JP2009221928A - Multiblade fan and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiblade fan capable of improving the cooling efficiency of a motor and preventing infiltration of water droplets into the motor. <P>SOLUTION: A disc section 21 fixed to a rotary shaft 12 of a brushless motor (the motor) 10 and having ventilation openings 30 formed thereon to pass air flowing out of exhaust openings 18 of the brushless motor 10 through has a gentle slope portion 24 gently sloping toward a coupling ring portion 26 from the circumference of a shaft connecting portion 23 fixed to the rotary shaft 12 and a vertical surface portion 25 extending along the axial direction from the gentle slope portion 24, wherein the ventilation openings 30 are formed where they face the exhaust openings 18 at the vertical surface portion 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sirocco fan that is a centrifugal fan using a motor as a drive source.

  2. Description of the Related Art Conventionally, a sirocco fan that includes a disk portion that covers a motor and in which a ventilation opening that allows air flowing out from an exhaust opening of the motor to pass is formed in the disk portion is known. (For example, refer to Patent Document 1).

  The disk portion of the sirocco fan has a saddle shape that exhibits a curve from the shaft coupling portion fixed to the rotating shaft of the motor toward the outer edge of the disk portion.

  Here, in this sirocco fan, if a ventilation opening is formed at a position where the exhaust opening of the motor faces, water droplets that have entered from the ventilation opening fall into the exhaust opening of the motor, which may cause a malfunction of the motor.

  Therefore, it is considered that the ventilation opening and the exhaust opening are positioned so as to be shifted along the circumferential direction of the disk portion, or that the ventilation opening is positioned on the outer edge side of the disk portion with respect to the exhaust opening.

That is, a sirocco fan is considered in which the exhaust opening of the motor does not face the ventilation opening formed in the disk portion.
JP 2006-90297 A

  By the way, in the sirocco fan in which the exhaust opening does not face the ventilation opening, the air flowing out from the exhaust opening flows along the inside of the disk portion and then passes through the ventilation opening.

  For this reason, the flow of air flowing out from the exhaust opening meanders inside the disk portion, causing flow path loss, resulting in a problem of reducing the cooling efficiency of the motor.

  Further, when the exhaust opening faces the ventilation opening in the bowl-shaped disk portion, water droplets that have entered from the ventilation opening fall into the exhaust opening, which may cause a malfunction of the motor.

  Accordingly, an object of the present invention is to provide a sirocco fan capable of improving the cooling efficiency of the motor and preventing water droplets from entering the motor.

  In order to solve the above-described problems, the present invention provides a disk portion that covers a motor and is fixed to a rotation shaft of the motor, and has a ventilation opening through which air that has flowed out from an exhaust opening of the motor passes. A sirocco fan that is provided in an axial direction from an outer edge portion of the portion and surrounds the disk portion and rotates integrally with the rotating shaft, wherein the disk portion is attached to the rotating shaft. A shaft coupling portion that is fixed; a gentle slope portion that gently slopes from the periphery of the shaft joint portion toward the outer edge portion; and a vertical surface portion that extends from the gentle slope portion along the axial direction. An opening is the vertical surface portion, and is formed at a position where the exhaust opening faces.

  The vent opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion, and a pair of axial opening ends extending in the axial direction, of the pair of axial opening ends. In addition, a rib projecting toward the plurality of blades is formed at least on the inlet side in the rotational direction.

  In addition, the rib is formed so as to protrude from each of the pair of axial opening ends, and the rib located on the inlet side in the rotational direction protrudes larger than the rib located on the outlet side in the rotational direction. It is characterized by having.

  The vent opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion, and a pair of axial opening ends extending in the axial direction, and the pair of circumferential opening ends. The one located on the gentle slope portion side is characterized in that a waterproof rib extending in the axial direction toward the gentle slope portion and projecting from the gentle slope portion is formed.

  In the sirocco fan manufacturing method according to the present invention, the ventilation opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion and a pair of axial opening ends extending in the axial direction. The pair of circumferentially open end portions are respectively positioned so as to be shifted at least by the thickness of the disk portion along the radial direction of the disk portion, and the disk portion and the plurality of blade portions are shafts of the disk portion. It is characterized in that resin is injected into a cavity formed by clamping a pair of molds that are close to and away from each other along the direction, and is integrally injection-molded.

  According to the present invention, the disk portion has the vertical surface portion extending in the axial direction from the gentle slope portion, and the ventilation opening is formed at a position where the exhaust surface of the motor faces the vertical surface portion.

  Therefore, the air flowing out from the exhaust opening can directly pass through the ventilation opening without flowing along the inside of the disk portion. As a result, the flow of air becomes smooth, the generation of flow path resistance is reduced, the amount of air passing through the motor is increased, and the cooling efficiency of the motor can be improved.

  Further, since the water droplets flowing along the gentle slope portion flow down in parallel to the vertical surface portion, it is difficult to enter the ventilation opening formed in the vertical surface portion, and it is possible to prevent the water droplet from entering the motor.

  Further, among the pair of axial opening ends of the ventilation opening, at least the one located on the inlet side in the rotational direction is formed with a rib that protrudes toward the blade, so that with the rotation of the sirocco fan, A negative pressure space is generated along the surface on the outlet side in the rotation direction of the rib.

  Here, of the pair of axial opening ends, the surface on the outlet side in the rotational direction of the rib located on the inlet side in the rotational direction is located inside the ventilation opening.

  Therefore, the air passing through the ventilation opening is drawn into the negative pressure space, and the flow of air can be further smoothed to improve the cooling efficiency of the motor.

  In addition, when ribs are formed on each of the pair of axial opening ends, it is possible to reliably prevent the ingress of water droplets from the axial opening end side of the ventilation opening. And what is located in the entrance side of a rotation direction makes it protrude more largely can suppress the air resistance which generate | occur | produces with a rib, and can prevent the fall of the rotational efficiency of a sirocco fan.

  Further, among the pair of circumferential opening ends of the vent opening, those located on the gentle slope portion side are formed with waterproof ribs extending in the axial direction and projecting from the gentle slope portion. Since the water droplets that have flown along the waterproof rib flow so as to avoid the ventilation openings, it is possible to reliably prevent the water droplets from entering the ventilation openings.

  The pair of circumferential opening ends of the ventilation openings are shifted at least by the thickness of the disk portion along the radial direction of the disk portion, and the pair of molds are moved close to and away from each other along the axial direction of the disk portion. Since the disk portion and a large number of blade portions can be integrally formed, a sirocco fan can be easily manufactured.

  The best mode of the sirocco fan according to the present invention will be described with reference to the drawings.

  The electric fan device F shown in FIG. 1 is used for cooling a radiator, a condenser, and the like of an automobile not shown.

  The electric fan device F includes a brassless motor (motor) 10 and a sirocco fan 20 driven by the brushless motor 10.

  The brushless motor 10 includes a rotating shaft 12 erected so as to be rotatable from the electric circuit board 11, a stator 13 provided coaxially with the rotating shaft 12, and an electric circuit board 11 provided integrally with the rotating shaft 12. And a rotor 14 that rotates around the stator 13 at a predetermined interval.

  That is, the brushless motor 10 is a so-called outer rotor type brushless motor in which a rotor 14 as a rotor is disposed outside a stator 13 as a stator.

  The electric circuit board 11 is provided with wiring patterns such as a drive circuit and a control circuit (not shown), an electrolytic capacitor 11a, and the like, and is accommodated in a circuit protection case 11b.

  A boss portion 11c is formed in the upper case 11b ′ of the circuit protection case 11b, and one end portion 12a of the rotating shaft 12 is inserted into the boss portion 11c.

  The rotary shaft 12 is rotatably held by a shaft holding portion 11d rising from the boss portion 11c of the circuit protection case 11b via the bearing portion 12b, so that the rotary shaft 12 is attached to the electric circuit board 11. And can be rotated.

  In addition, the sensor magnet 15 is being fixed to the one end part 12a of the rotating shaft 12 inserted in the circuit protection case 11b. The sensor magnet 15 detects the rotational position of a permanent magnet 14a of the rotor 14 described later in cooperation with a hall element (not shown) mounted on the electric circuit board 11.

  The stator 13 has a core 13a in which thin metal plates are laminated, and a coil 13b wound around the core 13a.

  Here, the core 13a is being fixed to the outer periphery of the axis | shaft holding | maintenance part 11d which supports the rotating shaft 12 rotatably via the bearing part 12b. As a result, the stator 13 is provided coaxially with the rotary shaft 12.

  The rotor 14 includes a yoke 14 b that covers the stator 13, and a plurality of permanent magnets 14 a that are held inside the yoke 14 b and are arranged close to the outside of the stator 13.

  The yoke 14b includes a cylindrical main body 16a, a closing surface 16b that closes one end of the main body 16a, and an inclined surface 16c that is inclined so as to chamfer between the main body 16a and the closing surface 16b. have.

  The yoke 14b has the open end 17 which is the other end of the main body 16a directed toward the circuit protection case 11b, and a predetermined interval is provided between the circuit protection case 11b and the open end 17. The central portion 16 b ′ of the closing surface portion 16 b is penetrated and fixed to the rotating shaft 12.

  Further, a plurality of exhaust openings 18,... Are formed in the closed surface portion 16b and the inclined surface portion 16c, respectively.

  The exhaust opening 18 is a portion from which air passing between the stator 13 and the rotor 14 from the open end 17 of the yoke 14b on the electric circuit board 11 side, that is, the inside of the yoke 14b is discharged.

  On the other hand, the plurality of permanent magnets 14a,... Are attached to the inner peripheral surface of the main body portion 16a of the yoke 14b surrounding the stator 13 with different magnetic poles arranged alternately along the circumferential direction of the main body portion 16a. ing.

  As a result, the rotor 14 is disposed coaxially with the rotating shaft 12 and the stator 13 and is formed between the open end 17 of the yoke 14b and the circuit protection case 11b by the magnetic interaction between the permanent magnet 14a and the stator 13. It is possible to rotate integrally with the rotary shaft 12 with an interval.

  That is, the rotor 14 is provided integrally with the rotating shaft 12 and rotates around the stator 13 with a predetermined distance from the electric circuit board 11 in the circuit protection case 11b.

  The sirocco fan 20 covers the brushless motor 10 and is fixed to the rotary shaft 12. The sirocco fan 20 has a large number of blade portions 22 erected in the axial direction from an outer edge portion 26 a of a connecting ring portion 26, which will be described later. ...

  As shown in FIGS. 1 and 2, the disk portion 21 includes a shaft coupling portion 23 fixed to the rotary shaft 12, a gentle slope portion 24 extending from the periphery of the shaft coupling portion 23, and a gentle slope portion 24. It has a vertical surface portion 25 and a connecting ring portion 26 extending from the vertical surface portion 25.

  The shaft coupling portion 23 has a cylindrical shape having a through hole 23a through which the rotary shaft 12 is fixed. A plurality of reinforcing pieces 23b,... Are formed between the root of the shaft coupling portion 23 and the gentle slope portion 24.

  The gentle slope portion 24 is gently inclined from the shaft coupling portion 23 toward the root portion 22 a of each blade portion 22. The gentle slope portion 24 is curved in an R shape. The gentle slope portion 24 is located above the brushless motor 10 in FIG. 1 and has a diameter larger than the outer diameter of the yoke 14b of the brushless motor 10. Thereby, the brushless motor 10 is accommodated below the gentle slope portion 24.

  The vertical surface portion 25 extends along the axial direction from the gentle slope portion 24 and has a cylindrical shape surrounding the brushless motor 10.

  The vertical surface portion 25 is formed with a plurality of ventilation openings 30 arranged in the circumferential direction at a predetermined interval.

  Each ventilation opening 30 is a portion through which air flowing out from the plurality of exhaust openings 18, formed in the yoke 14b passes, and is formed at a position where any one of the plurality of exhaust openings 18,. .

  The “position where the exhaust opening 18 faces” is a position that is arranged in the same radial direction as the exhaust opening 18 and through which the air discharged from the exhaust opening 18 can be passed directly.

  Furthermore, each ventilation opening 30 is surrounded on all sides by a pair of circumferential opening ends 31a and 31b along the circumferential direction of the disk portion 21 and a pair of axial opening ends 32a and 32b along the axial direction. It has a rectangular shape. Here, each ventilation opening 30 has a pair of axial opening ends 32a and 32b that are longer than the pair of circumferential opening ends 31a and 31b, and has a rectangular shape extending in the axial direction. Yes.

  Of the pair of axially open end portions 32a and 32b, the one located on the inlet side in the rotational direction of the sirocco fan 20 (here, the axially open end portion 32a located on the left side in FIG. 3) includes a disk. Large ribs 33a projecting toward a large number of blade portions 22, surrounding the portion 21 are formed. Of the pair of axially open end portions 32a and 32b, the one located on the outlet side in the rotational direction of the sirocco fan 20 (here, the axially open end portion 32b located on the left side in FIG. 3) includes a disk. Small ribs 33b projecting toward a large number of blade portions 22,... Surrounding the portion 21 are formed.

  Here, the “inlet side in the rotational direction” refers to the direction of rotation when the sirocco fan 20 rotates, and the “exit side in the rotational direction” refers to the opposite side of the direction of rotation. The rotation direction is the direction indicated by the arrow P in FIG.

  Both the large rib 33a and the small rib 33b protrude along the radial direction of the disk portion 21, and are orthogonal to the vertical surface portion 25 (see FIG. 3). Further, the protruding length of the large rib 33a is larger than the protruding length of the small rib 33b. That is, the large rib 33a protrudes larger than the small rib 33b.

  Of the pair of circumferentially open end portions 31a and 31b, the one located on the gentle slope portion 24 side (here, the circumferentially open end portion 31a located on the upper side in FIG. 1) has a gentle slope portion 24. Waterproof ribs 34 extending toward the surface are formed.

  The waterproof rib 34 is along the axial direction and protrudes from the gentle slope portion 24. Further, both ends in the circumferential direction of the waterproof rib 34 are integrally connected to the large rib 33a and the small rib 33b. That is, three sides of the ventilation opening 30 are surrounded by the large ribs 33a, the small ribs 33b, and the waterproof ribs 34 and are partitioned from the vertical surface portion 25.

  Further, the pair of circumferentially open end portions 31 a and 31 b are positioned so as to be shifted by the thickness of the disk portion 21 along the radial direction of the disk portion 21. Here, the circumferential open end 31a located on the upper side in FIG. 1 is located on the inner side (center side).

  The connection ring portion 26 is annularly expanded while being inclined so as to gradually become horizontal from the vertical surface portion 25, and the outer edge portion 26 a is integrated with the root portions 22 a of many blade portions 22.

  In the disk portion 21 shown in FIG. 1, a plurality of first reinforcing ribs 24 a extending in the radial direction are formed on the inner side surface of the gentle slope portion 24 so as to project toward the inside of the disk portion 21, and A plurality of second reinforcing ribs 26 b are formed on the inner surface of the ring portion 26 so as to protrude toward the inside of the disk portion 21.

  The first reinforcing ribs 24a,... Can increase the mounting strength of the disk portion 21 to the rotary shaft 12, and the second reinforcing ribs 26b,.

  A large number of blade portions 22,... Are fixed to the outer edge portion 26a of the coupling ring portion 26 of the disk portion 21, respectively, and are arranged at intervals in the circumferential direction of the outer edge portion 26a. It is formed so as to extend parallel to the shaft 12. In addition, the front-end | tip part 22b of each blade | wing part 22 is connected by the ring member 22c.

  Next, the operation of the sirocco fan 20 according to the present invention will be described.

  First, the sirocco fan 20 is formed by injection molding using a molding die 40 including a fixed molding die 41 and a movable molding die 42 as shown in FIGS. 4 and 5.

  FIG. 4 shows a state in which the molding die 40 is opened. A fixed molding die 41 is shown below, and a movable molding die 42 is shown above. In the center, a molded sirocco fan is shown.

  Forming surfaces 41 a and 42 a are formed on the opposing surfaces of the fixed mold 41 and the movable mold 42, respectively. Further, the movable mold 41 is formed with a gate (not shown), which is an injection port for molten resin, at a position directly facing the cavity 43 (see FIG. 5), and is a direct gate type.

  In order to form the sirocco fan 20, first, the movable mold 42 is brought close to the fixed mold 41, the fixed mold 41 and the movable mold 42 are engaged, the mold 40 is closed, and the molding surface is closed. A cavity 43 is formed between 41a and 42a.

  Here, in the sirocco fan 20, the positions of the circumferential opening ends 31 a and 31 b of the ventilation opening 30 formed in the disk portion 21 are shifted by the thickness of the disk portion 21 along the radial direction of the disk portion 21. Yes.

  Therefore, the split surface of the molding die 40, that is, the mating surface of the molding surface 41a of the fixed molding die 41 and the molding surface 42a of the movable molding die 42 does not enter the inside of the disk portion 21, and the movable molding die 42 is inserted into the sirocco. The fan 20 can be moved along the axial direction.

  Further, at this time, the disk portion 21 and the large number of blade portions 22,... Are integrated with each other in the connecting ring portion 26, so that the disk portion 21 and the large number of blade portions 22,. Become.

  Next, molten resin is injected into the cavity 43 from a gate (not shown). This molten resin is a known thermoplastic resin such as polypropylene or polyethylene.

  Finally, after the mold 40 is cooled, the movable mold 42 is separated along the axial direction of the sirocco fan 20, the mold 40 is opened, and the molded sirocco fan 20 is taken out.

  In this way, by moving the movable mold 42 close to and away from the fixed mold 41 along the axial direction of the disk portion 21, the mold 40 is opened and closed, and the disk portion 21 and the numerous blade portions 22,. Can be integrally molded. Therefore, the sirocco fan 20 can be injection-molded by the pair of molds 40 and can be easily manufactured.

  Next, the case where it blows with the sirocco fan 20 which concerns on this invention is demonstrated.

  In the electric fan device F, the coil 13b of the stator 13 is alternately energized from the electric circuit board 11 based on the position of the permanent magnet 14a of the rotor 14 detected by the sensor magnet 15 fixed to the rotating shaft 12. . Thereby, a rotating magnetic field is generated in the permanent magnet 14a of the rotor 14, and the yoke 14b, the rotating shaft 12, and the sirocco fan 20 rotate integrally.

  At this time, as the sirocco fan 20 rotates, a space (hereinafter referred to as a suction space) S1 between the open end 17 of the yoke 14b and the connecting ring portion 26 of the disk portion 21 of the sirocco fan 20 and the circuit protection case 11b. Becomes a high pressure, and a space (hereinafter referred to as an exhaust space) S2 between the disk portion 21 and the plurality of blade portions 22,.

  Therefore, there is a flow in which air moves from the suction space S1 having a high pressure toward the exhaust space S2 having a negative pressure. In addition, air from outside air is sucked in from the front end portions 22b side of the large number of blade portions 22, flows along the gentle slope portion 24, and flows into the exhaust space S2.

  At this time, the air from the suction space S1 flows into the main body portion 16a of the yoke 14b from the open end 17 of the main body portion 16a opened toward the circuit protection case 11b, and is formed in the closed surface portion 16b and the inclined surface portion 16c. Then, after being discharged from the plurality of exhaust openings 18,..., It moves to the exhaust space S2 through the plurality of ventilation openings 30,.

  Further, the air from the outside air flows along the gentle slope portion 24, and then merges with the air that has passed through each ventilation opening 30 and flows into the exhaust space S2.

  Here, each ventilation opening 30 is formed in the vertical surface part 25 of the disk part 21, and any one of the exhaust openings 18 faces.

  Thus, the air flowing out from each exhaust opening 18 can directly flow through the ventilation opening 30 and flow out into the exhaust space S2 without flowing along the inside of the disk portion 21. Therefore, the flow of air from the inside of the yoke 14b toward the outside of the disk portion 21 is smoothed to reduce the generation of flow path resistance, the amount of air flowing through the yoke 14b is increased, and the cooling efficiency of the brushless motor 10 is improved. Can be achieved.

  Further, the water droplets flowing along the gentle slope portion 24 flow down in parallel to the vertical surface portion 25. On the other hand, the ventilation opening 30 is formed in the vertical surface portion 25 extending along the axial direction. Therefore, the ventilation opening 30 is positioned in parallel to the water droplets flowing down, making it difficult for water droplets to enter the ventilation opening 30, and the water droplets enter the brushless motor 10 from the exhaust opening 18 formed in the yoke 14 b. Can be prevented.

  In particular, here, the gentle slope portion 24 is located above the brushless motor 10 and has a diameter larger than the outer diameter of the yoke 14b of the brushless motor 10, and the brushless motor 10 is located below the gentle slope portion 24. Is housed in.

  As a result, the water droplets that have flowed along the gentle slope portion 24 are more unlikely to drop toward the brushless motor 10, and it is possible to prevent the occurrence of problems with the brushless motor 10.

  Furthermore, the outside air flows along the gentle slope portion 24 and joins the air that has passed through the ventilation opening 30 and flows into the exhaust space S2, so that the pressure distribution of the wind pressure in the exhaust space S2 is The vicinity of the boundary with the vertical surface portion 25 is the highest.

  Therefore, the ventilation opening 30 formed in the vertical surface portion 25 can be provided at a position facing the portion where the wind pressure is highest in the exhaust space S2, and the air from the ventilation opening 30 can be further easily passed. The cooling efficiency of the brushless motor 10 can be improved.

  Of the pair of axially open end portions 32a and 32b, the axially open end portion 32a located on the inlet side in the rotational direction of the sirocco fan 20 is formed with a large rib 33a. A small rib 33b is formed at the axially open end 32b located on the side.

  As a result, when the sirocco fan 20 rotates, a negative pressure space K is generated along the surface on the exit side in the rotation direction of the large rib 33a (35 in FIG. 3). That is, the large rib 33a changes the air flow along the surface of the disk portion 21 so as to be directed outward of the disk portion 21, and as a result, the negative rib along the surface 35 on the outlet side in the rotation direction of the large rib 33a. A pressure space is created.

  Here, the surface 35 on the outlet side in the rotational direction of the large rib 33 a is located inside the ventilation opening 30.

  Therefore, when the air in the disk portion 21 passes through the ventilation opening 30, it is drawn into the negative pressure space K, and the air flow is further smoothed to further improve the cooling efficiency of the brushless motor 10. It becomes possible.

  Further, since the large rib 33a and the small rib 33b protrude from the vertical surface portion 25, water droplets flowing through the vertical surface portion 25 are blocked by the large rib 33a and the small rib 33b, and from the axially open end portions 32a and 32b side. Intrusion into the ventilation opening 30 can be reliably prevented.

  On the other hand, of the pair of circumferential opening end portions 31a and 31b, the circumferential opening end portion 31a located on the gentle slope portion 24 side is formed with a waterproof rib 34 that extends in the axial direction and protrudes from the gentle slope portion 24. Has been.

  As a result, water droplets that flow along the gentle slope portion 24 from the vicinity of the shaft coupling portion 23 are blocked by the waterproof ribs 34 and flow so as to avoid the ventilation openings 30, and the water drops enter the ventilation openings 30. Can be surely prevented.

  As mentioned above, although embodiment concerning this invention has been explained in full detail with drawing, a concrete structure is not restricted to the above-mentioned embodiment. Design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the above-described embodiment, the large rib 33a and the small rib 33b are formed in each of the pair of axial opening end portions 32a and 32b of the ventilation opening 30, but only the large rib 33a may be formed. .

  In this case, air resistance due to the small ribs 33b does not occur, and the blowing efficiency of the sirocco fan can be improved.

  Further, in the above-described embodiment, the ventilation opening 30 has a rectangular shape along the axial direction. However, the ventilation opening 30 may be arbitrarily selected according to the amount of air passing through the brushless motor 10, the rotation speed of the sirocco fan 20, the rotation speed, and the like. It can be formed into a shape.

  Even in this case, a large rib is provided at the end of the sirocco fan 20 that is positioned on the inlet side in the rotational direction, or a waterproof rib that extends in the axial direction and protrudes from the gentle slope is provided. And the waterproof property can be improved.

  Further, in the above-described embodiment, the electric fan device F is used for cooling an automobile radiator or the like. However, the electric fan device F according to the present invention is not limited to that for an automobile. It can also be used for other vehicles such as trains, industrial equipment other than vehicles, and the like.

It is a longitudinal cross-sectional view which shows the electric fan apparatus which concerns on this invention. It is a perspective view which shows the disc part of the sirocco fan based on this invention. It is AA sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the state which opened the shaping | molding die which manufactures the sirocco fan based on this invention. It is a longitudinal cross-sectional view which shows the state which closed the shaping | molding die which manufactures the sirocco fan based on this invention.

Explanation of symbols

10 Brushless motor (motor)
12 Rotating shaft 18 Exhaust opening 20 Sirocco fan 21 Disk portion 22 Blade portion 23 Coupling shaft portion 24 Slope portion 25 Vertical surface portion 26 Connecting ring portion (outer edge portion)
30 Ventilation opening

Claims (5)

A disk portion that covers the motor and is fixed to the rotation shaft of the motor and has a ventilation opening through which air that has flowed out from the exhaust opening of the motor passes, and an axially extending from the outer edge of the disk portion. A sirocco fan comprising a large number of blade portions surrounding the disk portion and rotating integrally with the rotating shaft,
The disk portion includes a shaft coupling portion fixed to the rotating shaft, a gentle slope portion that gently slopes from the periphery of the shaft coupling portion toward the outer edge portion, and extends from the gentle slope portion along the axial direction. A vertical surface portion,
The sirocco fan, wherein the ventilation opening is formed in a position where the vertical surface portion faces the exhaust opening. The ventilation opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion, and a pair of axial opening ends extending in the axial direction,
2. The rib according to claim 1, wherein ribs protruding toward the plurality of blade portions are formed at least on the inlet side in the rotational direction of the pair of axially open end portions. Sirocco fan.   The rib is formed so as to protrude from each of the pair of axial opening ends, and the rib located on the inlet side in the rotation direction protrudes larger than the rib located on the outlet side in the rotation direction. The sirocco fan according to claim 2. The ventilation opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion, and a pair of axial opening ends extending in the axial direction,
Among the pair of circumferential opening end portions, those located on the gentle slope portion side are formed with waterproof ribs extending in the axial direction toward the gentle slope portion and projecting from the gentle slope portion. The sirocco fan as described in any one of Claims 1-3 characterized by the above-mentioned. It is a manufacturing method of the sirocco fan as described in any one of Claims 1-4,
The ventilation opening has a pair of circumferential opening ends extending in the circumferential direction of the disk portion, and a pair of axial opening ends extending in the axial direction,
The pair of circumferential opening ends are respectively positioned so as to be shifted at least by the thickness of the disk portion along the radial direction of the disk portion,
The disk part and the plurality of blade parts are integrally injection-molded by injecting resin into a cavity formed by clamping a pair of molds that are close to and away from each other along the axial direction of the disk part. A method of manufacturing a sirocco fan.

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