SE178377C1

SE178377C1 -

Info

Publication number: SE178377C1
Authority: SE
Publication date: 1962-01-01

Description

Uppfinnare: G Stauber och IT Greger Prioritet begard frcin den 31 oktober 1953 (Forbundsrepubliken Tuskland) Vid elektriska apparater aro metalldelar ofta inbaddade i en elektriskt isolerande isolermassa. Sarskilt ofta inbaddas armaturdelar till elektriska apparater i en isolermassa, t. ex. anslutningsklanamor, plintar, delar av holj e-Ritter, fastskruvar, vin.kelstycken, kontaktskenor osv. En sadan inbaddning av armaturdelar i en isolermassa ar vanlig exempelvis vid med ett isolermassaskikt tackta elektriska batterier och kondensatorer, likaset vid torrmattransformatorer, mhtinstrument och dylikt, vilka aro fullstandigt inbaddade i en hardnande isolermassa. Inventors: G Stauber and IT Greger Priority requested on 31 October 1953 (Federal Republic of Tuscany) In electrical appliances, metal parts are often embedded in an electrically insulating insulating compound. Particularly often, luminaire parts for electrical appliances are embedded in an insulating compound, e.g. connecting clamps, terminals, parts of the e-Ritter housing, fastening screws, angle pieces, contact rails, etc. Such an embedding of luminaire parts in an insulating compound is common, for example, in the case of electric batteries and capacitors with an insulating mass layer, as well as in dry mat transformers, measuring instruments and the like, which are completely embedded in a hardening insulating compound.

Ph senare tid anvander man sasom elektriskt isolerande isolermassa fOretradesvis gjuthartser, enar dessa ha en utmarkt elektrisk isoleregenskap och enar de hardna utan materiella avskiljningar, dvs. I. ex. utan avskiljningar av nagra lasningsmedel eller andra flyktiga besta.ndsdelar, sa att inga blasor kunna bildas i isolermassan vid hardnandet. Gjuthartserna kunna emellertid i vissa fall ha den nackdelen, att de krympa vid hardnandet. Sarskilt om metalldelar inbaddas i en isolermassa av gjutharts, kunna pa grund ay gjuthartsets krympning spriekor uppkomma mellan gjuthartset och metalldelarna och ,darigenom orsaka otatheter. Recently, electrically insulating insulating mass has been used, preferably casting resins, these have an excellent electrical insulating property and the hard ones are united without material separations, ie. I. ex. without separations of any welding agents or other volatile constituents, so that no bubbles can form in the insulating mass during curing. However, the casting resins may in some cases have the disadvantage that they shrink upon hardening. Especially if metal parts are embedded in an insulating mass of casting resin, due to the shrinkage of the casting resin, cracks can occur between the casting resin and the metal parts and, thereby, cause leaks.

Denna olagenhet undvikes vid i en isolermassa av gjutharts inbaddade metalldelar, I. ex. armaturer, till elektriska apparater enligt foreliggande uppfinning darigenom, att metalldelarna med en dem omgivande kapsel av zinkplat aro inbaddade i isolermassan av gjutharts. Detta medfor foljande fordelar. Metalldelar av zink ha gentemot metalldelar am andra metaller den fordelen, att de sarskilt fast f5rbinda sig med gjutharts, som gjutes kring metalldelarna. Dessutom har zinkplat awn en annan fOrdel. Da hardnandet av gjut hartser genomfores yid en temperatur av c:a 100 till 150° C, blir zinkplkten mjuk vid inbaddningen i isolermassan av gjutharts, och detta har till foljd, att den vid gjuthartset fastklistrade zinkplaten kan ge efter vid det hardnande gjuthartsets krympning och att den salunda praktiskt taget icke gör nagot motstand mot det stelnande gjuthartset yid krympningen. Slutligen har zinkplat amen den fordelen gentemot andra metaller, att den dr oelastisk efter avslutandet av gjuthartsets hardningsforlopp, nar den saledes ater Sr avkyld, sa att den efter hardningsforloppet joke visar flagon tendens att aterga till det ursprungliga laget. Mellan zinkplaten och gjuthartset upptrada saledes inga dragspanningar mare sig under gjutningen eller efter stelnaudet av gjuthartskroppen. Detta Sr m.ycket fordelaktigt saval ay elektriska som ay mekaniska skill. This inertia is avoided by metal parts embedded in an insulating mass of casting resin, I. luminaires, for electrical appliances according to the present invention in that the metal parts with a capsule of zinc plate surrounding them are embedded in the insulating mass of casting resin. This has the following benefits. Metal parts of zinc have the advantage over metal parts of other metals that they are particularly firmly connected with casting resin, which is cast around the metal parts. In addition, zinc plate has another advantage. When the hardening of casting resins is carried out at a temperature of about 100 to 150 ° C, the zinc plating becomes soft when embedded in the insulating mass of casting resin, and this has the consequence that the zinc plate adhered to the casting resin can yield to the shrinkage of the curing casting resin. that it thus practically does not resist the solidifying casting resin during shrinkage. Finally, zinc plate amen has the advantage over other metals that it is inelastic after the completion of the hardening process of the casting resin, when it has thus cooled down again, so that after the hardening process it jokes shows a flagon tendency to return to the original layer. Thus, no tensile stresses occurred between the zinc plate and the casting resin during casting or after the solidification of the casting resin body. This is very advantageous for both electrical and mechanical separation.

Man liar amen redan tankt ph att i stallet for zinkplat anvanda exempelvis bly, enar amen bly har liknande mekaniska egenskaper som zinkplat. Zinkplat Sr emellertid fordelaktigare pa grund av dess ringa speeifika vikt och har dessutom en battre mekanisk stabilitet och lattare mekanisk bearbetbarhet, den later sig battre losas och den har amen en hogre smalttemperatur an bly. It is believed that lead is already used in the stable for zinc plate, for example lead, but amen lead has similar mechanical properties as zinc plate. However, zinc plate is more advantageous due to its low specific gravity and also has a better mechanical stability and easier mechanical workability, it is easier to loosen and it has a higher melting temperature than lead.

Uppfinningen skall narmare forklaras med ledning ay ett pa bifogade riffling visat exempel. Ritningen visar uppfinningens tillampning vid en elektrisk mattransformator, som visas i sektion. The invention will be explained in more detail with reference to an example shown in the accompanying rifle. The drawing shows the application of the invention to an electric mat transformer, which is shown in section.

Mattransformatorn har en. lagspanningslindning 1, en jarnkarna 2 och en hogspanningslindning 3. Delarna 1 till 3 dro inbaddade i en ay gjutharts gjuten. isolator 4. Dessutom ,aro 1 isolatorn 4 amen inbaddade de metalliska, dvs. elektriskt ledande, nipplarna 5, vilka tillsammans med skruvarna 6 tjana som 2— — armaturdelar for fastande av en bottenplatta 7 och ett lock 8 till mattransformatorn. Pa den thaliga isolatoms 4 innersida befinner sig a.ven en metallisk belaggning 9, som bildar en potentialyta for det elektriska spanningsfaltet. The mat transformer has one. layer voltage winding 1, an iron core 2 and a high voltage winding 3. Parts 1 to 3 were embedded in an ay casting resin cast. insulator 4. In addition, aro 1 insulator 4 amen embedded the metallic, ie. electrically conductive, the nipples 5, which together with the screws 6 serve as 2 luminaire parts for fastening a base plate 7 and a cover 8 to the matte transformer. On the inside of the thaliga insulator 4 there is also a metallic coating 9, which forms a potential surface for the electric voltage field.

DeIarna 1 till 9 utgOra icke foremal for uppfinningen. Enligt uppfinningen aro emellertid de metalliska armaturdelarna 5 och 6 omgivna med kapslarna 10, vilka besta av zinkplat och pa det ovan angivna sattet astadkomma en sarskilt god forbindning med isolatorns 4 gjutharts. Parts 1 to 9 do not constitute objects of the invention. According to the invention, however, the metallic luminaire parts 5 and 6 are surrounded by the capsules 10, which consist of zinc plate and in the above-mentioned manner provide a particularly good connection with the casting resin of the insulator 4.

Claims

1. Patent claim: In an insulating compound of cast resin embedded metal parts, e.g. luminaires, for electrical appliances, can be drawn & ray, that the metal parts (5 and 6) with a capsule (10) of zinc plate surrounding them are embedded in the insulating mass of casting resin (insulator 4). Request publications: Patents from Germany 625 002, 637 988. Stockholm 1962. Royal. Boktr. P. A. Norstedt & Soner. 020089