CH656251A5 - Process for the production of an extinguishing chamber for an electrical fluid switch - Google Patents
Process for the production of an extinguishing chamber for an electrical fluid switch Download PDFInfo
- Publication number
- CH656251A5 CH656251A5 CH312082A CH312082A CH656251A5 CH 656251 A5 CH656251 A5 CH 656251A5 CH 312082 A CH312082 A CH 312082A CH 312082 A CH312082 A CH 312082A CH 656251 A5 CH656251 A5 CH 656251A5
- Authority
- CH
- Switzerland
- Prior art keywords
- casting
- resin
- production
- mold
- electrical
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0222—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould the curing continuing after removal from the mould
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- 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
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
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- 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
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
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- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
-
- 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
- B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
-
- 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
- B29L2031/3443—Switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A casting resin composition comprising equal parts by weight of an epoxy-containing resin with curing agent, a quartz sand having a maximum particle size of 10 mu m, and a quartz sand having a particle size of from 30 to 80 mu m is prepared and introduced, in the pressure gelling process, into a mould whose cavity corresponds to the extinguishing chamber. The finished extinguishing chamber, when used as a constituent exposed to switch arcs, has both good mechanical properties and good electrical properties.
Description
**WARNUNG** Anfang DESC Feld konnte Ende CLMS uberlappen **.
PATENTANSPRÜCHE
1. Verfahren zum Herstellen einer Löschkammer für einen elektrischen Flüssigkeitsschalter aus einem mit einem mineralischen Füllstoff gemagerten, wärmehärtbaren Kunststoff, dadurch gekennzeichnet, dass im wesentlichen gleiche Gewichtsanteile eines Epoxy-Gruppen aufweisenden Harzes mit Härter, eines Quarzmehles mit einer Korngrösse von höchstens 10 llm und eines Quarzmehls mit einer Korngrösse von 30 bis 80 llm zu einer Giessharzmasse vermengt werden, und diese nach dem Druckgelierverfahren in eine Form eingebracht wird, deren Formhohlraum der Löschkammer entspricht.
2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass ein hochreaktives, cycloaliphatische Gruppen aufweisendes Epoxy-Harz verwendet wird.
3. Verfahren nach Patentanspruch 2, dadurch gekennzeichnet, dass die Form auf 140-145 "C vorgewärmt wird, dass die Raumtemperatur aufweisende Giessharzmasse unter einem Giessdruck von 2-3 b- in die Form eingebracht und danach während 10-15 Minuten vorgehärtet wird, wonach der Giessling entformt und bei einer Temperatur von 140 "C während 10 Stunden nachgehärtet wird.
4. Verfahren nach Patentanspruch 3, dadurch gekennzeichnet, dass der Giessdruck während der Vorhärtezeit aufrechterhalten wird.
5. Nach dem Verfahren gemäss Patentanspruch 1 hergestellte Löschkammer.
Die Erfindung betrifft ein Verfahren zum Herstellen einer Löschkammer gemäss dem Oberbegriff des Patentanspruches 1.
Aus der CH-PS 424887 und ihrem Zusatz 453447 ist es bekannt, Isolationsteile für elektrische Schaltgeräte, insbesondere solche, die der Wirkung von Schaltlichtbögen ausgesetzt sind, aus wärmehärtbaren Harzen herzustellen, die gegebenenfalls mit körnigen, mineralischen Füllstoffen, wie Rutil, Glimmer, Quarzmehl, Gesteinsmehl, Aluminiumoxydtrihydrat, Kalziumcarbonat, gemahlener Dolomit, Gips oder Bariumsulfat gemagert sind und/oder fasrige Füllstoffe, wie Glas-, Polyester-, Polyacrilnitril- oder Baumwollfasern oder -Gewebe enthalten. Es hat sich indessen gezeigt, dass sofern nur körnige Füllstoffe verwendet werden, die Herstellung durch herkömmliches Giessen zwar möglich ist, aber im Ergebnis waren entweder die mechanischen oder aber die elektrischen Eigenschaften des so hergestellten Isolationsteiles unbefriedigend.
Wird ein fasriger Füllstoff verwendet, ist die Herstellung der Isolationsteile durch Giessen erheblich erschwert wenn nicht gar (bei Geweben) unmöglich.
Andererseits ist in der CH-PS 458464 beschrieben, welche Fraktionen des mineralischen Füllstoffes bezüglich Korngrösse und in welchen Mengen diese Fraktionen einem wärmehärtbaren Harz zuzusetzen sind, um eine Verguss- oder Einkapselungsmasse zu erhalten, die bezüglich thermischem Ausdehnungskoeffizienten möglichst den thermischen Ausdehnungskoeffizienten der umgossenen Metallteile (aus Kupfer, Aluminium und/oder Eisen) ähnlich ist, um bei thermischer Wechselbeanspruchung die Rissbildung in der ausgehärteten Verguss- oder Einkapselungsmasse zu vermeiden.
Da bei einem umgossenen Schaltungsteil die Einkapselungsmasse kein selbsttragendes Element ist, und auch nicht plötzlichen Wärmeeinwirkungen wie z.B. einem Schaltlichtbogen ausgesetzt ist, gibt die CH-PS 458 464keinen Hinweis darauf, welche Korngrössen in welchen Mengen dem wärmehärtbaren Kunststoff zuzusetzen sind, um selbsttragenden elektrischen Isolierteilen - wie die Löschkammer eines elektrischen Flüssigkeitsschalters eines ist - eine zufriedenstellende elektrische und mechanische Festigkeit zu verleihen und zugleich die Herstellung zu vereinfachen.
Es ist daher ein Zweck der Erfindung, ein Verfahren der eingangs genannten Art vorzuschlagen, das zu einer sowohl bezüglich mechanischer als auch bezüglich elektrischer Eigenschaften befriedigenden Löschkammer führt und zudem mit einem Mindestmass an bezüglich Korngrössen verschiedenen Fraktionen des Füllstoffes auskommt, so dass die Herstellung bedeutend vereinfacht wird.
Das vorgeschlagene Verfahren besteht aus den im kennzeichnenden Teil des Patentanspruches 1 definierten Schritten.
Die Grundzüge des Druckgelierverfahrens sind beispielsweise im SEV-Bulletin 63 (1972) 22, Seite 1300, Ziffer 2 beschrieben. Bei diesem Verfahren, das bisher noch nicht zur Herstellung von Löschkammern angewendet wurde, kann vor allem die Bildung von Lunkern infolge des Schwindens des Giessharzes während der Aushärtung vermieden werden, und zugleich kann die Vorhärtezeit (d.h. die Wartezeit, bis die Entformung des Giesslings möglich ist) gegenüber dem herkömmlichen Giessverfahren erheblich gekürzt werden.
Die erfindungsgemäss zubereitete Giessharzmasse zeigt bei der Verarbeitung keine Sedimentationserscheinungen des Quarzmehls und ist ausreichend dünnflüssig um ohne weiteres in die Form eingebracht zu werden. Obwohl der Harzanteil in der Giessharzmasse gewichtsmässig nur einen Drittel ausmacht, ist die Verteilung des Füllstoffes in der fertigen Löschkammer sehr homogen, was auf das Druckgelieren zurückzuführen ist. Da bezüglich Korngrösse nur zwei wohl definierte Fraktionen Quarzmehl und dies erst noch zu gleichen Gewichtsanteilen benötigt werden, ist die Aufbereitung der Giessharzmasse besonders einfach.
** WARNING ** beginning of DESC field could overlap end of CLMS **.
PATENT CLAIMS
1. A method for producing a quenching chamber for an electrical liquid switch from a heat-curable plastic which is leaned with a mineral filler, characterized in that substantially equal parts by weight of a resin containing epoxy groups with hardener, a quartz flour with a grain size of at most 10 llm and one Quartz flour with a grain size of 30 to 80 llm are mixed into a casting resin mass, and this is introduced into a mold according to the pressure gelation process, the mold cavity of which corresponds to the arcing chamber.
2. The method according to claim 1, characterized in that a highly reactive, cycloaliphatic group-containing epoxy resin is used.
3. The method according to claim 2, characterized in that the mold is preheated to 140-145 "C., that the casting resin composition having room temperature is introduced into the mold under a casting pressure of 2-3 b- and then pre-hardened for 10-15 minutes, after which the casting is demolded and post-cured at a temperature of 140 "C for 10 hours.
4. The method according to claim 3, characterized in that the casting pressure is maintained during the pre-hardening time.
5. Extinguishing chamber produced by the method according to claim 1.
The invention relates to a method for producing an arcing chamber according to the preamble of claim 1.
From CH-PS 424887 and its addition 453447 it is known to produce insulation parts for electrical switching devices, in particular those which are exposed to the action of switching arcs, from thermosetting resins, which may contain granular, mineral fillers such as rutile, mica, quartz powder, Rock flour, aluminum oxide trihydrate, calcium carbonate, ground dolomite, gypsum or barium sulfate are lean and / or contain fibrous fillers such as glass, polyester, polyacrylonitrile or cotton fibers or fabrics. However, it has been shown that if only granular fillers are used, production by conventional casting is possible, but as a result either the mechanical or the electrical properties of the insulation part produced in this way were unsatisfactory.
If a fibrous filler is used, the production of the insulation parts by casting is considerably more difficult if not impossible (for fabrics).
On the other hand, CH-PS 458464 describes which fractions of the mineral filler are to be added to a thermosetting resin with regard to grain size and in what amounts, in order to obtain a casting or encapsulation compound which, as far as possible, has the thermal expansion coefficient of the cast metal parts with regard to thermal expansion coefficient ( made of copper, aluminum and / or iron) is similar, in order to avoid the formation of cracks in the hardened casting or encapsulation compound in the case of alternating thermal stress.
Since the encapsulation mass is not a self-supporting element in a molded circuit part, and also not sudden heat effects such as e.g. is exposed to a switching arc, the CH-PS 458 464 gives no indication of which grain sizes and in what quantities are to be added to the thermosetting plastic in order to give self-supporting electrical insulating parts - such as the quenching chamber of an electrical liquid switch - satisfactory electrical and mechanical strength and at the same time to simplify production.
It is therefore a purpose of the invention to propose a method of the type mentioned at the outset which leads to a quenching chamber which is satisfactory both in terms of mechanical and electrical properties and also manages with a minimum of different fractions of the filler with respect to grain sizes, so that production is significantly simplified becomes.
The proposed method consists of the steps defined in the characterizing part of claim 1.
The basic principles of the pressure gelling process are described, for example, in SEV Bulletin 63 (1972) 22, page 1300, number 2. With this method, which has not yet been used for the production of quenching chambers, the formation of voids due to the shrinkage of the casting resin during curing can be avoided, and at the same time the pre-curing time (ie the waiting time until the casting can be removed from the mold) ) can be significantly reduced compared to the conventional casting process.
The cast resin composition prepared according to the invention shows no signs of sedimentation of the quartz powder during processing and is sufficiently thin to be easily introduced into the mold. Although the proportion of resin in the casting resin mass is only a third by weight, the distribution of the filler in the finished quenching chamber is very homogeneous, which is due to the pressure gelling. Since only two well-defined fractions of quartz powder are required in terms of grain size and this is still required in equal parts by weight, the preparation of the casting resin mass is particularly simple.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH312082A CH656251A5 (en) | 1982-05-19 | 1982-05-19 | Process for the production of an extinguishing chamber for an electrical fluid switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH312082A CH656251A5 (en) | 1982-05-19 | 1982-05-19 | Process for the production of an extinguishing chamber for an electrical fluid switch |
Publications (1)
Publication Number | Publication Date |
---|---|
CH656251A5 true CH656251A5 (en) | 1986-06-13 |
Family
ID=4249037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH312082A CH656251A5 (en) | 1982-05-19 | 1982-05-19 | Process for the production of an extinguishing chamber for an electrical fluid switch |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH656251A5 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0361109A1 (en) * | 1988-09-09 | 1990-04-04 | Mitsubishi Chemical Corporation | Resin composition |
-
1982
- 1982-05-19 CH CH312082A patent/CH656251A5/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0361109A1 (en) * | 1988-09-09 | 1990-04-04 | Mitsubishi Chemical Corporation | Resin composition |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PFA | Name/firm changed |
Owner name: SPRECHER ENERGIE AG |
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PL | Patent ceased |