Blower

Abstract

A blower according to one embodiment of the present invention is provided with a housing (10), an impeller (20) provided with a hub section (21), a plurality of rotor blades (30), and a cylinder section (40), the housing comprising an expanded-diameter section (115) having an inner peripheral surface with an inner diameter expanding from an intake port (11) side toward an exhaust port (12) side, the maximum outer diameter of the plurality of rotor blades being larger than the minimum inner diameter of the expanded-diameter section, and the rotor blades (30) being provided with a plurality of fixed blades (70). The position of the minimum inner diameter of the expanded-diameter portion is located closer to the suction port side than the position of the maximum outer diameter of the plurality of rotor blades in the axial direction, the plurality of rotor blades protrude from the hub portion toward the suction port in the axial direction, and the length of the plurality of fixed blades in the axial direction is longer than the width of the plurality of fixed blades in the radial direction.

Description

Technical Field

[0001] This invention relates to a blower. Background Technology

[0002] The axial flow fan described in Patent Documents 1-3 includes an impeller with moving blades and a housing that houses the impeller. An intake port and an exhaust port are formed in the housing. Air flowing in from the intake port due to the rotation of the impeller flows through a flow path inside the housing and is discharged from the exhaust port. In the flow path inside the housing, the inner diameter of the portion farther from the intake port is larger than the inner diameter of the portion closer to the intake port. In the impeller disposed inside the housing, the outer diameter of the outer periphery of the moving blades located farther from the intake port is larger than the outer periphery of the moving blades located closer to the intake port.

[0003] <Prior art documents> <Patent Documents> Patent Document 1: Japanese Patent Application Publication No. 2022-35066 Patent Document 2: Japanese Patent Application Publication No. 2021-11867 Patent Document 3: Japanese Patent No. 5945912 Summary of the Invention <Problem to be solved by this invention> As a required performance characteristic of blowers, air volume is a key performance indicator. While increasing the impeller's rotational speed can increase air volume, it may also increase noise levels.

[0004] The purpose of this invention is to provide a blower that can ensure airflow and suppress the increase of noise.

[0005] <Methods for solving problems> One aspect of the present invention relates to a blower comprising a housing, an impeller, and a plurality of fixed blades. The housing has an air intake and an air exhaust, and an internal flow path is formed connecting the air intake to the air exhaust. The impeller is disposed within the housing, is capable of rotating about an axis, and has the following features: The hub portion is located on the air intake side; Multiple moving blades are formed on the hub portion; and The cylindrical portion extends from the hub portion toward the exhaust port side, forming a flow path between it and the housing. The plurality of fixed blades extend radially from the inner circumferential surface of the housing toward the outer circumferential surface of the impeller's cylindrical portion. The housing includes an enlarged diameter portion having an inner circumferential surface whose inner diameter expands from the intake port side toward the exhaust port side. The maximum outer diameter of the plurality of moving blades is greater than the minimum inner diameter of the expanded section. The minimum inner diameter of the expanded section is located axially, closer to the intake port than the maximum outer diameter of the plurality of moving blades. The plurality of moving blades extend axially from the hub toward the air intake. The axial length of the plurality of fixed blades is longer than the radial width of the plurality of fixed blades.

[0006] <The Effects of the Invention> The present invention provides a blower that can ensure air volume and suppress the increase of noise. Attached Figure Description

[0007] Figure 1 This is a perspective view showing the housing of the blower according to the embodiment.

[0008] Figure 2 This is a cross-sectional view along the axial direction of the blower involved in the embodiment.

[0009] Figure 3 It is a cross-sectional view showing the first housing and the impeller in an enlarged form.

[0010] Figure 4 It is a cross-sectional view showing an enlarged portion of the blower.

[0011] Figure 5 This is the front view of the impeller.

[0012] Figure 6 It is a cross-sectional view that enlarges the flow path between the cylinder and the shell.

[0013] Figure 7 This is a cross-sectional view of the moving blade.

[0014] Figure 8 It is a cross-sectional view that enlarges the flow path between the cylinder and the shell, and a diagram showing the positional relationship between the moving blades and the fixed blades.

[0015] Figure 9 This is a diagram showing the positional relationship between the moving blades and the fixed blades of the blower involved in the first modified example along the Z-axis.

[0016] Figure 10 This is a diagram showing the positional relationship between the moving blades and the fixed blades of the blower involved in the second modification example along the Z-axis. Detailed Implementation

[0017] Referring to the accompanying drawings, non-limiting embodiments of the present invention will be described. Furthermore, in the drawings, identical or corresponding components or parts are labeled with identical or corresponding reference numerals. Repeated descriptions of identical or corresponding components or parts are omitted below. Additionally, components or parts in the drawings are not necessarily drawn to scale. Therefore, those skilled in the art can arbitrarily determine specific dimensions by referring to the following non-limiting embodiments. Furthermore, the following embodiments are illustrative and not intended to limit the invention. Moreover, the features and combinations thereof described in the embodiments are not necessarily the essential content of the invention.

[0018] [The blower involved in the implementation method] Figure 1 This is a perspective view showing the housing 10 of the blower 100 according to the embodiment. Figure 2 This is a cross-sectional view along the axial direction of the blower 100 according to the embodiment. Figure 3 This is an enlarged cross-sectional view showing the first housing 110 and the impeller 20. In the drawings, the mutually orthogonal X-axis, Y-axis, and Z-axis directions are sometimes illustrated. The Z-axis direction is the direction in which shaft 15 extends. The X-axis and Y-axis directions are radial. Shaft 15 is an example of a shaft. When simply referred to as "axial," it is the direction in which shaft 15 extends. Furthermore, when simply referred to as "radial," it is the radial direction of shaft 15, which is orthogonal to the axial direction.

[0019] Furthermore, the terms "upper" and "lower" are sometimes used in this specification. In this case, the upper and lower direction refers to the direction in which the shaft 15 extends, with the side closer to the intake port 11 designated as "upper" and the side closer to the exhaust port 12 designated as "lower". However, the actual configuration of the blower 100 may or may not follow this. The shaft 15 may be configured along the upper and lower direction or along the horizontal direction.

[0020] Furthermore, in this instruction manual, the terms "intake port side" and "exhaust port side" are sometimes used. "Intake port side" refers to the side closest to the intake port. "Exhaust port side" refers to the side closest to the exhaust port.

[0021] Figures 1-3 The fan 100 shown is, for example, a fan used for cooling electronic devices such as servers. The fan 100 is mounted on the enclosure of the electronic device and supplies air into the enclosure to cool the electronic device inside. The application of the fan 100 is not limited to cooling electronic devices; it can also be used for other purposes. The fan 100 can blow air. The fan 100 can also blow gases other than air.

[0022] 100 blowers Figure 2As shown, the fan 100 includes a housing 10, a shaft 15, an impeller 20, a base 50, and a motor 60. The fan 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 housing 10. The impeller 20 includes a hub portion 21, a plurality of moving blades 30, and a cylinder portion 40.

[0023] [case] like Figure 1 as well as Figure 2 As shown, an intake port 11 and an exhaust port 12 are formed in the housing 10. The housing 10 has a first housing 110 and a second housing 120. The first housing 110 and the second housing 120 are connected in the Z-axis direction. The intake port 11 is formed in the first housing 110, and the exhaust port 12 is formed in the second housing 120. The intake port 11 and the exhaust port 12 are opposite to each other in the Z-axis direction.

[0024] The shell 10 can also be formed as a cuboid. The shell 10 can also be formed as a cube. The shell 10 can also be formed as a cylinder, or other shapes. Flanges or brackets can also be formed on the shell 10.

[0025] like Figure 2 As shown, a flow path 130 is formed inside the housing 10, extending from the intake port 11 towards the exhaust port 12. The flow path 130 includes a flow path 131 and a flow path 132 that communicate with each other in the Z-axis direction. Flow path 131 communicates with the intake port 11, and flow path 132 communicates with the exhaust port 12. Flow path 132 is a downstream flow path of flow path 131. Furthermore, in the Z-axis direction, the side closer to the intake port 11 is designated as "upstream," and the side closer to the exhaust port 12 is designated as "downstream." Additionally, in the Z-axis direction, the side closer to the intake port 11 is sometimes designated as "front," and the side closer to the exhaust port 12 as "rear," for explanation purposes.

[0026] [First Shell] An air intake 11 is formed in the first housing 110. A flow path 131 is formed inside the first housing 110. A continuous opening in the Z-axis direction is formed in the first housing 110. The inner circumferential surface 111 of the first housing 110 is formed to be circular when viewed in the Z-axis direction. The first housing 110 houses the impeller 20. The first housing 110 houses the portion of the shaft 15 near the air intake 11, the portion of the cylinder 40 near the air intake 11, and the portion of the motor 60 near the air intake 11.

[0027] [Second Shell] An exhaust port 12 is formed in the second housing 120. A flow path 132 is formed inside the second housing 120. A continuous opening in the Z-axis direction is formed in the second housing 120. The inner circumferential surface 121 of the second housing 120 is formed to be circular when viewed in the Z-axis direction. The second housing 120 houses the base 50. The second housing 120 houses the portion of the shaft 15 near the exhaust port 12, the portion of the cylindrical portion 40 near the exhaust port 12, and the portion of the motor 60 near the exhaust port 12.

[0028] [Intake and exhaust ports] Intake port 11 and exhaust port 12 are positioned opposite each other in the Z-axis direction. The inner diameter ID11 of intake port 11 is, for example, smaller than the inner diameter ID12 of exhaust port 12. Intake port 11 may be the most upstream end of flow path 130. Exhaust port 12 may be the most downstream end of flow path 130. The inner diameter ID11 of intake port 11 may be larger than the inner diameter ID12 of exhaust port 12, or it may be the same as the inner diameter ID12 of exhaust port 12. In flow path 130, downstream of intake port 11, a portion with an inner diameter narrower than inner diameter ID11 is formed.

[0029] [Inner circumferential surface of the first shell] The first housing 110 includes an enlarged diameter portion 115. The enlarged diameter portion 115 includes a portion of an inner circumferential surface 111 formed in such a way that the distance from the radial center increases. The radial center is the location of the shaft 15. The radial center may also be located on an extension of the shaft 15.

[0030] The inner diameter of the expanded section 115 is such that the inner diameter of the part farther from the intake port 11 is larger than the inner diameter of the part closer to the intake port 11. For example... Figure 3 As shown, 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 circumferential surface of the enlarged diameter portion 115 at position P1 is smaller than the inner diameter ID14 of the inner circumferential surface 111 of the enlarged diameter portion 115 at position P2.

[0031] The inner diameter ID13 of the inner circumferential surface 111 of the expanded diameter portion 115 at position P1 is the smallest inner diameter among the inner diameters of the inner circumferential surface 111 of the expanded diameter portion 115. The inner diameter ID14 of the inner circumferential surface 111 of the expanded diameter portion 115 at position P2 is the largest inner diameter among the inner circumferential surface 111 of the expanded diameter portion 115. The inner diameter ID13 of the inner circumferential surface of the expanded diameter portion 115 at position P1 is smaller than the inner diameter ID11 of the intake port 11. The inner diameter ID14 of the inner circumferential surface 111 of the expanded diameter portion 115 at position P2 is the same as the inner diameter ID12 of the exhaust port 12. The term "same" includes approximately the same.

[0032] [axis] Figure 4 This is a cross-sectional view showing an enlarged portion of the blower 100. For example... Figure 2 as well as Figure 4 As shown, shaft 15 extends along the Z-axis direction. Shaft 15 is the rotating shaft of motor 60. Shaft 15 is rotatably supported on housing 10. Shaft 15 has end 15a and end 15b. Ends 15a and 15b are the ends of shaft 15 in the length direction. End 15a is disposed near the intake port 11, and end 15b is disposed near the exhaust port 12.

[0033] [Bearings] The blower 100 includes a pair of bearings 16 and 17 that rotatably support the shaft 15. The bearings 16 and 17 are arranged separately in the Z-axis direction. The bearing 16 is arranged near the intake port 11, and the bearing 17 is arranged near the exhaust port 12.

[0034] [impeller] Figure 5 This is the front view of impeller 20. Figure 6 This is a cross-sectional view showing the enlarged flow path 130 between the cylindrical section 40 and the housing 10. Figure 7 This is a cross-sectional view of the moving blade 30. Figure 8 It is a cross-sectional view showing the enlarged flow path 130 between the cylinder 40 and the housing 10, and a diagram showing the positional relationship between the moving blade 30 and the fixed blade 70.

[0035] like Figures 2-4 As shown, the impeller 20, as described above, includes a hub 21, multiple moving blades 30, and a cylinder 40. In a cross-section along the Z-axis, the outer peripheral surface 22 of the hub 21 includes an inclined surface that is inclined relative to the Z-axis direction. The outer diameter of the upstream outer peripheral surface 22 of the impeller 20 is smaller than the outer diameter of the downstream outer peripheral surface 22 of the impeller 20. In other words, the outer diameter of the downstream outer peripheral surface 22 is larger than the outer diameter of the upstream outer peripheral surface 22. Furthermore, in the Z-axis direction, the upstream side is the side closer to the intake port 11, and the downstream side is the side closer to the exhaust port 12.

[0036] A gap is formed in the radial direction of the impeller 20 between the outer peripheral surface 22 of the hub portion 21 and the inner peripheral surface 111 of the first housing 110. The gap between the outer peripheral surface 22 of the impeller 20 and the inner peripheral surface 111 of the first housing 110 forms a flow path 131.

[0037] [Wheel hub] The outer circumferential surface 22 of the hub portion 21 has a larger outer diameter in the Z-axis direction as it moves from upstream to downstream. For example... Figure 3 As shown, the outer diameter OD11 of the outer peripheral surface 22 of the hub portion 21 near the air intake 11 is smaller than the outer diameter OD12 of the outer peripheral surface 22 of the hub portion 21 away from the air intake 11. The outer diameter OD12 is as follows... Figure 6As shown. The outer diameter OD11 of the hub portion 21 can be the outer diameter at the position closest to the intake port 11 in the Z-axis direction. The outer diameter OD11 of the hub portion 21 can also be the minimum outer diameter of the hub portion 21.

[0038] The outer diameter OD11 can be, for example, the outer diameter at the front end 21a of the hub portion 21. The front end 21a of the hub portion 21 is the position closest to the air intake 11 in the Z-axis direction. In the Z-axis direction, the front end 21a of the hub portion 21 is positioned away from the air intake 11. In the Z-axis direction, the position of the outer diameter OD11 is, for example, positioned between position P1 and position P2. In the Z-axis direction, the front end 21a of the hub portion 21 is positioned inside the expanded diameter portion 115 of the first housing 110.

[0039] Figure 6 The outer diameter OD12 shown could 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 the position furthest from the intake port 11 in the Z-axis direction. In the Z-axis direction, the rear end 21b of the hub portion 21 is positioned further away from the intake port 11 than position P2. The rear end 21b of the hub portion 21 can also be positioned outside the expanded diameter portion 115 of the first housing 110 in the Z-axis direction. In the Z-axis direction, the rear end 21b of the hub portion 21 can be positioned downstream of the expanded diameter portion 115, or it can be positioned inside the expanded diameter portion 115. The rear end 21b of the hub portion 21 can also be positioned in the Z-axis direction at the same position as position P2.

[0040] like Figures 2-4 As shown, in the radial direction, the distance between the outer peripheral surface 22 of the hub portion 21 and the inner peripheral surface 111 of the first housing 110 is narrower on the downstream side than on the upstream side. The outer peripheral surface 22 is formed to be close to the inner peripheral surface 111 of the first housing 110 in the radial direction.

[0041] In the radial direction, the width of the flow path 131 is narrower on the downstream side than on the upstream side. In the radial direction, the width of the flow path 131 narrows from upstream to downstream. In the radial direction, the width of the flow path 131 is wider on the upstream side than on the downstream side. The impeller 20 is mounted directly or indirectly to the end 15a of the shaft 15.

[0042] In a cross-section along the Z-axis, the inclination angle θ1 of the outer peripheral surface 22 of the hub portion 21 relative to the Z-axis is, for example, greater than the inclination angle θ2 of the inner peripheral surface of the expanded diameter portion 115 relative to the Z-axis.

[0043] The hub portion 21 has two inclined surfaces with different angles in a cross-section along the Z-axis. The outer peripheral surface 22 of the hub portion 21 includes a first inclined surface 22a and a second inclined surface 22b as the two inclined surfaces. Furthermore, the aforementioned inclination angle θ1 is the inclination angle of the first inclined surface 22a relative to the Z-axis. The inclination angle θ3 of the second inclined surface 22b relative 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 axially overlapping with the magnet 61a of the rotor 61. The magnet 61a is also referred to as the "rotor magnet".

[0044] In the blower 100, the PQ characteristic (static pressure-volume characteristic) can be improved by the fact that the tilt angle θ3 of the second inclined surface 22b relative to the Z-axis is smaller than the tilt angle θ1 of the first inclined surface 22a relative to the Z-axis.

[0045] [Magnetic yoke] The blower 100 has a magnetic yoke 18. The shaft 15 is fixed relative to the magnetic yoke 18. The impeller 20 is fixed to the end 15a of the shaft 15 via the magnetic yoke 18.

[0046] [Moving blades] like Figures 3-5 As shown, a plurality of moving blades 30 extend radially outward from the outer peripheral surface 22 of the hub portion 21. The plurality of moving blades 30 are formed on the hub portion 21. "Formed on the hub portion 21" includes the case where they are formed relative to the hub portion 21.

[0047] The maximum outer diameter OD30 of the plurality of moving blades 30 is greater than the minimum inner diameter ID13 of the expansion portion 115. In other words, the minimum inner diameter ID13 of the expansion portion 115 is smaller than the maximum outer diameter OD30 of the plurality of moving blades 30. The minimum inner diameter ID13 of the expansion portion 115 is, for example, the inner diameter at position P1. When viewed along the Z-axis, the inner circumferential surface 111 of the expansion portion 115 at position P1 is located radially inward of position P30, which is closer to the position of the maximum outer diameter OD of the moving blades 30. The position P30 of the maximum outer diameter OD30 of the moving blades 30 is the position furthest from the shaft 15 radially. In addition, the maximum outer diameter OD30 of the moving blades 30 is as follows: Figure 5 as well as Figure 8 As shown.

[0048] The position P1 of the smallest inner diameter ID13 of the expansion section 115, in the Z-axis direction, is closer to the intake port 11 than the position P30 of the largest outer diameter OD30 of the moving blade 30 of the impeller 20. In other words, the position P30 of the largest outer diameter OD of the moving blade 30, in the Z-axis direction, is located downstream of the position P1 of the smallest inner diameter ID13 of the expansion section 115. The largest outer diameter OD30 of the moving blade 30 is smaller than the inner diameter ID14 at position P2 of the expansion section 115.

[0049] Multiple moving blades 30 extend from the hub portion 21 toward the intake port 11 in the Z-axis direction. The multiple moving blades 30 extend upstream of the front end 21a of the hub portion 21 in the Z-axis direction. The front end 31 of the multiple moving blades 30 in the Z-axis direction is positioned downstream of the position P1 of the smallest inner diameter ID13 of the expanded diameter portion 115. The front end 31 of the moving blades 30 is positioned inside the expanded diameter portion 115 in the Z-axis direction. The outer diameter of the front end 31 of the multiple moving blades 30 is smaller than the largest outer diameter OD30.

[0050] [Cylinder section] like Figure 2 , Figure 4 as well as Figure 6 As shown, the cylindrical portion 40 is formed to be continuous with the rear end 21b of the hub portion 21 of the impeller 20. The outer peripheral surface of the cylindrical portion 40 is formed to be continuous with the outer peripheral surface of the rear end 21b of the hub portion 21. The cylindrical portion 40 is positioned closer to the exhaust port 12 than the hub portion 21 in the Z-axis direction. The cylindrical portion 40 has a portion 41 and a portion 42. Portion 41 is an example of a first portion of the cylindrical portion 40. Portion 42 is an example of a second portion of the cylindrical portion 40. The cylindrical portion 40 extends from the hub portion 21 toward the exhaust port 12. The cylindrical portion 40 forms a flow path 130 between itself and the housing 10.

[0051] Parts 41 and 42 are connected in the Z-axis direction. Parts 41 and 42 are integrally formed. In the radial direction, inside the cylinder 40, the shaft 15 and the motor 60 are arranged. Part 41 is positioned closer to the plurality of moving blades 30 in the Z-axis direction than part 42. Part 42 is positioned further away from the plurality of moving blades 30 in the Z-axis direction than part 41.

[0052] like Figure 4 as well as Figure 6 As shown, a flow path 130 is formed radially between the outer peripheral surface of the cylindrical portion 40 and the inner peripheral surfaces 111 and 121 of the housing 10. A portion 41 is disposed inside the first housing 110. A portion downstream of portion 41 may also be disposed inside the second housing 120. A portion 42 is disposed inside the second housing 120.

[0053] The upstream flow path 131 of the flow path 130 includes a flow path between the outer peripheral surface of portion 41 of the cylindrical portion 40 and the inner peripheral surface 111 of the first housing 110. The downstream flow path 132 of the flow path 130 includes a flow path between the outer peripheral surface of portion 41 and the inner peripheral surface 121 of the second housing 120. The downstream flow path 132 includes a flow path between the outer peripheral surface of portion 42 and the inner peripheral surface 121 of the second housing 120. As described above, flow path 131 is a flow path inside the first housing 110, and flow path 132 is a flow path inside the second housing 120.

[0054] like Figure 6 As shown, the outer diameter OD41 of the outer peripheral surface of part 41 is different from the outer diameter OD42 of the outer peripheral surface of part 42. The outer diameter OD42 of part 42 is smaller than the outer diameter OD41 of part 41. A step 80 is formed on the outer peripheral surface of the cylinder 40. A step 80 is formed between the outer peripheral surfaces of part 41 and part 42. The positional relationship between the step 80 and the fixed blade 70 will be described later.

[0055] [Base] Figure 2 The base 50 shown is disposed inside the second housing 120. The base 50 is positioned near the exhaust port 12 in the Z-axis direction. A portion of the base 50 may also be disposed at the exhaust port 12.

[0056] The base 50 supports the motor 60 and the shaft 15. The base 50 is fixed to the second housing 120, for example, via a fixing blade 70. Viewed from the outside of the exhaust port 12 in the Z-axis direction, the base 50 is configured to cover the motor 60. The base 50, for example, carries a control base plate for driving the motor 60.

[0057] In addition, the blower 100 includes a bearing retainer for holding the bearings 16 and 17. The bearing retainer is, for example, cylindrical and supported on the base 50.

[0058] [Electric motor] Figure 2 as well as Figure 4 The electric motor 60 shown is disposed inside the cylindrical portion 40 as described above. The electric motor 60 has a rotor 61 and a stator 62. The stator 62 is disposed radially inward of the rotor 61. The rotor 61 is disposed radially inward of the stator 62.

[0059] The rotor 61 has a magnet 61a arranged radially outward from the stator 62. The magnet 61a is, for example, cylindrical. The stator 62 is disposed inside the cylindrical portion 40. The stator 62 includes, for example, an iron core and coils. The stator 62 is fixed relative to the housing 10. The stator 62 is fixed to the housing 10 via a base 50.

[0060] The rotor 61 and impeller 20 rotate as a single unit. The rotor 61 and impeller 20 can rotate together with the shaft 15.

[0061] In addition, such as Figure 6 As shown, a moving blade 30 and a fixed blade 70 are arranged radially outward of the magnet 61a of the rotor 61. In the Z-axis direction, at least a portion of the front side (intake port 11 side) of the magnet 61a is configured to overlap with the moving blade 30. In other words, when viewed radially, the front side of the magnet 61a is configured to overlap with the moving blade 30. In the Z-axis direction, at least a portion of the rear side (exhaust port 12 side) of the magnet 61a is configured to overlap with the fixed blade 70. In other words, when viewed radially, the rear side of the magnet 61a is configured to overlap with the fixed blade 70.

[0062] [Fixed blades] Multiple fixed blades, 70, etc. Figure 2 as well as Figure 6 As shown, in the radial direction, it extends from the inner peripheral surface 121 of the housing 10 toward the outer peripheral surface 42a of the cylindrical portion 40. The length L70 of the plurality of fixed blades 70 in the Z-axis direction is longer than the radial width W70 of the plurality of fixed blades 70.

[0063] The multiple fixed blades 70 can also be formed in a spiral shape along the circumference of the shaft 15. The fixed blades 70 can also be formed in the Z-axis direction from a position downstream of the step 80 to the rear end of the housing 10. The rear end of the housing 10 can also be the position of the exhaust port 12. The length L70 of the multiple fixed blades 70 in the Z-axis direction can also be the length from the upstream position of the fixed blades 70 to the rear end of the housing 10.

[0064] The radial width W70 of the fixed blade 70 can also be different in the Z-axis direction. As described above, the fixed blade 70 connects the base 50 to the second housing 120 in the radial direction. At the rear end of the fixed blade 70, the fixed blade 70 connects the outer peripheral surface of the base 50 to the inner peripheral surface 121 of the second housing 120.

[0065] The radial width W70 of the fixed blade 70 can also be the distance between the front end 70a of the fixed blade 70 and the inner circumferential surface 121 of the second housing 120. Alternatively, the radial width W70 of the fixed blade 70 can also be the distance between the outer circumferential surface of the base 50 and the inner circumferential surface 121 of the second housing 120. The length L70 of the fixed blade 70 in the Z-axis direction can be longer than the radial width W70 of the fixed blade 70.

[0066] like Figure 6As shown, a plurality of fixed blades 70 extend radially from the inner circumferential surface 121 of the second housing 120 toward the outer circumferential surface 42a of the portion 42 of the cylinder 40. Radially, the front ends 70a of the plurality of fixed blades 70 are positioned inward of the outer circumferential surface 41a of the portion 41 and outward of the outer circumferential surface 42a of the portion 42. Radially, the front ends 70a of the fixed blades 70 are separated from the outer circumferential surface 42a of the portion 42. Furthermore, in the Z-axis direction, the front ends 70a of the fixed blades 70 are positioned downstream of the step 80.

[0067] [The positional relationship between the mid-curve of the moving blade and the blade chord] Next, the positional relationship between the mid-arc line 37 and the blade chord 38 of the moving blade 30 will be explained. In the Z-axis direction, the mid-arc line 37 of the moving blade 30 is positioned closer to the exhaust port 12 than the blade chord 38 that connects the leading edge 35 and trailing edge 36 of the moving blade 30. In other words, the mid-arc line 37 is positioned downstream of the blade chord 38. The moving blade 30 rotates about the Z-axis. The direction of rotation of the moving blade 30 is... Figure 7 The middle section is from top to bottom. In the moving blade 30, the thicker side is the leading edge 35, and the thinner side is the trailing edge 36.

[0068] The multiple moving blades 30 are convex in shape relative to the rotation direction of the impeller 20. The rotation direction of the impeller 20 can also be circumferential. The convex shape includes an expanded shape. For example, in a cross-section orthogonal to the shaft 15, the moving blades 30 include an expanded shape in the rotation direction of the impeller 20.

[0069] [Positional relationship between multiple moving blades and fixed blades] Next, the positional relationship between the multiple moving blades 30 and the fixed blades 70 will be explained. For example... Figure 8 As shown, the outer periphery 32 of the plurality of moving blades 30 is positioned closer to the intake port 11 than the base end 33 of the moving blades 30. In other words, the outer periphery 32 of the moving blades 30 is positioned upstream of the base end 33. The outer periphery 32 can be the radially outer circumferential end of the moving blades 30. The base end 33 can be the radially inner circumferential end of the moving blades 30. The maximum outer diameter of the moving blades 30 is the outer diameter at the outer periphery 32. The outer periphery 32 can be the downstream position in the Z-axis direction of the outer periphery of the moving blades 30. The downstream position is the position closest to the exhaust port 12 in the Z-axis direction.

[0070] In the Z-axis direction, the distance L31 between the radially outer moving blade 30 and the fixed blade 70 is longer than the distance L32 between the radially inner moving blade 30 and the fixed blade 70. Distance L31 is the distance between the outer periphery 32 of the moving blade 30 and the fixed blade 70 in the Z-axis direction. 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, at least 12%, preferably at least 15%, of the inner diameter ID12 of the exhaust port 12. The distance L32 on the inner diameter side can, for example, be at least 6%, preferably at least 8%, of the inner diameter ID12 of the exhaust port 12.

[0071] [action] Next, the operation of the blower 100 will be explained. Driven by the motor 60, the rotor 61, impeller 20, and shaft 15 rotate as a single unit. The rotation of the impeller 20 causes multiple moving blades 30 to rotate. As the multiple moving blades 30 rotate, air flows from the intake port 11 into the flow path 130. The air inside the flow path 130 flows from the intake port 11 towards the exhaust port 12.

[0072] Air flowing in from the intake port 11 flows within the flow path 131 between the outer peripheral surface 22 of the hub portion 21 and the inner peripheral surface 111 of the expansion portion 115. In the expansion portion 115, the radial width of the flow path 131 narrows as it moves downstream.

[0073] Air flowing through the flow path 131 between the hub portion 21 and the expansion portion 115 flows within the flow path 131 between the outer peripheral surface 41a of the portion 41 of the cylinder portion 40 and the inner peripheral surface 111 of the first housing 110.

[0074] Air flowing through flow path 131 of the first housing 110 flows in flow path 132 of the second housing 120. Air flowing into flow path 132 passes through the position corresponding to step 80 and flows in flow path 132 between the outer peripheral surface 42a of portion 42 of cylinder 40 and the inner peripheral surface 121 of second housing 120.

[0075] In flow path 132, fixed blades 70 are provided. Air flowing into flow path 132 is rectified by fixed blades 70. Vortexes in the airflow are reduced, and flow along the Z-axis is promoted. The rectified air inside flow path 132 is discharged to the outside through exhaust port 12. The air discharged from exhaust port 12 is supplied, for example, to the interior of the electronic device's housing. The air supplied to the interior of the housing cools the interior of the electronic device.

[0076] [Effects] The blower 100 according to the first embodiment includes: a housing 10 having an air intake 11 and an exhaust 12, and having a flow path 130 formed inside the housing 10 communicating from the air intake 11 to the exhaust 12; an impeller 20 disposed in the housing 10 and capable of rotating about an axis, having a hub portion 21 disposed on the side of the air intake 11, moving blades 30 formed in the shape of the hub portion 21, and a cylindrical portion 40 extending from the hub portion 21 toward the exhaust 12 and forming the flow path 130 between the impeller and the housing 10; and a plurality of fixed blades 70 extending radially from the inner peripheral surface 121 of the housing 10 toward the outer peripheral surface 42a of the cylindrical portion 40.

[0077] The housing 10 includes an enlarged diameter portion 115 having an inner circumferential surface 111 whose inner diameter expands from the intake port 11 side toward the exhaust port 12 side.

[0078] The maximum outer diameter OD30 of the multiple moving blades 30 is greater than the minimum inner diameter ID13 of the expansion section 115. The position P1 of the minimum inner diameter ID13 of the expansion section 115 is in the Z-axis direction, located on the side closer to the intake port 11 than the position of the maximum outer diameter OD30 of the impeller 20.

[0079] Multiple moving blades 30 extend from the hub 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 radial width W70 of the multiple fixed blades 70.

[0080] According to this type of blower 100, airflow can be ensured and noise increase can be suppressed. In the blower 100, the width of the flow path 131 decreases towards the downstream direction near the intake port 11, thus ensuring static pressure. In the blower 100, the length L70 of the fixed blade 70 can be sufficiently ensured in the Z-axis direction, thus reducing airflow turbulence. As a result, air can be easily discharged from the exhaust port 12, ensuring airflow while suppressing the rotational speed of the impeller 20. In the blower 100, since the rotational speeds of the impeller 20, the motor 60, and the shaft 15 can be suppressed, noise increase can be suppressed.

[0081] Furthermore, in the blower 100, the cylinder portion 40 has a portion 41 (first part) and a portion 42 (second part) connected in the Z-axis direction. Part 41 is positioned close to the plurality of moving blades 30 in the Z-axis direction, while part 42 is positioned away from the plurality of moving blades 30 in the Z-axis direction. The outer diameter OD42 of part 42 is smaller than the outer diameter OD41 of part 41. The plurality of fixed blades 70 extend radially from the inner circumferential surface 121 of the second housing 120 toward the outer circumferential surface 42a of part 42. Radially, the front ends 70a of the plurality of fixed blades 70 are positioned further inward than the outer circumferential surface 41a of part 41 and further outward than the outer circumferential surface 42a of part 42.

[0082] According to this type of blower 100, the fixed blades 70 can be formed radially further inward than the outer peripheral surface 41a of the portion 41. Thus, the fixed blades 70 are formed radially corresponding to the full width of the flow path 131. Therefore, the fixed blades 70 reliably reduce airflow turbulence. In the blower 100, air exhaust performance is improved.

[0083] Furthermore, in the blower 100, a step 80 is formed on the outer peripheral surface of the cylinder 40. A portion 41 is positioned in the Z-axis direction closer to the plurality of moving blades 30 than the step 80, while a portion 42 is positioned in the Z-axis direction further away from the plurality of moving blades 30 than the step 80. The portion 41 is positioned in the Z-axis direction closer to the intake port 11 than the step 80. The portion 42 is positioned in the Z-axis direction closer to the exhaust port 12 than the step 80. In the blower 100, the portion 41 of the cylinder 40 is positioned upstream of the step 80, and the portion 42 of the cylinder 40 is positioned downstream of the step 80. In the blower 100, fixed blades 70 are formed close to the outer peripheral surface 42a of such portions 42.

[0084] Furthermore, the blower 100 includes a stator 62 arranged radially inward and a rotor 61 with magnets 61a arranged radially outward from the stator 62. The rotor 61, the cylinder 40, and the impeller 20 can rotate as a single unit. The blower 100 is an external rotor type blower with the rotor 61 arranged radially outward from the stator 62.

[0085] Furthermore, in the blower 100, the mid-arc line 37 of the moving blade 30 is positioned closer to the exhaust port 12 in the Z-axis direction than the blade chord 38 connecting the leading edge 35 and the trailing edge 36 of the moving blade 30. The moving blade 30 of the blower 100 can also have a negative outward tilt angle. By having the moving blade 30 with a negative outward tilt angle, the static pressure can be increased, thereby increasing the air volume and thus improving the blower efficiency. Multiple moving blades 30 are convex in shape relative to the rotation direction of the impeller 20. With a blower 100 equipped with such moving blades 30, the static pressure can be increased, thereby increasing the air volume and thus improving the blower efficiency.

[0086] Furthermore, in the blower 100, the outer periphery 32 of the plurality of moving blades 30 is positioned closer to the intake port 11 than the radially inner position, i.e., the base end 33. In the Z-axis direction, the distance L31 between the radially outer moving blades 30 and the fixed blade 70 is longer than the distance L32 between the radially inner moving blades 30 and the fixed blade 70. This suppresses the reduction in airflow under high static pressure and reduces noise. In the blower 100, airflow is ensured even under high static pressure.

[0087] Furthermore, in the blower 100, in the Z-axis direction, the distance between the lowest point of the outer periphery 32 of the plurality of moving blades 30 and the upper end 70b of the fixed blade 70 is longer than the distance L32 between the lowest point of the inner periphery of the plurality of moving blades 30 and the upper end 70b of the fixed blade 70. The lowest point of the outer periphery 32 of the moving blade 30 can be the position closest to the fixed blade 70 in the Z-axis direction. The upper end 70b of the fixed blade 70 can be the position closest to the moving blade 30 in the Z-axis direction. The lowest point of the inner periphery of the moving blade 30 can be the position closest to the fixed blade 70 in the Z-axis direction.

[0088] Furthermore, in the blower 100, the outer diameter OD12 of the outer peripheral surface 22 of the hub portion 21, located at the rear end 21b away from the intake port 11, is larger than the outer diameter OD11 of the outer peripheral surface 22 located at the front end 21a near the intake port 11. This hub portion 21 allows the width of the upstream flow path 131 to narrow as it moves downstream. This, in turn, increases the static pressure.

[0089] Furthermore, in the blower 100, in a cross-section along the Z-axis direction, the inclination angle θ1 of the outer peripheral surface 22 of the hub portion 21 relative to the shaft 15 is greater than the inclination angle θ2 of the inner peripheral surface 111 of the expanded diameter portion 115 of the first housing 110 relative to the shaft 15. As a result, the width of the flow path 131 can be narrowed in a manner that approaches from the inner diameter side to the outer diameter side.

[0090] Furthermore, in the blower 100, the housing 10 includes: a first housing 110 having an intake port 11 and housing the impeller 20; and a second housing 120 having an exhaust port 12 and fixed blades 70 formed on its inner circumferential surface 121. In such a blower 100, the first housing 110 and the second housing 120 can be connected to form the housing 10. The first housing 110 and the second housing 120 can be connected after the impeller 20, the motor 60, and the shaft 15 are positioned in a given position. The first housing 110 and the second housing 120 include a locking engagement portion connected in the Z-axis direction. The locking engagement portion includes, for example, a locking pawl and a recess for engaging the locking pawl.

[0091] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Various modifications and substitutions can be applied to the above embodiments without departing from the scope of the present invention. Furthermore, features described separately can be combined as long as they do not create technical contradictions.

[0092] In the described blower 100, the case of having a first housing 110 and a second housing 120 divided in the Z-axis direction has been explained, but the housing 10 is not limited to the housing having the first housing 110 and the second housing 120. For example, the blower 100 may also have multiple housings divided in the radial or circumferential direction. Furthermore, the shape of the housing 10 is not limited, and it may be formed as a cuboid or a cylinder.

[0093] Furthermore, the step 80 may not be formed on the outer peripheral surface of the cylinder portion 40. A recess or a reduced diameter may also be formed on the outer peripheral surface of the cylinder portion 40. With this structure, the front end 70a of the fixed blade 70 can be positioned radially inward from the largest outer diameter portion of the cylinder portion 40.

[0094] In the above embodiments, a blower 100 having an external rotor type motor 60 is illustrated, but the motor 60 may also be an internal rotor type motor with the rotor arranged radially inward and the stator arranged radially outward.

[0095] In the above embodiment, the case where the fixed blade 70 has a negative outward tilt angle was illustrated, but the fixed blade 70 can also have a positive outward tilt angle.

[0096] [First Variation] The blower 100 involved in the first modification will be described next. Figure 9 This is a diagram showing the positional relationship of the moving blade 30 and the fixed blade 70B of the blower according to the first modification example in the Z-axis direction. The blower 100 according to the first modification example has fixed blade 70B instead of fixed blade 70.

[0097] like Figure 9 As shown, the upper end 70b of the fixed blade 70B in the Z-axis direction may not be orthogonal to the Z-axis. The upper end 70b may be inclined relative to the Z-axis. The radially inner end 70c of the upper end 70b is located closer to the intake port 11 than the radially outer end 70d of the upper end 70b. In other words, the radially outer end 70d of the upper end 70b is located closer to the exhaust port 12 than the radially inner end 70c of the upper end 70b.

[0098] In the Z-axis direction, the distance L31B between the radially outer moving blade 30 and the fixed blade 70B is longer than the distance L32 between the radially inner moving blade 30 and the fixed blade 70B. Distance L31B is the distance in the Z-axis direction between the outer periphery 32 of the moving blade 30 and the end point 70d of the fixed blade 70B. Distance L32 is the distance in the Z-axis direction between the base end point 33 of the moving blade 30 and the end point 70c of the fixed blade 70.

[0099] [Second Variation] The blower 100 involved in the second modification will be described next. Figure 10 This diagram shows the positional relationship of the moving blade 30B and the fixed blade 70B of the blower 100 according to the second modification in the Z-axis direction. The blower 100 according to the second modification has the moving blade 30B instead of the moving blade 30. The blower 100 according to the second modification, like the blower 100 according to the first modification, also has the fixed blade 70B.

[0100] like Figure 10 As shown, the lowest point 30b of the moving blade 30B in the Z-axis direction can be orthogonal to the Z-axis direction. The base end 33B of the lowest point 30b and the outer periphery 32B of the lowest point 30b can be arranged at the same position in the Z-axis direction.

[0101] In the Z-axis direction, the distance L31C between the radially outer moving blade 30B and the fixed blade 70B is longer than the distance L32 between the radially inner moving blade 30B and the fixed blade 70B. Distance L31C is the distance in the Z-axis direction between the outer periphery 32B of the moving blade 30B and the end point 70d of the fixed blade 70B. Distance L32 is the distance in the Z-axis direction between the base end point 33B of the moving blade 30B and the end point 70c of the fixed blade 70B.

[0102] This application claims priority based on US Patent Application No. 18 / 364729, filed on August 3, 2023, the entire contents of which are incorporated herein by reference.

[0103] Label Explanation 100: Blower; 10: Casing; 11: Inlet; 12: Outlet; 15: Shaft; 20: Impeller; 21: Hub; 22: Outer circumferential surface; 22a: First inclined surface; 22b: Second inclined surface; 30, 30B: Moving blades; 30b: Lowermost end; 35: Leading edge; 36: Trailing edge; 37: Mid-curve; 38: Blade chord; 40: Cylinder; 41: Section (Part 1); 41a : Outer peripheral surface (outer peripheral surface of part 1); 42: Part (part 2); 42a: Outer peripheral surface (outer peripheral surface of part 2); 60: Motor; 61: Rotor; 62: Stator; 70, 70B: Fixed blades; 70a: Front end; 70b: Upper end; 80: Step; 115: Expanded diameter section; 110: First housing; 120: Second housing; 130: Flow path; ID13: End of expanded diameter section Small inner diameter; L31, L31B, L31C: Distance (distance between moving blade and fixed blade); L32: Distance (distance between moving blade and fixed blade); L70: Axial length of fixed blade; OD11: Outer diameter (outer diameter of hub); OD12: Outer diameter (outer diameter of hub); OD30: Maximum outer diameter of moving blade; OD41: Outer diameter (outer diameter of the first part of the cylinder); OD42: Outer diameter (outer diameter of the second part of the cylinder); W70: Radial width of fixed blade; θ1: Inclination angle (inclination angle of the outer circumferential surface of hub, inclination angle of the first inclined surface); θ2: Inclination angle (inclination angle of the inner circumferential surface of shell); θ3: Inclination angle (inclination angle of the second inclined surface); X: X-axis direction (radial); Y: Y-axis direction (radial); Z: Z-axis direction (axial).

Claims

1. A blower comprising a casing, an impeller, and multiple fixed blades, The housing has an air intake and an air exhaust, and an internal flow path is formed connecting the air intake to the air exhaust. The impeller is disposed within the housing, is capable of rotating about an axis, and has the following features: The hub portion is located on the air intake side; Multiple moving blades are formed on the hub portion; and The cylindrical portion extends from the hub portion toward the exhaust port side, forming a flow path between it and the housing. The plurality of fixed blades extend radially from the inner circumferential surface of the housing toward the outer circumferential surface of the impeller's cylindrical portion. The housing includes an enlarged diameter portion having an inner circumferential surface whose inner diameter expands from the intake port side toward the exhaust port side. The maximum outer diameter of the plurality of moving blades is greater than the minimum inner diameter of the expanded section. The minimum inner diameter of the expanded section is located axially, closer to the intake port than the maximum outer diameter of the plurality of moving blades. The plurality of moving blades extend axially from the hub toward the air intake. The axial length of the plurality of fixed blades is longer than the radial width of the plurality of fixed blades.

2. The blower according to claim 1, wherein, The cylindrical portion has a first portion and a second portion connected in the axial direction. The first part is positioned axially on the intake port side. The second part is positioned axially closer to the exhaust port side than the first part. The outer diameter of the second part is smaller than the outer diameter of the first part. The plurality of fixed blades extend radially, approaching from the inner circumferential surface of the housing towards the outer circumferential surface of the second portion. In the radial direction, the front ends of the plurality of fixed blades are positioned inside the outer peripheral surface of the first part and outside the outer peripheral surface of the second part.

3. The blower according to claim 2, wherein, A step is formed on the outer peripheral surface of the cylindrical portion. The first part is positioned axially along the side closer to the air intake than the step. The second part is positioned axially on the side closer to the exhaust port than the step.

4. The blower according to any one of claims 1 to 3, comprising: Stator, disposed on the inner side in the radial direction; and The rotor has magnets arranged radially outward from the stator. The rotor and the impeller can rotate as a single unit.

5. The blower according to any one of claims 1 to 4, wherein, The plurality of moving blades are convex in shape relative to the rotation direction of the impeller.

6. The blower according to any one of claims 1 to 5, wherein, In the axial direction, the distance between the lowest point of the outer periphery of the plurality of moving blades and the upper point of the fixed blade is longer than the distance between the lowest point of the inner periphery of the plurality of moving blades and the upper point of the fixed blade.

7. The blower according to any one of claims 1 to 6, wherein, The outer diameter of the outer peripheral surface of the hub near the exhaust port is larger than the outer diameter of the outer peripheral surface near the intake port.

8. The blower according to claim 7, wherein, In the cross-section along the said axis, The angle of inclination of the outer peripheral surface of the hub relative to the axial direction is greater than the angle of inclination of the inner peripheral surface of the housing relative to the axial direction.

9. The blower according to any one of claims 1 to 8, wherein, The housing has: A first housing, which houses the impeller; and The second housing has the fixed blades formed on its inner circumferential surface.

10. The blower according to any one of claims 1 to 9, wherein, The outer peripheral surface of the hub portion has a first inclined surface and a second inclined surface that are inclined at different angles relative to the axis in a cross section along the axial direction.

11. The blower according to claim 10, comprising: Stator, disposed on the inner side in the radial direction; and The rotor has magnets arranged radially outward from the stator. The second inclined surface is positioned in the axial direction at a position overlapping the magnet.

12. The blower according to claim 10 or 11, wherein, The second inclined surface is positioned along the axial direction closer to the exhaust port than the first inclined surface. The tilt angle of the second inclined surface relative to the axis is smaller than the tilt angle of the first inclined surface relative to the axis.

13. The blower according to claim 4, wherein, In the axial direction, at least a portion of the intake side of the magnet is configured to overlap with the moving blade, and at least a portion of the exhaust side of the magnet is configured to overlap with the fixed blade.

Images