| 摘要 |
A lamp device for underwater use comprises a sealed beam lamp (1, 3, 5) mounted in a casing (7) designed as a pressure vessel, so that the lens part (1) of the sealed beam lamp constitutes part of the pressure vessel wall in the form of a pressure vessel lid and so that the back side (5) of the sealed beam lamp having the electrical connecting means of the sealed beam lamp is within a water-tight pressure chamber. The pressure vessel casing bears against the back side of the circumferential flange (3) of the sealed beam lamp, a ring sealing means (23) placed in a groove in the casing being arranged therebetween. The flange (3) is applied against the casing (7) by means of a ring plate (19) bearing against the front side of the flange via a pressure balancing packing (27), the ring plate being releasably tightened to the casing. The pressure chamber has such dimensions that a considerable free space is obtained around the back side (5) of the sealed beam lamp, so that thermal self-convection transferring generated lamp heat to the water-cooled walls of the casing is obtained. According to a preferred embodiment, connection leads (28, 29) brought through the pressure vessel wall in a pressure and water-tight manner, are drawn along the inner side of the wall to a connector (31) from where heat-resistant leads (37, 39) are drawn to the electrical connecting means of the sealed beam lamp. The lamp device means that the weak side of the sealed beam lamp is completely protected, that a very good cooling is obtained without any particular cooling arrangement, such as cooling flanges, and that both the sealed beam lamp and connecting leads can be replaced easily. In a particular deep water embodiment, a pressure absorbing chamber filled with a liquid is arranged in front of the lens part of the sealed beam lamp.
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