Combined fan blade structure and air outlet device
The combined fan blade structure includes: an inner hub, an outer hub, a first blade set, and a second blade set. The outer hub and the inner hub are coaxially arranged, the first blade set is connected to an outer peripheral surface of the outer hub, the second blade set is located between the inner hub and the outer hub, and the outer hub blocks the second blade set.
1 . A combined fan blade structure, comprising:
an inner hub;
an outer hub coaxially arranged with the inner hub and arranged around the inner hub;
a first blade set connected to an outer peripheral surface of the outer hub, wherein the first blade set comprises a plurality of first blades, and the plurality of first blades are distributed at intervals in a circumferential direction of the outer hub; and
a second blade set connected between the inner hub and the outer hub, wherein the second blade set comprises a plurality of second blades, the plurality of second blades are distributed at intervals in a circumferential direction of the inner hub, and the outer hub blocks sides of the second blades facing the outer hub,
wherein the outer hub has a radially inner surface and a radially outer surface inclined in a direction away from a rotation axis of the inner hub in an air outlet direction, the radially inner surface and the radially outer surface are nonparallel.
2 . The combined fan blade structure according to claim 1 , wherein the first blades comprise axial flow blades or oblique flow blades, and/or the second blades comprise centrifugal blades.
3 . The combined fan blade structure according to claim 1 , wherein the first blades are axial flow blades, and projections of adjacent first blades in a plane perpendicular to an axial direction are spaced in the circumferential direction of the outer hub;
or, the first blades are oblique flow blades, and projections of adjacent first blades in a plane perpendicular to an axial direction have overlapping areas in the circumferential direction of the outer hub.
4 . The combined fan blade structure according to claim 1 , wherein the inner hub is inclined in a direction away from a rotation axis of the inner hub in an air outlet direction.
5 . The combined fan blade structure according to claim 1 , wherein the inner hub has an opening facing an air outlet side.
6 . The combined fan blade structure according to claim 1 , wherein the inner hub comprises a first air guide portion and a second air guide portion connected to each other, the first air guide portion is located on an air inlet side of the inner hub, the second air guide portion is arranged opposite the outer hub in a radial direction of the outer hub, and the second blades are connected to the second air guide portion.
7 . The combined fan blade structure according to claim 6 , wherein the first air guide portion and/or the second air guide portion are inclined in a direction away from a rotation axis of the inner hub in an air outlet direction.
8 . The combined fan blade structure according to claim 6 , wherein an acute angle between the first air guide portion and the second air guide portion and a rotation axis of the inner hub gradually decreases in an air outlet direction.
9 . The combined fan blade structure according to claim 6 , wherein the first air guide portion is axially higher than an air inlet side of the outer hub.
10 . The combined fan blade structure according to claim 1 , wherein a distance between adjacent second blades in an inner circumferential direction of the outer hub is smaller than a distance between adjacent first blades in an outer circumferential direction of the outer hub.
11 . The combined fan blade structure according to claim 1 , wherein a hub ratio of the inner hub to the second blades is smaller than a hub ratio of the outer hub to the first blades.
12 . An air outlet device, comprising:
the combined fan blade structure according to claim 1 ;
an air deflector provided with an air inlet and an air outlet at both ends, wherein the air deflector has an air guide cavity inside, the air inlet and the air outlet are both communicated with the air guide cavity, and the combined fan blade structure is accommodated in the air guide cavity and coaxially arranged with the air deflector; and
a power element connected to one end of the inner hub close to the air outlet and configured to drive the inner hub to rotate.
13 . The air outlet device according to claim 12 , further comprising a mounting seat and a plurality of guide vanes, wherein the mounting seat and the plurality of guide vanes are all accommodated in the air deflector, the mounting seat and the air deflector are coaxially arranged, one end of the power element connected to the inner hub passes through the mounting seat, the plurality of guide vanes are arranged around an outer periphery of the mounting seat, and the guide vanes are connected between the air deflector and the mounting seat.
14 . The air outlet device according to claim 13 , wherein an outer wall of the mounting seat is located radially inward of an inner wall of the outer hub at one end adjacent to the air outlet.
15 . The air outlet device according to claim 13 , wherein the mounting seat comprises a first connecting part, a second connecting part, and a transition part, the first connecting part is perpendicular to a rotation axis of the inner hub, the second connecting part is arranged around an outer periphery of the first connecting part, the transition part is connected between the first connecting part and the second connecting part, and the transition part is inclined away from the rotation axis of the inner hub in an air outlet direction.