor protection switch mean that are enclosed by the winding and cannot be bent.

Teil des Bimetallstreifens beheizen, ehe die Wärme in Während bei der genannten bekannten Bauart derHeat part of the bimetal strip before the heat in While in the known type of construction mentioned

den ausbiegbaren Teil des Bimetallstreifens gelangen 60 Magnetauslöser zum Selbstschutz erforderlich ist, istthe bendable part of the bimetallic strip can reach 60 magnetic triggers for self-protection is required

und dort wirksam werden kann. Des weiteren können es bei der Bauart gemäß der Erfindung möglich,and can take effect there. Furthermore, it can be possible in the construction according to the invention,

indirekt beheizte Bimetalle bekanntlich nur bis zu unter Umständen auf die Magnetauslösung zu ver-As is well known, indirectly heated bimetals can only be switched to the magnetic release under certain circumstances.

einem 6 bis 8fachen Wert des Nennstromes belastet ziehten, z. B. bei Stromstufen zwischen 6 und 16 A.a 6 to 8-fold value of the rated current drawn, z. B. for current levels between 6 and 16 A.

werden; bei darüber hinausgehenden Werten würde Ferner sind bei der Bauart gemäß der Erfindung sehrwill; with values going beyond this, furthermore, in the case of the construction according to the invention, very

die Heizwicklung verbrennen. Bei der vorliegenden 65 kurze Bimetallauslösezeiten unter 1 see möglich. Esburn the heating coil. With the 65 present, short bimetal tripping times of less than 1 second are possible. It

bekannten Bauart würde in diesem Falle der korn- ist bekannt, durch Direktbeheizung des Bimetalls sehrknown design would in this case, the grain is known, by direct heating of the bimetal very

binierte Magnetauslöser ansprechen. Die Magnetaus- kurze Auslösezeiten (< 1 see) zu erreichen. Das istaddress combined magnetic releases. The magnet tripping- short tripping times (< 1 see). That is

lösung dient dabei also-als Selbstschutz und spricht aber nur oberhalb etwa 5 A Nennstrom möglich. BeiThe solution serves as self-protection and speaks only above a rated current of about 5 A. at

Claims

3 43 4

the trigger according to the invention can be a 27 of the trigger slide 23 meeting the approach 21

directly heated bimetallic strip with low support and the bimetallic strip 15 when deflected (see arrows

can also be used for current levels from 0.1 A. 28) from its rest position indicated in FIG. 4

In a further embodiment of the invention, the opposite wall of the cutouts is the magnet iron, preferably as a U-shaped profile 5 22,27 of the release slide 23, so this is formed in a rail that is adjusted on the inside of its transverse direction of an arrow 29 and actuates the leg with the base of the bimetallic strip on the other hand a thermally conductive part belonging to the trigger mechanism and is connected to the exciter winding lever 30. The rest position of the armature 14 is not surrounded by treatment. The heat influence is the cutout 22 of the release slide 23, but rather, through the magnetic release on the bimetallic release as described above, through the opening 25 of the and by relocating the fastening point of the bi-set 24 of the magnetic iron 12. An adjustment metal strip on the transverse leg of the magnetization of the release slide 23 can be changed by the bimetallic strip. With such a construction, need 15 alone has no influence on the position of the armature 14 of the making in the manufacture of triggers, since the cut-out of the current stages is only adequately dimensioned for the windings adapted to 15 22 (see F i g. 4).
The magnet iron 12 is changed via a further approach. So far, several different 31 were attached to a part fixed to the housing. For the construction of heating conductors, insulation and the position of the combined release, there is one against the types required for their attachment. It results in the approach 20 pressing screw 32, in the view of which thus a substantial standardization of the 20 pull the magnet iron 12 together with its armature 14 production. Due to the same for all current stages and the bimetallic strip 15 in the direction of the outer structure of the trigger, the same release movement of the armature 14 and the bimetallic strip manufacturing process is always used, so that a fens 15 adjusted with deformation of the approach 31 offers semi or fully automatic production . can be. The path that the anchor 14

In the drawing, an embodiment of FIG. 25 and the bimetallic strip 15 for triggering is to be carried out by the invention shown schematically. It shows running have changed.

F i g. 1 a combined bimetal and magnetic The bimetal strip 15 is on the one hand by the

trigger in one view, heating coil 16 sitting on it and the other

F i g. 2 shows a section along the line AB in FIG. 2 through the field winding 13 of the magnetic release

Fig. 1, 30 10 indirectly heated. When heated by the

F i g. 3 is a top view along the line CD in magnetic release 10, the influencing of the bi

F i g. 2, metal strip 15 not only by heat radiation

F i g. 4 the interaction of the anchor of the malleon, but also through heat conduction, because that

gnetauslösers and the bimetallic strip with a heated by the excitation winding 13 magnetic iron

Release slide in the view and in the plan view. 35 12 in thermally conductive contact with the bimetal

The trigger according to FIG. 1 and 2 is made up of stripes 15. In order to make the nimble bimetal release 11, a magnetic release 10 and a bimetal release more or less sluggish, the Belöserll is combined. The magnetic release 10 contains fastening parts 17 of the bimetal strip 15 on which a magnet iron 12 with a U-shaped cross-section, a magnet iron 12 is placed in such a way that the bimetal strip encompasses the magnet iron exciter winding 13 and 40 15 more or less an armature 14 in the U-shaped magnet iron. The bimetallic release 11 consists of 12 dips and accordingly more or less of a bimetallic strip 15 and an excitation winding 13 on this is encompassed. If z. B. in the orderly heating coil 16. The bimetallic strip 15 in FIG. 2 indicated attachment point 17 of the Biist, z. B. by spot welding, responds quickly to a fastening metal trigger 11, the more the fastening point 17 is fastened in the direction of the magnetic iron 12, the more the fastening point 17 is fastened to the transverse leg 18 of the U-shaped 45. To the attachment of a in F i g. 2 drawn arrow 33 is relocated.
To make it easier, the transverse leg 18 is provided on this. The heating winding 16 of the bimetallic strip 15 and point is provided with an impression 19. The bi- the excitation winding 13 for the magnetic release 10 metal strips 15 can thus be dimensioned within the are so that their heating capacities are matched to the magnet iron 12 and the excitation winding 13 so that the cavity formed for the bimetal bend freely. trigger 11 effective heating power at about the second

The armature 14 is at a shoulder 20 of the magnet times the nominal current of the entire trip combination

iron 12, e.g. B. in cutting, stored and is mainly carried by the excitation winding 13 of the magnet

On the other hand, an approach 21, the (Fig. 4) with its gneiauslösers 10, with a load of more than that

End in a cutout 22 of a release slide 23 55 twice the nominal current mainly from the heating coil

protrudes. The transverse leg 18 of the magnetic iron 12 goes into treatment 16 of the bimetal strip 15 is applied,

an approach 24 with an opening 25 over, which is expediently the ratio of the heating

the approach 21 of the armature 14 is penetrated and performance of the heating coil 16 of the bimetal release

limited by their length the movement of the anchor 14. 11 for the heating power of the excitation winding 13 of the

When the armature 14 is tightened, a low gnetauslösers 10 remains approximately 0.15 to 1. There-

The air gap between the armature 14 and the pole faces causes an overload of the field winding 13

of the magnetic iron 12. To stick the armature 14 of the magnetic release 10 and the heating coil 16 of the

to avoid, either the anchor 14 with a bimetallic strip 15 is effectively avoided,
non-magnetic envelope 26 or the opening 25

of the approach 24 on their stop surfaces with a 6 _S claims:

non-magnetic support. 1. Combined bimetal and magnetic release

In addition to the armature 14 or its approach 21 protrudes (quick release), in which the bimetal release

also the bimetallic strip 15 in a cutout in thermally conductive contact with the magnet

iron of the magnetic release and indirectly through the excitation winding of the magnetic release is heated, in particular for a motor protection switch, characterized in that at least one bimetal strip (15) which can be changed in its position relative to the magnetic release (10) is provided is, on the one hand by a heating coil (16) carried by this, on the other hand through the excitation winding (13) of the magnetic release (10) is indirectly heated.

2. Trigger according to claim 1, characterized in that that the ratio of the heating power of the heating coil (16) of the bimetal strip (15) to Heating output of the excitation winding (13) of the magnetic release (10) is approximately 0.15 to 1.

3. Trigger according to claim 1, characterized in that the magnet iron (12) as a U-shaped Profile rail is formed and on the inside of its transverse leg (18) with the base point of the bimetallic strip (15) (fastening point 17) connected in a thermally conductive manner and from the excitation winding (13) is surrounded.

4. Trigger according to claim 3, characterized in that the influence of heat through the Magnetic release (10) on the bimetal release (11) by relocating the fastening point (17) of the bimetallic strip (15) on the transverse leg (18) of the magnetic iron (12) can be changed.

5. Trigger according to claim 4, characterized in that the bimetal strip (15) on one raised by a stamping (indentation 19) on the transverse leg (18) of the Magnetic iron (12) is attached.

6. Trigger according to one of claims 1 to 5, characterized in that the bimetal strip (15) and the armature (14) of the magnetic release (10) execute tripping movements in the same direction.

7. Trigger according to one of claims 1 to 6, characterized in that the magnetic iron (12) carries an attachment (24) which, with an opening (25), supports the anchor (14) or an attachment (21) of the armature (14) and serves as a stop for the armature (14).

8. Trigger according to claim 7, characterized in that the armature (14) or its approach (21) with a non-magnetic envelope (26) or the opening (25) of the attachment (24) of the magnetic iron (12) is provided with a non-magnetic pad.

9. Trigger according to one of claims 1 to 8, characterized in that its setting by adjusting the magnetic release (10) can be carried out, the magnetic iron (12) via a deformable extension (31) attached to a part fixed to the housing and a fixed part Screw (32) is adjustable.

1 sheet of drawings