JP4973424B2 - Blower - Google Patents

Description

  The present invention relates to a blower provided with an axial fan.

  Conventionally, in a server computer that transmits information to a client computer, a rack mount server or a blade server has been adopted in order to efficiently use a limited space. In a blade server, a plurality of plate-like blades equipped with MPU (Micro Processig Unit), memory, etc. are housed in an enclosure (case) with high density and attached to a storage rack. The device and the cooling device are shared by a plurality of blades in one enclosure. When a fan is used as a cooling device, as shown in Patent Document 1, the fans are attached to the front and rear portions of the chassis (enclosure) to generate air flowing in the chassis.

  On the other hand, in recent years, it has been required to improve the air blowing characteristics of the cooling fan as the blade arrangement density increases. For example, in the electric fan disclosed in Patent Document 2, the housing surrounding the impeller has a double structure of an inner housing and an outer housing. In the inner housing, the inner surface of the rectangular frame is substantially cylindrical. A cutout portion is formed at the position where the thickness of the inner housing is the thinnest, and a stepped engagement portion that protrudes between the cutout portions and has a concave surface corresponding to the cutout portion of the inner housing on the inner side of the outer housing. Is formed. This makes it possible to reduce the outer dimensions while increasing the diameter of the impeller.

Further, in the air-cooled fan disclosed in Patent Document 3, a frame body having a rectangular outer shape surrounding the fan wheel is formed of a thin plate-shaped metal material and a resin covering the periphery of the metal material, and the four sides of the frame body The thin portion at the center of each is not covered with resin and is made of only a metal material, and the inside of the frame body is widened.
JP 2004-240967 A JP 2006-336523 A Utility Model Registration No. 3121954

  By the way, in order to efficiently guide air to an object, when a duct is attached to the cooling fan, a sufficient space for attaching the duct to the cooling fan is provided in order to ensure the connection strength between the cooling fan and the duct. Therefore, it is difficult to widen the flow path.

  The present invention has been made in view of the above problems, and has a main purpose of enlarging the air flow area of the axial flow fan unit when the duct unit is provided in the air blower. It is also intended to prevent a decrease in rigidity of the housing part.

  The invention according to claim 1 is a blower that sends air to an object or discharges air around the object, and has an outer shape of a substantially quadrangular prism, and one end in the central axis direction is on the intake side An axial fan portion having a housing portion whose other end portion is on the exhaust side, and a duct portion extending from the end portion on the exhaust side of the housing portion along the four outer surfaces of the housing portion in the blowing direction. And at least one of the four outer surfaces, the housing portion has a notch extending parallel to the central axis between the edges on both sides in contact with the other outer surface, The casing has a thin plate shape extending from the duct portion to the housing portion side, and covers the cutout portion to form an inner surface of a substantially cylindrical flow path centering on the central axis together with the housing portion. Has a cut-out occlusion .

  Invention of Claim 2 is an air blower of Claim 1, Comprising: The said housing | casing is shape | molded by bending a thin plate.

  Invention of Claim 3 is an air blower of Claim 2, Comprising: The said housing | casing is formed with a metal.

  Invention of Claim 4 is an air blower of Claim 2 or 3, Comprising: The said housing | casing is a cylinder with a substantially square cross section perpendicular | vertical to the said central axis, The outer surface of the said housing part A part of the part covering the whole is the notch closing part, and a part extending in the blowing direction from the exhaust side end of the housing part is the duct part.

  Invention of Claim 5 is an air blower in any one of Claim 1 thru | or 4, Comprising: The said outer side surface which the said notch part opposes on both sides of the said center axis | shaft among these four outer surfaces Formed on each.

  A sixth aspect of the present invention is the blower device according to any one of the first to fifth aspects, wherein the blower is disposed inside the duct portion, and an opening on the exhaust side of the inner side surface of the housing portion is the center. A duct auxiliary member that forms a substantially cylindrical inner surface extending in the axial direction together with the duct portion is further provided.

  A seventh aspect of the present invention is the air blower according to any one of the first to sixth aspects, comprising a plurality of axial flow fans in which the axial flow fan portions are connected in series.

  According to the present invention, the air flow path area of the axial fan unit can be increased by the casing having the duct unit. In the inventions of claims 2 and 3, the housing can be manufactured at low cost. In the invention of claim 4, the strength of the housing portion can be ensured. In the invention of claim 6, air can be smoothly guided from the housing portion to the duct portion by the duct auxiliary member.

  FIG. 1 is a perspective view showing the blower 1 according to the first embodiment, and the internal structure is indicated by a broken line. The blower device 1 is used to cool the electronic device by sending air to the electronic device mounted on the server computer or discharging the air around the electronic device, and the axial fan unit 2 and the axial fan unit 2 are used. A cylindrical casing 5 that covers and extends in the blowing direction is provided. The axial fan unit 2 is a series axial fan in which the second axial fan 4 is connected in series to the end of the first axial fan 3 on the exhaust side, and the housing 5 is made of metal. A thin plate is formed by bending with a press. In the following description, for convenience, a part of the housing 5 that covers the axial fan unit 2 is referred to as a “fan circumscribing portion 51”, and air is blown from an end on the exhaust side of the axial fan unit 2 (or a housing unit described later). A portion extending in the direction is referred to as a “duct portion 52”.

  The length of the duct portion 52 in the central axis direction is made longer than the length of the fan circumscribing portion 51, that is, the height of the axial fan portion 2. It is done. As a result, the duct portion 52 and the duct auxiliary member 6 flow from the axial fan portion 2 to the lower side in FIG. 1 (the exhaust side of the duct portion 52) on the lower side of the axial fan portion 2. Form.

  FIG. 2 is a longitudinal sectional view of the axial fan section 2 cut along a plane including the central axis J1. In the following description, the upper side in FIG. 2 is referred to as “intake side” or simply “upper side” and the lower side in FIG. 2 is referred to as “exhaust side” or simply “lower side” in the direction of the central axis J1. Note that the expressions “upper side” and “lower side” do not necessarily coincide with the upper side and the lower side with respect to the direction of gravity.

  The first axial fan 3 extends in the radially outward direction around the first motor unit 31 and the first motor unit 31 and is arranged at a plurality of pitches (11 in this embodiment) arranged at an equal pitch in the circumferential direction. First impeller 32 having first blades 321, a first housing portion 33 that substantially surrounds the outer periphery of the first impeller 32, and a plurality (four in the present embodiment) that support the first motor portion 31. A first support rib 34 is provided. As will be described later, the first housing portion 33 is provided with a notch, but FIG. 2 shows a cross section of the first housing portion 33 at a position where the notch is not provided. In the first axial fan 3, the first impeller 32, the first motor part 31, and the first support rib 34 are disposed inside the first housing part 33. In FIG. 2, for convenience of illustration, schematic shapes of the first blade 321 and the first support rib 34 of the first impeller 32 are shown on the left and right of the central axis J1. Further, the first motor unit 31 is shown exaggeratedly large, and illustration of parallel oblique lines with respect to the cross section of each component is omitted. The second axial fan 4 is also shown in the same manner.

  The first motor unit 31 includes a first rotor unit 311 and a first stator unit 312, and the first rotor unit 311 is positioned above the first stator unit 312 along the central axis J1. The first rotor portion 311 includes a substantially cylindrical field magnet 3111 fixed to the inside of the first impeller 32 (more precisely, the inside of the yoke 35 inside the first impeller 32), and the first impeller 32. A shaft 3112 protruding downward from the center of the upper portion. The first stator portion 312 includes an armature 3121 diametrically opposed to the field magnet 3111 of the first rotor portion 311, ball bearings 3122 and 3123 which are bearing mechanisms attached to the upper and lower portions of the shaft 3112, and first A base portion 3124 that holds each portion of the one stator portion 312 is provided. The base portion 3124 is formed by injection molding as one resin member together with the first support rib 34 and the first housing portion 33.

  In the first axial fan 3, when a drive current is supplied to the armature 3121 from an external power source (not shown), torque about the central axis J <b> 1 is between the armature 3121 and the field magnet 3111. As it occurs, the shaft 3112 is supported by the ball bearings 3122 and 3123, and the rotor portion 311 rotates with respect to the stator portion 312.

  The second axial fan 4 is substantially the same as the structure in which the first axial fan 3 is turned upside down, and a plurality of (in this embodiment) the second motor unit 41 and the second motor unit 41 are arranged around the second motor unit 41. 11) the second impeller 42 having the second blades 421, the second housing part 43 that substantially surrounds the outer periphery of the second impeller 42, and a plurality (four in this embodiment) that support the second motor part 41. The second support rib 44 is provided. The second housing part 43 is also provided with a notch, but FIG. 2 shows a cross section of the second housing part 43 at a position where the notch is not provided.

  In the second motor unit 41, the second stator unit 412 is located on the upper side with respect to the second rotor unit 411. The second rotor portion 411 includes a substantially cylindrical field magnet 4111 fixed to the inside of the second impeller 42 (more precisely, the inside of the yoke 45 inside the second impeller 42), and the second impeller 42. The second stator portion 412 includes an armature 4121 that faces the field magnet 4111 in the radial direction, and ball bearings 4122 that are disposed above and below the shaft 4112. 4123 and a base part 4124 for holding each part of the second stator part 412. The base portion 4124 is formed as a single resin member together with the second support rib 44 and the second housing portion 43.

  In the second axial fan 4, torque is generated between the armature 4121 and the field magnet 4111, the shaft 4112 is supported by the ball bearings 4122 and 4123, and the second rotor portion 411 is the second stator portion. Rotate relative to 412. The second impeller 42 rotates about the central axis J1 in the direction opposite to the first impeller 32, thereby generating an air flow in the same direction as the air flow generated by the rotation of the first impeller 32. Air is sent from the fan unit 2 to the duct unit 52 of the housing 5 (see FIG. 1). That is, the axial fan unit 2 is a so-called counter-rotating axial fan.

  FIG. 3 is a perspective view of the axial fan unit 2. In the axial fan unit 2, the first and second housing units 33 and 43 (hereinafter referred to as “housing units 33 and 43”) of the first and second axial fans 3 and 4 have the same size and the same size. An integral housing portion (that is, the housing portion of the axial fan portion 2) is formed in a shape, and one end portion in the direction of the central axis J1 is the intake side and the other end portion is the exhaust side by the housing portions 33 and 43. Composed. The shape of the surface of the housing portions 33 and 43 (hereinafter referred to as “outer shape”) is a substantially quadrangular prism shape with a part cut away. In the following description, a virtual rectangular parallelepiped (shown by a two-dot chain line) circumscribing the outer shape of the housing portions 33 and 43 is referred to as “the circumscribed square column 8”, and “the outer surface of the housing portions 33 and 43”. The expression “s” refers to the side surface of the circumscribed square column 8.

  In the axial fan unit 2, the two outer surfaces located on the right front side and the rear left side in FIG. 3 that face each other across the central axis J1 among the four outer surfaces of the housing portions 33 and 43 are perpendicular to the central axis J1 and Approximately the center in the width direction parallel to the outer surface (in other words, approximately the center between the edges on both sides in contact with the outer surface located on the left front and right back in FIG. 3, which are the other two outer surfaces adjacent to each other) In addition, a cutout portion 71 of the first housing portion 33 and a cutout portion 72 of the second housing portion 43 are provided that extend parallel to the central axis J1. In addition, when the housing parts 33 and 34 are regarded as the housing part of the axial fan part 2, providing the notch parts 71 and 72 in the housing parts 33 and 34 provides the notch part in the housing part of the axial fan part 2. It corresponds to that.

  The notch 71 is continuously provided from the end on the intake side to the end on the exhaust side of the first housing part 33, and the notch 72 is similarly formed from the end on the intake side of the second housing part 43. It is continuously provided up to the end on the exhaust side. Further, the notch portion 71 extends in the width direction at the intake side and exhaust side ends of the first housing portion 33, and the notch portion 72 also extends in the width direction at the intake side and exhaust side ends of the second housing portion 43. It has spread. The first housing part 33 is divided into two parts by providing the two notches 71. The two parts are one member together with the first support rib 34 and the base part 3124 (see FIG. 2). (The same applies to the second housing portion 43).

  As shown in FIG. 2, the inner side surfaces 331, the intake-side and exhaust-side ends of the first housing portion 33, and the intake-side and exhaust-side ends of the second housing portion 43 are arranged. 431 is an inclined surface that gradually spreads outward in the radial direction. As shown in FIG. 3, each of the four corners of the first and second axial fans 3 and 4 is provided with a hole portion 21 that passes through the axial fans 3 and 4. The first axial fan 3 and the second axial fan 4 are fixed to each other by inserting a rivet or the like.

  4 shows a blower 1 cut along a plane parallel to the XY plane in FIG. 1 perpendicular to the central axis J1 at the exhaust side end face of the second axial fan 4 shown in FIG. It is the figure seen, and illustration of the 1st axial flow fan 3 is abbreviate | omitted. As shown in FIG. 1, the fan circumscribing portion 51 of the housing 5 extends from the duct portion 52 toward the housing portions 33 and 43 and covers the entire outer surfaces of the housing portions 33 and 43, and as shown in FIG. A quadrangle whose cross section perpendicular to the central axis J1 circumscribes the first housing part 33 (see FIG. 3) and the second housing part 43 (that is, a quadrangle along the circumscribed square column 8 (see FIG. 3) of the axial flow fan part 2). It has become. The thickness of the housing 5 is made thinner than the minimum thickness of a general resin of a housing formed by injection molding.

  3 and FIG. 4, the notches 71 and 72 of the housing parts 33 and 43 are completely covered by the fan circumscribing portion 51, and the thin plate-like portions covering the notches 71 and 72 of the fan circumscribing portion 51 are respectively “notched closed”. When expressed as “part 511”, the notch closing part 511 is a substantially cylindrical air flow path centered on the central axis J1 together with the inner side surface 331 of the first housing part 33 and the inner side face 431 of the second housing part 43. It is a site | part which forms an inner surface. In the vicinity of the cutouts 71 and 72 of the axial fan unit 2 (see FIG. 3), the part that partitions the outside of the blower 1 and the air flow path is only the cutout blocking part 511 of the housing 5. Thus, since the housing | casing 5 is formed with a metal, the intensity | strength of the air blower 1 is ensured.

  As shown in FIG. 4, a sufficient thickness is ensured between the inner side surface 431 and the left and right outer surfaces of the second housing portion 43, and the diameter of the second impeller 42 is two notch blocking portions 511 that face each other. The distance between the inner surfaces of the first impeller 32 and the first housing portion 33 is also slightly smaller than the distance between the inner surfaces of the first impeller 32 (see FIG. 2). On the other hand, the four second support ribs 44 of the second axial fan 4 are connected to two parts of the second housing part 43 divided by the notch 72 (two in the first axial fan 3). The same).

  FIG. 5 is a bottom view of the blower 1. The duct portion 52 of the housing 5 extends along the four outer surfaces of the housing portions 33 and 43 (see FIG. 3), and the shape of the cross section perpendicular to the central axis J1 of the duct portion 52 is the fan of the housing 5. A cross section perpendicular to the central axis J1 of the circumscribed portion 51 (see FIG. 4) is a quadrangle having the same size and shape. As shown in FIGS. 1 and 5, four bar-shaped members 61 that are substantially in contact with the lower surface of the second housing portion 43 are attached as duct auxiliary members 6 at the four corners inside the duct portion 52.

  FIG. 6 is a perspective view of one rod-shaped member 61, with the lower end surface facing left. The rod-shaped member 61 is formed by resin injection molding. As shown in FIGS. 5 and 6, the shape of the rod-shaped member 61 viewed along the direction in which the rod-shaped member 61 extends (that is, a cross-sectional shape perpendicular to the central axis J1). Is substantially the same as the shape of the corner of the exhaust-side end surface (see FIG. 4) of the second housing portion 43 (more precisely, the shape excluding the hole 21 (see FIG. 3) from the corner), The rod-shaped member 61 has a shape in which each corner portion on the exhaust-side end surface of the second housing portion 43 extends in parallel to the central axis J1. Therefore, the inner surface of the rod-shaped member 61 is a part of a cylindrical surface that is substantially centered on the central axis J <b> 1, similarly to the shape of the end surface on the exhaust side of the second housing portion 43. In other words, inside the duct portion 52, as shown in FIG. 5, the regions in the vicinity of the center in the width direction of the four surfaces of the duct portion 52, and the four rod-shaped members 61 of the duct auxiliary member 6, respectively. The inner surface of the second housing part 43 (see FIG. 4) forms a substantially cylindrical inner side surface extending from the exhaust side opening of the inner side surface 431 in the direction of the central axis J1 as an air flow path. Thereby, air is smoothly guided from the housing parts 33 and 43 to the exhaust side of the duct part 52.

  Furthermore, the inner surface of the rod-shaped member 61 has a small surface roughness, and even if the axial fan unit 2 and the exhaust port of the duct unit 52 are separated from each other, pressure loss due to air friction in the duct unit 52 is reduced. Reduction is achieved with a simple structure. Further, the pressure loss can be further reduced at a lower cost by molding the rod-shaped member 61 itself with a material having a small surface roughness.

  FIG. 7 is a view illustrating a side surface on the left front side of the blower 1 illustrated in FIG. 1. In the blower device 1, the duct portion 52 and the duct auxiliary member 6 of the housing 5 are screwed on both sides of the duct portion 52 on the exhaust side and the axial fan portion 2 side in the width direction (left and right direction in FIG. 7). Fixed. That is, each rod-shaped member 61 of the duct auxiliary member 6 is fixed at two locations, the exhaust side and the intake side. Further, as shown in FIG. 8, the head portion 91 of the screw 9 has a shape that does not protrude from the surface of the duct portion 52. On the other hand, as shown in FIG. 7, the fan outer circumscribing portion 51 of the housing 5 and the first and second axial fans 3 and 4 include four thick housings of the axial fans 3 and 4. The screw 9 is fixed near the corner, and the head 91 of the screw 9 does not protrude from the surface of the fan circumscribing portion 51 as in FIG.

  The blower 1 according to the first embodiment has been described above. In the blower 1, the cutout portions 71 and 72 are formed in the housing portions 33 and 43 of the axial fans 3 and 4, and the housing 5. Since the fan circumscribing portion 51 covers the axial fans 3 and 4, the air flow path of the axial fan portion 2 is on the inner surface of the notch closing portion 511 of the fan circumscribing portion 51 compared to the housing in which the notch portion is not provided. (That is, the flow area of the air is increased). Thereby, it becomes possible to enlarge the diameter of the impellers 32 and 42 mounted, and the static pressure-air volume characteristic of the air blower 1 is improved. As a result, generation of noise and an increase in current value are suppressed as compared with the case where the rotational speed of the impeller is increased to improve the static pressure-air volume characteristic.

  In addition, the fact that the diameter of the impeller can be enlarged in the blower 1 is equivalent to the fact that the size of the housing part can be made relatively small with respect to the diameter of the impeller. By providing the notches 71 and 72 on the two outer surfaces facing each other across the central axis J1, it is possible to reduce the distance between these outer surfaces of the axial fan unit 2.

  Further, the fan circumscribing portion 51 of the housing 5 covers the entire outer surface of the housing portions 33 and 43, so that the strength of the housing portions 33 and 43 is ensured, and the housing 5 is formed by bending a thin plate. From low cost.

  FIG. 9 is a view of a surface of the blower 1a according to the second embodiment cut at the end surface on the exhaust side of the second axial fan 4a as viewed from below, and corresponds to FIG. The illustration of the first axial fan is omitted. In the second axial fan 4a, the shape viewed along the central axis J1 is square, and is substantially the center in the width direction perpendicular to the central axis J1 of all the outer surfaces of the second housing part 43a and parallel to the outer surface. (In other words, on each outer surface, four notches 72 extending in parallel to the central axis J1 are provided at the approximate center between the two edges that are in contact with the other two adjacent outer surfaces). The first housing portion of the first axial fan has the same shape as the second housing portion 43a, and four notches are formed at substantially the center in the width direction of all the outer surfaces of the first housing portion.

  The four second support ribs 44 of the second axial fan 4a are respectively connected to four parts of the second housing part 43a divided by the four notches 72 (also in the first axial fan). The same). The other structure of the air blower 1a is the same as that of 1st Embodiment.

  In the second housing portion 43a, the entire outer surface of the second housing portion 43a is covered by the fan circumscribing portion 51 of the housing 5, and similarly, the entire outer surface of the first housing portion of the first axial fan is also the fan circumscribing portion. 51. The notch 72 of the second housing part 43a and the notch of the first housing part are completely covered by the fan circumscribing part 51, and the thickness of the housing 5 is the minimum of a general resin of a housing formed by injection molding. It is made thinner than the thickness. As a result, the air flow path of the blower 1a is provided by the four cutout closing portions 511 that cover the inner side surface 431a of the second housing portion 43a, the inner side surface of the first housing portion, and the cutout portion of the fan outer circumscribed portion 51. The inner surface is formed. Further, the diameter of the second impeller 42 is slightly smaller than the distance between the inner surfaces of the two notch blocking portions 511 facing each other (the same applies to the first impeller).

  In the first axial flow fan and the second axial flow fan 4a (that is, the axial flow fan portion), the cutout portion of the first housing portion, the cutout portion 72 of the second housing portion 43a, and the cutout closing portion 511 of the housing 5 are provided. As a result, the air flow passage area is increased as compared with the housing in which the notch portion is not provided, and the air blowing characteristics of the air blowing device 1a are improved as in the first embodiment. Further, since the fan circumscribing portion 51 covers the entire outer surface of the first housing portion and the second housing portion 43a, the strength of the first housing portion and the second housing portion 43a is ensured.

  FIG. 10 is a view of a surface of the blower 1b according to the third embodiment cut at the end surface on the exhaust side of the second axial fan 4b as viewed from below, and corresponds to FIG. FIG. 11 is a perspective view showing the axial fan portion 2b of the blower 1b. As shown in FIG. 10, in the second axial fan 4b, three outer surfaces (upper, lower, and right outer surfaces in FIG. 10) out of the four outer surfaces of the second housing portion 43b are the remaining one. It is slightly closer to the central axis J1 than the outer surface (the left outer surface in FIG. 10). Each of the three outer surfaces is provided with a notch 72 extending in parallel with the central axis J1 at the approximate center in the width direction (direction perpendicular to the central axis J1 and parallel to the outer surface).

  As shown in FIG. 11, the first housing part 33b of the first axial fan 3b has the same shape as the second housing part 43b of the second axial fan 4b, and the three outer surfaces of the first housing part 33b A notch 71 that extends continuously from the notch 72 of the second housing part 43b and extends parallel to the central axis J1 is provided substantially at the center. That is, in the axial fan part 2 shown in FIG. 3, the notches 71 and 72 of the housing parts 33 and 43 are provided at two places and in FIG. 9 at four places, but in the axial fan part 2b, the housing part is provided. Notches 71 and 72 of 33b and 43b are provided in three places.

  As shown in FIG. 10, the four second support ribs 44 of the second axial fan 4 b are the second housing part 43 b among the three parts of the second housing part 43 b divided by the three cutouts 72. Are connected one by one to two parts having two corners (the two parts on the right side of FIG. 10) and two connected to parts having two corners (the part on the left side of FIG. 10). The same applies to the single axial fan 3b). Other configurations are the same as those of the first embodiment.

  In the second housing portion 43b, the entire outer surface of the second housing portion 43b is covered by the fan outer circumscribing portion 51 of the housing 5, and the notch portion 72 is also completely covered by a part of the fan outer circumscribing portion 51 (ie, the notch closing portion 511). Covered with. Similarly, the entire first housing portion 33b of the first axial fan 3b (see FIG. 11) is also covered by the fan circumscribing portion 51, and the notch portion 71 is completely covered by the fan circumscribing portion 51 (the notch closing portion 511). . Thus, the first and second housing portions 33b and 43b are formed by the inner side surface 431b of the second housing portion 43b, the inner side surface 331b (see FIG. 11) of the first housing portion 33b, and the notch closing portion 511 of the fan outer circumscribing portion 51. The inner surface of the air flow path is formed, and the air flow path area and the impeller diameter are increased as compared with the housing without the notch.

  FIG. 12 is a view of a surface obtained by cutting the blower 1c according to the fourth embodiment at the end surface on the exhaust side of the second axial fan 4c as viewed from below. In the second axial fan 4c, one outer surface (the lower outer surface in FIG. 12) of the second housing portion 43c is slightly closer to the central axis J1 than the other outer surface, One notch 72 extending parallel to the central axis J1 is provided at the center in the width direction. Similarly, one notch is formed on the outer surface of the first housing portion of the first axial fan at the same position. Also in the air blower 1c, the notch 72 of the second housing part 43c and the notch of the first housing part are covered with the notch closing part 511 of the fan circumscribing part 51. The air passage area of the device 1c is increased.

  As described above, the structure of the housing part having the cutout portion in the blower according to the first to fourth embodiments has been described. However, in the axial fan part, the housing part (the entire housing part of the two axial fan parts is shown). The at least one outer surface closest to the central axis among the four outer surfaces of the housing portion of the axial flow fan portion) is provided with a notch in the housing portion, thereby increasing the diameter of the impeller (or reducing the outer shape). Is realized.

  FIG. 13: is a side view which expands and shows a part of air blower 1d which concerns on 5th Embodiment. In the blower 1d, notches 71 and 72 are provided on two outer surfaces facing each other out of the outer surfaces of the housing portions 33d and 43d of the first and second axial fans 3d and 4d. The portion 51a is shaped to cover the notches 71 and 72 and the areas 332 and 432 in the vicinity of the notches 71 and 72 (hereinafter referred to as “notch vicinity areas 332 and 432”). The structure of the blower 1d other than the fan circumscribing portion 51a and the notch vicinity regions 332 and 432 of the housing 5 is the same as that of the first embodiment.

  The notch vicinity regions 332 and 432 are slightly recessed inward (that is, recessed from the front side to the back side on the paper surface), and the axial fan portion 2d moves in the direction indicated by the arrow 8. The four holes 3321 and 4321 on the notch vicinity regions 332 and 432 overlap with the four holes 512 and 513 of the fan circumscribing portion 51a of the housing 5, and the axial fans 3d and 4d and the fan circumscribing portion are screwed together. 51a is fixed. As a result, the inner surface of the air flow path of the axial fan portion 2d is formed by the portion (that is, the notch closing portion) that covers the inner surfaces of the housing portions 33d and 43d and the notches 71 and 72 of the fan circumscribing portion 51a. The

  FIG. 14 is a cross-sectional view in which the vicinity of the notch 71 of the first housing portion 33d is cut by a plane perpendicular to the central axis in a state where the fan circumscribed portion 51a is attached to the axial fans 3d and 4d. The height of the step between the outer surface of the first housing part 33d and the notch vicinity region 332 is substantially equal to the thickness of the fan outer part 51a, and the fan outer part 51a hardly protrudes from the outer surface of the first housing part 33d. The same is applied to the second housing portion 43d. The thickness of the notch closing portion 511 of the fan circumscribing portion 51a is made thinner than the minimum thickness of a general resin of a housing formed by injection molding, and a notch portion is provided as in the first embodiment. The air passage area is increased as compared with a housing without a housing. As in the second to fourth embodiments, in the fifth embodiment, the cutout portion and the cutout closing portion may be provided on any outer surface of the housing portion.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, as shown in FIG. 15, the structure in which the notches 71 and 72 are provided is an axial fan unit in which inclined surfaces are not provided on the inner surface at the end portions on the intake side and the exhaust side of the housing portions 33e and 43e. 2e may be adopted. In this case, the thickness of the housing portions 33e and 43e of the axial fan portion 2e excluding the corner portions is substantially constant, and the notches 71 and 72 do not spread in the width direction at the end portions on the intake side and the exhaust side, It extends parallel to the central axis J1.

  In each axial fan of the axial fan part in the above embodiment, the housing part, the four support ribs and the base part are formed as one member, but the support rib and the base part are formed by the notch part of the housing part. A part of a plurality of divided parts (hereinafter referred to as “housing element”) is formed as one member and then combined with another housing element, or is formed as a separate member from the housing element. May be combined. The number of support ribs is not limited to four, and other numbers may be adopted. Moreover, the housing part, the support rib, and the base part may be formed of a material other than resin, and may be formed of, for example, aluminum die casting.

  In the above embodiment, when the length of the duct portion 52 is sufficiently shortened or when the flow rate of air from the axial fan portion is sufficiently secured, the duct auxiliary member 6 inside the duct portion 52 is It may be omitted. Further, the structure in which the housing portion is provided with the notch portion can also be adopted for the axial fan portion having an outer shape different from that of the housing portion in the above embodiment. For example, the outer shape of the housing portion is the intake side and the exhaust side. The axial flow fan may have a substantially cylindrical shape between the two end portions, and the end portions on the intake side and the exhaust side may have a substantially square flange shape.

  The shape of the cross section perpendicular to the central axis of the housing 5 is not limited to an accurate quadrangle, and the cross section of the corner may be an arc-shaped so-called R shape or a linear so-called C chamfer shape. In other words, the casing 5 may have various shapes as long as the cross section perpendicular to the central axis is a substantially rectangular cylinder.

  In the above embodiment, the second axial fan of the axial fan unit has a structure in which the first axial fan is turned upside down, but the rotor unit and the stator unit in the first axial fan and the second axial fan. The vertical relationship may be the same. Further, the first axial fan and the second axial fan may be disposed slightly apart from each other as long as the air blowing characteristics are not deteriorated. The second impeller 42 may rotate in the same direction as the first impeller 32 about the central axis J1. Further, the axial fan unit may be one axial fan.

  The air blower according to the above embodiment may be used as another air blower that sends air to an object other than an electronic device or discharges air around the object.

It is a perspective view of the air blower concerning a 1st embodiment. It is a longitudinal cross-sectional view of the axial-flow fan part which concerns on 1st Embodiment. It is a perspective view of the axial-flow fan part which concerns on 1st Embodiment. It is sectional drawing of an air blower. It is a bottom view of an air blower. It is a perspective view of a rod-shaped member. It is a side view of the air blower concerning a 1st embodiment. It is a figure which expands and shows a part of cross section of an air blower. It is sectional drawing of the air blower which concerns on 2nd Embodiment. It is sectional drawing of the air blower which concerns on 3rd Embodiment. It is a perspective view of the axial-flow fan part which concerns on 3rd Embodiment. It is sectional drawing of the air blower which concerns on 4th Embodiment. It is a side view of the air blower which concerns on 5th Embodiment. It is sectional drawing of an air blower. It is a figure which shows the other example of an axial flow fan part.

Explanation of symbols

1, 1a to 1d Blower 2, 2b, 2d, 2e Axial fan section 3, 3b, 3d First axial fan 4, 4a to 4d Second axial fan 5 Housing 6 Duct auxiliary member 33, 33b, 33d 33e First housing part 43, 43a to 43e Second housing part 52 Duct part 71 Notch part (of the first housing part) 72 Notch part (of the second housing part) 511 Notch closing part J1 Central axis

Claims (7)

A blower that sends air to an object or discharges air around the object,
An axial fan part having a housing part whose outer shape is a substantially quadrangular prism shape, one end part in the central axis direction being the intake side, and the other end part being the exhaust side;
A housing having a duct portion extending in an air blowing direction along the four outer surfaces of the housing portion from an end portion on the exhaust side of the housing portion;
With
The housing portion has a notch portion extending in parallel with the central axis between edges on both sides in contact with the other outer surface in at least one of the four outer surfaces;
The casing has a thin plate shape extending from the duct portion to the housing portion side, and covers the cutout portion to form an inner surface of a substantially cylindrical flow path centering on the central axis together with the housing portion. An air blower characterized by having a notch closing portion. It is an air blower of Claim 1, Comprising:
The blower characterized in that the casing is formed by bending a thin plate. The blower device according to claim 2,
The blower characterized in that the casing is made of metal. It is an air blower of Claim 2 or 3,
The casing has a cylindrical shape with a substantially rectangular cross section perpendicular to the central axis, a part of a portion covering the entire outer surface of the housing portion is the notch closing portion, and the exhaust side of the housing portion is disposed on the exhaust side. A portion extending from the end portion in the blowing direction is the duct portion. It is an air blower in any one of Claims 1 thru | or 4, Comprising:
The blower device, wherein the notch is formed on each of two outer surfaces facing each other across the central axis among the four outer surfaces. It is an air blower in any one of Claims 1 thru | or 5, Comprising:
A duct auxiliary member that is disposed inside the duct portion and that forms a substantially cylindrical inner side surface together with the duct portion, extending an opening on the exhaust side of the inner side surface of the housing portion in the central axis direction; The air blower characterized. The blower device according to any one of claims 1 to 6,
A blower comprising a plurality of axial fans in which the axial fan units are connected in series.

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