Fan device

Abstract

A plurality of stationary vanes (33) provided to a fan device (100) include a first stationary vane (331). At least a portion of the radial outer end part of the first stationary vane is connected to an enlarged diameter surface (322). The radial outer end part of the first stationary vane and the enlarged diameter surface of a cylindrical outer frame body (32) overlap with a space interposed therebetween. The outer frame body surrounds an impeller, a motor, and the like, and extends axially. The enlarged diameter surface is a portion of the inner circumferential surface of the outer frame body and expands radially outward toward one side in the axial direction. A pedestal part (35) extending toward one side in the axial direction from the enlarged diameter surface is disposed in said space. A recessed part (34) recessed from one end in the axial direction of the first stationary vane toward the other side in the axial direction is disposed at the radial outer end part which is at least a portion of the plurality of stationary vanes. The radial inner end part of the recess is disposed radially inward of a cylindrical surface.

Description

Fan unit

[0001] The present invention relates to a fan device.

[0002] Conventionally, stator blades are arranged at the outlet side of the wind tunnel of a fan device to prevent the airflow from expanding in a direction perpendicular to the flow direction. Furthermore, to increase the airflow efficiency of the fan device, an expanding surface that expands radially outward toward the outlet side of the wind tunnel is arranged at the outlet side of the wind tunnel. For example, in an axial flow fan, the stator blades are arranged between the frame case and the motor base. One end of the stator blade is connected to the motor base. The other end of the stator blade (the outer edge of the stator blade) is connected to the inner wall of a cylindrical channel inside the case. In an axial flow fan, an expanding portion is arranged at the wind outlet of the case (corresponding to the outlet of the wind tunnel) to increase the outflow area of ​​the airflow (see, for example, Japanese Patent Application Laid-Open No. 2006-63972).

[0003] In JP 2006-63972 A, the outlet side portion of the stator vane is not connected to the inner surface of the expanded portion (corresponding to the expanded diameter surface), which may result in the stator vane being unable to fully rectify the airflow.

[0004] In addition, at least a portion of the stator vane is generally disposed at an inclination in the circumferential direction with respect to the axial direction. Therefore, when the outlet-side portion of the stator vane is connected to the inner surface of the expanded portion, a blind spot is formed between the stator vane and the inner surface of the expanded portion in the axial direction. Therefore, when the stator vane, case, and expanded portion are molded using a simple mold, a member (for example, called a pedestal) that fills the blind spot is disposed between the stator vane and the inner surface of the expanded portion in the axial direction.

[0005] Japanese Patent Application Laid-Open No. 2006-63972

[0006] However, the pedestal portion arranged as described above is likely to interfere with and obstruct the airflow that flows near the inner surface of the expanded portion, which may result in problems such as reduced airflow efficiency and noise from the fan device.

[0007] An object of the present invention is to suppress reduction in air blowing efficiency and noise caused by the arrangement of a pedestal portion between a stator vane and a radially expanded surface.

[0008] An exemplary fan apparatus according to the present invention includes a support, a cylindrical outer frame, and a plurality of stator vanes. The support is disposed axially on one side of a motor that rotates an impeller about a rotation axis extending in the axial direction, and supports the motor. The outer frame extends in the axial direction, surrounding the impeller, the motor, and the support. The stator vanes extend at least radially from the support and are connected to an inner circumferential surface of the outer frame, and expand in one circumferential direction as they extend in the other axial direction. The inner circumferential surface of the outer frame includes a cylindrical surface and a diverging surface. The cylindrical surface extends in the axial direction. The diverging surface expands radially outward as it extends from one axial end of the cylindrical surface toward the one axial direction. The plurality of stator vanes include first stator vanes. At least a portion of a radially outer end of the first stator vane is connected to the diverging surface. The radially outer end of the first stator vane and the diverging surface overlap with a gap. A pedestal portion extending from the expanded diameter surface in one axial direction is disposed in the gap. A recess is disposed at a radially outer end portion of at least some of the first stator vanes among the plurality of stator vanes. The recess is recessed from one axial end portion of the first stator vane to the other axial end portion. A radially inner end portion of the recess is disposed radially inward from the cylindrical surface.

[0009] Further features and advantages of the present invention will become more apparent from the following embodiments.

[0010] According to the exemplary fan device of the present invention, it is possible to suppress a reduction in air blowing efficiency and noise caused by the arrangement of the base portion between the stator blade and the diverging surface.

[0011] Fig. 1 is a cross-sectional view showing an example of the configuration of a fan device according to an embodiment. Fig. 2 is a perspective view of the fan device. Fig. 3 is a perspective view showing an example of the configuration of one axial side of a housing. Fig. 4 is a plan view of the housing as viewed from one axial side toward the other axial side. Fig. 5 is a cross-sectional view of a stator blade as viewed in the direction in which the stator blade extends.

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] In this specification, in the fan device 100, the direction parallel to the rotation axis J of the impeller 1, which will be described later, is referred to as the "axial direction D." Within the axial direction D, the direction from the impeller 1 toward the support 31 is referred to as the "one axial direction Da," and the direction from the support 31 toward the impeller 1 is referred to as the "other axial direction Db." Additionally, the direction perpendicular to the rotation axis J is referred to as the "radial direction." Within the radial direction, the direction approaching the rotation axis J is referred to as the "radial inward direction," and the direction away from the rotation axis J is referred to as the "radial outward direction." Additionally, the rotation direction centered on the rotation axis J is referred to as the "circumferential direction Dc."

[0014] In this specification, the term "annular" includes not only a shape that is continuous and uninterrupted throughout the entire circumferential area centered on the rotation axis J, but also a shape that has one or more interruptions in a portion of the entire circumferential area centered on the rotation axis J. The term "annular" also includes a shape that describes a closed curve on a curved surface that intersects with the rotation axis J, centered on the rotation axis J.

[0015] Furthermore, in the positional relationship between any one of a direction, a line, and a plane and any other, "parallel" includes not only a state in which the two do not intersect at all no matter how far they are extended, but also a state in which they are substantially parallel. Furthermore, "perpendicular" and "orthogonal" each include not only a state in which the two intersect at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal. In other words, "parallel," "perpendicular," and "orthogonal" each include a state in which there is an angular deviation in the positional relationship between the two to an extent that does not deviate from the spirit of the present invention.

[0016] It should be noted that these are used merely for the purpose of explanation and are not intended to limit the actual positional relationship, direction, names, etc.

[0017] 1. Embodiment Fig. 1 is a cross-sectional view showing an example of the configuration of a fan device 100 according to an embodiment. Fig. 2 is a perspective view of the fan device 100. Note that Fig. 1 shows the cross-sectional structure when the fan device 100 is virtually cut along a plane including the two-dot chain line II and the rotation axis J in Fig. 2.

[0018] <1-1. Fan device 100> The fan device 100 is a so-called axial fan, and draws in an airflow (i.e., air) through an inlet 101 and sends it out through an outlet 102. However, without being limited to this example, the fan device 100 may draw in and send out fluids such as gases and liquids other than air. The fan device 100 is used, for example, as a cooling fan for electronic devices that are required to be thin. However, the use of the fan device 100 is not limited to this example.

[0019] The fan device 100 includes an impeller 1 , a motor 2 , and a housing 3 .

[0020] <1-2. Impeller 1> The impeller 1 is rotatable around a rotation axis J (i.e., in the circumferential direction) that is centered on a rotation axis J that extends in the axial direction D. The impeller 1 includes a hub 11 and a plurality of rotor blades 12.

[0021] The hub 11 is a covered cylindrical shape extending in the axial direction D. One axial end of the hub 11 is open. In this specification, a shape in which one end of a cylindrical body (for example, a cylindrical portion 112 described later) is covered with a cover-shaped body (for example, a plate portion 111 described later) is referred to as a "covered cylindrical shape."

[0022] The hub 11 has a plate portion 111 and a cylindrical portion 112. The plate portion 111 is circular and extends radially outward from the rotation axis J. In other words, the rotation axis J passes through the center of the plate portion 111. The cylindrical portion 112 extends from the radial outer end of the plate portion 111 in one axial direction Da and surrounds at least a portion of the motor 2 on the other axial direction Db side. One axial end of the cylindrical portion 112 is open. On the other hand, the other axial end of the cylindrical portion 112 is covered by the plate portion 111.

[0023] The multiple rotor blades 12 are arranged on the radially outer side surface of the hub 11 and are lined up in the circumferential direction. Each rotor blade extends at least radially outward from the radially outer surface of the cylindrical portion 112 and is rotatable around the rotation axis J together with the shaft 21 of the motor 2. When the motor 2 rotates the rotor blades 12 in the circumferential direction, the airflow flows in one axial direction Da.

[0024] <1-3. Motor 2> The motor 2 is a drive source for the impeller 1 and is attached to the impeller 1. Specifically, the motor 2 is disposed on one axial side Da of the plate portion 111. The motor 2 rotates the impeller 1 around a rotation axis J extending in the axial direction D. At least a portion of the motor 2 is disposed inside the impeller 1 (particularly the hub 11 described below).

[0025] The motor 2 has a shaft 21. The shaft 21 extends in the axial direction D along a rotation axis J that extends in the axial direction D. The shaft 21 is rotatable together with the impeller 1 about the rotation axis J. More specifically, the impeller 1 is coupled to the other axial end of the shaft 21. The motor 2 rotates the shaft 21 about the rotation axis J. As a result, the motor 2 rotates the impeller 1 together with the shaft 21.

[0026] The motor 2 further includes a substrate 22. The substrate 22 is disposed on one axial side Da of the motor 2 and on the other axial side Db of the support body 31. That is, the substrate 22 is attached to the surface of the support body 31 on the other axial side Db. The substrate 22 is electrically connected to leads (reference numeral omitted) drawn from the stator 23 of the motor 2. A drive circuit for the motor 2 and the like are mounted on the substrate 22. The substrate 22 is also electrically connected to external wiring 221. The external wiring 221 is drawn to the outside of the fan device 100 and electrically connects the substrate 22 to external devices, power sources, and the like.

[0027] <1-4. Housing 3> Next, an example configuration of the housing 3 will be described using FIGS. 1 to 4 as an example. FIG. 3 is a perspective view showing an example configuration of the housing 3 on one axial direction Da side. FIG. 4 is a plan view of the housing 3 as viewed from one axial direction Da side toward the other axial direction Db. In FIG. 4, dashed line C1 indicates an imaginary circle centered on the rotation axis J and passing through the radially inner ends of the recesses 34 of the stator vanes 33 other than the second stator vanes 332 described below. Dashed line C2 indicates (one axial end of) a cylindrical surface 321 described below. Dashed line C3 indicates the outer edge of one axial end of an imaginary truncated cone at the same axial position as one axial end of an outer frame body 32 described below. This imaginary truncated cone extends in the axial direction around the rotation axis J and expands radially outward toward one axial direction Da. As described below, the side surface of the imaginary truncated cone follows the expanding diameter surface 322.

[0028] As shown in FIGS. 1 to 4 , the housing 3 includes a support body 31 , an outer frame body 32 , and stator blades 33 .

[0029] The support 31 is disposed on one side in the axial direction Da of the motor 2 and supports the motor 2. That is, the fan device 100 includes the support 31. For example, the support 31 extends from the rotation axis J in a direction intersecting the axial direction D, for example, extends from the rotation axis J in a radial direction.

[0030] The outer frame 32 has a cylindrical shape extending in the axial direction D and surrounds the impeller 1, the motor 2, and the support 31. That is, the fan device 100 includes the outer frame 32. The outer frame 32 faces the impeller 1, the motor 2, and the support 31 in the radial direction with a gap therebetween. The outer frame 32 forms an air channel 103 through which air flows in the space between the outer frame 32 and the impeller 1, the motor 2, and the support 31.

[0031] The inner peripheral surface of the outer frame body 32 includes a cylindrical surface 321, a diameter expansion surface 322, and a flat surface 323. The cylindrical surface 321 extends in the axial direction D, is located in the axial center of the inner peripheral surface of the outer frame body 32, and surrounds the impeller 1 and other components (see dashed line C2 in FIG. 4 ). The cylindrical surface 321 has a continuous cylindrical shape along the circumferential direction. The inner diameter of the cylindrical surface 321 may be constant along the axial direction D or may decrease toward the one axial direction Da. The diameter expansion surface 322 and the flat surface 323 are located closer to the one axial direction Da than the cylindrical surface 321. The diameter expansion surface 322 is a curved surface that follows the side surface of an imaginary truncated cone (see dashed line C3 in FIG. 4 ) centered on the rotation axis J. Note that the side surface of the imaginary truncated cone extends from one axial end of the cylindrical surface 321 toward the one axial direction Da. The diameter of the cylindrical surface 321 increases from the axial end of the cylindrical surface 321 toward the axial direction Da.

[0032] In this embodiment, a portion of the side surface of the imaginary truncated cone is located outside the outer surface of the outer frame body 32. Therefore, the expanded diameter surface 322 cannot be arranged on the portion of the side surface of the imaginary truncated cone that is located outside the outer surface of the outer frame body 32. Furthermore, if the expanded diameter surface 322 were arranged until it reached the outer surface of the outer frame body 32, the portion of the outer surface of the outer frame body 32 that is located inside the side surface of the imaginary truncated cone would become an opening. Therefore, to prevent an opening from being arranged in the above-mentioned portion of the outer surface of the outer frame body 32, a flat surface 323 is arranged on the inner surface of this portion. The flat surface 323 extends in the axial direction D and extends parallel to the outer surface of the outer frame body 32 at a predetermined interval.

[0033] However, the examples of this embodiment do not exclude a configuration in which the inner circumferential surface of the outer frame body 32 does not include the flat surface 323. For example, if the outer edge (see dashed line C3 in FIG. 4 ) of one axial end of the above-described imaginary truncated cone, on whose side the expanded diameter surface 322 is arranged, is inscribed in the outer edge of one axial end of the outer frame body 32, the flat surface 323 may not be arranged on the inner circumferential surface of the outer frame body 32. Similarly, if the flat surface 323 is located radially inward from the outer edge of one axial end of the outer frame body 32, the flat surface 323 may not be arranged on the inner circumferential surface of the outer frame body 32. In these cases, a continuous annular expanded diameter surface 322 may be arranged on the inner circumferential surface of the outer frame body 32 on the one axial direction Da side of the cylindrical surface 321.

[0034] The plurality of stator vanes 33 extend from the support body 31 in at least the radial direction and are connected to the inner peripheral surface of the outer frame body 32. As they extend in the other axial direction Db, they expand toward one side of the circumferential direction Dc. The fan device 100 is equipped with the plurality of stator vanes 33. The plurality of stator vanes 33 are arranged side by side in the circumferential direction Dc on one axial direction Da side of the air tunnel 103. Each stator vane 33 straightens the airflow flowing through the air tunnel 103. Furthermore, the stator vanes 33 connect the radial outer end of the support body 31 and one axial end of the outer frame body 32.

[0035] In the present embodiment, the support body 31, the outer frame body 32, and the stator blades 33 may be integral and form a single member. However, this is not limiting, and at least one of these members may be separate from the other members.

[0036] The housing 3 also has a recess 34. The recess 34 is disposed at the radially outer end of one axial end of at least some of the multiple stator vanes 33 (for example, at least one first stator vane 331 described below). In the present embodiment, the recess 34 is disposed in all of the stator vanes 33. The recess 34 is recessed from one axial end of the stator vane 33 toward the other axial direction Db. Viewed from another perspective, the recess 34 is recessed in a direction away from the inner circumferential surface of the outer frame body 32 in the first direction D1 (see FIG. 3 , etc.) in which the stator vane 33 extends.

[0037] The radially inner ends of at least some of the recesses 34 are disposed radially inward from the cylindrical surface 321. For example, in this embodiment, the radially inner ends of all of the recesses 34 are disposed radially inward from the cylindrical surface 321. In other words, the radially inner ends of the recesses 34 are disposed closer to the rotation axis J than the cylindrical surface 321. In other words, when viewed from the axial direction D, the distance between the radially inner ends of the recesses 34 and the rotation axis J is smaller than half the inner diameter of the cylindrical surface 321.

[0038] The "radial inner end" of the recess 34 refers to the same portion of the radial inner end of each recess 34, and in this embodiment, for example, is the axial center portion of the radial inner end of the recess 34. However, without being limited to this example, the "radial inner end" of the recess 34 may be any one of one axial end, the other axial end, and a portion parallel to the axial direction D of the radial inner end of the recess 34.

[0039] This arrangement suppresses noise generated at the radially outer end of the stator vane 33 where the recess 34 is disposed. For example, the airflow near the cylindrical surface 321 of the outer frame body 32 is straightened along the cylindrical surface 321 and sent to the outside of the fan device 100. Therefore, the straightening effect of the stator vane 33 near the radially outer side of the stator vane 33 is low. Therefore, even if the portion on the one axial direction Da side corresponding to the recess 34 (a part of the tip of one axial end of the stator vane 33) is spaced radially inward from the inner circumferential surface of the outer frame body 32, there is almost no effect on the air blowing efficiency of the fan device 100. Furthermore, through extensive research, the inventors have found that noise generated at the tip of the stator vane 33 can be reduced by spacing the tip of one axial end of the stator vane 33 radially inward from the cylindrical surface 321 of the outer frame body 32. Therefore, by arranging the radially inner end of the recess 34 of the stator blade 33 radially inward of the cylindrical surface 321 as in this embodiment, noise at the radially outer end of the stator blade 33 can be suppressed.

[0040] 5 is a cross-sectional view of the stator blade 33 as viewed from the direction in which the stator blade 33 extends. Fig. 5 shows a cross-sectional structure in the case where the stator blade 33 is virtually cut along a plane parallel to the axial direction D along the two-dot chain line VV in Fig. 3.

[0041] Preferably, as shown in FIG. 5 , an R-chamfered portion 330 is disposed at the circumferential end of one axial end of at least one stator vane 33. The R-chamfered portion 330 is a curved surface in which a corner defined by one axial end face and one circumferential end face is R-chamfered (rounded), and extends along the one axial end of the stator vane 33. Preferably, the R-chamfered portion 330 extends from the radially inner end to the radially outer end of the stator vane 33 at the circumferential end of the one axial end of the stator vane 33. More preferably, the R-chamfered portion 330 is also disposed at the circumferential end of the inner surface of the recess 34 (the radially inner end face and the bottom surface facing the one axial direction Da). This reduces the likelihood of turbulence in the airflow near the one axial end of the stator vane 33, thereby suppressing, for example, the generation of turbulence. Therefore, the rectified airflow is more likely to be delivered in the one axial direction Da. This suppresses or prevents a decrease in the blowing efficiency of the fan unit 100.

[0042] More preferably, the radius of curvature r of the R-chamfered portion 330 is greater than or equal to one-third and less than one-half of the thickness d of the stator blade 33 at one axial end. The thickness d is the width of the stator blade 33 at one axial end in a third direction D3 perpendicular to both the first direction D1 (see FIG. 4 ) in which the stator blade 33 extends from the support 31 toward the outer frame 32 and the second direction D2 in which the stator blade 33 extends as viewed from the first direction D1 (see FIG. 5 ). This allows the R-chamfered portion 330 to be formed with precision and sufficiently suppresses or prevents a decrease in the blowing efficiency of the fan unit 100. Note that if the radius of curvature r is less than one-third of the thickness d, it becomes difficult to form the R-chamfered portion 330, which may result in an inaccurate positioning of the R-chamfered portion 330. Furthermore, if the radius of curvature r is greater than half the thickness d, there is a risk that the air blowing efficiency of the fan unit 100 will decrease due to turbulence of the air flow, etc.

[0043] However, the above example does not exclude a configuration in which the radius of curvature r is less than ⅓ of the thickness d of the stator blade 33, nor does it exclude a configuration in which the radius of curvature r is greater than ½ of the thickness d of the stator blade 33. Alternatively, the above example does not exclude a configuration in which the R-chamfered portion 330 is not disposed at the circumferential end at one axial end of all the stator blades 33.

[0044] <1-5. Stator vanes 33> Next, a configuration example of the multiple stator vanes 33 will be described. The multiple stator vanes 33 include first stator vanes 331. That is, at least some of the stator vanes 33 are first stator vanes 331. At least a portion of the radially outer end of the first stator vane 331 is connected to the expanded diameter surface 322 and overlaps with the expanded diameter surface 322 with a gap in the axial direction D. A pedestal portion 35 extending from the expanded diameter surface 322 in one axial direction Da is disposed in this gap. In other words, the radially outer end of the first stator vane 331 and the expanded diameter surface 322 overlap with a gap in the axial direction D. This gap is then completely filled with the pedestal portion 35. The arrangement of the pedestal portion 35 makes it possible to prevent a blind spot in the axial direction D from being formed between the first stator vane 331 and the expanded diameter surface 322 when the housing 3 is molded. Therefore, the first stator vane 331 connected to the expanded diameter surface 322 can be formed by removing the die in the axial direction D without requiring a complicated die such as by using a core. Note that, hereinafter, the above-described "space that becomes a blind spot" may be simply referred to as a "blind spot."

[0045] The base 35 may be disposed only in the blind spot. This allows the volume of the base 35 to be kept to a minimum. This makes it possible to suppress a reduction in the air-blowing efficiency of the fan unit 100 and noise caused by the placement of the base 35.

[0046] Alternatively, a portion of the base portion 35 disposed on one first stator vane 331 may be disposed in the blind spot described above, and the remaining portion may be disposed outside the blind spot and protrude from the expanded diameter surface 322 in the axial direction D. This can improve the connection strength between the first stator vane 331 and the outer frame body 32.

[0047] Furthermore, a recess 34 is arranged at a radially outer end portion at one axial end portion of at least some of the first stator vanes 331 among the plurality of stator vanes 33. In detail, the recess 34 is arranged on at least some of the first stator vanes 331, and for example, the recess 34 is arranged on all of the first stator vanes 331 in the present embodiment.

[0048] The arrangement of the recess 34 reduces the volume of the space that is a blind spot formed between the first stator vane 331 and the expanded diameter surface 322 when viewed from the axial direction D. Therefore, the volume of the pedestal portion 35 that is arranged in the blind spot can be reduced without complicating the mold used to mold the housing 3 (particularly the first stator vane 331). This makes it possible to suppress a reduction in the air blowing efficiency and noise of the fan device 100 that are caused by the arrangement of the pedestal portion 35 between the first stator vane 331 and the expanded diameter surface 322.

[0049] In the stator vane 33 (particularly the first stator vane 331) in which the recess 34 is arranged, a first ratio of the radial position of the radially inner end of the recess 34 to the radial position of the cylindrical surface 321 is preferably 70% or more and 96% or less, and more preferably 90% or more and 96% or less. In detail, the first ratio is the percentage of the distance between the radially inner end of the recess 34 and the rotation axis J to half the inner diameter of the cylindrical surface 321 (the distance between the radially inner end of the expanded diameter surface 322 and the rotation axis J) as viewed in the axial direction D.

[0050] This makes it possible to reduce the volume of the base portion 35 without excessively separating the radially outer end portion at one axial end portion of the first stator vane 331 from the cylindrical surface 321 of the outer frame body 32. Therefore, it is possible to achieve a good balance between reducing the reduction in the air blowing efficiency of the fan device 100 and suppressing noise caused by the arrangement of the base portion 35, and suppressing or preventing a reduction in the rectifying effect of the first stator vane 331.

[0051] If the first ratio is less than 70%, the reduction in the flow straightening effect of the first stator vane 331 has a significant effect, making it difficult to achieve a good balance between the two, and there is a risk of a significant decrease in the air-blowing efficiency of the fan device 100. If the first ratio is greater than 96%, it becomes difficult to form the recesses 34.

[0052] However, the above example does not exclude a configuration in which the first ratio is less than 70% or a configuration in which the first ratio is greater than 96%. In addition, although there are multiple first stator vanes 331 in this embodiment, there may be only one.

[0053] The plurality of stator vanes 33 also includes a second stator vane 332. The second stator vane 332 has external wiring 221 drawn out from the motor 2 arranged thereon. The recess 34 is also arranged at the radially outer end of one axial end of the second stator vane 332. Note that although there is one second stator vane 332 in this embodiment, there may be multiple second stator vanes 332.

[0054] In this embodiment, the radially outer end of the second stator vane 332 is connected to the expanding diameter surface 322, similar to the first stator vane 331. Therefore, a pedestal 35 is arranged on the second stator vane 332. However, without being limited to this example, the radially outer end of the second stator vane 332 may be connected only to the flat surface 323. In this case, the pedestal 35 is not arranged on the second stator vane 332.

[0055] Preferably, the radially inner end of the recess 34 of the second stator vane 332 is positioned radially inward relative to the radially inner end of the recess 34 of a stator vane 33 other than the second stator vane 332 (for example, the first stator vane 331). In this way, the recess 34 of the second stator vane 332 is positioned closer to the support body 31 than the recess 34 of the other stator vane 33 (for example, the first stator vane 331). Therefore, compared to a configuration in which the external wiring 221 is arranged on the first stator vane 331, the wiring distance over which the drawn-out external wiring 221 reaches the recess 34 of the second stator vane 332 can be made shorter. Therefore, the influence of the external wiring 221 on the airflow in the vicinity of the recess 34 can be made smaller.

[0056] More preferably, the external wiring 221 extends along the bottom of the recess 34 of the second stator vane 332. The bottom is the inner surface of the recess 34 facing the one axial direction Da. In this way, the length of the recess 34 in the direction in which the second stator vane 332 extends is longer than the recess 34 of the other stator vanes 33 (for example, the first stator vane 331). Therefore, by extending the external wiring 221 along the bottom of the recess 34, it can reach the outer frame 32 without significantly affecting the airflow in the recess 34. Therefore, it is possible to draw the external wiring 221 to the outside of the fan unit 100 while suppressing a decrease in the rectifying effect of the second stator vane 332 and a decrease in the air blowing efficiency of the fan unit 100.

[0057] However, the example of this embodiment does not exclude a configuration in which the radially inner end of the recess 34 of the second stator vane 332 is not positioned radially inward relative to the radially inner end of the recess 34 of the other stator vanes 33 (such as the first stator vane 331). For example, the radial position of the radially inner end of the recess 34 of the second stator vane 332 may be the same as or further radially outward than the radially inner end of the recess 34 of the other stator vane 33 (such as the first stator vane 331).

[0058] Furthermore, the example of this embodiment does not exclude a configuration in which the external wiring 221 is arranged on a stator vane 33 other than the second stator vane 332 (for example, any of the first stator vanes 331). For example, the second stator vane 332 may not be included in the multiple stator vanes 33 and may be omitted. Alternatively, the radially inner end of the recess 34 of the second stator vane 332 may be the radially outer end of the support body 31. In other words, one axial end of the second stator vane 332 may be located on the other axial direction Db than one axial end of another stator vane 33 (for example, the first stator vane 331 and a third stator vane 333 described later).

[0059] In this embodiment, the plurality of stator vanes 33 include a third stator vane 333. A radially outer end of the third stator vane 333 is connected to the plane 323. Although there is a single third stator vane 333 in this embodiment, there may be a plurality of third stator vanes 333. In addition, the third stator vane 333 does not have a blind spot in the axial direction D with respect to the inner circumferential surface of the outer frame body 32. Therefore, the third stator vane 333 does not have a pedestal portion 35.

[0060] The recess 34 is also disposed at the radially outer end of one axial end of the third stator vane 333. Preferably, the radial position of the radially inner end of the recess 34 of the third stator vane 333 is the same as the radially outer end of the recess 34 of the first stator vane 331. In other words, in the third stator vane 333, a second ratio of the radial position of the radially inner end of the recess 34 to the radial position of the cylindrical surface 321 is preferably 70% or more and 96% or less, and more preferably 90% or more and 96% or less. In detail, the second ratio is a percentage of the distance between the radially inner end of the recess 34 of the third stator vane 333 and the rotation axis J with respect to half the inner diameter of the cylindrical surface 321 (the distance between the radially inner end of the expansion surface 322 and the rotation axis J) as viewed in the axial direction D, and is preferably the same as the above-described first ratio of the first stator vane 331.

[0061] More preferably, the radial positions of the radially outer ends of the stator vanes 33 other than at least the second stator vane 332 are all the same. For example, when viewed from the axial direction D, the radially inner ends of the recesses 34 of the first stator vane 331 and the third stator vane 333 are all arranged on the same imaginary circle centered on the rotation axis J (see dashed line C1 in FIG. 4 ). This makes it easier to make the influence of the recesses 34 of the stator vanes 33 on the airflow in their vicinity uniform across the circumferential direction Dc. Therefore, it is possible to suppress bias in the circumferential direction Dc in the rectifying effect of the stator vanes 33 near one axial end of the inner circumferential surface of the outer frame body 32 and in the air blowing efficiency of the fan device 100.

[0062] Note that the above examples do not exclude a configuration in which the aforementioned second ratio for the third stator vane 333 is different from the aforementioned first ratio for the first stator vane 331, nor do they exclude a configuration in which the radial positions of the radial outer ends of the stator vanes 33 other than at least the second stator vane 332 are not all the same.

[0063] Furthermore, the example of this embodiment does not exclude a configuration in which the multiple stator vanes 33 do not include the third stator vane 333. For example, if the inner circumferential surface of the outer frame body 32 does not include the flat surface 323, the third stator vane 333 is not arranged. Even if the inner circumferential surface of the outer frame body 32 includes the flat surface 323, the third stator vane 333 may not be included in the multiple stator vanes 33 and may be omitted.

[0064] 2. Remarks The above describes the embodiments of the present invention. Note that the above embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component and each process, and that such modifications are within the scope of the present invention.

[0065] 3. Summary The following provides a summary of the embodiments described above.

[0066] For example, a fan device 100 disclosed in this specification includes: a support 31 that is arranged on one axial direction Da of a motor 2 that rotates an impeller 1 around a rotation axis J extending in the axial direction D and supports the motor 2; a cylindrical outer frame body 32 that extends in the axial direction D and surrounds the impeller 1, the motor 2, and the support body 31; and a plurality of stator vanes 33 that extend at least in the radial direction from the support body 31 to be connected to an inner circumferential surface of the outer frame body 32 and that expand in one circumferential direction as they extend in the other axial direction Db, wherein the inner circumferential surface of the outer frame body 32 includes: a cylindrical surface 321 extending in the axial direction D; and an expanding diameter surface 322 that expands radially outward as it extends from one axial end of the cylindrical surface 321 toward the one axial direction Da, and the plurality of stator vanes 33 include first stator vanes 331, and at least a portion of the radially outer end of the first stator vane 331 is connected to the expanding diameter surface 322, The radially outer end of the first stator vane 331 and the expanded diameter surface 322 overlap with a gap (a space that is a blind spot), a pedestal portion 35 extending from the expanded diameter surface 322 in one axial direction Da is arranged in the gap, a recess 34 recessed from one axial end of the first stator vane 311 to the other axial direction is arranged in the radially outer end of at least some of the first stator vanes 331 among the plurality of stator vanes 33, and a radially inner end of the recess 34 is arranged radially inward from the cylindrical surface 321 (first configuration).

[0067] The fan device 100 of the first configuration may also be configured (second configuration) such that, when viewed from the axial direction D, a first ratio of the distance between the radial inner end of the recess 34 and the rotation axis J to half the inner diameter of the cylindrical surface 321 (the distance between the radial inner end of the expanded diameter surface 322 and the rotation axis J) is 70% or more and 96% or less.

[0068] Furthermore, the fan device 100 of the first or second configuration may be configured such that the plurality of stator vanes 33 include second stator vanes 332 on which wiring 221 drawn from the motor 2 is arranged, the recess 34 is arranged at the radially outer end at one axial end of the second stator vane 332, the radially inner end of the recess 34 of the second stator vane 332 is arranged radially inward relative to the radially inner end of the recess 34 of the stator vanes 33 other than the second stator vane 332, and the wiring extends along the bottom of the recess in the recess of the second stator vane (third configuration).

[0069] Furthermore, the fan device 100 of any of the first to third configurations may be configured (fourth configuration) in which the plurality of stator vanes 33 include second stator vanes 332 on which wiring 221 drawn out from the motor 2 is arranged, the recess 34 is arranged at the radially outer end portion at one axial end portion of the second stator vane 332, and the radially outer ends of at least the stator vanes 33 other than the second stator vane 332 are at the same radial position.

[0070] Furthermore, the fan device 100 having any of the first to fourth configurations may be configured (fifth configuration) such that a rounded portion 330 is disposed at the circumferential end of one axial end of the stator blade 33, where the corner formed by one axial end face and the circumferential end face is rounded.

[0071] Furthermore, the fan device 100 of the fifth configuration may be configured (sixth configuration) in which the radius of curvature r of the R-chamfered portion 330 is greater than or equal to 1 / 3 of the thickness d of one axial end of the stator blade 33 and is less than or equal to 1 / 2 of the thickness d.

[0072] The present invention is useful for a fan device in which an expanded diameter surface is arranged on an outer frame body to which a stator blade is connected.

[0073] 100...fan device, 101...suction port, 102...delivery port, 103...wind tunnel, 1...impeller, 11...hub, 111...plate portion, 112...cylindrical portion, 12...rotor blade, 2...motor, 21...shaft, 22...substrate, 221...external wiring, 23...stator, 3...housing, 31...support, 32...outer frame body, 321...cylindrical surface, 322...expanded diameter surface, 323...flat surface, 33...stationary blade, 330...R-chamfered portion, 331...first stationary blade, 332...second stationary blade, 333...wiring stationary blade, 34...recess, 35...pedestal portion, J...rotating shaft, D...axial direction, Da...one side of axial direction, Db...other side of axial direction, Dc...circumferential direction

Claims

1. A rotor comprising: a support body arranged on one axial side of a motor that rotates an impeller around a rotation axis extending in the axial direction and supporting the motor; a cylindrical outer frame body extending in the axial direction surrounding the impeller, the motor, and the support body; and a plurality of stator vanes extending at least radially from the support body to be connected to an inner peripheral surface of the outer frame body and expanding in one circumferential direction as they extend in the other axial direction, wherein the inner peripheral surface of the outer frame body includes: a cylindrical surface extending in the axial direction; and an expanding surface that expands radially outward as it extends from one axial end of the cylindrical surface toward the one axial direction, wherein the plurality of stator vanes include first stator vanes, wherein at least a portion of a radially outer end of the first stator vane is connected to the expanding surface, and wherein the radially outer end of the first stator vane and the expanding surface overlap with a gap, and a pedestal portion extending in one axial direction from the expanding surface is arranged in the gap, a first stator vane including at least a portion of the plurality of stator vanes, the first stator vanes including at least a portion of the first stator vanes having a radially outer end portion that is recessed from one axial end portion of the first stator vane to the other axial end portion of the first stator vane, and a radially inner end portion of the recessed portion is located radially inward of the cylindrical surface.

2. A fan device as described in claim 1, wherein, when viewed in the axial direction, a first ratio of the distance between the radially inner end of the recess and the rotating shaft to half the inner diameter of the cylindrical surface is 70% or more and 96% or less.

3. A fan device according to claim 1 or claim 2, wherein the plurality of stator vanes include a second stator vane in which wiring drawn from the motor is arranged, the recess is arranged at the radially outer end at one axial end of the second stator vane, the radially inner end of the recess of the second stator vane is arranged radially inward relative to the radially inner ends of the recesses of the stator vanes other than the second stator vane, and the wiring extends along the bottom of the recess in the recess of the second stator vane.

4. A fan apparatus according to claim 3, wherein the radially outer ends of at least the stator vanes other than the second stator vane are at the same radial position.

5. A fan device according to claim 1 or claim 2, wherein the plurality of stator vanes include a second stator vane on which wiring drawn from the motor is arranged, the recess is arranged at the radially outer end of one axial end of the second stator vane, and the radially outer ends of at least the stator vanes other than the second stator vane are in the same radial position.

6. A fan device as described in any one of claims 1 to 5, wherein an R-chamfered portion is disposed at the circumferential end of one axial end of the stator vane, with the corner formed by one axial end face and the circumferential end face being R-chamfered.

7. A fan apparatus according to claim 6, wherein the radius of curvature of said R-chamfered portion is not less than 1 / 3 and not more than 1 / 2 of the thickness of one axial end of said stator blade.

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