RADIAL BLOWER

• US 3,794,439 A
• Filed: 11/29/1972
• Issued: 02/26/1974
• Est. Priority Date: 12/03/1971
• Status: Expired due to Term

• Current Assignee: Dietrich E. Haase
• Original Assignee: Dietrich E. Haase
• Inventors: Haase, Dietrich E.
• Primary Examiner(s): Husar, C. J.
• Application Number:
  US05/310,473
• Time in Patent Office: 454 Days
• Field of Search: 415/53,54
• US Class Current: 415/53.2
• CPC Class Codes: F04D 17/04 of transverse-flow type
• CPC Class Codes: F04D 29/4226 Fan casings

Abstract

A radial blower has an impeller with a radially vaned rim rotatably mounted in a housing adjacent a discharge conduit. The portions of the housing on both sides of the discharge conduit incline outwardly away from the impeller to form wedge-shaped inlet and discharge chambers on both sides of the impeller. The larger ends of the suction and discharge chambers are joined by a return or bypass channel which directs the main portion of flow away from the back into the impeller. The portion of the impeller between the suction and discharge chambers is bordered by a concavely curved flow diverting element having a radius of curvature slightly smaller than the impeller and a maximum distance at its mid-section, which is substantially equal to the radial length of the vanes on the rim of the impeller. An inlet or suction opening in the front wall of the housing is eccentrically disposed relative to the impeller and adjacent the inlet chamber. The inlet conduit is inclined toward the suction chamber. A set of curved deflectors is disposed substantially parallel to each other in the central chamber of the housing within the impeller vanes and substantially in line with the discharge chamber and conduit and having tip ends fairly close to the inner ends of the impeller vanes of the discharge conduit.

Claims

1. A radial blower comprising a housing having a curved periphery, an impeller having a radially vaned rim, shaft and bearing means rotatably mounting said impeller within said housing, said housing also having a front wall disposed adjacent a vaned side of said impeller, a suction opening in said front wall eccentrically disposed relative to said impeller, a discharge conduit in the portion of said periphery near said suction opening, the portion of said periphery in the direction of rotation of said impeller away from said discharge conduit deviating outwardly from a nozzle section disposed substantially adjacent to said impeller at said discharge conduit into a wedgeshaped inlet pressure chamber of increasing cross-sectional area, the portion of said periphery on the side of said discharge conduit opposite to said nozzle approaching inwardly Toward said impeller in the direction of rotation of said impeller to form a wedge-shaped discharge chamber, a curved return channel connecting the wider ends of said inlet and discharge chambers for conducting the main portion of pumped fluid from said inlet chamber to said discharge chamber whereby it is directed back into said impeller, the portion of said impeller disposed opposite said discharge conduit and between said suction and discharge chambers having a concavely curved bordering element disposed adjacent said impeller and bridging the portion of said impeller disposed between said inlet and discharge chambers and said return channel, and said concavely curved bordering element having a curvature constructed and arranged to divert flow between it and said impeller inwardly between said vanes of said impeller.

2. A radial blower as set forth in claim 1 wherein said concavely curved bordering element has a radius of curvature slightly smaller than the radius of curvature of said impeller.

3. A radial blower as set forth in claim 2 wherein said concavely curved bordering element has a mid-sectional maximum spacing from said impeller substantially similar to the radial length of said vanes.

4. A radial blower as set forth in claim 1 wherein the portion of said housing within said vanes comprises a central chamber, deflector vanes projecting from said front wall and being disposed in said central chamber substantially parallel to the line of flow through said discharge chamber and said discharge conduit whereby fluid currents circulating within said central chamber are directed into said discharge conduit.

5. A radial blower as set forth in claim 1 wherein said impeller vanes and said deflector vanes have portions adjacent said discharge conduit disposed near to each other.

6. A radial blower as set forth in claim 4 wherein said deflector vanes are slightly curved.

7. A radial blower as set forth in claim 6 wherein said deflector vanes are disposed substantially parallel to each other and have substantially similar radii of curvature.

8. A radial blower as set forth in claim 1 wherein a suction conduit is connected to said suction opening on said front wall of said housing and said suction conduit being inclined toward said inlet chamber whereby it directs suction fluid into said inlet chamber.

9. A radial blower as set forth in claim 8 wherein a curved elbow section is connected to said inclined suction conduit, and said curved elbow section has a portion remote from said inclined section which is disposed substantially parallel to the axis of rotation of said impeller.

10. A radial blower as set forth in claim 1 wherein said housing comprises a substantially elliptical outer casing, said impeller being disposed at one end of said elliptical casing, said return channel being disposed at the other end of said elliptical outer casing, and said concavely curved bordering wall and the inside wall of said return conduit comprising a concavoconvex baffle disposed within said casing with its concave wall facing said impeller.

11. A radial blower as set forth in claim 1 wherein said vanes are slightly curved.

12. A radial blower as set forth in claim 11 wherein said vanes slightly curve outwardly forward.