Mixing blade and mixing apparatus for liquids
A mixing blade comprises a first blade, at least one second blade. The first blade is spirally formed around a first shaft. The at least one second blade is twisted around a second axis parallel to the first shaft. The second blade is provided between facing blade portions in the first blade. The facing blade portions faces each other in a direction of the first shaft.
1. A mixing blade, comprising:
a first blade spirally formed around a first shaft;
at least one second blade twisted around a second axis parallel to the first shaft; and,
the at least one second blade and the second axis are each provided between facing blade portions in the first blade, and the facing blade portions facing each other in a direction of the first shaft, wherein
the first shaft has a cylindrical shape, and
the at least one second blade is entirely provided between the first shaft and an outer end of the first blade.
2. The mixing blade according to claim 1 , wherein
a plurality of the second blades are provided as the at least one second blade, and an interval between each of the second blades in a circumference of the first shaft is one time or more and less than two times a diameter of each second blade.
3. The mixing blade according to claim 2 , wherein
the first blade is wound around the first shaft by at least 5/3 turns.
4. The mixing blade according to claim 3 , wherein
the at least one second blade is twisted half a turn around the second axis.
5. The mixing blade according to claim 4 , wherein
each of the second blades are twisted in the same direction.
6. The mixing blade according to claim 4 , wherein
a number of the second blades is plural, and a direction in which each of the second blades is twisted is clockwise or counterclockwise with respect to the second axis.
7. The mixing blade according to claim 1 , wherein the at least one second blade comprises at least 36 blades which are twisted in the same direction or which include blades twisted in the clockwise direction and blades twisted in the counter-clockwise direction about the second axis.
8. The mixing blade according to claim 1 , wherein the at least one second blade is directly fixed to the first blade.
9. The mixing blade according to claim 1 , wherein a pitch of the at least one second blade is different than a pitch of the first blade.
10. A mixing apparatus, comprising:
a mixing blade, comprising:
a first blade spirally formed around a first shaft;
at least one second blade twisted around a second axis parallel to the first shaft; and
the at least one second blade and the second axis are each provided between facing blade portions in the first blade, and the facing blade portions facing each other in a direction of the first shaft; and
a housing tube housing the mixing blade, wherein
the first shaft has a cylindrical shape, and
the at least one second blade is entirely provided between the first shaft and an outer end of the first blade.
11. The mixing apparatus according to claim 10 , wherein
a ratio L/D′ of a second blade length L to an effective inner diameter D′ is 2 or more and 7 or less, the second blade length L being a length of a portion where at least one second blade is provided in a direction of the first shaft, the effective inner diameter D′ being an inner diameter obtained by subtracting a diameter of the first shaft from an inner diameter of the housing tube.
12. The mixing apparatus according to claim 10 , wherein the at least one second blade comprises at least 36 blades which are twisted in the same direction or which include blades twisted in the clockwise direction and blades twisted in the counter-clockwise direction about the second axis.
13. The mixing apparatus according to claim 10 , wherein the at least one second blade is directly fixed to the first blade.
14. The mixing apparatus according to claim 10 , wherein a pitch of the at least one second blade is different than a pitch of the first blade.