Closed impeller and method of manufacturing the same
AssigneesDaikin Industries, Ltd., Uacj Corporation
InventorsTadashi OKADA, Kosuke NISHIMURA, Kaoru UEDA, Yasunaga ITOH
Life of this patent
Estimating the term…
Abstract
A closed impeller (1) includes an impeller main body (2), which is composed of an aluminum alloy and has blades (22) that protrude from a hub (21). A shroud (3) covers the blades. The blades and the shroud are joined together by brazed joints (4). The shroud (3) is formed from a brazing sheet (30) that comprises a core material (31), which is composed of an aluminum alloy, and a filler material layer (320), which is disposed on on an outermost surface (33) of the shroud that opposes or faces the blades when the shroud is brazed to the blades.
Claims18
A closed impeller comprising:
- an impeller main body, which is composed of an aluminum alloy and comprises a hub part and blade parts that protrude from the hub part;
- a shroud, which covers the blade parts;
- and
- brazed joints, which are interposed between the blade parts and the shroud and join the blade parts and the shroud;
- wherein the shroud is a brazing sheet that comprises a core material, which is composed of an aluminum alloy, and a filler material, which is disposed on the core material and is present on an outermost surface on a side opposing the blade parts.
A closed impeller comprising:
- an impeller main body, which is composed of an aluminum material and comprises a hub part and blade parts that protrude from the hub part;
- a shroud, which is composed of an aluminum material and covers the blade parts;
- and
- brazed joints, which are interposed between the blade parts and the shroud and join the blade parts and the shroud;
- wherein the brazed joints comprise a filler material, which is composed of an aluminum alloy that contains Mg:
- 0.25 mass % or more.
A method of manufacturing a closed impeller comprising:
- an impeller main body, which is composed of an aluminum material and comprises a hub part and blade parts that protrude from the hub part;
- a shroud, which is composed of an aluminum material and covers the blade parts;
- and brazed joints, which are interposed between the blade parts and the shroud and join the blade parts and the shroud, the method comprising:
- preparing an assembly, which comprises the impeller main body, the shroud that covers the blade parts, and a filler material, which is disposed between the blade parts and the shroud;
- and
- brazing the assembly in an inert gas without using flux.
Dependencies are inferred from the claim text.