Vacuum bulb, circuit-breaker pole including such a vacuum bulb, and method to manufacture such devices

摘要

A vacuum bulb is provided, including a sealed chamber; two electrical contacts, which move relative to one another, the chamber including a cylindrical body of a dielectric material and closed at ends thereof by two metal covers, each of the two metal covers being connected to one of the two electrical contacts: and a dielectric coating, which covers an outer surface of the chamber, and includes at least two layers, including an overmolding layer of a synthetic material and an intermediate layer of silicone, the intermediate layer being interposed between the outer surface and the overmolding layer, the intermediate layer being discontinuous and localized on metal portions of the chamber so as to cover at least partially an outer surface of the metal portions, and the silicone includes compressible hollow bodies having a skin of a thermoplastic material.

主权项

1. A vacuum bulb, comprising:
a sealed chamber; two electrical contacts, which move relative to one another,
wherein the sealed chamber includes a cylindrical body made of a dielectric material and closed at ends thereof by two metal covers,wherein each of the two metal covers is connected to one of the two electrical contacts; and a dielectric coating, which covers an outer surface of the sealed chamber,
wherein the dielectric coating includes at least two layers, including an overmoulding layer made of a synthetic material and an intermediate layer made of silicone,
wherein the intermediate layer is interposed between the outer surface of the sealed chamber and the overmoulding layer,wherein the intermediate layer is discontinuous and localised in direct contact with at least a portion of each of the two metal covers, so as to cover at least partially an outer surface of the two metal covers, andwherein the silicone of the intermediate layer includes hollow bodies that are compressible and have a skin made of a thermoplastic material.