JP2018035795A - Axial fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial fan capable of reducing vibrations.SOLUTION: An axial fan 1 is equipped with an outer frame 40; an inner frame 30 disposed on the inside of the outer frame 40; a motor 10 supported to the inner frame 30; an impeller 20 attached to the motor 10; and resin members 51 and 52. The resin members 51 and 52 are disposed between the outer frame 40 and the inner frame 30. The inner frame 30 is supported to the outer frame 40 through the resin members 51 and 52. The resin members 51 and 52 are non-foamed members.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an axial fan.

  An axial fan is an axial flow type turbo fluid machine that handles a compressible fluid such as gas. Some axial fans are used, for example, in applications such as for introducing outside air into a device and cooling the device in an electronic computer such as a server. For this type of axial fan, the performance required for PQ characteristics and maximum static pressure is increasing year by year, and in order to satisfy these requirements, higher rotation speed and higher power of the axial fan are progressing. .

  Japanese Patent Application Laid-Open No. 2004-151620 describes that in an image forming apparatus, a fan is attached to an attachment portion of an intake port of a duct via a sponge to reduce the vibration of the fan transmitted to the duct.

JP 2014-185568 A

  In such an axial fan, when the rotational speed increases, vibration generated due to the vibration of the impeller of the axial fan increases. However, in the axial fan, it is preferable that the generated vibration is small. In other words, the axial fan is required to satisfy both the requirements regarding the vibration of the axial fan and the requirements regarding the performance characteristics of the axial fan, which are in a contradictory relationship as described above.

  The present invention has been made to solve such problems, and an object thereof is to provide an axial fan that can reduce vibration.

  In order to achieve the above object, according to one aspect of the present invention, an axial fan is attached to an outer frame, an inner frame disposed inside the outer frame, a motor supported with respect to the inner frame, and the motor. The non-foaming resin member disposed between the impeller and the outer frame and the inner frame is supported by the outer frame via the non-foaming resin member.

  Preferably, the resin member is a member having elasticity.

  Preferably, an annular gap formed so as to surround the rotation shaft of the impeller is disposed between the outer frame and the inner frame, and the resin member closes the annular gap.

  Preferably, a protrusion that protrudes toward the inner frame is provided on the inner periphery of the outer frame, and the protrusion of the outer frame is formed in an annular shape so as to cover a part of the gap in the circumferential direction. ing.

  Preferably, a protruding portion that protrudes toward the inner frame is provided on the inner peripheral portion of the outer frame, and the protruding portion of the outer frame covers at least a part of the outer peripheral edge of the inner frame in the circumferential direction. Is formed.

  Preferably, the outer peripheral portion of the inner frame is provided with a protruding portion that protrudes toward the outer frame, and the resin member is disposed between the protruding portion of the outer frame and the protruding portion of the inner frame in the rotation axis direction. Has been placed.

  According to another aspect of the present invention, an axial fan includes an outer frame, an inner frame disposed inside the outer frame, a motor supported with respect to the inner frame, an impeller attached to the motor, A resin member, and an inner peripheral portion of the outer frame is provided with a protruding portion that protrudes toward the inner frame, and an outer peripheral portion of the inner frame is provided with a protruding portion that protrudes toward the outer frame. The protrusion of the outer frame and the protrusion of the inner frame are at different positions in the direction of the rotation axis of the motor, and in the rotation axis direction, between the protrusion of the outer frame and the protrusion of the inner frame, A resin member is disposed.

  According to these inventions, an axial fan that can reduce vibration can be provided.

1 is a perspective view of an axial fan according to one embodiment of the present invention. It is a top view of an axial flow fan. It is a disassembled perspective view of an axial flow fan. It is a perspective view which shows the cross section in the AA of FIG. It is the sectional view on the AA line of FIG. It is sectional drawing which shows an example of the structure of the motor part applicable to this Embodiment.

  Hereinafter, an axial fan according to an embodiment of the present invention will be described.

  In addition, the direction of the coordinate shown in each figure is mutually common. The X axis, the Y axis, and the Z axis are orthogonal to each other.

  [Embodiment]

  FIG. 1 is a perspective view of an axial fan according to one embodiment of the present invention. FIG. 2 is a plan view of the axial fan. FIG. 3 is an exploded perspective view of the axial fan.

  As shown in FIG. 1, the axial fan 1 includes an impeller 20, an inner frame 30, an outer frame 40, and a motor 10 disposed inside the impeller 20. As shown in FIG. 3, the axial fan 1 has two resin members 51 and 52. The axial fan 1 has a rectangular parallelepiped shape as a whole. The inner frame 30 is disposed inside the outer frame 40. The motor 10 is supported with respect to the inner frame 30. The impeller 20 is attached to the motor 10 and supported by the inner frame 30 so as to be rotatable with respect to the inner frame 30. The motor 10 rotates the impeller 20 with respect to the inner frame 30.

  The impeller 20 can rotate around the rotation shaft 2. The rotation axis 2 is parallel to the Z axis. In the figure, the position through which the rotary shaft 2 passes is indicated by a symbol. Hereinafter, the Z-axis direction may be referred to as the rotation axis direction. The XY plane of the coordinates shown in FIG. 1 is a plane perpendicular to the rotation axis direction.

  The impeller 20 includes a hub portion 21 and a plurality of blades 23 arranged around the rotation shaft 2 (in the circumferential direction). A plurality of blades 23 are connected to the hub portion 21. In the present embodiment, for example, three blades 23 are arranged at substantially equal intervals in the circumferential direction. In the impeller 20, for example, a hub portion 21 and a plurality of blades 23 are integrally formed by injection molding of a thermoplastic resin. However, the present invention is not limited to this, and the blade 23 formed of a known resin or the like may be attached to the hub portion 21 by a known method.

  The axial fan 1 rotates the impeller 20 so that, for example, a gas such as air becomes negative in the Z axis when viewed from the origin of the coordinates shown in FIG. 1 (the upper side of the axial fan 1 in FIG. 1). It is comprised so that it can ventilate in the direction which faced to the downward side. That is, the surface shown in FIG. 2 is a surface on the intake side of the axial fan 1 (hereinafter sometimes referred to as an upper surface). A surface on the back side in FIG. 2 is a surface on the exhaust side of the axial fan 1. The intake side surface may be an intake port in the axial fan, and the exhaust side surface may be an exhaust port in the axial fan.

  The inner frame 30 is formed in a substantially square shape when viewed from the rotation axis direction. The inner frame 30 includes a casing 35 and two attachments 31 and 32 attached around the casing 35.

  In the present embodiment, the casing 35, the impeller 20, and the motor 10 constituting the inner frame 30 constitute a general-purpose axial fan. That is, by attaching attachments 31 and 32 to a general-purpose axial fan, the configuration of the sub-assembly of the axial fan 1 according to the present embodiment in which the inner frame 30, the impeller 20, and the motor 10 are combined. can get. In addition, the inner frame may be comprised by one components, such as an integrally molded product, for example.

  The casing 35 has a cylindrical shape having a substantially circular hole when viewed from the rotation axis direction. An impeller 20 is housed inside the hole. In other words, the casing 35 surrounds the side portion of the impeller 20.

  On the upper surface of the casing 35, an upper flange portion 35a is formed on a side portion. In addition, a lower flange portion 35 b is formed on a side portion of the lower surface of the casing 35. The upper flange portion 35a and the lower flange portion 35b are each formed in a substantially square shape when viewed from the rotation axis direction. The upper flange portion 35 a and the lower flange portion 35 b are formed such that four corner portions protrude from the cylindrical portion of the casing 35 in a direction (radial direction) perpendicular to the rotation shaft 2.

  The attachments 31 and 32 have the same shape. The attachment 31 has a pillar part 31c and two half pillar parts 31d. Each half pillar part 31d is connected to the pillar part 31c via the inner frame protrusion part 31a. Moreover, the attachment 32 has the pillar part 32c and the two half pillar parts 32d. Each half pillar part 32d is connected to the pillar part 32c via the inner frame protrusion part 32a. The column portions 31c and 32c and the half column portions 31d and 32d are formed such that the direction parallel to the rotation axis 2 is the longitudinal direction. The longitudinal dimension of the column parts 31c and 32c and the half pillar parts 31d and 32d is substantially the same as the dimension between the upper flange part 35a and the lower flange part 35b.

  The attachments 31 and 32 are combined and attached to the casing 35. At this time, the two pairs of half pillars 31d and 32d are combined with each other. When the half pillar portion 31d and the half pillar portion 32d are combined, the shape is similar to that of the pillar portion 31c. That is, when the attachments 31 and 32 are combined, the pillar portion 31c or a portion having the same shape can be formed in four places. These four portions are disposed between the upper flange portion 35a and the lower flange portion 35b that protrude from the cylindrical portion.

  A hole 39 is formed in the vicinity of each of the four corners of the inner frame 30 when viewed from the rotation axis direction. The hole 39 is a through hole. With the attachments 31 and 32 attached to the casing 35, the holes provided in the upper flange portion 35a and the lower flange portion 35b and the pillar portions 31c and 32c or the half pillar portions 31d and 32d are provided. A hole 39 that overlaps with the hole and penetrates from the upper surface to the lower surface is formed. For example, bolts and nuts may be arranged in the hole 39 so that the attachments 31 and 32 can be fixed to the casing 35. However, the present invention is not limited to this, and any known means may be used. Can be used.

  The inner frame protruding portion 31a is disposed substantially at the center of the attachment 31 in the rotation axis direction, and is formed so as to extend in a direction perpendicular to the rotation axis 2 from the column portion 31c to the half column portion 31d. . In the example shown in the drawing, the inner frame protruding portion 31a connects the two half pillar portions 31d adjacent to the pillar portion 31c. Similarly, the inner frame protruding portion 32a is disposed at the approximate center of the attachment 32 in the rotation axis direction, and is formed to extend in a direction perpendicular to the rotation axis 2 from the column portion 32c to the half column portion 32d. Has been. In the example shown in the drawing, the inner frame protrusion 32a connects the two half pillars 32d adjacent to the pillar 32c. The inner frame protruding portions 31a and 32a protrude from the side surface portion of the inner frame 30 formed by the column portions 31c and 32c or the half column portions 31d and 32d and the side surface of the casing 35 toward the outer frame 40 and outward. It is formed to overhang. In other words, in the rotation axis direction, inner frame protrusions 31 a and 32 a protruding from other parts in a direction perpendicular to the rotation axis 2 are provided in a part of the substantially central portion of the side surface portion of the inner frame 30. ing. The inner frame protruding portion 31a is a connecting portion that connects the column portion 31c and the half column portion 31d in the circumferential direction, and the inner frame protruding portion 32a is the column portion 32c and the half column portion in the circumferential direction. It is a connecting part that connects 32d.

  The two resin members 51 and 52 have an annular shape whose outer shape is substantially square when viewed from the rotation axis direction. The shapes of the two resin members 51 and 52 are substantially the same. In the present embodiment, the resin members 51 and 52 are non-foaming and elastic members such as rubber.

  The outer frame 40 is formed in a substantially square shape when viewed from the rotation axis direction. The outer frame 40 includes an upper outer frame 41 and a lower outer frame 42. The upper outer frame 41 and the lower outer frame 42 have the same shape. The upper outer frame 41 and the lower outer frame 42 each have a substantially square annular portion having a size that surrounds the upper surface and the lower surface of the inner frame 30. Each of the upper outer frame 41 and the lower outer frame 42 has two side wall portions that rise in the rotation axis direction from two pieces of the annular portion. The upper outer frame 41 and the lower outer frame 42 are combined to form a rectangular parallelepiped outer frame 40 whose upper surface side and lower surface side each open in a square shape and whose four side surfaces are covered with side wall portions. The outer frame 40 includes openings 41 e and 42 e corresponding to the outer shape of the inner frame 35, and these openings 41 e and 42 e are formed on the upper surface of the upper outer frame 41 and the lower surface of the lower outer frame 42.

  In the present embodiment, two projecting portions 41c and 42c are formed in the annular portions of the upper outer frame 41 and the lower outer frame 42, respectively. In addition, two concave portions 41 d and 42 d are formed at the end portions of the side wall portions of the upper outer frame 41 and the lower outer frame 42. The upper outer frame 41 and the lower outer frame 42 are combined in a state of being positioned with respect to each other such that the protrusion 41c and the recess 42d are engaged and the protrusion 42c and the recess 41d are engaged.

  A hole 49 is formed in the vicinity of each of the four corners of the outer frame 40 when viewed from the rotation axis direction. The hole 49 is a through hole. In a state where the upper outer frame 41 and the lower outer frame 42 are combined, holes provided in the upper outer frame 41 and the lower outer frame 42 overlap to form a hole portion 49 penetrating from the upper surface to the lower surface. Is done. The axial fan 1 can be attached to the housing of the external device by passing a bolt or the like through the hole 49 and fixing the outer frame 40 to the housing or the like of the external device. In addition, the attachment method to the external apparatus of the axial fan 1 is not restricted to this.

  The annular portions of the upper outer frame 41 and the lower outer frame 42 are outer frame protruding portions 41a and 42a formed so as to protrude inward from the respective side wall portions. In other words, the outer frame protrusion 41 a is formed at the upper end of the outer frame 40 so as to protrude toward the rotating shaft 2. Further, an outer frame protruding portion 42 a is formed at the lower end portion of the outer frame 40 so as to project toward the rotating shaft 2.

  4 is a perspective view showing a cross section taken along line AA of FIG. 5 is a cross-sectional view taken along line AA in FIG.

  4 and 5, illustration of the internal structure of the motor 10 and the hub portion 21 is omitted.

  As shown in FIG. 4, the hub portion 21 has a cylindrical side peripheral surface. The motor 10 is held by a motor base portion 35 f disposed at a position on the exhaust side inside the casing 35. The motor base portion 35f is fixed by being connected to a portion around the casing 35 via several spokes 35g. The spoke 35g connects the end portion on the exhaust side of the casing 35 and the motor base portion 35f. That is, the axial fan 1 has a configuration in which a part of the air passage is blocked by the spokes 35g on the exhaust side. The impeller 20 is attached to the casing 35 from the intake side. The spoke 35g may be a connecting portion that connects the end portion on the exhaust side of the casing 35 and the motor base portion 35f, or may be a fixed wing.

  In the present embodiment, the outer frame 40 and the inner frame 30 are arranged so as not to contact each other (in a non-contact state). That is, the portions of the casing 35 and the attachments 31 and 32 excluding the inner frame protrusions 31a and 32a are arranged on the inner side of the side wall portion of the outer frame 40, and between the outer frame 40 and the inner frame 30, An annular gap formed so as to surround the rotating shaft 2 of the impeller 20 is provided.

  Here, the upper flange portion 35a is disposed inside the outer frame protruding portion 41a provided on the upper side of the outer frame 40 and at a position not in contact with the outer frame protruding portion 41a. The lower flange portion 35b is disposed inside the outer frame protruding portion 42a provided on the lower side of the outer frame 40 and at a position not in contact with the outer frame protruding portion 42a. In other words, the outer frame projecting portions 41 a and 42 a project inward from the side wall portion of the outer frame 40 when viewed from the rotation axis direction, and cover a part of the annular gap between the outer frame 40 and the inner frame 30. It is formed in an annular shape.

  Further, the portions of the attachments 31 and 32 excluding the casing 35 and the inner frame protrusions 31 a and 32 a are arranged inside the outer frame protrusions 41 a and 42 a and the side walls of the outer frame 40. Outer peripheral edge portions (end portions away from the rotation shaft 2) 31b, 32b of the inner frame protrusions 31a, 32a are located on the inner side of the side wall portion of the outer frame 40, and the outer frame protrusions 41a, 42a Inner peripheral edge portions (end portions close to the rotation shaft 2) 41b and 42b are located outside. In other words, the outer frame protrusions 41 a and 42 a are formed so as to cover at least a part of the outer peripheral edge of the inner frame 30 when viewed from the rotation axis direction.

  Thus, in the annular gap provided between the outer frame 40 and the inner frame 30, the outer frame protruding portion 41a, the inner frame protruding portions 31a and 32a, and the outer frame protruding portion 42a are arranged in the rotation axis direction. By being provided at different positions, a so-called labyrinth structure is formed in which the upper surface of the axial flow fan 1 and the lower surface of the axial flow fan 1 are stepped in a direction perpendicular to the rotation axis direction. This reliably prevents the inner frame 30 and the impeller 20 from coming off in the rotation axis direction with respect to the outer frame 40 even when the static pressure is high.

  The resin members 51 and 52 are arranged so as to close the annular gap between the outer frame 40 and the inner frame 30. The resin members 51 and 52 support the inner frame 30 with respect to the outer frame 40 while being sandwiched between the inner frame 30 and the outer frame 40 so that the inner frame 30 does not contact the outer frame 40.

  In the present embodiment, the resin members 51 and 52 are disposed between the outer frame protruding portions 41a and 42a and the inner frame protruding portions 31a and 32a in the rotation axis direction. That is, the resin member 51 is disposed between the outer frame protruding portion 41a and the inner frame protruding portions 31a and 32a in the rotation axis direction. The resin member 51 is formed so that a cross section parallel to the rotation axis 2 has a rectangular shape. The lower surface of the outer frame protruding portion 41a, the inner surface of the side wall portion of the outer frame 40, and the inner frame protruding. It arrange | positions in the space enclosed by the upper surface of the parts 31a and 32a and the outer peripheral surface of the inner frame 30 except the inner frame protrusion parts 31a and 32a. Further, the resin member 52 is disposed between the inner frame protruding portions 31a and 32a and the outer frame protruding portion 42a in the rotation axis direction. The resin member 52 is formed so that a cross section parallel to the rotation shaft 2 has a rectangular shape, and includes a lower surface of the inner frame protrusions 31a and 32a, an inner surface of the side wall portion of the outer frame 40, an outer surface, It arrange | positions in the space enclosed by the upper surface of the frame protrusion part 42a, and the outer peripheral surface of the inner frame 30 except inner frame protrusion part 31a, 32a. By arranging the resin members 51 and 52 in this manner, the inner frame 30 can be positioned in the vertical direction with respect to the outer frame 40 in both the vertical direction and the direction perpendicular to the rotation axis 2. It is held so as not to touch.

  In general, when the rotational speed of an axial fan increases, vibration in the direction of the rotational axis generated due to vibration of the impeller of the axial fan in the direction of the rotational axis may increase. In particular, an axial fan used in an apparatus such as a server tends to rotate at high speed so that the maximum static pressure is about 1000 to 1400 Pascals or 1400 Pascals or more. On the other hand, an axial fan used in such a server or the like may be required to comply with strict standards regarding vibration. In other words, the axial fan is required to satisfy both the requirements regarding vibration and the requirements regarding PQ characteristics (air flow static pressure characteristics), which are in a contradictory relationship, at a high level.

  With respect to such a viewpoint, in the axial fan 1 according to the present embodiment, the impeller 20 and the motor 10 are attached to the inner frame 30 supported with respect to the outer frame 40 via the resin members 51 and 52. Therefore, the excitation force transmitted from the impeller 20 or the motor 10 to the inner frame 30 is attenuated via the resin members 51 and 52 and then transmitted to the outer frame 40. Therefore, even if the rotational speed is high, the generated excitation force is not easily transmitted to the outer frame 40, and the vibration generated in the axial fan 1 is reduced.

  In addition, when the rotational speed of the axial fan is increased, the vibration generated in the axial fan is relatively large in all directions, and in particular, the vibration in the radial direction or the circumferential direction is relatively larger than the vibration in the rotational axis direction (Z direction). There is a case. Even in such a case, according to the present embodiment, even if the rotational speed of the axial fan 1 is increased, vibration in the radial direction or circumferential direction can be reduced rather than vibration in the rotation axis direction (Z direction). it can.

  Since the resin members 51 and 52 are non-foaming members having elasticity, gas can be prevented from passing through the resin members 51 and 52. By arranging the resin members 51 and 52 of such a member between the outer frame 40 and the inner frame 30, it is possible to make it difficult for gas to flow between the outer frame 40 and the inner frame 30, The PQ characteristic of the axial fan 1 can be improved. Further, a complicated gap is provided between the outer frame 40 and the inner frame 30 as in a so-called labyrinth structure, and resin members 51 and 52 are arranged in the gap. Therefore, the gas can be made difficult to flow between the outer frame 40 and the inner frame 30, and the PQ characteristic of the axial fan 1 can be improved.

  In the axial fan 1 according to the present embodiment, it is possible to make it difficult for vibration generated with the rotation of the impeller 20 to be transmitted to the outer frame 40. Therefore, even if the balancing process of the impeller 20 is simplified or omitted in the manufacturing process of the axial fan 1, the vibration generated in the axial fan 1 can be suppressed. It can be produced at low cost.

  FIG. 6 is a cross-sectional view showing an example of the structure of a portion of the motor 10 applicable to the present embodiment.

  As shown in FIG. 6, the hub portion 21 has a cup shape with the gas suction side covered. The side peripheral part of the hub part 21 is cylindrical. The opening in the side periphery of the hub 21 is closed by a support surface that supports the shaft of the motor 10 to be described later. This shaft constitutes a rotating shaft.

  As shown in FIG. 6, the motor 10 is of the outer rotor type. The motor 10 roughly includes a rotor part 11 and a stator part 15.

  The rotor unit 11 includes a rotor yoke 12, a magnet 13, and a shaft 14. The rotor yoke 12 is fixed inside the hub portion 21. The rotor yoke 12 is formed of a ferromagnetic member such as iron. The rotor yoke 12 has a cylindrical shape with one side closed, that is, a cup shape. The magnet 13 is an annular magnet and is attached to the inner surface of the rotor yoke 12.

  The shaft 14 is fixed to the center portion of the support surface of the hub portion 21 so as to protrude toward the exhaust side when viewed from the rotation axis direction. The shaft 14 is rotatably supported with respect to the motor 10 in a state where the shaft 14 is inserted into a bearing portion 19 fixed to a support portion located at the center of the motor base portion 35f. The impeller 20 rotates about the shaft 14 as the rotation axis 2. That is, the impeller 20 is held rotatably with respect to the inner frame 30 in a state where the shaft 14 is supported by the motor 10.

  The stator unit 15 includes a stator core 16 and a coil 17. The stator portion 15 is disposed around the shaft 14 so that the stator core 16 faces the magnet 13. A plurality of coils 17 are wound around the stator core 16 via insulators. As a result, the impeller 20 rotates as a current flows through the coil 17.

  Note that the circuit board 18 is disposed below the stator unit 50. A drive circuit for the motor 10 is mounted on the circuit board 18. The circuit board 18 is electrically connected to the coil 17. The circuit board 18 supplies electric power for driving the motor 10 from the drive circuit to the coil 17 to rotate the impeller 20.

  Note that the structure of the inside of the hub portion 21 and the like is not limited to this, and various structures can be employed. For example, the circuit board 18 may not be provided.

  [Others]

  Various shapes of the various members can be changed. Each of the outer frame and the inner frame may be composed of a single member. Further, each of the outer frame and the inner frame may be configured by combining a larger number of members than in the above-described embodiment.

  Any or all of the protruding portion protruding from the outer frame toward the inner frame and the protruding portion protruding from the inner frame toward the outer frame may not be provided. By providing a resin member that supports the inner frame with respect to the outer frame so that the inner frame does not contact the outer frame between the outer frame and the inner frame, vibration can be suppressed and PQ characteristics can be improved. Both can be realized.

  One resin member may be used, or three or more members may be provided. It does not necessarily have to be an annular shape, as long as it is arranged to support the inner frame with respect to the outer frame. The material of the resin member is not limited to a non-foaming material. Even if it is foamable, the PQ characteristics can be improved by adopting, for example, a structure in which the protrusions of the outer frame and the protrusions of the inner frame are provided as described above.

  A member in which two or more different materials are combined may be used as the resin member. For example, you may make it use the member etc. by which the circumference | surroundings of the core part of the foamable raw material were enclosed with the non-foamable raw material.

  The motor may be of an inner rotor type. In this case, the diameter of the hub portion can be reduced.

  The outer frame may not have a rectangular parallelepiped shape. When each of the outer frame and the inner frame has a square or a rectangle as viewed from the rotation axis direction, each side of the outer frame and each side of the inner frame do not necessarily have to be parallel. Each shape of the outer frame, the inner frame, and the housing to which the impeller is attached is not limited to a square shape when viewed from the axial direction, and may be a rectangle or a circle.

  As the resin member, a member provided to suspend the inner frame with respect to the outer frame may be used. In addition to the resin member that supports the inner frame in this way, a seal member that is provided so as to close the gap between the outer frame and the inner frame is further provided so that vibration can be suppressed and higher PQ characteristics can be obtained. May be.

  In the above-described embodiment, the outer frame 40, the attachments 31 and 32, and the resin members 51 and 52 are attached around the casing of a general-purpose axial fan, and a shaft capable of realizing suppression of vibration and improvement of PQ characteristics. You may make it comprise a flow fan.

  In the above-described embodiment, the intake port and the exhaust port may be reversed. In this case, the rotation direction of the impeller is reversed.

In the above-described embodiment, with the attachments 31 and 32 attached to the casing 35, the holes provided in the upper flange portion 35a and the lower flange portion 35b, and the column portions 31c and 32c or the half column portion, respectively. The holes provided in 31d and 32d overlap with each other to form a hole 39 that penetrates from the upper surface to the lower surface. The hole 39 may have a shape other than the through hole. For example, one end portion of the both end portions of the hole portion 39 is an insertion port (opening) into which the fastening member is inserted. In order to suppress the entry and exit of air, the other end of the hole 39 may be a lid.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Axial fan 2 Rotating shaft 10 Motor 14 Shaft 20 Impeller 30 Inner frame 31, 32 Attachment 31a, 32a Inner frame protrusion part 35 Casing 40 Outer frame 41 Upper outer frame 41a Outer frame protrusion part 42 Lower outer frame 42a Outer frame Protrusion 51,52 Resin member

Claims (7)

An outer frame,
An inner frame disposed inside the outer frame;
A motor supported against the inner frame;
An impeller attached to the motor;
A non-foaming resin member disposed between the outer frame and the inner frame;
The inner frame is an axial fan supported with respect to the outer frame via the non-foaming resin member.   The axial fan according to claim 1, wherein the resin member is an elastic member. Between the outer frame and the inner frame, an annular gap formed so as to surround the rotating shaft of the impeller is disposed,
The axial fan according to claim 1, wherein the resin member closes the annular gap. A projecting portion that projects toward the inner frame is provided on the inner peripheral portion of the outer frame,
The axial flow fan according to claim 3, wherein the protruding portion of the outer frame is formed in an annular shape so as to cover a part of the gap in the circumferential direction. A projecting portion that projects toward the inner frame is provided on the inner peripheral portion of the outer frame,
The axial flow fan according to claim 3, wherein the protruding portion of the outer frame is formed to cover at least a part of the outer peripheral edge of the inner frame in the circumferential direction. Protruding portions that protrude toward the outer frame are provided on the outer periphery of the inner frame,
6. The axial fan according to claim 4, wherein the resin member is disposed between a protruding portion of the outer frame and a protruding portion of the inner frame in the rotation axis direction. An outer frame,
An inner frame disposed inside the outer frame;
A motor supported against the inner frame;
An impeller attached to the motor;
A resin member,
A projecting portion that projects toward the inner frame is provided on the inner peripheral portion of the outer frame,
Protruding portions that protrude toward the outer frame are provided on the outer periphery of the inner frame,
The protruding portion of the outer frame and the protruding portion of the inner frame are at different positions in the direction of the rotation axis of the motor,
An axial fan in which the resin member is disposed between a protruding portion of the outer frame and a protruding portion of the inner frame in the rotation axis direction.

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