Axial flow pump and diagonal flow pump

• US 7,604,458 B2
• Filed: 07/22/2005
• Issued: 10/20/2009
• Est. Priority Date: 08/04/2004
• Status: Expired due to Fees

• Current Assignee: Hitachi Plant Technologies Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Plant Technologies Limited (Hitachi, Ltd.)
• Inventors: Inoue, Yasuhiro, Ishii, Takanori, Manabe, Akira, Iwano, Ryuichiro
• Primary Examiner(s): Verdier; Christopher
• Application Number:
  US11/187,082
• Publication Number:
  US 20060029495A1
• Time in Patent Office: 1,551 Days
• Field of Search: 415/191, 415193-195, 415/199.4, 415/199.5, 415/208.2, 415/209.1, 415/209.4, 415/210.1, 415/211.2, 415/218.1, 415/219.1
• US Class Current: 415/208.2
• CPC Class Codes: F04D 29/544 Blade shapes
• CPC Class Codes: F04D 29/548 Specially adapted for liquid pumps F04D29/56 takes precedence

Abstract

The guide vanes comprise two kinds of guide vanes which are alternately placed in the circumferential direction of a shroud. One kind of the guide vanes have a longer length than the other kind of the guide vanes, in the region which is close to the surface of the hub, but have substantially the same length as the other kind of the guide vanes, in the region which is close to the shroud. The leading edges of the second kind of guide vane are located further downstream in the pump axial direction than the leading edges of the first kind of guide vanes.

Claims

1. An axial flow pump comprising:

a plurality of impeller blades and a plurality of guide vanes which are fixed to a shroud and set downstream of said impeller blades, wherein

said plurality of guide vanes has plural kinds of guide vanes of which one kind of said guide vanes has a different shape from the other kind/kinds of said guide vanes, said plurality of guide vanes being regularly located in a circumferential direction of said shroud such that leading edges of said one kind of guide vanes are set further downstream than leading edges of the other kind/kinds of said guide vanes so as to reduce generation of separation vortexes due to variation in a flow rate,

said plurality of guide vanes includes two kinds of guide vanes being a first kind of guide vanes and a second kind of guide vanes such that said second kind of guide vanes are shorter than said first kind of guide vanes with respect to a said direction of a pump rotation axis and leading edges of said second kind of guide vanes are set further downstream than leading edges of said first kind of guide vanes, and

said second kind of guide vanes have a shorter length in a region close to said pump rotation axis than a length in a region farther from said pump rotation axis, said lengths being with respect to said direction of said pump rotation axis, and said second kind of guide vanes have a shorter length than said first kind of guide vanes in a region close to said pump rotation axis, said length being with respect to said direction of said pump rotation axis.

2. An axial flow pump comprising a rotation shaft, a plurality of impeller blades provided on a surface of said rotation shaft, a plurality of guide vanes which are located downstream of said impeller blades, and a shroud fixing said guide vanes on an inner circumference of the shroud, wherein

said plurality of guide vanes includes a plurality of first guide vanes and a plurality of second guide vanes;

said second guide vanes have a length, in a region close to said pump rotation shaft, shorter than a length in a region farther from said pump rotation shaft, said lengths being with respect to a direction of an axis of said pump rotation shaft, and shorter than a length of said first guide vanes, said length being with respect to said direction of said axis,

leading edges of said second guide vanes are located downstream of leading edges of said first guide vanes, in said region close to said pump rotation shaft; and

said first guide vanes and said second guide vanes are alternately located in a circumferential direction of said shroud.

3. An axial flow pump according to claim 2, wherein

said plurality of guide vanes further includes a plurality of third guide vanes,

said third guide vanes have a length shorter than a length of said first guide vanes, and longer than a length of said second guide vanes, said lengths being with respect to said direction of said axis;

and

said first, second and third guide vanes are alternately located in said circumferential direction of said shroud in a regular order.

4. A diagonal flow pump comprising a rotation shaft, a plurality of impeller blades provided on a surface of said rotation shaft, a plurality of guide vanes which are located downstream of said impeller blades, and a shroud fixing said guide vanes on an inner circumference of the shroud, wherein

said plurality of guide vanes includes a plurality of first guide vanes and a plurality of second guide vanes;

said second guide vanes have a length, in a region close to said pump rotation shaft, shorter than a length in a region farther from said pump rotation shaft, said lengths being with respect to a direction of an axis of said pump rotation shaft, and shorter than a length of said first guide vanes, said length being with respect to said direction of said axis,

leading edges of said second guide vanes are located downstream of leading edges of said first guide vanes, in said region close to said pump rotation shaft; and

said first guide vanes and said second guide vanes are alternately located in a circumferential direction of said shroud.

5. A diagonal flow pump according to claim 4, wherein

said plurality of guide vanes further includes a plurality of third guide vanes

said third guide vanes have a length shorter than a length of said first guide vanes, and longer than a length of said second guide vanes, said length being with respect to said direction of said axis;

and

said first, second and third guide vanes are alternately located in said circumferential direction of said shroud in a regular order.