WO2025027968A1 - 送風機 - Google Patents

送風機 Download PDF

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Publication number
WO2025027968A1
WO2025027968A1 PCT/JP2024/017212 JP2024017212W WO2025027968A1 WO 2025027968 A1 WO2025027968 A1 WO 2025027968A1 JP 2024017212 W JP2024017212 W JP 2024017212W WO 2025027968 A1 WO2025027968 A1 WO 2025027968A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
blades
axial direction
intake port
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/017212
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
博文 小路
景 久保田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MinebeaMitsumi Inc
Original Assignee
MinebeaMitsumi Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MinebeaMitsumi Inc filed Critical MinebeaMitsumi Inc
Priority to CN202480049956.2A priority Critical patent/CN121605249A/zh
Priority to JP2025537675A priority patent/JPWO2025027968A1/ja
Publication of WO2025027968A1 publication Critical patent/WO2025027968A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

Definitions

  • This disclosure relates to a blower.
  • the axial fans described in Patent Documents 1 to 3 include an impeller with rotor blades and a casing that houses the impeller.
  • the casing is formed with an intake port and an exhaust port.
  • the impeller rotates, air flowing in from the intake port flows through a flow path inside the casing and is exhausted from the exhaust port.
  • the inner diameter at a position farther from the intake port is larger than the inner diameter at a position closer to the intake port.
  • the outer diameter of the outer peripheral edge of the rotor blades at a position farther from the intake port is larger than the outer diameter of the outer peripheral edge of the rotor blades at a position closer to the intake port.
  • One of the performance requirements for a blower is air volume. Increasing the impeller rotation speed can increase the air volume, but this can lead to increased noise.
  • the objective of this disclosure is to provide a blower that can ensure sufficient airflow while suppressing noise increases.
  • a blower includes: a casing including an intake port and an exhaust port, the casing having a flow path formed therein that communicates from the intake port to the exhaust port; An impeller disposed within the casing and rotatable about an axis, A hub portion disposed on the intake port side; A plurality of blades formed on the hub portion; the impeller including a cylindrical portion extending from the hub portion toward the exhaust port side and forming a flow passage between the cylindrical portion and the casing; a plurality of fixed vanes extending in a radial direction from an inner peripheral surface of the casing toward an outer peripheral surface of the cylindrical portion of the impeller; the casing includes an expanding diameter portion having an inner circumferential surface whose inner diameter expands from the intake port side toward the exhaust port side, a maximum outer diameter of the plurality of blades is greater than a minimum inner diameter of the expanded diameter portion, a position of a minimum inner diameter of the expanded diameter portion is located closer to the intake port in the axial direction than a position
  • the present disclosure provides a blower that can ensure sufficient airflow while suppressing increases in noise.
  • FIG. 1 is a perspective view showing a casing of a blower according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the axial direction of the blower according to the embodiment.
  • FIG. 3 is an enlarged cross-sectional view showing the first casing and the impeller.
  • FIG. 4 is an enlarged cross-sectional view of a portion of the blower.
  • FIG. 5 is a front view of the impeller.
  • FIG. 6 is an enlarged cross-sectional view showing a flow passage between the cylindrical portion and the casing.
  • FIG. 7 is a cross-sectional view of a rotor blade.
  • FIG. 8 is an enlarged cross-sectional view showing the flow passage between the cylindrical portion and the casing, and is a diagram showing the positional relationship between the moving blades and the fixed blades.
  • FIG. 9 is a diagram showing the positional relationship in the Z-axis direction of the rotor blades and the fixed blades of the blower according to the first modified example.
  • FIG. 10 is a diagram showing the positional relationship in the Z-axis direction of the rotor blades and the fixed blades of the blower according to the second modified example.
  • FIG. 1 is a perspective view showing a casing 10 of a blower 100 according to an embodiment.
  • FIG. 2 is a cross-sectional view along the axial direction of the blower 100 according to an embodiment.
  • FIG. 3 is a cross-sectional view showing an enlarged view of a first casing 110 and an impeller 20.
  • the Z-axis direction is the direction in which the shaft 15 extends.
  • the X-axis direction and the Y-axis direction are along the radial direction.
  • the shaft 15 is an example of an axis. When simply described as "axial direction”, it is the direction in which the shaft 15 extends. When simply described as "radial direction”, it is the radial direction of the shaft 15, which is a direction perpendicular to the axial direction.
  • the terms “upper” and “lower” may be used.
  • the upper and lower directions are the directions in which the shaft 15 extends, with the side closer to the intake port 11 being “upper” and the side closer to the exhaust port 12 being “lower.” Note that the actual arrangement of the blower 100 may or may not follow this.
  • the shaft 15 may be arranged along the vertical direction, or along the horizontal direction.
  • intake port side and “exhaust port side” may be used.
  • the “intake port side” is the side closer to the intake port.
  • the “exhaust port side” is the side closer to the exhaust port.
  • the blower (fan) 100 shown in Figures 1 to 3 is a blower that can be used to cool electronic devices such as servers.
  • the blower 100 is attached to the housing of the electronic device and can supply air to the inside of the housing to cool the electronic device inside the housing.
  • the use of the blower 100 is not limited to cooling electronic devices, and the blower 100 can be used for other purposes.
  • the blower 100 is capable of blowing air.
  • the blower 100 may blow gas other than air.
  • the blower 100 includes a casing 10, a shaft 15, an impeller 20, a base 50, and a motor 60.
  • the blower 100 includes a plurality of moving blades 30 formed on the impeller 20, and fixed blades 70 formed on the inner circumferential surface of the casing 10.
  • the impeller 20 includes a hub portion 21, a plurality of moving blades 30, and a cylindrical portion 40.
  • the casing 10 is formed with an intake port 11 and an exhaust port 12.
  • the casing 10 has a first casing 110 and a second casing 120.
  • the first casing 110 and the second casing 120 are connected in the Z-axis direction.
  • the first casing 110 is formed with the intake port 11, and the second casing 120 is formed with the exhaust port 12.
  • the intake port 11 and the exhaust port 12 face each other in the Z-axis direction.
  • the casing 10 may be formed to form a rectangular parallelepiped.
  • the casing 10 may be formed to form a cube.
  • the casing 10 may be formed to form a cylinder, or may have another shape.
  • the casing 10 may be formed with a flange or a bracket.
  • a flow path 130 is formed that runs from the intake port 11 toward the exhaust port 12.
  • the flow path 130 includes flow paths 131 and 132 that communicate with each other in the Z-axis direction.
  • the flow path 131 communicates with the intake port 11, and the flow path 132 communicates with the exhaust port 12.
  • the flow path 132 is a flow path downstream of the flow path 131. Note that in the Z-axis direction, the side closer to the intake port 11 is referred to as "upstream” and the side closer to the exhaust port 12 is referred to as "downstream.” In addition, in the Z-axis direction, the side closer to the intake port 11 may be referred to as "front” and the side closer to the exhaust port 12 as "rear.”
  • the first casing 110 has an intake port 11 formed therein.
  • a flow path 131 is formed inside the first casing 110.
  • the first casing 110 has an opening that is continuous in the Z-axis direction.
  • the inner circumferential surface 111 of the first casing 110 is formed to form a circle when viewed in the Z-axis direction.
  • the first casing 110 houses the impeller 20.
  • the first casing 110 houses a portion of the shaft 15 that is closer to the intake port 11, a portion of the tubular portion 40 that is closer to the intake port 11, and a portion of the motor 60 that is closer to the intake port 11.
  • the second casing 120 has an exhaust port 12 formed therein.
  • a flow path 132 is formed inside the second casing 120.
  • the second casing 120 has an opening that is continuous in the Z-axis direction.
  • the inner circumferential surface 121 of the second casing 120 is formed to form a circle when viewed in the Z-axis direction.
  • the second casing 120 houses the base 50.
  • the second casing 120 houses a portion of the shaft 15 that is closer to the exhaust port 12, a portion of the tube portion 40 that is closer to the exhaust port 12, and a portion of the motor 60 that is closer to the exhaust port 12.
  • the intake port 11 and the exhaust port 12 are formed at positions facing each other in the Z-axis direction.
  • the inner diameter ID11 of the intake port 11 is smaller than the inner diameter ID12 of the exhaust port 12, for example.
  • the intake port 11 may be the most upstream end of the flow path 130.
  • the exhaust port 12 may be the most downstream end of the flow path 130.
  • the inner diameter ID11 of the intake port 11 may be larger than the inner diameter ID12 of the exhaust port 12 or may be the same as the inner diameter ID12 of the exhaust port 12.
  • a portion having an inner diameter narrower than the inner diameter ID11 is formed downstream of the intake port 11.
  • the first casing 110 includes an expanded diameter portion 115.
  • the expanded diameter portion 115 includes a portion of the inner circumferential surface 111 that is formed so as to increase in distance from the center in the radial direction.
  • the center in the radial direction is the position of the shaft 15.
  • the center in the radial direction may be a position on an extension line of the shaft 15.
  • the inner diameter of the enlarged diameter portion 115 is larger at a position farther from the intake port 11 than at a position closer to the intake port 11. As shown in FIG. 3, the enlarged diameter portion 115 is formed from position P1 to position P2 in the Z-axis direction. The inner diameter ID13 of the inner surface of the enlarged diameter portion 115 at position P1 is smaller than the inner diameter ID14 of the inner surface 111 of the enlarged diameter portion 115 at position P2.
  • the inner diameter ID13 of the inner surface 111 of the expanded portion 115 at position P1 is the smallest inner diameter of the inner diameters of the inner surface 111 of the expanded portion 115.
  • the inner diameter ID14 of the inner surface 111 of the expanded portion 115 at position P2 is the largest inner diameter of the inner diameters of the inner surface 111 of the expanded portion 115.
  • the inner diameter ID13 of the inner surface of the expanded portion 115 at position P1 is smaller than the inner diameter ID11 of the intake port 11.
  • the inner diameter ID14 of the inner surface 111 of the expanded portion 115 at position P2 is the same as the inner diameter ID12 of the exhaust port 12. "Same” includes "almost the same.”
  • FIG. 4 is an enlarged cross-sectional view of a portion of the blower 100.
  • the shaft 15 extends in the Z-axis direction.
  • the shaft 15 is a rotating shaft of the motor 60.
  • the shaft 15 is rotatably supported by the casing 10.
  • the shaft 15 has an end 15a and an end 15b.
  • the ends 15a and 15b are ends of the shaft 15 in the longitudinal direction.
  • the end 15a is disposed closer to the intake port 11, and the end 15b is disposed closer to the exhaust port 12.
  • the blower 100 includes a pair of bearings 16, 17 that rotatably support the shaft 15.
  • the bearings 16, 17 are arranged apart from each other in the Z-axis direction.
  • the bearing 16 is arranged closer to the intake port 11, and the bearing 17 is arranged closer to the exhaust port 12.
  • FIG. 5 is a front view of the impeller 20.
  • Fig. 6 is an enlarged cross-sectional view of the flow passage 130 between the cylindrical portion 40 and the casing 10.
  • Fig. 7 is a cross-sectional view of the rotor blade 30.
  • Fig. 8 is an enlarged cross-sectional view of the flow passage 130 between the cylindrical portion 40 and the casing 10, and shows the positional relationship between the rotor blade 30 and the fixed blade 70.
  • the impeller 20 includes a hub portion 21, a plurality of rotor blades 30, and a tubular portion 40, as described above.
  • the outer peripheral surface 22 of the hub portion 21 includes an inclined surface that is inclined with respect to the Z-axis direction.
  • the outer diameter of the outer peripheral surface 22 on the upstream side of the impeller 20 is smaller than the outer diameter of the outer peripheral surface 22 on the downstream side of the impeller 20.
  • the outer diameter of the outer peripheral surface 22 on the downstream side is larger than the outer diameter of the outer peripheral surface 22 on the upstream side. Note that the upstream side is closer to the intake port 11 in the Z-axis direction, and the downstream side is closer to the exhaust port 12.
  • a gap is formed between the outer peripheral surface 22 of the hub portion 21 and the inner peripheral surface 111 of the first casing 110.
  • the gap between the outer peripheral surface 22 of the impeller 20 and the inner peripheral surface 111 of the first casing 110 is a flow path 131.
  • the outer diameter of the outer peripheral surface 22 of the hub portion 21 increases from upstream to downstream in the Z-axis direction. As shown in Fig. 3, the outer diameter OD11 of the outer peripheral surface 22 of the hub portion 21 closer to the intake port 11 is smaller than the outer diameter OD12 of the outer peripheral surface 22 of the hub portion 21 farther from the intake port 11. The outer diameter OD12 is shown in Fig. 6.
  • the outer diameter OD11 of the hub portion 21 may be the outer diameter at a position closest to the intake port 11 in the Z-axis direction.
  • the outer diameter OD11 of the hub portion 21 may be the minimum outer diameter of the hub portion 21.
  • the outer diameter OD11 may be, for example, the outer diameter at the tip 21a of the hub portion 21.
  • the tip 21a of the hub portion 21 is located closest to the intake port 11 in the Z-axis direction.
  • the tip 21a of the hub portion 21 is located away from the intake port 11 in the Z-axis direction.
  • the position of the outer diameter OD11 is located, for example, between positions P1 and P2.
  • the tip 21a of the hub portion 21 is located inside the enlarged diameter portion 115 of the first casing 110 in the Z-axis direction.
  • the outer diameter OD12 shown in FIG. 6 may be, for example, the outer diameter at the rear end 21b of the hub portion 21.
  • the rear end 21b of the hub portion 21 is located at a position farthest from the intake port 11 in the Z-axis direction.
  • the rear end 21b of the hub portion 21 is located at a position farther from the intake port 11 than position P2 in the Z-axis direction.
  • the rear end 21b of the hub portion 21 may be located outside the expanded diameter portion 115 of the first casing 110 in the Z-axis direction.
  • the rear end 21b of the hub portion 21 may be located downstream of the expanded diameter portion 115 in the Z-axis direction, or may be located inside the expanded diameter portion 115.
  • the rear end 21b of the hub portion 21 may be located at the same position as position P2 in the Z-axis direction.
  • the distance between the outer peripheral surface 22 of the hub portion 21 and the inner peripheral surface 111 of the first casing 110 in the radial direction is narrower on the downstream side than on the upstream side.
  • the outer peripheral surface 22 is formed so as to be close to the inner peripheral surface 111 of the first casing 110 in the radial direction.
  • the width of the flow passage 131 is narrower on the downstream side than on the upstream side. In the radial direction, the width of the flow passage 131 narrows from upstream to downstream. In the radial direction, the width of the flow passage 131 is wider on the upstream side than on the downstream side.
  • the impeller 20 is directly or indirectly attached to the end 15a of the shaft 15.
  • the inclination angle ⁇ 1 of the outer peripheral surface 22 of the hub portion 21 with respect to the Z axis is greater than, for example, the inclination angle ⁇ 2 of the inner peripheral surface of the enlarged diameter portion 115 with respect to the Z axis.
  • the hub portion 21 has two inclined surfaces with different angles in a cross section along the Z-axis direction.
  • the outer peripheral surface 22 of the hub portion 21 includes two inclined surfaces, a first inclined surface 22a and a second inclined surface 22b.
  • the inclination angle ⁇ 1 is the inclination angle of the first inclined surface 22a with respect to the Z-axis.
  • the inclination angle ⁇ 3 of the second inclined surface 22b with respect to the Z-axis is smaller than the inclination angle of the first inclined surface 22a.
  • the second inclined surface 22b is located radially outside the magnet 61a of the rotor 61.
  • the second inclined surface 22b is located in a position overlapping the magnet 61a of the rotor 61 in the axial direction.
  • the magnet 61a is also called the "rotor magnet.”
  • the inclination angle ⁇ 3 of the second inclined surface 22b relative to the Z axis is smaller than the inclination angle ⁇ 1 of the first inclined surface 22a relative to the Z axis, thereby improving the PQ characteristics (static pressure - air volume characteristics).
  • the blower 100 includes a yoke 18.
  • the shaft 15 is fixed to the yoke 18.
  • the impeller 20 is fixed to an end portion 15a of the shaft 15 via the yoke 18.
  • the multiple rotor blades 30 protrude radially outward from the outer circumferential surface 22 of the hub portion 21.
  • the multiple rotor blades 30 are formed on the hub portion 21.
  • Formed on the hub portion 21 includes being formed relative to the hub portion 21.
  • the maximum outer diameter OD30 of the multiple rotor blades 30 is larger than the minimum inner diameter ID13 of the expanded diameter section 115.
  • the minimum inner diameter ID13 of the expanded diameter section 115 is smaller than the maximum outer diameter OD30 of the multiple rotor blades 30.
  • the minimum inner diameter ID13 of the expanded diameter section 115 is, for example, the inner diameter at position P1.
  • the inner surface 111 of the expanded diameter section 115 at position P1 is located radially inside the position P30 of the maximum outer diameter OD of the rotor blade 30.
  • the position P30 of the maximum outer diameter OD30 of the rotor blade 30 is the position farthest from the shaft 15 in the radial direction.
  • the maximum outer diameter OD30 of the rotor blade 30 is shown in Figures 5 and 8.
  • the position P1 of the minimum inner diameter ID13 of the enlarged diameter section 115 is closer to the intake port 11 in the Z-axis direction than the position P30 of the maximum outer diameter OD30 of the rotor blade 30 of the impeller 20.
  • the position P30 of the maximum outer diameter OD of the rotor blade 30 is located downstream in the Z-axis direction from the position P1 of the minimum inner diameter ID13 of the enlarged diameter section 115.
  • the maximum outer diameter OD30 of the rotor blade 30 is smaller than the inner diameter ID14 at position P2 of the enlarged diameter section 115.
  • the multiple moving blades 30 protrude further toward the intake port 11 than the hub portion 21 in the Z-axis direction.
  • the multiple moving blades 30 protrude further upstream than the tip 21a of the hub portion 21 in the Z-axis direction.
  • the tips 31 of the multiple moving blades 30 in the Z-axis direction are positioned downstream of the position P1 of the minimum inner diameter ID13 of the expanded diameter portion 115 in the Z-axis direction.
  • the tips 31 of the moving blades 30 are positioned inside the expanded diameter portion 115 in the Z-axis direction.
  • the outer diameter of the tips 31 of the multiple moving blades 30 is smaller than the maximum outer diameter OD30.
  • the tubular portion 40 is formed so as to be continuous with the rear end 21b of the hub portion 21 of the impeller 20.
  • the outer peripheral surface of the tubular portion 40 is formed so as to be continuous with the outer peripheral surface of the rear end 21b of the hub portion 21.
  • the tubular portion 40 is disposed at a position closer to the exhaust port 12 than the hub portion 21 in the Z-axis direction.
  • the tubular portion 40 has a portion 41 and a portion 42.
  • the portion 41 is an example of a first portion of the tubular portion 40.
  • the portion 42 is an example of a second portion of the tubular portion 40.
  • the tubular portion 40 extends from the hub portion 21 toward the exhaust port 12.
  • the tubular portion 40 forms a flow path 130 between the casing 10 and the tubular portion 40.
  • Part 41 and part 42 are connected in the Z-axis direction. Part 41 and part 42 are integrally formed. In the radial direction, the shaft 15 and the motor 60 are disposed inside the cylindrical part 40. Part 41 is disposed closer to the multiple rotor blades 30 in the Z-axis direction than part 42. Part 42 is disposed farther from the multiple rotor blades 30 in the Z-axis direction than part 41.
  • a flow path 130 is formed in the radial direction between the outer peripheral surface of the tubular portion 40 and the inner peripheral surfaces 111, 121 of the casing 10.
  • the portion 41 is disposed inside the first casing 110.
  • a downstream portion of the portion 41 may be disposed inside the second casing 120.
  • the portion 42 is disposed inside the second casing 120.
  • the upstream flow path 131 of the flow path 130 includes a flow path between the outer peripheral surface of the portion 41 of the tubular portion 40 and the inner peripheral surface 111 of the first casing 110.
  • the downstream flow path 132 of the flow path 130 includes a flow path between the outer peripheral surface of the portion 41 and the inner peripheral surface 121 of the second casing 120.
  • the downstream flow path 132 includes a flow path between the outer peripheral surface of the portion 42 and the inner peripheral surface 121 of the second casing 120.
  • the flow path 131 is a flow path inside the first casing 110
  • the flow path 132 is a flow path inside the second casing 120.
  • the outer diameter OD41 of the outer peripheral surface of portion 41 is different from the outer diameter OD42 of the outer peripheral surface of portion 42.
  • the outer diameter OD42 of portion 42 is smaller than the outer diameter OD41 of portion 41.
  • a step 80 is formed on the outer peripheral surface of the tubular portion 40.
  • a step 80 is formed between the outer peripheral surfaces of portions 41 and 42. The positional relationship between the step 80 and the fixed blades 70 will be described later.
  • [base] 2 is disposed inside the second casing 120.
  • the base 50 is disposed at a position close to the exhaust port 12 in the Z-axis direction. A part of the base 50 may be disposed at the exhaust port 12.
  • the base 50 supports the motor 60 and the shaft 15.
  • the base 50 is fixed to the second casing 120, for example, via a fixed wing 70.
  • the base 50 is formed in the Z-axis direction so as to cover the motor 60 when viewed from outside the exhaust port 12.
  • the base 50 is equipped with, for example, a control board for driving the motor 60.
  • the blower 100 also includes a bearing holder that holds the bearings 16 and 17.
  • the bearing holder is, for example, cylindrical and is supported by the base 50.
  • [Motor] 2 and 4 is disposed inside the cylindrical portion 40, as described above.
  • the motor 60 has a rotor 61 and a stator 62.
  • the stator 62 is disposed radially inwardly of the rotor 61.
  • the rotor 61 is disposed radially outwardly of the stator 62.
  • the rotor 61 has a magnet 61a that is arranged radially outward of the stator 62.
  • the magnet 61a is, for example, cylindrical.
  • the stator 62 is arranged inside the cylindrical portion 40.
  • the stator 62 includes, for example, an iron core and a coil.
  • the stator 62 is fixed to the casing 10.
  • the stator 62 is fixed to the casing 10 via the base 50.
  • the rotor 61 rotates together with the impeller 20.
  • the rotor 61 and the impeller 20 can rotate together with the shaft 15.
  • the moving blades 30 and the fixed blades 70 are arranged radially outward of the magnets 61a of the rotor 61.
  • the Z-axis direction at least a portion of the front side (intake port 11 side) of the magnets 61a is arranged to overlap with the moving blades 30.
  • the front side of the magnets 61a is arranged to overlap with the moving blades 30.
  • at least a portion of the rear side (exhaust port 12 side) of the magnets 61a is arranged to overlap with the fixed blades 70.
  • the rear side of the magnets 61a is arranged to overlap with the fixed blades 70.
  • the multiple fixed blades 70 extend in the radial direction from the inner circumferential surface 121 of the casing 10 toward the outer circumferential surface 42a of the cylindrical portion 40.
  • a length L70 of the multiple fixed blades 70 in the Z-axis direction is longer than a width W70 of the multiple fixed blades 70 along the radial direction.
  • the multiple fixed vanes 70 may be formed in a spiral shape along the circumferential direction of the shaft 15.
  • the fixed vanes 70 may be formed in the Z-axis direction from a position downstream of the step 80 to the rear end of the casing 10.
  • the rear end of the casing 10 may be at the position of the exhaust port 12.
  • the length L70 of the multiple fixed vanes 70 in the Z-axis direction may be the length from the most upstream position of the fixed vanes 70 to the rear end of the casing 10.
  • the radial width W70 of the fixed wing 70 may vary in the Z-axis direction. As described above, the fixed wing 70 connects the base 50 and the second casing 120 in the radial direction. At the rear end of the fixed wing 70, the fixed wing 70 connects the outer peripheral surface of the base 50 and the inner peripheral surface 121 of the second casing 120.
  • the radial width W70 of the fixed wing 70 may be the distance between the tip 70a of the fixed wing 70 and the inner circumferential surface 121 of the second casing 120.
  • the radial width W70 of the fixed wing 70 may be the distance between the outer circumferential surface of the base 50 and the inner circumferential surface 121 of the second casing 120.
  • the length L70 of the fixed wing 70 in the Z-axis direction may be longer than the radial width W70 of the fixed wing 70.
  • the multiple fixed blades 70 protrude radially from the inner circumferential surface 121 of the second casing 120 so as to approach the outer circumferential surface 42a of the portion 42 of the tubular portion 40.
  • the tips 70a of the multiple fixed blades 70 are located inside the outer circumferential surface 41a of the portion 41 and outside the outer circumferential surface 42a of the portion 42.
  • the tips 70a of the fixed blades 70 are located away from the outer circumferential surface 42a of the portion 42 in the radial direction.
  • the tips 70a of the fixed blades 70 are also located downstream of the step 80 in the Z-axis direction.
  • the camber line 37 of the rotor blade 30 is disposed in a position closer to the exhaust port 12 in the Z-axis direction than the chord 38 connecting the leading edge 35 and the trailing edge 36 of the rotor blade 30.
  • the camber line 37 is disposed downstream of the chord 38.
  • the rotor blade 30 rotates around the Z-axis.
  • the rotation direction of the rotor blade 30 is from top to bottom in Fig. 7. In the rotor blade 30, the thicker end is the leading edge 35, and the thinner end is the trailing edge 36.
  • the multiple rotor blades 30 have a convex shape with respect to the rotation direction of the impeller 20.
  • the rotation direction of the impeller 20 may be the circumferential direction of the impeller 20.
  • the convex shape includes a bulging shape.
  • the rotor blades 30 include a shape that bulges in the rotation direction of the impeller 20.
  • the outer peripheral edge 32 of the multiple rotor blades 30 is disposed at a position closer to the intake port 11 than the base end 33 of the rotor blade 30.
  • the outer peripheral edge 32 of the rotor blade 30 is disposed upstream of the base end 33.
  • the outer peripheral edge 32 may be the outer peripheral end of the rotor blade 30 in the radial direction.
  • the base end 33 may be the inner peripheral end of the rotor blade 30 in the radial direction.
  • the maximum outer diameter of the rotor blade 30 is the outer diameter at the outer peripheral edge 32.
  • the outer peripheral edge 32 may be the most downstream position in the Z-axis direction of the outer periphery of the rotor blade 30. The most downstream position is the position closest to the exhaust port 12 in the Z-axis direction.
  • the distance L31 between the moving blade 30 and the fixed blade 70 on the radially outer side is longer than the distance L32 between the moving blade 30 and the fixed blade 70 on the radially inner side.
  • the distance L31 is the distance between the outer peripheral edge 32 of the moving blade 30 and the fixed blade 70 in the Z-axis direction.
  • the distance L32 is the distance between the base end 33 of the moving blade 30 and the fixed blade 70 in the Z-axis direction.
  • the distance L31 on the outer diameter side is, for example, 12% or more, preferably 15% or more of the inner diameter ID12 of the exhaust port 12.
  • the distance L32 on the inner diameter side may be, for example, 6% or more, preferably 8% or more of the inner diameter ID12 of the exhaust port 12.
  • the radial width of the flow passage 131 narrows toward the downstream.
  • the air that flows into the flow path 132 passes through a position corresponding to the step 80 and flows through the flow path 132 between the outer peripheral surface 42a of the portion 42 of the tube portion 40 and the inner peripheral surface 121 of the second casing 120.
  • the flow path 132 is provided with fixed wings 70.
  • the air that flows into the flow path 132 is straightened by the fixed wings 70. Eddies in the air flow are reduced, and the flow along the Z-axis direction is promoted.
  • the air that has been straightened inside the flow path 132 is exhausted to the outside through the exhaust port 12.
  • the air exhausted from the exhaust port 12 is supplied, for example, to the inside of the housing of an electronic device.
  • the air supplied to the inside of the housing cools the inside of the electronic device.
  • the blower 100 of the first embodiment comprises a casing 10 having an intake port 11 and an exhaust port 12, and having a flow path 130 formed therein that connects the intake port 11 to the exhaust port 12, an impeller 20 arranged within the casing 10 and rotatable around an axis, the impeller 20 having a hub portion 21 arranged on the intake port 11 side, moving blades 30 formed in the shape of the hub portion 21, and a cylindrical portion 40 extending from the hub portion 21 to the exhaust port 12 side and forming the flow path 130 between the casing 10, and a plurality of fixed blades 70 extending radially from the inner surface 121 of the casing 10 toward the outer surface 42a of the cylindrical portion 40.
  • the casing 10 includes an expanding portion 115 having an inner circumferential surface 111 whose inner diameter expands from the intake port 11 side toward the exhaust port 12 side.
  • the maximum outer diameter OD30 of the multiple rotor blades 30 is greater than the minimum inner diameter ID13 of the expanded diameter section 115.
  • the position P1 of the minimum inner diameter ID13 of the expanded diameter section 115 is located closer to the intake port 11 in the Z-axis direction than the position of the maximum outer diameter OD30 of the impeller 20.
  • the multiple rotor blades 30 extend from the hub portion 21 toward the intake port 11 in the Z-axis direction.
  • the length L70 of the multiple fixed blades 70 in the Z-axis direction is longer than the width W70 of the multiple fixed blades 70 along the radial direction.
  • Such a blower 100 can ensure air volume while suppressing an increase in noise.
  • the width of the flow path 131 decreases toward the downstream near the intake port 11, so static pressure can be ensured.
  • the length L70 of the fixed blades 70 can be sufficiently ensured in the Z-axis direction, so vortexes in the air flow are reduced. This makes it easier for air to be discharged from the exhaust port 12, and the air volume can be ensured while suppressing the rotation speed of the impeller 20.
  • the rotation speed of the impeller 20, the motor 60, and the shaft 15 can be suppressed, so an increase in noise can be suppressed.
  • the tubular portion 40 has a portion 41 (first portion) and a portion 42 (second portion) connected in the Z-axis direction, the portion 41 being disposed closer to the multiple moving blades 30 in the Z-axis direction, the portion 42 being disposed farther from the multiple moving blades 30 in the Z-axis direction, and the outer diameter OD42 of the portion 42 being smaller than the outer diameter OD41 of the portion 41.
  • the multiple fixed blades 70 protrude radially from the inner peripheral surface 121 of the second casing 120 so as to approach the outer peripheral surface 42a of the portion 42. In the radial direction, the tips 70a of the multiple fixed blades 70 are disposed in a position inside the outer peripheral surface 41a of the portion 41 and outside the outer peripheral surface 42a of the portion 42.
  • the fixed blades 70 are formed radially inward beyond the outer circumferential surface 41a of the portion 41. This allows the fixed blades 70 to be formed in a radial direction corresponding to the full width of the flow path 131. Therefore, the fixed blades 70 can reliably reduce vortexes in the air flow.
  • the blower 100 has improved air discharge performance.
  • a step 80 is formed on the outer peripheral surface of the tubular portion 40, and the portion 41 is disposed closer to the plurality of moving blades 30 than the step 80 in the Z-axis direction, and the portion 42 is disposed farther from the plurality of moving blades 30 than the step 80 in the Z-axis direction.
  • the portion 41 is disposed closer to the intake port 11 than the step 80 in the Z-axis direction.
  • the portion 42 is disposed closer to the exhaust port 12 than the step 80 in the Z-axis direction.
  • the portion 41 of the tubular portion 40 is disposed upstream of the step 80, and the portion 42 of the tubular portion 40 is disposed downstream of the step 80.
  • the fixed blades 70 are formed so as to be close to the outer peripheral surface 42a of such portion 42.
  • the blower 100 also includes a stator 62 arranged radially inward, and a rotor 61 having a magnet 61a arranged radially outward from the stator 62, and the rotor 61, the tube portion 40, and the impeller 20 can rotate as a unit.
  • the blower 100 is an outer rotor type blower in which the rotor 61 is arranged radially outward from the stator 62.
  • the camber line 37 of the rotor blade 30 is positioned in the Z-axis direction closer to the exhaust port 12 than the chord 38 connecting the leading edge 35 and the trailing edge 36 of the rotor blade 30.
  • the rotor blade 30 of the blower 100 may have a negative camber.
  • the static pressure can be increased to increase the air volume, thereby improving the fan efficiency.
  • the multiple rotor blades 30 have a convex shape with respect to the rotation direction of the impeller 20. According to the blower 100 equipped with such rotor blades 30, the static pressure can be increased to increase the air volume, thereby improving the fan efficiency.
  • the outer peripheral edge 32 of the multiple rotor blades 30 is positioned closer to the intake port 11 than the base end 33, which is located on the radially inner side, and in the Z-axis direction, the distance L31 between the multiple rotor blades 30 on the radially outer side and the fixed blades 70 is longer than the distance L32 between the multiple rotor blades 30 on the radially inner side and the fixed blades 70. This makes it possible to suppress a decrease in air volume at high static pressure and reduce noise. With the blower 100, air volume can be ensured at high static pressure.
  • the distance in the Z-axis direction between the bottom end of the outer circumferential edge 32 of the multiple moving blades 30 and the upper end 70b of the fixed blade 70 is longer than the distance L32 between the bottom end of the inner circumferential edge of the multiple moving blades 30 and the upper end 70b of the fixed blade 70.
  • the bottom end of the outer circumferential edge 32 of the moving blade 30 may be the position closest to the fixed blade 70 in the Z-axis direction.
  • the upper end 70b of the fixed blade 70 may be the position closest to the moving blade 30 in the Z-axis direction.
  • the bottom end of the inner circumferential edge of the moving blade 30 may be the position closest to the fixed blade 70 in the Z-axis direction.
  • the outer diameter OD12 of the outer peripheral surface 22 at the rear end 21b, which is the side farther from the intake port 11 of the hub portion 21, is larger than the outer diameter OD11 of the outer peripheral surface 22 at the front end 21a, which is the side closer to the intake port 11.
  • This hub portion 21 allows the width of the upstream flow passage 131 to be narrower toward the downstream. This allows the static pressure to be increased.
  • the inclination angle ⁇ 1 of the outer peripheral surface 22 of the hub portion 21 relative to the shaft 15 is greater than the inclination angle ⁇ 2 of the inner peripheral surface 111 of the enlarged diameter portion 115 of the first casing 110 relative to the shaft 15. This allows the width of the flow passage 131 to be narrowed so as to approach the outer diameter side from the inner diameter side.
  • the casing 10 has a first casing 110 in which an intake port 11 is formed and which houses the impeller 20, and a second casing 120 in which an exhaust port 12 is formed and fixed blades 70 are formed on an inner peripheral surface 121.
  • the casing 10 can be formed by connecting the first casing 110 and the second casing 120. After arranging the impeller 20, the motor 60, and the shaft 15 in predetermined positions, the first casing 110 and the second casing 120 can be connected.
  • the first casing 110 and the second casing 120 include a locking type engaging portion and are connected in the Z-axis direction.
  • the locking type engaging portion includes, for example, a locking claw and a recess with which the locking claw engages.
  • the blower 100 includes a first casing 110 and a second casing 120 that are divided in the Z-axis direction
  • the casing 10 is not limited to a case that includes a first casing 110 and a second casing 120.
  • the blower 100 may include a casing that is divided into multiple parts in the radial or circumferential direction.
  • the shape of the casing 10 is not limited, and it may be formed to form a rectangular parallelepiped or a cylindrical body.
  • the step 80 does not have to be formed on the outer peripheral surface of the tubular portion 40.
  • a recess or a reduced diameter may be formed on the outer peripheral surface of the tubular portion 40.
  • blower 100 equipped with an outer rotor type motor 60 is illustrated, but the motor 60 may also be equipped with an inner rotor type motor in which the rotor is arranged radially inside and the stator is arranged radially outside.
  • the fixed wing 70 has a negative camber, but the fixed wing 70 may have a positive camber.
  • FIG. 9 is a diagram showing the positional relationship in the Z-axis direction between the rotor blades 30 and the fixed blades 70B of the blower according to the first modification.
  • the blower 100 according to the first modification includes the fixed blades 70B instead of the fixed blades 70.
  • the upper end 70b of the fixed blade 70B in the Z-axis direction does not have to be perpendicular to the Z-axis.
  • the upper end 70b may be inclined with respect to the Z-axis.
  • the radially inner end 70c of the upper end 70b is closer to the intake port 11 than the radially outer end 70d of the upper end 70b.
  • the radially outer end 70d of the upper end 70b is closer to the exhaust port 12 than the radially inner end 70c of the upper end 70b.
  • the distance L31B between the rotor blade 30 and the fixed blade 70B on the radially outer side is longer than the distance L32 between the rotor blade 30 and the fixed blade 70B on the radially inner side.
  • Distance L31B is the distance in the Z-axis direction between the outer peripheral edge 32 of the rotor blade 30 and the end 70d of the fixed blade 70B.
  • Distance L32 is the distance in the Z-axis direction between the base end 33 of the rotor blade 30 and the end 70c of the fixed blade 70.
  • FIG. 10 is a diagram showing the positional relationship in the Z-axis direction between the moving blades 30B and the fixed blades 70B of the blower 100 according to the second modification.
  • the blower 100 according to the second modification includes the moving blades 30B instead of the moving blades 30.
  • the blower 100 according to the second modification includes the fixed blades 70B, similar to the blower 100 according to the first modification.
  • the lowest end 30b of the rotor blade 30B in the Z-axis direction may be perpendicular to the Z-axis direction.
  • the base end 33B at the lowest end 30b and the outer circumferential edge 32B at the lowest end 30b may be located at the same position in the Z-axis direction.
  • the distance L31C between the moving blade 30B and the fixed blade 70B on the radially outer side is longer than the distance L32 between the moving blade 30B and the fixed blade 70B on the radially inner side.
  • Distance L31C is the distance in the Z-axis direction between the outer peripheral edge 32B of the moving blade 30B and the end 70d of the fixed blade 70B.
  • Distance L32 is the distance in the Z-axis direction between the base end 33B of the moving blade 30B and the end 70c of the fixed blade 70B.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2024/017212 2023-08-03 2024-05-09 送風機 Pending WO2025027968A1 (ja)

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US18/364,729 US12234836B1 (en) 2023-08-03 2023-08-03 Fan
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US20250043801A1 (en) 2025-02-06
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US12234836B1 (en) 2025-02-25
TW202507158A (zh) 2025-02-16
CN121605249A (zh) 2026-03-03

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