EP0562469B1 - Low power capacity transformer insulated for direct contact - Google Patents

Low power capacity transformer insulated for direct contact Download PDF

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Publication number
EP0562469B1
EP0562469B1 EP93104501A EP93104501A EP0562469B1 EP 0562469 B1 EP0562469 B1 EP 0562469B1 EP 93104501 A EP93104501 A EP 93104501A EP 93104501 A EP93104501 A EP 93104501A EP 0562469 B1 EP0562469 B1 EP 0562469B1
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EP
European Patent Office
Prior art keywords
casing
low power
transformer
housing
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93104501A
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German (de)
French (fr)
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EP0562469A1 (en
Inventor
Peter Horn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knobel AG Lichttechnische Komponenten
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Knobel AG Lichttechnische Komponenten
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Publication of EP0562469A1 publication Critical patent/EP0562469A1/en
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Publication of EP0562469B1 publication Critical patent/EP0562469B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/025—Constructional details relating to cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air

Definitions

  • the invention relates to a low-power transformer insulated against contact.
  • an ignition coil which has a heat sink with cooling fins made of metal, which is inserted into a plastic housing and protrudes therefrom.
  • the invention has for its object to provide a low-power transformer insulated against contact, which does not have the disadvantages mentioned.
  • the transformer should be inexpensive to manufacture and the heat generated during operation should be easy to dissipate.
  • the plastic housing is in direct contact with the laminated core of the transformer and acts on it in a resilient manner results in very good heat transfer from the laminated core to the plastic housing. Since this has formations that enlarge the surface on its outside, the heat can be given off well to the surroundings. Since the plastic housing lies directly on the laminated core, no potting compound is required and the corresponding expensive work step not applicable. This also makes mounting the housing on the transformer particularly easy.
  • the housing preferably consists of two sleeves, which are each pushed onto the transformer from the opposite side and which snap onto the base plate of the transformer. At the point at which the two sleeves lie opposite one another, a third housing part is provided which covers the separation point. This arrangement results in a particularly simple assembly. Furthermore, transformers of different lengths can be provided with a housing with the same sleeve parts, in that only the middle part has to be made more or less wide.
  • FIG. 1 shows a low-power transformer uncut and its housing in vertical longitudinal section.
  • the laminated core 1 of the transformer can be seen, which is arranged on a base plate 4.
  • the bottom plate 4 engages on both sides in lateral grooves of the laminated core 1 and holds it together.
  • the two winding heads of the coils emerging from the end of the laminated core are covered on one side with an end cap 2 and on the other end side with one Connection cap 3, which carries the connection terminals of the transformer.
  • the housing of the transformer consists of a first sleeve 5 made of plastic and a second sleeve 6 made of plastic, which are pushed onto the laminated core 1 from the two end faces thereof.
  • the sleeves are preferably fixed to the base plate 4, as will be shown below. Between the two sleeves 5, 6, a middle housing part 7 is provided, which overlaps both sleeves.
  • a cover 8 is provided on the sleeve 5 so that there is access to the connection terminals of the transformer.
  • Figure 2 shows a vertical longitudinal section through the sleeve 6, which is provided on the outside with a plurality of cooling fins 10, which enlarge the surface of the sleeve 6 in order to dissipate the heat generated by the transformer to the environment.
  • the lower inner surface of the sleeve 6 is provided with a projection 11 which engages in a corresponding recess in the base plate 4. This enables a particularly simple assembly of the housing on the laminated core 1 and the base plate 4 by pushing the sleeve 6 onto the laminated core with the base plate from the front side until the projection 11 engages in the corresponding recess in the base plate.
  • a fastening foot 12 can also be provided on the sleeve for fastening the transformer at its place of use.
  • Figure 3 shows a vertical cross-section through the sleeve 6 along the line AA of Figure 2. Only one half of the sleeve is shown.
  • the outline of the laminated core 1 and the base plate 4 is also partially drawn. It can be seen from this that the inner surface of the plastic housing lies flat against the laminated core so that there is good heat transfer from the laminated core to the plastic housing.
  • the plastic housing is preferably made minimally smaller than the outline of the laminated core with the base plate 4. This results in a slight expansion of the sleeve when inserting the laminated core or resilient contact of the housing inner surfaces on the laminated core, ie a good contact to enable the heat flow.
  • the corner regions 13 and 14 of the housing are accordingly designed such that there is a resilient loading of the laminated core with the base plate through the housing inner surfaces 15, 16 and 17.
  • FIG. 4 shows a vertical longitudinal section through a section of the sleeve 5.
  • the projection 11 is also visible, which is intended to be snapped onto the base plate.
  • the cover 8 is shown, which gives access to the connection terminals of the transformer.
  • This cover 8 is preferably made in one piece with the sleeve 5 and connected to the sleeve by a plastic hinge.
  • the cover 8 can be designed such that it locks into place on the fixed housing when it is closed and can only be opened again by means of a tool.
  • the cover also serves as strain relief for the cables to be connected.
  • plastics for the housing different types of plastic come into consideration as plastics for the housing. Plastics that have good thermal conductivity are preferred.
  • the polyamide material PA 6 is particularly suitable.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Rectifiers (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Insulating Of Coils (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The transformer is insulated by means of a plastic housing (6) against being touched. The inner surfaces (15, 16 and 17) of the housing rest on the laminate stack (1) and the baseplate (4) of the transformer in order to produce good heat transmission from the laminate stack to the housing. The housing is provided with cooling ribs (10) on its outside, in order to dissipate the heat. The housing makes it possible to assemble the transformer quickly and easily, and produces good heat dissipation. <IMAGE>

Description

Die Erfindung betrifft einen gegen Berührung isolierten Kleinleistungstransformator gemäss Oberbegriff des Anspruchs 1.The invention relates to a low-power transformer insulated against contact.

Es ist bekannt, Kleinleistungstransformatoren, welche berührungssicher nach Klasse 2 isoliert werden müssen, in Kunststoff einzugiessen. Es ist auch bekannt, solche Transformatoren in einem Kunststoff-Gehäuse anzuordnen und die Zwischenräume zwischen Gehäuse und Transformator mit einer Vergussmasse aufzufüllen. Problematisch bei den genannten Transformatoren ist die Abfuhr der im Betrieb vom Transformator erzeugten Wärme. Ferner ist die Herstellung durch die Vergiessoperation relativ aufwendig und teuer.It is known to cast low-power transformers, which must be insulated in a class 2 manner, in plastic. It is also known to arrange such transformers in a plastic housing and to fill the spaces between the housing and the transformer with a casting compound. The problem with the transformers mentioned is the removal of the heat generated by the transformer during operation. Furthermore, the production by the casting operation is relatively complex and expensive.

Aus US-A-3 387 244 ist ein Transformator gemäss Oberbegriff bekannt, bei dem keine Massnahmen zur Kühlung getroffen sind.From US-A-3 387 244 a transformer according to the preamble is known, in which no measures for cooling are taken.

Aus GB-A-1 268 768 ist ein ölgekühlter und ölisolierter Transformator für mittlere Leistungsbereiche (50 KVA-150 KVA) bekannt, an dessen Gehäuse separate Kühlrippen angeordnet sind.From GB-A-1 268 768 an oil-cooled and oil-insulated transformer for medium power ranges (50 KVA-150 KVA) is known, on the housing of which separate cooling fins are arranged.

Aus FR-A-2 595 415 ist eine Zündspule bekannt, die einen Kühlkörper mit Kühlrippen aus Metall aufweist, der in ein Kunststoffgehäuse eingesetzt ist und aus diesem herausragt.From FR-A-2 595 415 an ignition coil is known which has a heat sink with cooling fins made of metal, which is inserted into a plastic housing and protrudes therefrom.

Der Erfindung liegt die Aufgabe zugrunde, einen gegen Berührung isolierten Kleinleistungstransformator zu schaffen, der die erwähnten Nachteile nicht aufweist. Insbesondere soll der Transformator kostengünstig herstellbar sein und die im Betrieb erzeugte Wärme soll gut abführbar sein.The invention has for its object to provide a low-power transformer insulated against contact, which does not have the disadvantages mentioned. In particular, the transformer should be inexpensive to manufacture and the heat generated during operation should be easy to dissipate.

Dies wird bei einem Kleinleistungstransformator der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspuchs 1 erreicht.This is achieved in a small power transformer of the type mentioned at the outset with the characterizing features of claim 1.

Dadurch, dass das Kunststoff-Gehäuse am Blechpaket des Transformators direkt anliegt und dieses federnd beaufschlagt, ergibt sich ein sehr guter Wärmeübergang vom Blechpaket auf das Kunststoff-Gehäuse. Da dieses an seiner Aussenseite die Oberfläche vergrössernde Ausformungen aufweist, kann die Wärme gut an die Umgebung abgegeben werden. Da das Kunststoff-Gehäuse direkt am Blechpaket anliegt, wird keine Vergussmasse benötigt und der entsprechende teure Arbeitsschritt entfällt. Dadurch wird auch die Montage des Gehäuses am Transformator besonders einfach.The fact that the plastic housing is in direct contact with the laminated core of the transformer and acts on it in a resilient manner results in very good heat transfer from the laminated core to the plastic housing. Since this has formations that enlarge the surface on its outside, the heat can be given off well to the surroundings. Since the plastic housing lies directly on the laminated core, no potting compound is required and the corresponding expensive work step not applicable. This also makes mounting the housing on the transformer particularly easy.

Vorzugsweise besteht das Gehäuse aus zwei Hülsen, welche jeweils von entgegengesetzter Seite auf den Transformator aufgeschoben werden und welche an der Bodenplatte des Transformators einschnappen. An der Stelle, an welcher sich die beiden Hülsen gegenüberliegen, wird ein dritter Gehäuseteil vorgesehen, welcher die Trennstelle überdeckt. Diese Anordnung ergibt eine besonders einfache Montage. Ferner lassen sich mit den gleichen Hülsenteilen verschieden lange Transformatoren mit einem Gehäuse versehen, indem nur der mittlere Teil mehr oder weniger breit ausgeführt werden muss.The housing preferably consists of two sleeves, which are each pushed onto the transformer from the opposite side and which snap onto the base plate of the transformer. At the point at which the two sleeves lie opposite one another, a third housing part is provided which covers the separation point. This arrangement results in a particularly simple assembly. Furthermore, transformers of different lengths can be provided with a housing with the same sleeve parts, in that only the middle part has to be made more or less wide.

Im folgenden werden Ausführungsbeispiele der Erfindung anhand der Zeichnungen näher erläutert. Dabei zeigt

  • Figur 1 schematisch einen Vertikal-Längsschnitt durch ein Gehäuse mit darin angeordnetem Transformator;
  • Figur 2 einen Vertikal-Längsschnitt durch ein hülsenförmiges Gehäuseteil;
  • Figur 3 einen Vertikal-Querschnitt durch das Hülsenteil von Figur 2, wobei nur eine Hälfte dargestellt ist und die Umrisse des Blechpaketes mit der Bodenplatte eingezeichnet sind; und
  • Figur 4 einen Vertikal-Längsschnitt durch ein zweites Hülsenteil des Gehäuses.
Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. It shows
  • Figure 1 schematically shows a vertical longitudinal section through a housing with a transformer arranged therein;
  • Figure 2 shows a vertical longitudinal section through a sleeve-shaped housing part;
  • 3 shows a vertical cross section through the sleeve part of FIG. 2, only one half being shown and the outlines of the laminated core being drawn in with the base plate; and
  • Figure 4 is a vertical longitudinal section through a second sleeve part of the housing.

Die schematische Darstellung von Figur 1 zeigt einen Kleinleistungstransformator ungeschnitten und dessen Gehäuse in Vertikal-Längsschnitt. Dabei ist das Blechpaket 1 des Transformators ersichtlich, welches an einer Bodenplatte 4 angeordnet ist. Die Bodenplatte 4 greift beidseitig in seitliche Nuten des Blechpaketes 1 ein und hält dieses zusammen. Die beiden aus dem Blechpaket stirnseitig austretenden Wickelköpfe der Spulen sind auf der einen Seite mit einer Endkappe 2 abgedeckt und auf der anderen Stirnseite mit einer Anschlusskappe 3, welche die Anschlussklemmen des Transformators trägt. Das Gehäuse des Transformators besteht aus einer ersten Hülse 5 aus Kunststoff und einer zweiten Hülse 6 aus Kunststoff, welche von den beiden Stirnseiten des Blechpaketes 1 her auf dieses aufgeschoben sind. Die Fixierung der Hülsen erfolgt dabei vorzugsweise an der Bodenplatte 4, wie nachfolgend noch gezeigt wird. Zwischen den beiden Hülsen 5, 6 ist ein mittleres Gehäuseteil 7 vorgesehen, welches beide Hülsen übergreift. An der Hülse 5 ist ein Deckel 8 vorgesehen, damit Zugriff zu den Anschlussklemmen des Transformators besteht.The schematic representation of Figure 1 shows a low-power transformer uncut and its housing in vertical longitudinal section. The laminated core 1 of the transformer can be seen, which is arranged on a base plate 4. The bottom plate 4 engages on both sides in lateral grooves of the laminated core 1 and holds it together. The two winding heads of the coils emerging from the end of the laminated core are covered on one side with an end cap 2 and on the other end side with one Connection cap 3, which carries the connection terminals of the transformer. The housing of the transformer consists of a first sleeve 5 made of plastic and a second sleeve 6 made of plastic, which are pushed onto the laminated core 1 from the two end faces thereof. The sleeves are preferably fixed to the base plate 4, as will be shown below. Between the two sleeves 5, 6, a middle housing part 7 is provided, which overlaps both sleeves. A cover 8 is provided on the sleeve 5 so that there is access to the connection terminals of the transformer.

Figur 2 zeigt einen Vertikal-Längsschnitt durch die Hülse 6, die an ihrer Aussenseite mit einer Vielzahl von Kühlrippen 10 versehen ist, welche die Oberfläche der Hülse 6 vergrössern, um die vom Transformator erzeugte Wärme an die Umgebung abzuführen. Die untere Innenfläche der Hülse 6 ist mit einem Vorsprung 11 versehen, welcher in eine entsprechende Ausnehmung der Bodenplatte 4 eingreift. Dies ermöglicht eine besonders einfache Montage des Gehäuses am Blechpaket 1 und der Bodenplatte 4, indem die Hülse 6 von der Stirnseite her auf das Blechpaket mit der Bodenplatte aufgeschoben wird, bis der Vorsprung 11 in der entsprechenden Ausnehmung der Bodenplatte einrastet. An der Hülse kann ferner ein Befestigungsfuss 12 zur Befestigung des Transformators an seinem Einsatzort vorgesehen sein.Figure 2 shows a vertical longitudinal section through the sleeve 6, which is provided on the outside with a plurality of cooling fins 10, which enlarge the surface of the sleeve 6 in order to dissipate the heat generated by the transformer to the environment. The lower inner surface of the sleeve 6 is provided with a projection 11 which engages in a corresponding recess in the base plate 4. This enables a particularly simple assembly of the housing on the laminated core 1 and the base plate 4 by pushing the sleeve 6 onto the laminated core with the base plate from the front side until the projection 11 engages in the corresponding recess in the base plate. A fastening foot 12 can also be provided on the sleeve for fastening the transformer at its place of use.

Figur 3 zeigt einen Vertikal-Querschnitt durch die Hülse 6 entlang der Linie A-A von Figur 2. Dabei ist nur die eine Hälfte der Hülse dargestellt. In der Figur 3 ist ferner der Umriss des Blechpaketes 1 und der Bodenplatte 4 teilweise eingezeichnet. Daraus ist ersichtlich, dass das Kunststoff-Gehäuse mit seinen Innenflächen flächig am Blechpaket anliegt, damit ein guter Wärmeübergang vom Blechpaket auf das Kunststoff-Gehäuse erfolgt. Das Kunststoff-Gehäuse ist dabei vorzugsweise minim kleiner ausgeführt als der Umriss des Blechpaketes mit der Bodenplatte 4. Dadurch ergibt sich ein geringfügiges Aufweiten der Hülse beim Einschieben des Blechpaketes bzw. federndes Anliegen der Gehäuseinnenflächen am Blechpaket, d.h. ein guter Kontakt zur Ermöglichung des Wärmeflusses. Die Eckbereiche 13 und 14 des Gehäuses sind dementsprechend so ausgestaltet, dass sich eine federnde Beaufschlagung des Blechpaketes mit der Bodenplatte durch die Gehäuseinnenflächen 15, 16 und 17 ergibt.Figure 3 shows a vertical cross-section through the sleeve 6 along the line AA of Figure 2. Only one half of the sleeve is shown. In Figure 3, the outline of the laminated core 1 and the base plate 4 is also partially drawn. It can be seen from this that the inner surface of the plastic housing lies flat against the laminated core so that there is good heat transfer from the laminated core to the plastic housing. The plastic housing is preferably made minimally smaller than the outline of the laminated core with the base plate 4. This results in a slight expansion of the sleeve when inserting the laminated core or resilient contact of the housing inner surfaces on the laminated core, ie a good contact to enable the heat flow. The corner regions 13 and 14 of the housing are accordingly designed such that there is a resilient loading of the laminated core with the base plate through the housing inner surfaces 15, 16 and 17.

Figur 4 zeigt einen Vertikal-Längsschnitt durch einen Abschnitt der Hülse 5. Dabei ist ebenfalls der Vorsprung 11 ersichtlich, welcher zur Einrastung an der Bodenplatte bestimmt ist. Ferner ist der Deckel 8 gezeigt, welcher Zugang zu den Anschlussklemmen des Transformators ergibt. Vorzugsweise ist dieser Deckel 8 einstückig mit der Hülse 5 ausgeführt und durch ein Kunststoff-Scharnier mit der Hülse verbunden. Der Deckel 8 kann so ausgeführt sein, dass er beim Schliessen am feststehenden Gehäuse einrastet und nur mittels Werkzeug erneut geöffnet werden kann. Vorzugsweise dient der Deckel gleichzeitig als Zugentlastung für die anzuschliessenden Kabel.FIG. 4 shows a vertical longitudinal section through a section of the sleeve 5. The projection 11 is also visible, which is intended to be snapped onto the base plate. Furthermore, the cover 8 is shown, which gives access to the connection terminals of the transformer. This cover 8 is preferably made in one piece with the sleeve 5 and connected to the sleeve by a plastic hinge. The cover 8 can be designed such that it locks into place on the fixed housing when it is closed and can only be opened again by means of a tool. Preferably, the cover also serves as strain relief for the cables to be connected.

Als Kunststoffe für das Gehäuse kommen prinzipiell verschiedene Kunststoffarten in Betracht. Bevorzugt werden Kunststoffe, welche eine gute Wärmeleitfähigkeit aufweisen. Insbesondere geeignet ist der Polyamid-Werkstoff PA 6.In principle, different types of plastic come into consideration as plastics for the housing. Plastics that have good thermal conductivity are preferred. The polyamide material PA 6 is particularly suitable.

Claims (5)

  1. Touch-protected, low power transformer fully enclosed in a plastic casing, characterized in that the plastic casing (5, 6) makes a direct surface contact with the core (1, 4) of the transformer and comprises profiles (10) on its outer surface for dissipating the heat due to the operation of the transformer, and in that the casing is shaped so that at least one inner wall (15, 16) of the casing which makes a surface contact with the core presses elastically against the same.
  2. Low power transformer according to claim 1, characterized in that the profiles are shaped as fins (10) which extend lengthwise to the casing.
  3. Low power transformer according to claim 1 or 2, characterized in that the casing comprises two shells (5, 6) pushed onto the core, and a middle section (7) placed between the shells.
  4. Low power transformer according to one of claims 1 to 3, characterized in that a ground plate (4) holding the core plates together is attached to the core (1), and that the casing comprises inner extensions (11) which grip into recesses of the ground plate.
  5. Low power transformer according to one of claims 1 to 4, characterized in that the casing comprises at least a hinge means and a lid means (8) which forms a closable opening of the casing and relieves the pull exerted on cables connected to the transformer.
EP93104501A 1992-03-26 1993-03-19 Low power capacity transformer insulated for direct contact Expired - Lifetime EP0562469B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH958/92 1992-03-26
CH958/92A CH683214A5 (en) 1992-03-26 1992-03-26 Counter contact isolated small power transformer.

Publications (2)

Publication Number Publication Date
EP0562469A1 EP0562469A1 (en) 1993-09-29
EP0562469B1 true EP0562469B1 (en) 1996-10-09

Family

ID=4199136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104501A Expired - Lifetime EP0562469B1 (en) 1992-03-26 1993-03-19 Low power capacity transformer insulated for direct contact

Country Status (5)

Country Link
EP (1) EP0562469B1 (en)
AT (1) ATE144070T1 (en)
CH (1) CH683214A5 (en)
DE (1) DE59304070D1 (en)
ES (1) ES2093300T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185811B1 (en) * 1994-08-01 2001-02-13 Hammond Manufacturing Company Method for making a transformer
DE10350617B3 (en) * 2003-10-30 2005-06-30 Vossloh-Schwabe Deutschland Gmbh Supply unit for bulbs
ES2275398B1 (en) * 2005-04-18 2008-04-01 Polylux, S.L. SMALL POWER CAPACITY TRANSFORMER AND ITS CORRESPONDING MANUFACTURING PROCEDURE.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947957A (en) * 1957-04-22 1960-08-02 Zenith Radio Corp Transformers
US3387244A (en) * 1966-05-03 1968-06-04 Hermetic Coil Co Inc Transformer having winding leads held in pressure contact with terminals
GB1268768A (en) * 1968-07-18 1972-03-29 South Wales Switchgear Housing tanks for transformers
AT304690B (en) * 1970-02-05 1973-01-25 Zumtobel Walter Transformer or induction coil
ES189797Y (en) * 1973-03-17 1974-10-16 Frater, S. A. E. PERFECTED SUPPORT FOR REACTANCES.
DE3149853C1 (en) * 1981-12-16 1983-04-07 May & Christe Gmbh, Transformatorenwerke, 6370 Oberursel Inductance or transformer with plastic moulded end covers
FR2595415A3 (en) * 1986-03-06 1987-09-11 Ducellier & Cie Magnetic circuit accommodated in the ignition coil casing for an internal combustion engine
FI78190C (en) * 1986-07-15 1989-06-12 Helvar Oy Device in a choke or in a transformer to effect the so-called cooling

Also Published As

Publication number Publication date
ES2093300T3 (en) 1996-12-16
CH683214A5 (en) 1994-01-31
DE59304070D1 (en) 1996-11-14
ATE144070T1 (en) 1996-10-15
EP0562469A1 (en) 1993-09-29

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