Topic
Bell mouth
About: Bell mouth is a research topic. Over the lifetime, 603 publications have been published within this topic receiving 1624 citations.
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Patent•
01 Mar 1977TL;DR: A tool for underwater welding comprises an open-mouthed bell with an axially extending electrode inside, part of that electrode being surrounded by a tube supplying gas under pressure from a pumping station floating on the surface as mentioned in this paper.
Abstract: A tool for underwater welding comprises an open-mouthed bell with an axially extending electrode inside, part of that electrode being surrounded by a tube supplying gas under pressure from a pumping station floating on the surface. Another tube linking the bell with that pumping station supplies water under pressure to an annular chamber open toward an array of fluid-guiding blades carried by the bell. In one embodiment, the bell is rotatably mounted and carries the blades on its outer surface, being set in rotation by the oncoming flow; in another embodiment, the bell is stationary and the blades are arranged on its inner surface whereby the water swirls in a film along that surface. In either case the circulating water forms a vortex that passes along the bell periphery and around the bell mouth which is slightly spaced from the workpiece to be welded, the resulting centrifugal forces preventing the entry of surrounding water into the bell whereby a gaseous atmosphere is maintained in its interior.
25 citations
Patent•
20 Aug 1991
TL;DR: In this article, a cooling fan is equipped with cooling fan, a fan shroud and a protecting net, which is composed of a plurality of rings and a radial grid which is disposed around the rings.
Abstract: A cooling fan apparatus has a cooling fan, a fan shroud and a protecting net. The protecting net comprises a bell mouth ring and a net portion. A bell mouth ring is disposed in front of the fan shroud through a predetermined clearance. The net portion comprises a plurality of rings and a radial grid which is disposed around the rings.
25 citations
TL;DR: In this paper, the side-branch geometries of an adaptive quarter-wave tube with a bell-mouth geometry were compared to those with a sharp edge, a backward inclined branch, and a bell mouth.
23 citations
Patent•
06 Feb 2001TL;DR: In this paper, a cooling fan is positioned behind a radiator, and an impeller is surrounded by a shroud, with an inlet and an outlet in the shape of a bell mouth, which forms a space around its front peripheral edge.
Abstract: To reduce noise caused by exhausted cooling air as well as to maintain a necessary amount of cooling air of a cooling fan. A cooling fan is positioned behind a radiator. A shroud surrounds an impeller coupled to a motor and a rotating shaft. The shroud has an inlet and an outlet in the shape of a bell mouth. The bell mouth shaped inlet has its front edge spaced from the rear surface of the radiator by a clearance D, and forms a space around its front peripheral edge. A space is formed via the space, and opens around the periphery of the shroud. The ratio A:B is 1:3 to 5, preferably approximately 1:4, where A denotes a difference between maximum and minimum diameters of the bell mouth shaped outlet of the shroud, and B notes a length of the shroud.
23 citations
Patent•
24 Nov 2006TL;DR: In this article, a multi-vane centrifugal blower with an annularly arranged vanes was described, and the impeller was provided in the fan casing with holding rings at the outer ends on the outer periphery.
Abstract: A multi-vane centrifugal blower in which a circulation flow at the axial ends of an impeller is suppressed. The blower has a scroll-type fan casing (1) with a bell mouth (4) as the air suction opening and also has the impeller of a multi-vane centrifugal type, the impeller being provided in the fan casing (1), having annularly arranged vanes (6), and blowing air, sucked from a suction opening (7) formed facing the bell mouth (4), in the centrifugal direction from between the vanes (6). Tubular bodies (11) are extended integral with holding rings (10) provided at the outer ends on the outer periphery of the impeller (2), and this suppresses a circulation flow running to the suction side at the ends of the impeller (2).
23 citations