RADIAL BLOWER, ESPECIALLY FOR OIL BURNERS

• US 3,824,028 A
• Filed: 11/12/1971
• Issued: 07/16/1974
• Est. Priority Date: 11/07/1968
• Status: Expired due to Term

• Current Assignee: Franz Kozel, Heike Thomsen, Kurt Zenkner
• Original Assignee: Franz Kozel, Heike Thomsen, Kurt Zenkner
• Inventors: Zenkner, Kurt, Kozel, Franz, Thomsen, Heike
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US05/198,294
• Time in Patent Office: 977 Days
• Field of Search: 418/53,54,182,219C,204,206
• US Class Current: 415/58.6
• CPC Class Codes: F04D 29/4213 suction ports
• CPC Class Codes: F04D 29/422 Discharge tongues F04D17/04 takes precedence
• CPC Class Codes: F04D 29/4226 Fan casings

Abstract

A radial blade fan for use in connection with burners, in which a fan rotor is surrounded by a volute casing so as to form a gap therewith and has a blade exit angle of at least 90* while the volute housing has an inlet nozzle, said nozzle and the axis of said rotor being so located relative to each other that at least portions thereof are eccentrically located with regard to each other. The said volute or spiral housing has a sharp bend in the region of the beginning point of the volute or spiral from which departs on the one side the volute or spiral and on the other side a transition or connecting piece to the fan outlet.

Claims

1. A radial fan for conveying air comprising a rotor impeller having blades extending approximately radially of the rotor and a casing having axially spaced sides with a lateral inlet in one side and a spiral wall extending approximately 270* about said impeller and integral, parallel continuations of the ends of said spiral wall forming parallel walls of an outlet of said casing, said spiral wall having its first end spaced from said impeller with the spacing of said spiral wall from said impeller increasing toward the other end, said first end being joined to the corresponding parallel wall by a transition portion which is concave toward the opposite parallel wall and is joined to the first end of said spiral wall by an integral sharp bend forming a projection directed in a direction opposite to the direction of rotation of said impeller, so that the air from said impeller blades is divided into a main current out from said impeller discharged through said outlet, and another current deflected by said concave transition portion toward the periphery of said impeller into said blades, said inlet being offset relative to the axis of said impeller so that said side wall covers one circumferential portion of said impeller on one side and the inlet opening exposes a circumferential portion of said impeller on the opposite side and said inlet has a converging nozzle projecting inwardly from said side wall toward said impeller.

2. The radial fan in combination according to claim 1, wherein before the beginning of the spiral of the housing as seen in direction towards the fan outlet there is arranged a wedge-shaped nose defining together with the housing wall portion serving as transition and connecting piece a by-pass channel.

3. The radial fan in combination according to claim 2, wherein the said wedge-shaped nose is mounted pivotably about an axis parallel to the impeller axis.

4. The radial fan in combination according to claim 1, wherein the said inlet nozzle is circular in cross-section and is arranged eccentrically to the axis of the impeller.

5. The radial fan in combination according to claim 4, wherein the said inlet nozzle is staggered with respect to an exactly centrally arranged nozzle in direction towards the region in which the air leaves the impeller.