DE910435C - Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device - Google Patents

Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device

Info

Publication number
DE910435C
DE910435C DES12807D DES0012807D DE910435C DE 910435 C DE910435 C DE 910435C DE S12807 D DES12807 D DE S12807D DE S0012807 D DES0012807 D DE S0012807D DE 910435 C DE910435 C DE 910435C
Authority
DE
Germany
Prior art keywords
ceramic body
explosion
housing
screwed
pressure
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
Application number
DES12807D
Other languages
German (de)
Inventor
Willi Nerlich
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 AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Priority to DES12807D priority Critical patent/DE910435C/en
Application granted granted Critical
Publication of DE910435C publication Critical patent/DE910435C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H01B17/301—Sealing of insulators to support

Landscapes

  • Insulators (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von druckfesten Leitungsdurchführungen für explosionsgeschützte Geräte unter Verwendung eines in das Gehäuse des Gerätes einzuschraubenden keramischen Körpers. Um eine explosionsdichte Verbindung zwischen dem Gehäuse des Gerätes und dem keramischen Körper zu erzielen, mußten die Gewindegänge des keramischen Körpers auf Maß geschliffen werden. Diese Herstellung des Gewindes ist sehr teuer. Dazu kommt, daß die keramischen Gewinde sehr empfindlich sind, so däß die Gefahr von Beschädigungen bei der Montage wie beim Transport groß ist.The invention relates to a method for producing pressure-resistant Cable bushings for explosion-proof devices using an in the housing of the device to be screwed in ceramic body. To an explosion-proof To achieve a connection between the housing of the device and the ceramic body, the threads of the ceramic body had to be ground to size. These Manufacture of the thread is very expensive. In addition, the ceramic thread are very sensitive, so there is a risk of damage during assembly such as is large during transport.

Man hat nun versucht, auf dem keramischen Körper ein Metallgewinde dadurch aufzubringen, daß ein metallischer Gewindering auf den keramischen Körper aufgesickt wurde. Dieses Verfahren ist jedoch ebenfalls teuer und erfordert eine große Genauigkeit von keramischem Körper und Gewindering. Es hat auch eine unerwünscht lange Ausführung des Körpers zur Folge, die sich dann besonders nachteilig auswirkt, wenn man aus Platzgründen bemüht sein muß, die Leitungsdurchführung so kurz wie möglich zu halten.Attempts have now been made to create a metal thread on the ceramic body to be applied in that a metallic threaded ring on the ceramic body was embroidered. However, this method is also expensive and requires one great accuracy of ceramic body and threaded ring. It also has an undesirable effect result in long execution of the body, which then has a particularly disadvantageous effect, if you have to strive for reasons of space, the cable bushing as short as possible to keep.

Man hat ferner versucht, ein Metallgewinde durch Umgießen des keramischen Körpers aufzubringen. Hierfür konnten jedoch nur Metalle mit niedrigstem Schmelzpunkt verwendet werden. Dabei entstand, abgesehen von den fabrikatorischen Schwierigkeiten, sehr @-iel Ausschuß ; außerdem haben solche Metalle nicht die für den Explosionsschutz notwendige hohe Festigkeit.Attempts have also been made to create a metal thread by casting around the ceramic Body. However, only metals with the lowest melting point could do this be used. Apart from the manufacturing difficulties, very @ -iel scrap; in addition, such metals do not have those for explosion protection necessary high strength.

Alle diese Nachteile werden dadurch vermieden, däß der keramische Körper, der beispielsweise aus Steatit, also einem möglichst festen keramischen Stoff besteht, mit einer zähen und harten Zinklegierung nach dem Spritzgußverfahren unter hohem Druck umspritzt wird. Hierbei ist es nur nötig, den- keramischen Körper genügend stark vorzuwärmen, um einen zu großen Wärmeabzug des eingespritzten Metalles und ein Zerspringen des keramischen Körpers zu vermeiden. Ein nachträgliches Aufschneiden des Gewindes ist nicht erförderlich, da das Gewinde bereits in der Form mit vorgesehen wird und mit großer Genauigkeit entsteht. Der Körper kann nach dem Spritzvorgang gebrauchsfertig aus der Form herausgedreht werden.All these disadvantages are avoided by the fact that the ceramic Body made, for example, of steatite, i.e. a ceramic that is as strong as possible Fabric consists of a tough and hard zinc alloy after the injection molding process is encapsulated under high pressure. Here it is only necessary to remove the ceramic body preheat enough to avoid excessive heat dissipation from the injected metal and to avoid cracking of the ceramic body. Subsequent slicing of the thread is not necessary because the thread is already provided in the form and is created with great accuracy. The body can after the spraying process can be twisted out of the mold ready for use.

In der Zeichnung ist i der keramische Körper und z der das Gewinde enthaltende Körper aus Zinkspritzguß. Ein zuverlässiger Sitz des aufgespritzten Metallkörpers sowie eine Sicherung gegen Drehen und Abstreifen wird dadurch erreicht; daß der keramische Körper am Umfang Ausnehmungen erhält, die wie bei g in der Achsrichtung oder wie bei 4 senkrecht dazu verlaufen und die vorn Zinkspritzguß ausgefüllt werden.In the drawing, i is the ceramic body and z is the thread containing bodies made of die-cast zinc. A reliable fit of the sprayed on Metal body and a safeguard against turning and stripping is achieved; that the ceramic body receives recesses on the circumference, which as in g in the axial direction or run perpendicular to it as at 4 and fill in the zinc injection molding at the front.

Claims (1)

PATENTANSPRUCH: Verfahren zum Herstellen von druckfesten Leitungsdurchführungen für explosionsgeschützte Geräte unter Verwendung eines in das Gehäuse des Gerätes einzuschraubenden keramischen Körpers, dadurch gekennzeichnet, daß das Gewinde auf dem keramischen Körper durch eine zähe und harte Zinklegierung nach dem Spritzgußverfahren unter hohem Druck hergestellt wird.PATENT CLAIM: Process for the production of pressure-tight cable penetrations for explosion-proof devices using an in the housing of the device Ceramic body to be screwed in, characterized in that the thread is on the ceramic body through a tough and hard zinc alloy after the injection molding process is produced under high pressure.
DES12807D 1942-03-29 1942-03-29 Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device Expired DE910435C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES12807D DE910435C (en) 1942-03-29 1942-03-29 Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES12807D DE910435C (en) 1942-03-29 1942-03-29 Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device

Publications (1)

Publication Number Publication Date
DE910435C true DE910435C (en) 1954-05-03

Family

ID=7474110

Family Applications (1)

Application Number Title Priority Date Filing Date
DES12807D Expired DE910435C (en) 1942-03-29 1942-03-29 Process for the production of pressure-resistant cable bushings for explosion-proof devices using a ceramic body to be screwed into the housing of the device

Country Status (1)

Country Link
DE (1) DE910435C (en)

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