ELECTRIC BLOWER

PURPOSE:To reduce the weight of an impeller and to improve blast efficiency by a method wherein a plurality of blades are held between the nip formed by front and rear shrouds to form an impeller, and a fold edge making contact with the inner end part of the blade is formed to the port edge of the i...

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Bibliographic Details
Main Authors YAMAURA IZUMI, HASHIMOTO MASAMI
Format Patent
LanguageEnglish
Published 09.03.1990
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
NON-POSITIVE DISPLACEMENT PUMPS
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
WEAPONS
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Summary:PURPOSE:To reduce the weight of an impeller and to improve blast efficiency by a method wherein a plurality of blades are held between the nip formed by front and rear shrouds to form an impeller, and a fold edge making contact with the inner end part of the blade is formed to the port edge of the intake air port of the front shroud. CONSTITUTION:An impeller is formed with a plurality of blades 25, a front shroud 31 provided at its central part with an intake air port 31a, and a rear shroud 32 to integrally form them by means of caulked parts 33. The edge of the intake air port 31a of the front shroud 31 is folded toward the motor side to form a fold line 31b, which is brought into contact with the inner end surface of the blade 25. Thereby, since the blade 25 is functioned as reinforcement for a centrifugal force, strength is improved sharply. Since strength is improved, even when caulked parts 33 are reduced from three parts to two parts per one blade 25, there is no problem on strength, and efficiency can be improved.
Bibliography:Application Number: JP19880224234