JP6364329B2 - Blower - Google Patents

Description

  The present invention relates to a blower.

  Patent Document 1 discloses a technique for cooling a motor by guiding air by rotation of the fan in a motor case that houses a motor that rotates the fan.

Japanese Utility Model Publication No. 61-122456

  For example, for a desired purpose, there is known a blower device in which it is desired to suck air into a fan case and discharge air at a predetermined flow rate by rotation of the fan. Even in such a blower, it is conceivable to cool the motor by guiding a part of the air sucked into the fan case into the motor case.

  However, for example, in order to improve the cooling efficiency of the motor, it is conceivable to increase the flow rate of air flowing from the fan case into the motor case. However, if the flow rate of air flowing from the fan case into the motor case is large, the flow rate of air discharged is reduced with respect to the flow rate of air sucked into the fan case. In such a case, there is a possibility that the original purpose of the blower cannot be achieved. For this reason, there has been a limit to increasing the flow rate of air flowing from the fan case into the motor case. Therefore, there has been a certain limitation on improving the cooling efficiency of the motor.

  Then, an object of this invention is to provide the air blower with which the cooling efficiency to a motor improved.

  The object includes a fan, an air inlet and an air outlet for sucking and discharging air by rotation of the fan, respectively, a fan case housing the fan, a motor driving the fan, and being fixed to the fan case. A motor case that houses the motor, and the motor case has a ventilation opening facing the fan case, and the fan case extends toward the ventilation opening, and the fan case is rotated by rotation of the fan. A cylindrical guide portion for guiding the air inside the motor case through the ventilation port, a gap is defined between the guide portion and the ventilation port, and the fan case and the motor case A ventilation path is defined between the outside of the fan case and the motor case and the ventilation opening, and the motor casing is communicated from the guide portion through the ventilation opening. The venturi effect of air flowing into the scan, flowing the air outside the fan case and the motor case through the air passage and the gap into the motor case can be achieved by the blower.

  It is possible to provide a blower with improved cooling efficiency for the motor.

FIG. 1 is an external view of the air blower of the present embodiment. FIG. 2 is a cross-sectional view of the blower. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a view of the blower device as viewed from below in the axial direction.

  FIG. 1 is an external view of the blower A of this embodiment. FIG. 2 is a cross-sectional view of the blower A. The blower A includes an upper fan case 10, a lower fan case 20, an upper motor case 60, a lower motor case 70, a fan 80, a motor M, and the like. The upper fan case 10 and the lower fan case 20 are assembled and fixed to each other from the axial direction of the fan 80. The upper fan case 10 and the lower fan case 20 are examples of a scroll-shaped fan case that houses the fan 80. The upper fan case 10 and the lower fan case 20 are made of synthetic resin, but are not limited thereto. The upper fan case 10 includes a peripheral wall portion 12, an upper wall portion 14, and a protruding wall portion 18. The peripheral wall portion 12 surrounds the outer peripheral portion of the fan 80 and has a substantially cylindrical shape. The upper wall portion 14 is continuous with the peripheral wall portion 12 and is located on the upper side in the axial direction from the fan 80. The axial direction means the direction of the central axis of rotation of the fan 80. The upper wall portion 14 is formed with an intake port 15a through which air is sucked by the rotation of the fan 80. The upper part of the fan 80 is exposed from the intake port 15a. The protruding wall portion 18 partially extends radially outward from the peripheral wall portion 12 and the upper wall portion 14.

  The lower fan case 20 includes a peripheral wall portion 22, a bottom wall portion 24, and a protruding wall portion 28. The peripheral wall portion 22 surrounds the outer peripheral portion of the fan 80 and has a substantially cylindrical shape. The peripheral wall portions 12 and 22 are fixed to each other. The bottom wall portion 24 is continuous with the peripheral wall portion 22 and is located on the lower side in the axial direction than the fan 80. The protruding wall portion 28 partially extends radially outward from the peripheral wall portion 22 and the bottom wall portion 24. The protruding wall portions 18 and 28 are fixed to each other. As shown in FIG. 1, cutout portions 19 and 29 are formed in the protruding wall portions 18 and 28, respectively. The notches 19 and 29 define a single exhaust port 15b.

  The fan 80 has a plurality of blade portions 88 formed therein. As the fan 80 rotates, air is introduced into the upper fan case 10 and the lower fan case 20 through the blades 88 via the intake port 15a, and the air flows along the inside of the peripheral wall portions 12 and 22. And is discharged from the exhaust port 15b.

  The upper motor case 60 and the lower motor case 70 are examples of a motor case that houses the motor M. The upper motor case 60 and the lower motor case 70 are assembled and fixed to each other from the axial direction. The upper motor case 60 and the lower motor case 70 are made of metal, but may be made of synthetic resin. The upper motor case 60 includes a peripheral wall portion 62, an upper wall portion 64, and fins 68. The peripheral wall portion 62 has a substantially cylindrical shape surrounding the motor M. The upper wall portion 64 is continuous with the peripheral wall portion 62 and is positioned on the upper side in the axial direction from the motor M. The upper wall portion 64 is fixed to the bottom wall portion 24 of the lower fan case 20 with screws or the like. A plurality of fins 68 are provided on the outer surface of the peripheral wall 62, and each fin 68 extends in the axial direction. The fins 68 are for radiating the heat of the motor M in the upper motor case 60 to the outside. The lower motor case 70 includes a peripheral wall portion 72 and a bottom wall portion 74. The peripheral wall portion 72 has a substantially cylindrical shape surrounding the motor M. The bottom wall portion 74 is continuous with the peripheral wall portion 72 and is positioned below the motor M in the axial direction.

  The motor M will be described. The motor M includes a coil 30, a rotor 40, and a stator 50. The stator 50 is made of metal. The stator 50 is fixed to the inner side surfaces of the peripheral wall portions 62 and 72. The lower end of the rotor 40 in the axial direction is rotatably supported by a support portion 75 formed in the lower motor case 70. A cylindrical permanent magnet 46 is fitted on the outer periphery of the portion on the lower end side in the axial direction of the rotor 40. The permanent magnet 46 is surrounded by the stator 50. A rotating shaft 42 extending axially upward from the rotor 40 passes through the upper motor case 60 and the lower fan case 20, and the tip of the rotating shaft 42 is connected to the fan 80. A cylindrical holding portion 65 extending in the axial direction is formed on the upper wall portion 64 of the upper motor case 60, and bearings B <b> 1 and B <b> 2 that hold the rotary shaft 42 rotatably are held in the holding portion 65. Yes.

  A plurality of coils 30 are wound around the stator 50. The coil 30 is electrically connected to a printed circuit board (not shown). The printed circuit board is electrically connected to a cable CB extending from the upper motor case 60 and the lower motor case 70 as shown in FIG. When the coil 30 is energized, the stator 50 is excited. As a result, a magnetic attractive force and a repulsive force act between the permanent magnet 46 and the stator 50. The rotor 40 rotates with respect to the stator 50 by the action of this magnetic force. Thus, the motor M is an inner rotor type motor in which the rotor 40 rotates. When the rotor 40, that is, the rotating shaft 42 rotates, the fan 80 rotates with the rotating shaft 42. Moreover, the fin 68 is located in the radial direction outer side of the motor M, and radiates the heat of the motor M to the outside.

  As shown in FIG. 2, a cylindrical guide portion 25 extending toward the upper motor case 60 is formed on the bottom wall portion 24 of the lower fan case 20. In addition, a ventilation port 66 is formed in the upper wall portion 64 of the upper motor case 60. Therefore, the guide portion 25 extends toward the ventilation port 66. The distal end 25 e of the guide portion 25 is located in the ventilation port 66. As the fan 80 rotates, air is discharged from the exhaust port 15b, and air is discharged into the upper motor case 60 and the lower motor case 70 through the guide portion 25 and the ventilation port 66, and the motor M is cooled. The Further, the air discharged into the upper motor case 60 and the lower motor case 70 is discharged to the outside through the discharge port 76 of the bottom wall portion 74. The guide part 25 and the ventilation opening 66 will be described in detail below.

  FIG. 3 is a partially enlarged view of FIG. The fan 80 is provided with a predetermined gap B so as not to contact the inner bottom surface of the bottom wall portion 24. As the fan 80 rotates, a part of the air sucked into the upper fan case 10 and the lower fan case 20 is, as shown by the arrow W1 in FIG. It flows through the port 66 and flows into the upper motor case 60. The inner side surface 26 and the ventilation port 66 are concentric. Here, between the lower fan case 20 and the upper motor case 60, a ventilation path P is defined in which the outside of the lower fan case 20 and the upper motor case 60 and the ventilation port 66 communicate with each other. Further, a gap C is provided between the distal end 25 e of the guide portion 25 and the inner surface of the ventilation port 66. That is, the inner diameter of the vent 66 is larger than the outer diameter of the tip 25e. Accordingly, the pressure around the tip 25e is reduced by the venturi effect of the air flowing through the guide portion 25 and the ventilation port 66, and the inside of the upper motor case 60 from the outside through the ventilation path P and the gap C as indicated by the arrow W2. Air flows in. Thereby, the flow rate of the air introduced into the upper motor case 60 can be secured, and the cooling efficiency to the motor M is improved.

  Further, air can be introduced into the upper motor case 60 from the outside of the lower fan case 20 and the upper motor case 60 by the venturi effect, so that the air is discharged from the lower fan case 20 into the upper motor case 60 via the guide portion 25. Even when the flow rate of the air to be generated is small, the flow rate of the air flowing to the motor M can be secured. For this reason, the cooling efficiency to the motor M is improved while ensuring the flow rate of the air discharged from the exhaust port 15b.

  Further, the inner diameter of the inner side surface 26 of the guide portion 25 decreases from the lower fan case 20 side toward the upper motor case 60 side, and is constant in the vicinity of the tip 25e. Thus, the cross-sectional area of the flow path through which air flows in the inner surface 26 is reduced. Thereby, the flow velocity of the air flowing in the inner side surface 26 can be increased, and the venturi effect can be exhibited. The inner diameter of the ventilation port 66 is also reduced from the lower fan case 20 side toward the upper motor case 60 side.

  Further, the leading end 25 e of the guide portion 25 is located in the ventilation port 66. For example, when the tip e of the guide portion 25 does not reach the ventilation port 66, a part of the air that flows from the lower fan case 20 toward the upper motor case 60 does not flow into the upper motor case 60 and the ventilation path. There is a risk of leaking outside through P. In this case, it may be difficult to suck outside air into the upper motor case 60 via the ventilation path P. Further, when the tip of the guide portion 25 is located in the upper motor case 60 beyond the ventilation port 66, the portion where the pressure is reduced by the venturi effect is located in the upper motor case 60, and external air is caused by the venturi effect. May be difficult to introduce into the upper motor case 60. In this embodiment, since the tip 25e of the guide portion 25 is located in the ventilation port 66, the upper motor case is externally provided by the venturi effect while ensuring the air flow rate from the lower fan case 20 into the upper motor case 60. The flow rate of the air flowing in 60 can also be secured.

  Further, the air flowing in the upper motor case 60 through the ventilation path P passes between the adjacent fins 68 before passing through the ventilation path P. Next, the fin 68 will be described. FIG. 4 is a view of the blower A viewed from the lower side in the axial direction, and the lower motor case 70 and the coil 30 are omitted. Due to the venturi effect, outside air flows between adjacent fins 68. Thereby, the fin 68 can be cooled and the heat received from the motor M can be radiated.

  The stator 50 includes a ring-shaped ring portion 52 and a plurality of teeth portions 54 extending radially inward from the ring portion 52 and arranged at equal angular intervals. The coils 30 are wound around the teeth portions 54 via insulators (not shown in FIG. 4). When viewed from the axial direction, the guide portion 25 is located between the adjacent tooth portions 54. For this reason, the air flowing into the upper motor case 60 from the guide portion 25 and the ventilation path P flows between the adjacent tooth portions 54, in other words, between the coils 30. Thereby, the coil 30 which is likely to become high temperature by the air flowing through the upper motor case 60 can be efficiently cooled. In the present embodiment, three pairs of guide portions 25 and ventilation openings 66 are provided at equal angular intervals, but the present invention is not limited to this.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

  In the above embodiment, the fins 68 are provided in the upper motor case 60, but may be provided in the lower motor case 70.

A Blower M Motor 10 Upper fan case (fan case)
15a Intake port 15b Exhaust port 20 Lower fan case (fan case)
25 Guide part 25e Tip 40 Rotor 42 Rotating shaft 60 Upper motor case (motor case)
68 Fin 70 Lower motor case (motor case)
80 Fan P Ventilation path C Clearance

Claims (5)

With fans,
A fan case containing the fan, including an intake port and an exhaust port for sucking and discharging air by rotation of the fan, respectively;
A motor for driving the fan;
A motor case fixed to the fan case and containing the motor,
The motor case has a ventilation opening facing the fan case,
The fan case has a cylindrical guide portion that extends toward the ventilation opening and guides air in the fan case into the motor case through the ventilation opening by rotation of the fan.
A gap is defined between the guide portion and the ventilation opening,
Between the fan case and the motor case, a ventilation path that communicates the outside of the fan case and the motor case and the ventilation port is defined,
A blower device in which air outside the fan case and the motor case flows into the motor case through the ventilation path and the gap due to a venturi effect of the air flowing into the motor case from the guide through the ventilation port. . A plurality of fins extending in the axial direction of the fan are provided on the outer surface of the motor case,
The air blower according to claim 1, wherein air flows between the adjacent fins and flows into the ventilation path.   The blower according to claim 1 or 2, wherein an inner diameter of the guide portion decreases from the fan case side toward the motor case side.   The air blower according to any one of claims 1 to 3, wherein a leading end of the guide portion is located in the ventilation opening. The motor includes a stator including a plurality of teeth portions,
The blower according to any one of claims 1 to 4, wherein the guide part and the air vent are located between adjacent tooth parts when viewed from the axial direction of the fan.

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