JP2012245067A5 - - Google Patents

Claims (10)

A rotary blade comprising a cutting blade (3) whose cross section is bent in an arc shape and a rotary shaft (2) for supporting the cutting blade (3),
The rotating shaft body (2) includes a shaft body (4) and a plurality of disks (5) arranged in the rotating shaft direction.
The cutting blade (3) is fixed to the peripheral surface of the disk (5),
A rotary blade characterized in that a water flow generating part (8) is formed on at least a part of the disk (5).   The rotary blade according to claim 1, wherein the water flow generating part (8) is constituted by a notch formed in a peripheral part of the disk (5).   The rotary blade according to claim 1, wherein the water flow generating part (8) is constituted by a through-hole penetrating the disk (5). The disk (5) is composed of a plurality of support disks (5a) that support the cutting blade (3) and a plurality of water flow generation disks (5b) in which a water flow generation part (8) is formed,
The rotary blade according to any one of claims 1 to 3, wherein a water flow generation disk (5b) is disposed between adjacent support disks (5a, 5a).   The rotary blade according to claim 4, wherein the diameter (Rb) of the water flow generating disk (5b) is set smaller than the diameter (Ra) of the support disk (5a).   The rotary blade according to claim 4 or 5, wherein the thickness dimension (Tb) of the water flow generating disk (5b) is set larger than the thickness dimension (Ta) of the support disk (5a). The water flow generation part (8) is composed of a notch provided with a pressure generation wall (8a) on the upper side in the rotation direction and an introduction wall (8b) on the lower side in the rotation direction,
When assuming a virtual reference line (L) passing through the center of the disk (5) and the intersection of the pressure generating wall (8a) and the introduction wall (8b),
The angle (β2) sandwiched between the virtual reference line (L) and the introduction wall (8b) is set larger than the angle (β1) sandwiched between the virtual reference line (L) and the pressure generating wall (8a), The length of the introduction wall (8b) is set larger than the length of the pressure generating wall (8a),
The rotary blade according to any one of claims 2, 4, 5, and 6, wherein an introduction space (S) that facilitates introduction of water is provided facing the introduction wall (8b).   The rotary blade according to claim 7, wherein the introduction wall (8b) is formed as a flat surface. The water flow generation part (8) is composed of a notch provided with a pressure generation wall (8a) on the upper side in the rotation direction and an introduction wall (8b) on the lower side in the rotation direction,
When assuming a virtual reference line (M) passing through the center of the disk (5) and a point on the pressure generating wall (8a),
The pressure generating wall (8a) is inclined in a direction opposite to the rotational direction of the disk (5) with respect to the virtual reference line (M) around the one point on the pressure generating wall (8a). The rotary blade according to any one of 4, 5, and 6. The water flow generation part (8) is composed of a V-shaped notch including a pressure generation wall (8a) on the upper side in the rotation direction and an introduction wall (8b) on the lower side in the rotation direction, and the circumferential direction of the disk (5) Are arranged at equal intervals,
The center angle (α1) of the notch constituting the water flow generating part (8) is set smaller than the center angle (α2) of the peripheral surface of the disk (5) sandwiched between the notches. 6. The rotary blade according to claim 6.