CN212454967U - Axial flow fan - Google Patents
Axial flow fan Download PDFInfo
- Publication number
- CN212454967U CN212454967U CN202020619860.4U CN202020619860U CN212454967U CN 212454967 U CN212454967 U CN 212454967U CN 202020619860 U CN202020619860 U CN 202020619860U CN 212454967 U CN212454967 U CN 212454967U
- Authority
- CN
- China
- Prior art keywords
- axial
- casing
- flow fan
- radially
- housing
- 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.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The utility model provides an axial fan. The axial flow fan comprises: a rotor; an impeller having a rotor blade; a stator covering the rotor from a radially outer side; and a cylindrical housing that covers the stator from the radially outer side. The impeller is arranged at one axial end of the rotor. The housing has: a 1 st housing provided with an opening at one axial side; a stationary blade located on the other side in the axial direction than the rotor blade; and a 2 nd casing connected to the radially outer end portions of the stationary blades. The stationary blades are connected to the radially outer surface of the 1 st casing and extend radially outward. One axial end of the radially inner ends of the stator blades is located at the same axial position as the one axial end of the 1 st casing or at a position axially closer to one axial end of the 1 st casing.
Description
Technical Field
The utility model relates to an axial fan.
Background
In the axial flow fan, a rotor blade of an impeller is rotated by driving of a motor, and an air flow flows from the rotor blade in an axial direction. For example, in the electric motor disclosed in patent document 1, when the motor is operated, the air flow generated by the impeller advances downstream and flows through the frame. The frame has an inner wall of a cylindrical shape and an outer wall surrounding the inner wall. A plurality of diffuser vanes extend between the inner wall and the outer wall.
Patent document 1: japanese patent laid-open publication No. 2017-123771
However, a part of the airflow flowing in the axial direction by the driven blade hits against one axial end of the stationary blade corresponding to the diffuser blade of patent document 1 and is directed radially inward. At this time, the radially inward air flow hits the radially outer surface of the casing corresponding to the inner wall of patent document 1, and may possibly remain there or flow back toward the rotor blades. Such stagnation and backflow may cause disturbance of the airflow sent from the driven blades, and may reduce the air flow rate and air pressure of the axial flow fan, or generate vibration and noise.
SUMMERY OF THE UTILITY MODEL
The object of the utility model is to restrain and touch a part of air current of one side of axial tip of stationary blade and disturb the air current that the driven blade sent out.
The present invention provides an exemplary axial flow fan of a first aspect, comprising: a rotor that is rotatable about a central axis extending in a vertical direction; an impeller provided at one axial end of the rotor and having a rotor blade rotatable together with the rotor; a stator covering the rotor from a radially outer side; and a cylindrical housing that covers the stator from a radially outer side. The housing has: a 1 st housing provided with an opening at one axial side; stationary blades which are positioned on the other axial side of the rotor blades, are connected to the radially outer surface of the 1 st casing, and extend radially outward; and a 2 nd casing connected to a radially outer end portion of the stationary blade. One axial end of the radially inner ends of the stator blades is located at the same axial position as the one axial end of the 1 st casing or at one axial end of the 1 st casing.
An exemplary axial flow fan according to a second aspect of the present invention is the axial flow fan according to the first aspect, wherein an axial side end portion of the stationary blade is located at a position closer to the axial side than an axial side end portion of the 1 st case or located at a position closer to the axial side than the axial side end portion of the 1 st case.
An exemplary axial flow fan according to a third aspect of the present invention is the axial flow fan according to the first or second aspect, wherein a radially inner end portion of the one axial end portion of the stationary blade is smoothly connected to the one axial end portion of the 1 st casing.
The present invention is an axial flow fan according to a fourth exemplary aspect, wherein the casing further includes: a support portion that is connected to a radially inner surface of the 1 st case, extends radially inward, and divides the opening into a plurality of sections; and a cylindrical inner cylinder portion connected to a radial inner end portion of the support portion and extending in an axial direction, wherein an axial one-side end portion of the 1 st housing and an axial one-side end portion of the inner cylinder portion are opposed to each other in the radial direction.
An axial flow fan according to a fifth exemplary aspect of the present invention is the axial flow fan according to the fourth exemplary aspect, wherein the inner cylinder portion has a projection portion that projects radially outward from a radially outer surface of the inner cylinder portion and extends in a circumferential direction, and the projection portion is located closer to the one axial side than an axial side end portion of the 1 st casing.
The present invention is an axial flow fan according to a sixth exemplary aspect, wherein the stator includes: a core back held by a radially inner side surface of the 1 st shell; and a tooth portion extending radially inward from the core back portion, wherein at least a radially outer end portion of the other axial end portion of the inner cylindrical portion is axially opposed to the tooth portion.
An axial flow fan according to a seventh aspect of the present invention is the axial flow fan according to the sixth aspect, wherein the opening overlaps with the tooth portion when viewed in the axial direction.
An exemplary axial flow fan according to an eighth aspect of the present invention is the axial flow fan according to the first or second aspect, wherein the 1 st casing has a truncated cone cylinder portion whose radial outer diameter increases from the one axial side toward the other axial side.
An exemplary axial flow fan according to a ninth aspect of the present invention is the axial flow fan according to the eighth aspect, wherein the 1 st housing further includes a cylindrical portion extending from an end portion of the circular truncated cone cylinder portion on the other axial side to the other axial side and having a constant radial outer diameter, and an end portion of the cylindrical portion on one axial side of the radially outer side surface is smoothly connected to an end portion of the circular truncated cone cylinder portion on the other axial side of the radially outer side surface.
The present invention is characterized in that, in the axial flow fan according to the first or second aspect, the impeller further includes an impeller base covering an axial side end portion of the 1 st casing, and a radially outer end portion of the impeller base is located at the same radial position as a radially outer end portion of the 1 st casing.
An exemplary axial flow fan according to an eleventh aspect of the present invention is the axial flow fan according to the first or second aspect, wherein the number of the openings and the number of the stationary blades are relatively prime.
An exemplary axial flow fan according to a twelfth aspect of the present invention is the axial flow fan according to the first or second aspect, wherein an axial side end portion of the connecting portion between the casing 1 and at least one of the stationary blades overlaps with the opening in a radial direction.
According to the exemplary axial flow fan of the present invention, it is possible to suppress a portion of the airflow that hits the one axial end portion of the stationary blade from disturbing the airflow sent from the driven blade.
Drawings
Fig. 1 is a perspective view of an axial flow fan.
Fig. 2 is a sectional view showing a structural example of the axial flow fan.
Fig. 3 is an axial end view of the axial fan viewed in the other axial direction.
Description of the reference symbols
100: a motor; 1: a rotor; 10: a shaft; 11: a magnet; 12: a counterweight; 2: a stator; 21: a stator core; 211: the back of the iron core; 212: a tooth portion; 2121: an arm portion; s: a groove; 22: an insulating member; 23: a coil section; 3: a housing; 31: 1, a first shell; 31 a: 1 st opening; 311: a barrel portion; 311 a: a truncated cone cylinder part; 311 b: a cylindrical portion; 312: a support portion; 32: a 2 nd housing; 33: a stationary blade; 34: an inner cylinder part; 340: a 1 st bearing; 341: a protrusion portion; 4: a housing cover; 4 a: a 2 nd opening; 40: a 2 nd bearing; 5: a substrate; 200: an impeller; 201: moving blades; 202: an impeller base; 500: an axial flow fan; CA: a central axis; F. fa, Fb: and (4) air flow.
Detailed Description
Hereinafter, exemplary embodiments will be described with reference to the drawings.
In the present specification, the direction parallel to the center axis CA in the axial flow fan 500 and the motor 100 is referred to as an "axial direction". The direction from the casing cover 4 to the impeller 200 described later in the axial direction is referred to as "one axial direction", and the direction from the impeller 200 to the casing cover 4 is referred to as "the other axial direction". In each component, one end in the axial direction is referred to as an "axial one-side end". The other end in the axial direction is referred to as "the other end in the axial direction". In addition, among the surfaces of the respective components, a surface facing one axial direction is referred to as an "axial one-side end surface", and a surface facing the other axial direction is referred to as an "axial other-side end surface".
In addition, a direction perpendicular to the center axis CA is referred to as a "radial direction". A direction approaching the center axis CA in the radial direction is referred to as "radially inner side", and a direction away from the center axis CA is referred to as "radially outer side". In each component, the inner end is referred to as a "radially inner end". The outer end is referred to as a "radially outer end". Among the side surfaces of the respective components, the side surface facing inward is referred to as a "radially inner side surface", and the side surface facing outward is referred to as a "radially outer side surface".
The rotational direction about the center axis CA is referred to as "circumferential direction". In each component, an end in the circumferential direction is referred to as a "circumferential end", and a position of the circumferential end in the circumferential direction is referred to as a "circumferential end". One end in the circumferential direction is referred to as a "circumferential one-side end". The other end in the circumferential direction is referred to as "the other end in the circumferential direction". Among the side surfaces of the respective components, the side surface facing in the circumferential direction is referred to as a "circumferential side surface". One side surface facing in the circumferential direction is referred to as a "circumferential one side surface", and the other side surface facing in the circumferential direction is referred to as a "circumferential other side surface".
In the present specification, the term "annular" includes a shape in which a gap is not formed over the entire circumference of the circumference around the central axis CA and the entire circumference is continuously and integrally connected, and also includes an arc shape in which a gap is formed over a part of the entire circumference around the central axis CA.
The above-described definitions of the direction, position, surface, and "ring" are not strictly applied when the device is incorporated into an actual apparatus.
< 1. embodiment >
Fig. 1 is a perspective view of an axial flow fan 500. Fig. 2 is a sectional view showing a configuration example of the axial flow fan 500. Fig. 3 is an axial end view of the axial fan 500 viewed in the other axial direction. Fig. 2 shows a cross-sectional structure of the axial flow fan 500 when viewed from the circumferential direction, the cross-sectional structure being cut by a virtual plane including the center axis CA. In fig. 3, the impeller 200 is not shown for easy viewing of the drawing.
< 1-1. Structure of axial flow fan
< 1-2. Structure of motor
Next, the structure of the motor 100 will be explained. The motor 100 includes a rotor 1, a stator 2, a housing 3, a housing cover 4, and a substrate 5. In other words, the axial flow fan 500 includes the rotor 1, the stator 2, the casing 3, the casing cover 4, and the base plate 5.
< 1-2-1. rotor >
The rotor 1 is rotatable about a central axis CA extending in the vertical direction. The rotor 1 includes a shaft 10, a magnet 11, and a counterweight 12.
The shaft 10 is a rotation shaft of the rotor 1 and is rotatable about a center axis CA. An impeller base 202 is attached to one axial end of the shaft 10.
In the present embodiment, the magnet 11 has a cylindrical shape extending in the axial direction and is fixed to the radially outer surface of the shaft 10. The magnet 11 is positioned radially inward of the stator 2 and radially faces the radially inner end of the stator 2.
The counter weight 12 is a member for adjusting the rotational balance of the rotor 1. The counter weight 12 is annular around the center axis CA, and in the present embodiment, the counter weight 12 is provided on the radially outer surface of the shaft 10 at one axial side and the other axial side with respect to the magnet 11.
< 1-2-2. stator
The stator 2 drives and rotates the rotor 1. The stator 2 is annular about the center axis CA, and covers the rotor 1 from the radially outer side. The stator 2 includes a stator core 21, an insulator 22, and a plurality of coil portions 23.
The stator core 21 is an annular magnetic body centered on the center axis CA, and in the present embodiment, the stator core 21 is a laminated body in which a plurality of electromagnetic steel plates are laminated in the axial direction. The stator core 21 has a core back 211, teeth 212, and slots S. In other words, the stator 2 includes the core back 211, the tooth 212, and the slot S. The core back 211 is annular about the center axis CA and is held by the radially inner surface of the 1 st case 31. The teeth 212 are plural and arranged in the circumferential direction. Each tooth portion 212 extends radially inward from the core back 211. More specifically, the tooth portion 212 includes: an arm portion 2121 extending radially inward from the core back 211; and a tip portion (not shown) extending from a radially inner end portion of the arm portion 2121 to both sides in the circumferential direction. The slots S are provided between the circumferentially adjacent teeth 212 and penetrate the stator 2 in the axial direction.
The insulator 22 is an insulating member made of, for example, a resin material, and covers at least a part of the stator core 21.
The coil portion 23 is a winding member that winds a conductive wire (not shown) around the stator core 21 with the insulator 22 interposed therebetween. More specifically, in each coil portion 23, the lead is wound around the arm portion 2121 of the tooth portion 212 via the insulator 22. The ends of the wires are connected to the substrate 5.
< 1-2-3. Shell >
Next, the housing 3 is formed in a cylindrical shape extending in the axial direction, and covers the stator 2 from the outside in the radial direction. In the present embodiment, the housing 3 is made of a non-magnetic metal such as aluminum, and accommodates one axial side portion of the stator 2. However, the present invention is not limited to this example, and the housing 3 may be made of resin. The casing 3 includes a 1 st casing 31, a 2 nd casing 32, stationary blades 33, and an inner tube portion 34.
The 1 st housing 31 has a covered cylindrical shape extending in the axial direction, and covers the stator 2 from the radially outer side. A 1 st opening 31a is provided at one side of the 1 st housing 31 in the axial direction. The specific structure of the 1 st case 31 and the 1 st opening 31a will be described later.
The 2 nd housing 32 has a cylindrical shape extending in the axial direction. The 2 nd housing 32 is provided radially outward of the 1 st housing 31. The 2 nd casing 32 is connected to the radially outer end portions of the stationary blades 33.
The stator blades 33 are ribs connecting the radially outer surface of the 1 st casing 31 and the radially inner surface of the 2 nd casing 32. The stationary blade 33 is positioned on the other axial side than the rotor blade 201. The stationary blades 33 are connected to the radially outer surface of the 1 st casing 31 and extend radially outward. That is, the radially inner end portions of the stationary blades 33 are connected to the radially outer surface of the 1 st casing 31. The radially outer end of the stationary blade 33 is connected to the radially inner surface of the 2 nd casing 32.
In the present embodiment, the axial one-side end of the radially inner end of the stationary blade 33 is located at the same axial position as the axial one-side end of the 1 st casing 31, and more specifically, the axial one-side end of the radially inner end of the stationary blade 33 is located at the same axial position as the axial one-side end of the truncated cone cylinder portion 331a described later. However, the present invention is not limited to this example, and the one axial end of the radially inner end of the stationary blade 33 may be positioned on the one axial side of the one axial end of the 1 st casing 31.
Due to the rotation of the impeller 200, a part of the airflow F directed to the other axial side by the driven blade 201 hits the one axial end of the stationary blade 33. By positioning the one axial end of the radially inner end of the stationary blade 33 at the same axial position as the one axial end of the 1 st casing 31 or at a position closer to the one axial end than the one axial end of the 1 st casing 31, it is possible to suppress the flow F in which the one partial flow Fa hitting the one axial end of the stationary blade 33 disturbs the driven blade 201 toward the other axial end. Further, the reduction in the air flow amount and air pressure of the axial fan 500, the generation of vibration and noise, and the like due to the disturbance of the airflow F can be suppressed.
For example, a part of the airflow Fa hitting the one axial end of the stationary blade 33 is separated from the remaining part of the airflow Fb flowing between the 1 st casing 31 and the 2 nd casing 32, and flows radially inward along the one axial end of the stationary blade 33. Here, the one axial end of the radially inner end of the stationary blade 33 is located at the same axial position as the one axial end of the 1 st casing 31 or at one axial position from the one axial end of the 1 st casing, so that the radially inward airflow Fa can smoothly flow between the impeller 200 and the 1 st casing 31 without being obstructed by the radially outer surface of the 1 st casing 31. The airflow Fa can flow into the 1 st casing 31 through the 1 st opening 31a provided at one axial end of the 1 st casing 31 without being retained or flowing backward between the impeller 200 and the 1 st casing 31. Further, since there is no stagnation or backflow as described above, it is possible to prevent the new airflow Fa from hardly flowing between the impeller 200 and the 1 st casing 31. Therefore, the flow F that is sent from the driven blade 201 and flows to the other axial direction can be suppressed from being disturbed by the partial flow Fa that hits the one axial end of the stationary blade 33. Further, the flow of air flowing backward from between the impeller 200 and the 1 st casing 31 can be prevented from disturbing the airflow F flowing in the other axial direction from the driven vane 201.
Further, the stator 2 provided inside the 1 st case 31 can be cooled by the airflow Fa flowing inside the 1 st case 31.
In the present embodiment, the radially outer portion of the one axial end of the stationary blade 33 is positioned on the other axial side than the radially inner end of the 1 st casing 31. However, the present invention is not limited to this example, and all of the axial end portions of the stationary blades 33 may be located at the same axial position as the axial end portion of the 1 st casing 31, and more specifically, the axial end portions of the stationary blades 33 may be located at the same axial position as the axial end portion of the truncated cone cylinder portion 311 a. Alternatively, all the axial end portions of the stationary blades 33 may be positioned on the axial side of the axial end portion of the 1 st casing 31, more specifically, the axial end portions of the stationary blades 33 may be positioned on the axial side of the axial end portion of the truncated cone cylinder portion 311 a. Thus, the airflow Fa hitting the one axial end of the stationary blade 33 more easily flows between the impeller 200 and the 1 st casing 31.
As shown in fig. 2, the radially inner end of the one axial end of the stationary blade 33 is smoothly connected to the 1 st casing 31, and particularly, to the one axial end of the 1 st casing 31. More specifically, one of the axial one-side end surface and the radial inner end surface of the stationary blade 33 is connected to the axial one-side end surface of the 1 st casing 31. At this time, for example, the slope of a tangent line perpendicular to the circumferential direction at the connection portion of the two continuously changes from the one surface of the stationary blade 33 toward the one axial end surface of the 1 st casing 31. In other words, at the connection portion between the first and second casing members, the slope of the tangent line perpendicular to the circumferential direction of the one surface of the stationary blade 33 matches the slope of the tangent line perpendicular to the circumferential direction of the one axial end surface of the 1 st casing 31.
Thus, the airflow Fa that hits against the one axial end of the stationary blade 33 and flows between the impeller 200 and the 1 st casing 31 is less likely to be obstructed by the radially outer surface of the 1 st casing 31. Therefore, the airflow Fa can flow more smoothly between the impeller 200 and the 1 st casing 31.
Next, the inner cylindrical portion 34 supports the 1 st bearing 340 provided at a position radially inward of the 1 st housing 31. The inner tube portion 34 has a tubular shape extending in the axial direction. The inner tube portion 34 is connected to a radially inner end portion of a support portion 312 described later. The 1 st bearing 340 is provided on a radially inner end surface of the inner cylinder portion 34. The inner cylinder portion 34 rotatably supports one axial portion of the shaft 10 via the 1 st bearing 340.
At least a radially outer end portion of the other axial end portion of the inner cylindrical portion 34 is axially opposed to the tooth portion 212 of the stator core 21, that is, axially opposed to the coil portion 23. Thus, the air flow Fa that hits the radially outer surface of the inner cylinder portion 34 and faces the other axial side contacts the coil portion 23 provided in the tooth portion 212. This enables the coil section 23 to be cooled more efficiently.
The inner tube portion 34 has a protrusion 341. The projection 341 projects radially outward from the radially outer surface of the inner cylindrical portion 34 and extends in the circumferential direction. The projection 341 is located on one axial side of the one axial end of the 1 st housing 31, and more specifically, the projection 341 is located on one axial side of the one axial end of the truncated cone cylinder 311 a. The protrusion 341 is preferably located on one axial side of the other axial end of the impeller base 202. Thus, the airflow Fa hitting the radially outer surface of the inner tube portion 34 is less likely to flow in one axial direction due to the projection 341. Therefore, the airflow Fa can be more efficiently guided to the 1 st opening 31 a. Therefore, the disturbance of the airflow F can be suppressed. Further, the projection 341 may be positioned at an axial position overlapping the other axial end of the impeller base 202 when viewed in the radial direction, or may be positioned on the other axial side from the other axial end of the impeller base 202.
< 1-2-3-1. the 1 st shell >)
Next, a specific structure of the 1 st case 31 will be described. The 1 st housing 31 has a cylindrical portion 311, a support portion 312, and a 1 st opening 31 a. In other words, the housing 3 has the cylindrical portion 311, the support portion 312, and the 1 st opening 31 a.
The cylindrical portion 311 has a cylindrical shape extending in the axial direction. The cylindrical portion 311 has a truncated cone cylindrical portion 311a and a cylindrical portion 311 b. In other words, the 1 st housing 31 has a truncated cone cylinder portion 311a and a cylinder portion 311 b.
The truncated cone cylindrical portion 311a has a cylindrical shape extending in the axial direction, and in the present embodiment, the truncated cone cylindrical portion 311a is a portion on one axial side of the 1 st housing 31. The outer shape of the truncated cone cylinder portion 311a is a truncated cone shape. That is, the outer diameter of the truncated cone cylinder portion 311a in the radial direction increases from one axial side to the other axial side. Therefore, the airflow F flowing toward the other axial direction between the 1 st casing 31 and the 2 nd casing 32 is less likely to be disturbed.
The axial end of the truncated cone cylinder portion 311a is radially opposed to the axial end of the inner cylinder portion 34. That is, the axial end of the 1 st housing 31 and the axial end of the inner tube 34 are radially opposed to each other. In this way, the airflow Fa flowing radially inward between the impeller 200 and the 1 st casing 31 hits the radially outer surface of the inner cylindrical portion 34, and the flow direction becomes axial. Thereby, the airflow Fa can be guided to the 1 st opening 31a of the 1 st housing 31.
One axial end of the truncated cone cylinder portion 311a is covered with the impeller base 202. The radially outer end of the circular truncated cone portion 311a is located at the same radial position as the radially outer end of the impeller base 202. In other words, the impeller base 202 covers one axial end of the 1 st casing 31. Further, the radially outer end portion of the impeller base 202 is located at the same radial position as the radially outer end portion of the 1 st housing 31. In this way, the airflow F flowing from the driven vane 201 toward the other axial direction tends to flow more smoothly toward the radially outer surface of the truncated cone portion 311a of the 1 st casing 31 in the vicinity of the radially outer end portion of the impeller base 202. Therefore, the airflow F is less likely to be disturbed at the axial position on the other axial side than the impeller base 202 and on the one axial side than the truncated cone cylindrical portion 311a of the 1 st housing 31.
The cylindrical portion 311b is cylindrical and extends in the axial direction. In the present embodiment, the cylindrical portion 311b is a portion on the other axial side of the 1 st housing 31. The cylindrical portion 311b extends axially to the other side from the other axial end of the truncated cone cylindrical portion 311 a. The outer diameter of the cylindrical portion 311b in the radial direction is constant.
One axial end portion of the radially outer surface of the cylindrical portion 311b is smoothly connected to the other axial end portion of the radially outer surface of the truncated cone cylindrical portion 311 a. The radially outer side surface of the truncated cone cylinder portion 311a is connected to the radially outer side surface of the cylindrical portion 311 b. In other words, the slope of a tangent line perpendicular to the circumferential direction at the connecting portion of the two continuously changes from the circular truncated cone cylinder portion 311a toward the cylinder portion 311 b. Thus, the airflow Fb flowing toward the other axial direction along the radially outer surface of the 1 st housing 31 is less likely to be disturbed in the vicinity of the connection portion between the truncated cone cylinder portion 311a and the cylindrical portion 311 b.
Next, the support portion 312 extends radially inward from one axial end of the truncated cone cylinder portion 311 a. The radially inner end of the support 312 is connected to the cylindrical inner tube 34, and in the present embodiment, the radially inner end of the support 312 is connected to the radially outer surface of the inner tube 34. The support portion 312 is connected to the radially inner surface of the 1 st shell 31 and extends radially inward.
Next, as described above, the 1 st opening 31a is provided on one side in the axial direction of the 1 st housing 31. The 1 st opening 31a allows the axial end of the 1 st housing 31 and the impeller 200 to communicate with the groove S of the stator 2. The 1 st opening 31a is surrounded by the radial inner surface of the cylinder portion 311, the support portion 312, and the radial outer surface of the inner cylinder portion 34. In other words, the 1 st opening 31a is divided into a plurality by the support portion 312.
The number of the 1 st openings 31a and the number of the stationary blades 33 are preferably coprime. In this way, a greater number of combinations of the facing arrangement patterns of the 1 st opening 31a and the stationary blades 33 can be achieved than in the case where both are not mutually homogenous. Therefore, the pattern of turbulence of the airflow Fa caused by the arrangement pattern becomes more, and therefore the pattern of turbulence of the airflow Fa generated in the vicinity of the 1 st opening 31a does not overlap, and interference between them can be reduced.
The 1 st opening 31a overlaps the tooth portion 212 of the stator core 21 when viewed from the axial direction. More specifically, the 1 st opening 31a overlaps the arm portion 2121 of the tooth portion 212. Thus, the air flow Fa flowing into the 1 st opening 31a from between the impeller 200 and the 1 st casing 31 directly contacts the coil portion 23 of the arm portion 2121 wound around the tooth portion 212. This enables the coil unit 23 to be cooled more efficiently by the air flow Fa.
In the present embodiment, one axial end of the connection portion between the 1 st casing 31 and a part of the stationary blades 33 overlaps the 1 st opening 31a in the radial direction. However, the present invention is not limited to this example, and one axial end of the connection portion between the 1 st casing 31 and all the stationary blades 33 may overlap the 1 st opening 31a in the radial direction. That is, the 1 st opening 31a may be radially overlapped with one axial end of the connection portion between the 1 st casing 31 and the at least one stationary blade 33. Thus, the airflow Fa that flows radially inward while hitting the one axial end of the stationary blade 33 can flow more smoothly between the impeller 200 and the 1 st casing 31 without changing the direction in the circumferential direction.
< 1-2-4. housing cover >
In the present embodiment, the housing cover 4 is made of resin, is attached to the other axial end of the 1 st housing 31, and covers the other axial end of the 1 st housing 31. The housing cover 4 accommodates the other axial end of the stator 2. The 2 nd bearing 40 is mounted on the housing cover 4. The housing cover 4 rotatably supports the other axial end of the shaft 10 via a 2 nd bearing 40. Further, the case cover 4 is provided with a 2 nd opening 4 a. The 2 nd opening 4a is fluidly connected to the radially inner side of the 1 st shell 31, in particular, the slot S of the stator 2. The airflow Fa flows into the groove S from between the impeller 200 and the one axial end of the truncated cone cylinder 331a through the 1 st opening 31a, and is sent out from the groove S to the outside of the casing cover 4 through the 2 nd opening 4 a.
< 2. other >)
The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above embodiments. The present invention can be implemented by applying various modifications to the above-described embodiments within a scope not departing from the gist of the present invention. The matters described in the above embodiments can be arbitrarily combined as appropriate within a range not inconsistent with each other.
Industrial applicability
The present invention is useful for an air supply device in which a stationary blade is provided on a casing.
Claims (12)
1. An axial-flow fan, characterized in that,
the axial flow fan comprises:
a rotor that is rotatable about a central axis extending in a vertical direction;
an impeller provided at one axial end of the rotor and having a rotor blade rotatable together with the rotor;
a stator covering the rotor from a radially outer side; and
a cylindrical housing that covers the stator from a radially outer side,
the housing has:
a 1 st housing provided with an opening at one axial side;
stationary blades which are positioned on the other axial side of the rotor blades, are connected to the radially outer surface of the 1 st casing, and extend radially outward; and
a 2 nd casing connected to a radially outer end portion of the stationary blade,
one axial end of the radially inner ends of the stator blades is located at the same axial position as the one axial end of the 1 st casing or at one axial end of the 1 st casing.
2. The axial flow fan according to claim 1,
the one axial end portions of the stator blades are all located at the same axial position as the one axial end portion of the 1 st casing, or are all located on one axial side of the one axial end portion of the 1 st casing.
3. The axial flow fan according to claim 1 or 2,
a radially inner end of the one axial end of the stationary blade is smoothly connected to the one axial end of the 1 st casing.
4. The axial flow fan according to claim 1 or 2,
the housing further has:
a support portion that is connected to a radially inner surface of the 1 st case, extends radially inward, and divides the opening into a plurality of sections; and
a cylindrical inner cylinder portion connected to a radially inner end portion of the support portion and extending in an axial direction,
an axial end of the 1 st housing is radially opposed to an axial end of the inner cylindrical portion.
5. The axial flow fan according to claim 4,
the inner cylinder portion has a projection portion projecting radially outward from a radially outer surface of the inner cylinder portion and extending in a circumferential direction,
the projection is located on one axial side of the 1 st housing from one axial end thereof.
6. The axial flow fan according to claim 4,
the stator has:
a core back held by a radially inner side surface of the 1 st shell; and
a tooth portion extending radially inward from the core back portion,
at least a radially outer end of the other axial end of the inner cylindrical portion is axially opposed to the tooth portion.
7. The axial flow fan according to claim 6,
the opening overlaps with the tooth portion when viewed from the axial direction.
8. The axial flow fan according to claim 1 or 2,
the 1 st housing has a truncated cone cylinder portion whose radial outer diameter increases from one axial side to the other axial side.
9. The axial flow fan according to claim 8,
the first housing 1 further includes a cylindrical portion extending from the other axial end of the truncated cone cylindrical portion to the other axial end and having a constant radial outer diameter,
one axial end portion of the radially outer side surface of the cylindrical portion is smoothly connected to the other axial end portion of the radially outer side surface of the truncated cone cylindrical portion.
10. The axial flow fan according to claim 1 or 2,
the impeller further has an impeller base covering an axial one-side end portion of the 1 st housing,
the radially outer end of the impeller base is located at the same radial position as the radially outer end of the 1 st housing.
11. The axial flow fan according to claim 1 or 2,
the number of the openings and the number of the stationary blades are relatively prime.
12. The axial flow fan according to claim 1 or 2,
an axial one-side end portion of a connecting portion of the 1 st casing and at least one of the stationary blades overlaps the opening in a radial direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-089617 | 2019-05-10 | ||
| JP2019089617A JP2020186653A (en) | 2019-05-10 | 2019-05-10 | Axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212454967U true CN212454967U (en) | 2021-02-02 |
Family
ID=73221557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020619860.4U Active CN212454967U (en) | 2019-05-10 | 2020-04-22 | Axial flow fan |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2020186653A (en) |
| CN (1) | CN212454967U (en) |
-
2019
- 2019-05-10 JP JP2019089617A patent/JP2020186653A/en active Pending
-
2020
- 2020-04-22 CN CN202020619860.4U patent/CN212454967U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020186653A (en) | 2020-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106877556B (en) | Electric machine | |
| US11480196B2 (en) | Axial fan | |
| US4829254A (en) | Electric motor with velocity indicating device | |
| US10465692B2 (en) | Fan motor | |
| JP6507723B2 (en) | Axial fan and fan unit | |
| US20190277309A1 (en) | Centrifugal fan | |
| EP3511575A1 (en) | Air blower and cleaner | |
| US6800972B2 (en) | Generator and fan | |
| CN111379715B (en) | Air supply device | |
| JP6603448B2 (en) | Centrifugal impeller and centrifugal blower | |
| CN104712574A (en) | Axial flow fan and series axial flow fan | |
| JP2005160264A (en) | Blower motor | |
| CN212454967U (en) | Axial flow fan | |
| JP2022189307A (en) | Cooling fan and electric motor assembly | |
| CN109578300B (en) | Centrifugal fan | |
| CN112564370A (en) | Motor and air supply device | |
| TW201401731A (en) | Brushless motor | |
| CN111917241B (en) | Synchronous rotating motor and discharge resistor | |
| CN114135501A (en) | Rotating device | |
| JP7154445B1 (en) | Rotating electric machine | |
| EP3364527B1 (en) | Electric motor and blower | |
| JP7123283B1 (en) | Centrifugal fan and rotary electric machine using centrifugal fan | |
| CN212063691U (en) | Motor and axial flow fan | |
| CN216477924U (en) | Air flow control device | |
| JP7002499B2 (en) | Rotating machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |