DE7500135U - Electric capacitor - Google Patents

Description

PATENT LAWYERS '..': · ..::. D 59 victories

DIPL-ING. ERICH SCHUBERT Marburger Tor 2 ■ P.O. Box

DIPL-ING. ROLF PÜRCKHAUER ^{telephone; (0271) 5407} °

Telegram address: Patschub, Siegen

75 011 κα / Α. ₃

British Insulated Callender's Cables Limited, 21 Bloomsbury Street, London WClB 3QN, England

This application claims priority from British advance notification no. 975/7 ¹ I claimed from 9 January 1974. '

Electric capacitor

The innovation relates to electrical capacitors with pressure-tight containers and in particular (but not exclusively) on capacitors that are used in main circuits, e.g. in circuits that supply fluorescent lamps or electric motors, be used.

Under certain fault conditions, discharges can occur within the capacitor container and / or the capacitor can overheat, and the resulting increase in pressure may leakage of impregnating agent (in the case of capacitors made with insulating liquids or low-melting Solids are impregnated) or even cause an explosion of the capacitor.

In order to avoid damage that occurs in this way, it has already been proposed that the container of the condenser be so to train that it is capable of a controlled expansion, for example by molding annular waves or annular folds in an end wall or a peripheral wall so that when developing a

Overpressure, a section of the container "moves relative to another part of the same, this movement being used to actuate a cut-off device that disconnects the capacitor from the associated circuit"

In a known embodiment of this type, the In the QB-PS 1 351 290 (DT-OBM 7 219 804) is described, the Capacitor has a capacitance element that is in a tubular shape Sleeve included 1st and of which at least one of your electrodes is connected to a corresponding contact, which is connected to a holding member is rigidly seated, which In its position In the Sleeve is secured between the element and one end of the sleeve. A mating contact rigidly attached to a locking component at this end of the sleeve is connected to an external connection or an external terminal. In the wall of the tubular sleeve there are circumferential corrugations between the holding component and the locking component, and the contact and the mating contact act together to substantially prevent relative rotation of the locking members and the retaining member and between the Electrodes and the outer terminal to establish a separable electrical connection, which is achieved by separating the contact and the Counter-contact when opening the corrugations as a result of excessive Pressure in the sleeve is interrupted.

The innovation is based on the task of establishing contact and counter-contact without sacrificing their effectiveness and To simplify operational reliability and to enable a more economical production, this arrangement of contact and Mating contact in the capacitor according to GB-PS 1 351 290 and can certainly also be used in other similar capacitors.

A capacitor according to the innovation has a cylindrical sleeve with circumferential corrugations in its circumferential wall, which Divide the sleeve into two sections that move apart when overpressure occurs. A capacity element

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sitting \ n of the sleeve and 1st connected to a first of the two sections, with one of its Elekcroden with a contact in the form of 1st connected a rod which is held rigidly with respect to the first portion of the sleeve and axially towards the second portion thereof protrudes; Furthermore, a mating contact in the form of a wire is provided, which is firmly wound on the rod and connected to an external connection or an external terminal on the second section of the sleeve, so that the mating contact is used in the event that the sections of the sleeve move away from each other of wound wire is pulled axially away from the rod to separate the electrode from the connector

The mating contact will normally only be connected to the outer terminal at one end, namely by a normal catfish one-piece extension; normally the connection should be made at the end that is from the free end of the rod further away, otherwise the danger. there is that the wound mating contact rather elongates or increases under the tensile stress. winds up than slides cleanly from the rod "

The rod can have any suitable cross-section, but are sharp-angled rods such as those for conventional ones electrical wrapped wire connections are not used, too recommend as they usually require excessive force to pull off the wire-wound mating contact. Quality Results have been obtained with a rod in the form of a short length of relatively strong round wire that is a one-piece Extension of a vein can be that connects the rod with the respective Electrode connects.

Usually, but not necessarily, both or all of the electrodes of the capacitor will be separable with the one described Contact device provided. It should of course be appropriate Steps are taken to isolate the contacts and mating contacts and establish unwanted connections either between elec-

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to prevent the capacitor from tripping or indirectly from a contact after its mating contact.

The or each contact rod can be in any convenient one Be kept wise; for example, in some cases the first section of the sleeve containing the capacitance element and filling the base of the or each rod with a hardening potting compound; however, preferably the or everyone will Rod held by a retaining component which is fastened between the capacitance element and the corrugations, for example by that it becomes wedged therebetween when the corrugations are formed between the element and an open end of the sleeve will. The corrugations can be squeezed together to complete the fastening process and to increase the capacity for relative outward movement of the two sections.

The mating contact can be formed in place with a conventional wire winding tool, normally before connecting to the external connections. In a preferred embodiment, the outer connections are tubular, and the mating contact is provided with a protruding tail portion which is threaded through the outer terminal when the sleeve is assembled around the element and is then sealed and electrically connected to it, for example by soldering or crimping. The first section of the sleeve is preferably closed at the end, and the external connections are attached to a separate locking disc which is inserted into the other end of the sleeve.

The innovation will now be described with reference to the drawing which shows, for example, a section through reproduces a capacitor according to the innovation.

The capacitance element 1 is tubular, and its ends are protected by insulating caps 2, 3. Round copper

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wires Ί, 5 are connected to the electrodes and run through Recesses in an insulating holder 6 through to protrude as rods 7, 8 beyond this; they are immediate cranked below the bracket 6 in order to secure it mechanically against upward movement relative to the bracket. This component group is held in the lower (first) section of the sleeve 9 by the lowest of three axially compressed corrugations 10, which give the upper (second) portion of the sleeve, which has the closure component 11, the possibility of relative to Move bracket 6 upward under positive pressure conditions.

On each of the rods 7, 8, a wire 12 is firmly wound in closed screw turns, which is in one piece on his The lower end is connected to a wire 13 which is connected to the outer terminals IM without any significant slack. A discharge resistor 15 is provided.

If an overpressure occurs that is sufficient to open To cause the corrugations 10, the coiled wire 12 is pulled from the end of each rod 7 * 8, so that the circuit is interrupted.

Protection claims

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Claims (5)

- 6 - 75 Oil Kü / A protection claims 1. An electrical capacitor consisting of a cylindrical sleeve with Umfangswellungen in their Umf angswaiid _t is this divided into two sections which move away from each other upon the occurrence of an overpressure of a capacitance element is seated in the sleeve and secured to a first of the two sections is, wherein a contact is connected to one of the electrodes of the element, which is held rigidly with respect to the first section, and wherein a mating contact is connected to an external connection on the second section of the sleeve, such that when the sections of the sleeve are moved apart the mating contact is pulled away from the contact in order to separate the electrode from the connection, characterized in that the contact is in the form of a rod (7, 8) which projects axially towards the second section of the sleeve (9), and that the counter-contact is designed in the form of a wire (12) which is wound tightly onto the rod. 2. Capacitor according to claim 1, characterized in that the mating contact with the outer terminal (IM) by an integral extension of that end of the wound wire (12) is connected, which is further away from the free end of the rod (7,8). 3. Capacitor according to claim 1 or 2, characterized in that the rod (7,8) is a short length of a round wire (4,5) 1st which is strong relative to the wound wire (12). 4. Capacitor according to claim 3 »characterized in that the rod (7,8) is formed in one piece with a wire which connects the rod (7,8) to the electrode. 7500135 04/30/75 - T- 5. Capacitor according to one of claims 1 to 4, characterized characterized in that the first portion of the sleeve (9) which contains the Kapa ^ itätselement (1), and the base of the rod (7,8) are filled with a hardening potting compound to hold the rod (7,8). 7500135 04/30/75