Dual-direction mixing impeller

Patent metadata

Field	Value
Publication number	US-2016339402-A1
Application number	US-201514718860-A
Country	US
Kind code	A1
Filing date	May 21, 2015
Priority date	May 21, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

An impeller, which may be a dual-direction mixing impeller, may include a hub and a blade extending from the hub, the blade having a substantially flat root portion and a twisted outer portion, the blade terminating at the twisted outer portion.

First claim

What is claimed is:

1 . A dual-direction mixing impeller comprising:
a hub; and a blade extending from the hub, the blade having a substantially flat root portion and a twisted outer portion, the blade terminating at the twisted outer portion.

2 . The impeller of claim 1 , further comprising a plurality of the blades, each of the blades extending radially from a rotational axis of the hub.

3 . The impeller of claim 1 , wherein the blade is selected from one of constant thickness along its length, and varying thickness along its length.

4 . The impeller of claim 1 , wherein the blade is symmetric about a centerline along its length.

5 . The impeller of claim 1 , wherein chord lengths are constant along a length of the blade.

6 . The impeller of claim 5 , wherein a ratio of chord length to blade length is 1:6.

7 . The impeller of claim 1 , wherein the blade is attached at a base of the root portion to the hub.

8 . The impeller of claim 7 , wherein the root portion is oriented at an angle of between 30° and 45° to an axis of rotation of the impeller.

9 . The impeller of claim 8 , wherein the root portion is oriented at an angle of 45° to the axis of rotation of the impeller.

10 . The impeller of claim 1 , wherein the twisted outer portion is attached directly to the root portion.

11 . The impeller of claim 10 , wherein the root portion extends one-half a length of the blade; and the twisted outer portion extends one-half the length of the blade.

12 . The impeller of claim 1 , wherein a shape of the twisted outer portion is selected from a helicoid and a doubly ruled hyperbolic paraboloid.

13 . The impeller of claim 1 , wherein the twisted outer portion terminates in a tip oriented at an angle of between 90° and 135° to the root portion.

14 . The impeller of claim 13 , wherein the outer portion terminates in the tip oriented at an angle of 90°.

15 . The impeller of claim 14 , wherein the tip is squared off.

16 . The impeller of claim 15 , wherein the tip is squared off at a right angle to a centerline of the blade.

17 . A mixing impeller comprising:
a hub having a central axis of rotation; and a pair of blades extending radially from opposing sides of the hub, each of the blades having a substantially flat root portion and a twisted outer portion, the blade terminating at the twisted outer portion.

18 . The impeller of claim 17 , wherein each of the pair of blades is attached at a base of the root portion to the hub; and the twisted outer portion is attached directly to the root portion.

19 . A method of making a mixing impeller, the method comprising:
forming a hub having a central axis of rotation; forming a pair of blades, each of the blades having a substantially flat root portion, a twisted outer portion, and terminating at the twisted outer portion, and the twisted outer portion is attached directly to the root portion; and attaching the pair of blades to the hub, the blades extending radially from opposing sides of the hub, wherein each of the pair of blades is attached at a base of the root portion to the hub.

20 . The method of claim 19 , wherein forming a pair of blades comprises forming each blade of the pair of blades from a single rectangular plate; and forming each twisted outer portion by twisting the outer portion of the rectangular plate to have a shape selected from a helicoid and a doubly ruled hyperbolic paraboloid.

Assignees

• Nat Oilwell Varco Lp

Inventors

• Janz Eric Edward Antonio
• Myers Kevin J

Classifications

• B01F7/00341 Primary

  Operations & Transport · mapped topic

• B01F2215/0422

  Numerical values of angles · CPC title

• B01F2215/0431

  Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof · CPC title

• B01F27/113 Primary

  Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller · CPC title