JP3039406B2 - Propeller fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller fan having a hollow blade, and more particularly to a structure of such a blade.

[0002]

2. Description of the Related Art In FIGS. 8 and 9, a plurality of blades 52 having an aerofoil shape are arranged at a predetermined pitch in a circumferential direction on an outer peripheral surface of a boss 51 which is driven to rotate. The conventional general propeller fan 50 is shown.

[0003] The wing 52 has a united joint structure comprising a wing body 53 and a lid 54, which are molded from a resin material and are described below.

[0004] The wing body 53 is provided with a leading edge 5 of the wing 52.
The thickness is gradually reduced from a portion corresponding to 2a to a portion corresponding to the rear edge portion 52b, and a concave portion 56 is formed on one side surface 53a. Further, a joining shelf surface 57 is formed on the outer peripheral edge of the concave portion 56.

[0005] The lid 54 is fitted and arranged so as to cover the concave portion 56 of the wing main body 53 so as to cover the concave portion 56, and is fixedly joined thereto, and together with one side surface 53a of the wing main body 53, the wing surface of the wing 52. And have substantially the same thickness over the entire area. And this lid 5
4 is fitted into the concave portion 56 of the wing main body 53, and these are joined together by ultrasonic bonding at a portion corresponding to the shelf surface 57, thereby forming the concave portion 56 therein. A wing 52 having a hollow portion 58 is formed.

[0006] The above-mentioned wing 52 constructed as described above is shown in FIG.
As shown in FIG. 5, the front edge 52a of the boss 51 is directed forward in the rotation direction of the boss 51, and the lid 54 is positioned on the negative pressure side.
The boss 51 is provided with a predetermined blade mounting angle so as to gradually retreat from the front edge portion 52a side to the rear edge portion 52b side when viewed from the lid 54 side in one axial direction. In this case, the wing main body 53 may be formed integrally with the boss 51, or may be formed separately from the boss 51 and assembled later to the boss 51.

[0007]

By the way, in the propeller fan 50 having the wings 52 having such a configuration,
When this is operated, centrifugal force acts on the wing 52, and the wing 5
2 is its front edge 52a bending force in a direction to retract it in the side F _1, also at the trailing edge 52b side bending force F ₂ in the direction of advancing the which acts respectively.

In this case, especially on the leading edge 52a side, the inclination angle (different from the blade mounting angle) with respect to the axis of the boss 51 is the largest, and the unit mass of the blade 52 is also the shape of the aerofoil. before since edge 52a side is largest, a front edge 52a moreover maximum bending force F ₁ acts on the corner portion a of the edge 52a and the rear edge 52b before located fan radially outer periphery Te Will do.

However, as described above, when the lid 54 has substantially the same thickness as a whole and its bending rigidity is set relatively high, and when the wing body 53 and the lid 54 are compared, towards the vane body 53 is from undergoing a greater bending force increases its mass than the lid 54, the front edge 5 the blade 52 is subjected to the bending force F ₁
When the 2a side bends in the retreating direction, the wing body 53
The lid 54 stretches against the bending deformation of the wing body 53 and acts in a direction to suppress the deformation. As a result, a peeling action occurs at the joint portion 55 between the wing body 53 and the lid 54, and for example, ultrasonic bonding is performed. 8, the wing body 53 separates from the lid 54 and bends as shown by a dashed line in FIG. 8 (see reference numeral 53 '), so that the propeller fan 50 can maintain its performance or operate. Is not preferred in terms of ensuring the reliability of

Therefore, in order to maintain the performance of the propeller fan 50 and to ensure the reliability in operation, the wing body 53 and the lid 5 are required.
4 is reduced as much as possible, and the wing main body 53 is provided even if separation occurs.
It is necessary to prevent separation and scattering between the cover and the cover 54. However, no effective means from this point of view has yet been proposed.

Accordingly, the present invention has been made for the purpose of maintaining the performance of a propeller fan and ensuring the reliability in operation.

[0012]

Means for Solving the Problems In the present invention, the following configuration is adopted as specific means for solving such problems.

In the first invention of the present application, the wing body 10 having a wing shape on the outer peripheral surface of the boss 2 that is rotationally driven and having a concave portion 11 provided on one side surface 10a, and the wing body 10 A plurality of wings 3, 3,... Comprising a lid 20 which covers the recess 11 and is joined to the recess 11 so as to form a cavity 7 between the recess 11 and The wing 3 has a predetermined wing mounting angle so that the wing 3 gradually recedes from the front edge 3a located on the front side in the rotation direction toward the rear edge 3b located on the rear side when viewed from the lid 20 side in the rotation axis direction. In the propeller fan provided, the plate thickness of the lid 20 is set so that the portion of the wing 3 located closer to the front edge 3a is thinner than the portion located closer to the rear edge 3b. And

In the second invention of the present application, the wing body 10 having a wing shape on the outer peripheral surface of the boss 2 driven to rotate and having a concave portion 11 on one side surface 10a, and the wing body 10 A plurality of wings 3, 3,... Comprising a lid 20 which covers the recess 11 and is joined to the recess 11 so as to form a cavity 7 between the recess 11 and The wing 3 has a predetermined wing mounting angle so that the wing 3 gradually recedes from the front edge 3a located on the front side in the rotation direction toward the rear edge 3b located on the rear side when viewed from the lid 20 side in the rotation axis direction. In the propeller fan provided, the wing body 10
Receiving portions 12 and 14 which are recessed in the surface direction of the wing 3 on at least one of the outer peripheral wall portion 11a of the concave portion 11 and the outer peripheral edge portion 20c of the lid 20 facing the concave portion 11;
On one of the other sides, hooks 21 and 22 are provided to be engaged with the receiving portions 12 and 14, respectively, and opposing surfaces 12a and 2 of the receiving portions 12 and 14 and the hooks 21 and 22 are provided.
1c, 14a, 22a, 14b, and 22b are fusion-bonded to each other.

According to a third aspect of the present invention, in the propeller fan according to the second aspect, the receiving portion 12 is recessed from the other side surface 10b of the wing body 10 and a part thereof is formed in the recessed portion 11. The receiving part 1 is provided as a concave part which faces and opens, and the hook part 21 is provided on the lid 20 side.
It is characterized in that it is a hook-shaped member that is hooked on the bottom surface 12a through the second opening.

According to a fourth aspect of the present invention, in the propeller fan according to the second aspect, the receiving portion is a concave portion provided on the outer peripheral wall surface of the concave portion of the wing body. The stopper 22 projects laterally from the outer peripheral edge 20 c of the lid 20, and projects from the receiving portion 14.
And a protrusion member that engages with the projection.

[0017]

According to the present invention, the following effects can be obtained by adopting such a configuration.

According to the propeller fan according to the first aspect of the present invention, the thickness of the lid 20 is smaller at the portion closer to the front edge 3a of the blade 3 than at the portion closer to the rear edge 3b. Therefore, the rigidity of the lid 20 is such that the portion of the wing 3 located near the front edge 3a is the rear edge 3b.
It is lower than the part located nearer,
When the blade 3 is bent and deformed by the bending force generated by the centrifugal force accompanying the operation of the propeller fan 1, the lid 20 is deformed following the deformation of the blade main body 10 and the blade 20 is deformed by the lid 20. The bending deformation of the main body 10 is hardly hindered, and the peeling force acting on the joint between the wing main body 10 and the lid 20 is reduced accordingly.

The thickness of the portion of the lid 20 located near the rear edge 3b of the wing 3 is set to be large, so that the thickness of the portion near the front edge 3a is reduced. In addition, the rigidity of the lid 20 and thus the rigidity of the entire wing 3 can be maintained well. As a result, the performance of the propeller fan is maintained and the reliability in operation is ensured.

According to the propeller fan of the second aspect of the present invention, the outer peripheral wall 1 of the recess 11 of the wing body 10 is provided.
At least one of the outer peripheral edge portion 20c of the lid 20 and the receiving portion 12, 14 recessed in the surface direction of the wing 3 is provided on at least one of the outer peripheral edge portion 20c, and the receiving portion 12, 1 is provided on one of the other sides.
4 are provided respectively, and the receiving portions 12 and 14 and the locking portions 21 and 22 are provided.
Opposing surfaces 12a, 21c, 14a, 22a, 14b, 2
When the blades 2b are melt-bonded to each other, the centrifugal force accompanying the operation of the propeller fan 1 causes a bending force to act on the wing 3 and causes the blade 3 to bend and deform.
The force is reduced by the engaging force between the receiving portions 12 and 14 and the engaging portions 21 and 22, and peeling at the joining portion is suppressed as much as possible. Even if peeling occurs at the joining portion, the receiving portion The engagement of the hooks 21 and 22 with the hooks 21 and 22 prevents the lid 20 from separating from the wing body 10 and scattering. As a synergistic effect between them, the maintenance of the performance of the propeller fan and the assurance of operational reliability are achieved.

Since the receiving portions 12, 14 and the hooks 21, 22 are engaged when the wing main body 10 and the lid 20 are combined, the wing main body is actuated by these engaging actions. Positioning at the time of combining the cover 10 and the lid 20 is facilitated, so that the number of manufacturing steps of the propeller fan 1 is reduced and the cost is reduced.

According to the propeller fan of the third aspect of the present invention, in addition to the effects described above, the following unique effects can be obtained. That is, according to the propeller fan 1 of the present invention, the receiving portion 12 is formed as a concave portion which is recessed from the other side surface 10 b of the wing main body 10 and a part of which is open toward the concave portion 11. Part 2
1 is a hook-shaped member provided on the lid 20 side and hooked on the bottom surface 12a through the opening of the receiving portion 12, so that when manufacturing the wing body 10, the mold is inexpensive two-way split type. And the manufacturing cost can be reduced accordingly.

According to the propeller fan according to the fourth aspect of the present invention, the following specific effects can be obtained in addition to the effects described above. That is, according to the propeller fan 1 of the present invention, the receiving portion 14 is a concave portion formed in the outer peripheral wall surface 11 a of the concave portion 11 in the wing body 10, and the latch portion 22 is formed outside the lid 20. Since the projection member protrudes laterally from the peripheral edge portion 20 c and engages with the receiving portion 14, the locking portion 2 of the lid 20 is provided.
2 is not exposed on the wing surface of the wing 3, and the blowing performance is enhanced by improving the aerodynamic characteristics of the wing 3.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a propeller fan according to the present invention will be described based on some preferred embodiments.

First Embodiment FIGS. 1 and 2 show a propeller fan 1 according to a first embodiment of the present invention. This propeller fan 1
Has the same basic structure as that of the above-described conventional propeller fan 50, and a blade 3 described below is circumferentially provided at a predetermined pitch on an outer peripheral surface of a boss 2 rotationally driven by a motor (not shown). (See FIG. 1).
And FIG. 2 illustrates only one specific wing 3 of the plurality of wings 3 for convenience of description).

The wing 3 is a so-called “hollow wing” formed of a resin material and having a cavity 7 therein, and has a united joint structure comprising a wing body 10 and a lid 20 described below. I have.

The wing main body 10 is integrally formed so as to have a substantially fan-shaped wing shape by molding a resin material, and a substantially fan-shaped flat surface is formed on one side surface 10a near the front edge 3a. Recess 1 having a shape and depressed to a predetermined depth
1 is formed. A shelf surface 13 is formed on the outer peripheral edge of the concave portion 11 for abutting the lid 20 described below and joining and fixing the lid 20 by high-frequency joining.

The area of the one side surface 10a of the wing body 10 excluding the concave portion 11 and the entire area of the other side surface 10b together constitute one wing surface of the wing 3 as it is. Further, the other side surface 10b of the wing body 10 constitutes the other wing surface of the wing 3 as it is. And this wing body 10
Has a structure in which the thickness gradually decreases from the portion near the front edge 3a to the portion near the rear edge 3b.

The wing body 10 may be formed integrally with the boss 2 or may be formed separately from the boss 2 and subsequently fastened and assembled to the boss 2. Is also good.

The lid 20 is integrally formed of a resin material, and is a plate having an outer shape corresponding to the planar shape of the recess 11. The thickness of the lid 20 is set so that the portion of the wing 3 located closer to the front edge 3a is thinner than the portion located closer to the rear edge 3b.

The wing body 10 and the lid 2 thus configured
0, the lid 20 is connected to the recess 11 of the wing body 10;
An aerofoil in which a cavity 7 is formed between the wing body 10 and the recess 11 by fitting and fitting the portion corresponding to the shelf surface 57 of the wing body 10 so as to cover the recess 11. A wing 3 having a shape is formed.

In the propeller fan 1 provided with the wings 3 having the above-described structure, when the wings are operated, a bending force is generated in a direction for retracting the wings 3 as viewed from the lid 20 due to centrifugal force accompanying the rotation. Works. In this case, the thickness of the lid 20 is set so that the portion of the wing 3 located closer to the front edge 3a is thinner than the portion located closer to the rear edge 3b. The rigidity of the wing 3 is lower at a portion closer to the front edge 3a than at a portion closer to the rear edge 3b. Therefore, when the wing 3 is bent by receiving the bending force, the lid 20 is deformed following the deformation of the wing body 10, and the wing body 1 is deformed by the lid 20.
0 is less hindered, the peeling force acting on the joint between the wing body 10 and the lid 20 is reduced accordingly, and the wing body 10 and the lid 2 due to the separation of the joint are reduced.
Departure from 0 is suppressed as much as possible.

The thickness of the portion of the lid 20 located near the rear edge 3b of the wing 3 is set to be large, so that the thickness of the portion near the front edge 3a is reduced. In addition, the rigidity of the lid 20 and thus the rigidity of the entire wing 3 can be maintained satisfactorily.

Second Embodiment FIGS. 3 to 5 show a main portion of a blade 3 of a propeller fan 1 according to a second embodiment of the present invention, specifically, a front edge 3a of the blade 3 and an outer portion thereof. A corner portion A where the peripheral edge portion 3c merges (see FIG. 1)
Reference). The propeller fan 1 prevents the propeller fan 1 according to the first embodiment from separating as much as possible at the junction between the wing body 10 and the lid 20 of the wing 3 during its operation. On the other hand, it is possible to prevent the separation at the joint between the wing body 10 and the lid 20 and to go one step further. The wing body 10 is prevented from being separated and scattered.

In order to achieve the above object, a structure specific to the joint structure between the wing body 10 and the lid 20 constituting the wing 3 is employed as described below. Hereinafter, the description will be made focusing on such a specific bonding structure. In the following description, the same components as those of the propeller fan 1 in the first embodiment will be denoted by the same reference numerals used in FIGS. 1 and 2.

The blades 3 of the propeller fan 1 according to the second embodiment are unique to only the portions of the blades 3 where peeling is particularly likely to occur (in other words, the portions most susceptible to bending action due to centrifugal force). In other respects, the joint structure is the same as that of the first embodiment, that is, the lid 20 is fitted and arranged in the concave portion 11 of the wing body 10, and the concave portion is formed. 11 at a position corresponding to the shelf surface 13 provided on the outer peripheral edge of the wing body 10.
And the lid 20 are melt-bonded by high-frequency bonding to integrate them.

Here, the above-mentioned specific joining structure will be specifically described with reference to FIGS. First, in the wing body 10, the other side surface 10b of the wing body 10
Above, at the corner portion A on the outer peripheral side of the leading edge where the leading edge portion 3a and the outer peripheral edge portion 3c of the wing 3 are continuous, the receiving portion 12 composed of a concave hole having a substantially triangular planar shape is formed. A recess is provided straddling the corner of the recess 11 and a solid portion located outside the corner, and a part of the recess is opened in the recess 11, and the other portion is opened in the recess 11. Side 1
A flat bottom surface 12a extending substantially in parallel with 0b is formed.

On the other hand, in the lid 20, a portion of the leading edge side portion 20a of the wing body 10 corresponding to the receiving portion 12 has a leg portion 21a extending substantially orthogonally from the leading edge side portion 20a and the leg portion 21a. A hook portion 21 having a substantially L-shaped configuration including a hook portion 21b extending in a direction substantially orthogonal to the outside from the lower end of the portion 21a is integrally formed.

Then, the concave portion 11 of the wing body 10 is formed.
When the cover 20 is fitted to the wing body, the engaging portion 21 of the cover 20 is inserted downward through the opening of the receiving portion 12 of the wing body 10 so that the bottom surface 12a of the receiving portion 12 and the hook The upper surface 21c of the portion 21b is opposed to the upper surface 21c in a contact state.
a, and a portion corresponding to the hook portion 21b is arranged with an ultrasonic bonding device (not shown) in a state of being sandwiched in the thickness direction of the wing 3, and the receiving portions 12 facing each other in a mutually contacting state are arranged. The bottom surface 12a and the upper surface 21c of the hook 21b are melted by the ultrasonic bonding device to form the bonding portion 4.

The lid 20 has a lower surface of the outer peripheral edge 20c of the wing body 10 and a recessed portion of the wing body 10 at portions other than the corners, as in the case of the first embodiment. The shelf surface 13 of the portion 11 is joined at appropriate locations by ultrasonic joining.

By adopting such a blade joining structure, when a centrifugal force accompanying the operation of the propeller fan 1 causes a bending force to act on the blade 3 and causes the blade 3 to bend and deform, the bottom surface 12a of the receiving portion 12 and the hook The peeling force acting on the joining portion 4 between the upper surface 21c of the portion 21b and the engaging portion 4 is reduced by the engaging force between the receiving portion 12 and the hooking portion 21, and peeling at the joining portion 4 is suppressed as much as possible. In addition, even if the joint 4 is peeled off, the lid 20 is attached to the wing body 1 by the engagement between the receiving portion 12 and the hook 21.
It is surely prevented from flying away from zero. As a synergistic effect of these, the maintenance of the performance of the propeller fan 1 and the assurance of operational reliability are achieved.

Since the receiving portion 12 and the hook portion 21 are engaged when the wing body 10 and the lid 20 are combined, the wing body 10 is engaged by the engagement.
Positioning of the propeller fan 1 and the lid 20 at the time of merging is facilitated, so that the number of manufacturing steps of the propeller fan 1 is reduced, and the cost is reduced.

Further, in the propeller fan 1, the receiving portion 12 is connected to the other side surface 10 of the wing body 10.
b, a part of which is open to face the recess 11, and the hook 21 is provided on the lid 20 side, and the bottom 1 is formed through the opening of the receiving part 12.
Since the hook-shaped member is hooked on 2a, the mold can be made inexpensive two-way split type when manufacturing the wing main body 10, and the manufacturing cost can be reduced accordingly.

Third Embodiment FIGS. 6 and 7 show a main part of a blade 3 of a propeller fan 1 according to a third embodiment of the present invention. The propeller fan 1 has a wing body 1 of the wing 3 associated with its operation, similarly to the propeller fan 1 according to the second embodiment.
The purpose of the present invention is to prevent separation at the joint between the cover 20 and the cover 20 and to prevent the cover 20 from separating from the wing body 10 due to the separation. As described above, the wing body 10 and the lid 20 constituting the wing 3 are described.
The structure peculiar to the joining structure with is adopted.

The wing 3 of the propeller fan 1 according to the third embodiment has a joint united structure composed of a wing body 10 and a lid 20 similarly to the above embodiments, and has a leading edge of the wing 3. The wing body 10 and the lid 20 have a structure unique to the joining structure of the wing body 10 and the lid 20 at a continuous portion between the portion 3a and the outer peripheral edge 3c.

That is, the wing main body 10 is
A receiving portion 14 having a substantially wedge-shaped cross-sectional shape is formed in the vertical wall portion 11a, and a pair of upper and lower inclined surfaces 14a, 14b
Are facing the concave portion 11 side, respectively.

On the other hand, the cover 20 extends outwardly from the outer peripheral edge 20c of the
A hook portion 22 having a substantially wedge-shaped cross-sectional shape having a pair of inclined surfaces 22a and 22b corresponding to the pair of inclined surfaces 14a and 14b on the side is formed.

Then, the concave portion 11 of the wing body 10 is formed.
When the lid 20 is fitted to the wing body 10, the engaging portion 22 of the lid 20 is fitted to the receiving portion 14 of the wing body 10, and then the receiving portion 14 is vertically sandwiched. An ultrasonic bonding device (not shown) is arranged, and the respective inclined surfaces 14a, 14b of the receiving portion 14 and the respective inclined surfaces 22a, 22b of the hooking portion 22 which face each other in a state of contact with each other are each connected to the ultrasonic bonding device. To form the joints 5 and 6, respectively.

The lid 20 has a portion other than the portion corresponding to the corner portion A and the lower surface of the outer peripheral edge portion 20c of the wing body 10 in the same manner as in the first embodiment. The shelf surface 13 of the concave portion 11 of the wing main body 10 is joined at appropriate locations by ultrasonic joining. With such a blade joining structure, when a centrifugal force accompanying the operation of the propeller fan 1 causes a bending force to act on the blade 3 and causes the blade 3 to bend and deform, the peeling force acting on the joint portions 5 and 6 is reduced by the receiving force. The force is reduced by the engaging force between the portion 14 and the engaging portion 22, and peeling at the joining portions 5 and 6 is suppressed as much as possible. Even if the joints 5 and 6 are peeled off,
The engagement between the receiving portion 14 and the engaging portion 22 prevents the lid 20 from separating from the wing body 10 and scattering. As a synergistic effect between them, the maintenance of the performance of the propeller fan and the assurance of operational reliability are achieved.

Further, since the receiving portion 14 and the hook portion 22 are engaged when the wing body 10 and the lid 20 are combined, the wing body 10 is engaged by the engagement.
Positioning of the propeller fan 1 and the lid 20 at the time of merging is facilitated, so that the number of manufacturing steps of the propeller fan 1 is reduced, and the cost is reduced.

Further, according to the propeller fan 1,
The receiving portion 14 is connected to the concave portion 1 in the wing body 10.
1 is formed as a recessed portion on the outer peripheral wall surface 11a, and the engaging portion 22 is a projecting member that projects laterally from the outer peripheral edge portion 20c of the lid body 20 and engages with the receiving portion 14. The engaging portion 22 of the lid 20 is not exposed on the wing surface of the wing 3, and the aerodynamic characteristics of the wing 3 improve the blowing ability.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a propeller fan according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a front view showing a main part of a blade of a propeller fan according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

5 is a view taken in the direction of arrows V-V in FIG. 4;

FIG. 6 is a front view showing a main part of a blade of a propeller fan according to a third embodiment of the present invention.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a sectional view of a blade portion of a conventional propeller fan.

FIG. 9 is an enlarged view of a leading edge portion of the wing shown in FIG.

[Explanation of symbols]

1 is a propeller fan, 2 is a boss, 3 is a wing, 4 to 6 are joints, 10 is a wing body, 11 is a concave portion, 12 is a receiving portion, 13
Is a shelf surface, 14 is a receiving portion, 20 is a lid, 21 is a hook portion, 2
Reference numeral 2 denotes a hook.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04D 29/32-29/38

Claims (4)

(57) [Claims] 1. A boss (2) driven to rotate has a wing shape on an outer peripheral surface thereof and one side surface (10a) thereof.
A wing body (10) provided with a recess (11) in the wing body, and the recess (1) with respect to the recess (11) of the wing body (10).
A plurality of wings (3), (3),... Comprising a lid (20) joined so as to form a cavity (7) between the recess (11) and the recess (11). When viewed from the side of the lid (20) in the direction of the rotation axis, the wing (3) is located rearward from a front edge (3a) located forward in the rotation direction.
b) a propeller fan provided with a predetermined blade mounting angle so as to gradually recede toward b), wherein a plate thickness of the lid (20) is set to a front edge (3) of the blade (3).
a) A propeller fan characterized in that a portion located closer to the rear edge (3b) is set to be thinner than a portion located closer to the trailing edge (3b). 2. The boss (2) being driven to rotate has a wing shape on the outer peripheral surface and one side surface (10a) thereof.
A wing body (10) provided with a recess (11) in the wing body, and the recess (1) with respect to the recess (11) of the wing body (10).
A plurality of wings (3), (3),... Comprising a lid (20) joined so as to form a cavity (7) between the recess (11) and the recess (11). When viewed from the side of the lid (20) in the direction of the rotation axis, the wing (3) is located rearward from a front edge (3a) located forward in the rotation direction.
A propeller fan provided at a predetermined blade mounting angle so as to gradually recede toward b), wherein the outer peripheral wall portion (11a) of the concave portion (11) of the wing body (10) and the opposing outer wall portion (11a) thereof are opposed to the propeller fan. Receiving portions (12), (14) which are recessed in at least one side of the outer peripheral edge portion (20c) of the lid body (20) in the surface direction of the wing (3).
However, on one of the other sides, the receiving portions (12) and (14)
(21) and (22) are provided respectively, and opposing surfaces (12a, 21c) between the receiving portions (12) and (14) and the engaging portions (21) and (22). ,
A propeller fan characterized in that (14a, 22a) and (14b, 22b) are fusion-bonded to each other. 3. The wing body (10) according to claim 2, wherein the receiving portion (12) is recessed from the other side surface (10b) of the wing body (10), and a part of the receiving portion (12) faces the recessed portion (11). The engaging portion (21) is provided on the lid (20) side, and passes through an opening of the receiving portion (12).
A propeller fan, wherein the propeller fan is a hook-shaped member hooked on a). 4. The hook according to claim 2, wherein the receiving portion (14) is a concave portion provided on an outer peripheral wall surface (11a) of the concave portion (11) in the wing body (10). (22) protrudes laterally from the outer peripheral edge (20c) of the lid (20), and receives the receiving portion (14).
A propeller fan, characterized in that it is a projection member that engages with the propeller fan.