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DE2901528A1 - Cast insulator with ribs of high thermal conductivity - which are of higher density around lower density trunk and made by centrifugal casting - Google Patents

Cast insulator with ribs of high thermal conductivity - which are of higher density around lower density trunk and made by centrifugal casting

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Publication number
DE2901528A1
DE2901528A1 DE19792901528 DE2901528A DE2901528A1 DE 2901528 A1 DE2901528 A1 DE 2901528A1 DE 19792901528 DE19792901528 DE 19792901528 DE 2901528 A DE2901528 A DE 2901528A DE 2901528 A1 DE2901528 A1 DE 2901528A1
Authority
DE
Germany
Prior art keywords
ribs
insulating body
thermal conductivity
higher density
trunk
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.)
Withdrawn
Application number
DE19792901528
Other languages
German (de)
Inventor
Erich Ing Grad Silbermann
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.)
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
Priority to DE19792901528 priority Critical patent/DE2901528A1/en
Publication of DE2901528A1 publication Critical patent/DE2901528A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0423—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation
    • B29C44/043—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by density separation using a rotating mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/72—Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/006—Other inhomogeneous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0013—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0015—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0063—Density
    • B29K2995/0064—Non-uniform density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3412—Insulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Insulating Bodies (AREA)

Abstract

The insulator has a cast trunk (2) of low density and low heat capacity, and ribs (4) of insulating material of good thermal conductivity. The insulator is made by centrifugal casting. To the casting compound is added a material of higher density and greater thermal conductivity. This material is moved to the mould periphery during centrifuging and forms the ribs. The higher density material is preferably an aluminium oxide ceramic or powdered quartz. The advantage lies in ice on the ribs melting and evaporating sooner than ice around the trunk, so that a part of the insulator surface is almost always dry. Higher creep current resistance is also attained.

Description

IsolierkörperInsulating body

Die Erfindung betrifft ein Verfahren zur Herstellung eines Isolierkörpers, bestehend aus einem Strunk aus einer Gießmasse mit geringer Dichte und kleiner Wärmekapazität und Rippen aus einer Isoliermasse guter Wärmeleitfähigkeit.The invention relates to a method for producing an insulating body, consisting of a stalk made of a casting compound with low density and low heat capacity and ribs made of an insulating compound with good thermal conductivity.

Aus der DE-OS 27 08 323 ist ein Isolierkörper bekannt, der zumindest eine Oberflächenschicht aus einem Isolierwerkstoff niedriger Wärmekapazität aufweist und sich damit durch eine weitgehende Betauungsfreiheit auszeichnet. Als Werkstoffe dienen dabei vorzugsweise porige Duroplaste, beispielsweise Epoxydharz oder Silikonharz.From DE-OS 27 08 323 an insulating body is known which at least has a surface layer made of an insulating material of low heat capacity and is thus characterized by an extensive freedom from condensation. As materials Preferably porous thermosetting plastics, for example epoxy resin or silicone resin, are used.

Solche Isolierkörper können z.B. als Integralschaumstoffkörper aufgebaut sein oder Hohlkugeln als Füllstoffersatz enthalten. Besonders vorteilhaft ist es nach der DE-OS 27 08 323, den Isolierkörper in Richtung des elektrischen Potentialgradienten mit alternierenden Abschnitten unterschiedlicher Wärmeleitfähigkeit und Wärmekapazität auszubilden. Dabei können die Rippen des Isolierkörpers eine hohe Wärmeleitfähigkeit aufweisen.Such insulating bodies can, for example, be constructed as integral skin foam bodies or contain hollow spheres as a filler substitute. It is particularly beneficial after DE-OS 27 08 323, the insulating body in the direction of the electrical Potential gradients with alternating sections of different thermal conductivity and to develop heat capacity. The ribs of the insulating body can have a have high thermal conductivity.

Die Rippen sind im Verhältnis zum Strunk relativ dünn und haben damit eine geringe Wärmekapazität. Wegen der im Verhältnis zum Volumen großen Oberfläche und der guten Wärmeleitfähigkeit der Rippen erfolgt der Temperaturausgleich mit der Umgebungstemperatur im Rippenbereich schneller als im Strunkbereich. Während im Strunkbereich unter Umständen noch eine Kondensation erfolgt, beginnt im Rippenbereich mit Erreichen des Temperaturausgleichs mit der Umgebungsluft bereits die Verdunstung, so daß stets ein Anteil von nahezu trockenen Oberflächenzonen zur Sicherstellung der Isolationsfestigkeit erhalten bleibt.The ribs are relatively thin in relation to the stalk and therefore have a low heat capacity. Because of the large surface area in relation to the volume and the good thermal conductivity of the ribs means that the temperature is equalized the ambient temperature in the rib area faster than in the core area. While Condensation may still occur in the trunk area, begins in the rib area when the temperature equilibrium with the ambient air is reached, evaporation takes place, so that there is always a proportion of almost dry surface zones to ensure the insulation strength is maintained.

Aufgabe der Erfindung ist es, einen derartigen Isolierkörper mit hoher Kriechstromfestigkeit herzustellen.The object of the invention is to provide such an insulating body with high Establish tracking resistance.

Diese Aufagabe wird erfindungsgemäß dadurch gelöst, daß der Isolierkörper im Schleudergußverfahren hergestellt wird, wobei der Isolierkörper beim Gießvorgang um seine Längsachse rotiert, die Gießmasse ein Material mit höherer Dichte und besserer Wärmeleitfähigkeit als die Gießmasse enthält und das Material mit höherer Dichte in einem solchen Umfang zugegeben wird, daß es beim fertigen Isolierkörper zumindest einen Teilbereich der Rippen ausfüllt. Damit wird erreicht, daß zumindest ein Teilbereich der Rippen als Oberflächenschicht guter Wärmeleitfähigkeit ausgebildet ist, so daß der Isolierkörper, wie angestrebt, alternierende Abschnitte unterschiedlicher Wärrekapazität aufweist, was zu den eingangs genannten Vorteilen führt. Der Isolierkörper wird in einem Gießvorgang und einstückig hergestellt, was insbesondere in Bezug auf die Kriechstromfestigkeit von Vorteil ist. Bei Herstellung aus mehreren zusammengefügten Teilen wäre die Kriechstromfestigkeit an den Verbindungsstellen der Teile problematisch.This task is achieved according to the invention in that the insulating body is produced in the centrifugal casting process, the insulating body during the casting process Rotating around its longitudinal axis, the casting compound is a material with higher density and better Thermal conductivity than the casting compound contains and the material with higher density is added to such an extent that it is at least in the finished insulating body fills part of the ribs. This ensures that at least a partial area the ribs is designed as a surface layer of good thermal conductivity, so that the insulating body, as desired, alternating sections of different heat capacity has what to the initially mentioned advantages. The insulator is produced in one casting process and in one piece, which is particularly in relation on the tracking resistance is advantageous. When producing from several joined together Parts would be problematic in terms of resistance to tracking at the connection points between the parts.

Die Gießmasse kann verschäumt werden. Das ist eine besonders einfache Möglichkeit, den Isolierkörper mit geringer Wärmekapazität herzustellen.The casting compound can be foamed. This is a particularly simple one Possibility to manufacture the insulating body with low heat capacity.

Als Material höherer Dichte kann Aluminium-Oxyd-Keramik in Pulverform verwendet werden. Aluminium-Oxyd-Keramik hat eine hohe Isolationsfestigkeit und eine sehr gute Wärmeleitfähigkeit, so daß ein schneller Wärmeaustausch erfolgen kann. Alternativ kann als Material höherer Dichte Quarzmehl verwendet werden. Auch dieses Material weist eine gute Isolationsfestigkeit und eine gute Wärmeleitfähigkeit auf.Aluminum oxide ceramics in powder form can be used as a material with a higher density be used. Aluminum oxide ceramic has a high insulation strength and a very good thermal conductivity, so that a faster heat exchange takes place can. Alternatively, quartz powder can be used as the higher density material. Even this material has good insulation strength and good thermal conductivity on.

Die Erfindung wird im folgenden anhand von Ausführungsbeispielen nach den Figuren 1 und 2 näher erläutert.The invention is illustrated below with the aid of exemplary embodiments Figures 1 and 2 explained in more detail.

Die Figuren 1 und 2 zeigen Isolierkörper, die nach dem erfindungsgemäßen Verfahren hergestellt sind. Dabei stellt Fig. 1 einen Isolierkörper dar, bei dem nur die Rippen 4 aus einem Material guter Wärmeleitfähigkeit bestehen, Fig. 2 zeigt einen Isolierkörper, bei dem die gesamte Oberfläche durchgehend aus gut wärmeleitendem Material besteht. Zur Herstellung des Isolierkörpers 1 wird' einem aushärtbaren, flüssigen Gießharz ein Material mit höherer Dichte und besserer Wärmeleitfähigkeit, z.B Aluminium-Oxyd-Keramikmaterial in Pulverform oder Quarzmehl als Streckmittel beigemengt. Diese Mischung wird in eine Gußform eingefüllt. Die Gußform rotiert um die Längsachse des Isolierkörpers 1, so daß sich das beigemengte Material wegen der gegenüber dem Gießharz höheren Dichte im Oberflächenbereich des Isolators ansammelt.Figures 1 and 2 show insulating body according to the invention Process are established. 1 shows an insulating body in which only the ribs 4 consist of a material with good thermal conductivity, FIG. 2 shows an insulating body in which the entire surface is consistently made of highly thermally conductive Material. To produce the insulating body 1 is' a curable, liquid casting resin a material with a higher density and better thermal conductivity, e.g. aluminum oxide ceramic material in powder form or quartz powder as an extender added. This mixture will filled in a mold. the The mold rotates around the longitudinal axis of the insulating body 1, so that the admixed Material because of the higher density in the surface area of the compared to the cast resin Isolator accumulates.

Dabei hängt es von der Menge des zugegebenen Materials ab, ob, wie Fig. 1 zeigt, nur die Rippen 4 des Isolators oder, wie Fig. 2 zeigt, auch der Oberflächenbereich des Isolatorstrunks 5 von dem zugegebenen Material ausgefüllt wird. Die Gießmasse wird nun verschäumt und ausgehärtet, so daß der Isolatorstrunk im wesentlichen aus Schaumstoff besteht. Die Schleuderdrehzahl und die Verschäumung können so gesteuert werden, daß die Gießmasse zur Oberfläche hin verdichtet wird. Durch eine rohrförmige Oberflächenschicht höherer Dichte und damit auch größerer Stabilität kann die Umbruchfestigkeit des Isolierkörpers erhöht werden. Durch die Herstellung des Isolierkörpers in einem StUck sind Kriechströme in Grenzflächen, wie sie bei zusammengesetzten Isolierkörpern auftreten könnten, ausgeschlossen.It depends on the amount of material added whether and how FIG. 1 shows only the ribs 4 of the insulator or, as FIG. 2 shows, also the surface area of the insulator trunk 5 is filled by the added material. The casting compound is now foamed and cured, so that the insulator trunk essentially consists of Foam is made. The spin speed and the foaming can be controlled in this way that the casting compound is compacted towards the surface. Through a tubular Surface layer of higher density and thus greater stability can reduce the break resistance of the insulating body can be increased. By producing the insulating body in one Pieces are leakage currents in interfaces, as they are with composite insulating bodies could occur, excluded.

Da der Isolierkörper insgesamt eine sehr kleine Wärmekapazität aufweist, tritt auch unter ungünstigen klimatischen Verhältnissen nur eine sehr geringe Betauung auf.Since the insulating body has a very small overall heat capacity, Even under unfavorable climatic conditions, there is only very little condensation on.

Eine eventuelle Betauung wird zunächst an den Rippen des Isolierkörpers einsetzen, da diese eine gute Wärmeleitfähigkeit aufweisen und erst dann in nennenswertem Umfang im Strunkbereich auftreten, wenn im Rippenbereich bereits eine Verdunstung erfolgt. Damit bleibt stets ein bestimmter Anteil von nahezu trockenen Oberflächenzonen zur Sicherstellung der Isolationsfestigkeit erhalten.Any condensation is initially on the ribs of the insulating body use, as they have good thermal conductivity and only then to a significant extent Circumference in the trunk area occur when there is already evaporation in the rib area he follows. This means that there is always a certain proportion of almost dry surface areas to ensure the insulation strength.

4 Patentansprüche 2 Figuren Zusammenfassung Isolierkörper Die Erfindung betrifft ein Verfahren zur Herstellung eines Isolierkörpers (1), bestehend aus einem Strunk (2) aus einer Gießmasse mit geringer Dichte und kleiner Wärmekapazität und Rippen (4), bestehend aus einem Isoliermaterial guter Wärmeleitfähigkeit. Der Isolierkörper (1) wird im Schleudergußverfahren hergestellt, wobei die Gießmasse (2) ein Material (3) mit höherer Dichte und besserer Wärmeleitfähigkeit als die Gießmasse (2) enthält. Das Material höherer Dichte lagert sich beim Schleuderguß in den Außenbereichen des Isolierkörpers an. Dabei wird das Material (3) mit höherer Dichte in einem solchen Umfang zugegeben, daß es beim fertigen Isolierkörper zumindest einen Teilbereich der Rippen (4) ausfüllt. Die Rippen (4) weisen damit eine bessere Wärmeleitfähigkeit als der Isolatorstrunk (2) auf, so daß diese zuerst betauen und an den Rippen bereits die Verdunstung einsetzt, wenn der Isolatorstrunk (2) betaut. Damit bleibt stets ein bestimmter Anteil von nahezu trockenen Oberflächenzonen zur Sicherstellung der Isolationsfestigkeit erhalten.4 claims 2 figures summary Insulating body The invention relates to a method for producing an insulating body (1), consisting of from a shank (2) made from a casting compound with low density and low heat capacity and ribs (4), consisting of an insulating material with good thermal conductivity. Of the The insulating body (1) is produced in a centrifugal casting process, the casting compound (2) a material (3) with higher density and better thermal conductivity than that Contains casting compound (2). The higher density material is deposited during centrifugal casting in the outer areas of the insulator. The material (3) becomes higher Density added to such an extent that it is at least in the finished insulating body fills a portion of the ribs (4). The ribs (4) thus have a better one Thermal conductivity than the insulator trunk (2), so that these first dew and Evaporation begins on the ribs when the insulator trunk (2) condenses. This means that there is always a certain proportion of almost dry surface zones Ensuring the insulation strength is preserved.

LeerseiteBlank page

Claims (4)

Patentansprüche 1. Verfahren zur Herstellung eines Isolierkörpers, bestehend aus einem Strunk aus einer Gießmasse mit geringer Dichte und kleiner Wärmekapazität und Rippen, bestehend aus einer Isolierasse guter Wärmeleitfähigkeit, d a d u r c h g e k e n n z e i c h n e t daß der Isolierkörper (1) im Schleudergußverfahren hergestellt wird, wobei der Isolierkörper (1) beim Gießvorgang um seine Längsachse (6) rotiert, die Gießmasse (2) ein Material (3) mit höherer Dichte und besserer Wärmeleitfähigkeit als die Gießmasse (2) enthält und das Material (3) rait höherer Dichte in einem solchen Umfang zugegeben wird, daß es beim fertigen Isolierkörper zumindest einen Teilbereich der Rippen (4) ausfüllt.Claims 1. A method for producing an insulating body, consisting of a stalk made of a casting compound with low density and low heat capacity and ribs, consisting of an insulating compound with good thermal conductivity, d a d u r c h g e k e n n n z e i c h n e t that the insulating body (1) is centrifugally cast is produced, the insulating body (1) around its longitudinal axis during the casting process (6) rotates, the casting compound (2) a material (3) with a higher density and better Thermal conductivity than the casting compound (2) contains and the material (3) rait higher Density is added to such an extent that it is in the finished insulating body fills at least a portion of the ribs (4). 2. Verfahren zur Herstellung eines Isolierkörpers nach Anspruch 1, d. a d u r c h g e k e n n z e i c h n e t daß die ,Gießmasse (2) verschäumt wird.2. A method for producing an insulating body according to claim 1, d. a d u r c h e k e n n n z e i c h n e t that the, casting compound (2) is foamed. 3. Verfahren zur Herstellung eines Isolierkörpers nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h -n e t , daß als Material höherer Dichte (3) Aluminium-C)xyd-Keramals in Pulverform verwendet wird.3. A method for producing an insulating body according to claim 1 or 2, d a d u r c h e k e n n n z e i c h -n e t that as a material of higher density (3) Aluminum-C) xyd-Keramals in powder form is used. 4. Verfahren zur Herstellung eines Isolierkörpers nach den Ansprüchen 1 bis 3, d a d u r c h g e k e n n -2 e i c h n e t , daß als Material höherer Dichte (3) Quarzmehl verwendet wird.4. A method for producing an insulating body according to the claims 1 to 3, d u r c h e k e n n n -2 e i c h n e t that as a material of higher density (3) Quartz flour is used.
DE19792901528 1979-01-16 1979-01-16 Cast insulator with ribs of high thermal conductivity - which are of higher density around lower density trunk and made by centrifugal casting Withdrawn DE2901528A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792901528 DE2901528A1 (en) 1979-01-16 1979-01-16 Cast insulator with ribs of high thermal conductivity - which are of higher density around lower density trunk and made by centrifugal casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792901528 DE2901528A1 (en) 1979-01-16 1979-01-16 Cast insulator with ribs of high thermal conductivity - which are of higher density around lower density trunk and made by centrifugal casting

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DE2901528A1 true DE2901528A1 (en) 1980-07-17

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3047761A1 (en) * 1980-12-15 1982-07-15 Siemens AG, 1000 Berlin und 8000 München High voltage insulator has mineral filler exposed at surface - to minimise tendency of conducting paths to form
WO1995000310A1 (en) * 1993-06-25 1995-01-05 Ciba Sc Holding Ag Process for the manufacture of substantially hollow-cylindrical castings, and a substantially hollow-cylindrical casting
DE4437064A1 (en) * 1993-10-18 1995-04-20 Fuji Electric Co Ltd Insulator for high-voltage devices
WO2008029329A2 (en) * 2006-09-08 2008-03-13 Philips Intellectual Property & Standards Gmbh System and method for manufacturing molded structures using a high density matrix of microparticles
CN111331767A (en) * 2020-01-03 2020-06-26 天津大学 Method for manufacturing surface conductance nonlinear insulator by centrifugal technology

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3047761A1 (en) * 1980-12-15 1982-07-15 Siemens AG, 1000 Berlin und 8000 München High voltage insulator has mineral filler exposed at surface - to minimise tendency of conducting paths to form
WO1995000310A1 (en) * 1993-06-25 1995-01-05 Ciba Sc Holding Ag Process for the manufacture of substantially hollow-cylindrical castings, and a substantially hollow-cylindrical casting
DE4437064A1 (en) * 1993-10-18 1995-04-20 Fuji Electric Co Ltd Insulator for high-voltage devices
DE4437064C2 (en) * 1993-10-18 1998-11-12 Fuji Electric Co Ltd Insulator for high voltage devices and method for producing an insulator
US6040528A (en) * 1993-10-18 2000-03-21 Fuji Electric Co., Ltd. Insulating supporting structure for high-voltage apparatus including inorganic insulating layer formed on a surface of an organic insulating structure
WO2008029329A2 (en) * 2006-09-08 2008-03-13 Philips Intellectual Property & Standards Gmbh System and method for manufacturing molded structures using a high density matrix of microparticles
WO2008029329A3 (en) * 2006-09-08 2008-06-26 Philips Intellectual Property System and method for manufacturing molded structures using a high density matrix of microparticles
CN111331767A (en) * 2020-01-03 2020-06-26 天津大学 Method for manufacturing surface conductance nonlinear insulator by centrifugal technology

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