TURBOFAN ENGINE

• US 20080000216A1
• Filed: 06/28/2006
• Published: 01/03/2008
• Est. Priority Date: 06/28/2006
• Status: Active Grant

• Current Assignee: Ishikawajima-Harima Heavy Industries Company Limited
• Original Assignee: Ishikawajima-Harima Heavy Industries Company Limited
• Inventors: Fujimura, Tetsuji, Mizuta, Ikuhisa, Imanari, Kuniyuki
• Granted Patent: US 7,721,526 B2
• Time in Patent Office: Days
• US Class Current: 60/226.1
• CPC Class Codes: F02K 3/04 the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
• CPC Class Codes: F02K 3/06 with front fan

Abstract

A turbofan engine has a fan on a front side thereof and a turbine driving the fan. The turbofan engine includes a disk rotationally driven by the turbine, a spinner detachably mounted at a front side of the disk, a spiral blade integrally mounted on a surface of the spinner, and a rear moving blade detachably mounted on an outer circumferential surface of the disk. The spiral blade and the rear moving blade form a first-stage moving blade of the fan.

Claims

1. A turbofan engine having a fan on a front side thereof and a turbine driving the fan, comprising:

a disk rotationally driven by the turbine;

a spinner detachably mounted at a front side of the disk;

a spiral blade integrally mounted on a surface of the spinner; and

a rear moving blade detachably mounted on an outer circumferential surface of the disk;

wherein the spiral blade and the rear moving blade form a first-stage moving blade of the fan.

4. A turbofan engine according to claim 1, comprising a cushioning member for sealing in a rear end edge portion of the spiral blade and in a front end edge portion close to a base of the rear moving blade.

5. A turbofan engine according to claim 1, comprising:

a first vibration interfering projection at one or more positions in the rear end portion of the spiral blade; and

a second vibration interfering projection at one or more positions at a front end portion close to a base of the rear moving blade, for colliding with the first vibration interfering projection when blade vibration occurring at the spiral blade and the rear moving blade is different therebetween.

2. A turbofan engine having a fan on a front side thereof and a turbine driving the fan, comprising:

a disk that is rotationally driven by the turbine and that has an engagement groove extending in an axial direction at a plurality of positions of an outer circumferential portion thereof;

a rear moving blade that includes a base portion having a dovetail portion extending in a front-to-rear direction, the dovetail portion being detachably fitted into the engagement groove from a front side;

a spinner detachably mounted at a front side of the disk; and

a spiral blade integrally mounted on a surface of the spinner;

wherein the spiral blade and the rear moving blade form a first-stage moving blade of the fan.

3. A turbofan engine according to claim 2, comprising a retainer integrally provided in a rear end portion of the spinner so that the dovetail portion of the rear moving blade fitted into the engagement groove from the front side is prevented from being displaced to the front side.

6. A turbofan engine according to claim 2, comprising a cushioning member for sealing in a rear end edge portion of the spiral blade and in a front end edge portion close to a base of the rear moving blade.

7. A turbofan engine according to claim 2, comprising:

a first vibration interfering projection at one or more positions in the rear end portion of the spiral blade; and

a second vibration interfering projection at one or more positions at a front end portion close to a base of the rear moving blade, for colliding with the first vibration interfering projection when blade vibration occurring at the spiral blade and the rear moving blade is different therebetween.