JP5724380B2 - Axial fan - Google Patents

Description

  The present invention relates to an axial fan, and more particularly to an axial fan used in an outdoor unit of an air conditioner.

  For example, as an axial fan 2 used in an outdoor unit 1 of a type of air conditioner that blows air sideways as shown in FIG. 1, an axial impeller 3 having propeller blades formed on the outer periphery of a hub, A motor provided with an inner rotor type motor 4 for rotationally driving a flow impeller has been widely used. As the outdoor unit, there are various types such as a type in which air is blown out horizontally as shown in FIG. 1 and a type in which air is blown out upward, but in any type of outdoor unit, as shown in FIG. An axial fan 2 using an inner rotor type motor 4 is widely used. The axial flow fan 2 has a structure in which a boss provided at the center of the hub of the axial flow impeller 3 is fixed to the tip of a rotating shaft protruding from the inner rotor of the motor 4.

  Further, as an axial fan used for an outdoor unit of an air conditioner, a shaft having a structure in which an axial-flow impeller is rotationally driven by an outer rotor type motor as in Patent Document 1 (Japanese Patent Laid-Open No. 3-275998). Current fans have also been proposed. This axial fan has a structure in which a shaft-shaped member called a joint hub is projected from the outer rotor of the motor, and the central portion of the hub of the axial fan wheel is fixed to the tip of the joint hub.

  Further, although not an axial fan, a centrifugal multi-blade fan having a structure in which a multi-blade impeller is driven to rotate by an outer rotor type motor as in Patent Document 2 (Japanese Patent Laid-Open No. 2008-223666) has also been proposed. . This centrifugal multiblade fan has a structure in which a motor is integrated with a multiblade impeller by using both a multiblade impeller and an outer rotor by a member called an outer rotor cup.

  In the axial fan using the inner rotor type motor described above, if the positional accuracy of the boss of the axial flow impeller fixed to the tip of the rotating shaft of the motor is poor, the axial flow impeller is likely to run out and run out. Become. In addition, in this axial fan, the motor torque is transmitted through a boss having a small rotation radius, so that a very large force is applied to the boss (that is, the central part of the hub). Torque has to be limited.

  On the other hand, an outer rotor type motor is adopted for the axial fan, and the outer rotor type motor is used as a multi-blade impeller like the centrifugal multi-blade fan using the outer rotor type motor of Patent Document 2. It is conceivable that the structure is integrated with. Then, compared to the axial fan using the inner rotor type motor, the torque of the motor is transmitted at the outer rotor outer peripheral portion having a large rotation radius, so that the axial runout and runout of the axial flow impeller And the allowable torque of the axial-flow impeller is less likely to be limited.

  However, the outdoor unit of the air conditioner has many classes according to the air conditioning capability. For this reason, the axial fan used in the outdoor unit of the air conditioner is also configured by combining several types of axial flow impellers and several types of motors according to the required air blowing performance, motor power, and cost. It is normal. Specifically, the axial fan used in the outdoor unit of the air conditioner is not uniform in the combination of the axial impeller and the motor. For example, a hub with respect to a motor having a rotor of a certain size is used. It is comprised by designing combining the some axial flow impeller from which the magnitude | size differs. In other words, the axial fan used for the outdoor unit of the air conditioner is a so-called axial fan and motor individually designed by combining an individually designed axial fan and an individually designed motor. Is. For this reason, in the axial flow fan used for the outdoor unit of the air conditioner, unlike the centrifugal multiblade fan using the outer rotor type motor of Patent Document 2, the outer rotor type motor is integrated with the axial flow impeller. It is difficult to apply a structure in which a so-called axial flow impeller and motor are designed exclusively.

  In this way, when an outer rotor type motor is to be adopted for an axial fan used in an outdoor unit of an air conditioner, the patent can be applied to the individual design of the axial impeller and the motor. A structure in which the outer rotor and the central portion of the hub of the axial-flow impeller are fixed via a shaft-like member, such as an axial-flow fan using an outer-rotor-type motor of Document 1, is adopted. However, in the axial fan using the outer rotor type motor of Patent Document 1, as with the axial fan using the inner rotor type motor, the problem of surface runout and center runout of the axial flow impeller, and The problem arises that the allowable torque of the axial flow impeller is limited.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an axial fan capable of suppressing the surface vibration and the center vibration of the impeller and making it difficult to limit the allowable torque without specially designing the axial impeller and the motor. There is.

  The axial flow fan concerning a 1st viewpoint has an axial flow impeller, a motor, and a fan fixing member. The axial-flow impeller has a hub having a cylindrical hub outer peripheral portion and propeller-shaped blades formed on the hub outer peripheral portion. The motor is an outer rotor type motor that rotationally drives the axial impeller. The fan fixing member is a member that connects the axial impeller to the motor, and includes a radially inner peripheral portion and a radially outer peripheral portion. The radially inner peripheral portion is a portion fixed to the outer rotor of the motor. The radially outer peripheral portion is in contact with the hub outer peripheral portion and is a portion fixed to the hub outer peripheral portion.

  In this axial flow fan, the fan fixing member is interposed in the connection between the outer rotor type motor and the axial flow impeller. Therefore, in the structure in which the axial flow impeller and the motor individually designed are combined. Torque can be transmitted from the motor via the hub outer periphery having a large turning radius.

  This makes it possible to use an outer rotor type motor that can suppress the surface runout and center runout of the axial flow impeller and make it less likely to be limited by the allowable torque, without designing the axial flow impeller and motor exclusively. An axial fan can be provided.

In addition, here, the fan fixing member extends between the radially inner peripheral portion and the radially outer peripheral portion and extends toward the radially outer peripheral side to connect the radially inner peripheral portion and the radially outer peripheral portion. An adjustment part is further provided, and a gap is formed between the outer rotor and the radially outer peripheral part by the dimension adjustment part.

Thereby, in this axial fan, the basic shape of the fan fixing member (that is, the shape having the radially inner peripheral portion and the radially outer peripheral portion) is changed by changing the radial dimension of the dimension adjusting portion. Therefore, it is possible to absorb the radial dimension difference between the outer rotor and the hub that occurs when the axial fan is configured using the individually designed axial fan wheel and motor.

  In the axial fan according to the second aspect, the axial fan according to the first aspect has a shape in which the radially outer peripheral portion sandwiches the hub outer peripheral portion from the inner peripheral side and the outer peripheral side.

  In this axial fan, the contact area between the radial outer peripheral portion and the hub outer peripheral portion can be increased, and the radial outer peripheral portion can be pressed against the hub outer peripheral portion from both radial directions, so that the torque from the motor The transmission can be further improved and the fixing between the outer peripheral portion of the hub and the outer peripheral portion in the radial direction can be strengthened.

The axial fan according to the third aspect is the axial fan according to the first or second aspect, wherein the radially inner peripheral portion is in contact with the radially outer peripheral portion of the outer rotor.

  In this axial fan, torque transmission from the motor can be performed via the radially outer peripheral portion of the outer rotor having a large rotational radius. In particular, when the radially inner peripheral portion contacts the radially outer peripheral surface of the outer rotor, the contact area between the radially inner peripheral portion and the outer rotor can be increased, so that torque transmission from the motor is further improved. In addition, the radial inner periphery and the outer rotor can be firmly fixed.

The axial fan according to the fourth aspect is the axial fan according to any one of the first to third aspects , wherein the hub-side concave shape or the hub-side convex shape is formed at a portion in contact with the radially outer peripheral portion of the hub outer peripheral portion. A fixed member-side convex shape or a fixed-member-side concave shape that engages with the hub-side concave shape or the hub-side convex shape is formed at a portion that is in contact with the hub outer peripheral portion of the radial outer peripheral portion. .

  In this axial fan, torque transmission from the motor can be further improved, and a rotational misalignment between the radially outer peripheral portion and the hub outer peripheral portion can be eliminated.

An axial fan according to a fifth aspect is the axial fan according to any one of the first to fourth aspects , wherein the fan fixing member is located on one end side in the rotational axis direction of the axial flow impeller in the outer peripheral portion of the hub. A lid member fixed to the outer peripheral portion of the hub is provided on a portion of the outer peripheral portion of the hub opposite to the side on which the fan fixing member is fixed.

  This axial fan can support both ends of the hub outer periphery in the axial direction, and the hub has only a cylindrical hub outer periphery (that is, it does not have a portion covering the opening of the hub outer periphery or a reinforcing rib). Therefore, when the axial flow impeller is molded with resin, the material used for forming the axial flow impeller can be reduced, and the cooling time during molding can be shortened. Costs can be reduced in terms of both processing costs.

The axial fan according to the sixth aspect is the axial fan according to any of the fifth aspects , wherein the lid member sandwiches the outer peripheral portion of the hub from the inner peripheral side and the outer peripheral side.

  In this axial fan, the lid member can be pressed against the outer peripheral portion of the hub from both sides in the radial direction, so that the fixation between the outer peripheral portion of the hub and the lid member can be strengthened.

  As described above, according to the present invention, the following effects can be obtained.

In the axial fan according to the first aspect, the axial flow impeller and motor can be suppressed without being designed exclusively, and the axial flow impeller and the runout can be suppressed, and the allowable torque can be made difficult to be limited. become. Moreover, without changing the basic shape of the fan fixing member, it absorbs the radial dimensional difference between the outer rotor and the hub that occurs when an axial fan is configured using an individually designed axial fan and motor. can do.

In the axial fan according to the second aspect, torque transmission from the motor can be further improved, and the hub outer peripheral portion and the radial outer peripheral portion can be firmly fixed.

In the axial fan according to the third aspect , torque can be transmitted from the motor via the radially outer peripheral portion of the outer rotor having a large rotation radius.

In the axial fan according to the fourth aspect , torque transmission from the motor can be further improved, and positional deviation in the rotational direction between the radially outer peripheral portion and the hub outer peripheral portion can be eliminated.

In the axial fan according to the fifth aspect , when the axial flow impeller is resin-molded, the material used for molding the axial flow impeller can be reduced, and the cooling time at the time of molding can be shortened. Costs can be reduced in terms of both material costs and processing costs.

In the axial fan according to the sixth aspect , the fixing between the hub outer peripheral portion and the lid member can be strengthened.

It is a perspective view which shows the outdoor unit by which the axial flow fan of the prior art example was employ | adopted. It is sectional drawing of the axial fan concerning one Embodiment and the modification 1 of this invention. It is an enlarged view of the A section of FIG. 2 or FIG. It is an exploded sectional view of an axial fan concerning one embodiment and modification 1 of the present invention. It is a figure which shows a mode that the radial direction dimension of the dimension adjustment part of a fan fixing member is changed when changing the combination of an axial-flow impeller and a motor. It is a figure which shows the axial-flow fan concerning the modifications 1 and 2 of this invention, and is II sectional drawing of FIG. 2 or FIG. It is sectional drawing of the axial fan concerning the modification 2 of this invention. It is an exploded sectional view of an axial fan concerning modification 2 of the present invention. It is sectional drawing of the axial fan concerning the modification 3 of this invention, Comprising: It is a figure corresponded in FIG. It is sectional drawing of the axial fan concerning the modification 3 of this invention, Comprising: It is a figure corresponded in FIG.

  Hereinafter, an embodiment of an axial fan according to the present invention will be described with reference to the drawings. The specific configuration of the axial fan according to the present invention is not limited to the following embodiments and modifications thereof, and can be changed without departing from the scope of the invention.

(1) Configuration FIG. 2 is a cross-sectional view of an axial fan 10 according to an embodiment of the present invention. FIG. 3 is an enlarged view of part A in FIG. FIG. 4 is an exploded cross-sectional view of the axial fan 10. Here, a line OO in FIG. 2 or the like is a rotational axis of the axial fan 10, and in the following description, a direction along the rotational axis OO is an axial direction, and a motor 30 side to be described later in the axial direction. This direction is the axial motor side, and the opposite direction to the axial motor side is the axial impeller side. Further, the direction orthogonal to the rotation axis OO is the radial direction, the direction away from the rotation axis OO toward the outer peripheral side in the radial direction is the radial outer periphery side, and the rotation axis OO is the radial direction. The direction approaching is defined as the radially inner side.

  The axial fan 10 is used for the outdoor unit 1 of the air conditioner that blows air sideways and the outdoor unit of the air conditioner that blows air upward, like the conventional axial fan 2 shown in FIG. is there.

  The axial flow fan 10 mainly includes an axial flow impeller 20, a motor 30, and a fan fixing member 40.

  The axial flow impeller 20 includes a hub 21 and blades 28. The axial flow impeller 20 is a resin member, and the hub 21 and the blades 28 are integrally formed by injection molding. The hub 21 includes a cylindrical hub outer peripheral portion 22 and a disc-shaped hub-side disc portion 25. A first end portion 23, which is an end portion on the axial motor side of the hub outer peripheral portion 22, extends toward the axial motor side from a base portion on the axial motor side with respect to the hub outer peripheral portion 22 of the blade 28. A hub-side disc portion 25 is formed at the second end portion 24 that is the end portion of the hub outer peripheral portion 22 on the axial impeller side. The hub-side disc portion 25 is a disc-shaped portion that covers the opening on the second end portion 24 side of the hub outer peripheral portion 22. The blade 28 is a propeller-shaped blade formed on the hub outer peripheral portion 22. A space in which most of the motor 30 is arranged is formed on the radially outer peripheral side of the hub outer peripheral portion 22.

  The motor 30 is an outer rotor type motor that rotationally drives the axial-flow impeller 20. The motor 30 mainly has a stator 31 and an outer rotor 32. Although not shown here, the stator 31 is supported by a motor support of an outdoor unit or the like, and is supplied with power from the outside. The outer rotor 32 is disposed so as to face the radially outer peripheral side of the stator 31. The outer rotor 32 includes a first bearing 32 disposed near the end of the stator 31 on the axial motor side and a second bearing 33 disposed near the end of the stator 31 on the axial impeller side. Thus, the periphery of the stator 31 is supported in a freely rotatable state. When the stator 31 is energized, the outer rotor 32 is rotationally driven.

  The fan fixing member 40 is a member that couples the axial flow impeller 20 to the motor 30. The fan fixing member 40 mainly has a radially inner peripheral portion 50 and a radially outer peripheral portion 60. The fan fixing member 40 is a metal member, and each part such as the radial inner periphery 50 and the radial outer periphery 60 is formed by sheet metal processing or the like.

  The radially inner peripheral portion 50 is a portion that is fixed to the outer rotor 32. The radially inner peripheral portion 50 is in a state where it does not contact the portion on the stator 31 side of the motor 30 (that is, the portion of the first and second bearings 33 and 34 that is integral with the stator 31 and the stator 31). Are arranged in a space between the axial direction impeller side end portion (here, the hub side disc portion 25) and the axial end impeller side end portion of the motor 30 in the axial direction. The radially inner peripheral portion 50 has a shape that substantially conforms to the outer shape of the outer rotor 32 of the motor 30. The radially inner peripheral portion 50 includes a rotor contact portion 51, a fixed member side cylindrical portion 52, and a fixed member side disc portion 53. The rotor contact portion 51 is a portion that contacts the outer rotor 32. Here, the rotor contact portion 51 is a ring-shaped portion disposed on the axial impeller side of the outer rotor 32, and is in contact with the radially outer peripheral portion of the end surface of the outer rotor 32 on the axial impeller side. doing. The rotor contact portion 51 is fixed to the outer rotor 32 by screws, adhesion, or the like. The fixed member-side cylindrical portion 52 is a cylindrical portion that extends from the radially inner end of the rotor contact portion 51 toward the axial impeller side. The fixed member-side disc portion 53 is a disc-shaped portion that covers the opening on the end portion side on the axial impeller side of the fixed member-side cylindrical portion 52.

  The radially outer peripheral portion 60 is a portion that is in contact with the hub outer peripheral portion 22 and is fixed to the hub outer peripheral portion 20. Most of the radially outer circumferential portion 60 is not in contact with the stator 31 side portion of the motor 30 (that is, the portion of the first and second bearings 33 and 34 that is integral with the stator 31 and the stator 31). It is arranged between the hub outer peripheral portion 22 and the outer rotor 32 in the radial direction. The radially outer peripheral portion 60 includes an inner peripheral contact portion 61, a fixed member side bent portion 62, and an outer peripheral contact portion 63. The inner peripheral contact portion 61 is a portion that contacts the hub outer peripheral portion 22. Here, the inner peripheral contact portion 61 is a cylindrical portion disposed on the outer peripheral side in the radial direction of the outer rotor 32, and is in contact with the surface on the inner peripheral side in the radial direction of the hub outer peripheral portion 22. The inner peripheral contact portion 61 extends from the vicinity of the end of the outer rotor 32 on the axial impeller side toward the axial motor side to the end of the hub outer peripheral portion 22 on the axial motor side. The fixed member-side bent portion 62 is an annular portion extending from the end on the axial motor side of the inner peripheral abutment portion 61 toward the outer periphery in the radial direction, and the end surface on the axial motor side of the hub outer peripheral portion 22. Touching. The outer peripheral side contact portion 63 is a cylindrical portion extending from the end portion on the radial outer peripheral side of the fixed member side bending portion 62 toward the axial impeller side, and the surface on the radial outer peripheral side of the hub outer peripheral portion 22. Touching. That is, the inner peripheral side contact portion 61, the fixed member side bent portion 62, and the outer peripheral side contact portion 63 of the radial outer peripheral portion 60 form a shape that sandwiches the hub outer peripheral portion 22 from the inner peripheral side and the outer peripheral side. . Thereby, the radial direction outer peripheral portion 60 is fixed to the hub outer peripheral portion 22. The torque from the motor 30 is transmitted from the outer rotor 32 to the hub outer peripheral portion 22 via the fan fixing member 40.

  Further, between the radial inner peripheral portion 50 and the radial outer peripheral portion 60 of the fan fixing member 40, the gap extends between the radial inner peripheral portion 50 and the radial outer peripheral portion 60. A connecting dimension adjusting unit 70 is further formed. More specifically, the dimension adjusting unit 70 includes an end portion on the radially outer peripheral side of the radially inner peripheral portion 50 (here, an end portion on the radially outer peripheral side of the rotor contact portion 51), and a radially outer peripheral portion. 60 is a ring-shaped portion that connects between the end portion on the radially inner peripheral side of 60 (here, the end portion on the axial impeller side of the inner peripheral contact portion 61). Here, the dimension adjusting portion 70 is a continuous portion with the rotor contact portion 51 of the radially inner peripheral portion 50. Thereby, a gap S is formed between the outer rotor 32 and the radially outer peripheral portion 60 in the radial direction.

(2) Features The axial fan 10 of this embodiment has the following features.

<A>
In the axial fan 10 of the present embodiment, the fan fixing member 40 having the radial inner peripheral portion 50 and the radial outer peripheral portion 60 as described above is connected to the outer rotor type motor 30 and the axial impeller 20. To intervene.

  For this reason, in the structure in which the axial flow impeller 20 individually designed in consideration of the air blowing performance and the motor 30 individually designed in consideration of the motor power etc. is combined, torque transmission from the motor 30 is transmitted to the rotation radius. Can be performed through the hub outer peripheral portion 22 having a large diameter.

  Thereby, in this axial flow fan 10, the axial flow impeller 20 and the motor 30 are not specially designed, and the surface runout and the center runout of the axial flow impeller 20 are suppressed, and the allowable torque is not easily limited. Can do.

<B>
In the axial fan 10 of the present embodiment, the hub outer peripheral portion 22 as described above is arranged on the inner peripheral side and the hub outer peripheral portion 22 as described above as a fixing structure of the radial outer peripheral portion 60 of the fan fixing member 40 to the hub outer peripheral portion 22 of the axial flow impeller 20. A shape that is sandwiched from the outer periphery is adopted.

  For this reason, in this axial fan 10, compared with the case where only the inner peripheral side contact part 61 is provided as the radial direction outer peripheral part 60, the fixed member side bent part 62 and the outer peripheral side contact part 63 are provided. The contact area between the radially outer peripheral portion 60 and the hub outer peripheral portion 22 can be increased by the amount provided.

  Thereby, in this axial fan 10, torque transmission from the motor 30 can be further improved.

  Moreover, the radially outer peripheral portion 60 can be pressed against the hub outer peripheral portion 22 from both radial directions.

  Thereby, in this axial fan 10, compared with the case where only the inner peripheral side contact part 61 is provided as the radial outer peripheral part 60, for example, the hub outer peripheral part 22 and the radial outer peripheral part 60 are fixed. Can be strong.

  Note that the fixing structure of the radial outer peripheral portion 60 of the fan fixing member 40 to the hub outer peripheral portion 22 of the axial-flow impeller 20 may be used in combination with fixing by screws or adhesion.

<C>
In the axial fan 10 according to the present embodiment, the fan fixing member 40 extends between the radially inner peripheral portion 50 and the radially outer peripheral portion 60 toward the radially outer peripheral side and extends in the radial inner peripheral portion 50 and the diameter. What further has the dimension adjustment part 70 which connects between the direction outer peripheral parts 60 is employ | adopted.

  For this reason, in this axial flow fan 10, it can respond to the combination of the various axial flow impeller 20 and the motor 30 by changing the radial direction dimension of the dimension adjustment part 70 of the fan fixing member 40. FIG. More specifically, for example, as shown in FIG. 5, the motor 30 combined with the axial-flow impeller 20 (radius R of the hub outer peripheral portion 22) has a larger size (the radius r1 of the outer rotor 32, FIG. 5). In the case of changing to a smaller size (radius r2, see the two-dot chain line in FIG. 5), the radial gap between the outer rotor 32 and the radial outer periphery 60 is changed from S1 to S2. What is necessary is just to enlarge the radial direction dimension of the dimension adjustment part 70 so that it may be changed. On the contrary, the motor 30 combined with the axial-flow impeller 20 (radius R of the hub outer peripheral portion 22, see the two-dot chain line in FIG. 5) is changed from a small size (radius r2 of the outer rotor 32) to a large size. In the case of changing to (radius r1, see the solid line in FIG. 5), the diameter of the dimension adjusting portion 70 is changed so that the radial gap between the outer rotor 32 and the radially outer peripheral portion 60 is changed from S2 to S1. What is necessary is just to make a direction dimension small.

  Thus, the axial fan 10 has the basic shape of the fan fixing member 40 (that is, the radially inner peripheral portion 50 and the radially outer peripheral portion 60) by changing the radial dimension of the dimension adjusting portion 70. It is possible to absorb the radial dimensional difference between the outer rotor 32 and the hub 21 that occurs when the axial fan 10 is configured using the individually designed axial fan wheel 20 and motor 30 without changing the shape). it can.

<D>
In the axial fan 10 of the present embodiment, the radially inner peripheral portion 50 of the fan fixing member 40 is the radially outer peripheral portion of the outer rotor 32 (more specifically, the end face of the outer rotor 32 on the axial impeller side). (The portion near the outer periphery in the radial direction).

  Thereby, in this axial fan 10, torque transmission from the motor 30 can be performed via the radial direction outer peripheral part of the outer rotor 32 with a large rotation radius.

(3) Modification 1
In the axial fan 10 of the above embodiment, it is preferable to further improve the torque transmission from the motor 30. Therefore, in the axial fan 10 of this modification, as shown in FIG. 6A, the hub side recess 26 as a hub side recess shape is formed in a portion of the hub outer periphery 22 in contact with the radial outer periphery 60. Even if the fixing member side convex portion 64 as the fixing member side convex shape that engages with the hub side concave portion 26 as the hub side concave shape is formed in the portion of the radial outer peripheral portion 60 that contacts the hub outer peripheral portion 22. Good. Alternatively, as shown in FIG. 6B, a hub-side convex portion 27 as a hub-side convex shape is formed in a portion that contacts the radial outer peripheral portion 60 of the hub outer peripheral portion 22, and the hub of the radial outer peripheral portion 60 is formed. A fixing member side concave portion 65 as a fixing member side concave shape that engages with the hub side convex portion 27 as the hub side convex shape may be formed in a portion in contact with the outer peripheral portion 22. Here, a plurality of the hub-side concave portion 26 and the fixing member-side convex portion 64, or the hub-side convex portion 27 and the fixing member-side concave portion 65 are formed so as to be aligned in the circumferential direction.

  In the axial fan 10 of the present modification, torque transmission from the motor 30 can be further improved, and the rotational displacement between the radially outer peripheral portion 60 and the hub outer peripheral portion 22 can be eliminated.

  In FIG. 6, the hub side concave portion 26 and the hub side convex portion 27 are formed in the inner peripheral side contact portion 61 of the radial outer peripheral portion 60, and the fixing member side convex portion 64 and the fixing member side concave portion 65 are formed. Although it forms in the surface of the radial direction inner peripheral side of the hub outer peripheral part 22, it is not limited to this. For example, the hub side concave portion 26 and the hub side convex portion 27 are formed in the outer peripheral side contact portion 63 of the radial outer peripheral portion 60, and the fixing member side convex portion 64 and the fixing member side concave portion 65 are formed in the diameter of the hub outer peripheral portion 22. You may form in the surface of a direction outer peripheral side. Alternatively, the hub-side concave portion 26 and the hub-side convex portion 27 are formed in the fixing member-side bent portion 62 of the radial outer peripheral portion 60, and the fixing member-side convex portion 64 and the fixing member-side concave portion 65 are formed on the axis of the hub outer peripheral portion 22 You may form in the end surface by the side of a direction motor.

(4) Modification 2
In the axial fan 10 according to the embodiment and the first modification, the fan is fixed to a portion of the hub outer peripheral portion 22 on one end side in the rotational axis direction of the axial flow impeller 20 (that is, a portion on the first end portion 23 side). Although the member 40 is fixed, as shown in FIGS. 7 and 8, the portion of the hub outer peripheral portion 22 opposite to the side on which the fan fixing member 40 is fixed (that is, the second end portion 24 side). The lid member 80 may be fixed to the portion.

  More specifically, the lid member 80 mainly has a lid-side disk portion 81, an inner peripheral contact portion 82, a cover-side bent portion 83, and an outer peripheral contact portion 84. The lid member 80 is a metal member, and each part such as the lid-side disk portion 81 and the inner circumferential contact portion 82 is formed by sheet metal processing or the like. The lid-side disc portion 81 is a disc-shaped portion that covers the opening on the second end portion 24 side of the hub outer peripheral portion 22. The inner peripheral contact portion 82 is a portion that contacts the second end 24 of the hub outer peripheral portion 22. Here, the inner peripheral contact portion 82 is a cylindrical portion disposed on the outer peripheral side in the radial direction of the outer rotor 32, and is in contact with the surface on the inner peripheral side in the radial direction of the second end portion 24. The inner peripheral side contact portion 82 extends from the vicinity of the end portion of the second end portion 24 toward the axial impeller side. The lid-side bent portion 83 is a ring-shaped portion extending from the end on the axial impeller side of the inner peripheral abutting portion 82 toward the outer peripheral side in the radial direction, and on the axial impeller side of the second end 24. It is in contact with the end face of. The outer peripheral contact portion 84 is a cylindrical portion extending from the radial outer peripheral end of the lid-side bent portion 83 toward the axial motor side, and on the radial outer peripheral surface of the second end 24. In contact. That is, the inner end side contact portion 82, the cover side bent portion 83, and the outer periphery side contact portion 84 of the lid member 80 form a shape that sandwiches the second end portion 24 from the inner periphery side and the outer periphery side. Accordingly, the lid member 80 is fixed to the second end portion 24 of the hub outer peripheral portion 22. Here, the second end portion 24 of the hub outer peripheral portion 22 extends toward the axial impeller side from the root portion on the axial impeller side with the hub outer peripheral portion 22 of the blade 28. The lid member 80 is fixed to this portion.

  In the axial fan 10 of the present modification, both ends of the hub outer peripheral portion 22 in the axial direction can be supported, and the hub 21 is only the cylindrical hub outer peripheral portion 22, that is, a portion that covers the opening of the hub outer peripheral portion 22. The hub side disk portion 25 (see FIGS. 2 and 4) and the reinforcing rib can be omitted. For this reason, when the axial flow impeller 10 is resin-molded, the material used for forming the axial flow impeller 10 can be reduced, and the cooling time at the time of molding can be shortened. Costs can be reduced on both sides.

  Moreover, in the axial fan 10 of the present modification, the lid member 80 (here, the inner circumferential side contact portion 82, the lid side bent portion 83, and the outer circumferential side contact portion 84) connects the hub outer circumferential portion 22 to the inner circumferential side. And a shape sandwiched from the outer peripheral side. For this reason, in this axial fan 10, since the lid member 80 (here, the inner peripheral side contact portion 82 and the outer peripheral side contact portion 84) can be pressed against the hub outer peripheral portion 22 from both radial sides, The fixation between the outer peripheral portion 22 and the lid member 80 can be strengthened.

  Further, although not shown here, the lid member 80 may be fixed to the fan fixing member 40 by screws, adhesion or the like. As a result, torque from the motor 30 can be transmitted to the hub outer peripheral portion 22 via the lid member 80, so that torque transmission from the motor 30 can be further improved.

(5) Modification 3
In the axial fan 10 according to the embodiment and the first and second modifications, the axially motor-side end portion of the cylindrical fixing member side cylindrical portion 52 of the radial inner peripheral portion 50 of the fan fixing member 40 is used. Although the ring-shaped portion extending toward the radially outer peripheral side is the rotor contact portion 51, as shown in FIG. 9 or FIG. 10, a part of the fixed member side cylindrical portion 52 is the rotor contact portion. Alternatively, a cylindrical rotor contact portion extending along the outer circumferential surface of the outer rotor 32 in the radial direction is further formed between the rotor contact portion 51 and the dimension adjusting portion 70 in the embodiment and the first and second modifications. .

  More specifically, in FIG. 9, the diameter of the radially inner peripheral surface of the fixing member side tubular portion 52 is formed to be the same as the outer diameter of the radially outer peripheral surface of the outer rotor 32, and the fixing member The axial motor side portion of the side cylindrical portion 52 is brought into contact with the radially outer peripheral surface of the outer rotor 32 as the rotor contact portion 51, and the rotor contact portion 51 is fixed to the outer rotor 32 by screws, adhesion, or the like. The entire portion that has been the rotor contact portion 51 in the embodiment and the first and second modifications is referred to as a dimension adjusting portion 70.

  Further, in FIG. 10, a cylindrical portion having the same inner diameter as the diameter of the outer circumferential surface of the outer rotor 32 is extended from the end portion on the outer circumferential side of the rotor contact portion 51 toward the axial motor side. This portion is brought into contact with the outer peripheral surface of the outer rotor 32 in the radial direction as the rotor contact portion 51, and the rotor contact portion 51 is fixed to the outer rotor 32 by screws, adhesion, or the like. And the dimension adjustment part 70 is formed toward the radial direction outer peripheral side from the edge part by the side of the axial direction motor of this rotor contact part 51. As shown in FIG.

  In the axial fan 10 of the present modification, torque transmission from the motor 30 can be performed via the radially outer peripheral portion of the outer rotor 32 having a large rotation radius, as in the above embodiment and Modifications 1 and 2. In particular, in this axial fan 10, since the radially inner peripheral portion 50 is in contact with the radially outer peripheral surface of the outer rotor 32, the contact area between the radially inner peripheral portion 50 and the outer rotor 32 is increased. Therefore, torque transmission from the motor 30 can be further improved, and the radial inner periphery 50 and the outer rotor 32 can be firmly fixed.

  The present invention is widely applicable to an axial fan used for an outdoor unit of an air conditioner.

DESCRIPTION OF SYMBOLS 10 Axial fan 20 Axial-flow impeller 21 Hub 22 Hub outer peripheral part 28 Wing | blade 30 Motor 32 Outer rotor 40 Fan fixing member 50 Radial direction inner peripheral part 60 Radial direction outer peripheral part 70 Dimension adjustment part 80 Cover member

JP-A-3-275998 JP 2008-223666 A

Claims (6)

An axial-flow impeller (20) having a hub (21) having a cylindrical hub outer peripheral portion (22) and a propeller-shaped blade (28) formed on the hub outer peripheral portion;
An outer rotor type motor (30) for rotationally driving the axial-flow impeller;
A radial inner peripheral portion (50) fixed to the outer rotor (32) of the motor, and a radial outer peripheral portion (60) in contact with the hub outer peripheral portion and fixed to the hub outer peripheral portion. A fan fixing member (40) for connecting the axial-flow impeller to the motor;
Equipped with a,
The fan fixing member extends between the radially inner peripheral portion and the radially outer peripheral portion and extends toward the radially outer peripheral side to connect the radially inner peripheral portion and the radially outer peripheral portion. An adjustment unit (70);
Between the outer rotor and the radially outer periphery, a gap is formed by the dimension adjustment unit,
An axial fan (10). The radially outer peripheral part (60) has a shape that sandwiches the hub outer peripheral part (22) from the inner peripheral side and the outer peripheral side,
The axial fan (10) according to claim 1. The radially inner periphery (50) is in contact with the radially outer periphery of the outer rotor (32).
The axial fan (10) according to claim 1 or 2 . A hub-side concave shape or a hub-side convex shape is formed on a portion of the hub outer peripheral portion (22) that is in contact with the radial outer peripheral portion (60).
A fixed member-side convex shape or a fixed-member-side concave shape that is engaged with the hub-side concave shape or the hub-side convex shape is formed in a portion of the radial outer peripheral portion that contacts the hub outer peripheral portion.
The axial fan (10) according to any one of claims 1 to 3 . The fan fixing member (40) is fixed to a portion of the hub outer peripheral portion (22) on one end side in the rotational axis direction of the axial flow impeller (20),
A lid member (80) fixed to the hub outer peripheral portion is provided on a portion of the hub outer peripheral portion opposite to the side on which the fan fixing member is fixed.
The axial fan (10) according to any one of claims 1 to 4 . The lid member (80) has a shape that sandwiches the hub outer peripheral portion (22) from the inner peripheral side and the outer peripheral side,
The axial fan (10) according to claim 5 .

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