STRAIGHTENER

• US 3,840,051 A
• Filed: 08/14/1973
• Issued: 10/08/1974
• Est. Priority Date: 03/11/1971
• Status: Expired due to Term

• Current Assignee: Hisao Watanabe, Kenichi Koga, Koichiro Akashi
• Original Assignee: Hisao Watanabe, Kenichi Koga, Koichiro Akashi
• Inventors: Akashi, Koichiro, Watanabe, Hisao, Koga, Kenichi
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US05/388,261
• Time in Patent Office: 420 Days
• Field of Search: 138/39,40,44,37,41 73/198,25L,211
• US Class Current: 138/37
• CPC Class Codes: F15D 1/025 by means of orifice or throttle elements
• CPC Class Codes: F16L 55/02763 using an element with multiple tubes
• CPC Class Codes: G01F 1/40 Details of construction of the flow constriction devices
• CPC Class Codes: Y10T 428/12361 having aperture or cut
• CPC Class Codes: Y10T 428/24273 including aperture

Abstract

A perforated-plate type straightener adapted to be fitted in a cylindrical pipe across the passage of a fluid flowing through the pipe, comprising a perforated plate having a plurality of round holes which are the same in diameter and so provided that the distances between the adjacent holes are short in the axial center of the pipe and are gradually longer near the surrounding wall.

Claims

1. In apparatus for forming a turbulent-flow velocity distribution within a cylindrical pipe having fluid flowing therethrough, said apparatus including a perforated plate mounted within said pipe to extend transversely across the path of fluid flowing through said pipe, the improvement comprising, in combination:

means defining a plurality of cylindrical flow conduits extending through said plate in the direction of said fluid flow, said conduits being of substantially equivalent diameter and disposed in said plate with the spacing between adjacent conduits increasing progressively from the inner radial portion of said plate to the outer radial portion thereof; and

means defining the upstream ends of said conduits with a beveled configuration extending from a wider diameter to a smaller diameter taken in the direction of fluid flow;

said conduits extending downstream from said beveled configuration over the major portion of their lengths with a generally uniform diameter throughout, said uniform diameter being generally coincident with said smaller diameter of said beveled configuration.

2. Apparatus according to claim 1, wherein said perforated plate comprises a thickness dimension taken in the direction of fluid flow through said pipe, with the ratio between said thickness dimension and said uniform diameter being within the range between 1 and 3.

3. Apparatus according to claim 1, wherein said beveled configuration is in the form of frusto-conical surface.